Exploring the World of Chemistry

Why is chemistry often called the central science?

• Chemistry is unrelated to physics and biology.

• Chemistry is called the central science because it connects and overlaps with other natural sciences.

• Chemistry is the study of living organisms.

• Chemistry is only concerned with chemical reactions.

Which of the following is a fundamental SI unit for measuring mass?

• gram

• kilogram

• pound

• ounce

What is the atomic number of an element?

• The atomic number is the total number of electrons in an atom.

• The atomic number of an element is the number of protons in its nucleus.

• The atomic number represents the mass of an element in atomic mass units.

• The atomic number is the number of neutrons in the nucleus of an atom.

Which particle has a positive charge?

• Proton

• Electron

• Neutron

• Alpha particle

What is the primary purpose of chemical measurements?

• To measure the temperature of substances.

• To analyze the smell of substances.

• To determine the color of substances.

• To quantify properties and concentrations of substances.

What is the SI unit for measuring temperature?

• Kelvin

• Rankine

• Fahrenheit

• Celsius

Which model of the atom proposed that electrons orbit the nucleus in fixed paths?

• Rutherford model

• Bohr model

• Quantum mechanical model

• Thomson model

What is the charge of a neutron?

• -1

• +2

• 0

• +1

What is the significance of the mole in chemistry?

• The mole is significant because it defines the weight of a substance in grams.

• The mole is significant because it provides a consistent way to quantify and relate the number of particles in chemical substances.

• The mole is a unit for measuring the volume of gases only.

• The mole is used to measure temperature in chemical reactions.

Which of the following is a subatomic particle found in the nucleus?

• Electron

• Proton

• Quark

• Neutron Star