2nd Quarterly Assessment in Science 7

Which statement is true regarding pure substances?

• Pure substances may be homogeneous or heterogeneous

• Pure substances have definite boiling and melting points

• Pure substances are a physical combination of two or more elements.

• Pure substances can be further broken down into simpler substances.

It is a class of matter which has a one (1) phase system.

• Pure substance

• Matter

• Mixture

• Homogenous

_______ when the mixed substances are uniform in composition and every part of the solution has the same properties.

• Homogeneous

• Heterogeneous

• Matter

• Mixture

What are the two types of pure substances?

• compound and mixtures

• elements and mixtures

• elements and compounds

• homogeneous and heterogeneous mixtures

Which of the following is an element?

• Sugar

• Copper

• salt

• water

Water is not in the periodic table because:

• It is a liquid substance

• It is a natural substance

• It is a compound not an element

• It is a mixture

The person who first arranged elements in the form of a periodic table was?

• Lewis

• Mendeleev

• Thomas

• Darwin

Based on the table, which of the following samples is basic?

• Banana

• Tomato

• Hydrochloric acid

• Ammonia

What sample is the 'strongest acid'?

• Banana

• Ammonia

• Seawater

• Hydrochloric acid

What is the 'strongest base'?

• Ammonia

• Tomato

• Banana

• Seawater