Digital Lesson 3.4

Question 1

Chemical formula and chemical equation

Answer 1

Combination of chemical symbols and numbers to represent a substance. A chemical equation is symbols that shows the relationships between reactants and products

Question 2

Exothermic and endothermic

Answer 2

Exothermic: energy released
Endothermic: requires energy

Question 3

Law of conservation mass and energy

Answer 3

Law of conservation mass: mass can’t be created of destroyed
Law of conservation energy: energy can’t be created or destroyed

Question 4

Chemical reaction

Answer 4

When atoms are rearranged and chemical bonds are broken to produce a chemical change of a substance

Question 5

Precipate

Answer 5

Solid that forms into s solution

Question 6

Endothermic and exothermic examples

Answer 6

Exothermic: burning, hand warmers, glow sticks
Endothermic: photosynthesis, water softener, and cold packs

Question 7

How can high temps increase rate of reaction

Answer 7

Increase movement of particles

Question 8

How can increasing the surface area increase the rate of reaction

Answer 8

More particles of the reactants are exposed to one another

Question 9

How will increasing the concentration of reactants speed up a chemical reaction

Answer 9

More particles of reactants which means more collisions

Question 10

Catalyst

Answer 10

Substance that increases the rate of a chemical reaction

Question 11

Coefficient

Answer 11

Used to balance equations; indicated the number of particles of a given substance present in a reaction

Question 12

Steps in balancing an equation

Answer 12

Count atoms in reactants and products. Next add the coefficient in front of the chemical formulas to balance the equation

Question 13

Which changed speed up a reaction

Answer 13

Breaking up solids, adding a catalyst

Question 14

Reactant and product

Answer 14

Reactant is a substance that participated in a chemical reaction. A product is a substance that forms in a chemical reaction