Chemistry Chapter 2 & 3 – Flashcards
Unlock all answers in this set
Unlock answersquestion
| What is the energy of motion? |
answer
| Kinetic energy |
question
| What type of energy is an example of kinetic energy? |
answer
| thermal energy |
question
| What type of energy is possessed by objects because of their position or arrangement? |
answer
| potential energy |
question
| What is the unit of energy? |
answer
| the calorie |
question
| What is the definition of a calorie? |
answer
| the amount of heat needed to raise the temperature of 1 gram of water up one degree Celsius. |
question
| What is the SI unit of energy? |
answer
| the joule |
question
| 1 cal = ? joules? |
answer
| 4.184 |
question
| What is the law of conservation of energy? |
answer
| energy is neither created nor destroyed by any process |
question
| What is absolute zero? |
answer
| the temperature at which the motion of the particles within the substance ceases, kinetic energy is zero. 0 degress K.. -273 degrees C |
question
| What is matter? |
answer
| anything that has mass and volume |
question
| What is a solid state of matter? |
answer
| regular shape and volume |
question
| What is the liquid state of matter? |
answer
| regular volume, irregular shape |
question
| What is the gas state of matter? |
answer
| irregular shape and volume |
question
| What is a phase change? |
answer
| change from one state of matter to another |
question
| What has chemical properties and can undergo physical and chemical changes? |
answer
| matter |
question
| What are physical properties? |
answer
| characteristics that can be observed without altering the substance |
question
| What are chemical properties? |
answer
| characteristics that cannot be observed without altering the substance |
question
| What is a physical change? |
answer
| a change that doesn't change the substance |
question
| What is a chemical change? |
answer
| a change where a new substance is formed |
question
| What is the conservation of matter? |
answer
| matter cannot be created or destroyed in any process |
question
| What did Antonie Lavoisier do? |
answer
| conducted experiments to prove that the total mass of the substances in an experiment will not change |
question
| What is an element? |
answer
| a substance that cannot be separated into simpler substances by a chemical change |
question
| What contains all known elements? |
answer
| the periodic table |
question
| T or F, elements are not pure substances? |
answer
| FALSE SUCKER! Elements are pure substances |
question
| What is a pure substance? |
answer
| any substance that is made up of one kind of material with a unique set of chemical and physical properties |
question
| What is a compound? |
answer
| two or more elements combined by a chemical reaction. They are also pure substances and can be separated. |
question
| What is a mixture? |
answer
| a blend of two or more pure substances |
question
| What are homogeneous mixtures? |
answer
| mixtures that are the same throughout, and has no visible different parts |
question
| what are heterogeneous mixtures? |
answer
| not the same throughout, has visible different parts |
question
| Can mixtures be separated? |
answer
| YEEEUUP. |
question
| Who came up with atomos? |
answer
| democritus |
question
| What did Democritus propose? |
answer
| that all matter is actually composed of tiny indivisible particles which he termed "atoms" |
question
| What is an atom? |
answer
| the smallest particle of an element that retains the chemical identity of that element |
question
| What did Lavoisier do in chapter 3? :D |
answer
| he studied the conservation of matter |
question
| What did the experiments of Lavoisier lead to? |
answer
| Joseph Proust conducting experiments on the law of constant composition. |
question
| What is the law of constant composition? |
answer
| a given compound will always contain the same elements in the same proportion |
question
| Who came up with the atomic theory? |
answer
| Dalton |
question
| What are the postulates to the atomic theory? (4) |
answer
| 1. Each element is composed of extremely small particles called atoms 2. All atoms of a given element are identical, but they differ from those of any other element. 3.Atoms are neither created nor destroyed in any chemical reaction 4.A given compound always has the same relative numbers and kinds of atoms |
question
| What did Michael Faraday suggest/state? |
answer
| that the structure of atoms was somehow related to electricity, and that atoms contain particles that have electrical charge. |
question
| What did Ben Franklin do? |
answer
| conducted several experiments on electricity and concluded that an object could have one of two charges.. postive or negative. (he didn't know where the charges came from though) |
question
| what did JJ thomson do? (3) |
answer
| -conducted experiments on cathode ray tubes -found that the stream was influenced by electric and magnetic fields -concluded that they ray was composed of negatively charge particles.. ELECTRONS |
