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Answer:

4, 3, 1, 12

It balances now

Answer:

[tex]\boxed {\boxed {\sf 0.5 \ mol \ CaCl}}}[/tex]

Explanation:

Molarity is a measure of concentration in moles per liter.

[tex]molarity= \frac{moles \ of \ solute}{liters \ of \ solution}[/tex]

We know the molarity is 2.0 M CaCl. However, we can convert the units to make the problem easier. 1 molar (M) is equal to 1 mole per liter. A 2.0 M CaCl molarity is equal to 2.0 moles of CaCl per liter.

We also know there are 250 milliliters of solution. however, we need to find the liters. Remember that 1 liter contains 1000 milliliters.

Now we can substitute the values we know into the formula. Since moles of solute are unknown, we can use x.

[tex]2.0 \ mol \ CaCl/ L= \frac{x}{0.250 \ L}[/tex]

Since we are solving for x (the moles of solute), we need to isolate the variable. It is being divided by 0.250 L. The inverse of division is multiplication, so we multiply both sides by 0.250 L.

[tex]0.250 \ L *2.0 \ mol \ CaCl/ L= \frac{x}{0.250 \ L} * 0.250 \ L[/tex]

[tex]0.250 \ L *2.0 \ mol \ CaCl/ L=x[/tex]

The units of liters (L) cancel.

[tex]0.250 * 2.0 \ mol \ CaCl=x[/tex]

[tex]0.5 \ mol \ CaCl=x[/tex]

There are 0.5 moles of solute in 250 milliliters of a 2.0 M solution.

Answer:

205 marbles.

Explanation:

Hello there!

In this case, according to the given information in this problem, it is possible for us to realize that the weight of 15 marbles is 43.35 g and the idea is to calculate the number of marbles in 592.45 g, so we can use the following setup:

[tex]\frac{15marbles}{43.35g} =\frac{x}{592.45g}[/tex]

And we solve for x as follows:

[tex]x=\frac{15marbles*592.45g}{43.35g} \\\\x=205marbles[/tex]

Regards!

Answer:

california y nueva york

Explanation:

Answer:

las partículas se mueven más rápido, y por lo tanto tienen mayor velocidad, por lo tanto mayor impulso y por lo tanto mayor fuerza cuando chocan con las paredes, por lo que la presión aumenta.

Explanation:

Answer:

Aluminum oxide (Al₂O₃)

Explanation:

The standard heat (or enthalpy) of formation of a compound, is the amount of change in the enthalpy that takes place when 1 mole of the compound is produced from the elements it contains whereby the compounds and elements in the reaction are in their standard states

The standard state of an element, is the state in which the element is in the most stable form at a pressure of 1 bar

Therefore, the heat of formation of hydrogen, H₂, oxygen, O₂, and potassium, (K), will have a heat of formation of zero, while Al₂O₃ which is made of aluminum and oxygen in combining to form a compound in proportions which are different from their initial standard states will have a heat of formation not equal to zero

Answer:

5.1 x 10^-3 M

Explanation:

Find number of moles of KOH used

.050 M /L  * .017 L = .00085 moles of KOH

  from the reaction equation, this will react with 1/2 as many moles of Ca 2+

     or   .000425 moles of Ca    <===== in .084 Liter of water

.000425 moles / .084 liter  = .00505 M   =~ 5.1 x 10^-3 M

Answer:

[tex]at \: stp : \\ 22400 \: ml \: are \: occupied \: by \: 71 \: g \: of \: chlorine \\ 563 \: ml \: will \: be \: occupied \: by \: ( \frac{563}{22400} \times 71) \:g \\ = 1.78 \: g[/tex]

Answer:

The bond formed between 2 or more elements by sharing of electrons is called covalent bond

Answer:

107 g

Explanation:

need to divide by avogadro’s number

The mass of a substance is a weight that can be given by the moles. In the sample 107.27 gms of ammonia is present. Thus, option D is correct.

Mass or the weight of the substance can be given by the molar mass and the moles of the substance.

We know,

6.02214076 × 10²³ molecules = 1 mole of NH₃

So, 3.80 x 10²⁴ molecules = 6.31 moles

If 1 mole = 17 gm ammonia

Then, 6.31 moles = 6.31 × 17 = 107 gms

Therefore, option D. 107 gms is the mass of ammonia.

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Explanation:

the tip of a growing plant contains special rapidly diving cells called apical meristem ,these cells are responsible for increase in the length of the plant . if we cut out these cells ,length growth of the plant will be stunned as these cells are not present anyplace else.

