Helppp meee outtttt

Answer:

c

Explanation:

Answer:

An atom changes from a ground state to an excited state by taking on energy from its surroundings in a process called absorption. The electron absorbs the energy and jumps to a higher energy level. In the reverse process, emission, the electron returns to the ground state by releasing the extra energy it absorbed.

Explanation:

so it's c I agree with the person.

Explanation:

neutron- neutral

proton- positive (+)

electron- negative (-)

Answer:

14.3 Litres

Explanation:

Standard temperature and pressure denotes that a gas has the following:

P = 1 atm

T = 273K

According to this question, the mass of CO2 is 28g.

Using mole = mass/molar mass

Molar mass of CO2 = 12 + 16(2)

= 12 + 32

= 44g/mol

Mole = 28/44

= 0.64mol

To calculate the volume of CO2 at STP, we use the general gas law equation as follows:

PV = nRT

R = Gas law constant = 0.0821 Latm/molK

V = nRT/P

V = 0.64 × 0.0821 × 273/ 1

V = 14.3/1

V = 14.3 Litres

Answer:

It is not dependent on the salt solute at all but the solute does have an affect.

Explanation:

in the equation you maybe aware of the I factor which represents the ions present in the solution. a non ionic will always have a I value of 1 a ionic can be 2 like in NaCl. What this means that all non ionic will lower the temperature  depression but ionics will have a greater affect because for example salt breaks into Na and Cl will essentially hae more impurities than glucose which doesnt dissociate and will have a I value of 1

Answer:

I think it's 1

Explanation:

As the balloon rises the gas inside the balloon expands because the pressure surounding the balloon drops.

Answer: B

Explanation:

protons are positive,

electrons are negative,

and neutrons are neutral.

the amount of electrons to protons is always the same in a balanced atom.

electrons can be removed creating "ions" which is simply an unbalanced atom. removing protons would result in a different type of atom or element.

Answer:

Neutron - neutral

Explanation:

This was the correct answer for the test I just took.

Answer:

False, i think

Explanation:

Answer:

The compound silver oxide, Ag₂O has the most silver in one mole of the compound.

Explanation:

From the formula of each of the compounds given:

AgCl₂ : there are one mole of silver atoms for every two moles of chlorine atoms in the compound, silver chloride, AgCl₂

AgNO₃: there are one mole of silver atoms for every one atom of nitrogen and three atoms of oxygen in the compound, silver trioxonitrate (v), AgNo₃.

Ag₂O : there are two atoms of silver for every atom of oxygen in one mole of silver oxide.

AgO : there are one mole of silver atoms for very one mole of iodine atoms in one mole of silver iodide.

Therefore, one mole of silver oxide, Ag₂O has the most silver in one mole of the compound.

Answer:

Explained below.

Explanation:

Formula when magnesium reacts with hydrochloric acid is given by;

Mg(s) + 2HCl(aq) = MgCl2(aq) + H2(g)

So, from the equation, we can see that the gas formed is hydrogen.

This hydrogen gas is collected by a method known as water displacement.

This gas can be tested for by holding a burning splint near to the top of the test container. The resulting effect should be a high pitched pop sound because the hydrogen gas will react with the oxygen gas in the air to result in a small explosion.

Answer:

2.232 g/L

Explanation:

Assuming 1 mol, volume at STP is 22.4 L so you simply divide 50g by 22.4 L to get density

The density of the given gas is required.

The density of the gas at STP is 2.232 g/L.

M = Molar mass of gas = 50 g/mol

1 mole of any gas at STP occupies 22.4 L.

V = Volume per mole = 22.4 L/mol

Density is given by

[tex]\rho=\dfrac{M}{V}\\\Rightarrow \rho=\dfrac{50}{22.4}\\\Rightarrow \rho=2.232\ \text{g/L}[/tex]

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The number of moles of HCl produces 400.0 mL of 1.5M MgCl₂ is equal to 1.20 moles. Therefore, option (C) is correct.

A mole can be defined as a standard unit that is used to find a huge number of quantities of molecules, atoms, ions, or other particular particles.

The number of entities in one mole was found to be equal to 6.023 × 10²³ which is called Avogadro’s constant.

The chemical equation of magnesium and HCl is:

Mg (s) + 2HCl (aq) →  MgCl₂ (aq)  +  H₂(g)

The volume of the MgCl₂ solution, V = 400 ml = 0.4 L

The concentration of MgCl₂ = 1.5 M

The number of moles of MgCl₂ = 1.5 × 0.4 = 0.6 moles

One mole of MgCl₂ is produced from HCl = 2

0.6 moles of MgCl₂ is produced from HCl = 2 × 0.6 = 1.20 moles

Therefore, 1.20 moles of HCl will be reacted to produce 0.6 moles of MgCl₂.

