You are on an alien planet where the names for substances and the units of measures are very unfamiliar.

Nonetheless, you obtain 8 quibs of a substance called skvarnick in units of sleps; not quibs.

9 sleps is equal to 13 quibs.

If you have 8 quibs of skvarnick, how many sleps do you have?

Round your answer to the nearest tenth (one decimal place). Type only the number; not the number and unit

(NH4)2S this is chemcial formula of ammonium sulfide

in 1 mole of ammonium sulfide there are 4*2 = 8 moles of H atoms are present

but in 0.69 moles of ammonium sulfide = 8 * 0.69 =    calculate it

Answer : The number of atoms of hydrogen are [tex]3.32\times 10^{25}[/tex]

Explanation : Given,

Moles of ammonium sulfide = 6.90 moles

The chemical formula of ammonium sulfide is, [tex](NH_4)_2S[/tex]

In ammonium sulfide, there are 2 atoms of nitrogen, 8 atoms of hydrogen and 1 atom of sulfur.

As we know that,

1 mole of substance always contains [tex]6.022\times 10^{23}[/tex] number of atoms.

As, 1 mole of ammonium sulfide contains [tex]8\times 6.022\times 10^{23}[/tex] number of hydrogen atoms

So, 6.90 mole of ammonium sulfide contains [tex]6.90\times 8\times 6.022\times 10^{23}=3.32\times 10^{25}[/tex] number of hydrogen atoms.

Therefore, the number of atoms of hydrogen are [tex]3.32\times 10^{25}[/tex]

Hello!

To find the mass in grams of 100 atoms of carbon, we need to use Avogadro's number, which is 6.02 x 10^23 grams, and divide that by the total number of atoms.

Next, we would need to find how much one mole of carbon weighs. In this case, it is exactly 12 grams.

1. Divide by Avogadro's number

100 / (6.02 x 10^23) ≈ 1.66 x 10^-22  

2. Multiply by one mole of carbon

(1.66 x 10^-22) x 12 ≈ 2.0 x 10^-21

Therefore, the mass of 100 atoms of carbon is equal to about 2.0 x 10^-21 grams.

Answer: Option (C) is the correct answer.

Explanation:

According to collision theory, more is the number of collision between the reactant molecules more will be the rate of reaction.

For example, [tex]Mg + 2HCl \rightarrow MgCl_{2} + H_{2}[/tex]

When we increase the concentration of reactants then it means there is increase in number of molecules. Hence, more is the number of molecules more will be the number of collisions.

Thus, we can conclude that by increasing the concentration of Mg in the reaction mixture we increase the rate of collisions between the reactants in this reaction.

Answer:

C. Increase the concentration of Mg in the reaction mixture.

Explanation:

Answer: Resulting solution will not be neutral because the moles of [tex]OH^-[/tex]ions is greater. The remaining concentration of [tex][OH^-][/tex]ions =0.0058 M.

Explanation:

Given,

[HCl]=0.100 M

[tex][HNO_3][/tex] = 0.200 M

[tex][Ca(OH)_2][/tex] =0.0100 M

[RbOH] =0.100 M

Few steps are involved:

Step 1: Calculating the total moles of [tex]H^+[/tex] ion from both the acids

moles of [tex]H^+[/tex] in HCl

[tex]HCl\rightarrow {H^+}+Cl^-[/tex]

if 1 L of [tex]HCl[/tex]solution =0.100 moles of HCl

then 0.05L of HCl solution= 0.05 [tex]\times [/tex]0.1 moles= 0.005 moles    (1L=1000mL)

moles of [tex]H^+[/tex] in HCl = 0.005 moles

Similarliy

moles of [tex]H^+[/tex] in [tex] HNO_3[/tex]

[tex]HNO_3\rightarrow H^++NO_3^-}[/tex]

If 1L of [tex]HNO_3[/tex] solution= 0.200 moles

Then 0.1L of [tex]HNO_3[/tex] solution= 0.1 [tex]\times [/tex] 0.200 moles= 0.02 moles

moles of [tex]H^+[/tex] in [tex]HNO_3[/tex] =0.02 moles

so, Total moles of [tex]H^+[/tex] ions  = 0.005+0.02= 0.025 moles     .....(1)

