Chemistry Quiz

Question 1

Element

Answer 1

A substance that can’t be broken down any further + made of one kind of atom (negative)

Question 2

What are the most common elements of life in the human body?

Answer 2

1) Oxygen
2) Carbon
3) Hydrogen
4) Nitrogen

Question 3

Elements can chemically combine to form what?

Answer 3

Pure chemical substances

Question 4

Compound

Answer 4

A chemical substance of 2 or more elements that chemically combine together in a specific ratio

Question 5

Mixture

Answer 5

a physical combination of two or more diff. chemical substances

Question 6

What is the difference between compound and mixture?

Answer 6

Elements and compounds are pure chemical substances and mixtures are not.

Question 7

Molecules

Answer 7

A group of elements joined together

Question 8

Atom

Answer 8

smallest unit of matter made of subatomic particles

Question 9

How are electrons important in bonding?

Answer 9

They determine the bonding pattern of an atom. Atoms interact with other atoms to create a full outermost shell of electrons. An atom either gives up or receives electron to obtain a full outer shell.

Question 10

Combustion

Answer 10

a chemical process that involves the rapid combination of a substance with oxygen to produce heat and light

Question 11

What do you need in order for combustion to take place?

Answer 11

1) air
2) gas

Question 12

What type of reaction is combustion?

Answer 12

exothermic

Question 13

Chemical reaction

Answer 13

The process that leads to the change of one set of chemical substances into another (it is a chemical change)

Question 14

Reactants

Answer 14

The substances that undergo the transformation

Question 15

Products

Answer 15

The substances that form during a chemical reaction

Question 16

What are some clues that help you indicated whether a chemical reaction is taking place?

Answer 16

• precipitation forms
• burst of light/ sparks
• temp changes
• bubbles appearing
• odor develops
• color chnages

Question 17

Chemical bond

Answer 17

an attraction between atoms that form a molecule

Question 18

What type of electrons are better to make chemical bonds?

Answer 18

outermost shell electrons

Question 19

In a chemical equation which comes first, reactants or products?

Answer 19

Reactants –> Products
Reactants come first
(search it up for more info)

Question 20

What symbol in a chemical equation is used to show the state of matter of each substance?

Answer 20

Parenthesis (to the right of the chemical formula of each substance)

Question 21

Matter

Answer 21

made of elements, has mass and takes up space

Question 22

Ion

Answer 22

a charged atom that has lost or gained electrons to create a full outermost shell

Question 23

Ionic Bond

Answer 23

It occurs when negatively charged and positively charged ions are attracted to each other

Question 24

Hydrogen Bonding

Answer 24

The attraction between the hydrogen of one water molecule and the oxygen of another water molecule holds water together

Question 25

Solution

Answer 25

solute and solvent combined = slat water

Question 26

solute

Answer 26

dissolving agent = water

Question 27

Aqueous solution

Answer 27

Any solution in which the solvent is water

Question 28

pH scale

Answer 28

The acidity of a solution is measured on a pH scale

Question 29

Acids

Answer 29

Releases H+ in the solution, pH = less that 7

Question 30

Bases

Answer 30

Accepts H+ from solution, pH greater than 7

Question 31

Buffers

Answer 31

regulate changes in pH by binding or releasing H+