Physical Science 6.2 Questions

How do plants absorb water?

• Through their leaves

• Through their roots

• Through their stems

• Through their flowers

What do plants convert water and carbon dioxide into?

• Oxygen

• Sugar

• Protein

• Fat

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What is the source of energy for plants to convert water and carbon dioxide into sugar?

• Soil nutrients

• Sunlight

• Water

• Carbon dioxide

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Through what do plants take in carbon dioxide?

• Roots

• Stems

• Small openings in their leaves

• Flowers

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How are atoms held together in a covalent bond?

• By sharing a pair of valence electrons

• By transferring electrons

• By sharing protons

• By exchanging neutrons

What is a covalent bond?

• A bond where atoms share a pair of valence electrons

• A bond where atoms transfer electrons

• A bond where atoms share protons

• A bond where atoms exchange neutrons

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What happens when a hydrogen atom has two electrons?

• It becomes a helium atom.

• It forms a covalent bond.

• It becomes unstable.

• It becomes a noble gas.

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How can two hydrogen atoms achieve a stable electron configuration?

• By losing electrons.

• By sharing electrons.

• By gaining protons.

• By splitting electrons.

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What is a bond called when two atoms share one pair of electrons?

• Double bond

• Triple bond

• Single bond

• Ionic bond

Which model shows a covalent bond by a pair of dots in the space between the symbols for the hydrogen atoms?

• Electron dot model

• Structural formula

• Electron cloud model

• Space-filling model

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