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2 years ago

The graph shows a sample of gas when it is hot, cold, and at room temperature.

Chemistry

1 answer:

AveGali [126]2 years ago

3 0

Answer:

B represents gas at room temperature and C represents hot gas.

Explanation:

As the temperature increases, the no. of particles that has higher energy increases.

So, A represents the cold gas, because it has the lowest no. of particles that has high energy.

B represents the gas at room T because it has more no. of particles with higher energy.

C represents the hot gas, because it is the curve that has the highest no. of particles with high energy.

So, the right choice is:

B represents gas at room temperature and C represents hot gas.

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The ph of a solution that contains 0.818 m acetic acid (ka = 1.76 x 10-5) and 0.172 m sodium acetate is __________.

crimeas [40]

PH is calculated using Handerson- Hasselbalch equation,

pH = pKa + log [conjugate base] / [acid]

Conjugate Base = Acetate (CH₃COO⁻)
Acid = Acetic acid (CH₃COOH)
So,
pH = pKa + log [acetate] / [acetic acid]

We are having conc. of acid and acetate but missing with pKa,
pKa is calculated as,

pKa = -log Ka
Putting value of Ka,
pKa = -log 1.76 × 10⁻⁵

pKa = 4.75
Now,
Putting all values in eq. 1,

pH = 4.75 + log [0.172] / [0.818]

pH = 4.072

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2 years ago

Which of the following is the best definition of pseudoscience?

expeople1 [14]

The definition of pseudoscience is collection of beliefs or practices mistakenly regarded as being based on scientific method. which B is very similar to that. I believe the answer is A.

Have a nice day.

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2 years ago

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The process of joining many small molecules into larger molecules is called(1) neutralization (3) saponification(2) polymerizati

yulyashka [42]

(2) polymerization. polymerization is a process of reacting monomer molecules together in a chemical reaction to form polymer chains or three-dimensional networks.

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When 50 ml (50 g) of 1.00 m hcl at 22oc is added to 50 ml (50 g) of 1.00 m naoh at 22oc in a coffee cup calorimeter, the tempera

vitfil [10]

Answer:

$\boxed{\text{2700 J}}$

Explanation:

HCl + NaOH ⟶ NaCl + H₂O

There are two energy flows in this reaction.

Heat of reaction + heat to warm water = 0

q₁ + q₂ = 0

q₁ + mCΔT = 0

Data:

m(HCl) = 50 g

m(NaOH) = 50 g

T₁ = 22 °C

T₂ = 28.87 °C

C = 4.18 J·°C⁻¹g⁻¹

Calculations:

m = 50 + 50 = 100 g

ΔT = 28.87 – 22 = 6.9 °C

q₂ = 100 × 4.18 × 6.9 = 2900 J

q₁ + 2900 = 0

q₁ = -2900 J

The negative sign tells us that the reaction produced heat.

The reaction produced $\boxed{\textbf{2900 J}}$ .

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2 years ago

How many grams o an ointment base must be added to 45 g o clobetasol (T EMOVAT E) ointment, 0.05% w/w, to change its strength to

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Answer:

Drug calculation

If we have 45g of clobetasol = 0.05%w/w

Then what mass in g of clobetasol is in 0.03%w/w = 45 x 0.03/0.05 =27g

It means that 27g of clobetasol must be added to change the drug strength to 0.03% w/w

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2 years ago