what is 2 multiplied by 4
​

Answer:

kf

Explanation:

when liquid water changes into solid ice, it increases in mass

Answer:

The right response will be "No".

Explanation:

Answer:

1.91×1021/6.023×10^23

Explanation:

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Answer:

2.5 meter per second

Explanation:

momentum = mass multiplied by velocity

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The molar mass of B(NO₃)₃ - Boron nitrate : 196.822 g/mol

In stochiometry therein includes  

Relative atomic mass (Ar) and relative molecular mass / molar mass (M)  

So the molar mass of a compound is given by the sum of the relative atomic mass of Ar  

M AxBy = (x.Ar A + y. Ar B)  

The molar mass of B(NO₃)₃ - Boron nitrate :

M B(NO₃)₃ = Ar B + 3. Ar N + 9.Ar O

M B(NO₃)₃ = 10.811 + 3. 14,0067 + 9. 15,999

M B(NO₃)₃ = 196.822 g/mol

Answer:

V₂ = 106.5 mL

Explanation:

Given data:

Initial volume =200 mL

Initial pressure = 2 atm

Initial temperature = 35 °C (35 +273 = 308 K)

Final temperature = 55°C (55+273 = 328 K)

Final volume = ?

Final pressure = 4 atm

Formula:  

P₁V₁/T₁ = P₂V₂/T₂  

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

V₂ = P₁V₁ T₂/ T₁ P₂  

V₂ = 2 atm ×200 mL × 328 K / 308 K ×4 atm

V₂ = 131200 atm .mL. K / 1232 K.atm

V₂ = 106.5 mL

Answer:

The chemistry between you will be instant. Sometimes it may be hard to know if they like you back. Knowing that you can not live without them and that you bump in to each other everywhere you go, is fate at work. You might also just need the courage to ask them out. You never know what will happen if you try. :)

Answer:

You will feel it

Explanation:

Answer:

not

medium

Explanation:

Light radiation travels as a wave and does not require a medium for travel. Like all electromagnetic radiations, light does not need medium particles for its propagation.

Answer:

2 option

Explanation:

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Answer:

Ring is made up off copper.

Explanation:

Given data:

Mass of ring = 89.2 g

Volume of water = 10 mL

Volume of water + ring = 20 mL

Ring is made up of = ?

Solution:

Volume of ring = (Volume of water + ring) - Volume of water

Volume of ring = 20 mL - 10 mL

Volume of ring = 10 mL

Density:

Density = mass/volume     ( 1 mL = 1 cm³)

d = 89.2 g/  10cm³

d = 8.92 g/cm³

Thus, ring is made up off copper.

Answer: P represents electrical energy, Q represents thermal energy.

Explanation: The toaster takes electrical energy from the electrical socket through wires and converts that into thermal energy that heats up/toasts the bread.

Answer:

P represents electrical energy, Q represents thermal energy

Explanation:

I am sorry if I get this wrong, but when I put it in the sentence - A toaster transforms electrical energy into thermal energy - it made sense to me, so I think that is the answer. I am sorry if this does not help.

Answer:

Light and heat

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Answer:

Light and Heat

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Explanation:

Thx for the point though

Answer:

30 grams

Explanation:

I got 40 wrong so I picked 30

Answer:

30 grams

Explanation:

I did the ck12

The concentration of the Nitric acid solution : 0.114 M

Titration is a procedure for determining the concentration of a solution (analyte) by reacting with another solution whose known concentration (usually a standard solution) is called the titrant. Determination of the endpoint/equivalence point of the reaction can use indicators according to the appropriate pH range  

Titrations can be acid-base titration, depositional titration, and redox titration. An acid-base titration is the principle of neutralization of acids and bases  

Reaction

HNO₃ + NaOH → NaNO₃ + H₂O​

Concentration a standard solution  of sodium hydroxide :  0.0998 mol/dm³ , and the volume = 25 cm³

moles NaOH=

[tex]\tt mol=M\times V\\\\mol=0.0998\times 25\\\\mol=2.495~mlmoles[/tex]

From the equation, mol ratio HNO₃ : NaOH = 1 : 1, so mol HNO₃ = mol NaOH=2.495 mlmoles

The volume of HNO₃ = 21.8 cm³, so the concentration :

[tex]\tt M=\dfrac{n}{V}\\\\M=\dfrac{2.495}{21.8}\\\\M=0.114[/tex]

The concentration of the nitric acid solution is 0.11445 mol/dm³

From the question,

We are to calculate the concentration of the nitric acid solution

The given balanced chemical equation for the reaction is

HNO₃ + NaOH → NaNO₃ + H₂O​

This means 1 mole of HNO₃ is needed to completely neutralize 1 mole of NaOH

Using the formula

[tex]\frac{C_{A}V_{A} }{C_{B}V_{B}} = \frac{n_{A}}{n_{B}}[/tex]

Where [tex]C_{A}[/tex] is the concentration of acid

[tex]C_{B}[/tex] is the concentration of base

[tex]V_{A}[/tex] is the volume of acid

[tex]V_{B}[/tex] is the volume of base

[tex]n_{A}[/tex] is the mole ratio of acid

[tex]n_{B}[/tex] is the mole ratio of base

From the given information

[tex]C_{B}= 0.0998\ mol/dm^{3}[/tex]

