When 0.0075mol of alcohol x are completely burnt in excess oxygen and the gases produced are passed through an excess of limewater (calcium hydroxide solution), 3.0g of calcium carbonate are produced. When X is warmed with acidified potassium dichromate (VI) there is a color change from orange to green. What could be the identity of X?

Answer:

C4H9OH + 6O2 → 4CO2 + 5H2O

Explanation:

Answer:

Explanation:

d because a b and c is in correct

ANSWER

Sodium = 1+

EXPLANATION

Sodium (Na) is a group 1 element with an atomic number of 11

Below is the electronic configuration of sodium

The above configuration shows that sodium has an electron at the outter most shell of the atom which is the valence electron.

For sodium atom to attain it octet state, it needs to release the single electron at it outter most shell

Hence, the ionic charge of sodium (Na) is 1+

Answer:

state ant two rights of women and children in relationships

Equation at the molecular level: Al(NO3)3(aq) + 3NH3(aq) Al(OH)3(s) + 3NH4NO3 (aq). Net-ionic Al(OH)3(s) + 3NH4+ equals Al(3+(aq) + 3NH3(aq) (aq).

A chemical equation called a net ionic equation only includes the ions that are chemically changing during the reaction.

Ion equations are types of chemical equations that solely display the ions involved in a process. In other words, the ions that combine in a solution to react and create new materials The other ions are referred regarded as spectator ions because they don't take part.

The Importance Of Net Ionic Equations-

Three powerful electrolytes are HCl, NaOH, and NaCl. Hence, even though we might write "HCl," we actually mean "H+ + Cl-," as they entirely breakdown into their ions in solution. Likewise, "NaCl" is "Na+ + Cl-," while "NaOH" is "Na+ + OH-."

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Answer:

D

Explanation:

THERE ARE 3 HYDROGEN ATOMS AND 1 NITROGEN SUPPORTING THE FORMULA OF AMMONIA NH3 AND TOTAL ATOMS IS ALSO 4.

Answer:

B.K2(OH)2 i think that is the answer

Answer:  The answer is B. cell

Explanation:

Cells are at the lowest level of organization and the most basic. Cells can be either prokaryotic (without a nucleus) or eukaryotic (with a nucleus).

Remember that for multiplication and division problems, the answer should be recorded to the same number of significant figures as the measurement with the least number of significant figures.

In this case, the mass has 2 significant figures but volume contains 4 significant figures, so the answer needs to have 2 significant figures:

Explanation: The formula unit of KCl is KCl itself. The molar mass of KCl is 74.5513 g/mol1. To calculate the number of formula units in 0.56 grams of KCl, we first need to convert grams to moles using the molar mass of KCl:

0.56 g KCl * (1 mol KCl / 74.5513 g) = 0.00751 mol KCl

Next, we can use Avogadro’s number (6.022 x 10^23) to convert moles to formula units:

0.00751 mol KCl * (6.022 x 10^23 formula units / 1 mol) = 4.52 x 10^21 formula units

Therefore, there are approximately 4.52 x 10^21 formula units in 0.56 grams of KCl.

Answer:

1.44 g

Explanation:

From the question given above, the following data were obtained:

Number of mole of HCl = 0.06 mole

Mass of Mg =?

From the question given above, we discovered the number of mole of HCl is equivalent to the number of mole of Mg. Thus,

Number of mole of Mg = number of mole of HCl

Number of mole of Mg = 0.06 mole

Finally, we shall determine the mass of Mg. This can be obtained as follow:

Number of mole of Mg = 0.06 mole

Molar mass of Mg = 24 g/mol

Mass of Mg =?

Mass = mole × molar mass

Mass of Mg = 0.06 × 24

Mass of Mg = 1.44 g

Therefore, the mass of magnesium is 1.44 g

Answer:

black market '^'

Explanation:

i do not suggest

Answer:

5.5 cups of butter

Explanation: 0.5 x 11= 5.5 cups

First step is to set up the equation and also properly balance it:

2 NH4ClO4 -> N2 + Cl2 + 4 H2O + 2 O2

Now the reaction is properly balanced, so we can focus on what the question is giving and asking. The question gave us 0.090 moles of NH4ClO4 and wants to know how many moles can we make of Nitrogen gas from this, so forget all the other compounds and only look at these 2 molecules. So what is the molar ratio between these 2? 2:1 of molar ratio, because if you look at the equation you will see that with 2 moles of ammonium perchlorate I will have 1 mol of Nitrogen gas, now we can do the following calculation:

2 NH4ClO4 = 1 N2

0.090 NH4ClO4 = x N2

x = 0.045 moles of N2 will be produced

Answer:

hurried

Explanation:

because they retreated back to the couch so hurried.