question
| Who named electrons? |
answer
| J.J. Thomson |
question
| What is a cathode ray tube? |
answer
| an evacuated glass tube in which a stream of electrons emitted by a cathode strikes a fluorescent material causing it to glow |
question
| What did JJ thomson look like? |
answer
| A hot babe |
question
| Extra fun fact about thomson? |
answer
| he found the charge to mass ratio of an electron |
question
| What is the charge to mass ratio of an electron? |
answer
| 1.76 x 10^8 C/g |
question
| What did Robert milikan conduct his famous oil drop experiment to find what? |
answer
| the mass and charge of an electron |
question
| What is the mass of an electron? |
answer
| 9.11 x 10^-28 g |
question
| What is the charge of an electron? |
answer
| 1.60 x 10^-19 |
question
| What did Henry Becquerel find? |
answer
| uranium.. and that it exhibits radioactivity |
question
| What is radioactivity? |
answer
| the spontaneous emission of radiation from an element |
question
| Who else isolated other radioactive elements, radium, and polonium? |
answer
| Marie and pierre curie |
question
| What did scientists discover the more they studied radioactivity? |
answer
| that radioactivity accompanies fundamental changes in an atom |
question
| Who came up with the plum pudding model? |
answer
| Thomson |
question
| What did Rutherford do? |
answer
| conduct his famous Gold Foil experiment and proposed an atom had a postively charge nucleus |
question
| What are atoms composed of? |
answer
| protons, neutrons, and electrons |
question
| What in an atom contains the protons and neutrons? |
answer
| the nucleus |
question
| What move in space around the nucleus? |
answer
| electrons |
question
| know the charge, mass (g) and mass (amu) of subatomic particles? |
answer
| look at it.. NOW. |
question
| What is the number of protons called? |
answer
| atomic number |
question
| What is an ion? |
answer
| a charge atom, positive or negative |
question
| How do you determine the charge of an atom? |
answer
| number of protons - number of electrons. |
question
| What are isotopes? |
answer
| atoms that have the same number of protons but different number of neutrons |
question
| What is an atomic mass unit? |
answer
| a unit used by chemists for measuring the mass of atoms |
question
| What is atomic mass? |
answer
| the average mass of the isotopes of an element |
question
| What is a nuclear reaction? |
answer
| a reaction that changes the composition of an atom's nucleus |
question
| What is strong nuclear force? |
answer
| force that holds the nucleus together |
question
| Why would nuclei ever be unstable? |
answer
| if they contain too few or too many neutrons |
question
| What are the three types of radioactive decay? |
answer
| alpha beta gamma |
question
| What is radioactive decay? |
answer
| atom emits one or more type of radiation |
question
| What is a nuclear equation? |
answer
| an equation that represents nuclear decay |
question
| Energy is defined as the capacity to..? |
answer
| Do work |
question
| Example of potential energy (3) |
answer
| 1. A dry-cell battery in your camera 2. The water behind a dam 3. The gasoline in your car tank |
question
| The SI scale used to measure temperature is the ___? |
answer
| Kelvin scale |
question
| Absolute zero = |
answer
| 0K |
question
| The law of conservation of matter states: |
answer
| Matter is neither created nor destroyed in any process (I know you already have this one, but study it again!) |
question
| The new properties observed during a change of state are not signs of a chemical change because? |
answer
| The chemical identity of the substance has not been altered. |
question
| Example of a chemical change? |
answer
| Burning a piece of toast (there will be bread for you in the morning, Ash) |
question
| Elements and compounds are both considered pure substances because they...? |
answer
| Have a unique set of chemical and physical properties |
question
| Electrolysis could be used to? |
answer
| Seperate water into oxygen and hydrogen gas |
question
| Both homogeneous and heterogeneous mixtures..? |
answer
| Are blends of 2 or more pure substances |
question
| NOT a heterogeneous mixture? |
answer
| Air |
question
| An atom is? |
answer
| The smallest particle of an element that retains the chemical identity of that element |
question
| Dalton's atomic theory did NOT include the postulate that..? |
answer
| Atoms contain electrons, protons and nuetrons |
question
| The electrical charges in an atom are located? |
answer
| On protons and electrons |
question
| J.J. Thomson concluded that a cathode ray? |
answer
| 1. Produced a green spot on the fluorescent screen 2. A magnetic field deflected by electrically charged plates |
question
| Rutherford's alpha scattering experiment indicated that? |
answer
| Positive charges are concentrated in a very small core at the atom's center |
question
