Unit 1 lesson 3

Methane is from ………… molecules, while nitric acid is …………………. molecule

• Pure_mixture

• Organic_non organic

• Non organic_organic

Red mercury oxide can be decomposed into _______ and ______ by

heating

• Oxagen . Mercury

• Hydrogen . Mercury

……………………. Is considered from homogeneous mixtures.

• A mixture of iron filings and sawdust

• Salt solution

• mixture of sand and water

• mixture of oil with water -

…………. can be decomposed through electrolysis by using

Hoffman’s voltammeter

• mercuric oxide

• water

• carbon

• nitric acid

________ pure substance formed by the chemical combination of two or

more elements in a fixed mass ratio

• Pure element

• Compound

• Mixture

molecule of sulphuric acid H₂SO₄ contains ……….. atoms, while the number of

elements in an acetylene molecule C₂H₂ is... …… .

• 8. 2

• 7. 2

• 4. 4

…………..is included in the composition of aerogel by 99.8%

• Water

• Air

• Airogel

Lemon is a substance that turns the litmus paper………….. while toothpaste is

a substance that turns the litmus paper.................

• Blue. Red

• No chang

• Red. Blue

………….is used to make jackets for researchers in Antarctica, while…………

is used to make cooking utensils

• Glass . iron

• Airogel. Stainless steel alloy

• Lenther. Stainless steel alloy

Silicon is a metalloid that conducts electricity poorer than………….… but better

than……….……..

• Metals. Nonmetals

• Non metals. Metals