Help me with this science question on the middle one..

Answer:

5. The coefficients are: 2, 7, 2, 4

6. The coefficients are: 1, 4, 1, 2

Explanation:

5. Balancing the equation.

__NO₂ + __H₂ —> __NH₃ + __H₂O

The above equation can be balance as illustrated below:

NO₂ + H₂ —> NH₃ + H₂O

There are 2 atoms of O on the left side and 1 atom on the right side. It can be balance by writing 2 before NO₂ and 4 before H₂O as shown below:

2NO₂ + H₂ —> NH₃ + 4H₂O

There are 2 atoms of N on the left side and 1 atom on the right side. It can be balance by writing 2 before NH₃ as shown below:

2NO₂ + H₂ —> 2NH₃ + 4H₂O

There are 2 atoms of H on the left side and a total of 14 atoms on the right side. It can be balance by writing 7 before H₂ as shown below:

2NO₂ + 7H₂ —> 2NH₃ + 4H₂O

Now the equation is balanced. Thus, the coefficients are: 2, 7, 2, 4

6. Balancing the equation:

__SiO₂ + __HF —> __SiF₄ + __H₂O

The above equation can be balance as illustrated below:

SiO₂ + HF —> SiF₄ + H₂O

There are 4 atoms of F on the right side and 1 atom on the left side. It can be balance by writing 4 before HF as shown below:

SiO₂ + 4HF —> SiF₄ + H₂O

There are 4 atoms of H on the left side and 2 atoms on the right side. It can be balance by writing 2 before H₂O as shown below:

SiO₂ + 4HF —> SiF₄ + 2H₂O

Now the equation is balanced. Thus, the coefficients are: 1, 4, 1, 2

Answer:

When an ionic crystal breaks, it tends to do so along smooth planes because ... ions are forced near each other and the repulsive force causes the crystal to shatter. ... Cations move to one electrode, while anions move to the other, ... Diagram of ions in an ionic solution when an electrical current is applied.

Explanation:

Hope this helped

Molar Mass of Al = 27

Molar Mass of S = 32

Molar Mass of O = 16

Putting the molar mass value in Al2 (SO4) 3

27 x 2 + 3 ( 32 + 16 x 4)

54 + 3 ( 32+ 64)

54 + 3 x 96

54 + 288

342

Answer:

26.85 grams

Explanation:

The formula for mole calculations is number of moles = given mass/gram-formula mass.

The number of moles is given to us, which is 0.125.

The gram formula mass of SnSO4 is about 214.77.

Plug in the values we have into the equation. It should look like this:

0.125 = x / 214.77

Solve for x by multiplying 214.77 and 0.125. The answer should be about 26.85 grams.

Answer:

C. Gravity only

Explanation:

Answer:

[tex]C_3H_6[/tex]

Explanation:

¡Hola!

En este caso, basado en la información dada, es posible calcular las moles de carbono en el compuesto al usar la masa molar del CO2 y la siguiente relación molar:

[tex]n_C=0.660gCO_2*\frac{1molCO_2}{44.01gCO_2}*\frac{1molC}{1molCO_2}=0.015molC[/tex]

Ahora, calculamos las moles de hidrógeno restando la masa de carbono de la de la muestra basado en el siguiente factor molar:

[tex]m_{H}=0.210g-0.015molC*12.01gC/molC=0.030molH[/tex]

Entonces la formula empírica del compuesto resulta:

[tex]CH_2[/tex]

Dado que el carbono y el hidrógeno están en una relación 1:2. Ahora bien, calculamos la masa molar del gas considerando la presión, densidad y temperatura del mismo:

[tex]PV=nRT\\\\PV=\frac{m}{MM}RT \\\\MM=\frac{m}{V}\frac{RT}{P}=\frac{dRT}{P}\\\\MM=\frac{1.87g/dm^3*0.08206\frac{atm*L}{mol*K}*273K}{1atm}=41.9g/mol[/tex]

Es decir que la fórmula molecular y la empírica están en una relación de 3, por lo que la fórmula molecular resulta:

[tex]C_3H_6[/tex]

¡Saludos!

Answer:

2SO2 + O2 → 2SO3

Explanation:

According to this question, sulphur dioxide (SO2) reacts with oxygen to produce sulphur trioxide (SO3). The equation is as follows:

SO2 + O2 → SO3

The above equation is unbalanced because there are unequal number of atoms of each element in the both reactants and products. To balance the equation, we use coefficients to make the number of atoms equal. The balanced equation is as follows:

2SO2 + O2 → 2SO3

- There are 2 moles of S on both sides of the equation.

- There are 4 moles of Oxygen on both sides of the equation.

Answer:

1) b. 4.38

2)  d. 10.7

Explanation:

1) The problem tells us that [H₃O⁺] = 4.2x10⁻⁵ M, and keeping in mind that [H₃O⁺]= [H⁺], we can calculate the pH of the solution:

2) First we calculate the pOH of the solution:

Then we calculate the pH using the following formula:

The pH of a solution with a concentration of 4.2x10⁻⁵ M H₃O⁺ ion is 4.38 and of a solution with a concentration of 4.6x10⁻⁴ OH⁻ ion is 10.7.

pH of any solution is define as the negative log of the concentration of H⁺ ions and pOH is define as the negative log of the concentration of OH⁻ ions.

