## Midterm review

 Total number of significant digits1000
 Total number of sig figs in 0.00230
 Solve and answer in correct sig figs:3.90g + 14.1000g=
 Which set is more precise?a: 2.0,2.1, 2.2b:2.000, 2.090,2.080
 b:since it goes further past the decimal
 Definition of accuracy?
 Ability to hit the target
 Definition of precision?
 Ability to duplicate
 State the correct unit for each:mass, temp, length
 kg (kilogram), K (Kelvin), m (meter)
 Define control:
 The group or population in the experiment which is used for comparison.
 Identify the IV and DV. If the concentration of sugar is higher then then more flies will be attracted.
 IV: Concentration of sugarDV: Number of flies
 Define constant:
 Anything else in an experiment that must be kept the same or it becomes an introduced variable
 Number of protons, electrons, and nuetrons in a nuetral atom of carbon.
 6,6,6
 Use your periodic table to state the number of protons, electrons, and neutrons in Br.
 p+= 35e= 35n=45
 Use your periodic table to state the number of protons, electrons, and neutrons in Mn.
 p+= 25e= 25n=30
 Use your periodic table to state the number of protons, electrons, and neutrons in Cr-51
 p+=24e= 24n= 27
 Which element has 20 protons and 21 neutrons?
 Ca-41
 Which neutral element has 25 electrons and 29 neutrons?
 Mn-54
 Use your periodic table to state the number of protons, electrons, and neutrons in Mg +2
 p=12e= 10n= 12
 Use your periodic table to state the number of protons, electrons, and neutrons in I -1
 p= 53e= 54n= 74
 Name the type of element in Group I.
 Alkali metals
 Name the type of element in Group 14 with a p2 outer electron configuration.
 Silicon
 Which energy level is being filled in transition metals?
 d
 Write the electron configuration for P.
 1s2 2s2 2p6 3s2 3p3.
 Write the electron configuration for Gold.
 [Xe] 6s1 4f14 5d10
 Identify the element. [Xe] 6s2 4f14 5d4
 Tungsten
 Identify the element. [Kr] 5s2 4d2
 Zirconium
 Name the elements in Group 17.
 Halogens
 What type of charge to alkali earth metals tend to acquire?
 +2
 What type of charge does oxygen tend to acquire?
 -2
 Which noble gas configuration will the sulfur ion match?
 Argon
 Which noble gas configuration will the ion for sodium match?
 Neon
 Which form of electromagnetic radiation has greater energy, green or ultraviolet?
 UV
 Neither, they have the same speed.
 Which form of electromagnetic radiation has higher wavelength, microwave or gamma ray?
 Microwave
 What causes elements to create colors when burned?
 Electrons emitting a photon of light as it releases the energy when falling back down to a lower energy level.
 How many valence electrons does potassium have?
 1
 How many valence electrons does chlorine have?
 7
 What is the outer electron configuration for alkali metals?
 s2
 Explain the role of positive and negative ions.
 Cations (+) and anions (-) occur when elements give or take electrons in order to have more stable electron configurations. As charged particles they are more likely to bond and in ratios that represent their charges.
 Name the geometry and bonding angles for SO3
 trigonal planar, 120 degree
 Name the geometry and bonding angle for water.
 Bent, 109.5degree
 Predict the type of bond between two fluorine atoms.
 nonpolar covalent
 Predict the bond type between Li and F
 ionic
 If Hydrogen en=2.1 and f en=4.0 the bond type is.
 Polar covalent
 Which type of bond shares electrons?
 covalent
 What is the pattern down a group for electronegativities and atomic size.
 lower, larger
 What is the pattern going from left to right across a period for atomic size.
 Tends to decrease.
 Write the formula for dinitrogen pentaoxide.
 P2O5
 Which type of bonding uses prefixes to name the compounds?
 Covalent
 Write the formula for aluminum oxide.
 Al2O3
 Write the formula for copper II oxide.
 CuO
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