Can Some One Please Help Me

Answer:

32

Explanation:

0.56dm of gas has 0.8g

22.4dm of gas Z has a mass of 22.4/0.56X0.8

the relative molecular mass of gas Z is 32

Answer:

D

Explanation:

The answer is D. I'm not sure that it is a solid. I don't think it is a ppte, which is the only way it can be a true solid. It is ionic if the reaction is taking place in water and there is someway to start the reaction. Be that as it may, the internal balace numbers of the chemical produced is the only possible answer. The balanced eq;uatioon is

2Al + 3Br2 ==> 2AlBr3

Answer:

C.[tex]3.8\times 10^{-2}[/tex]

Explanation:

We are given that

Initial concentration, [tex][A]_o=4.3 M[/tex]

First half life, [tex]t_{\frac{1}{2}}=56[/tex]minutes

Second half life, [tex]t'_{\frac{1}{2}}=28[/tex]minutes

We have to find K.

The given reaction is zero order reaction.

We know that for zero order reaction

[tex]t_{\frac{1}{2}}=\frac{[A]_o}{2k}[/tex]

Using the formula

[tex]56=\frac{4.3}{2k}[/tex]

[tex]k=\frac{4.3}{2\times 56}[/tex]

[tex]k=3.8\times 10^{-2}[/tex]

Hence, option C is correct.

Zero-order reactions are the reactions when a surface or a catalyst is required for the reaction to proceed and is saturated by the reactant chemicals. The result of the concentration versus the time plot will be a straight line in a zero-order reaction.

[tex]3.8 \times 10 ^{-2}[/tex] is the value of k.

Given,

The given reaction in the question is of zero-order and for that, we know that,

[tex]t \dfrac{1}{2} = \dfrac{[A_{0}] }{2\;\rm k}[/tex]

Substituting the values in the equation we get:

[tex]\begin{aligned}56 &= \dfrac{4.3 }{2\; \rm k}\\\\\rm k &= {4.3 }{2 \times 56}\\\\\rm k &= 3.8 \times 10^{ -2}\end{aligned}[/tex]

Therefore, option C is correct.

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Answer:

It increases as the size of the ions decreases.

It increases as the charge on the ions increases.

It is a measure of the strength of the bonds between ions in a compound.

Explanation:

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Option A correctly represents the structure of carbonic acid.

Carbonic acid is a compound that is composed of three elements which are carbon, hydrogen and oxygen. This compound is important in the production of carbonated soft drinks that are usually sold in shops. There are three atoms of oxygen, two atoms of hydrogen and one atom of  carbon in the compound.

Now, we can see in the question that red refers to atoms of oxygen, grey refers to atoms of hydrogen and ash refers to the atoms of carbon. We now want to know which diagram represents the structure of carbonic acid.

From the images, we can see that option A correctly represents the structure of carbonic acid.

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Answer:

[tex]{ \tt{kelvin = 273 + celcius \: degree}} \\ { \boxed{ \bf{celcius = kelvin - 273}}}[/tex]

Answer:

To convert Kelvins into Celsius degrees, the formula is K − 273.15 = °C

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Answer:

936.97 KPa

Explanation:

We'll begin by calculating the number of mole in 45.6 g of CO₂. This can be obtained as follow:

Mass of CO₂ = 45.6 g

Molar mass of CO₂ = 12 + (16×2)

= 12 + 32

= 44 g/mole

Mole of CO₂ =?

Mole = mass /molar mass

Mole of CO₂ = 45.6 / 44

Mole of CO₂ = 1.04 mole

Next, we shall convert 25.0 °C to Kelvin temperature. This can be obtained as follow:

T (K) = T (°C) + 273

T (°C) = 25.0 °C

T (K) = 25.0 °C + 273

T (K) = 298 K

Finally, we shall determine the pressure. This can be obtained as follow:

Mole of CO₂ (n) = 1.04 mole

Volume (V) = 2.75 L

Temperature (T) = 298 K

Gas constant = 8.314 KPa.L/Kmol

Pressure (P) =?