Given that concentration of H⁺ ions in solution = 4.2x10⁻⁵ M

pH for this solution is calculated as:
pH = -log(4.2x10⁻⁵) = 4.38

Also given that concentration of OH⁻ ions in solution = 4.6x10⁻⁴

pOH = -log(4.6x10⁻⁴) = 3.33

We know that, pH + pOH = 14.

pH = 14 - 3.33 = 10.7

Hence, value of pH & pOH is 4.38 and 10.7 respectively.

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Answer:

2

Explanation:

Answer:

I think they have high, because the nonpolar molecules usually have a much lower surface tension than polar ones.

Answer:

A

Explanation:

The cells split up into two to repair the damaged cell

Answer:

When heated, oxygen reacts with copper to form copper oxide. If this reaction occurs in a sealed container, will the mass of the container and everything in it increase, decrease, or stay the same and why? The mass will increase because a new kind of molecule is formed.

Explanation:

As above, carbonates decompose upon heating to give the metal oxide and carbon dioxide. The mass is lost as carbon dioxide.

To solve this we must be knowing each and every concept related to mass. Therefore, Carbon dioxide is released as the mass is depleted when carbonates are heated.

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes.

When copper was heated in the air, the resulting solid product has a larger mass than the initial copper. When calcium carbonate was heated in air, the resulting solid product has much less mass than the initial calcium carbonate. When carbonates are heated, they breakdown into metal oxides and carbon dioxide. Carbon dioxide is released as the mass is depleted.

Therefore, Carbon dioxide is released as the mass is depleted.

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Answer:

C

Explanation:

d=300

t=6hr

speed=?

speed=300/6

speed=50m/hr the important thing in this question is to get the right units

Answer:

However, when she looks at a sample using a magnifying lens, she can see small droplets of liquid surrounded by another liquid. Which conclusion best fits her observations? The mixture is a solution because it has the same appearance throughout the sample

pls mark me the brainliest

Answer:

well a 1000

Explanation:

The addition of any non-volatile solutes will elevate the boiling point of the solution. The change in boiling point of water by the addition of 2.10 of barium chloride is 0.0028 ° C. Hence, option A is correct.

Boiling point of a substance is the temperature at which it changes from liquid to vapour where the two states are in equilibrium. Boiling point of a substance depends on the bond type, molecular mass and purity of it.

The change or elevation of boiling point of a solution can be determined from its molality m and elevation constant Kb and the Van't Hoff factor i as follows:

ΔT = i Kb m.

Molality of the solution is the no.of moles divided by the mass of solvent in kilogram. Given the mass of barium chloride is 2.10 g and its molar mass is 208.23 g . The no.of moles of solute is 2.10/208.23 g = 0.0100.

Molality of the solution can be calculated as follows:

Molality m = 0.0100 / 5.50 Kg

                 = 0.0018 mol/kg.

Now, the  ΔT s calculated from these values. Provided Kb of water is 0.51 ° C /mol and i = 3.

ΔT  = 0.0018 mol/kg × 0.51 × 3

       = 0.0028 ° C.

Therefore, water will boil at 100.0028 ° C. Hence, option A is correct.

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Answer:

The digestive system is very important to animal health. Without the digestive system earth might still be lifeless other than bacteria and what not. The digestive system is a system to keep us full and energized. It allows us to chew and swallow our food and let it break down in our belly acid. Then it departs our body through the large, small intestines to then be flushed out to sea.

~ LadyBrain

Explanation:

an organ that is part of the

digestive system his digestive system is extremely simple

bez number of particles in reaction increases so randomness or entropy increase.

as entropy is the degree of randomness of particles in a system

➡ ANSWER

☑ C. 3.5 105 Hz

Answer:

Incorrect

Explanation:

X is the reactants

Y is the products

In an endothermic reaction where energy is absorbed, the enthalpy the products (Y) is always higher than the enthalpy of the reactants (X).

Enthalpy change (∆H) = products (Y) - Reactants (X)

For an endothermic reaction, the ∆H value should be positive.

Enthalpy change

The diagram sketched by the students shows the opposite. The diagram shows that the enthalpy of the products (Y) is lower than the enthalpy of the reactants (X). This will give a negative value of ∆H.

It represents an exothermic reaction rather than endothermic.

Therefore, the student is incorrect.

Answer:

c

Explanation:

Answer:

D. The energy in light waves comes in units called photons.

Explanation:

its known as quatum theory

Answer:

Electrons are lost during oxidation (LEO)

Answer:

A.) is the correct answer

The continuation of the electronic configuration would be 3p6, 4s2, 3d4

The initial p-orbital (the 3p3) is incompletely filled. Thus, the first thing would be to fill it completely (3p6) so as to obey the orbital-filling rule. This leaves 6 more electrons

After 3p orbital, the next orbitals are 4s, 3d, 4p, 5s, etc.

The 4s orbital will take a maximum of 2 electrons, leaving 4 more electrons.

Next would be the 3d orbital which can take a maximum of 8 electrons, but only 4 electrons are left.

Thus, the electronic configuration would be 3p6, 4s2, 3d4.

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Answer:

sry I don't know much about chemistry

s2,p6,d10,f14

S contains 2 orbitals

P contains 6 orbitals

D contains 10 orbitals

F contains 14 orbitals

Answer:

Explanation:

A reaction rate is the measure of the change in concentration of the disappearance of reactants or the change in concentration of the appearance of products per unit time