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2 years ago

Question 2 What is 3 x 108 written in standard form?

Chemistry

1 answer:

andriy [413]2 years ago

3 0

I think you meant $3.08*10x^{8}$

If you want to do that then you it will be 308 , 000 , 000

or if you meant 3 x 108 then it would literally just be 3 multiplied by 108 = 324

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A 45.7 block of an unknown metal at 74.2 °C is placed in 72.9 g of water at 15.9 °C. If the

g100num [7]

Answer:

0.934J/g°C

Explanation:

Using Q = mc∆T

However, in this question;

(Q)water = -(Q)metal

(mc∆T)water = -(mc∆T)metal

According to the information provided in the question;

For water;

m = mass = 72.9g

c = specific capacity of water = 4.184 J/g°C

∆T = 22.9 - 15.9 = 7°C

For metal;

m = mass = 45.7g

c = specific capacity of water = ?

∆T = 22.9 - 72.9 = -50°C

(mc∆T)water = -(mc∆T)metal

(72.9 × 4.184 × 7) = -(45.7 × c × -50)

2135.0952 = -(-2285c)

2135.0952 = 2285c

c = 2135.0952/2285

c of metal = 0.934J/g°C

3 0

2 years ago

1. The gases SO2, O2 and SO3 are allowed to reach equilibrium at a constant temperature. The equilibrium constant for the reacti

irina [24]

Answer:

$K_2=1.3x10^{2}atm^{-1/2}$

$PCl_5\rightarrow PCl_3+Cl_2$

$[PCl_5]=0.0375M$

Explanation:

Hello!

a) In this case, since we can see that the second reaction is equal to the half of the first reaction, we can relate the equilibrium constants as shown below:

$K_2=K_1^{1/2}$

Thus, by plugging in the the equilibrium constant of the first reaction we obtain:

$K_2=(1.6x10^4atm^{-1})^{1/2}\\\\K_2=1.3x10^{2}atm^{-1/2}$

b) In this case, for the described reaction we can write:

$PCl_5\rightarrow PCl_3+Cl_2$

Thus, the corresponding equilibrium expression is:

$K=\frac{[PCl_3][Cl_2]}{[PCl_5]}$

In such a way, since we know the equilibrium constant and the concentrations of PCl3 and Cl2 at equilibrium, we can compute the concentration of PCl5 at equilibrium as follows:

$[PCl_5]=\frac{[PCl_3][Cl_2]}{K}\\$

$[PCl_5]=\frac{\frac{0.20mol}{4L} *\frac{0.12mol}{4L} }{0.04}$

$[PCl_5]=0.0375M$

Best regards!

7 0

2 years ago

Which of the following statements is not correct?

Pavlova-9 [17]

Answer: This option is incorrect: <span>B. Covalent compounds are held together by much stronger interparticle forces than are ionic compounds.

Justification:

Ionic bonds, held by ionic compounds, are much stronger than covalent bonds, held by covalent compounds.

In ionic bonds one element yields one or more electrons forming a cation (a positively charged ion) and the other element accepts the electrons forming an anion (a negatively charged ion).

The anion and the cation are electrostatically atracted by each other. This electrostatic atraction force, named ionic bond, is very strong.

As result of this, the ionic compounds form strong crystals with high boiling and fusion points. A good example of this the sodium chloride, formed by the union of cation Na(+) and anion Cl(-).

The covalent bonds are result of sharing electrons and do not form ions. This bond is weaker than the ionic bond.
</span>

4 0

3 years ago

Select the correct answer from each drop-down menu. An atom has 9 electrons and 9 protons at the start. If it loses 2 electrons,

aalyn [17]

Answer:

If it loses to electrons the net charge will be +2. If the atom instead gains 4 electrons, the net charge will be -4.

Explanation: When an atom loses electrons( which are negatively charged), it turns into a cation. This means since there is more protons(which are positively charged) than electrons, the charge is positive. The charge is positive and than the number of electrons lost. It is the exact opposite for gaining electrons.

3 0

3 years ago

H3C6H507 + H2O + H3O+ + H2C6H507<br> acid <br> base

Aleonysh [2.5K]

Explanation:

an acid will give away a proton and become a conjugate base.

A base will accept a proton and become a conjugate acid.

3 0

3 years ago