This statement is true.

Answer:

true

Explanation:

because solids have strong intermolecular force of attraction so they have definite shape and volume and cannot flow

Answer:

HI

H₂O

H₃O⁺

I⁻

Explanation:

Bronsted-Lowry acids are chemicals that can donate protons, and Bronsted-Lowry bases are chemicals that can accept them. Conjugate bases and acids are the resulting effect of losing or gaining a proton in the form of H⁺.

Answer:

5.702 mol K₂SO₄

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

[Given] 993.6 g K₂SO₄

[Solve] moles K₂SO₄

Step 2: Identify Conversions

[PT] Molar Mass of K: 39.10 g/mol

[PT] Molar Mass of S: 32.07 g/mol

[PT] Molar mass of O: 16.00 g/mol

Molar Mass of K₂SO₄: 2(39.10) + 32.07 + 4(16.00) = 174.27 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 4 sig figs.

5.7015 mol K₂SO₄ ≈ 5.702 mol K₂SO₄

Answer:

0.0102 moles Na₂CO₃ = 1.08g of Na₂CO₃ are necessaries

Explanation:

Based on the reaction

CaCl₂ + Na₂CO₃ → 2NaCl + CaCO₃

1 mole of CaCl₂ reacts per mole of Na₂CO₃

calculate how many moles of CaCl2•2H2O are present in 1.50 g...

To solve this question we must find the moles of CaCl2•2H2O using its molar mass (147.0146g/mol). These moles = Moles CaCl₂ = Moles of Na₂CO₃ necessaries to reach sotoichiometric quantities. To find then the mass we must use molar mass of Na₂CO₃ (105.99g/mol):

Moles CaCl₂.2H₂O:

1.50g * (1mol / 147.0146g) = 0.0102 moles CaCl₂.2H₂O = 0.0102moles CaCl₂

Moles Na₂CO₃:

Mass Na₂CO₃:

0.0102 moles * (105.99g / mol) =

Answer:

5648.4 Joules

Explanation:

This problem can be solved by the calorimetry formula:

Q = C . m . ΔT

where ΔT indicates the change of temperature

Final T°  - Initial T°

m = mass

C = specific heat of water and Q = Heat

We do not have m, but we have the volume of water. We can obtain mass from density.

Volume of water = 10 cm . 4cm . 2.50 cm = 100 cm³

1 cm³ = 1 mL

Density of water = 1 g/mL

Therefore our 100 mL of water is the volume for 100 g. We replace data:

Q = 4.184 J/g°C . 100 g . (32°C - 18.5°C)

Q = 5648.4 Joules

The mass of a substance is the product of its density and volume. Thus, the   mass of the dissolved solids with a density of 125 mg/dm³ with a volume of 250 cm³ is 31.25 mg.

Density of a substance is the measure of its mass per unit volume. Thus it describes how much denser the substance is in a given volume. Mathematically it is the ratio of mass to the volume.

Density of a substance depends on the mass, volume, bond type, temperature and pressure. The ratio of density of a substance with the density of water is called its specific gravity.

It is given that the density of the dissolved solids is 125 mg/dm³ and the volume is 250 cm³ or 0.25  dm³. Thus the mass can be calculated as follows:

density = mass/volume

 mass   = density × volume

             = 0.25  dm³  ×  125 mg/dm³

             = 31.25 mg

Hence, the mass of the dissolved solids in the river wayer is 31.25 M=mg.

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Answer:

A solution with a pOH of 4.3 has a [H+] of 2*10⁻¹⁰ M.

Explanation:

The pOH (or potential OH) is a measure of the basicity or alkalinity of a solution.

pOH indicates the concentration of hydroxyl ions [OH-] present in a solution. It is defined as the negative logarithm of the activity of hydroxide ions. That is, the concentration of OH- ions:

pOH= -log [OH-]

On the other hand, pH is also a measure of the basicity or alkalinity of a solution. POH is an indicator that is related to pH by:

pOH + pH= 14

So, if the solution has a pOH equal to 4.3, the pH is calculated by:

4.3 + pH= 14

pH= 14 - 4.3

pH= 9.7

The pH is defined as the logarithm of the concentration of H+ ions, with the sign changed:

pH= -log [H+]

So, in this case:

9.7= - log[H+]

Solving

[H+]= 2*10⁻¹⁰ M

A solution with a pOH of 4.3 has a [H+] of 2*10⁻¹⁰ M.

