8 th Science 12/2013

Question 1

density

Answer 1

the amount of mass per unit of volume

Question 2

The desity of an object is determined by

Answer 2

how tightly packed together the matter is

Question 3

the unity for density is

Answer 3

g/ml or g/cm3

Question 4

anything that takes up space is made of

Answer 4

matter

Question 5

physical properties of a substance

Answer 5

characteristics of the substance such as, color, smell, taste, hardness, state of matter, temperature changes, density, mass, volume, malleability, solubility

Question 6

chemical properties

Answer 6

determined by a substance’s ability to react with other substances such as, water/ acids.
Examples of chemical property - the color of a sunset, the shape of a leaf, the ability of gunpowder to explode.

Question 7

The ability of wood to burn is a ______________ property

Answer 7

chemical

Question 8

The hardness of a diamond is ________________________ property.

Answer 8

physical

Question 9

In a chemical change, what happens to the original substances?

Answer 9

They combine/react to form a new substance

Question 10

examples of what happens in a chemical change:

Answer 10

impossible to reverse.

Question 11

Oxidation creates rust. That’s an example of a _________________ reaction.

Answer 11

chemical

Question 12

When you digest food, that is an example of _______________________ change.

Answer 12

chemical

Question 13

When Ice melts and becomes water, that’s a ____________________ change.

Answer 13

physical

Question 14

Vinegar is mixed with baking soda and releases carbon dioxide gas. That’s a ___________________ reation.

Answer 14

chemical

Question 15

a pencil is sharpened and leaves behind shavings. That’s a __________________ change.

Answer 15

physical

Question 16

Color, shape and texture are ____________________ properties.

Answer 16

physical

Question 17

mass is the amount of _____________________.

Answer 17

matter is the amount of space an object takes up.

Question 18

a person’s weight changes when on the moon, but her ____________________ stays the same.

Answer 18

mass

Question 19

What do you call the method of measuring the mass of irregularly shaped solids? (Think about putting it in water)
What unit is used to measure it?

Answer 19

displacement

mL ( milliliters)

Question 20

endothermic change

Answer 20

a chemical reaction that requires heat

Question 21

exothermic change

Answer 21

chemical reaction in which heat is produced and released into the environment

Question 22

What do we use a spring scale to measure?

Answer 22

weight

Question 23

What do we use to measure mass?

Answer 23

a balance

Question 24

To find an object’s density, first measure its _______________ and _________________. Then use the equation: ____________________

Answer 24

first measure its mass, then volume, then use the formula D=m/V

Question 25

what are the three four states of matter?

Answer 25

solid, liquid, and gas and plasma

Question 26

Is flammability a physical or chemical property?

Answer 26

chemical

Question 27

The properties that are the most useful in identifying a substance are ________________________ properties.

Answer 27

Characteristic properties are most useful in identifying a substance. (Both physical and chemical)

Question 28

Particles of which state of matter (solid, liquid, or gas) move the fastest and are the farthest apart.

Answer 28

gas

Question 29

Which state of matter has a definite shape and volume.

Answer 29

solids

Question 30

Viscosity describes a liquid's resistance to _____________________.

Answer 30

Viscosity is the term that refers to a liquid's resistance to flow. (ex: honey flows much slower than water; it has a higher viscosity)

Question 31

Length x height x width = _________________

Answer 31

volume

Question 32

a form of matter that does not have a definite volume or shape is ____________

Answer 32

gas

Question 33

Erosion of soil is an example of a _________________ change.

Answer 33

physical

Question 34

The ability of an element to be molded or flattened is called

Answer 34

malleability

Question 35

How does a liquid become a solid?

Answer 35

when the temperature is lowered to a liquid's freezing point, it becomes solid

Question 36

What is the SI unit for length?

Answer 36

(m) meter

Question 37

What is the SI unit for volume?

Answer 37

(L) liters | (mL) milliliters

Question 38

What is the SI unit for mass?

Answer 38

(kg) kilograms (g) grams (mg) milligrams

Question 39

What is the SI unit for temperature?

Answer 39

(K) Kelvin | (C) Celsius

Question 40

What tool do scientists use to measure temperature?

Answer 40

thermometer

Question 41

Condensation is the change of state from a ___________________ to a ____________.

Answer 41

from a gas to a liquid

Question 42

The ________________________ is the point at which a liquid boils.

Answer 42

boiling point

Question 43

_______________ is the change from a liquid state to a gas state,

Answer 43

evaporation

Question 44

____________________ is the process in which a solid directly changes into a gas.

Answer 44

sublimation

Question 45

What is the melting point of ice? | What is the freezing point of water?

Answer 45

0 degrees Celsius If energy is added, it melts if energy is removed, it freezes

Question 46

Plasma is different from gas because ____________________________.

Answer 46

The atoms are different. Plasma is made up of positively and negatively charged particles and the electrons are free to move around, rather than bound to the nucleus, as in gasses. Ex: neon lights, the Northern Lights

Question 47

The temperature of a substance is related to the speed of that substance's __________________________.

Answer 47

particles

Question 48

__________________ is added during endothermic changes.

Answer 48

Energy

Question 49

What is different about the movement of particles in a solid vs. a liquid?

Answer 49

The particles move more in a liquid and spread out. In a solid, the particles barely move - just vibrate.

Question 50

chemical properties describe a substance based on its ability to _____________ into a _________________________ substance that has different __________________________.

Answer 50

based on its ability to change into a new substance that has different properties