Elements and compounds revision

What is an atom?

• A type of compound

• The tiny particles which make up everything

• A mixture of two elements

• A process of coating metal

Imagine you're studying a periodic table for a chemistry exam. You notice each element has a unique number. What does this number represent?

• The number of electrons in an atom of the element

• The number of compounds that can be formed with the element

• The number of protons in an atom of the element

• The number of mixtures that can contain the element

Which term describes a substance that electricians often use because it can be drawn out and stretched into wires for electrical wiring?

• Malleable

• Lustrous

• Ductile

• Electroplating

What is a compound?

• A substance that shines when polished

• A substance mixed but not chemically joined

• A substance in which two or more elements are joined together chemically

• A substance that can be bent into shapes

What is electrolysis?

• Coating a metal with another metal

• A substance which is mixed but the elements are not chemically joined

• Breaking down a compound into its elements by passing electricity through it

• The number of protons in an atom

Imagine you have a saltwater solution and a salad. What is the main difference between these two in terms of their composition?

• The saltwater solution is a compound because it can only be separated into water and salt through evaporation, a chemical process, while the salad is a mixture because its ingredients can be physically separated.

• The saltwater solution is a mixture of two metals, while the salad is a combination of non-metallic elements.

• The saltwater solution and the salad are the same; there is no difference in terms of composition.

• The salad is a chemically bonded entity, while the saltwater solution is not.

When a jeweler decides to create a new piece of jewelry, what property of gold allows them to hammer it into thin sheets for the design?

• Ductility

• Malleability

• Conductivity

• Luster

What does the periodic table organize?

• Only metals in order of reactivity

• Elements according to their atomic mass

• Elements according to their properties and atomic number

• Compounds based on their chemical formulas

Which group is the alkali metals?

Which group is the halogens?