Chemistry 1 Midterm

Flashcard maker : Jill Lopez
Chemistry
the science that deals with the materials of the universe and the changes that these materials undergo
Scientific Method
the process that lies at the center of scientific inquiry.
Natural Law
general observations of a behavior
Hypothesis
one or more assumptions put forth before an experiment
Theory
a set of tested hypothesis that gives an overall explanation of a part of nature.
What is a summary of an observed behavior.
Law
The state of matter for an object that has neither a definite shape or volume is…
Gaseous
The state of matter for an object that has a definite volume but not a definite shape.
Liquid
The state of matter that has both a definite shape and volume.
Solid
Anything that has mass and volume.
Matter
Is Cooking an egg a physical or chemical change?
Chemical
Is boiling water a physical or chemical change?
Physical
Is ironing a shirt a physical or chemical change?
Physical
Is burning gasoline a physical or chemical change?
Chemical
Is decomposing water a physical or chemical change?
Chemical
Is evaporating alcohol a physical or chemical change?
Physical
Is sanding a table top a physical or chemical change?
Physical
Is grinding grain a physical or chemical change?
Physical
Is fermenting fruit juice a physical or chemical change?
Chemical
Is dissolving sugar in water a physical or chemical change?
Physical
A sample of an element contains only one kind of…
Atom
An element is a collection of a single kind of…
Atoms
Sand on the beach is an example of a…
Heterogeneous Mixture
Pure Substance
a chemical substance is a form of matter that has constant chemical composition and characteristic properties
A solution can be a heterogeneous mixture or a homogeneous mixture. (True/False)
False
Is table salt…
(a)Element (b)A Compound (c)Homogeneous Mixture (d)Heterogeneous Mixture
B
Is Chlorine Gas…
(a)Element (b)A Compound (c)Homogeneous Mixture (d)Heterogeneous Mixture
A
Is sand in water…
(a)Element (b)A Compound (c)Homogeneous Mixture (d)Heterogeneous Mixture
D
Is petroleum…
(a)Element (b)A Compound (c)Homogeneous Mixture (d)Heterogeneous Mixture
C
Is caffeine…
(a)Element (b)A Compound (c)Homogeneous Mixture (d)Heterogeneous Mixture
B
Water is an example of a…
A compound
A solution can be distinguished from a compound by its…
Heterogeneous Mixture
14K gold is a…
(a)element (b)A Compound (c)A Mixture
A
Pure Silver is a…
(a)element (b)A Compound (c)A Mixture
A
Aluminum is a…
(a)element (b)A Compound (c)A Mixture
A
Distilled Water is a…
(a)element (b)A Compound (c)A Mixture
B
Tap Water is a…
(a)element (b)A Compound (c)A Mixture
C
Brass is a…
(a)element (b)A Compound (c)A Mixture
C
Tungsten is a…
(a)element (b)A Compound (c)A Mixture
A
Sodium Chloride is a…
(a)element (b)A Compound (c)A Mixture
B
Air is a…
(a)element (b)A Compound (c)A Mixture
C
A pure substance made up of more than one kind of atom.
A Compound
What is the most abundant element on the earth.
Oxygen
What is the most abundant element found in the human body?
Oxygen
Compounds
substances made by bonding atoms together in a specific way.
Molecule
made up of atoms stuck together
Physical Properties
odor, color, volume, state, density, melting point, and boiling point
Chemical Properties
Mixture
something that has variable composition.
Alloys
Mixtures of metals.
Pure Substance
always has the same composition
Homogeneous Mixture
the same throughout
Heterogeneous Mixture
contains regions have different properties than other regions.
Solution
also called a Homogeneous Mxture
Law of Constant Composition
elements always contain the same properties
Daltons Atomic Theory
Point #1
Elements are made of tiny particals called atoms
Daltons Atomic Theory
Part #2
All atoms of a given element are identical
Daltons Atomic Theory
Part #3
The atoms of a given element are different from those of any other element
Daltons Atomic Theory
Part #4
Atoms of one element can be combine with atoms of another element to form compounds. A given compound always has the same relative number and type of atoms.
Daltons Atomic Theory
Part #5
Atoms are indivisible in chemical process. That is, atoms are not created or destroyed in chemical reactions. A chemical reaction simply changes the way the atoms are grouped together
Electrons
negative particals
Nuclear Atoms
an atom with a dense center of positive charge around which tiny electrons moved in a space that was otherwise empty
Isotopes
atoms with the same number of protons but different number
Atomic Number
the number of protons in an neucleus
Mass Number
the sum of the number of neutrons and protons in a neucleus
Thompsons Experiment
Cathrode Ray Tube
The Plum Pudding Model
Lord Kelvin and J.J Tompson
Ion
taking a neutral atom and adding or removing one or more electrons
Cation
A positive Ion
Anion
Negatively charged ion
Ionic Compounds
Any substance containing Ions
Binary Compound
Contain both a positive and negative ion
Binary ionic Compound
A two element compound consisting of a cation and a anion
A substance composed of two or more elements combined chemically in a fixed proportion by mass
Compound
A fundamental particle of a chemical element according to Dalton’s Theory
The Atom
In Chemistry a formula is used to represent?
A Compound
How many hydrogen atoms are indicated in the formula: (NH4)2 C8 H4 O2
12H
Medeleev is credited with the modern Atomic Theory of Atoms. (True/False)
False. Mendeleev created the periodic table
The first scientist to show that atoms emit tiny negative particles is…
J.J Thompson
The Scientist whose alpha particle scattering experiment led him to conclude that the nucleus of an atom contains a dense center of positive charge is…
Ernest Rutherford
Which atomic particle determines the chemical behavior of an atom?
Electrons
Three main subatomic particles
Protons. Neutrons. Electrons
Which particle has the smallest mass?
Electrons

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