Science 1
Science 2
Science 3
100

10g of salt is added into 100g of water. what is the mass of the solution?

110g

100

what is the percentage of salt in seawater?

3.5%

100

what is the percentage of water in seawater?

96.5%

200

apart from sodium chloride? what other salts are present in seawater?

-magnesium chloride

-sodium sulfate

-calcium chloride


200

what is the color of the diamond when one nickel atom is present?

green

200

name the element that is present in pure diamond

carbon

300

is sand considered as solute? why?

no, because it cannot dissolve in solvent

300

10g of sugar was added into 50g of water. what is the mass of the solution?

60g

300

Give an example of solute

- sugar

- salt

400

Define the word solution.

A mixture of solvent and dissolve solute.

400

Name three properties of solutions

1.uniform, or homogeneous, throughout the mixture

2.It is stable and doesn't change over time or settle

3.The solute particles are so small they cannot be separated by filtering

4.The solute and solvent molecules cannot be distinguished by the naked eye

5.It does not scatter a beam of light, transparent.

400

What is the substance that can dissolved in water called?

solute

500

40g of salt was added into 35g of water. some of the salt did not dissolve in the water. Explain why.

Water is saturated

500

What is an example of solvent?

Water

500

◦Complete the sentence below.

◦ 

3.5% of the seawater is salt.

Of this 3.5%, about 68% is _____________ salt

Sodium chloride

600

5g of sugar was added into 55g of water. what is the mass of the solution?

60g

600

What is the symbol for magnesium cholride?

MgCl2

600

◦What is the percentage of water and salt in seawater?

Water – 96.5%

Salts – 3.5%

700

◦What is the element present in a pure diamond?

-Carbon atom only

700

◦What is the symbol for sodium chloride?

NaCl

700

◦What is the colour of the diamond when there is a present of Boron atom?

Blue

800

Calculate the percentage of silver in 850 silver ring.

-850/1000 x 100% = 85%

800

◦What is the name of element that makes the diamond to appear yellow?

-nitrogen

800

How many atom of nitrogen, nickel or hydrogen there is in a green diamond?

one

900

What is the percentage of gold atom in a 24 carat?

100%

900

what does it mean by pure gold bar?

gold bar that has only gold atom

900

◦Complete the sentence below.

Silver is usually marked with the number of parts per _____________.

-1000

1000

What does it mean by the term ‘pure element’?

Every one of its atom is exactly the same and made of just one type of atom.]

1000

◦What does it mean by 18 carat gold?

18 carat gold has 18 parts gold out of 24 gold. The rest are made up of other elements

1000

What are the typical elements used in gold alloy?

Silver and copper.