Chapter 6 Flashcards Preview

8th Grade Science > Chapter 6 > Flashcards

Flashcards in Chapter 6 Deck (14):
1

What are the 3 physical properties of water?

- a clear, colorless liquid at room temperature
- boils at 100 degrees Celsius
- freezes at 0 degrees Celsius

2

What are the 3 chemical properties of water?

- Made of hydrogen atoms and oxygen atoms in a 2 to 1 ratio
-Does not burn
- Reacts with some metals

3

What are the 4 things indicating that a chemical reaction has occurred?

1. Change in properties of the materials involved
2. Formation of a gas from solid or a liquid reactants
3. Changes in texture or hardness
4. One or more new substances are produced

4

What is an open system?

A system in which matter can enter from or escape to the surroundings

5

What is a closed system?

A system in which no matter is allowed to enter or leave

6

What are three types of ways to classify chemical reactions?

Synthesis, decomposition, and replacement

7

Define activation energy

The minimum amount of energy needed to start a chemical reaction

8

Define concentration

The amount of a substance in a given volume

9

Define catalyst

A material that increases the rate of a reaction by lowering the activation energy

10

Define enzymes

A biological catalyst that lowers the activation energy of a reaction in cells

11

How is activation energy related to chemical reactions

Oh chemical reactions require a certain amount of activation energy to get started

12

What factors affect the rate of a chemical reaction

Surface area, temperature, concentration, and the presence of catalysts or inhibitors

13

Define inhibitor

A material used to decrease the rate of a reaction

14

Being a colorless, clear at room temperature is a ________ of water

Physical