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Question 1

Matter

Answer 1

Anything that has mass and takes up space

Question 2

Atom

Answer 2

The smallest chemical unit of matter

Question 3

Molecule

Answer 3

Two or more atoms linked together to make a substance with unique properties

Question 4

Mixture

Answer 4

A substance that contains different compounds and/or elements

Question 5

Physical change

Answer 5

A change in which the atoms or molecules in a substance stay the same

Question 6

Chemical change

Answer 6

A change that affects the type of molecules or atoms in a substance

Question 7

What do you call the temperature at which.........
A. A heated liquid becomes a gas
B. A heated solid becomes liquid
C. Gas cools into a liquid
D. A liquid cools into a sold

Answer 7

A. boil point
B. melt point
C. condense point
D. freeze point

Question 8

Atoms of the same element behave in a similar way.

Answer 8

True

Question 9

All atoms of the same element have the same number of…..

Answer 9

Protons

Question 10

Refer back to the periodic table to find out how many protons and electrons are in a single atom of…Li, CI, AU

Answer 10

Li has 3 protons and 3 electrons
CI has 17 protons and 17 electrons
AU has 79 protons and 79 electrons

Question 11

What are two types of bonding between atoms?

Answer 11

Covalent bond and ionic bond

Question 12

How are covalent and ionic bond different.

Answer 12

The covalent bond has atoms that share electrons.

The ionic bond has ions that are attracted to each other

Question 13

Identify each as a chemical or a physical change

a. shredding paper
b. burning paper
c. mixing a glass of lemonade
d. cooking an egg
e. freezing liquid water into ice

Answer 13

a. physical (changes size)
b. chemical (rearranges atoms into new substances)
c. physical (dissolving–still has properties of lemon and salt and water)
d. chemical(changes properties of the substance)
e. physical(change in states of matter–molecule is still H20)

Question 14

Name to natural polymers and two synthetic polymers.

Answer 14

Two natural polymers:cellulose, DNA, keratin in hair.

Two examples of synthetic:plastics made form oil– like rubber ducks and balloons.

Question 15

Acid or base: Taste sour, feel slippery to the touch, Donate hydrogen ions, taste chalky or bitter, conduct electricity in water, Receive hydrogen ions.

Answer 15

Acid– taste sour, donate hydrogen ions, conduct electricity in water
Base–Feel slippery to the touch, taste chalky or bitter, receive hydrogen ions.