Periodic Table
Which of the following elements is classified as a metalloid?
a. Sodium
b. Silicon
c. Chlorine
d. Magnesium
b. Silicon
In the chemical formula 2H2O, how many atoms of hydrogen are present?
a. 1
b. 2
c. 3
d. 4
d. 4
What is the law of conservation of mass?
a. Matter can be created or destroyed in chemical reactions
b. The total mass of reactants equals the total mass of products
c. Mass increases during chemical reactions
d. Mass decreases during chemical reactions
b. The total mass of reactants equals the total mass of products
Which of the following is an example of a physical change?
a. Rusting of iron
b. Freezing of water
c. Burning of paper
d. Digestion of food
b. Freezing of water
What is the primary difference between potential energy and kinetic energy?
a. Potential energy is always greater than kinetic energy
b. Kinetic energy is stored energy, while potential energy is energy of motion
c. Potential energy is stored energy, while kinetic energy is energy of motion
d. There is no difference between potential and kinetic energy
c. Potential energy is stored energy, while kinetic energy is energy of motion
3. Which of these elements is considered a rare Earth element and is crucial in the production of strong magnets used in electric vehicles?
a. Iron
b. Copper
c. Neodymium
d. Aluminum
c. Neodymium
How many atoms of each element are in the molecule shown below?
CH4C3H6COCH2
Carbon - 1 + 3 +1 +1 = 6
Hydrogen – 4 + 6 + 2 = 12
Oxygen - 1
In a balanced chemical equation, what must be true?
a. The number of atoms of each element must be equal on both sides
b. The number of molecules must be equal on both sides
c. The number of reactants must equal the number of products
d. The mass of reactants must be greater than the mass of products
a. The number of atoms of each element must be equal on both sides
In a chemical change:
a. The composition of matter remains the same
b. Only the physical properties are altered
c. New substances are formed
d. The change is always reversible
c. New substances are formed
A stretched rubber band possesses which type of potential energy?
a. Chemical potential energy
b. Gravitational potential energy
c. Elastic potential energy
d. Kinetic energy
c. Elastic potential energy
Which property is characteristic of most nonmetals?
a. High electrical conductivity
b. Ductility
c. Malleability
d. Poor heat conduction
d. Poor heat conduction
In the formula 2Ca(OH)2, how many hydrogen atoms are there?
a. 2
b. 4
c. 6
d. 8
b. 4
What happens to atoms during a chemical reaction?
a. They are created or destroyed
b. They change into different elements
c. They are rearranged to form new substances
d. They disappear completely
c. They are rearranged to form new substances
What is a key indicator of a chemical change?
a. Change in shape
b. Change in appearance
c. Change in size
d. Change in temperature
d. Change in temperature
Which energy transformation occurs when a ball rolls down a hill?
a. Kinetic to gravitational potential
b. Elastic potential to kinetic
c. Gravitational potential to kinetic
d. Chemical potential to kinetic
c. Gravitational potential to kinetic
Name the 4 physical properties of a metal.
Ductile
Malleable
Shiny Luster
Good Conductor of heat or electricity
Which of the following formulas contains the most atoms?
a. 3H2O
b. 3C2H4
c. 3N3H4
d. C6H2O4
c. 3N3H4
In a sealed container, iron rusts completely. What happens to the mass of the container and its contents?
a. It increases slightly
b. It decreases slightly
c. It remains exactly the same
d. It doubles
c. It remains exactly the same
Which of the following is NOT typically a sign of a chemical reaction?
a. Formation of a precipitate
b. Change in temperature
c. Production of gas bubbles
d. Change in shape
d. Change in shape
During photosynthesis, plants convert radiant energy into:
a. Thermal energy
b. Kinetic energy
c. Chemical energy
d. Nuclear energy
c. Chemical energy
Which of the following statements are not true about rare earth metals?
a. They are also called Noble Gases
b. They difficult to extract and produce
c. They are also called Lanthanides
d. They are found in the earth crust
a. They are also called Noble Gases
How many total atoms are in the formula 3C2H5 (OH)2?
a. 6
b. 9
c. 33
d. 37
c. 33
If 15g of sodium reacts completely with 5g of chlorine, what will be the mass of the sodium chloride produced?
a. 5g
b. 10g
c. 20g
d. 15g
c. 20g
Which statement about chemical changes is FALSE?
a. They often involve energy changes
b. They result in new substances
c. They are always easily reversible
d. They may produce a color change
They are always easily reversible
In a battery-operated toy, the primary energy transformation is:
a. Chemical to electrical to mechanical
b. Nuclear to electrical to mechanical
c. Thermal to chemical to mechanical
d. Potential to kinetic to chemical
a. Chemical to electrical to mechanical