Chemistry Unit 10

What is an isotope in nuclear chemistry?

• A variant of a chemical element with the same number of protons but a different number of neutrons.

• A variant of a chemical element with the same number of neutrons but a different number of protons.

• A type of chemical bond between atoms.

• A molecule containing two or more different elements.

Answer explanation

An isotope in nuclear chemistry is a variant of a chemical element with the same number of protons but a different number of neutrons, making it the correct choice.

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DOK Level 1: Recall

Which of the following is a product of cellular respiration?

• Oxygen

• Glucose

• Carbon dioxide

• Sunlight

Answer explanation

Carbon dioxide is a product of cellular respiration as it is released during the process in which glucose is broken down to produce energy.

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DOK Level 1: Recall

What type of nuclear reaction occurs in the sun?

• Fission

• Fusion

• Decay

• Ionization

Answer explanation

The type of nuclear reaction that occurs in the sun is Fusion, where hydrogen atoms combine to form helium, releasing energy in the process.

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DOK Level 1: Recall

What is the primary purpose of photosynthesis in plants?

• To produce oxygen

• To consume carbon dioxide

• To produce glucose

• Both A and C

Answer explanation

The primary purpose of photosynthesis in plants is to produce oxygen and glucose, making option 'Both A and C' the correct choice.

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DOK Level 1: Recall

Which molecule is known as the "energy currency" of the cell, commonly produced during cellular respiration?

• DNA

• RNA

• ATP

• Lipid

Answer explanation

ATP is known as the 'energy currency' of the cell and is commonly produced during cellular respiration.

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DOK Level 1: Recall

What is the basic equation for photosynthesis?

Answer explanation

The basic equation for photosynthesis is 6CO2 + 6H2O -> C6H12O6 + 6O2

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DOK Level 1: Recall

Which particle is emitted in alpha decay in nuclear chemistry?

• Electron

• Proton

• Neutron

• Alpha particle

Answer explanation

In alpha decay, an alpha particle is emitted, which consists of two protons and two neutrons. It is not an electron, proton, or neutron.

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DOK Level 1: Recall

What is the first step of cellular respiration, where glucose is broken down?

• Electron Transport Chain

• Krebs Cycle

• Glycolysis

• Fermentation

Answer explanation

The first step of cellular respiration, where glucose is broken down, is Glycolysis.

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DOK Level 1: Recall

In nuclear chemistry, what does the term "half-life" refer to?

• The time it takes for a substance to fully decay.

• The time it takes for half of the radioactive atoms in a sample to decay.

• The time it takes for a substance to double its radioactivity.

• The time it takes for a substance to lose all its energy.

Answer explanation

The term 'half-life' in nuclear chemistry refers to the time it takes for half of the radioactive atoms in a sample to decay.

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DOK Level 1: Recall

Which gas is utilized by plants during the process of photosynthesis?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

Answer explanation

Plants utilize carbon dioxide during photosynthesis to produce glucose and oxygen as a byproduct.

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DOK Level 1: Recall