S1: Elements, Compounds & Mixtures

An atom is __________.

(You may choose one or more answers)

• the smallest particle that is indivisible

• visible under the microscope

• the smallest, indivisible living unit

• existing in solid, liquid or gaseous state

A molecule _____________.

• is a chemical combination of atoms

• is a mixture of atoms

• cannot be divided into smaller units

A molecule is made up of ______________.

• at least 2 compounds

• at least 2 atoms

• at least 2 elements

• a pure substance

Elements in the same period share the same chemical properties.

True or false?

• True

• False

Elements in the periodic table are arranged _____________.

(You may choose one or more answers)

• in columns and rows

• in groups and periods

• from metals to non-metals

• from non-metals to metals

Which of the following are examples of chemical properties?

(You may choose one or more answer)

• Flammability

• Density

• Boiling point

• Toxicity

• pH value

 

Non-metals ________________.

(You may choose one or more answers)

• are malleable

• are silvery in appearance

• have low melting and boiling points

• are poor conductors of heat and electricity

A compound is made up of ______________.

• 2 or more different elements

• 2 or more different molecules

• the same type of elements that are chemically combined

• the same type of molecules that are chemically combined

Which of the following is a compound?

(You may choose one or more answers)

• Air

• Water

• Table salt

• Oxygen

Substance X is green.

Substance Y is yellow.

A combination of both substances make a red Substance W.

 

Which of the following properties apply to Substance W?

(You may choose one or more answers)

• Its melting and boiling point ranges.

• Its components are present in a fixed ratio.

• It can be separated using physical methods.

• It has a different physical property from its constituent elements.