CHEMISTRY HIGH SCHOOL

An atom of the element zinc has an atomic number of 30 and a mass number of 65. How many protons does an uncharged zinc atom have?30
35
65
95

Answers

Answer 1

Answer:

Answer : The correct option is, 30 protons

Explanation :

Element = Zinc

Atomic number = 30

Atomic mass number = 65

As we know that the atomic number is equal to the number of electrons and number of protons.

Atomic number = Number of electrons = Number of protons = 30

Number of neutrons = Atomic mass - Number of protons = 65 - 30 = 35

Therefore, the number of protons an uncharged zinc atom have 30 protons.

Answer 2

Answer:

Answer:

30 protons

Explanation:

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What is ph? And explain where it can be used

Answers

PH is a measure of hydrogen(colorless, odorless) concentration of solutions. Ph is in solutions for an example like spray to clean the kitchen counter or table.These things have color and are odorless after a while.

As this reaction takes place at higher temperatures, it is observed that the equilibrium shifts toward the products. The reaction is

Answers

As this reaction takes place at higher temperatures, it is observed that the equilibrium shifts toward the products. The reaction is an endothermic reaction since it requires energy for the reaction to proceed which describes an endothermic reaction.

The answer is: endothermic reaction.

This reaction is endothermic (enthalpy is higher than zero), which means that heat is added.

According to Le Chatelier's principle when the reaction is endothermic heat is included as a reactant and when the temperature increased, the heat of the system increase, so the system consume some of that heat by shifting the equilibrium to the right, producing more products.

What change occur when a substance changes form,shape or phase but it's identity remains the same

Answers

This change is known as a physical change where the substance changes its form, shape or phase but the identity remains the same. The change only affects the form of a substance but not the composition. Examples are melting ice, boiling water, and tearing a paper.

Which phase change absorbs energy? A. H2O (g) --> H2O (s) B. H2O (g) --> H2O (l) C. H2O (l) --> H2O (g) D. H2O (l) --> H2O (s)

Answers

Answer:

C. H2O (l) --> H2O (g)

Explanation:

Hello,

In this case, we need to remember that processes absorbing energy are those that have positive heat, it means, process that obtain energy from a certain source. In such a way, processes that need energy, in terms of phase chance are fusion, sublimation and evaporation, which are the change from solid to liquid, solid to gas and liquid to gas respectively. Therefore, for the given options, we can see that C. H2O (l) --> H2O (g) accounts for an evaporation process which actually absorbs energy.

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An anvil-shaped heard is a feature of a mature thunderstorm : true false

Answers

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When heated, mercury oxide produces oxygen plus mercury. What would be the combined mass of oxygen and mercury if 20g of mercury oxide were heated?

Answers

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Final answer:

The combined mass of oxygen and mercury obtained from the thermal decomposition of 20g of mercury(II) oxide would also be 20g. The exact division between oxygen and mercury would depend on the stoichiometry of the reaction.

Explanation:

The subject here is the thermal decomposition of mercury(II) oxide (HgO). When this compound is heated, it decomposes into mercury and oxygen. The mass principle in chemistry, also known as the Conservation of Mass, states that the combined mass of the products (oxygen and mercury in this case) should be equal to the mass of the reactant (mercury oxide). Therefore, if you heat 20g of mercury(II) oxide, you would obtain a combined mass of 20g of oxygen and mercury. The exact mass of oxygen and mercury would depend on the atomic mass and stoichiometry of the decomposition reaction. For example, if the reaction were 2HgO --> 2Hg + O2, you would get twice as much mercury mass as oxygen, due to the nature of the balanced equation.