please help me answer this question?

Answer:

m = 19 grams

Explanation:

Given that,

No. of moles, n = 0.8

The molar mass of magnesium, M = 24.305 u

We need to find the mass of 0.80 moles of Mg. We know that given mass to the molar mass is equal to no of moles. Let the mass is m. So,

[tex]n=\dfrac{m}{M}\\\\m=n\times M\\\\m=0.8\times 24.305 \\\\m=19.444\ \text{grams}[/tex]

or

m = 19 grams

So, the mass of 0.8 moles of Mg is 19 grams.

The statements which are true about heterogeneous mixtures are they settle out, they exhibit the tyndall effect and they exhibit brownian motion.

Heterogeneous mixtures are those mixtures in which composition of their constituent partiles are not identical or even, they may vary place to place.

Hence, options (1), (2) & (4) are correct.

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Answer:

A,B,D

Explanation:

i got it right

Answer:

You would weigh less on Uranus than on Earth because Uranus is far less mass-ive and dense than the Earth. This means that there is less gravity. Therefore, you would weigh less.

Explanation:

Even though Uranus is bigger, it is less massive; that is, there is less mass that makes up the planet. The volume of the planet might be larger, but the actual amount of mass isn't.

By the way, you couldn't stand on Uranus. It's made of gas!

This is a simple concept that I can't seem to understand. Why will a strong acid neutralize as much base as a weak acid, if the acids are of the same volume and concentration? A strong acid will dissociate more in solution and thus have a greater number of H+ ions, as far as my understanding goes.

Answer:

first balance the equation:

2SO2+O2=2SO3. BALANCED EQUATION

find the ratio:

2:1:2. SO2:O2:SO3

5.0 moles of SO2 React

1/2×5.0 moles=2.5moles of O2 are needed

The 1.8 moles of the oxygen (O₂) gas are required to react with 3.6 mol SO₂(g).

A chemical equation is a way to represent a chemical reaction in terms of chemical symbols of the reactants and products. The equation in which the number of atoms of chemical substances (reactants and products) is equal on either side of the equation is known as a balanced chemical equation.

Balancing of a chemical equation must follow the law of conservation of mass. The total mass of the elements present on the reactant side must be equal to the total mass of elements present on the product side while obeying this law in a balanced chemical equation.

Given, the chemical equation of the formation of sulphur trioxide is:

2SO₂(g)  + O₂(g)  →  2SO₃(g)

From the above equation, we can say that the two moles of sulphur dioxide react with one mole of oxygen gas to form two moles of sulphur trioxide gas.

3.6 moles of the SO₂(g) react with moles of oxygen gas = 3.6/2 = 1.8 mol

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Answer:

0.0308 g  

Explanation:

i got it right

1 mole of water are contained in the given sample of water of 18.00 grams.

Moles of any substance will be calculated as:

n = W/M, where

W = given or required mass

M = molar mass

In the question given that,

Molar mass of water H₂O = 18 g/mole

Given mass of water H₂O = 18 grams

Now we put all these values in the above equation, we get

Moles of H₂O = 18 grams / 18 g/mole = 1 mole

Hence, option (1) is correct, i.e. 1 mole of water is present.

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Answer:

fractional distillation.

Explanation:

The dissociation of a weaker acid can be suppressed or stopped by the addition of stronger acids which is known as common ion effect

Let's check about group || reagents

[tex]\\ \rm\rightarrowtail H_2S\longrightarrow H^++S^{2-}[/tex]

[tex]\\ \rm\rightarrowtail HCl \longrightarrow H^++Cl^-[/tex]

Here Hydrogen sulphide is neutralized by a stronger acid HCl

The value of the equilibrium constant for the reverse reaction is 5 × 10⁻⁶.

The equilibrium constant is the value of the reaction quotient at equilibrium.

Given that at a certain temperature, the value of the equilibrium constant, K, for the reaction represented above is 2.0 × 10⁵.

We require the equilibrium constant for the reverse reaction at the same temperature.

Let K' be the equilibrium constant for the reverse reaction.

So, we have that K' = 1/K

Substituting the value of K into the equation, we have

K' = 1/K

K' = 1/(2.0 × 10⁵)

K' = 1/2.0 × 1/10⁵

K' = 0.5 × 10⁻⁵

K' = 5 × 10⁻⁶.

So, the value of the equilibrium constant for the reverse reaction is 5 × 10⁻⁶.

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Answer:

A substance made of two or more atoms bonded together is a compound.

I think...

Answer:

Organic compounds contain carbon

Organic compounds CAN be synthesized

Explanation:

The charge on the nucleus is constant.

The number of inner shell electrons being constant causes the shielding effect to remain constant across a period

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Answer:

1.33 moles CO2

Explanation:

The number you are converting is 58.4 g CO2, so you start with this value. The conversion factor is 44.0 g/mol CO2. In order to cross out the grams, the grams must go on the bottom of the conversion factor.

                                  1   mol CO2      
58.4 g CO2   x   --------------------------    =    1.33 moles CO2
                              44.0   grams

The answer has three sig figs.

