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1
Which of the following will NOT increase the rate of a reaction?
Decreasing the concentration of reactants.
Grinding a solid into powder.
Increasing the temperature of the reactants.
Adding a catalyst
2
Which of the following statements about weight is true?
it depends on where the object is in relation to Earth
Weight is measured using a spring scale
Weight is a measure of gravitational force on an object.
All the above
3
Which has the most energy?
Particles in ice.
Particles in cold water.
Particles in warm water.
Particles in steam.
4
What is the study of structures and properties of matter?
Physics
Chemistry
Geology
Biology
5
A metallic bond is formed between?
Positively charged metal ions and electrons
Electrons and Protons
Neutrons and Electrons
Protons and Neutrons
6
In nuclear fusion what happens to the nuclei?
Nuclei gain protons
Nuclei fuse
Nuclei break down
Nuclei lose neutrons
7
Why is hydrogen set apart from the other elements in the periodic table?
Hydrogen is a gas at room temperature.
Hydrogen's properties do not match the any single group.
Hydrogen is the most abundant element in the universe.
Hydrogen has a low density.
8
The weighted average of all isotopes of an element is its?
Atomic Number
Mass number
Atomic Mass
Isotope number
9
An atom that has the same number of protons but a different number of neutrons is an?
Isotope
Nucleus
Electron Cloud
Atom
10
One property that all particles of matter have in common is they?
Never move in a solid.
Move constantly.
Only move in gases.
None of the above.
11
What unit of density would be appropriate to describe a solid bar of silver?
g/cm^3
oz/ft^3
g/mL
kg/L
12
When a substance changes from one physical form to another, we say the substance has had an?
Chemical change
Change of property
Change of state
Change of form
13
A combination of two or more substances that are not chemically combined is an?
Solute
Alloy
Mixture
Compound
14
What are the steps that scientists use to answer questions and solve problems?
Observations
Scientific method
Physical Science
Measurments
15
In nuclear fission what happens to the nuclei?
Nuclei lose electrons
Nuclei gain neutrons
Nuclei break down
Nuclei combine.
16
Electrons in the outer most level of an atom are called what?
Bonding electrons
Noble electrons
Valence electrons
Prime electrons
17
Each vertical column on the periodic table is called an?
Period
Element
Property
Group
18
In alpha (α) decay what is the alpha particle made up of?
1 proton and 1 neutron
protons and electrons
2 protons and 2 neutrons
An electron
19
Boyle's Law describes the relationship between?
All the above.
Volume and pressure.
Temperature and pressure.
Temperature and volume.
20
Charles's Law describes the relationship between?
None of the above.
Temperature and pressure.
Temperature and volume.
Volume and pressure.
21
An ionic bond forms when?
When protons are lost.
Electrons are shared with another atom.
When electrons are transferred from one atom to another.
When protons are gained.
22
In gamma (γ) decay what type of energy is released?
Light
Electrical
Chemical
Heat
23
The law of conservation of mass states that mass cannot be created or destroyed in ordinary?
Radioactive changes
Chemical changes
Chemical and physical changes
Physical changes
24
Most chemical reactions?
Do not rearrange atoms.
Do not break bonds.
Cannot be seen.
Have starting substances that collide with each other.
25
A covalent bond is formed when?
When atoms share one or more electrons.
When atoms lose an electron to another atom.
When atoms gain a proton.
When atoms share a pair of electrons.
26
Each horizontal row on the periodic table is called an?
Atomic Number
Period
Family
Group
27
In beta (β) decay what type of beta particle(s) can be released?
Proton
Neutron or proton
electron
Electron or Positron
28
Measuring something is one way of?
Analyzing results
Conducting experiments safely
Making a model
Collecting data
29
When two or more elements are joined by chemical bonds to form a new pure substance we call it?
Element
Compound
Colloid
Solution
30
A characteristic of matter that can be observed without changing the identity of the matter is?
Chemical Property
Matter Property
Physical Property
Volume Property
31
What is matter?
The "stuff" that everything is made of.
The "stuff" from outer space.
The "stuff" that is large enough to see.
The "stuff: that makes up the atmosphere.
32
Which of the following is NOT a physical or chemical change?
Melting
Crushing
Passing an electric current
Weighing
33
What kind of charge does an electron have?
Neutral
Positive
Negative
34
Boiling point, melting, and density are some of an element's what?
nonreactive properties
physical properties
chemical properties
pure properties
35
What gives elements in a family or group similar properties?
The same atomic mass.
The same number of protons in their nuclei.
The same number of electrons in their outer energy level.
The same number of total electrons.
36
During a chemical bond electrons are?
Lost
All the above
Shared
Gained
37
Who are the "Big Three" ?
Democritus, Aristotle, Dalton
Newton, Darwin, Aristotle
Aristotle, Bohr, Thompson
38
The tendency of an object to resist a change in motion is known as?
Gravitation
Inertia
Weight
Mass
39
The characteristic of matter that describes its ability to change into new matter?
Physical Property
Chemical Change
Chemical Property
Physical Change
40
What do scientists use to represent a system or an object?
A model
A study
A hypothesis
An observation
41
Which has the least mass?
Electron
Neutron
Nucleus
Proton
42
Periodic Law states that?
Mercury is a liquid at room temperature
Some elements only stay in a liquid state for short periods
Properties change periodically with an elements atomic #
Elements are either gases, solids, or liquids.
43
The law of conservation of energy states that energy cannot be?
Transferred or shared
Created or destroyed
Lost or gained
Changed or made
44
A pure substance that cannot be separated into simpler substances by physical or chemical means
Compound
Element
Suspension
Solid
45
When writing a chemical reaction,_____ are on the left and ____ are on the right?
Chemicals, reactants
Reactants, products
Elements, chemicals
Products, reactants
