Elements and Compounds

Question 1

Atom

Answer 1

The smallest part of an element that can exist

Question 2

What is an element?

Answer 2

A substance that cannot be broken down into simpler substances by chemical means.

Question 3

What is a compound?

Answer 3

A substance formed when two or more elements are chemically bonded together.

Question 4

True or False: Water (H2O) is a compound.

Answer 4

True

Question 5

Fill in the blank: _____ are composed of only one type of atom.

Answer 5

Elements

Question 6

What are the two main types of substances in chemistry?

Answer 6

Elements and compounds

Question 7

What is the smallest unit of an element?

Answer 7

An atom

Question 8

True or False: Compounds can be separated by physical means.

Answer 8

False

Question 9

What do we call a mixture of two or more elements that are not chemically bonded?

Answer 9

A mixture

Question 10

What is the main difference between an element and a compound?

Answer 10

An element consists of one type of atom, while a compound consists of two or more different atoms bonded together.

Question 11

What is the chemical formula for carbon dioxide?

Answer 11

CO2

Question 12

Fill in the blank: The _____ of an element is the number of protons in its nucleus.

Answer 12

atomic number

Question 13

Which of the following is a compound? (A) Fe (B) O2 (C) H2O

Answer 13

C) H2O

Question 14

What is the term for a substance made from two or more different elements that are chemically combined?

Answer 14

Compound

Question 15

True or False: All compounds are made of two or more different elements.

Answer 15

True

Question 16

What is the process called when compounds are formed?

Answer 16

Chemical bonding

Question 17

Fill in the blank: The _____ is the basic building block of matter.

Answer 17

atom

Question 18

Which element has the chemical symbol ‘K’?

Answer 18

Potassium

Question 19

What is the difference between an ionic bond and a covalent bond?

Answer 19

An ionic bond involves the transfer of electrons, while a covalent bond involves the sharing of electrons.

Question 20

True or False: Elements can exist as solids, liquids, or gases.

Answer 20

True

Question 21

What is the chemical formula for methane?

Answer 21

CH4

Question 22

What is a molecule?

Answer 22

Two or more atoms bonded together.

Question 23

Fill in the blank: _____ are substances that can conduct electricity when dissolved in water.

Answer 23

Ionic compounds

Question 24

Which of the following is a property of metals? (A) Brittle (B) Conductive (C) Non-malleable

Answer 24

B) Conductive

Question 25

What is the term for the chemical reaction where compounds are broken down into simpler substances?

Answer 25

Decomposition

Question 26

True or False: Oxygen is an element that supports combustion.

Answer 26

True

Question 27

What is the chemical formula for sulfuric acid?

Answer 27

H2SO4

Question 28

Fill in the blank: A _____ is a pure substance that cannot be separated into simpler substances by chemical means.

Answer 28

element

Question 29

Which element has the atomic number 1?

Answer 29

Hydrogen

Question 30

What do we call a substance that is made of only one type of atom?

Answer 30

Element

Question 31

What is the term for the attraction between atoms that allows them to form compounds?

Answer 31

Chemical bond

Question 32

True or False: All compounds have different properties than the elements that make them up.

Answer 32

True

Question 33

What is the chemical formula for glucose?

Answer 33

C6H12O6

Question 34

Fill in the blank: The _____ of a compound determines its properties.

Answer 34

structure

Question 35

Which of the following is a property of nonmetals? (A) Good conductors of heat (B) Dull appearance (C) Malleable

Answer 35

B) Dull appearance

Question 36

What is the primary component of air?

Answer 36

Nitrogen

Question 37

What is an alloy?

Answer 37

A mixture of two or more metals.