Gr.7 Chemistry Ch.9 quiz -3 2/11/2021

2. Which of these statements about elements is true?

• an element cannot be split up into simpler substances by chemical reactions.

• an element is split up into simpler substances by physical process.

• an element can be split up into simpler substances by chemical reactions

3. Who introduced the symbols we use in chemistry today?

• Lavoisier

• H Davy

• Jon Jakob Berzelius

4. What is the symbol for sodium?

• Na

• NA

• S

• so

1. What are the two elements that join together to produce water?

• Hydrogen & osmium

• Helium & oxygen

• Hydrogen & oxygen

How many Hydrogen are in 4H₂O?

• 6
• 8
• 2
• 4

Which of the following is true? 

• Na is a gas
• Cl combusts when put in water
• NaCl is very different than Na and Cl
• Cl is a metal

8. The old name of potassium is .....................................

• Ketone

• Kalium

• Potash

• Potassium

9. The symbol for potassium is ______

• Po

• P

• K

• k

10. The Latin name of iron is ____________

• Ferrum

• Forum

• Ferrous

• Heamatite

11. Symbol for iron is______

• FE

• I

• Fe

• Ir