Science test 22/22/22/22/22/22/22

Question 1

Does color change indicate that a new substance has formed?

Answer 1

Yes

Question 2

Does formation of gas indicate as evidence that a new substance has formed?

Answer 2

Yes

Question 3

Does formation of perciptate indicate as evidence that a new substance has formed?

Answer 3

Yes

Question 4

Does color change indicate as evidence that a new substance has formed?

Answer 4

Yes

Question 5

Does change in state of matter indicate as evidence that a new substance has formed?

Answer 5

No

Question 6

Does dissolving indicate that a new substance has formed?

Answer 6

No, it just changes the state of matter

Question 7

Does increasing the temp indicate that a new substance has formed

Answer 7

Yes

Question 8

What do all chemical changes do

Answer 8

Form new substances

Question 9

What are bubbles evidence of

Answer 9

A gas being formed

Question 10

True or False:
Crystals dissolving is not an indicator of evidence that a new substance was made

Answer 10

True

Question 11

Precipitate is evidence that…

Answer 11

A new evidence has formed

Question 12

What element makes up of most of earth’s atmosphere

Answer 12

Nitrogen (78%)

Question 13

How are elements and compounds different?

Answer 13

A compound is represented by a chemical formula, and elements are represented by a chemical symbol

Question 14

What 3 elements make up most living things on earth?

Answer 14

Carbon, hydrogen, and oxygen

Question 15

The oceans are primary composed of which two elements?

Answer 15

Hydrogen and oxygen

Question 16

The smallest particle of any particular type of matter is known by…

Answer 16

Atom

Question 17

What three elements are most abundant in the plants and animals that make up the biosphere

Answer 17

Oxygen, carbon, hydrogen

Question 18

Compounds are different than elements, because compounds are-

Answer 18

Combinations of 2 or more elements

Question 19

Carbon is considered an element file. Carbon dioxide is considered a compound. This is because carbon dioxide is…

Answer 19

Made of 2 different elements

Question 20

How many elements are in the compound Fe2O3

Answer 20

2

Question 21

What is the best description of an elements?

Answer 21

A substance that cannot be broken down into simpler substances

Question 22

When a precipitate forms it’s evidence that..

Answer 22

A new substance has formed

Question 23

What is an element of a major component of living organisms

Answer 23

Carbon

Question 24

Is water a compound

Answer 24

Yes

Question 25

What is the property of nonmetals?

Answer 25

Low conductivity

Question 26

Which element would be expected to have reactivity similar to that of phosphorous

Answer 26

Nitrogen

Question 27

Why are electrical wires made from metal such as copper and chromium

Answer 27

Metals are good conductors of electricity