unit 1

Question 1

four part definition of chemistry

Answer 1

study of matter, its structure/properties, its reaction with other matter, and the energy involved with those reaction

Question 2

what is matter?

Answer 2

anything that mass and takes up space

Question 3

what is mass?

Answer 3

the amount of matter

Question 4

what is the law of conservation of matter?

Answer 4

matter cannot be created or destroyed; the total amount stays constant

Question 5

what is the law of conservation of energy?

Answer 5

energy cannot b created or destroyed; the total amount remains constant

Question 6

examples experiment of law of conservation of matter/energy

Answer 6

methane bubbles demo/ whoosh bottle

Question 7

what is a chemical reaction/change?

Answer 7

a change when one or more substances are converted into different substances

Question 8

what are 7 indicators of a chemical reaction?

Answer 8

rusting, combustion, fermentation, metabolism, color change, change is state, change in temp, production of light

Question 9

what is a homogeneous mixture?

Answer 9

a mixture with the same proportion of components throughout (salt and water)

Question 10

what is a heterogeneous mixture?

Answer 10

a mixture WITHOUT the same proportion of components without (water and sand)

Question 11

what is a compound?

Answer 11

a substance that is made from atoms of two ormolu elements that are chemically bonded

Question 12

element

Answer 12

a pure substance made of only one type of atom

Question 13

what are four techniques for separating mixtures?

Answer 13

filtration, crystallization, chromatography, and distillation

Question 14

what are physical properties?

Answer 14

a characteristic that can be observed

Question 15

what are examples of a physical property?

Answer 15

density, boiling point, melting point, color, conductivity, hardness, odor, malleable, mass, length, volume, area

Question 16

what is a chemical property?

Answer 16

relate to a substances ability to undergo changes that transform it into another

Question 17

what are examples of a chemical property?

Answer 17

charcoal burns in air, sodium metal reacts with water, iron rusts

Question 18

what is an intensive physical property?

Answer 18

properties that do NOT depend on the amount of the substance

Question 19

what are examples of an intensive property?

Answer 19

density, boiling point, melting point, color, conductivity, odor, malleable

Question 20

what is an extensive property?

Answer 20

properties that depend on the amount of substance present

Question 21

what are examples of an extensive property?

Answer 21

mass, length, volume, area

Question 22

what are the four rules for sig figs?

Answer 22

nonzero digits are significant, zeros between nonzero digits are significant, final zeros (after the decimal point) are significant, zeros appearing in front of nonzero digits or at the end of a number are not significant