Answer:

c

Explanation:

Answer:

λ = 4.5×10⁻³⁴ m

Explanation:

Given data:

Energy of photon = 4.42×10⁸ J

Wavelength of photon = ?

Solution:

Formula:

E = hc/λ

speed of light = c = 3×10⁸ m/s

planck's constant = h = 6.63×10⁻³⁴ Js

Now we will put the values in formula.

4.42×10⁸ J = 6.63×10⁻³⁴ Js ×  3×10⁸ m/s  / λ

λ =   6.63×10⁻³⁴ Js ×  3×10⁸ m/s /  4.42×10⁸ J

λ = 19.89×10⁻²⁶ Jm /  4.42×10⁸ J

λ = 4.5×10⁻³⁴ m

Answer:

The heat absorbed is calculated by using the specific heat of water and the equation ΔH=cp×m×ΔT. 4. Water is vaporized to steam at 100oC. The heat absorbed is calculated by multiplying the moles of water by the molar heat of vaporization. To calculate the amount of heat released in a chemical reaction, use the equation Q = mc ΔT, where Q is the heat energy transferred (in joules), m is the mass of the liquid being heated (in kilograms), c is the specific heat capacity of the liquid (joule per kilogram degrees Celsius), and ΔT is the change in temperature

Explanation:

molarity = moles of solute / volume of solution

moles of solute = molarity × volume of solution

moles of solute = 0.245 mol/L × 0.1500 L

moles of solute = 0.03675 mol

moles of solute = 0.0368 mol

-----------------------------------------------------------

Step 1: Calculate the molar mass of solute.

molar mass of solute = (40.08 g/mol × 1) + (35.45 g/mol × 2)

molar mass of solute = 110.98 g/mol

Step 2: Calculate the mass of solute.

mass of solute = moles of solute × molar mass of solute

mass of solute = 0.03675 mol × 110.98 g/mol

mass of solute = 4.08 g

Note: The volume of solution must be expressed in liters (L).

Answer:

\(\boxed {\sf \bold {0.0368 \ mol \ CaCl_2}}}}\)

\(\boxed {\sf \bold {4.08 \ g \ CaCl_2}}}}}\)

Explanation:

Molarity is a measure of concentration in moles per liter.

\(molarity= \frac {moles \ of \ solute}{liters \ of \ solution}\)

In this solution, there are 150.0 milliliters of solution and the molarity is 0.245 M CaCl₂ or 0.245 mol CaCl₂ per liter.

First, convert the milliliters to liters. There are 1000 milliliters in 1 liter.

Now, substitute the known values (molarity and liters of solution) into the formula. The moles of solution are unknown, so we can use x.

\(0.245 \ mol \ CaCl_2 /L= \frac{ x}{0.150 \ L}\)

We are solving for x, so we must isolate this variable. It is being divided by 0.150 L. The inverse of divisions is multiplication, so we multiply both sides by 0.150 L.

\(0.150 \ L *0.245 \ mol \ CaCl_2 /L= \frac{ x}{0.150 \ L} * 0.150 L\)

\(0.150 \ L *0.245 \ mol \ CaCl_2 /L=x\)

The units of liters cancel.

\(0.150 *0.245 \ mol \ CaCl_2 =x\)

\(0.03675 \ mol \ CaCl_2\)

The original measurements have 3 significant figures, so our answer must have the same.

We should round to the ten thousandths place. The 5 to the right of this place tells us to round the 7 up to an 8.

\(\bold {0.0368 \ mol \ CaCl_2}\)

We can convert mass to moles using the molar mass. These values are found on the Periodic Table. They are the same as the atomic masses, but the units are grams per mole (g/mol) instead of atomic mass units.

The solute is calcium chloride: CaCl₂. Look up the molar masses of the individual elements.

Notice that chlorine has a subscript of 2. We must multiply the molar mass by 2.

Add calcium's molar mass.

Use the molar mass as a ratio.

\(\frac {110.98 \ g\ CaCL_2}{ 1 \ mol \ CaCl_2}\)

Multiply the moles of calcium chloride we calculated above.

\(0.0368 \ mol \ CaCl_2 *\frac {110.98 \ g\ CaCL_2}{ 1 \ mol \ CaCl_2}\)

The units of moles of calcium chloride cancel.

\(0.0368 *\frac {110.98 \ g\ CaCL_2}{ 1 }\)

\(4.084064 \ g\ CaCl_2\)

Round to 3 significant figures again. For this number, it is the hundredths place. The 4 in the thousandths place tells us to leave the 8.

\(\bold {4.08 \ g \ CaCl_2}\)

The lewis structure of NO₃⁻ is trigonal planar and the Lewis structure of ozone (O₃) has a resonance form.

