Chemistry review

What information does a subscript number tell us?

• the number of atoms per element

• the number of molecules per formula

An electron is located ...

• in the nucleus.

• outside the nucleus.

What is the atomic mass for this element?

• 6

• 12.0107

• 6.0107

• 18.0107

What information does the coefficient in an equation give us?

• the number of atoms per element

• the number of molecules per formula

The atomic number of an element is determined by the number of ________ in the nucleus.

• neutrons

• electrons

• protons

• ions

How many total atoms are in the product?

• 10

• 5

• 7

• 12

If the protons and electrons do not match, the atom is...

• A neutral atom

• An ion

• A molecule

• An unbalanced compound

What is the law of conservation of matter?

• Matter changes when reacted or changed.

• The mass of all reactants are changed during a physical or chemical change.

• Matter, and therefore mass, cannot be created nor destroyed, simply rearranged.

• The mass of the products is different than the mass of the reactants.

Which of the following is evidence of a chemical change?

• Change in state

• We can't tell when a chemical change occurs.

• Gas release, or bubbles forming

• Change in shape or size

Identify the elements in this compound.

• Carbon, Helium, Oxygen

• Chromium, Hydrogen, Oxygen

• Calcium, Hydrogen, Oxygen

• Carbon, Hydrogen, Oxygen