| True statement about radiationq |
answer
| Beta radiation consists of high-speed electrons. |
question
| Scientists have determined that electrons..? |
answer
| Move in the space around the nucleus |
question
| Atoms of each element contain a unique number of |
answer
| Protons |
question
| Two isotpes of the same element may have different? |
answer
| Mass numbers and numbers of neutrons |
question
| An atom may be radioactive if the nucleus contains? (3) |
answer
| 1. More than 83 protons 2. Too few neutrons 3. Too many neutrons |
question
| What is the frequency of a wave inversely proportional to? |
answer
| wavelength |
question
| What is the speed of light? |
answer
| 3.00 x10^8 |
question
| What type of waves are microwaves shorter than? |
answer
| radio waves |
question
| What energy is emitted or absorbed by any object in fixed amounts? (proposed by radio waves) |
answer
| quanta |
question
| What does the photoelectric effect depend on? |
answer
| the energy of photons (proposed by einstein) |
question
| Light is said to have properties of both particles aaaaand???? |
answer
| waves |
question
| What do you need to know about the line spectrum of an element? |
answer
| 1.its produced when elements emit light 2. it can be used to identify elements. |
question
| Why did Bohr postulate that elements have enique line spectra? |
answer
| because the energy of electrons is quantized. |
question
| What does the Heisenberg unceertainty principle state? |
answer
| that in measuring the psition of an electron you invariably change the electrons charge |
question
| What orbital is shaped like a dumbell? |
answer
| the p orbital |
question
| What are the rpincipal energy levels of an atom? |
answer
| n=1 n=2 n=3 |
question
| What is the Aufbau principle? |
answer
| the statement that electrons must be added one at a time to the lowewst energy orbitals available. |
question
| What is an orbital? |
answer
| A region of space where an electron with a particular energy is likely to be found |
question
| What does the brightness of light depend on? |
answer
| the amilitude of the wave. |
question
| What type of waves have longer wavelenths than visible light? |
answer
| radio waves and microwave |
question
| What type spin are electrons to have in order to occupy the same oribital? |
answer
| oppisite spin |
question
| Any form of electromagnetic radiation (light) regardless of wavelength will travel at what speed? |
answer
| the SPEED OF LIGHT!! |
question
| What is the equation for the speed of light? |
answer
| c = 3 x 10^8 m/s |
question
| What is the electromagnetic spectrum? |
answer
| all wavelengths of light |
question
| What 4 characteristics are all waves described? |
answer
| amplitude wavelength frequency speed |
question
| What is amplitude? |
answer
| height of the wave |
question
| What is wavelength? |
answer
| the length of the wave |
question
| What is frequency? |
answer
| how fast the wave oscillates up and down |
question
| what is speed? |
answer
| how fast the wave travels through a medium |
question
| Who proposed the Quantum Theory? What year and country? |
answer
| physicist Max Planck germany, 1900 |
question
| What did Max Planck propose in 1900? |
answer
| that there is a fundamental restriction on the amounts of energy that an object emits or absorbs |
question
| What is a Quantum? (plural) |
answer
| fixed amount of energy (Quanta) |
question
| What is the quantum theory? (definition and equation) |
answer
| it related energy to the frequency of light emitted or absorbed by a substance. E = hv h is planck's constant and v is frequency |
question
| What is the photoelectric effect? |
answer
| when electrons are ejected from a metallic surface when light shines on the metal |
question
| What did einstein use to prove the photelectric effect? |
answer
| planck's equation |
question
| German Physicist who proposed that there is a fundamental restriction on the amounts of energy that an object emits or absorbs |
answer
| Max Planck |
question
| What are photons? |
answer
| tiny particles of light that consisit of a quanta of energy |
question
| What is a fixed amount of energy? |
answer
| A Quantum |
question
| What is the speed of light? |
answer
| c = 3 x 10^8 m/s |
question
| All waves are described in terms of 4 characteristics. What are they? |
answer
| 1. Amplitude: height of the wave 2. Wavelength: length of the wave 3. Frequency: how fast the wave moves up and down 4. Speed: how fast it travels through a medium |
question
| What is a line spectrum? |
answer
| a spectrum that only contains certain colors of light |
question
| What is a spectroscope? |
answer
| an instrument used to split light into its individual wavelengths |
question
| What is the electromagnetic spectrum? |
answer
| All wavelengths of light |
question
| What is wave-particle duality? |
answer
| waves have particle-like characteristics (photoelectric effect) and particles have wave-like characteristics (matter waves) |
question