Step 2: Calculating the total moles of [tex][OH^-][/tex] ion from both the bases

Moles of [tex]OH^-\text{ in }Ca(OH)_2[/tex]

[tex]Ca(OH)_2\rightarrow Ca^2{+}+2OH^-[/tex]

1 L of [tex]Ca(OH)_2[/tex]= 0.0100 moles

Then in 0.5 L [tex]Ca(OH)_2[/tex] solution = 0.5 [tex]\times [/tex]0.0100 moles = 0.005 moles

[tex]Ca(OH)_2[/tex] produces two moles of [tex]OH^-[/tex] ions

moles of [tex]OH^-[/tex] = 0.005 [tex]\times [/tex] 2= 0.01 moles

Moles of [tex]OH^-[/tex] in [tex]RbOH[/tex]

[tex]RbOH\rightarrow Rb^++OH^-[/tex]

1 L of RbOH= 0.100 moles

then 0.2 [RbOH] solution= 0.2 [tex]\times [/tex] 0.100 moles = 0.02 moles

Moles of [tex]OH^-[/tex] = 0.02 moles

so,Total moles of [tex]OH^-[/tex] ions = 0.01 + 0.02=0.030 moles      ....(2)

Step 3: Comparing the moles of both [tex]H^+\text{ and }OH^-[/tex] ions

One mole of [tex]H^+[/tex] ions will combine with one mole of [tex]OH^-[/tex] ions, so

Total moles of [tex]H^+[/tex] ions  = 0.005+0.02= 0.025 moles....(1)

Total moles of [tex]OH^-[/tex] ions = 0.01 + 0.02=0.030 moles.....(2)

For a solution to be neutral, we have

Total moles of [tex]H^+[/tex] ions = total moles of [tex]OH^-[/tex] ions

0.025 moles [tex]H^+[/tex] will neutralize the 0.025 moles of [tex]OH^-[/tex]

Moles of [tex]OH^-[/tex] ions is in excess        (from 1 and 2)

The remaining moles of [tex]OH^-[/tex] will be = 0.030 - 0.025 = 0.005 moles

So,The resulting solution will not be neutral.

Remaining Concentration of [tex]OH^-[/tex] ions = [tex]\frac{\text{Moles remaining}}{\text{Total volume}}[/tex]

[tex][OH^-]=\frac{0.005}{0.85}=0.0058M[/tex]

Srry if I'm late the answer to the first question about chemical changes is B. when a new substance is formed, it's going to be chemical. For example, when you burn paper, it turns into ash, which is a new substance. The burning is a chemical change. C is wrong because you can undo the mixture.

For number 2, the trick is to check if there is a carbon is double bonded to another carbon. Then it would be unsaturated. You can also check if there's a kink the chain. So therefore,

saturated is 3-methl..  and propane

unsaturated is propyne heptyne and cyclpentene

good luck!

The statement that describes a Chemical changes in hematite is B. The hematite particles rearrange to form a new substance.

The statement that describes a chemical change in hematite is B. The hematite particles rearrange to form a new substance.

A chemical change involves the formation of new substances with different chemical properties.

In this case, the rearrangement of hematite particles leads to the formation of a new substance.

Example: When hematite (Fe2O3) is heated strongly, it undergoes a chemical change and turns into magnetite (Fe3O4).

Learn more about Chemical changes here:

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1] Find out how many moles  

2] Use Avagadro's number to find number of molecules  

1] [2.3 g (NH4)2SO4] x [1 mol (NH4)2SO4] / [132.14g(NH4)2SO4 )] = 0.017406 moles (NH4)2SO4  

2] 0.017406 moles x 6.022 x 10^23 molecules/mole = 1.05 x 10^21 molecules (NH4)2SO4

a. Monatomic ions

Cs is in Group 1. It has one valence electron that it can lose to form a Cs⁺ ion.

Mg is in Group 2. It has two valence electrons that it can lose to form an Mg²⁺ ion.