PV = nRT

P × 2.75 = 1.04 × 8.314 × 298

P × 2.75 = 2576.67488

Divide both side by 2.75

P = 2576.67488 / 2.75

P = 936.97 KPa

Thus, the pressure is 936.97 KPa

Answer:

C. It has the highest rate of reaction. Copper has the highest TSA/V and concentrated nitric acid has huggest num of solute

Answer:

A chemical property is a characteristic of a substance that may be observed when it participates in a chemical reaction. Examples of chemical properties include flammability, toxicity, chemical stability, and heat of combustion

Answer:

The diagram shows three isotopes. What element is represented?

A. hydrogen

B. helium

C. lithium

A. hydrogen

A. Is The Correct Answer

Answer:

C. An electron can only change its mass in quantized amounts when it gains or loses energy.

Explanation:

Answer:

2moles of hydrogen and 1 mole of oxygen in the reactants

Answer:

number of moles of the substance

Explanation:

Explanation:

The mass of a pot is 300g and contains 90% aluminum. Find the number of moles of aluminum in the pot. P.A. (Al = 27)

The mass of aluminum present in the pot is:

[tex]300 g * 90/100\\=270 g[/tex]

Hence, in the given pot 270g Al is present.

[tex]Number of moles of Al=\frac{given mass ofAl}{its molar mass}[/tex]

The gram atomic mass of Al -27 g/mol

Given the mass of Al is 270 g

Substitute these values in the above formula:

[tex]Number of moles of Al=\frac{given mass ofAl}{its molar mass}\\=\frac{270 g}{27 g} \\=10.0 mol[/tex]

Answer is 10.0 mol of Al is present.

Answer:

Q,N,1) lithium + hydrochloric -> lithium chloride + Hydrogen.

Answer:

I believe it's salt and water

Explanation:

not sure

Answer:

Mixture is a electronic device used to peel the things such as onion ,tomato,ginger, garlic etc.

Answer:

Cuando se unen un átomo de calcio y un átomo de bromo, forman bromuro de calcio que se compone de Ca2 + y 2Br-. El tipo de enlace que se forma es el enlace iónico.

Answer:

Explanation:

C = 41.4/12 = 3.43

H = 3.47/1 = 3.47

O = 55.1/16 =3.44

CHO is the skeletal formula (divide each by the lowest number above). The results are close enough to 1 to be 1.

(CHO)_x = 116

C + H + O = 29

(29) _ x = 116

x = 116/29

x = 4

So there area 4 carbons 4 hydrogens and 4 oxygens.

The correct formula is C4H4O4

Answer:

horizontal

Explanation:

Answer:

It's me mario

Explanation:

Answer:

150g

Explanation:

Assuming they are ideal gases at the same temperature and pressure, equal moles of gasses have equal volume. IN this case, if we have 10g of hydrogen gas, that is 5 moles of H2 gas. That means 5 moles og NO2 will occupy the same volume which is 5*(14.0 + 16.0*2) =  230 g

Answer:

"If you lower the kinetic energy of a gas its temperature will decrease because temperature is a measure of the average kinetic energy of a substance."

Explanation:

Answer:

Denaturation is what happens when heat is applied to the eggs. ... The heat coming from your stove denatures the protein by disrupting some of its bonds that held the molecule into shape. In the case of hard-boiled eggs, the proteins clump together and solidify, causing the egg white and yolk to harden.

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Since uranium - 235 decays by alpha decay, the thief runs a risk of exposure to alpha decay.

Radioactive decay is the sponteanous disintergration of a nuclide to yiled daughter nuclide and release energy.

We can see the decay of Uranium -235 in the image attached to this answer. Hence, it then follows that the theif here runs the risk of exposure to alpha decay.

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Answer:

D. Prolideration

Explanation:

Just took the test

Answer:

i dont no this one plz the question is hard

Answer:

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Explanation:

According to the 2n2 rule, the maximum number of electrons in the third period = 2 x (3)2 = 18. But, the last shell cannot accommodate more than 8 electrons so, the number of electrons in third period is 8. Hence, the number of elements is also 8.

Answer:

If an atom has the same number of electrons as protons, it is a neutral atom.

Explanation:

[tex]\large \mid \underline {\bf {{{\color{navy}{Ruthenium \: \: oxide...}}}}} \mid[/tex]

Answer:

Hyponym is the another name for hard water.

Explanation:

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