Answer:

C: checking your email

Explanation:

I believe that C would be impossible, as you cannot use wireless networks without radio waves

Answer:

energy that's waiting to happen

Explanation:

as an example if you throw a ball up in the air potential energy is going to happen when it comes down that's going to be energy basically I don't know if you get it but it's called potential energy

Answer:

Potential energy is the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.

Explanation:

Answer:

See Explanation

Explanation:

In discussing the reason why Et₃SiCl is more easily hydrolysed than Et₃CCl, we must remember that the electronegativity difference between silicon and chlorine is much higher than the electronegativity difference between carbon and chlorine.

As a result of this, the Si-Cl bond in Et₃SiCl is more polar and hence susceptible to attack by water than the C-Cl bond in Et₃CCl.

Also, it is postulated that the presence of vacant d orbitals on silicon assists hydrolysis in Et₃SiCl. Such vacant orbitals are absent in carbon hence Et₃CCl does not undergo hydrolysis.

The reaction scheme is shown in the image attached to this answer.

Answer:

the answer is 4=Be 9 =F 16=S 17 = CL

Explanation:

atomic no 4 = beryllium (Be)

" " 9 = fluorine (F)

16 = sulfur (S)

17 = chlorine (CL)

The atomic number of Beryllium is 4, the atomic number of fluorine is 9,  atomic number of sulfur is 16 and the atomic number of chlorine is 17.

The atomic number is defined as the number of protons in the nucleus of an atom or the number of electrons revolving around the nucleus in orbits or shell.

So we can conclude that he atomic number of Beryllium is 4, the atomic number of fluorine is 9,  atomic number of sulfur is 16 and the atomic number of chlorine is 17.

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Answer:

the argon because 40/4 = 10

Answer:

The correct answer is - DNA (check image).

Explanation:

In this diagram, The W mark is the nucleus of the cell X is the chromosome Y represents the DNA and Z is the gene. Gene is the segment of the DNA and DNA is the pat of the chromosome with histone. Chromosomes are present in the nucleus of the cell. These all are the structures of the genetic structures.

Thus, the correct answer is - DNA.

Answer:

dna

Explanation:

edge

Answer:

Option 1

Explanation:

p can hold upto 6 e-.

It would be easy if it gains 2e-, instead of losing 4e-, to be stable.

It gains 2e, and gets a charge of - 2e.

It forms O (2-)

Answer:

pH = 5.37

Explanation:

We'll begin by obtaining the concentration of the hydrogen ion in the solution. This can be obtained as follow:

HNO₃ (aq) —> H⁺ (aq) + NO₃¯ (aq)

From the balanced equation above,

1 mole of HNO₃ produced 1 mole of H⁺.

Therefore, 4.3×10¯⁶ M HNO₃ will also produce 4.3×10¯⁶ M H⁺.

Finally, we shall determine the pH of the solution. This can be obtained as follow:

Concentration of Hydrogen ion [H⁺] = 4.3×10¯⁶ M

pH =?

pH = –Log [H⁺]

pH = –Log 4.3×10¯⁶

pH = 5.37

Therefore, the pH of the solution is 5.37

Answer:

Check the answer from course hero or quizlet!

Answer:

the nature of reactants is different from the other factors that affect rates because it explains the difference in rates of two different reactions but cannot be used to make one reaction faster or slower...

in both cases, a single displacement reaction occurs between a mental and water .

Answer:

It is formed between two atoms of the same elements having same electronegativity in which the bonding electrons are equally shared between them. In this case, the centre of the positive charge coincides with the centre of the negative charge in theecular molecule. H, N: 0. etc. are the molecules in which non polar covalent bonds invalved. These substances are called non polar substances.

Answer:

A nonpolar covalent bond is a covalent bond in which the bonding electrons are shared equally between the two atoms. In a nonpolar covalent bond, the distribution of electrical charge is balanced between the two atoms.

Explanation:

Answer:

20 x (6.022 x 10^23) atoms in 20 moles of Calcium.

Explanation:

A mole contains 6.022 x 10^23 atoms, which is also known as Avogadro's number, and this number is same for each element. So, there are 20 x (6.022 x 10^23) atoms in 20 moles of Calcium.

The number of atoms are there in 20 moles of calcium is 120.4 × 10²³.

Avogadro's number is the number which is equal to the number of atoms of any substance that are present in one mole of that substance, and it is equal to 6.022 × 10²³.

Given moles of calcium = 20 moles

So, number of atoms in given moles of calcium will be calculated as:
No. of Ca in 20 mol = 20mol × 6.022 × 10²³ atoms/mol = 120.4 × 10²³ atoms

Hence required atoms of calcium is 120.4 × 10²³.

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