Chemistry

Question 0

Name the changes in state?

6

Answer 0

Solid ➡️ M e l t i n g ➡️ Liquid

Liquid ➡️ F R e e z I n g ➡️ Solid

Gas ➡️ C r y s t a l l i s a t i o n ➡️ Solid

Solid ➡️ S u b l I m a t I o n ➡️ Gas

Gas ➡️ C o n d e n s a t I o n ➡️ Liquid

Liquid ➡️ V a p o R a t I o n ➡️ Gas

Question 1

The PH number for a acid?

Answer 1

C.

Below 7 = Acidic
Anything over 7 = Base

Question 2

Define a compound?

Answer 2

A thing that is composed of two or more separate elements;

A mixture

Question 3

Define an element?

Answer 3

Each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number; the number of protons in the nuclei of its atoms.

A substance

Question 4

Define a mixture?

Answer 4

A substance made by mixing other substances together

Question 5

Symbol for hydrochloride acid?

Answer 5

HCI

Question 6

Symbol for sulphuric acid?

Answer 6

H2SO4

Question 7

Symbol for nitric acid?

Answer 7

HNO3

Question 8

What colour does the litmus paper turn in acidic solutions?

Answer 8

Red

Question 9

What colour does the litmus paper turn when put in alkaline solutions?

Answer 9

Blue

Question 10

What colour does the litmus paper turn in neutral solutions?

Answer 10

Purple

Question 11

What is the difference between Solid, liquid and gas particles?

Answer 11

S o l I d - particles are tight and do not move

L I q u I d - particles they slide around each other but are still fairly close together

G a s - particles vibrate at high speeds and are spread out

Question 12

How do we count the atoms and elements in a formula?

Answer 12

E l e m e n t s - Using the periodic table

A t o m s - Add the numbers in the formula

Question 13

Symbol for sodium chloride?

Answer 13

Table salt - NaCI

Question 14

Symbol for water?

Answer 14

H20

Question 15

Symbol for carbon dioxide?

Answer 15

C02

Question 16

State the first 20 elements of the periodic table?

Answer 16

H
He
Li
Be
B
C
N
O
F
Ne
Na
Mg
Al
Si
P
S
Cl
Ar
K
Ca

Question 17

What does an atoms atomic number stand for?

Answer 17

Atomic number stands for the ➡️ Protons

Question 18

What does the atomic mass stand for?

Answer 18

Number of protons + number of neutrons

Question 19

Protons =?

Answer 19

Determines what element it is

Question 20

Neutrons =?

Answer 20

Added with Protons is atomic mass

Question 21

Electrons =?

Answer 21

Usually the same number as the protons

Question 22

Parts of an atom?

Answer 22

Protons
Neutrons
Electrons

Question 23

Where are the protons and neutrons found?

Answer 23

Nucleus

Question 24

What is the difference between chemical and physical change?

Answer 24

Physical change ➡️ Rearranges molecules but doesn’t affect their internal structures

Chemical change ➡️ Is any change that results in the formation of new chemical substances. Breaking or making bonds between atoms at the molecular level

Question 25

What charge does a proton have?

Answer 25

+ = positive charge

Question 26

What charge does a electron have?

Answer 26

• = negative

Question 27

What charge does a neutron have?

Answer 27

0 = neutral

Question 28

Solvent meaning?

Answer 28

Able to dissolve other substances

Question 29

Solute meaning?

Answer 29

Dissolves in a solvent

Question 30

Dilute meaning?

Answer 30

Make (a liquid) thinner or weaker by adding water or another solvent added

Question 31

Concentrated meaning?

Answer 31

To make a solution or mixture less dilute

Question 32

Soluble meaning ?

Answer 32

Able to be dissolved

Question 33

Insoluble meaning?

Answer 33

Incapable of being dissolved

Question 34

Filtration method of separating mixtures?

Answer 34

Can be used to separate a solid from a liquid

Passes through the holes in the filter paper but the solid particles are too big and get stuck

Question 35

Evaporating method of separating mixtures?

Answer 35

Separate a dissolved SOLUTE from a SOLUTION