N is in Group 15. It can gain three valence electrons to complete its octet and form an N³⁻ ion.

b. Ionic compounds

In an ionic compound there must be the same number of positive and negative charges.

It takes three Na⁺ ions to balance the charge on one N³⁻ ion, so the formula of sodium nitride is Na₃N.

It takes three Mg²⁺ ions (charge = +6) to balance the charge on two N³⁻ ions

(charge = -6), so the formula of magnesium nitride is Mg₃N₂.

Magnesium forms a Mg²⁺ cation, cesium forms a Cs⁺ cation, and nitrogen forms an N³⁻ anion. Magnesium nitride, cesium nitride, and magnesium ceside are the ionic compounds formed, with formulas Mg₃N₂, Cs₃N, and MgCs₂, respectively. Ionic compounds must have balanced total charges.

1. (a). First, let's identify the ions that each element forms:

Magnesium (Mg) is in Group 2 of the periodic table and forms a cation by losing two electrons: Mg²⁺. Cesium (Cs) is in Group 1 and forms a cation by losing one electron: Cs⁺. Nitrogen (N) is in Group 15 and forms an anion by gaining three electrons: N³⁻.

1. (b). Next, let's determine the formulas of the ionic compounds these ions can form:

To determine the formulas, I considered the need for ionic compounds to be electrically neutral, meaning the total positive and negative charges must equal zero.

Jon should report his answer to one significant digit only.

When several numbers are multiplied, the number of significant digits in the final answer is determined by the number that has the least number of significant digits.

In this case, 1 has only one significant digit, whereas 2.0 has two, 3.00 has three, and 4.000 has four significant digits. Hence, 1 strongly affects the number of significant figures in the answer.

Answer: A. for those who dont like to read

Explanation:

The nuclear fusion reaction is the source of energy in a star. In nuclear fusion reactions, the nuclei of two atoms combine to create a new atom with the release of a lot of energy. The nuclear fusion reaction takes place in the core of the star where two hydrogen atoms fuse to become one helium atom.

²₁H + ³₁H --> ⁴₂He + ¹₀n + 17.59 MeV

In the fusion reaction above deuterium fuses with tritium to form helium and releases ~18 mega electron volt of energy.

Answer : The correct option is, (3) molecules under the right end of the curve

Explanation :

Evaporation : It is type of process in which the phase changes from liquid state to gaseous state below the boiling temperature of the liquid.

As we know that the higher the temperature of the liquid [tex](T_2)[/tex], the more will be the molecule escaping into the gaseous phase than the lower temperature [tex](T_1)[/tex].

So, the molecules under the right end of the curve are likely candidates for evaporation.

Hence, the correct option is, (3)

Answer: molecules under the right end of the curve

Explanation: smart

Close geometric correspondence of continental coastlines.

Answer:

As explained below

Explanation:

1. Drifting away from the continents due to the pole wandering forces.

2. Jigsaw ft puzzle that coasts of South America and those of Africa have the same geologic and tectonic origin.

3. Presence of large and long mountain chains of mountains and ranges present in all the contents that form a chain.

4. Floral and Faunal evidence found in the lands of South America and Africa and the opening of the s-shaped Atlantic ocean that separated them apart.

5. Presence of similar climatic zones over the continents of the Gondwanaland and the northern Laurentia continent.

Neutrons are very important in provide stability for an atom. When atoms are created by fusion, neutrons are included in this process. Because protons don't like each other and repel each other that's where neutrons come in.

answer: the role of a neutron in an atom holds the center of the atom so it provides the stability of the center of the atom.

hope this helps! ❤ from peachimin

Answer:

B.0.456 g

Explanation:

It is that becuase if u convert miligrams to grams it is 1000mg =1g

By the mass percentage, [tex]100[/tex] grams of the sample would contain

Which corresponds to

Hence the approximate ratio [tex]n(\text{N}) : n(\text{C}) \approx 1 : 1[/tex] and the empirical formula [tex]\text{CN}[/tex].

