chemistry - extra

Question 1

Explain the difference between melted suger and a suger solution

Answer 1

Melted sugar is heated up
sugar solution is sugar that has been mixed with a solvent eg water

Question 2

When a soluble substance is shaken with water, does it go clear or cloudy?

Answer 2

Clear

Question 3

Are all or some chloride chemicals very soluble?

Answer 3

all

Question 4

Are all or some of the carbonate chemicals soluble

Answer 4

some

Question 5

Why is filtration needed for drinking water?

Answer 5

Removes water impurities

Question 6

How do you separate mixture from water

Answer 6

Evaporation

Question 7

What is it called when you make new substances?

Answer 7

Chemical reaction

Question 8

What gas is lighter than air?

Answer 8

Hydrogen

Question 9

what’s the scientific word for burning?

Answer 9

Combustion

Question 10

why does a candle go out?

Answer 10

there’s no oxygen left

Question 11

What chemical is in alcoholic drinks and can be made from plants?

Answer 11

Ethanol

Question 12

What powers rocket ships?

Answer 12

hydrogen

Question 13

Why don’t we say wind is a fuel?

Answer 13

It doesn’t power anything

Question 14

What was the fuel you burned in the plasticine experiment?

Answer 14

wood (a splint)

Question 15

What are some important fuels in oil?

Answer 15

Petrol, diesel and kerosene

Question 16

whats another word for fossil fuels

Answer 16

Finite or non- renewable

Question 17

What type of living thing is coal made from

Answer 17

Plant

Question 18

What type of living thing is oil made from?

Answer 18

Dead sea creatures

Question 19

why is coal often found under ground?

Answer 19

Coal is made from swamps and plants and they got buried over the year’s

Question 20

Why is oil often found under the seabed

Answer 20

because the dead sea creatures sank to the bottom of the ocean and recovered in sand

Question 21

What reaction happens in a diesel engine

Answer 21

diesel + oxygen = water + carbon dioxide

Question 22

What effect does carbon dioxide have on the world?

Answer 22

global temperature rises

Question 23

what is the greenhouse effect?

Answer 23

Heat gets trapped near Earth’s surface known as greenhouse gases creating warmth to the planet

Question 24

When a fossil fuel is burned, more of what is released into the air?

Answer 24

Carbon dioxide

Question 25

What’s an advantage for a hydrogen powered car?

Answer 25

It’s not polluting the air (no carbon dioxide)

Question 26

how much alcohol should men drink per week and per day?

Answer 26

No more than
week: 21 units
day: 4 units

Question 27

how much should woman drink per week and per day?

Answer 27

No more than
week: 14 units
day: 3 units

Question 28

Why do we count alcohol in units rather than in percentage?

Answer 28

so it’s easier to know how long it will take for the alcohol to leave your system

Question 29

A substance was stirred into water and the water went cloudy, the substance is:

Answer 29

Insoluble