Computa Quiz - ComputaNetworks

Question 1 / 20

Air is a combination of various gases like nitrogen, oxygen, and carbon dioxide. Air is classified as a:

A. Compound B. Mixture C. Element D. Atom

Question 2 / 20

Which of the following can be separated easily into its components using simple physical methods like filtration or evaporation?

A. A compound B. An element C. A mixture D. An atom

Question 3 / 20

A mixture of sand and water is an example of a:

A. Pure substance B. Homogeneous mixture C. Heterogeneous mixture D. Compound

Question 4 / 20

Which of the following is considered a pure substance?

A. Tap water B. Iron nail C. Air D. Lemonade

Question 5 / 20

In which of the following substances do the individual components retain their original properties?

A. Water B. Carbon dioxide C. Salt solution D. Common salt

Question 6 / 20

Sea water contains dissolved salts and water. Sea water is a:

A. Element B. Compound C. Mixture D. Pure substance

Question 7 / 20

Which of the following is formed without any chemical reaction taking place?

A. Water B. Sugar solution C. Carbon dioxide D. Common salt

Question 8 / 20

A substance formed by physically mixing two or more substances in any proportion is called a:

A. Compound B. Element C. Mixture D. Molecule

Question 9 / 20

Which of these is a homogeneous mixture where the components are completely uniformly distributed?

A. Muddy water B. Chalk dust in water C. Sugar dissolved in water D. Oil and water mixture

Question 10 / 20

Which element is found in both water molecules and carbon dioxide molecules?

A. Hydrogen B. Carbon C. Oxygen D. Nitrogen

Question 11 / 20

Which gas present in air is an element necessary for living things during breathing?

A. Carbon dioxide B. Water vapor C. Oxygen D. Argon

Question 12 / 20

The chemical formula for Nitrogen gas as it exists in the atmosphere is:

A. N B. Ni C. N2 D. Nt

Question 13 / 20

What is the chemical symbol for Calcium?

A. C B. Cl C. Ca D. Cu

Question 14 / 20

Chalk is made of Calcium Carbonate (CaCO3). Chalk is classified as a:

A. Element B. Mixture C. Compound D. Metal

Question 15 / 20

When a solid dissolves completely into a liquid, the resulting mixture is called a:

A. Solution B. Suspension C. Compound D. Element

Question 16 / 20

Which of the following statements is TRUE about molecules?

A. They can only contain one type of atom B. They can be made of atoms of the same element or different elements C. They are always larger than cells D. They do not have any mass

Question 17 / 20

When iron filings and sulfur powder are just rubbed together without heating, they form a:

A. Compound B. New element C. Mixture D. Liquid

Question 18 / 20

What is the chemical symbol for Copper?

A. Co B. Cr C. Cu D. Cp

Question 19 / 20

Which of the following is NOT a pure substance?

A. Distilled water B. Oxygen gas C. Milk D. Gold

Question 20 / 20

Compounds have fixed boiling and melting points because they are:

A. Pure substances B. Heterogeneous mixtures C. Made of only one atom D. Gases

Quiz 3: Mixtures and Pure Substances

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