Apply the idea gas formula to determine the number of moles of the gas molecules present in the [tex]462 \; \text{cm}^{3} = 0.462 \; \text{L} [/tex] sample:

[tex]\begin{array}{lll}n &= & (\text{P}\cdot \text{V}) / (\text{R} \cdot \text{T})\\ & = & 1.01 \times 10^2 \times 0.462 /(8.314 \times 273) \\ &= &0.0206\; \text{mol}\end{array}[/tex]

Thus

[tex]M = m / n = 1.048 / 0.0206 = 51.0 \; \text{g} \cdot \text{mol}^{-1}[/tex]

which is approximately twice of [tex]26.02\; \text{g} \cdot \text{mol}^{-1}[/tex], formula mass for the empirical formula [tex]\text{CN}[/tex]. Hence the molecular formula [tex]\text{C}_2\text{N}_2[/tex]

The molecular formula of the compound is C2N2.

From the ideal gas equation;

PV = nRT

P = 1.01 x 10^5 Pa or 1.01 atm

V = 462 cm^3 or 0.462 L

R = 0.082 atm Lmol-1K-1

T = 273 K

n = ?

n = PV/RT

n = 1.01 atm × 0.462 L/ 0.082 atm Lmol-1K-1 × 273 K

n =0.467 /22.386

n = 0.02086 moles

Now;

Molar mass of the compound  is obtained from;

number of moles  = mass/molar mass

molar mass = mass/number of moles

molar mass =  1.048g/0.02086 moles

molar mass = 50.24 g/mol

The empirical formula of the compound is;

C - 53.8%/12,         N - 46.2%/14

C - 4.48,                 N - 3.3

Dividing through by the lowest ratio

C -4.48/3.3            N - 3.3/3.3

C - 1                       N - 1

The empirical formula is CN

The molecular formula is obtained thus;

[12 + 14]n = 50.24

n = 50.24/26

n = 2

The molecular formula of the compound is C2N2

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Ca has the largest atomic radius because it is further down the periodic table than Mg, and its cation, Ca²⁺, is still larger than Mg²⁺ because it retains an extra shell of electrons.

The atomic radius tends to increase as you move down a group in the periodic table because each successive element has an additional energy level, or shell. Conversely, atomic radius generally decreases as you move from left to right across a period because the effective nuclear charge increases, pulling the electrons closer to the nucleus. In the case of ions, cations (positively charged ions) are smaller than their neutral atoms because they have lost one or more electrons, reducing electron-electron repulsion and allowing the electrons to be pulled closer to the nucleus.

In comparing Mg, Mg²⁺, Ca, and Ca²⁺, we must remember that the neutral atoms will have a larger atomic radius than their respective cations. Between Mg and Ca, Ca is larger because it is lower on the periodic table. However, for the cations, Ca²⁺ is larger than Mg²⁺ because even though they have both lost two electrons, the calcium ion still has an additional shell of electrons compared to magnesium.

Therefore, among the given species, Ca has the largest atomic radius followed by Mg, then Ca²⁺, and finally Mg²⁺ having the smallest atomic radius.

Answer: ca

Explanation: .

Neither plate subducts because the crust have approximately the same density. Instead, the rocks are smashed together causing them to recrystallize due to the intense heat and pressure from the colliding plates.

Start by determining the oxidation numbers of each element on both sides of the equation CuO(s) + H2 (g) → Cu(s) + H2O (l)

Let's start with the reactants.

In the compound CuO(s), the oxidation number of O is -2 and the oxidation number of Cu is +2. (Remember, oxygen's oxidation number is -2 unless it's in a peroxide)

In H2(g) the oxidation number of H is 0 because it is in its elemental form.

Now onto the products

The oxidation number of Cu(s) is 0 because it is in its elemental form

In H2O(l) the oxidation number of oxygen is -2, and the oxidation number of H is +1.

Now let's summarize the change in the oxidation numbers of each element.

Cu: started as +2 and became 0

O: started as -2 and became -2 (didn't change)

H: started as 0 and became +1

To determine which element was oxidized, we look at which element lost electrons, and thus became more positive. So, we can determine that H was oxidized in this reaction, because it started with the oxidation number 0 and became +1.

