Why are some elements more reactive than others?

Answer: Option (c) is the correct answer.

Explanation:

A chemical equation will be balanced when there are equal number of both reactants and products.

For example, is an unbalanced chemical equation.

As there are two molecules of Cl on reactant side and there is only one molecule of Cl present on product side.

Therefore, to balance this chemical equation we will place the numbers in front of molecules as follows.

Thus, we can conclude that a chemical equation is balanced by changing or adding numbers in front of molecules.

A chemical equation is balanced by changing or adding numbers in front of molecules. The correct answer is option c.

A chemical equation is a symbolic representation of a chemical reaction in which the reactant molecules are on the left side and the product molecules are on the right side, with an arrow separating them to indicate the direction of the reaction.

• Numbers in front of molecules  are called coefficients, and they represent the number of molecules of each substance involved in the reaction. By changing the coefficients, you can balance the number of atoms on both sides of the equation.

Therefore, the correct answer is option c. numbers in front of molecules.

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1. Answer;

a. the strong nuclear force is much greater than the electric force.

Explanation;

• For an atom to be stable it means it has enough amount of binding energy to hold its nucleus together permanently.
• Therefore, an unstable atom lacks enough amount of binding energy to hold its nucleus permanently and thus undergoes decay to achieve stability. Unstable atoms are therefore referred to being radioactive.
• Small atoms are stable; this is because they have equal number of protons and neutrons and thus the protons and neutrons fill up energy levels while maximizing the strong force binding the nucleus together.

9. Answer;

b. change into a different element altogether.

Uranium-238 undergoes alpha decay. Therefore, uranium-238 will  change into a different element altogether.

Explanation;

• Unstable atoms undergo radioactive decay in order to achieve stability of their nucleus.
• Uranium-238 is an example of such atom, which may undergo decay to achieve stability.
• Alpha decay is one of the types of decays, others being beta decay and gamma decay. In alpha decay the radioactive isotope undergoes decay such that its mass number is decreased by four and its atomic number is decreased by two.
• Therefore, Uranium-238 undergoes alpha decay to form a different element whose mass number is 234 and atomic number is 90, known as thorium-234.

Answer:

False

Explanation:

Answer: Option (b) is the correct answer.

Explanation:

When an atom shares electrons with another atom then it results in the formation of covalent bond.

Whereas when an atom transfer electrons from one atom to another then it results in the formation of ionic bond.

When nucleus of an atom splits then it represents nuclear fission reaction and energy is released during this process.

For example,

Therefore, we can conclude that out of the given options, the nucleus of an atom is split apart most likely release the greatest amount of energy.

The rate at which molten rock material cools affects the size of the mineral grains. The longer it cools, the larger the crystals become.

What is mineral?

• A mineral is a naturally occurring substance that has distinct chemical and physical properties, composition, and atomic structure.

• An economic mineral is a broader term that includes minerals, metals, rocks, and hydrocarbons (solid and liquid) extracted from the earth through mining, quarrying, and pumping.

• A mineral exists as inorganic element or compound that occurs naturally and has an orderly internal structure as well as a distinct chemical composition, crystal form, and physical properties.

• Quartz, feldspar, mica, amphibole, olivine, and calcite are examples of common minerals. Minerals are elements found on the earth and in foods that our bodies require for normal development and function.

• Calcium, phosphorus, potassium, sodium, chloride, magnesium, iron, zinc, iodine, chromium, copper, fluoride, molybdenum, manganese, and selenium are all necessary for good health.

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