Introduction to Chemistry: Dive into the Fundamentals of the Science

Question 1

What is the systematic approach used in scientific inquiry?

Accepted Answer

Scientific method

Answer

Hypothesis-driven approach

Answer

Experimental design

Answer

Data analysis

Question 2

Which of the following is a chemical change?

Accepted Answer

Burning wood

Answer

Melting ice

Answer

Freezing water

Answer

Dissolving sugar in water

Question 3

What is the fundamental unit of matter?

Accepted Answer

Atom

Answer

Molecule

Answer

Ion

Answer

Compound

Question 4

Which characteristic defines a scientific hypothesis?

Accepted Answer

Provides a tentative explanation

Answer

Must be proven

Answer

Based on personal beliefs

Answer

Does not require testing

Question 5

Which of these is a SI base unit?

Accepted Answer

Kilogram

Answer

Mole

Answer

Calorie

Answer

Pound

Question 6

Describe the distinction between qualitative and quantitative observations.

Accepted Answer

Qualitative: descriptive, Quantitative: numerical

Answer

Quantitative: descriptive, Qualitative: numerical

Answer

Both describe and measure

Answer

Neither describes nor measures

Question 7

What is the SI unit of temperature?

Accepted Answer

Kelvin

Answer

Celsius

Answer

Fahrenheit

Answer

Rankine

Question 8

Which of the following is not a recognized branch of chemistry?

Accepted Answer

Cosmetology

Answer

Organic chemistry

Answer

Analytical chemistry

Answer

Physical chemistry

Question 9

Chemistry is best defined as the study of:

Accepted Answer

The nature and properties of matter

Answer

Living organisms

Answer

The laws of physics

Answer

Mathematical concepts

Question 10

The systematic approach used in scientific investigations is known as the:

Accepted Answer

Scientific method

Answer

Scientific hypothesis

Answer

Scientific theory

Answer

Scientific experiment

Question 11

The chemical symbol for the element carbon is:

Accepted Answer

C

Answer

Ca

Answer

Cl

Answer

Cr

Question 12

The smallest unit of matter that exhibits the chemical properties of an element is called a/an:

Accepted Answer

Atom

Answer

Molecule

Answer

Ion

Answer

Compound

Question 13

When atoms share electrons, the type of chemical bond formed is a/an:

Accepted Answer

Covalent bond

Answer

Ionic bond

Answer

Metallic bond

Answer

Hydrogen bond

Question 14

The molar mass of water (H2O) is:

Accepted Answer

18 g/mol

Answer

16 g/mol

Answer

32 g/mol

Answer

64 g/mol

Question 15

Which of the following is not a branch of chemistry?

Accepted Answer

Economics

Answer

Analytical Chemistry

Answer

Biochemistry

Answer

Astrochemistry

Question 16

Which of the following is NOT a characteristic of science?

Accepted Answer

Subjective and influenced by personal biases

Answer

Objective and evidence-based

Answer

Based on logical reasoning and reproducible experiments

Answer

Emphasizes testability and prediction

Question 17

The scientific method comprises a series of steps. Which of the following is NOT one of those steps?

Accepted Answer

Accepting or rejecting the hypothesis based solely on initial beliefs

Answer

Making observations and formulating questions

Answer

Developing a hypothesis based on evidence

Answer

Testing the hypothesis through experimentation

Question 18

Which of the following is an example of a chemical change?

Accepted Answer

Burning of wood

Answer

Melting of ice

Answer

Dissolving salt in water

Answer

Folding a piece of paper

Question 19

The atomic number of an element indicates the:

Accepted Answer

Number of protons in the nucleus

Answer

Number of neutrons in the nucleus

Answer

Number of electrons in the outermost energy level

Answer

Total number of protons, neutrons, and electrons

Question 20

Which of the following is classified as a metalloid?

Accepted Answer

Silicon

Answer

Sodium

Answer

Phosphorus

Answer

Chlorine

Question 21

The chemical formula for sodium chloride is:

Accepted Answer

NaCl

Answer

Na2Cl

Answer

NaCl2

Answer

Na2Cl2

Question 22

Which of the following gases contributes to the greenhouse effect?

Accepted Answer

Carbon dioxide

Answer

Nitrogen

Answer

Oxygen

Answer

Helium

Question 23

The process by which plants convert carbon dioxide and water into glucose and oxygen is called:

Accepted Answer

Photosynthesis

Answer

Respiration

Answer

Combustion

Answer

Fermentation

Question 24

Which of the following is a chemical considered hazardous?

Accepted Answer

Hydrochloric acid

Answer

Sugar

Answer

Water

Answer

Sodium bicarbonate

Question 25

The study of the composition, structure, properties, and reactions of matter is known as:

Accepted Answer

Chemistry

Answer

Physics

Answer

Biology

Answer

Geology

Question 26

In the scientific method, what is the correct sequence of steps?

