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3 years ago

I NEED HELP PLEASE, THANKS!

Chemistry

1 answer:

baherus [9]3 years ago

3 0

Answer:

Solids have a definite shape and volume. Liquids have a definite volume, but take the shape of the container. Gases have no definite shape or volume.

Explanation:

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Question 2 (1 point)

babunello [35]

Answer:

o and cl

Explanation:

metals and nonmetals tend to form ionic bonds

7 0

3 years ago

Which statement is TRUE? A. Energy can be created or destroyed. B. Electrical energy is created from other forms of energy. C. E

Lana71 [14]

The answer is D. The energy can not be created or destroyed. It can only be transformed from one form to another. This is called the law of conservation of energy. So the word "make" and "create" is not correct.

8 0

3 years ago

Read 2 more answers

After creating a Beer's Law plot using standard solutions of Q, you determined the slope of Beer's Law to be 0.598 M-1. Your unk

Mashutka [201]

Answer:

$C=0.247~M$

Explanation:

We have to start this question with Beer's Law, $A=E*b*C*$ . On this equation we will have:

A=Absorbance

E=Molar absorption coefficient

b= Optical path

C=Concentration

So, the question is: what values of this equation we know?. If we check the question we have the absorbance value "0.148" additionally we have the slope of the plot, this slope is the molar absorption coefficient, therefore E=0.598 M-1, finally we have also the optical path. The optical path is 1 cm for all devices, so b=1 cm. With all these values we can calculate the concentration "C".

$C=\frac{A}{b*E}$

$C=\frac{0.148}{1*0.598}$

$C=0.247~M$

So, we will have a concentration of 0.247 M

I hope it helps!

4 0

3 years ago

10 points Which of these is the best example of heat transfer by radiation? *

insens350 [35]

Answer:

a) A satellite is warmed by sunlight.

Explanation:

Heat transfer by radiation mostly involves heat gain or heat loss from the Sun. In this case, Option A is the only option where sunlight is involved so it is the best example of heat transfer by radiation.

3 0

3 years ago

If a 275 mL gas container had pressure of 732.6 mm Hg at -28°C and the gas was condensed into a liquid with a mass of 1.95 g, wh

ipn [44]

Answer:

THE MOLAR MASS OF THE GAS IS 147.78 G/MOLE

Explanation:

Using PV = nRT

n = Mass / molar mass

P = 732.6 mmHg = 1 atm = 760 mmHg

So therefore 732.6 mmHg will be equal to 732.6 / 760 = 0.964 atm

P = 0.964 atm

V = 275 mL = 275 *10 ^-3 L

R = 0.082 Latm/ mol K

T = -28 C = 273 - 28 K = 245 K

mass = 1.95 g

molar mass = unknown

Having known the other variables in the formula, the molar mass of the gas can be obtained.

PV = m R T/ molar mass

Molar mass = m RT / PV

Molar mass = 1.95 * 0.082 * 245 / 0.964 * 275 *10^-3

Molar mass = 39.1755 / 265.1 *10^-3

Molar mass = 39.1755 / 0.2651

Molar mass = 147.78 g/mol

The molar mass of the gas is 147.78 g/mol

5 0

4 years ago