Lewis structures which are also often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.

NO₃⁻ has a trigonal planar Lewis structure. It has one nitrogen atom, three oxygen atoms, and covalent bonds holding the three oxygen atoms together. The sp² hybridization of the nitrogen atom gives NO₃⁻- its trigonal planar structure.

Three oxygen atoms make up the oxygen allotrope known as ozone (O₃). One double bond and one single bond make up the Lewis structure of ozone. Additionally, two oxygen atoms in the Lewis structure of O3 carry charges.

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Thomson discovered the electron, the first subatomic particle. In 1904, Thomson proposed atomic model where electrons are embedded within spherically distributed, positive charge (so-called "plum pudding" model).

J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."

☆...hope this helps...☆

_♡_mashi_♡_

When we have an ionic compound we are talking about a compound that has an ionic bonding linking both elements, and these types of bonding will occur mostly with metals (such as Na and Ca) and nonmetals (such as Cl and F).

The main characteristic of this type of bond is the donation of electrons, most of the time the metal will give up on its electrons and the nonmetal will receive the element in order to fill its valence shell, this is how the charges are produced, we will have a positive charge and a negative charge in ionic compounds.

Something particular to this type of bond is that it is considered a very strong bond, where in order to break it a lot of energy is required. The strength of a bond is reflected on the melting and boiling points, since ionic compounds have a very strong bond, the temperature to melt and boil will be high

According to this explanation, the temperature that makes the most sense it will be 115°C, which is the highest temperature from the given options, therefore letter A

The concentration of the solution if the absorbance of the solution at 427 nm is 0.15 and the molar absorptivity of yellow dye at 427 nm is 5.47 × 10-⁶M.

Absorbance in physics is a logarithmic measure of the amount of light that is absorbed when passing through a substance.

It is the capacity of a substance to absorb light of a given wavelength. According to this question, the absorbance of the solution at 427 nm is 0.15.

A = εmCl

Where;

C = 0.15 ÷ (27400 × 1)

C = 5.47 × 10-⁶M

Therefore, 5.47 × 10-⁶M is the concentration of the solution.

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This is due to the fact that a substance's chemical qualities, such as its molecular form, polarity, and functional groups, govern how it behaves and interacts with other substances.

By illustrating the spatial arrangement of atoms and chemical bonds within the molecule, chemical structure establishes the molecular geometry of a compound. In doing so, chemists are given a crucial visual depiction of a chemical formula.

In a chemical reaction, reactants come into contact with one another, atoms in the reactants break their connections with one another, and then the atoms reorganise and form new bonds to create the products.

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The volume of the 0.279 M Ca(OH)₂ solution required to neutralize 24.5 mL of 0.390 M H₃PO₄ is 51.4 mL

2H₃PO₄ + 3Ca(OH)₂ —> Ca₃(PO₄)₂ + 6H₂O

From the balanced equation above,

MaVa / MbVb = nA / nB

(0.39 × 24.5) / (0.279 × Vb) = 2/3

9.555 / (0.279 × Vb) = 2/3

Cross multiply

2 × 0.279 × Vb = 9.555 × 3

0.558 × Vb = 28.665

Divide both side by 0.558

Vb = 28.665 / 0.558

Vb = 51.4 mL

Thus, the volume of the Ca(OH)₂ solution needed is 51.4 mL

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Answer: between 6.5 and 8.5

Explanation:

As shown in my science book it appears in the ph scale

Answer:

M=0.816M

Explanation:

Hello,

In this case, we should consider the following reaction:

\(AgNO_3+KCl\rightarrow KNO_3+AgCl\)

Thus, by knowing the 1:1 molar ratio of silver nitrate and potassium chloride, we can easily compute the moles of silver nitrate precipitating the 1570 mg of potassium chloride considering its molar mass of 74.5513 g/mol:

\(n_{AgNO_3}=1570mgKCl*\frac{1gKCl}{1000mgKCl} *\frac{1molKCl}{74.5513gKCl}*\frac{1molAgNO_3}{1molKCl} \\\\n_{AgNO_3}=0.021molAgNO_3\)

Then, by using the volume of silver nitrate in liters (0.0258 L), we can directly compute the molarity:

\(M=\frac{0.021molAgNO_3}{0.0258L}\\ \\M=0.816M\)

Regards.

Answer:

= 6.21x10^21

Explanation:

It's the train track method, where you try to cancel all the units and end with units that you need. Here we want to end with number of atoms of N.

500 mg N x 1 g N/1000 mg N x 1 mol N/194.19 g N x 4 mol N/1 mol of caffeine x (6.022 x 10^23 particles of N / 1 mol N)

= 6.21x10^21