explain why the sun will not explode at any point in its life cycle

Answer:

C

Explanation:

The molecules are farther apart in steam than in water.

Answer:

Radioisotopes are radioactive isotopes of an element. They can also be defined as atoms that contain an unstable combination of neutrons and protons, or excess energy in their nucleus.

Explanation:

Answer & Explanation:  The Ames test examines the mutagenic effects of chemicals ; as such, it detects whether a given chemical can cause a reversion mutation in his- bacteria. While this is the purpose of the test, some of the reversion mutations are not caused by the mutagen being tested  for. The appearance of his revertants in the presence of a non-mutagenic control compound therefore indicates that His+ revertants on the control plate are the result of spontaneous mutation.

Answer:

Explanation:

The solution is a dilute solution of methanol. It is described as a "40% methanol" concentration which means the solution is 40% of methanol in the solution. In this solution, it is 40% of methanol and 60% of water. If any solution is to be prepared from this model, the solution must have 40% of methanol, hence to prepare a 200 mL of the same model (40%) of methanol solution, the volume of methanol would be 80 mL and the volume of water would be 120 mL.

Answer: Low melting points

Explanation:

Answer: The answer is D :)

Explanation:

Answer:

D

Explanation:

The isotope notation : ⁷³₅₃X

Given

53 protons and 20 neutron

Required

The isotope notation

Solution

Isotopes are elements that have the same atomic number with a different mass number

The following element notation,

[tex]\large {{{A} \atop {Z}} \right X}[/tex]

X = symbol of element

A = mass number

   = number of protons + number of neutrons

Z = atomic number

   = number of protons = number of electrons, on neutral elements

So the mass number of element = 53 + 20 = 73

Atomic number = 53

The symbol :

[tex]\large {{{73} \atop {53}} \right X}[/tex]

Answer:

what about carbon paired electrons? what do you need to know about them?

Explanation:

[tex]\huge\boxed{4\ \text{kg/m$^3$}}[/tex]

We know that [tex]\rho=m\div V[/tex], where [tex]\rho[/tex] is density, [tex]m[/tex] is mass, and [tex]V[/tex] is volume.

Substitute in the values we know and solve:

[tex]\begin{aligned}\rho&=8\div2\\&=\boxed{4}\end{aligned}[/tex]

i think its the answer D

Answer:

Liters

Cubic centimeter

Cubic decimeter

Explanation:

The amount of space a matter occupies is the volume of the body. Gases takes up by far the largest amount of space because they fill into any available space.

There are several units of measuring volume but the more common one are:

      Liters, Cubic decimeter and cubic centimeter.

The volume of a body can be derived in many ways. Some by measuring and others by indirect quantification.

Answer:

Explanation:

Now, you know that this solution has a molarity of 6.00 M, which basically means that every liter, which is the equivalent of 1000 mL, will contain 6.00 moles of ammonia. Since we've picked a sample of 1000 mL, you can say that it will contain 6.00 moles of ammonia. To convert this to grams, use the compound's molar mass

Answer:

a lewis acid accepts electron pairs

Explanation:

a p e x

The fact that is true about Lewis acid is that A Lewis acid donates electron pairs. Hence option D is correct.

In chemistry, a Lewis acid is a chemical species that can accept a pair of electrons from another species, known as a Lewis base. Lewis acids are electron pair acceptors.

They can be identified by their tendency to form a covalent bond with a Lewis base by accepting a pair of electrons. This definition of Lewis acids and bases, provided by Gilbert N. Lewis, helped to provide a more comprehensive understanding of chemical reactions beyond the traditional acid-base theory.

Common examples of Lewis acids include metal cations, such as aluminum and boron, and compounds such as carbonyl compounds and acids with a positive charge. Lewis acids play an important role in many chemical reactions, including organic synthesis, coordination chemistry, and acid-catalyzed reactions.

Therefore, option D, A Lewis acid donates electron pairs is correct.

To learn more about Lewis acid:

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Answer:

8.9L is the volume of the gas that must be dissolved.

