In the nitrite ion (NO2-), __________. A) both bonds are single bonds B) both bonds are double bonds C) one bond is a double bond and the other is a single bond D) both bonds are the same E) there are 20 valence electrons

Answer:

B because they aren’t moving there solid and compacted

Explanation:

I am 5 million iq brainlest pls

Answer:

im not shure sorry

Explanation:

Answer:

the empirical chemical formula of X is CH4

Explanation:Step 1: Imagine you have a sample of compound weighing exactly . Multiply the mass of this sample by the mass percents to find the mass of each element in the sample

Step 2: Divide the mass of each element by the element's molar mass to find the moles of each element in the sample. Remember to round your answers to the correct number of significant digits.  

Step 3: Divide the moles of each element by the the smallest number of moles of any element to find the mole ratio of elements in the sample.  

Step 4: Multiply the mole ratio by the smallest whole number that changes it into a whole number ratio to find the atom ratio of elements in the sample.

Note that the result of each multiplication must equal a whole number only within measurement uncertainty.  

The measurement uncertainty in this calculation comes from the measurement uncertainty of the mass percents given in the question. The mass percents each have significant digits. That means each mass percent has some measurement uncertainty in the third significant digit, and only the first two significant digits can be considered completely reliable.  

In Step 1 you multiplied each mass percent by something with zero uncertainty (the exactly you assumed your sample weighed), in Step 2 you divided by a measurement with more than significant digits (the molar mass of the elements), and in Step 3 you divided by a measurement with the same number of significant digits (the least number of moles of any element in the compound). None of these steps added to the measurement uncertainty of your calculation.  

Therefore, the measurement uncertainty in the final result of all your calculations is determined by the measurement uncertainty in the original mass percents and will be in the third significant digit. That means the result of each of the final multiplication steps must equal a whole number only to within the first two significant digits.  

The whole numbers in the last column of the table are and .  

Answer:

Explanation:

In one mole of carbon, there are 6.02×10^23 atoms. So in two moles, there will be twice that: 1.204×10^24

Answer:

[tex]M=0.638M[/tex]

Explanation:

Hello!

In this case, since the molarity of a solution is calculated by diving the moles of solute by the volume of solution in liters, we first compute the moles of barium hydroxide in 35.5 g as shown below:

[tex]n=35.5g Ba(OH)_2*\frac{1molBa(OH)_2}{171.34gBa(OH)_2}\\\\n=0.207mol[/tex]

Then, the liters of solution:

[tex]V=325mL*\frac{1L}{1000mL} =0.325L[/tex]

Finally, the molarity turns out:

[tex]M=\frac{0.207mol}{0.325L}\\\\M=0.638M[/tex]

Best regards!

Answer:

Erosion can happen very quickly or very slowly.

e.g splash erosion occurs slowly while gulley erosion occurs very fast.

Answer:

The answer is indeed true

Explanation:

Answer:

See explanation

Explanation:

% optical purity = specific rotation of mixture/specific rotation of pure enantiomer  * 100/1

specific rotation of mixture = 23°

specific rotation of pure enantiomer = 61°

Hence;

% optical purity = 23/61 * 100 = 38 %

More abundant enantiomer = 100% - 38 % = 62%

Hence the pure  (S) carvone is (-) 62° is the more abundant enantiomer.

Enantiomeric excess = 62 - 50/50 * 100 = 24%

Hence

(R) - carvone  =  38 %

(S) - carvone = 62%

Answer:

Explanation:

ee= -23/-61 × 100= 38%

S + R = 100%

S - R = 38%

Solve simultaneously;

S= 69% ( excess)

R= 100-69= 31%

The final volume V₂=4.962 L

Given

T₁=20 + 273 = 293 K

P₁= 1 atm

V₁ = 4 L

T₂=100+273 = 373 K

P₂=780 torr=1,02632 atm

Required

The final volume

Solution

Combined gas law :

P₁V₁/T₁=P₂V₂/T₂

Input the value :

V₂=(P₁V₁T₂)/(P₂T₁)

V₂=(1 x 4 x 373)/(1.02632 x 293)

V₂=4.962 L

Answer:

exercise every day and also make healthy choices in his diet

Explanation:

This is going to prevent Xander from getting more overweight and will help him lose some pounds.

