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Q:

Tooth decay starts when the pH of the mouth is lower than

A) 5.7 B) 5.5
C) 5.6 D) 5.4
 
Answer & Explanation Answer: B) 5.5

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Q:

When ice cubes are made, the entropy of water

A) does not change B) decreases
C) increases D) may either increase or decrease depending on the process used
 
Answer & Explanation Answer: B) decreases

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Q:

Which one of the following forms of phosphorus is most reactive?

A) Black phosphorus B) White phosphorus
C) Violet phosphorus D) Red phosphorus
 
Answer & Explanation Answer: B) White phosphorus

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Q:

Isotones have always ______

A) Same number of protons B) Same atomic number
C) Same number of neutron D) Same number of proton and same numbe of neutron
 
Answer & Explanation Answer: C) Same number of neutron

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Q:

Barium loses ____ electrons to achieve noble gas electron configuration.

A) 1 B) 2
C) 3 D) 4
 
Answer & Explanation Answer: B) 2

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Q:

Which process usually requires water?

A) Physical weathering B) Mass wasting
C) Chemical weathering D) Erosion
 
Answer & Explanation Answer: C) Chemical weathering

Explanation:

Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts. These reactions occur particularly when the water is slightly acidic.

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Q:

Besides CO2, the other green house gas is

A) CH4 B) N2
C) Ar D) O2
 
Answer & Explanation Answer: A) CH4

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Q:

The common name of hydrogen peroxide is

A) borax B) bleach (liquid)
C) baking soda D) gypsum
 
Answer & Explanation Answer: B) bleach (liquid)

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