Chapter 1

Question 1

molecules

Answer 1

two or more atoms are joined together in specific shapes

Question 2

compounds

Answer 2

substance composed of two or more elements

they contain two or more kinds of atoms

Question 3

law of constant composition

Answer 3

element composition of a compound is always the same

Question 4

heterogeneous mixtures

Answer 4

mixtures that don’t have the same composition, properties and appearance

Question 5

homogenous mixtures

Answer 5

mixtures that are uniform throughout

Question 6

intensive properties

Answer 6

these properties do not depend on the amount of sample being examined are useful because many of these properties can be used to identify substances

Question 7

celsius

Answer 7

freezing: 0 degree
boiling: 100 degrees

Question 8

fahrenheit

Answer 8

freezing: 32 degrees
boiling: 212 degrees

Question 9

kelvin

Answer 9

freezing: 273 degrees
boiling: 373 degrees

Question 10

counting sig figs with zeros

Answer 10

zeros between nonzero digits are significant
zeros at the beginning are never significant
zeros at the end are significant if the number contains a decimal point

Question 11

counting sig figs when add/subtracting

Answer 11

use the same number of decimal places as the one with the fewest decimal places

Question 12

counting sig figs when multiplying/dividing

Answer 12

counting sig figs when multiplying/dividing

Question 13

extensive properties

Answer 13

depend on the amount of sample

relate to the amount of substance present