Unit 2 study set

What type of reaction releases heat?

• endothermic

• exothermic

In what type of reaction do reactants have more energy than the products?

• endothermic

• exothermic

• chemical

• thermal

what type of reaction feels cold?

• thermal

• chemical

• endothermic

• exothermic

Where are reactants located in a chemical equation?

• left of the arrow

• right of the arrow

• in front of a compound

• the little numbers within a molecule

Where are products located in a chemical reaction?

• left of the arrow

• right of the arrow

• big number in front of a compound

• little number within a molecule

What do we change when balancing an equation?

• subscripts

• coefficients

• reactants

• products

How many hydrogens are in H₂C₂H₃O₂?

• 2

• 3

• 5

• 6

what is the law of conservation of mass?

• mass cannot be created or destroyed, only change forms

• when equilibrium is disturbed, the system shifts to counter the effect

• particles must collide with correct orientation and sufficient energy

Which is the subscript: 4 CaCl₂

• 4

• 2

Which is the coefficient: 4 CaCl₂

• 2

• 4