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Science Grade 7 Exercise
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  • Each line maps to a question.
  • If the delimiter is used in a question, the question should be surrounded by double quotes: "My, question","My, answer"
  • The first answer in the multiple choice question must be the correct answer.

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Turns litmus blue into blue, Turns litmus red into blue. the substance is .... (acid/base/neutral?)
base
Turns litmus blue into red, Turns litmus red into red. the substance is .... (acid/base/neutral?)
Acid
Special type of substances are used to test whether a substance is acidic or basic.
Indicators
Acid + base --> ...... + .......
salt + water
bleach have pH = 13. bleach is considered .... (Strong acid/weak acid/strong base/weak base?)
Strong Base
vinegar have pH = 4. vinegar is considered .... (Strong acid/weak acid/strong base/weak base?)
weak acid
HCl have pH = 2. HCl is called .... (Strong acid/weak acid/strong base/weak base?)
Strong acid
mineral water is a substance with pH = 7 or it is called .....
neutral
State 3 properties of base. taste? pH? example?
Taste bitter. pH more than 7. example : bleach, soap, ammonia
State 3 properties of acid. taste? pH? example?
taste sour. pH less than 7. example : Orange, lemon, pineapple
Mercury is liquid. Mercury is an example of ...
Metal
Baking soda (NaHCO₃) is an example of .... (element/compound/mixture?)
Compound
Give 3 example of heterogeneous mixture
milk, river water, fog, smog, etc
Give 3 example of homogeneous mixture
salt water, sugar water, syrup, etc
Dull, brittle and insulator are the properties of ......
Nonmetals
Semiconductor, brittle and have metallic cluster are the properties of .....
Metalloid
Mostly solid, ductile and malleabe are the properties of ......
Metal
Periodic table shows all known .....(element/compound/mixtures?)
Element
Changing state of matter from liquid to solid is called?
freezing
Changing state of matter from gas to liquid is called?
condensation
Changing state of matter from liquid to gas is called?
Vaporization
Changing state of matter from solid to liquid is called?
Melting
Bleach is an example of (Acid/Base/Neutral?)
Base
Mixture divided into 2 categories, they are .... and ....
homogeneous and heterogeneous mixture
Matter is divided into 4 states, they are ....
Solid, liquid, gas and plasma


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