[tex]V_{A} = 21.80 \ cm^{3}[/tex]

[tex]V_{B} = 25.0 \ cm^{3}[/tex]

From the balanced chemical equation

[tex]n_{A} = 1[/tex]

[tex]n_{B} =1[/tex]

Putting the parameters into the formula, we get

[tex]\frac{C_{A} \times 21.80 }{0.0998 \times 25.0} = \frac{1}{1}[/tex]

Then,

[tex]C_{A} \times 21.80=0.0998 \times 25.0[/tex]

∴ [tex]C_{A}=\frac{0.0998 \times 25.0}{21.80}[/tex]

[tex]C_{A} =\frac{2.495}{21.80}[/tex]

[tex]C_{A} = 0.11445 \ mol/dm^{3}[/tex]

Hence, the concentration of the nitric acid solution is 0.11445 mol/dm³

Learn more here: https://brainly.com/question/14014457

Answer:

3.37 × 10²³ molecules

Explanation:

Given data:

Mass of C₆H₁₂O₆ = 100 g

Number of molecules = ?

Solution:

Number of moles of C₆H₁₂O₆:

Number of moles = mass/molar mass

Number of moles = 100 g/ 180.16 g/mol

Number of moles = 0.56 mol

Number of molecules:

1 mole contain 6.022 × 10²³ molecules

0.56 mol × 6.022 × 10²³ molecules /1 mol

3.37 × 10²³ molecules

Answer:

Explanation:

The potential energy of a body can be found by using the formula

PE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 9.8 m/s²

From the question we have

PE = 40 × 9.8 × 10

We have the final answer as

Hope this helps you

Electron pairs around a central atom arrange themselves so that they can be as far apart as possible from each other. The repulsion between negatively charged electrons pairs in bonds or as lone pairs causes them to spread apart as much as possible

Explanation:

Ao H+HH OH

santa said he will eat shower curtian at 2 am

Answer:

a one rotation of the planet on its axis

Explanation:

The two types of motion that planets undergo are;

1) rotation of the planet about its axis

2) revolution of the planet around the sun.

In every planet there are days as shown in the image attached to the question. However, the length of day in each planet is determined by the time required for the planet to complete one rotation on its axis.

It takes the earth 1 earth day (24 hours) to complete rotation on its axis.

Answer:

A-bone cell, bone cell C-bone tissue, bone cell bone tissue, femur, skeleton, dog B-dog.

Explanation:

It is ordered from the smallest unit (tissue microstructure) to a tissue or organ that are considered macrotisular structures.

The equilibrium constant(Kc) is equal to the concentration of the products over the concentration of the reactants, and each coefficient of the compound in an equilibrium state

The equilibrium constant or Kc is the value of the concentration product in the equilibrium state of the substance in the right segment divided by the product of the substance in the left section, each of which has a reaction coefficient raised

solid (s) and liquid (l) have no concentration, so these two phases are not involved in the equilibrium constant KC (given the value = 1).

The equilibrium constant based on concentration (Kc) in a reaction

pA + qB -----> mC + nD

[tex]\tt Kc=\dfrac{[C]^m[D]^n}{[A]^p[B]^q}[/tex]

1.   N2(g) + O2(g) ⇌ 2NO(g)

[tex]\tt Kc=\dfrac{[NO]^2}{[N_2][O_2]}[/tex]

2. N2(g) + 3H2(g) ⇌ 2NH3(g)

[tex]\tt Kc=\dfrac{[NH_3]^2}{[N_2][H_2]^3}[/tex]

3. 2SO2(g) + O2(g) ⇌ 3SO3(g)

[tex]\tt Kc=\dfrac{[SO_3]^3}{[SO_2]^2[O_2]}[/tex]

4. 2Fe(S) + 4H2O(g) ⇌Fe3O4(s) +4H2(g)​

[tex]\tt Kc=\dfrac{[H_2]^4}{[H_2O]^4}[/tex]

Answer:

Explanation:

1. It reacts with hydrogen when heated

     Chemical property

2. It is a yellow solid at room temperature

    Physical property

3. It is soluble in carbon disulfide

    Chemical property

4. Its density is 2.97 g/cm3

    Physical property

5. It melts at 113°C

    Physical property

Physical properties tells us everything about what substance is when no change is occurring to its constituents.

It can be observed using apparatus and instruments. Examples are state of matter, color, odor, taste, texture, hardness, solubility in water, density, melting point and boiling point

Chemical properties are those properties that tell us about what a substance can do as regards to whether or not the substance reacts with other substances. Examples are flammability, rusting of irons, precipitation, decomposition of water by an electric current.

Answer:

3.193 mol

Explanation:

The reaction is

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

We use the stoichiometry in order to find the moles of nitrogen required.

[tex]9.58\ \text{mol of }NH_3\times \dfrac{1\ \text{mol of }N_2}{2\ \text{mol of }NH_3}[/tex]

[tex]=3.193\ \text{mol of }N_1[/tex]

The amount of nitrogen required is 3.193 mol to produce 9.58 mol of ammonia.

Answer:

C) the wave is interfered with