Explanation:

For a weak base, we can find [(CH₃)₃N] using the equation:

Kb = [OH⁻] [[(CH₃)₃NH⁺] / [(CH₃)₃N]

As [OH⁻] = [[(CH₃)₃NH⁺] and [OH⁻] = 10^-pOH = 3.16x10⁻³M:

6.3x10⁻⁵ = [3.16x10⁻³M][3.16x10⁻³M] / [(CH₃)₃N]

[(CH₃)₃N] = 0.1587M

As the volume is 2.5L, moles are:

2.5L * (0.1587mol / L) = 0.3968moles

Using:

PV = nRT

We can solve for volume of the gas as follows:

P = 1atm at STP; n = 0.3968moles; R = 0.082atmL/molK; T = 273.15K at STP

V = 0.3968mol*0.082atmL/molK*273.15K/1atm

V = 8.9L is the volume of the gas that must be dissolved.

Answer:

4

Explanation:

its a non-metal, dont get confused and pick number 1- it may seem like that’s the answer but remember here we are talking abut the solid phase!

Periodic table is divided into three metals, non metals and metalloids. The non metals are kept on the right side of the periodic table. Th correct option is option D.

Non metals are the element that have property to gain electron. When any element gain electron then element attain negative charge and that element is called anion. The examples of non metals are Oxygen, nitrogen, carbon, Fluorine etc.

The properties of non metals are

Non metals are soft.

Non metals are not malleable that is they can be broken into thin sheets.

Non metals are not ductile they can not be broken into thin wires.

Non metals are brittle in nature that is they can be broken down easily.

Non metals are not lustrous.

Therefore the correct option is option D.

To learn more about non metals, here:

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Answer:

Excellent Electrical Conductors.

Explanation:

(Though I believe some of these answers could be worded better), Most non-metals are terrible conductors of electricity and heat. Nonmetals in solid forms lack luster and can be brittle, and there are semiconductors compared to Metals.

Answer:

Excellent Electrical Conductor, I believe.

Explanation:

Most metals are good electric conductors...

Id wait until somebody else answers to verify my answer.

Answer:

0.42mole

Explanation:

Given parameters:

Number of atoms of titanium  = 2.5 x 10²³atoms

Unknown:

Number of moles  = ?

Solution:

To solve this problem, we must understand that a mole of any substance contains the Avogadro's number of particles.

              6.02 x 10²³ atoms makes up 1 mole of an atom

              2.5 x 10²³ atoms will contain [tex]\frac{2.5 x 10^{23} }{6.02 x 10^{23} }[/tex]   = 0.42mole

Answer:

B The United States

Explanation:

most other countries use the C to measure their temperature

Answer:

1. False

2. True

3. False

4. True

5. True

Explanation:

Answer:

Physical properties such as size, shape, color, density, magnetism or the ability to sink or float can be used to separate the substances in a mixture.. Filtration is when matter is passed through a filter and the larger particles are separated out.

Explanation:

Answer:

write down each element and what you need to know about it repeatedly, and it will burn into your brain

Explanation:

Answer:

12 cuz the atomic number is 12

Explanation:

Answer:

D) cooling of the reaction mixture

Explanation:

Increase in temperature speedens the rate of a chemical reaction

Answer:

D  1.0 g of powdered Zn(s) in 50. mL of 1.0 M HCl(aq) at 30.°C

Explanation:

There are several factors affecting and controlling the rate of chemical reactions.

Some of which are applicable in resolving this problem is the nature of the reactants and their concentration. Also, the temperature of the reaction is also very important.

Answer:

the empirical formula is [tex]H_2NO_2[/tex]

Explanation:

The empirical formula is

The following information is given

It contains 29.17 mass percentage of N

4.20 mass percentage of H

And, 66.63 mass percentage of 0

Now based on the above information, the empirical formula is [tex]H_2NO_2[/tex]

hence, the same is to be considered and relevant too

Considering the definition of empirical formula,  the empirical formula is H₂N₁O₂= H₂NO₂

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers small as possible.

Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass % O.

Assuming a 100 grams sample, the percentages match the grams in the sample. So you have 29.17 grams of N, 4.20 grams of H and 66.63 grams of O.

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

Therefore the H: N: O mole ratio is 2: 1: 2

Finally, the empirical formula is H₂N₁O₂= H₂NO₂

Learn more:

Answer:

c.10 m/s²

Explanation:

By the newton's second law