Which of the following best describes the term 'mole' in Chemistry?

• A unit used to count particles such as atoms or molecules

• A type of chemical reaction

• A small burrowing mammal

Refer to the periodic table images of Carbon (C) and Oxygen (O). What is the molar mass of Carbon Dioxide (CO₂)?

• 12g/mol

• 16g/mol

• 28g/mol

• 44g/mol

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What is the atomic number of Cobalt?

• 27

• 58.933

• 2

• 15

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Tags

NGSS.HS-PS1-1

1 mole of molecules = 6.022 x 10^23 molecules

• true

• false

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What are the reactants? What are the products?

• CHLORINE GAS

• VINEGAR

• WATER

• ACETATE

• ACETATE

• WATER

• VINEGAR

• CHLORINE GAS

• BLEACH

• BLEACH

The reaction represented by the equation 2H₂O₂ → 2H₂O + O₂ is a

• synthesis or composition reaction.

• decomposition reaction.

• single-replacement reaction.

• double-replacement reaction.

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In the chemical equation 3CO₂ + 4H₂ → C₃H₈ + 5O₂, identify the circled numbers.

• coefficient

• subscript

• superscript

• subscript

• coefficient

The reaction H₂ + Cl₂ → 2HCl is an example of a

• synthesis reaction.

• decomposition reaction.

• single-replacement reaction.

• double-replacement reaction.

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What are the typical products formed when methane undergoes complete combustion in excess oxygen?

• carbon monoxide and hydrogen.

• carbon dioxide and water.

• methanol and water.

• carbon and water.

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Choose the correct conversion factor to convert 24.0 grams of Fe to moles of Fe.

• 1 mol Fe / 55.845 g Fe

• 55.845 g Fe / 1 mol Fe