Answer: you are a god

Explanation:

The correct option is A. which is the concentration of calcium in the myofibril must decrease.

two hydrogen atoms and one oxygen atom. hope this helped.

Answer:

Mg+2     Its D

Explanation:

DDDDDDDDDDDDDDDDDD on edge 2020

Answer:

Its D.

Explanation:

Got it correct in the question.

Final answer:

An atom's Lewis dot structure with two dots indicates that it is Helium (He), which has two valence electrons in its outermost shell, achieving a stable electronic arrangement and typically not forming chemical bonds.

Explanation:

An atom’s Lewis dot structure with two dots indicates it has two valence electrons. The element that fits this description is Helium (He). The number of dots around an element's Lewis symbol represents its valence electrons, which are crucial for forming chemical bonds. Helium's electron configuration is 1s2, meaning it has two electrons in its outermost shell, both of which are depicted as dots in its Lewis dot structure. This structure is a visually simple method to represent valence electrons and predict bonding behavior. Helium, with its two valence electrons completely filling its first and only energy level, achieves a stable electronic arrangement, thus typically does not form chemical bonds with other elements.

Final answer:

An atom's Lewis dot structure with two dots likely represents helium (He), as the number of dots indicates valence electrons, and helium has two valence electrons, completing its outer shell.

Explanation:

An atom's Lewis dot structure with two dots could represent the element helium (He). This is because the number of dots in a Lewis dot structure indicates the number of valence electrons an atom has. Helium is in Group 18 of the periodic table, which is known as the noble gases. These elements are characterized by having a full outer shell of electrons. For helium, which is in the first period of the periodic table, having two valence electrons fills its outer shell, as it only has one shell. Therefore, its Lewis dot structure is represented with two dots, signifying its two valence electrons.

Explanation:

An atom consists of electrons, protons, and neutron. The protons and neutrons are present inside the nucleus whereas the electrons are present outside the nucleus.

These electrons revolve around the nucleus in circular motion. Therefore, an electron pair surrounds the central atom of a molecule. It is known that an electron contains a negative charge and like charges repel each other.

Hence, in an atom the force of repulsion between electron pairs pulls the atoms away from each other.

As a result, a molecules atoms are as far away from each other as they can get.

Answer:

forces between electron pairs push the atom apart

Explanation:

apex

Answer :

Example : In nuclear power plant, the energy released from the process of nuclear fission which is converted into electrical energy that is used in our homes and factories.

Example : This process occurs in the sun and stars. In this, the isotopes of Hydrogen, Tritium and Deuterium combine together to form a neutron and a helium atom under high pressure and temperature.

Answer:- Molar mass of [tex]CO_2[/tex] .

Solution:- It is a stoichiometry problem. Mass of the grill is 30.0 kg and the mass after burning the grill is also 30.0 kg. It means all the charcol is burned and the gas is given off.

2.0 kg of charcol are converted to grams which is 2000 g. Since charcol is pure solid carbon, the grams are divided by the atomic mass of carbon which is 12.

The combustion equation of charcol is written as:

[tex]C(s)+O_2(g)\rightarrow CO_2(g)[/tex]

From this balanced equation, there is 1:1 mol ratio between charcol and carbon dioxide. So, the moles of carbon dioxide gas formed are equivalent to the moles of charcol. To convert the moles of carbon dioxide to grams we multiply the moles by it's molar mass.

Carbon dioxide has one carbon and two oxygen atoms so it's molar mass = 12 + 2(16) = 12 + 32 = 44

So, 44 is the molar mass of carbon dioxide and above calculations clearly shows how and where we get this.

Answer:

0.089.

Explanation:

Cl₂O + H₂O ⇄ 2HClO,

Kc = [HClO]²/[Cl₂O][H₂O].

[H₂O] = 0.077 M , [Cl₂O] = 0.077 M , [HClO] = 0.023 M.

∴ Kc = [HClO]²/[Cl₂O][H₂O] = (0.023 M)²/(0.077 M)(0.077 M) = 0.08922 ≅ 0.089.

Answer:

A

Explanation:

It told me