Answer:

Acids, Bases, and the pH Scale

The terms acid and base describe chemical characteristics of many substances that we use daily. Acidic things taste sour. Basic or alkaline things taste soapy. Strong acids are corrosive and strong bases are caustic; both can cause severe skin damage that feels like a burn. However, mild acids and bases are common and relatively harmless to us. What makes a substance acidic or basic? The following equation is a good place to start:

2 H2O ⇌ 1 H3O+ + 1 OH-

We begin with two water molecules, and move some hydrogen atoms around. One water molecule gains a hydrogen and therefore takes on a positive charge, while the other water molecule loses a hydrogen atom and therefore becomes negatively charged. H3O+ is called a hydronium ion, and it makes things acidic. OH- is called a hydroxyl ion and it makes things basic. However, in water, there is a balance between hydroniums and hydroxyls so they cancel each others' charges. Pure water is neither acidic or basic; it is neutral.

So how does something become acidic or basic? That happens when the hydroniums and the hydroxyls are out of balance. If there are more positively charged hydroniums than negatively charged hydroxyls, then the substance is acidic. If there are more negatively charged hydroxyls than positively charged hydroniums, then the substance becomes basic. pH actually stands for the "potential (or power) of hydrogen."

Note: Sometimes people write H+ as a shorthand for H3O+ and that can cause confusion, because sometimes when people write H+ they really do mean only H+ and not H3O+. Watch out for that, and ask for clarification!

When we dissolve acids in water, we create an excess of hydroniums. When we dissolve bases in water, we create an excess of hydroxyls. Here are two examples. Vinegar, a weak acid, has a chemical formula of CH3COOH. When dissolved in water, it becomes CH3COO- and H+. The H+ ions combine with water molecules to form H3O+ so the solution becomes acidic. Now let's look at lye, a strong base with the chemical formula NaOH (sodium hydroxide). If we add NaOH to water, it dissociates into Na+ and OH-. The sodiums don't do anything important, but the hydroxyls make the solution more basic.

One last question: Why are strong acids and strong bases so nasty? It's because they are out of balance. They either have too many positive charges and are looking for negatives to get back into balance, or they have too many negative charges and are looking for positives to get back into balance. This makes them very reactive with anything they contact. When the positives and negatives are in equal number, they neutralize each other

Answer:

Attract Field lines that curve toward each other show attraction.

Explanation:

Answer:

number of protons in the nucleus, number of energy levels, and the shielding effect.

Explanation:

I hope this helps :)

The properties of ammonium lauryl sulfate that make it a feasible surfactant is its solubility and being able to disrupt hydrogen bonding in water.

They are used as detergents and emulsifiers through to their ability to reduce surface tension between substances.

Hydrogen bonds are the primary contributor to the high surface tension of water which is why their ability to disrupt it makes it to be a good surfactant.

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Answer:

b

Explanation:

because they can't change over 1 day it's takes time

Answer:

b

Explanation:

Specific Mass Conversions Quick Check:

The amount of nitrogen that would produce 68grams of ammonia = 56 g/mol

The atomic mass of nitrogen is = 14 g/mol

2 atoms of nitrogen = 2 × 14 = 28 g/mol

The molecular mass of ammonia produced from 28 g/mol of nitrogen = 2(14+ 3)

= 2 × 17

= 34g/ mol

if 28g of Nitrogen = 34g/mol of ammonia

xg of Nitrogen = 68g/mol of ammonia

Make X the subject of formula,

X ,= 28 × 68/34

X = 1904/34

X = 56 g/mol of Nitrogen

Therefore, 56 g/mol of Nitrogen were present initially.

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Answer:

Explanation:

Before we jump into it, I just want to point out that a microwave oven has two

power ratings.  One is the amount of electrical power it takes from the wall outlet to do its job. The other is the "cooking power" it delivers into the chamber in the form of microwave radiation to heat the meatloaf.  The utility power required from the wall outlet is always more than the cooking power radiated into the chamber.

But we didn't really need to go into all that in order to answer the question.

1 watt = 1 joule per second

1 minute = 60 seconds

(850 watts) x (1 (joule/sec) / watt) x (60sec/min) x (6 minutes) = 306,000 joules  

After one half life, 188mg

46.9 mg of Ba-142

After 5 half lives

After 106 minutes

20 half lives , only 0.000358 mg remains

Hope this helps

The given statement could be filled in as follows:

After one half-life, 188mg

46.9 mg of Ba-142 After 5 half-lives

After 106 minutes 20 half-lives, only 0.000358 mg remains.

Half-life is described as the meantime necessary of 1/2 of radioactive decomposition's sample to break up.

In the given study,

Amount of Radiocontrast dye [tex]= 375 mg[/tex]

Half-life [tex]= 10.6[/tex] minutes

Therefore,

The amount left post 1 half-life = 188 mg

Now,

The amount left post 5 half-lives [tex]= 46.9 mg[/tex]

Lastly,

The amount left post 20 half-lives [tex]= 0.000358 mg[/tex]

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Answer:

It slows down the transfer of thermal energy from outside to inside the coat.

Explanation:

The change in temperature (in °c) of the copper block placed into the water is 67.7 °C

Heat loss = Heat gain

M꜀C(T꜀ – Tₑ) = MᵥᵥC(Tₑ – Tᵥᵥ)

25 × 0.38 (88 – Tₑ) = 500 × 4.184(Tₑ – 20)

9.5(88 – Tₑ) = 2092(Tₑ – 20)

Clear bracket

836 – 9.5Tₑ = 2092Tₑ – 41840

Collect like terms

836 + 41840 = 2092Tₑ + 9.5Tₑ

42676 = 2101.5Tₑ

Divide both side by 2101.5

Tₑ = 42676 / 2101.5

Tₑ = 20.3 °C

ΔT = T꜀ – Tₑ

ΔT = 88 – 20.3

ΔT = 67.7 °C

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