CHEMISTRY HIGH SCHOOL

Which formula represents an ionic compound?
(1) H2 (3) CH3OH
(2) CH4 (4) NH4Cl

Answers

Answer 1

Answer:

Answer is: (4) NH4Cl.

Name of this chemical copmpound is ammonium chloride.

Ammonium chloride (NH₄Cl) is chemical compound with neutral charge.

1) Hydrogen (H) has oxidation number +1 in compounds with nonmetals (nitrogen and chlorine).

2) Chlorine has oxidation number -1, because ammonium ion (NH₄⁺) has positive charge.

3) In ammonium cation (NH₄⁺), nitrogen has higher electronegativity than hydrogen, so it has negative oxidation number -3:

x + 4 · (+1) = +1.

x = 1 - 4.

x = -3; oxidation number of nitrogen.

Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

Other molecules have covalent chemical bonds.

Answer 2

Answer:

An ionic compound is formed when there is a transfer of electrons between two atoms. The formula for an ionic compound is usually written as the combination of the symbols of the two ions. (4) NH4Cl represents an ionic compound as it follows the criteria of an atom losing or gaining electrons.

An ionic compound is formed when there is a transfer of electrons between two atoms. In an ionic compound, one atom will lose electrons to become a positively charged ion, while the other atom will gain those electrons to become a negatively charged ion. The formula for an ionic compound is usually written as the combination of the symbols of the two ions.

Out of the given options, (4) NH4Cl represents an ionic compound. In this formula, the ammonium ion (NH4+) loses one electron to become positively charged, and the chloride ion (Cl-) gains that electron to become negatively charged.

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How can biomass energy use improve water quality?

Answers

The use of biomass energy can improve water quality by the decrease in soil erosion and sedimentation. When we use energy from biomass, we certainly need biomass and we get most of this biomass from the wastes of crops therefore there is a need of planting more crops. By planting crops, soil erosion and sedimentation is decreased because plants hold the soil and prevent it from washing away with water.

In an ecosystem, the use of biomass energy can improve water quality by the decrease in soil erosion and sedimentation.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

Thus,to improve water quality by the decrease in soil erosion and sedimentation biomass energy is used.

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Which of the following observations led physicist James Chadwick to perform experiments that eventually led to the discovery of the neutron?A. Protons alone were not able to account for the density of an atoms nucleus.

B. Atomic nuclei possess shells similar to the electron shells of atoms.

C. Some atoms contained more protons than electrons.

Answers

The correct answer is letter C. James Chadwick confirmed the existence of neutrons.In his experiment, he was able to show that the particles that were ejected had no electrical charge but had almost the same mass as the proton. These particles were, of course, neutrons.

The bond formed from electrons that are transferred is a(n) ionic bond hydrogen bond covalent bond

Answers

Ionic bonds are formed from electrons completely transferred.

Hydrogen bonds are formed when a hydrogen atom is attracted to an atom with extremely high electronegativity. Hydrogen bonds can only be formed with O, N, or F atoms.

Covalent bonds are formed with the sharing of electrons between atoms.

Answer:A.) ionic bond

Explanation:

Select all that apply. Marie and Pierre Curie's discoveries included: X-rays uranium radium pitchblende polonium

Answers

Marie and Pierre Curie's discoveries included: Polonium and Radium. Marie Curie's death involved her long-term exposure to radiation. I hope this answer helps you on your assignment.

Answer;

Radium
Polonium

Explanation;

Pierre and Marie are known for their work in the study of radioactivity that led to the discoveries of new radioactive elements radium and polonium.

Radium element was named after the Latin word ray and Polonium was named after Marie's home country, Poland.
Element radium was discovered in the form of radium chloride, that was extracted from uraninite.

Oversteepened slopes often lead to mass movements becauseA. the angle of their slope is between 50 and 60 degrees.
B. plants cannot grow on them.
C. the angle of their slope is less than 50 degrees.
D. the angle of their slope is greater than 40 degrees.

Answers

The right answer is D.

The slopes are differentiated by the following criteria:

*The inclination;

*The orientation;

*The shape of the slope.

The slope can be measured by degrees or percentages. In the mountains, it is necessary to measure the inclination of a slope by degrees and not by percentages of inclination.

to make the conversion it is necessary to consider that a slope of 45 ° equals a slope of 100%.

D. the angle of their slope is greater than 40 degrees.

Oversteepened slopes often lead to mass movements because the angle of their slope is greater than 40 degrees.

NOT:
A. the angle of their slope is between 50 and 60 degrees.
B. plants cannot grow on them.
C. the angle of their slope is less than 50 degrees.

Which is bigger mL or quarts