| What's the photoelectric effect? |
answer
| Electrons are ejected from a metallic surface when light shines on the metal. |
question
| What is a quantum mechanical model? |
answer
| a wave model that models the atom with electrons acting like waves rather than particles |
question
| What is electron density? |
answer
| the region of high probability where electrons could exist |
question
| Who proved the Photoelectric effect? |
answer
| Einstein |
question
| What is an orbital? |
answer
| a region around the nucleus where an electron is likely to be found |
question
| Know what colors you see normaly vs. what colors you see with a spectrascope |
answer
question
| Electrons exist in orbits around the nucleus in areas called what? |
answer
| energy levels |
question
| Each energy level is labeled by what? |
answer
| quantum number |
question
| What is the lowest energy level? |
answer
| a ground state |
question
| What will an electron do when it absorbs a fixed amount of energy? |
answer
| it will jump to a higher energy level |
question
| Who came up with the uncertainty principle? |
answer
| Werner Heisenberg |
question
| What is each energy level labled by? |
answer
| A quantum number |
question
| What is the uncertainty principle? |
answer
| the proposition that the position and momentum of moving particles cannot simultaneously be measured and known exactly |
question
| What is ground state? |
answer
| The lowest energy level (n=1) |
question
| Does the uncertainty principle matter for large objects? |
answer
| nope |
question
| What must you have for two electrons to exist? |
answer
| Opposite spin |
question
| What is the reason we can't locate electrons? |
answer
| the uncertainty principle |
question
| What are all the different orbital shapes? |
answer
| s, p, d, f |
question
| what are principal energy levels? |
answer
| quantum numbers from the Bohr model |
question
| what type of energy level can be divided into sub levels? |
answer
| principal energy levels |
question
| How are sublevels named? |
answer
| using the principal energy level and orbital shape |
question
| Know how to do electron configuration! |
answer
| Electron configuration s=2 p=6 d=10 f=14 Orbital Diagram s=1 p=3 d=5 f=7 |
question
| The number of sublevels =? |
answer
| quantum number |
question
| What is the rule with electron spin? |
answer
| that spinning electrons can pair up if the spin is opposite |
question
| What is electron configuration with boxes? |
answer
| orbital diagram |
question
| What is electron configuration? |
answer
| the distribution of electrons among levels, sublevels, and orbitals |
question
| Know the difference between ground state and excited state! |
answer
| Ground is where the electron normaly sits on the Bohr model. Excited state is when the electron jumps to the next energy level. |
question
| What is the aufbau principle? |
answer
| that electrons are added to the lowest energy level one at a time |
question
| What is the Pauli Exclusion principle? |
answer
| orbitals that can hold a max of 2 electrons with oppsite spin |
question
| What is hund's rule? |
answer
| one electron per orbital before pairing |
question
| What are some differences between the quantum model and bohr model? |
answer
| The bohr model is easier to read and understand. It also has rings and orbits around it like the sun. The quantum model has many different shapes and is harder to understand. waves. |
question
| Order of electron configuration... |
answer
| 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 6f 7s 7p 7d 7f..... |
question
| Why were the flames in our lab colorful?? (This one will be a short answer on test) |
answer
| When you light the chemical on fire, the electrons get excited and move to the next energy level by giving of energy in the form of light...in this case, many different colors of light. |
question
| What's the difference between the Bohr model and the quantum mechanical model? |
answer
| The Bohr model has ORBITS and rings. The quantum mechanical model has multiple different shapes and it has ORBITALS. |
question
| What is frequency measured in? |
answer
| Hz (Hurts) |
question
| What is frequency measured in? |
answer
| Hz (Hurts) |
question
| What is speed measured in? |
answer
| V (Velocity) |
question
| Light waves: transverse |
answer
| Don't ask. I had it written down, so I put it in here. |
question
| E = hf |
answer
| h = Plank's constant (6.6262 x 10^-35 J-s) |
question
| Wavelength = c/f |
answer
| c = speed of light (3.00 x 10^8 m/s) |
question
| What is the energy of motion? |
answer
| Kinetic energy |
question
| What type of energy is an example of kinetic energy? |
answer
| thermal energy |
question
| What type of energy is possessed by objects because of their position or arrangement? |
answer
| potential energy |
question
| What is the unit of energy? |
answer
| the calorie |
question
| What is the definition of a calorie? |
answer
