Science - Chapter 9.4, 10.1, 10.2

Acids react with some metals. What are produced during reactions?

a salt and hydrogen

How can we test for hydrogen?

by placing a burning splint over a test tube containing hydrogen

What will happen if you place a burning splint over a test tube containing hydrogen?

The hydrogen will burn with a ‘pop’ sound

When some metals react with acids, its size decreases slightly. What do we call this phenomenon?

corrosion

Fill: besides reacting with metal, acids also react with __________ __________.

calcium carbonate

What building materials contain calcium carbonate?

marble and limestone

What is produced when a carbonate reacts with an acid?

a salt, carbon dioxide, water

Fill: Sensitivity is the ability to detect and respond to ___________.

stimuli

What body parts can stimuli be detected with?

sense organs

Fill: In each sense organ there are ___________ __________ _______ for detecting stimuli.

specialised sensory cells

Fill: When the specialised sensory cells detect a stimuli, they send _____ __to the__ ___ __through__ ____ __to produce a__ _______.

signals, brain, nerves, sense

In the formation of an image in the eye, when we look at an object, where does the light from the object enter our eyes from?

the cornea

In the formation of an image in the eye, the cornea, lens and the jelly-like fluid helps focus (bend) light onto the where?

retina

In the formation of an image in the eye, a sharp and _________ image is formed on the retina.

inverted

What kind of human activity releases a lot of air pollutants including sulphur dioxide and nitrogen oxides?

the burning of fossil fuels

What kind of air pollutants does the burning of fossil fuels release?

sulphur dioxide and nitrogen oxides

Fill: when acidic gases are released into the atmosphere, they dissolve into water droplets and then _______ __acid and__ _______ acid are produced respectively.

nitric, sulphuric

Fill: Acid rain __________ metal objects such as iron fences, bridges and motor car bodies.

corrodes

How does acid rain damage plants?

The plants die as they cannot carry out photosynthesis, acid rain also increases the acidity of the soil

How does acid rain cause harm to aquatic life?

It increases the acidity of the water