CHEMISTRY HIGH SCHOOL

Which elements combine by forming an ionic bondA) Sodium and potassium
B) Sodium and oxygen
C) carbon and oxygen
D) Carbon and sulfur

Answers

Answer 1
Answer:

Answer:

B) Sodium and oxygen

Explanation:

Ionic bond: This type of bond is formed when there is a complete transfer of electrons from one element to another element. Ionic bond is the bond which is formed between the two oppositely charged ions and are held by the strong electrostatic attraction. This is formed between the atoms which have high differing electronegativities. In this bonding one element is always a metal and another is a non-metal.

Thus,

Out of the options, B involves a metal and a nonmetal which is sodium and oxygen respectively. Thus, they can form a ionic bond on combining.

A) represents 2 metals, C) and D) represents 2 nonmetals and thus, they cannot form an ionic bond.
Answer 2
Answer: Ionic bonds will always form between Non-Metals and Metals. 

So the only NM + M is B

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We can also use the activity series to predict reactions between a metal and an acid. what are the products of the reaction fe(s) + h2so4(aq)?

Answers

Answer;

FeSO4 (aq) + H2 (g)

Explanation;

The reaction between iron and dilute sulfuric acid gives a salt and hydrogen gas. (iron (ii) sulfate and hydrogen gas).

The equation for the reaction is;

Fe(s) + H2SO4 (aq) = FeSO4(aq) +H2(g)

The recommended daily requirement of calcium is1,000 mg. Tap water in a Midwestern city contains approximately 150 mgCa/L. A person living in the city who drinks two liters of water in oneday would receive ________ percent of his/her RDA of calcium. A. 3
B. 7.5
C. 15
D. 30

Answers

The answer is D. 30 percent

Which statement is true concerning the reaction N(g) + N(g) → N2(g) + energy? A bond is broken and energy is absorbed.
A bond is broken and energy is released.
A bond is formed and energy is absorbed.
A bond is formed and energy is released.

Answers

Answer:

A bond is formed and energy is released.

Explanation:

Given a reaction equation, the elements which we have on the left side of the arrow are called the reactants and the elements which we have on the right side are called the products.

In this exercise, the reactants are N(g) and N(g) and the products N2(g) and energy.

After the reaction took place, N(g) and N(g) disappeared and instead N2(g) was formed. We can conclude that a bond was formed between both N(g).

Also, in the products certain amount of energy was released (because we have it on the products side)

The correct option is ''A bond is formed and energy is released''

How is the size of the mineral grains affected by the rate at which molten rock material cools?

Answers

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.

To learn more about mineral, refer to:

brainly.com/question/15844293

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When a mineral cools very quickly, the grain size will be tiny. When a mineral cools very slowly, the grain size will be large.

When comparing bromine to chlorine, bromine hasA. Fewer protons in its nucleus.
B. A weaker effective nuclear charge
C. More valence electrons
D. More electron shielding

Answers

Explanation:

I'm pretty sure the answer is D

All atoms try to achieve---------------(minimum energy,stable energy,maximum energy,covalent energy)

Answers

Answer:

minimum energy

Explanation:

minimum energy means maximum stability

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