| the amount of heat needed to raise the temperature of 1 gram of water up one degree Celsius. |
question
| What is the SI unit of energy? |
answer
| the joule |
question
| 1 cal = ? joules? |
answer
| 4.184 |
question
| What is the law of conservation of energy? |
answer
| energy is neither created nor destroyed by any process |
question
| What is absolute zero? |
answer
| the temperature at which the motion of the particles within the substance ceases, kinetic energy is zero. 0 degress K.. -273 degrees C |
question
| What is matter? |
answer
| anything that has mass and volume |
question
| What is a solid state of matter? |
answer
| regular shape and volume |
question
| What is the liquid state of matter? |
answer
| regular volume, irregular shape |
question
| What is the gas state of matter? |
answer
| irregular shape and volume |
question
| What is a phase change? |
answer
| change from one state of matter to another |
question
| What has chemical properties and can undergo physical and chemical changes? |
answer
| matter |
question
| What are physical properties? |
answer
| characteristics that can be observed without altering the substance |
question
| What are chemical properties? |
answer
| characteristics that cannot be observed without altering the substance |
question
| What is a physical change? |
answer
| a change that doesn't change the substance |
question
| What is a chemical change? |
answer
| a change where a new substance is formed |
question
| What is the conservation of matter? |
answer
| matter cannot be created or destroyed in any process |
question
| What did Antonie Lavoisier do? |
answer
| conducted experiments to prove that the total mass of the substances in an experiment will not change |
question
| What is an element? |
answer
| a substance that cannot be separated into simpler substances by a chemical change |
question
| What contains all known elements? |
answer
| the periodic table |
question
| T or F, elements are not pure substances? |
answer
| FALSE SUCKER! Elements are pure substances |
question
| What is a pure substance? |
answer
| any substance that is made up of one kind of material with a unique set of chemical and physical properties |
question
| What is a compound? |
answer
| two or more elements combined by a chemical reaction. They are also pure substances and can be separated. |
question
| What is a mixture? |
answer
| a blend of two or more pure substances |
question
| What are homogeneous mixtures? |
answer
| mixtures that are the same throughout, and has no visible different parts |
question
| what are heterogeneous mixtures? |
answer
| not the same throughout, has visible different parts |
question
| Can mixtures be separated? |
answer
| YEEEUUP. |
question
| Who came up with atomos? |
answer
| democritus |
question
| What did Democritus propose? |
answer
| that all matter is actually composed of tiny indivisible particles which he termed "atoms" |
question
| What is an atom? |
answer
| the smallest particle of an element that retains the chemical identity of that element |
question
| What did Lavoisier do in chapter 3? :D |
answer
| he studied the conservation of matter |
question
| What did the experiments of Lavoisier lead to? |
answer
| Joseph Proust conducting experiments on the law of constant composition. |
question
| What is the law of constant composition? |
answer
| a given compound will always contain the same elements in the same proportion |
question
| Who came up with the atomic theory? |
answer
| Dalton |
question
| What are the postulates to the atomic theory? (4) |
answer
| 1. Each element is composed of extremely small particles called atoms 2. All atoms of a given element are identical, but they differ from those of any other element. 3.Atoms are neither created nor destroyed in any chemical reaction 4.A given compound always has the same relative numbers and kinds of atoms |
question
| What did Michael Faraday suggest/state? |
answer
| that the structure of atoms was somehow related to electricity, and that atoms contain particles that have electrical charge. |
question
| What did Ben Franklin do? |
answer
| conducted several experiments on electricity and concluded that an object could have one of two charges.. postive or negative. (he didn't know where the charges came from though) |
question
| what did JJ thomson do? (3) |
answer
| -conducted experiments on cathode ray tubes -found that the stream was influenced by electric and magnetic fields -concluded that they ray was composed of negatively charge particles.. ELECTRONS |
question
| Who named electrons? |
answer
| J.J. Thomson |
question
| What is a cathode ray tube? |
answer
| an evacuated glass tube in which a stream of electrons emitted by a cathode strikes a fluorescent material causing it to glow |
question
| What did JJ thomson look like? |
answer
| A hot babe |
question
| Extra fun fact about thomson? |
answer
| he found the charge to mass ratio of an electron |
question
| What is the charge to mass ratio of an electron? |
