Intermediate 1 Unit 1b & c Reactions & Bonding 123 4567 89 10 111213 14 15 22 23242526 27 161718192021.

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Presentation transcript:

Intermediate 1 Unit 1b & c Reactions & Bonding

What is always formed during a chemical reaction? A new substance

Give an example of a sign that a chemical reaction is taking place. Colour change, bubbling and fizzing, a solid forming, an energy change

What is precipitation? A solid being formed when two solutions react together.

Give an example of an everyday chemical reaction. Rusting, petrol burning, frying an egg.

How does increasing the temperature affect the speed of a reaction? It speeds it up

Do larger or smaller particles speed up a reaction? Smaller particles?

What effect does decreasing the concentration have on the speed of a reaction? It slows it down

What is a catalyst? A substance which speeds up a chemical reaction

What mass of a catalyst would be left at the end of a reaction if 1g was used. The same - 1g

What is an enzyme? A catalyst which works on living things - a biological catalyst

Carbon dioxide and water are produced when methane burns in oxygen. Write a word equation for this reaction. Methane + oxygen carbon dioxide + water

Water and sodium chloride are formed when hydrochloric acid reacts with sodium hydroxide. Write a word equation for the reaction. Hydrochloric acid + sodium sodium + water hydroxide chloride

What is an element made up of? Atoms

What is the number given to each element called? Atomic number

Are the bonds which hold the atoms together in a molecule strong or weak? Strong

What is an element? A substance made up of identical atoms.

What is a molecule? A group of atoms joined together.

Are the bonds between molecules strong or weak? Weak

Is the bond indicated strong or weak? Strong bond

Is the bond indicated strong or weak? Weak bond

What charge can an ion have? Positive(+) or negative (-)

What are these type of particles called? Ions

Are the bonds between ions strong or weak? Strong

Write the formula for the following molecule. C3H8OC3H8O CCCOH HHH H HHH

Write the formula for sulphur trioxide. SO 3

Write the formula for carbon monoxide. CO

Write the formula for nitrogen dioxide NO 2

Intermediate 1 Unit 1b & c