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Elis [28]
3 years ago
11

An atom of gold (Au) has 79 electrons. How many protons must it have if it has a net charge of 0?

Chemistry
2 answers:
Varvara68 [4.7K]3 years ago
6 0
In order to balance out the Electrons, and give it a net charge of 0, you would need 79 Protons.
RoseWind [281]3 years ago
5 0

Explanation:

It is known that for a neutral atom the number of protons present in that atom is equal to the number of electrons present in it.

Also, atomic number means the sum of total number of protons present in an atom.

For example, when a gold atom has net charge 0 then it means it is neutral in nature.

Also, it contains 79 electrons. This also means it contains 79 protons.

Thus, we can conclude that an atom of gold (Au) which has 79 electrons will also contain 79 protons.

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Sylvanite is a mineral that contains 28.0% gold by mass. How much sylvanite would you need to dig up to obtain 73.0 g of gold?
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3 0
3 years ago
A biology student set up an experiment to study 9 mice. On day 1, they were measured for weight and length. Then the mice were p
Sophie [7]
The independent variable would be the variable in the research that is being manipulated by the researcher. In this case, it would be temperature in the cage as it is what is being manipulated and changed in the research design. The dependent variable would be the variable that is being studied so, for this case, it would be the length and the weight of the mice. The constants are the factors that might affect the dependent variable but is held constant or the same by the researcher throughout the experiment. These are the size of the cage, amount of food and the exercise wheel. The flaw that the scientist would be studying the length of the mice since I don't think the temperature has any effect on it. And base from he results, the change in lengths are not conclusive.
4 0
3 years ago
Water freezing is an exothermic process? tue or false
Aliun [14]

Answer:

Explanation:

When water becomes a solid, it releases heat, warming up its surroundings. This makes freezing an exothermic reaction.

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8 0
2 years ago
Explain what is in a buffer. Discuss the function of a buffer. How will pH change when small amounts of acids or bases are added
AnnyKZ [126]

Answer:

Is a substance that can maintain  certain range of pH

Explanation:

A buffer is mixture of two salts that are complementary, one salt is acid and another is basic, but since then share some part of their structure, if you add to this mixture another acid, the basic salt can absorb it and still maintaining the same pH. If you pour a base, the acid salt will absorb it and again the final pH will remain the same. So the buffers are used to maintain the same pH does not matter if you add small quantities of an acid or base.

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