7f Bubbles, Bangs And Burnings Flashcards

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1
Q

Chemical reaction occurs when chemicals

A

Join or break apart to form new chemicals

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2
Q

In a physical change

A

No new substances are formed and are usually reversible

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3
Q

Chemical reactions produce

A

A new substance . Mostly a irreversible change

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4
Q

Observations to decide whether a chemical reaction has taken place

A

Change colour
A gas is given off
Fizzing
It gets hotter

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5
Q

Corrosion def and example

A

A metal reaction between a metal and gases in the air for example an oxide layer which often weakens the metal .

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6
Q

How to test for hydrogen

A

Bring a lighted splint to a test tube containing the gas . It will go out with a pop .. called the squeaky pop test

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7
Q

Dry ice is

A

Solid carbon dioxide

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8
Q

To test for carbon dioxide

A

Mix the gas with limewater if it goes milky it is carbon dioxide

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9
Q

Name the reactants and the product in the word equation magnesium plus oxygen arrow magnesium oxide .

A

Magnesium and oxygen are the reactants

Magnesium oxide is the product

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10
Q

Fire triangle consists of three things you need for a fire , what are they

A

Oxygen, heat, fuel

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11
Q

Burning is also known as

A

Combustion

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12
Q

Why is energy not usually written in a chemical reaction

A

As it is not a chemical substance so it is not a product

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13
Q

Carbon and hydrogen reacts to make

A

Hydrocarbon

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14
Q

Methane plus oxygen arrow

A

Carbon dioxide plus water

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15
Q

Methane plus oxygen

A

Arrow carbon monoxide and water

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16
Q

When does a chemical reaction becom an explosion

A

When a large amount of gas is formed
A lot of heat is released
Plenty of oxygen is available