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Questions Bank (1496148 total)

Which of the following is NOT evidence that a chemical reaction has occurred?

A, B and C are correct

No correct answer

Formation of precipitate when chemicals are contacted with each other.

Color change when chemicals are contacted with each other.

Evolution of gas formation when chemicals are contacted with each other

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What is the proper name for HBr(aq)?

None of the above

Hydrousbromic acid

Hydrobromous acid

Hydrobromic acid

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Suppose that in an ionic compound, "X" represents a metal that could form more than one type of ion. In the formula XY₂, the charge of the M ion would be:

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Which of the following statements about balancing chemical equations is FALSE?

When coefficients are added the type of compounds is changed in the chemical reaction.

Subscripts are multiplied by the coefficients to determine the number of atoms in a compound.

Coefficients are added to compounds to ensure both sides of the reaction have equal numbers of each atom.

All of the above statements are true.

If there is no coefficient or subscript, a zero is implied.

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A student wrote the formula for the compound sodium bisulfate as NaHSO₄. What is wrong with this formula?

There cannot be four different atom types in a chemical formula.

The formula should be Na(HSO₄)

Sodium is a metal so it cannot form an ionic compound.

Nothing is wrong with the formula.

The compound is not neutrally charged.

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Which of the following elements does NOT exist as a diatomic molecule in nature?

None of the choices

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Which formula shows the proper use of parentheses?

None of the above

(NH₄)₃(PO₄)

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Which of the following is NOT a technique for separating mixtures into their components?

None of the above

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A fictional element has two naturally occurring isotopes with the natural abundances shown here:

Which statement is TRUE for this element?

The atomic mass would be 108.

The atomic mass would be 107.

The atomic mass would be more than 109.

The atomic mass would be 109.

The atomic mass would be less than 107.

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In which of the following classes of organic compounds is an oxygen atom bonded to a hydrogen atom?

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