Chapter 2 Chem

Question 1

Energy

Answer 1

capacity to do work; involved when there is a change in matter

Question 2

Endothermic

Answer 2

energy is going in, energy is absorbed; ex: boiling water

Question 3

Exothermic

Answer 3

energy is released; ex: freezing water

Question 4

Law of Conservation of Energy

Answer 4

during any physical or chemical changes, the total quantity of energy in the system remains constant

Question 5

Heat

Answer 5

energy transferred between objects that are at different temperatures

Question 6

Temperature

Answer 6

the measure of how much kinetic energy moving particles have

Question 7

Kelvin

Answer 7

0 is absolute zero

Question 8

Celsius

Answer 8

0 is waterś freezing point

Question 9

Theory

Answer 9

well-tested explanation

Question 10

Law

Answer 10

a statement that explains behavior in the natural

Question 11

Conclusion

Answer 11

an explanation for one experiment

Question 12

Accuracy

Answer 12

how close measurement is to the accepted amount

Question 13

Precision

Answer 13

how closely several measurements agree

Question 14

Significant figures

Answer 14

all of the digits that are known and an uncertain digit

Question 15

Rules for sig figs

Answer 15

1. all non-zero numbers are significant
2. exact numbers have an infinite number of sig figs
3. conversion factors/ defined numbers have infinite sig figs

Question 16

Rules for zeros

Answer 16

1. zeros appearing between nonzero digits are significant
2. zeros left of all nonzeros are not significant
3. zeros right of a number and decimal are significant
4. zeros at the end of a number but no decimal are not significant

Question 17

rules for sig figs in addition and subtraction

Answer 17

round to the lowest number given from the decimal places

Question 18

rules for sig figs in multiplication and division

Answer 18

round to the lowest number of sig figs that were given