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Chemistry questions
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1
What does the periodic table organize elements by?
Atomic number
Density
Mass number
Color
2
What is conserved in a chemical reaction?
Color
Mass
Volume
Texture
3
Which reaction type is 2H
2
+ O
2
-> 2H
2
O?
Decomposition
Synthesis
Single replacement
Combustion
4
What is a solute?
The substance that does the dissolving
The final mixture
The substance that is dissolved
A gas
5
A solution is a _____ mixture
Heterogeneous
Physical
Homogeneous
Colloidal
6
Which of the following is a qualitative observation?
The mass is 5 grams
The volume is 100 mL
The solution turned blue
The temperature is 25 Celsius degree
7
What is used to organize and analyze scientific data?
Equations
Graphs
Theories
Hypotheses
8
One mole of any substance contains how many particles?
6.02 x 1023
3.14 x 107
9.81 x 108
1.00 x 106
9
Covalent bonds involve the _____ of electrons
Sharing
Gain
Transfer
Loss
10
Which state of matter has a definite volume but no definite shape?
Gas
Plasma
Liquid
Solid
11
What is the branch of chemistry?
Social science
Earth science
Life science
Phsycal science
12
What charge does a calcium ion have?
1+
3+
2+
2-
13
What does a catalyst do?
Raises pH
Slow down a reaction
Speeds up a reaction
Increases mass
14
What particles are found in the nucleus of an atom?
Neutrons and Electrons
Only protons
Electrons
Protons and Neutrons
15
What is the unit for measuring the amount of substance?
Liter
Gram
Mole
Kelvin
16
What law states P1V1 = P2V2?
Gay-Lussac's Law
Charle's Law
Boyle's Law
Avogadro's Law
17
What happens at chemical equilibrium?
Reactants disappear
Forward and reverse rates are equal
Only products reamin
Reactions stop
18
Which of these is a base?
CO2
HCl
NaOH
Vinegar
19
Which state of matter has define shape and volume?
Liquid
Solid
Gas
Plasma
20
Which subatomic particle has a negative charge?
Electron
Proton
Neutron
Nucleus
21
Which state of matter has the most energy?
Solid
Liquid
Gas
Plasma
22
What happens when an electron jumps to a higher energy level?
It forms a bond
It loses mass
It absorbs energy
It releases light
23
Which type of reaction is AB + CD -> AD + CB?
Decomposition
Synthesis
Single replacement
Double replacement
24
Stoichiometry is based on the _____ of a balanced equation.
Coefficients
Volume
Mass
Subscripts
25
Which group on the periodic table contains the noble gases?
Group 18
Group 1
Group 17
Group 2
26
An exothermic reaction ____ heat
Neutralizes
Absorbs
Evaporates
Releases
27
What type of bond forms between a metal and nonmetal?
Ionic
Hydrogen
Metallic
Covalent
28
What does an endothermic reaction do?
Absorbs heat
Releases light
Produce gas
Forms a precipitate
29
What pH value indicates a strong acid?
9
1
7
14
30
What increases reaction rate?
Lower concentration
Larger particles
Higher temperature
Smaller surface area
31
A solution is a ____ mixture.
Heterogeneous
Collidal
Homogeneous
Physical
32
What affects equilibrium according to Le Chatelier's Principle?
Density
Temperature
Color
Molecular mass
33
Which variable is held constant in Charle's Law?
Pressure
Moles
Volume
Temperature
34
What is the maximum number of electrons in the second energy level?
2
6
18
8
35
What is the shape of a water molecule?
Trigonal planar
Bent
Tetrahedral
Linear
36
What type of matter is air?
Compound
Element
Mixture
Solid
37
What is the study of matter and the changes it undergoes?
Biology
Physics
Astronomy
Chemistry
