All categories

2 years ago

How is heat transferred when a person holds an ice pack?

Chemistry

1 answer:

Darina [25.2K]2 years ago

8 0

I’m pretty sure it’s b.

You might be interested in

Which of the following examples is a molecule with a covalent bond?

serious [3.7K]

Answer:

B. CO

Explanation:

4 0

2 years ago

A sample of gas is observed to effuse through a pourous barrier in 4.98 minutes. Under the same conditions, the same number of m

kogti [31]

Answer:

The molar mass of the unknown gas is $\mathbf{ 51.865 \ g/mol}$

Explanation:

Let assume that the gas is O2 gas

O2 gas is to effuse through a porous barrier in time t₁ = 4.98 minutes.

Under the same conditions;

the same number of moles of an unknown gas requires time t₂ = 6.34 minutes to effuse through the same barrier.

From Graham's Law of Diffusion;

Graham's Law of Diffusion states that, at a constant temperature and pressure; the rate of diffusion of a gas is inversely proportional to the square root of its density.

i.e

$R \ \alpha \ \dfrac{1}{\sqrt{d}}$

$R = \dfrac{k}{d}$ where K = constant

If we compare the rate o diffusion of two gases;

$\dfrac{R_1}{R_2}= {\sqrt{\dfrac{d_2}{d_1}}$

Since the density of a gas d is proportional to its relative molecular mass M. Then;

$\dfrac{R_1}{R_2}= {\sqrt{\dfrac{M_2}{M_1}}$

Rate is the reciprocal of time ; i.e

$R = \dfrac{1}{t}$

Thus; replacing the value of R into the above previous equation;we have:

$\dfrac{R_1}{R_2}={\dfrac{t_2}{t_1}}$

We can equally say:

${\dfrac{t_2}{t_1}}= {\sqrt{\dfrac{M_2}{M_1}}$

${\dfrac{6.34}{4.98}}= {\sqrt{\dfrac{M_2}{32}}$

$M_2 = 32 \times ( \dfrac{6.34}{4.98})^2$

$M_2 = 32 \times ( 1.273092369)^2$

$M_2 = 32 \times 1.62076418$

$\mathbf{M_2 = 51.865 \ g/mol}$

7 0

2 years ago

Write a balanced chemical equation for the standard formation reaction of gaseous dinitrogen tetroxide n2o4 .

eduard

<span>Answer: 3 N2H4 (l) = 4 NH3 (g)+ N2 (g) 2 N2H4 (l) + N2O4 (g) =3 N2 (g)+ 4 H2O (g)</span>

3 0

2 years ago

Read 2 more answers

The nucleus of an atom consists of:

ArbitrLikvidat [17]

Answer:

the nucleus of an atom consistens of protons and neutrons

7 0

3 years ago

What is BHC in benzene?

dezoksy [38]

Answer:

Benzene Hexachloride

Explanation:

BHC in benzene mean ''Benzene Hexachloride''.

<h2>B = Benzene</h2><h2>H + C = Hexachloride </h2>

As you can see, There are only two words and three letters. Even though it is one word, Hexa = H and Chloride = C

4 0

3 years ago