This is also something I need to do lol

<3

Answer:

A

Explanation:

Exercise every day and also make healthy choices in his diet

Answer:

yes.row is a answer.I think so.

Answer:

it's the last one

Explanation:

i just did it

Answer:

D on edge

Explanation:

Answer:

[tex]\Delta H=-29.7kJ[/tex]

Explanation:

Hello!

In this case, since the undergoing chemical reaction is:

[tex]N_2+3H_2\rightarrow 2NH_3[/tex]

We first need to identify the limiting reactant given the masses of nitrogen and hydrogen:

[tex]n_{NH_3}^{by\ H_2}=1.96gH_2*\frac{1molH_2}{2.02gH_2}*\frac{2molNH_3}{3molH_2}=0.647molNH_3\\\\ n_{NH_3}^{by\ N_2}=9.51gN_2*\frac{1molN_2}{28.02gN_2}*\frac{2molNH_3}{1molN_2}=0.679molNH_3[/tex]

It means that only 0.647 moles of ammonia are yielded, so the resulting enthalpy change is:

[tex]\Delta H=0.647molNH_3*\frac{-45.9kJ}{1molNH_3}\\\\ \Delta H=-29.7kJ[/tex]

Best regards!

Answer:

C. Their exact amounts are not currently known.

Explanation:

The statement that best describes the availability of nonrenewable energy resources is that their exact amounts are not currently known.

Non-renewable sources of energy are those sources that are subject to exhaustion from usage i.e. cannot replenish itself.

Non-renewable sources unlike their renewable counterparts are exhaustible because they don't replenish themselves over a short time.

Examples of non-renewable sources of energy are:

Therefore, the statement that best describes the availability of nonrenewable energy resources is that their exact amounts are not currently known.

Learn more about non-renewable sources at: https://brainly.com/question/3831884

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Answer:

Explanation:

a) Balanced chemical equation:

C₃H₈ + 5O₂      →        3CO₂ + 4H₂O

b) Mass of oxygen gas needed = ?

Mass of propane = 25 g

Solution:

Number of moles of propane = mass/molar mass

Number of moles = 25 g/  44.1 g/mol

Number of moles = 0.57 mol

now we will compare the moles of oxygen and propane:

                            C₃H₈        :          O₂        

                                1           :            5

                             0.57        :         5/1×0.57 =  2.85 mol

Mass of oxygen:

Mass = number of moles × molar mass

Mass = 2.85 mol × 32 g/mol

Mass = 91.2 g    

c) water vapors produced = ?

Mass of propane = 25 g

Solution:

Number of moles of propane = mass/molar mass

Number of moles = 25 g/  44.1 g/mol

Number of moles = 0.57 mol

now we will compare the moles of water and propane:

                            C₃H₈        :          H₂O        

                                1           :            4

                             0.57        :         4/1×0.57 =  2.28 mol

Mass of water vapors:

Mass = moles × molar mass

Mass = 2.28 mol × 18 g/mol

Mass = 41.0 g

d)

mass of water vapors produced = 1.5 kg (1500 g)

Mass of propane reacted = ?

Solution:

Number of moles of water vapors:

Number of moles = mass/molar mass

Number of moles = 1500 g/ 18 g/mol

Number of moles = 83.33 mol

now we will compare the moles of water and propane.

                            H₂O          :            C₃H₈    

                               4            :              1

                             83.3         :         1/4×83.3 =  20.8 mol

Mass of propane:

Mass = number of moles ×molar mass

Mass = 20.8 mol × 44.1 g/mol

Mass = 917 g

Answer:

1. starting and stabilizing the stir function

2. a medium heat

3.turn up the heat setting

Explanation:

A chemical reaction can be defined as a chemical process which typically involves the transformation or rearrangement of the atomic, ionic or molecular structure of an element through the breakdown and formation of chemical bonds to produce a new compound or substance.

