Unit 1

Question 1

give 3 examples of qualitative observations

Answer 1

color, texture, shape, and smell

Question 2

give 3 examples of quantitative observations

Answer 2

length, weight, temperature

Question 3

What is a chemical reaction

Answer 3

atoms rearranging to form a new substance

Question 4

What are some physical changes

Answer 4

mass, state/phase, height

Question 5

what are some chemical changes

Answer 5

color, smell, temp

Question 6

Metals ___ ____ bind with other metals ______

Answer 6

Metals do not bind with other metals alone

Question 6

What is desposisiton

Answer 6

gas-> solid

Question 7

what is sublimation

Answer 7

solid -> gas

Question 8

give an example of an element

Answer 8

iodine

Question 9

give an example of an ionic compound

Answer 9

potassium chromate

Question 10

what makes an ionic compound

Answer 10

chemically bound atoms where at least one element is a metal

Question 11

give an example of a molecular compound

Answer 11

silicon dioxide

Question 12

what makes a molecular compound

Answer 12

chemically bonded non-metals

Question 13

Accuracy:

Answer 13

how close to the correct answer

Question 14

precision

Answer 14

repeated data

Question 15

Alloy:

Answer 15

mixture of 2 or more metallic elements

Question 16

cation

Answer 16

a positively charged ion, i.e. one that would be attracted to the cathode in electrolysis.

Question 17

anion

Answer 17

a negatively charged ion, i.e. one that would be attracted to the anode in electrolysis.

Question 18

what is the difference between a molecular and ionic compound

Answer 18

Molecular compounds are pure substances formed when atoms are linked together by the sharing of electrons, while ionic compounds are formed due to the transfer of electrons

Question 19

ion

Answer 19

an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons

Question 20

350 ml to liters

Answer 20

.35 L

Question 21

32.34 kg to grams.

Answer 21

32,340 g

Question 22

c. 0.0077 meters to cms.

Answer 22

.77 cms

Question 23

a. 0.003

Answer 23

3 x 10^-3

Question 24

b. 754,000

Answer 24

7.54 x 10 ^6

Question 25

Why does an object in water measure at a lower mass than the same object in air?

Answer 25

An object in water measures at a lower mass than the same object in air because the water is exerting force on the object, therefore making it lighter. Even though the object could be more dense than the water, the water would still make the object lighter.

Question 26

If an object floated in water, what does that mean about the object’s density?

Answer 26

If an object floats in water, this means that the object’s density is less than the water’s density.