CHEMISTRY HIGH SCHOOL

In the formula X2O5, the symbol X could represent an element in Group(1) 1 (3) 15
(2) 2 (4) 18

Answers

Answer 1
Answer:

Answer: (3) 15

Explanation: We criss-cross down the oxidation numbers to get the subscripts for the correct formulas. That means the X has an oxidation number of 5. The element with the + oxidation number is always written first so it is +5. Of the groups names, only group 15 has +5 as an oxidation number.

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How many mL of 0.200 M KBr would be required to make a 0.0495 M solution of KBr when diluted to 175.0 mL with water?
Is sand biotic or abiotic
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The metric unit of force is the A. kilogram.
B. newton.
C. gram.
D. nanometer.

Answers

It would be B. newton.
The metric unit of force is Newton (B) with the symbol N and derivation of kg m s-2.

To break a chemical bond, energy must be(1) absorbed (2) destroyed (3) produced (4) released

Answers

Answer: 1) absorbed

Explanation:

As a chemical bond is formed either by transfer of electrons or sharing of electrons, in order to break the forces of attraction among atoms, energy must be absorbed.

Energy is produced or released when  a chemical bond is formed.

Energy is never destroyed, it converts from one form to another.

To break a chemical bond, energy must be \boxed{\left( 1 \right){\text{ absorbed}}}.

Further explanation:

The attraction existing between atoms and molecules that facilitate the formation of various chemical compounds is termed as a chemical bond. It is formed either due to electron transference or by electron sharing between the bonded atoms. The chemical bond formed as a result of electron transfer from one atom to another is known as an ionic bond. The bond formed by the mutual sharing of electrons is called a covalent bond.

Endothermic process

The basic meaning of “endo” is “in”. These processes need energy from the surroundings, generally in the form of heat. Photosynthesis, evaporation of water, sublimation of dry ice, and melting of ice are some of the examples of endothermic processes.

Exothermic process

The general meaning of “exo” is “out”. These processes release energy from the system to the surroundings in the form of heat. Combustion of fuels, thermite reactions, nuclear reactions, and neutralization reactions are some examples of exothermic processes.

Since bond breaking is an endothermic reaction, energy must be supplied or absorbed from the surroundings to the system. Therefore, option (1) is the correct answer.

Learn more:

  1. Which of these is an extensive property? brainly.com/question/1398514
  2. Which of the phase changes is an exothermic change? brainly.com/question/1875234

Answer details:

Grade: High School

Chapter: Chemical reactions

Subject: Chemistry

Keywords: chemical bond, ionic bond, covalent bond, exothermic, endothermic, in, out, heat, photosynthesis, melting of ice, thermite reactions, neutralization reactions.

Which of the following is not an acid? HCl

H2SO4

HNO3

NaOH

Answers

NaOH is not an acid. It is categorized as a base, specifically a strong base, since it has the capability to accept protons from any proton donor and, when it is in aqueous form, it fully dissociates into ions of sodium and hydroxide. 

Any substance that tastes unpleasant in water solution, turns blue litmus paper red, reacts with some metals to release hydrogen, combines with bases to create salts, and stimulates chemical processes is considered an acid. Here among the given options, NaOH is a base. The correct option is D.

Any hydrogen-containing material that has the ability to donate a proton (hydrogen ion) to another chemical is considered an acid. A base is a molecule or ion that can take up an acid's hydrogen ion. Typically, sour tastes help to identify acidic chemicals.

An acid is not NaOH. It is categorized as a base, more specifically a strong base, because it can receive protons from any proton donor and completely dissociates into sodium and hydroxide ions in an aqueous form.

Thus the correct option is D.

To know more about acid, visit;

brainly.com/question/29796621

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Try it
Which statements accurately describe volume? Check all that apply.

Answers

Answer:

Volume is a physical property of an object

One unit of volume is the milliliter

Liquids and solids have constant volumes

Explanation:

Explanation:

what is the question jjsjmwujjduwhfjd

Is Jesus Christ real??

Answers

I don't understand how this is a chemistry Question but if you ask me I will tell you yes he is and that he died for us so that we can be saved from ourselves

yes i think he is real but it is what you think

A sample of a white solid contains 0.212 g of magnesium and 0.140 g oxygen. What is the empirical formula of this compound?

Answers

In determining the empirical formula of a compound, you must convert the mass of each element to moles. Since the given mass for this problem is 0.212 grams of Magnesium and 0.140 grams of Oxygen, just divide the mass by the molar mass of Magnesium (24.305 g/mol) and Oxygen (16 g/mol).You’ll get 0.00872 moles of Magnesium and 0.00875 moles of Oxygen. You then divide the each mole value with the smallest calculated number of moles which is 0.00872. You will get an empirical formula of MgO. 
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