answer
| 1.76 x 10^8 C/g |
question
| What did Robert milikan conduct his famous oil drop experiment to find what? |
answer
| the mass and charge of an electron |
question
| What is the mass of an electron? |
answer
| 9.11 x 10^-28 g |
question
| What is the charge of an electron? |
answer
| 1.60 x 10^-19 |
question
| What did Henry Becquerel find? |
answer
| uranium.. and that it exhibits radioactivity |
question
| What is radioactivity? |
answer
| the spontaneous emission of radiation from an element |
question
| Who else isolated other radioactive elements, radium, and polonium? |
answer
| Marie and pierre curie |
question
| What did scientists discover the more they studied radioactivity? |
answer
| that radioactivity accompanies fundamental changes in an atom |
question
| Who came up with the plum pudding model? |
answer
| Thomson |
question
| What did Rutherford do? |
answer
| conduct his famous Gold Foil experiment and proposed an atom had a postively charge nucleus |
question
| What are atoms composed of? |
answer
| protons, neutrons, and electrons |
question
| What in an atom contains the protons and neutrons? |
answer
| the nucleus |
question
| What move in space around the nucleus? |
answer
| electrons |
question
| know the charge, mass (g) and mass (amu) of subatomic particles? |
answer
| look at it.. NOW. |
question
| What is the number of protons called? |
answer
| atomic number |
question
| What is an ion? |
answer
| a charge atom, positive or negative |
question
| How do you determine the charge of an atom? |
answer
| number of protons - number of electrons. |
question
| What are isotopes? |
answer
| atoms that have the same number of protons but different number of neutrons |
question
| What is an atomic mass unit? |
answer
| a unit used by chemists for measuring the mass of atoms |
question
| What is atomic mass? |
answer
| the average mass of the isotopes of an element |
question
| What is a nuclear reaction? |
answer
| a reaction that changes the composition of an atom's nucleus |
question
| What is strong nuclear force? |
answer
| force that holds the nucleus together |
question
| Why would nuclei ever be unstable? |
answer
| if they contain too few or too many neutrons |
question
| What are the three types of radioactive decay? |
answer
| alpha beta gamma |
question
| What is radioactive decay? |
answer
| atom emits one or more type of radiation |
question
| What is a nuclear equation? |
answer
| an equation that represents nuclear decay |
question
| Energy is defined as the capacity to..? |
answer
| Do work |
question
| Example of potential energy (3) |
answer
| 1. A dry-cell battery in your camera 2. The water behind a dam 3. The gasoline in your car tank |
question
| The SI scale used to measure temperature is the ___? |
answer
| Kelvin scale |
question
| Absolute zero = |
answer
| 0K |
question
| The law of conservation of matter states: |
answer
| Matter is neither created nor destroyed in any process (I know you already have this one, but study it again!) |
question
| The new properties observed during a change of state are not signs of a chemical change because? |
answer
| The chemical identity of the substance has not been altered. |
question
| Example of a chemical change? |
answer
| Burning a piece of toast (there will be bread for you in the morning, Ash) |
question
| Elements and compounds are both considered pure substances because they...? |
answer
| Have a unique set of chemical and physical properties |
question
| Electrolysis could be used to? |
answer
| Seperate water into oxygen and hydrogen gas |
question
| Both homogeneous and heterogeneous mixtures..? |
answer
| Are blends of 2 or more pure substances |
question
| NOT a heterogeneous mixture? |
answer
| Air |
question
| An atom is? |
answer
| The smallest particle of an element that retains the chemical identity of that element |
question
| Dalton's atomic theory did NOT include the postulate that..? |
answer
| Atoms contain electrons, protons and nuetrons |
question
| The electrical charges in an atom are located? |
answer
| On protons and electrons |
question
| J.J. Thomson concluded that a cathode ray? |
answer
| 1. Produced a green spot on the fluorescent screen 2. A magnetic field deflected by electrically charged plates |
question
| Rutherford's alpha scattering experiment indicated that? |
answer
| Positive charges are concentrated in a very small core at the atom's center |
question
| True statement about radiationq |
answer
| Beta radiation consists of high-speed electrons. |
question
| Scientists have determined that electrons..? |
answer
| Move in the space around the nucleus |
question
| Atoms of each element contain a unique number of |
answer
| Protons |
question
| Two isotpes of the same element may have different? |
answer
| Mass numbers and numbers of neutrons |
question
| An atom may be radioactive if the nucleus contains? (3) |
answer
| 1. More than 83 protons 2. Too few neutrons 3. Too many neutrons |