Some of the laboratory apparatus (equipment) used for conducting a chemical reaction are conical flask, Bunsen burner, beaker, tongs, crucible, round bottom flask etc.

When heating a solution to boiling on a hot plate, start by starting and stabilizing the stir function. Then, turn the heat to a medium heat to start. If necessary, turn up the heat setting after waiting about ten minutes without seeing boiling.

The safety precautions that must be taken when heating a solution to boiling on a hot plate;

I. A proper inspection of the round bottom flask for cracks, irregularities or any imperfection.

II. Ensure you avoid heating the flask while it is closed.

III. When suspending the flask on a hot plate, you should ensure that you use a clamp for stability.

Answer:

1.7mL of the stock solution

Explanation:

...Must prepare 550.0mL with a pH of 1.60 at 25°C

...Fill a 550.0mL volumetric flask

...Concentrated stock of 8.0M

... Round the answer to 2 significant digits

First, with pH we can solve [H⁺] = [HCl] concentration that we need to prepare the solution:

pH = -log[H⁺]

1.60 = -log[H⁺]

10^-1.60 = [H⁺]

0.0251M = [H⁺]

That means we need to dilute the concentrated solution from 8M to 0.0251M, that is:

8M / 0.0251M = 318.5 times

As the final volume of the solution is 550.0mL, the volume of the stock 8M HCl solution must be:

550.0mL / 318.5 times =

Answer:

8.78 g of magnesium acetate, Mg(CH₃COO)₂

Explanation:

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

Molarity of Mg(CH₃COO)₂ = 0.247 M

Volume of solution = 250 mL

Mass of Mg(CH₃COO)₂ needed =?

Next, we shall convert 250 mL to L. This can be obtained as follow:

1000 mL = 1 L

Therefore,

250 mL = 250 mL × 1 L / 1000 mL

250 mL = 0.25 L

Next, we shall determine the number of mole of Mg(CH₃COO)₂ in the solution. This can be obtained as follow:

Molarity of Mg(CH₃COO)₂ = 0.247 M

Volume of solution = 0.25 L

Mole of Mg(CH₃COO)₂ =?

Molarity = mole /Volume

0.247 = Mole of Mg(CH₃COO)₂ / 0.25

Cross multiply

Mole of Mg(CH₃COO)₂ = 0.247 × 0.25

Mole of Mg(CH₃COO)₂ = 0.0618 mole

Finally, we shall determine the mass of magnesium acetate, Mg(CH₃COO)₂, needed to prepare the solution. This can be obtained as follow:

Molar mass of Mg(CH₃COO)₂ = 24 + 2[12 + (3×1) + 12 + 16 + 16]

= 24 + 2[12 + 3 + 44]

= 24 +2[59]

= 24 + 118

= 142 g/mol

Mole of Mg(CH₃COO)₂ = 0.0618 mole

Mass of Mg(CH₃COO)₂ =?

Mole = mass / Molar mass

0.0618 = Mass of Mg(CH₃COO)₂ / 142

Cross multiply

Mass of Mg(CH₃COO)₂ = 0.0618 × 142

Mass of Mg(CH₃COO)₂ = 8.78 g

Thus, 8.78 g of magnesium acetate, Mg(CH₃COO)₂, is needed to prepare the solution.

Answer:

-4.29 x 10^-5, -9.3 x 10^-2, and then the least is -1.370 x 10^6

Explanation:

Now use common sense.

-0.093 is the greatest number.

Then -429,000 is in the middle.

Lastly, -1,370,000 is the least number.

Why?

Because as a negative number gets bigger, the more least the number is. It is the opposite of positive numbers. For positive numbers, as a number gets bigger, the more greater the number is. That is a rule.

Hope it helped!

Answer:

Yes

Explanation:

Jupiter is a very large planet. Larger planets usually have stronger gravity, which pulls planets toward each other.

