2024 CORE Sci Revision

What is the correct order of steps to draw an electron shell diagram?

• Identify the number of protons, draw the nucleus, add electron shells, place electrons.

• Draw the nucleus, identify the number of protons, add electron shells, place electrons.

• Place electrons, draw the nucleus, add electron shells, identify the number of protons.

• Add electron shells, draw the nucleus, place electrons, identify the number of protons.

Which of the following is a balanced chemical equation?

What components are found in an atom?

• Nucleus, protons, neutrons, electron shells

• Nucleus, electrons, ions, molecules

• Protons, neutrons, ions, molecules

• Electrons, ions, molecules, compounds

What does the atomic number of an element represent?

• The number of neutrons in the nucleus

• The number of protons in the nucleus

• The total number of protons and neutrons

• The number of electron shells

How do protons, neutrons, and electrons differ?

• Protons are negatively charged, neutrons are neutral, electrons are positively charged.

• Protons are positively charged, neutrons are neutral, electrons are negatively charged.

• Protons are neutral, neutrons are negatively charged, electrons are positively charged.

• Protons are neutral, neutrons are positively charged, electrons are negatively charged.

What is the difference between cations and anions?

• Cations are negatively charged, anions are positively charged.

• Cations are positively charged, anions are negatively charged.

• Cations are neutral, anions are charged.

• Cations are charged, anions are neutral.

Which of the following is an example of an acid?

• Sodium hydroxide

• Hydrochloric acid

• Ammonia

• Calcium carbonate

What pH value represents a neutral solution?

• 0

• 7

• 14

• 10

Which of the following best describes the greenhouse effect?

• The trapping of heat by greenhouse gases in the Earth's atmosphere.

• The cooling of the Earth's surface due to the reflection of sunlight.

• The increase in plant growth due to higher carbon dioxide levels.

• The reduction of ozone in the Earth's atmosphere.

Which of the following is not a main type of greenhouse gas?

• Carbon dioxide

• Methane

• Oxygen

• Nitrous oxide