please help me with this.

Answer:

the moon and sun

Explanation:

Answer:

3rd option

Explanation:

Answer:

I think it's 78. I might be wrong I'm not sure.

Explanation:

Answer:

difference in the atoms' electronegativites

Explanation:

hope this helps <333

Answer:

8 Valence Electrons

Explanation:

Answer:

True

Explanation:

Opposite attract when talking about magnets

Answer:

True.

Explanation:

Opposites attract. The two same forces of the north ends repel each other.

Answer:

Natural resources

Explanation:

Answer:

24

Explanation:

52-28=24

Answer: A

Explanation:

Because I just answered it and it’s right. ( Forces between electron pairs push the atoms apart.

Answer:

yes and no, it is possible, but im here and you and be any where in the world.

Explanation:

hope it helps

Answer: Yes, it’s possible if you don’t cry like a baby banana and say ouch !!

Explanation:

Explanation:

Accuracy is the nearness of observed values or measured values to the true value.

The difference between the measured and observed value gives the error incurred during the experimental procedure.

Here are some ways to improve the accuracy of measurements;

Answer:

Pigments themselves are actual particles of color. ... In terms of their chemical composition, one primary distinction between dyes and pigments is that pigments are insoluble in water as well as most other solvents. In general, dyes are either water soluble or soluble in another type of solvent.

Explanation:

Answer:

molecular weight of NH3 or grams This compound is also known as Ammonia. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles NH3, or 17.03052 grams.

No. of moles present in 12 grams of NH₃ are 0.705 moles.

Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.

No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.

Given,

Mass of NH₃ = 12g

one mole of any substance = 6.02214076 × 10²³

Molar mass NH₃ = 17g

17g NH₃ has = 1 mole

1g NH₃ has = (1÷17) moles

12g NH₃ has = 0.058 × 12 moles = 0.705 moles

Therefore, No. of moles present in 12 grams of NH₃ are 0.705 moles.

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Answer:

Solution

Explanation:

Solution

Answer:

Element

Explanation:

An Element cannot be broken down into any other substance or anything smaller. A Element is the Smallest Known Substance in the World.

According to Webster's Dictionary states "Each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms."

Answer:

B)  Decomposition

Explanation:

Decomposition reaction:

It is the reaction in which one reactant is break down into two or more product.

AB → A + B

Chemical equation:

2NO₂    → 2O₂ + N₂

The given reaction is decomposition reaction. NO₂ decomposed to give nitrogen and oxygen. All other options are incorrect because,

Synthesis reaction:

It is the reaction in which two or more simple substance react to give one or more complex product.

Single replacement:

It is the reaction in which one elements replace the other element in compound.

AB + C → AC + B

Double replacement:

It is the reaction in which two compound exchange their ions and form new compounds.

AB + CD → AC +BD

Answer:

where a cold air mass is replacing a warmer air mass. ... The air behind a cold front is noticeably colder and drier than the air ahead of it. When a cold front passes through, temperatures can drop more than 15 degrees within the first hour.

Explanation:

The effects from a cold front can last from hours to days. The air behind the front is cooler than the air it is replacing and the warm air is forced to rise, so it cools. As the cooler air cannot hold as much moisture as warm air, clouds form and rain occurs.

Answer:

The mole is a key unit in chemistry. The molar mass of a substance, in grams, is numerically equal to one atom’s or molecule’s mass in atomic mass units.

Explanation:

I, m right?

Answer:

The scientist is referring to the unusually slow growth rate of carbon dioxide occurring recently. As that slow growth rate ends, the rate of increase of carbon dioxide in the atmosphere should go up soon.

Explanation:This is the exact answer so switch it up.

Answer:

frequency

Explanation:

i took the test

Answer:

Here you go!

Explanation:

Electrons spin around the nucleus in shells. The protons and electrons of an atom are attracted to each other. They both carry an electrical charge.

Answer:

“Atoms are made up of smaller elements, called protons, electrons and neutrons. When electrical and magnetic forces move electrons from one atom to another, an electrical current is formed.”

Hopefully this helps you

Answer: He provided a 3 time period where there families appeal to there conviction.

Answer:

Scientists believe that convection circulation within the mantle helps continents to move. As heat from Earth's innermost layer—the core—transfers to the bottom layer of mantle rock, the rock warms, softens, and rises upward. ... This churning motion in the mantle appears to be a major factor in plate movement.

Explanation:

A machine is a physical system that use power to exert forces, regulate movement, and carry out an activity. Simple machines are very basic and make work easier. This statement is true about simple machine. Therefore, option C is correct.

A machine is a physical system that use power to exert forces, regulate movement, and carry out an activity. The phrase is frequently used to describe both natural biological macromolecules, such as molecular machines, and man-made devices, such as those using engines or motors.

Any tool that simplifies work by adjusting a force is a machine. Every time a force pushes an item over a distance, work is done. Work = Force x Distance is an equation that measures the amount of work that is completed. You exert force on a machine when you operate it.

Simple machines are often used to lift big items with a pulley, to ride a bicycle, or to cut with a pair of scissors. It should be noted that a machine cannot be both a force multiplier and a speed multiplier.

Thus, option C is correct.

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Answer:

See explanation

Explanation:

The number of electrons in each principal energy shell increases as the number of shells increases because more electronic orbitals become available to accommodate the electrons.

For instance, the n= 2 level only accommodates eight electrons in the s and p orbitals whereas the n=3 level accommodates 18 electrons in s, p and d orbitals respectively.

Each principal level accommodates 2n^2 electrons where n= the principal energy shell.

The increase in the number of shell leads to increase in the number of electrons.

The number of electrons in each principal energy shell increase as the number of the shell increases because each cell can accommodate 8 electrons except the first shell which has only 2 electrons. The number of electrons increases when we go down the group due to addition of new shells.

The atom added new shells in the atom if the existing shells fill with electrons and no place is available for the remaining electrons so we can conclude that the increase in the number of shell leads to increase in the number of electrons.

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Answer:

The answer to your question is C. Adding water to its tanks to increase its density.

Explanation:

Have a wonderful day! Sorry if I am wrong but I believe this is correct. Good luck! Plz follow me! Bye!

Oxygen is a chemical element with symbol O and atomic number 8. Classified as a nonmetal, Oxygen is a gas at room temperature.

Answer:

The final pressure of a gas is inversely proportional to the volume change and directly proportional to temperature

Explanation:

Given

[tex]\frac{P_1V_1}{T_1} = k[/tex]

Required

Interpret

[tex]\frac{P_1V_1}{T_1} = k[/tex]

Multiply both sides by T1

[tex]T_1 * \frac{P_1V_1}{T_1} = k * T_1[/tex]

[tex]P_1V_1 = kT_1[/tex]

Divide both sides by V1

[tex]\frac{P_1V_1}{V_1} = \frac{kT_1}{V_1}[/tex]

[tex]P_1 = \frac{kT_1}{V_1}[/tex]

This can be rewritten as:

[tex]P_1 = k\frac{T_1}{V_1}[/tex]

In the above expression; k is a constant of proportionality.

So, the equation can be written as variation as follows:

[tex]P_1\ \alpha\ \ \frac{T_1}{V_1}[/tex]

To interpret:

P varies directly to T (the numerator) and inversely to V (the denominator).