In an experiment, which factor is manipulated to observe its effect on the dependent variable?

• constant
• dependent variable
• control
• independent variable

What does a chemical formula represent?

• The name of an element
• The structure of a compound
• The reaction between elements
• The group of elements

What is the name of the compound with the formula NaCl?

• chlorine sodiate
• sodium chlorate
• sodium chloride
• sodium dichloride

What is the charge of phosphate in K3PO4?

• 7-
• 3-
• 1+
• 4+

What is the correct name for K2SO4?

• potassium disulfide
• potassium sulfate
• potassium sulfide
• potassium(II) sulfate

What is the correct formula for magnesium oxide?

• MgO
• MgO2
• Mg2O2
• Mg2O

What type of chemical equation has the same number of atoms of each element on each side of the equation?

• balanced
• complex
• simple
• unbalanced

Each substance on the left side of the arrow in a chemical equation is a ____.

• catalyst
• coefficient
• product
• reactant

Which of the following is a balanced chemical equation?

• AgNO3 + NaCl → 4AgCl + 2NaNO3
• 2AgNO3 + 2NaCl → 3AgCl + 2NaNO3
• AgNO3 + NaCl → AgCl + NaNO3
• AgNO3 + 2NaCl → AgCl + 3NaNO3

The energy required to break the original bonds is less than the energy released when new bonds form in a(n) ____ reaction.

• endergonic
• exergonic
• precipitate
• aqueous