The moons of Jupiter are by Jupiter. (I know, that wasn't a smart thing to say because you know that, but, hey, I had to.) With this being the case, Jupiter is also an inside planet.

- Inside Planets

Planets that are closest to the sun and orbits the sun

There are 2 things that are the cause of the moons of Jupiter not being pulled by earth.

1. Jupiter has strong gravity which pulls the moons, and Jupiter is being pulled by the sun's INCREDIBLE gravity.

2. Earth is an outside planet. It is too far away from Jupiter to attract Jupiter's moons.

- Outside Planet

A planet that is away from the sun, but still orbits the sun

Hope this helps! :D

If you want to know more about the sun, just call on me!!!!

Yes, The moons of Jupiter orbit Jupiter because they are pulled toward Jupiter. The moons of Jupiter are too far to be pulled into Earth'orbit.

A planet's orbit around a star, a natural satellite's orbit around a planet, or an artificial satellite's orbit around a space object or location like a planet, moon, asteroid, or Lagrange point are all examples of curved objects that follow this path.

A planet's orbit around a star, a natural satellite's orbit around a planet, or an artificial satellite's orbit around a space object or location like a planet, moon, asteroid, or Lagrange point are all examples of curved trajectories in celestial mechanics known as orbits.

Around a star, a natural satellite's orbit around a planet, or an artificial satellite's orbit around a space object or location like a planet, moon, asteroid, or Lagrange point are all examples of curved objects that follow this path.

Yes, The moons of Jupiter orbit Jupiter because they are pulled toward Jupiter. The moons of Jupiter are too far to be pulled into Earth'orbit.

To learn more about orbit, follow the link;

https://brainly.com/question/18914648

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Answer:

Explanation:

The mass of the object can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{4}{7.2} \\ = 0.5555555...[/tex]

We have the final answer as

Hope this helps you

pH solution = 8.89

Given

The concentration of HBr solution = 1.3 x 10⁻⁹ M

Required

the pH

Solution

HBr = strong acid

General formula for strong acid :

[H⁺]= a . M

a = amount of H⁺

M = molarity of solution

HBr⇒H⁺ + Br⁻⇒ amount of H⁺ = 1 so a=1

Input the value :

[H⁺] = 1 x  1.3 x 10⁻⁹

[H⁺] = 1.3 x 10⁻⁹

pH = - log [H⁺]

pH = 9 - log 1.3

pH = 8.89

Answer:

Transfer of heat between two objects that are touching.

Explanation:

Conduction is the process by which heat is transferred from one object to another object that is touching and has different temperatures.

Eg: We can use a hot water pack to warm our back. Or While cooking we can feel the conduction process when heat process from the bottom of the pan to the top of the pan

Answer:

A. Transfer of heat between two objects that are touching

Explanation:

1.03 Quiz: Three Kinds of Heat Transfer

I am in K12

Answer:

1. a b c

2. a

3. c

4. west to east

Answer: C- 1.65 moles

Explanation:

HCl = 1 + 35.45 = 36.45 g/mol    

 This should bring you to the periodic table Can i Please have Brainliest

Answer:

The retention factor would be high

Explanation:

The retention factor can be affected by the temperature, or affected by the composition of the solvent, when the FM are liquid.

Heptene is a derivative of the distillation of oil, it is a chemical compound that is made up of seven carbons, that is why it begins with the prefix hept.

Answer:

9.03 x 10²³formula units

Explanation:

Given;

Molar mass  = 56.08g/mol

Number of moles  = 1.5moles

Unknown:

Number of formula units present = ?

Solution:

To solve this problem, we should note that:

      1 mole of a substance contains 6.02 x 10²³ formula units

     1.5mole of CaO will contain 1.5 x 6.02 x 10²³ formula units

                                                     = 9.03 x 10²³formula units

Moles of iron = 7.30

Given

mass of iron = 408.67 g

Required

moles of atoms

Solution

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

mol iron-Fe (Ar = 56 g/mol)

mol = mass : MW

mol = 408.67 g : 56

mol = 7.30