Activate Q&A cards Y7 Elements, Atoms and Compounds C1.2

Q10. Do single atoms have the same properties as their element?

No, the properties of an element are from very many atoms joined together.

Q6. What is the chemical symbol for hydrogen?

H

Q16. What is the name of the compound formed when aluminium reacts with oxygen?

Aluminium oxide

Q7. What is the chemical symbol for gold?

Au

Q5. What is the chemical symbol for carbon?

C

Q3. What is the name of the famous list of the elements?

The periodic table.

Q22. How many nitrogen atoms are there in an ammonia molecule? NH3

1

Q17. How many carbon and oxygen atoms are there in one molecule of carbon dioxide?

1 carbon atom for every 2 oxygen atoms.

Q23. How many hydrogen atoms are there in a molecule of sulphuric acid? H2SO4

2

Q21. How many atoms of hydrogen are there in a molecule of methane? CH4

4

Q2. How many naturally occurring elements are there?

92

Q9. How many types of atom are there?

92 (same as the number of elements)

Q13. What is a molecule?

A molecule is a group of two or more atoms strong joined together.

Q4. What is a chemical symbol?

A one or two letter code for an element.

Q12. What is a compound?

A substance made up of atoms of two or more elements.

Q1. What is an element?

A substance that cannot be broken down into other substances.

Q11. Why is 1cm3 of gold heavier than 1cm3 of silicon?

Because an atom of gold is heavier than an atom of silicon.

Q14. Why is water different to its elements?

Because water molecules are different to hydrogen and oxygen molecules.

Q15. What is the difference between carbon dioxide and carbon monoxide?

Carbon dioxide is CO2, it is a gas you breath out. and carbon monoxide is CO, it is poisonous.

Q18. What is a chemical formula?

It shows the relative numbers of atoms of each element in a compound.

Q19. How do you write the numbers in a chemical formula?

The elements should be to the right of their chemical symbol, just below the line and smaller than the chemical symbols.

Q8. What is an atom?

The smallest part of an element that can exist.