Topic 1 - Key Concepts in Chemistry Flashcards Preview

GCSE Chemistry Edexcel Grade 9-1 course > Topic 1 - Key Concepts in Chemistry > Flashcards

Flashcards in Topic 1 - Key Concepts in Chemistry Deck (15)
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1

What are the molecules on the right-hand side of a word equation called?

The products

2

What are the molecules on the left-hand side of a word equation called?

The reactants

3

What does (s) mean?

Solid

4

What does (l) mean?

Liquid

5

What does (g) mean?

Gas

6

What does (aq) mean?

Aqueous (dissolved in water)

7

What is the chemical formula of chlorine?

Cl₂

8

What is the chemical formula of ammonia?

NH₃

9

What is the ammonium ion's formula?

NH₄+

10

What is the nitrate ion's formula?

NO₃ -

11

What is the sulfate ion's formula?

SO₄² -

(The ion charge is 2- )

12

What is the hydroxide ion's formula?

OH-

13

What is the carbonate ion's formula?

CO₃²-

(The ion charge is 2- )

14

what is an ionic equation?

an equation when only the reacting particles (and the products they form are included). You can write an ionic equation for any reaction involving ions in solution.

15

how do you write an ionic equation?

you write a balanced symbol equation and take out any aqueous ions which are present on both sides of the equation (they haven't reacted or been changed.)

step 1: write the full balanced symbol equation

step 2: anything that's ionic and aqueous will break up into its ions in solution so write the equation showing all the aqueous ions separately.

step 3: to get the ionic equation cross out anything which is the same on both sides of the equation (is the same and hasn't reacted/been changed.)

step 4: write out the ionic equation without the ions you crossed out, the overall charge should be the same on both sides.