Which statement concerning elements is true?(1) Different elements must have different numbers of isotopes.

1 answer:

4 0

The correct statement is (4) All atoms of a given element must have the same atomic number.

Atoms come in different isotopes(which have different mass), which differ in the number of neutrons, but are still the same element (this tells you why the other options are bad).

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Several properties of water are shown. Classify each property as a physical property or a chemical property.

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Chemical property:

Can be split into hydrogen and oxygen
Reacts with certain metals

Physical property:

Is liquid at room temperature
Has a density of 1.0 g/cm³

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Chemosynthesis and photosynthesis are both processes that produce food. True or false?

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Complete the table below by deciding whether a precipitate forms when aqueous solutions A and B are mixed. If a precipitate will

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The reaction between copper II chloride and sodium sulfide as well as lead II nitrate and potassium sulfate both produce precipitates.

The solubility of a substance in water is in accordance with the solubility rules. It is possible that a solid product may be formed when two aqueous solutions are mixed together. That solid product is referred to as a precipitate.

Now, we will consider each reaction individually to decode whether or not a precipitate is possible.

In the first reaction, we have; CuCl2(aq) + Na2S(aq) ---->CuS(s) + 2NaCl(aq). A precipitate (CuS) is formed.
In the second reaction, Pb(NO3)2(aq) + 2KNO3(aq) ----> PbSO4(s) + KNO3(aq), a precipitate PbSO4 is formed
In the third reaction, NH4Br(aq) + NaOH(aq) ----->NH3(g) + NaBr(aq) + H2O(l), a precipitate is not formed here.

Learn more: brainly.com/question/11969651

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