تدريب عام: Unit 1 : Chemical Substances (Science) - Preparatory 1 - Science

السؤال 1

What is the total charge of a molecule of any compound?

Varies depending on the compound

Positive

Negative

Zero

السؤال 2

Acids typically react with each other to form salts and water.

False

True

السؤال 3

Which statement accurately describes a neutral substance?

It turns red litmus blue and has a pH below 7.

It is corrosive and has a pH of 0.

It turns blue litmus red and has a pH above 7.

It does not change the color of litmus strips and has a pH of 7.

السؤال 4

Which statement accurately describes the electrical conductivity of most metals and nonmetals?

Electrical conductivity does not vary significantly between metals and nonmetals.

Metals are good electrical conductors, while most nonmetals are bad electrical conductors.

Both metals and nonmetals are generally good electrical conductors.

Nonmetals are better electrical conductors than metals.

السؤال 5

Which type of salt solution will have a pH value less than 7?

Sodium chloride solution.

Sodium carbonate solution.

Ammonium chloride solution.

Distilled water.

السؤال 6

Which of the following substances conducts electricity?

Pure sugar solution.

Distilled water.

A solution of sodium chloride in water.

Solid sodium chloride.

السؤال 7

How are the atoms of solid metals arranged?

As individual, isolated atoms.

In a random, amorphous structure.

In a metallic crystal lattice.

As distinct molecular units.

السؤال 8

What is a primary cause of acidic oxide evolution into the atmosphere?

Photosynthesis by plants

Volcanic eruptions

Burning of fossil fuels

Natural evaporation of water bodies

السؤال 9

In a metallic crystal lattice, what are the positive ions referred to as?

Atoms.

Anions.

Cations.

Molecules.

السؤال 10

Which molecular formula represents magnesium hydroxide?

Mg(OH)₃

Mg(OH)₂

MgOH

Mg₂OH

السؤال 11

Bronze alloy is known for its resistance to rusting.

False

True

السؤال 12

What is the primary characteristic that allows litmus to differentiate between acidic and alkaline substances?

It neutralizes the solution, causing a temperature change.

Its color differs in an acidic medium from that in an alkaline medium.

It becomes electrically conductive in different solutions.

It reacts with hydrogen ions to produce a gas.

السؤال 13

Metals typically have high melting points.

True

False

السؤال 14

For what medical purpose is Milk of Magnesia used?

To neutralize gastric acidity

To aid in food digestion directly

To provide energy to muscles

To cause muscle cramps

السؤال 15

What property allows metals to be hammered into thin sheets without breaking?

Malleability

Luster

Brittleness

Conductivity

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تدريب عام: Unit 1 : Chemical Substances (Science) - Preparatory 1

What is the total charge of a molecule of any compound?

Acids typically react with each other to form salts and water.

Which statement accurately describes a neutral substance?

Which statement accurately describes the electrical conductivity of most metals and nonmetals?

Which type of salt solution will have a pH value less than 7?

Which of the following substances conducts electricity?

How are the atoms of solid metals arranged?

What is a primary cause of acidic oxide evolution into the atmosphere?

In a metallic crystal lattice, what are the positive ions referred to as?

Which molecular formula represents magnesium hydroxide?

Bronze alloy is known for its resistance to rusting.

What is the primary characteristic that allows litmus to differentiate between acidic and alkaline substances?

Metals typically have high melting points.

For what medical purpose is Milk of Magnesia used?

What property allows metals to be hammered into thin sheets without breaking?