chapter 7 to page 251

Question 1

What is matter

Answer 1

matter is anything that has mass and volume

Question 2

What is mass

Answer 2

mass is the quantity of matter that a substance or object contains

Question 3

What happens when there is more matter?

Answer 3

more matter = greater mass

Question 4

How is mass measured?

Answer 4

mass is measured in g grams or kg kilograms

Question 5

What is volume?

Answer 5

volume is the amount of space taken up by a substance or object

Question 6

How is volume of liquid measured?

Answer 6

liquid is measured in mL mililitres or L litres or cm3

Question 7

what is the definition of solid?

Answer 7

a solid has a definite shape and volume

Question 8

what is the definition of liquid?

Answer 8

liquid has a definite volume but its shape is determined by the surroundings (container)

Question 9

What is the definition of gas?

Answer 9

gas has volume and shape is determined by its surroundings (gas in a balloon)

Question 10

What are the four parts of the particle model of matter?

Answer 10

1. matter is made of small particles, 2. there are spaces between particles, 3. particles are always moving, 4. particles are attracted to each other

Question 11

What do the particles in a solid look like?

Answer 11

packed together tightly, hold shape, don’t appear to move but vibrate

Question 12

What do the particles in liquid look like?

Answer 12

particles are in contact with each other, but slip and slide past each other changing shape

Question 13

What do the particles in gas look like?

Answer 13

large spaces between each other, mostly empty space, can move freely in any direction

Question 14

What is kinetic energy?

Answer 14

kinetic energy is the energy of motion

Question 15

What is kinetic molecular theory?

Answer 15

explains what happens to matter when the kinetic energy of a particle changes

Question 16

In science what is a model?

Answer 16

a model is a way to think about and interpret natural events and objects.

Question 17

What is a theory?

Answer 17

a theory provides a scientific explanation based on the results of an experiment

Question 18

What is thermal expansion?

Answer 18

when particles heat up they move faster, and the substance expands

Question 19

What is thermal contraction?

Answer 19

when particles are cooled and they slow down, the substance gets smaller

Question 20

do all substances expand and contract at the same rate when heated or cooled?

Answer 20

No, each substance responds differently to heat/cold.

Question 21

What causes a glass to break in hot water?

Answer 21

the uneven contraction causes stress which breaks the glass

Question 22

Why doesn’t lab glass break then?

Answer 22

lab glass is made of different substances so that it doesn’t shatter in heat.

Question 23

What is thermal energy?

Answer 23

the total kinetic energy of all the particles of a substance.

Question 24

What happens when two substances have different thermal energies and they come into contact?

Answer 24

the thermal energy flows to the substance with less thermal energy.

Question 25

What is a temperature reading?

Answer 25

you are sampling the kinetic energy of its particles