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Answer:

Stannic nitride, Sn3N4

Explanation:

Answer:

The environment can affect an organisms through natural evolution. Example: Spotted moths camouflage with the bark on trees, but black moths do not. So the black moths are eaten and the spotted moths survive. The white moths then pass on their genes to their offspring, so their offspring will also be spotted. Eventually most moths will be spotted. But when the industrial revolution occured, the bark of the trees changed to a darker colour. Therefore the spotted moths were easily seen by predators and were eaten. But the black moths blended in with the bark so they survived. The black moths then passed on their genes to their offspring so most of the moth population had black wings.

Answer:

4.3 moles of Fe2O3

Explanation:

The calculations are shown in the picture.

Answer:

Egg is heterogeneous.

Ranch Dressing is heterogeneous

Windex is homogeneous.

Answer:

Electrons, with a charge of -1.

Explanation:

The nucleus of the atom is composed of protons and neutrons.

The nucleus is where the bulk of the mass of an atom is found.

Electrons orbit the nucleus in various energy levels.

Protons have a charge of +1, neutrons have no charge, and electrons have a charge of -1.

Answer:

1) Assuming you mean Phosphorous Pentoxide (P4O10) there are 6.02x10^23 x 4 (number of P in P4O10) x 5 moles  = 1.38x10^25

2) Divide 1.0x10^20/6.02x10^23 = 1.7x10^-4 moles

3) The balanced equation would be 4P + 5O2 —-> P4O10. Starting with 8 moles of P 8/4 = 2. You generate 2 moles P4O10

4) CH4 has a molecular mass of 12+4 = 16. Starting with 100g/16g/mole = you have 6.25 moles of methane. As there are 4 atoms of hydrogen in each molecule of methane, you multiply 6.25 moles methane by 4 atoms H/molecule and get 25 moles of hydrogen or 1.505e25 atoms of hydrogen

Explanation:

Answer:

its chlorine

Explanation:

beacuse 3+ is a positive ion so we have 20 electrons - 3 electrons=17elecrons

an element with 17 electrons is cl

answer:

the student who answers the riddle will get the prize

explanation:

Answer:

[tex]\boxed {\boxed {\sf d= 25 \ g/mL}}[/tex]

Explanation:

Density is equal to mass over volume.

[tex]\rho=\frac{m}{v}[/tex]

This is the formula used.

The mass is 50 grams and the volume is 2 milliliters.

[tex]m= 50 \ g \\v= 2 \ mL[/tex]

Substitute the values into the formula.

[tex]\rho =\frac{50 \ g }{2 \ mL}[/tex]

Divide.

[tex]\rho= 25 \ g/mL[/tex]

The formula used is ρ=m/v and density is 25 grams per milliliter.

sugar would be a dependent factor

Answer:

I am so sorry I do not know this

Explanation:

Answer:

flourine

Explanation:

im not sure the answer

Answer:

a) acidic; [H+] = 10^-2.5 = 3 x 10^-3

b) basic; [H+] = 10^-11.7 = 2 x 10^-12

c) slightly acidic (almost neutral); [H+] = 10^-6.8 = 1.6 x 10^-7

d) acidic; [H+] = 10^-3.31 = 4.9 x 10^-4

Explanation:

pH < 7 is acidic; pH > 7 is basic; pH = 7 is neutral

[H+] = 10^-pH

A is acidic, B is basic, C is slightly acidic, and D is acidic.

What is pH?

pH, quantitative measure of the acidity or basicity of aqueous or other liquid solutions.

a) Acidic; [[tex]H^+[/tex]] = [tex]10^-^2^.^5[/tex] = [tex]3 X 10^-^3[/tex]

b) Basic; [[tex]H^+[/tex]] = [tex]10^-^1^1^.^7[/tex] = [tex]2 X 10^-^1^2[/tex]

c) Slightly acidic (almost neutral); [[tex]H^+[/tex]] = [tex]10^-^6^.^8[/tex]= [tex]1.6 X 10^-^7[/tex]

d) Acidic; [[tex]H^+[/tex]] = [tex]10^-^3^.^3^1[/tex]= [tex]4.9 X 10^-^4[/tex]

pH < 7 is acidic; pH > 7 is basic; pH = 7 is neutral

Hence, a is acidic, b is basic, c is slightly acidic, and d is acidic.

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