Reactions Flashcards

1
Q

How do you tell if something is a chemical reaction?

A

Bubbles, rusting, colour change, baking and burning are types of chemical change. Chemical changes make new substances whereas physical changes usually involve a change of state.

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2
Q

How do you tell if something is a physical change?

A

Dissolving, freezing, cutting, melting and boiling are physical changes.

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3
Q

What happens to the particles in a chemical reaction?

A

The particles are rearranged to produce a new substance.

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4
Q

What are catalysts?

A

They help speed up the rate of a reaction.

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5
Q

What are the reactants and products in the equation:

Magnesium + Oxygen —> Magnesium Oxide

A

Magnesium and oxygen are the reactants. Magnesium oxide is the product.

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6
Q

What is a fuel?

A

A material that releases energy in the form of heat such as coal, oil and gas.

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7
Q

What is combustion?

A

Combustion is another word for burning.

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8
Q

What is the equation for burning?

A

Fuel + Oxygen —> Carbon Dioxide + Water

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9
Q

What is thermal decomposition?

A

When a chemical substance breaks down (decomposes) due to heat into at least 2 chemical substances.

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10
Q

What are the products of the decomposition of calcium carbonate?

A

Calcium oxide and carbon dioxide.

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11
Q

What is the law for the conservation of mass?

A

Mass of Reactants = Mass of Products

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12
Q

What do exothermic reactions show?

A

An increase in temperature, for example burning fuels. It makes the surroundings warmer by taking heat from the object and transferring it to the surroundings.

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13
Q

What do endothermic reactions show?

A

A decrease in temperature for example sports ice packs. They make the surrounding colder by taking heat from the surroundings and transferring it to the object.

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14
Q

What is the law of conservation of mass?

A
  • Mass is never gained or lost in a chemical reaction.
  • When a reaction happens, the atoms in the chemicals are rearranged into different compounds. No new atoms are created and no atoms can disappear.
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15
Q

What are the 3 things in the fire triangle?

A

Oxygen, fuel, heat (ignition).

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16
Q

What do fuels react with to produce energy in an exothermic reaction?

17
Q

What is reduction?

A

When oxygen is removed from a chemical in a reaction.

18
Q

What is oxidation?

A

When oxygen is added to a chemical in a reaction.

19
Q

Which 3 metals do not react with oxygen and why?

A

Silver, gold and platinum because they are lower down in the reactivity series.

20
Q

What is the word equation for the combustion of methane?

A

Methane + Oxygen –> Water + Carbon Dioxide

21
Q

What is metal carbonate?

A

A compound which contains metal (Ca, Cu, Mg), carbon and oxygen. Eg: CuCO3, CaCO3.

22
Q

What is a foam extinguisher used for?

A

It is to be used on class A and class b fires and it removes the parts heat and oxygen from the fire triangle.

23
Q

What is a water extinguisher used for?

A

It is to be used on class A fires and it removes the part heat from the fire triangle.

24
Q

What is a CO2 extinguisher used for?

A

It is to be used on class B fires and it removes the part oxygen from the fire triangle.

25
Q

What is a powder extinguisher used for?

A

It is to be used on class A, class B and class C fires and it removes the part oxygen from the fire triangle.

26
Q

What are class A fires?

A

Fires involving freely burning materials like wood, paper, textiles and other carbon-based materials.

27
Q

What are class B fires?

A

Fires involving flammable liquids such as oil, alcohol, gasoline, ether and grease which are best extinguished by smothering.

28
Q

What are class C fires?

A

Fires involving flammable gases such as butane, propane, ethane and hydrogen. They can be highly explosive if ignited.

29
Q

What are class D fires?

A

Fires involving combustible materials such as titanium, lithium, magnesium and potassium.