chps 1 + 2 test

Question 1

chemistry

Answer 1

the study of the composition and structure of matter and the changes they undergo

Question 2

scientific discoveries are discovered by blank

Answer 2

accident or through the scientific method

Question 3

scientific method

Answer 3

observe- collecting data, experimenting, communicating

theory- theories are always tested

test- test and theories can go back and forth, sometimes you have to go back to observe and get more/new data

Question 4

metric system

Answer 4

length- meter
mass- gram
volume- liter. m3, 1 cm3 = 1 ml
temperature- °C (celsius
time- seconds

Question 5

accuracy vs precision

Answer 5

accuracy- refers to closeness to the accepted value (correct answer)

precision- refers to agreement among values, refers to the sensitivity of a measuring device

Question 6

density

Answer 6

a measure of how tightly packed the particles of a sample are

Question 7

percent error goal

Answer 7

<5% error

Question 8

chemical change

Answer 8

any process that results in a new substance with different properties

reactant—>product

Question 9

reactant

Answer 9

the substance that enters into a chemical reaction

Question 10

product

Answer 10

the substance formed by the chemical reaction. products have different properties than reactants

Question 11

physical vs chemical change

Answer 11

physical change is where a substance’s (or material’s) form can change but the properties it is made up of will not. chemical change is where a substance’s properties it is made up of change (the form of the substance can also change)

Question 12

indicators of chemical change

Answer 12

• unexpected color change
• a gas is released
• energy is released or observed
• formation of a precipitate

Question 13

formation of a precipitate

Answer 13

mix two liquids and get a solid

Question 14

exothermic reaction

Answer 14

• release energy

- feel hot

Question 15

endothermic reaction

Answer 15

• absorb energy

- feel cold

Question 16

heat

Answer 16

the energy that flows from a warmer object to a cooler object

Question 17

temperature

Answer 17

how hot or cold an object is

Question 18

specific heat

Answer 18

the heat required to raise the temperature of the unit mass of a given substance by a given amount

Question 19

intrinsic vs extrinsic

Answer 19

intrinsic- does not depend on the amount (ex: temperature, color)

extrinsic- does depend on the amount (ex: heat, mass)