Science Exam 3.0

Question 0

Types of reactions

Answer 0

1. • synthesis reaction
2. • decomposition reaction
3. • displacement reaction

Question 1

What is a chemical reaction??

Answer 1

A chemical reaction is a process where a set of substances undergo a chemical change to form a different substance

Question 2

What is a synthesis reaction??

Answer 2

Synthesis reaction is one where two substances combined to make a new substance. It can be shown in an equation such as A+B=AB.

Question 3

What is decomposition reaction??

Answer 3

A decomposition reaction is where a complex substance breaks down to form two separate substances. It can be shown in an equation such as AB= A+B

Question 4

What is displacement reaction??

Answer 4

A displacement reaction is where elements or compounds are displaced to make new substances

Question 5

Examples of synthesis reaction

Answer 5

Water: 2H2 + O2= 2H2O

Carbon dioxide: 2CO + O2= 2CO2

A+B=AB

Question 6

Examples of decomposition reaction

Answer 6

CaCO3= CaO + CO2

AB= A+B

2KCIO3= 2KCI + 3O2

Question 7

Examples of displacement reaction

Answer 7

AC+BD=AB+CD

Mg+2HCI=MgCI+H2

Question 8

What is a mixture?

Answer 8

A mixture is a combination of two substances or more

Question 9

Types of mixtures

Answer 9

Homogeneous and heterogeneous mixtures

Question 10

What is an homogenous mixture??

Answer 10

Is a mixture where the components are not visible

Question 11

What is heterogeneous mixture??

Answer 11

A mixture where the components are visible sometimes

Question 12

Homogeneous examples

Answer 12

Soda medicine cupcake etc.

Question 13

Heterogeneous examples

Answer 13

Salad pizza taco soup etc.

Question 14

Separation methods

Answer 14

For homogeneous mixtures distillation and evaporation

For heterogeneous mixtures evaporation filtration decantation magnetic separation

Question 15

Distillation

Answer 15

Is the technique of heating a liquid to create vapor which is collected

Question 16

Evaporation

Answer 16

The process by which molecules undergo a spontaneous transition from liquid to gas

Question 17

Filtration

Answer 17

Is a mechanical or physical process to separate solid from Fluids particulates

Question 18

Decantation

Answer 18

Separate particulates from a mixture by allowing the solids settle to the bottom

Question 19

Magnetic separation

Answer 19

Is a process in which magnetically material is extracted from a mixture using magnetic force

Question 20

What is force??

Answer 20

We understand force as a Vector which is a physical quantity with size and direction

Question 21

The forces are

Answer 21

Friction gravity normal force tension muscular force

Question 22

Friction

Answer 22

In which a moving object can be slow down by air water or any surface the object moves upon

Question 23

Gravity

Answer 23

In which a mass is attracted to another

Question 24

Normal force

Answer 24

Made by any surface on objects standing on it

Question 25

Tension

Answer 25

Which is the force a rope makes when it’s tensioned

Question 26

Muscular force

Answer 26

The force made by muscles when an exercise is done

Question 27

Speed

Answer 27

A vector representing a change of position

Question 28

Reaction

Answer 28

The opposite force to any action

Question 29

Dynamometer

Answer 29

The instrument to measure force

Question 30

Direction

Answer 30

Where a vector goes

Question 31

Friction

Answer 31

The force that creates resistance between surfaces

Question 32

Action

Answer 32

The force that acts up on itself

Question 33

Acceleration

Answer 33

Vector representing changes of speed

Question 34

Newton’s first law

Answer 34

An object in move stays at move unless an outside force acts upon it
An object in rest stay at rest unless an outside force acts upon it

Question 35

Newton’s second law

Answer 35

To move a mass you need a force

F=ma

Question 36

Newton’s third law

Answer 36

Every action has an equal and opposite reaction

Question 37

What is inertia

Answer 37

Inertia is a property of matter