Accepted Answer

Observation, Hypothesis, Experiment, Conclusion

Answer

Hypothesis, Experiment, Observation, Conclusion

Answer

Experiment, Hypothesis, Observation, Conclusion

Question 27

Which of the following concepts is NOT fundamental to chemistry?

Accepted Answer

Biological processes

Answer

Structure and properties of matter

Answer

Energy transformations

Answer

Intermolecular forces

Question 28

The SI unit of amount of substance is the:

Accepted Answer

Mole

Answer

Gram

Answer

Liter

Answer

Kelvin

Question 29

Approximately what percentage of Earth's atmosphere is nitrogen?

Accepted Answer

78%

Answer

21%

Answer

50%

Answer

99%

Question 30

Which of the following is considered a renewable energy source?

Accepted Answer

Hydroelectricity

Answer

Fossil fuels

Answer

Nuclear energy

Answer

Oil

Question 31

What is the primary function of enzymes in chemical reactions?

Accepted Answer

Lower the activation energy

Answer

Increase the activation energy

Answer

Alter the reaction products

Answer

Slow down the reaction rate

Question 32

Calculate the molar mass of carbon dioxide (CO2).

Accepted Answer

44 g/mol

Answer

28 g/mol

Answer

32 g/mol

Answer

48 g/mol

Question 33

What is the core focus of chemistry?

Accepted Answer

Investigating matter, energy, and how they interact.

Answer

Exploring only theoretical ideas with no real-world applications.

Answer

Reliance solely on mathematical calculations for predictions.

Answer

Complete separation from other sciences like physics and biology.

Question 34

The periodic table is organized primarily by which property?

Accepted Answer

Atomic number

Answer

Atomic mass

Answer

Chemical properties

Answer

Physical properties

Question 35

Which of the following is an example of a chemical change?

Accepted Answer

Burning wood

Answer

Melting ice

Answer

Dissolving salt in water

Answer

Crushing a can

Question 36

The molar mass of a substance is defined as:

Accepted Answer

Mass of one mole of the substance

Answer

Mass of one molecule of the substance

Answer

Mass of one gram of the substance

Answer

Mass of one litre of the substance

Question 37

Which of the following is considered a strong acid?

Accepted Answer

Hydrochloric acid

Answer

Acetic acid

Answer

Carbonic acid

Answer

Phosphoric acid

Question 38

The pH of a neutral solution is:

Accepted Answer

7

Answer

0

Answer

14

Answer

2

Question 39

Which of the following is a greenhouse gas that contributes to climate change?

Accepted Answer

Carbon dioxide

Answer

Oxygen

Answer

Nitrogen

Answer

Water vapour

Question 40

The study of the structure, properties, and reactions of compounds containing carbon is known as:

Accepted Answer

Organic chemistry

Answer

Inorganic chemistry

Answer

Physical chemistry

Answer

Analytical chemistry

Question 41

Which of the following is not a core branch of chemistry?

Accepted Answer

Mathematics

Answer

Analytical Chemistry

Answer

Organic Chemistry

Answer

Biochemistry

Question 42

Which step is NOT part of the scientific method?

Accepted Answer

Writing a Creative Essay

Answer

Forming a Hypothesis

Answer

Collecting Data

Answer

Analyzing Results

Question 43

Which of the following best describes the central focus of chemistry?

Accepted Answer

The study of the composition, structure, properties, and interactions of matter

Answer

The study of interactions between organisms within ecosystems

Answer

The study of weather patterns and atmospheric conditions

Question 44

Which of the following is not a recognized step in the scientific method?

Accepted Answer

Formulating a conclusion before making observations

Answer

Making observations

Answer

Conducting an experiment

Answer

Formulating a hypothesis

Question 45

In what way does chemistry play a pivotal role in contemporary life?

Accepted Answer

In the development of pharmaceuticals and vaccines

Answer

In solving complex physics equations

Answer

In understanding historical events

Answer

In predicting long-term weather changes

Question 46

What is the standard international unit for expressing the amount of a substance?

Accepted Answer

Mole

Answer

Kelvin

Answer

Liter

Answer

Gram

Question 47

Which of the following is an example of a noble gas element?

Accepted Answer

Helium

Answer

Carbon

Answer

Sodium

Answer

Chlorine

Question 48

What type of chemical reaction is characterized by the combination of two or more substances to form a new, single compound?

Accepted Answer

Synthesis reaction

Answer

Decomposition reaction

Answer

Double displacement reaction

Answer

Single displacement reaction

Question 49

What is the chemical symbol for potassium?

Accepted Answer

K

Answer

Fe

Answer

Ca

Answer

Na

Question 50

Which of the following is a characterizing property of strong acids?

Accepted Answer

Complete dissociation in water

Answer

Produce hydroxide ions (OH-) in water

Answer

Do not dissociate in water

Answer

Partially dissociates in water