Balanced Symbol Equations Flashcards

1️⃣ Familiarise yourself with the flashcards:

  • Look through all the flashcards to see what's on both sides.
  • Make sure you understand the information on each card. If something's unclear, click the link to the revision notes at the bottom of the page for more details.

2️⃣ Test yourself:

  • Look at the question or prompt on each card and try to remember the answer before flipping it over.
  • Check the answer and make a note of any cards you find challenging and need to go over more.

3️⃣ Consistently Review and Practice:

  • Use spaced repetition: spend more time on the cards you struggle with and go over them more often.
  • Regularly review all the flashcards to help you better understand and retain the information over time.

Note: We may include questions that have multiple correct answers. It's useful to remember specific examples to understand these concepts better.

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What is a symbol equation in chemistry?

A symbol equation uses chemical symbols and formulae instead of words to show a reaction.

What does it mean if a symbol equation is balanced?

It means there are the same number of each type of atom on both sides of the equation.

Why must symbol equations be balanced?

They must be balanced because atoms are not lost or made in a reaction, only rearranged.

In a balanced symbol equation, what do the large numbers in front of formulae show?

They are coefficients and show how many particles or moles of each substance react or are made.

When balancing a symbol equation, are you allowed to change the small numbers in a chemical formula?

No. You must not change the small numbers in a formula; you only change the big numbers in front.

What is the first thing you should do when trying to balance a symbol equation?

First, write down the number of atoms of each element on both sides of the equation.

What should you do if an element has more atoms on one side of a symbol equation than the other?

You should add or change a big number in front of a formula to make the number of atoms the same.

Is the equation H2 + O2 → H2O balanced, and why?

No. There are 2 hydrogen atoms on each side but 2 oxygen atoms on the left and only 1 on the right.

What is the balanced symbol equation for hydrogen reacting with oxygen to form water?

The balanced equation is 2H2 + O2 → 2H2O.

What is the balanced symbol equation for magnesium reacting with oxygen to form magnesium oxide?

The balanced equation is 2Mg + O2 → 2MgO.

How can you check that a symbol equation is balanced?

Count the atoms of each element on both sides. If they are all equal, it is balanced.

What does a balanced symbol equation tell you about the ratio of reacting substances?

It shows the simplest whole number ratio in which the substances react and are formed.