All categories

3 years ago

I NEED HELP PLEASE, THANKS! :)

Chemistry

1 answer:

Elan Coil [88]3 years ago

6 0

Answer:

Hi there!

Based on my own words, the electron cloud is a shell surrounding the nucleus that only consists of electrons.

You might be interested in

All forms of energy can be converted into any other form. TrueFalse

belka [17]

True.

No matter what, the energy given by a substance can act as energy for something else. For example, the energy exerted by wind can be used to power a windmill, which in turn can power a generator that creates electricity. Another example can be running water, which generates energy that is used to turn a water turbine, which then generates electricity from the energy that is passing through the turbine.

6 0

2 years ago

Read 2 more answers

A steady-state plasma concentration of 25 mg/L v by IV infusion to healthy volunteers (average weight, 75 kg) at a rate of 7.5 m

Aleks [24]

Answer:

The correct answer is option B.

Explanation:

Concentration of a steady-state plasma ,= 25 mg/L

Weight of the volunteer =75 kg

Rate of infusion = 7.5 mg/kg hr

Concentration of steady-state plasma in 75 kg weight body:

$7.5 mg/kg hr\times 75 kg=562.5 mg/hr$

Total body clearance of this drug:

$\frac{562.5 mg/hr}{25 mg/L}=22.5 L/hr$

The total body clearance of this drug is 22.5 L/hr.

8 0

2 years ago

The __ describes the steps you use during an experiment?

olasank [31]

I think the word your looking for is procedure

3 0

3 years ago

You put to chemicals in a bottle and screw on the lid.when you shake in the bottle starts to warm up what kind of reaction is th

Igoryamba

That experiment it's called a MRE bomb. That's why when you add the water to the chemicals in the bottle, it heats up causing the gasses to expand and then the bottle explodes. (It is a very dangerous experiment)

Hope I helped!

- Amber

3 0

2 years ago

If 0.896 g of a gas occupies a 250 mL flask at 20°C and 760 mm Hg of pressure, what is the molar mass of the gas?

salantis [7]

Answer:

86.2 g/mol

Explanation:

Before you can find the molar mass, you first need to calculate the number of moles of the gas. To find this value, you need to use the Ideal Gas Law:

PV = nRT

In this equation,

-----> P = pressure (mmHg)

-----> V = volume (L)

-----> n = moles

-----> R = Ideal Gas constant (62.36 L*mmHg/mol*K)

-----> T = temperature (K)

After you convert the volume from mL to L and the temperature from Celsius to Kelvin, you can use the equation to find the moles.

P = 760 mmHg R = 62.36 L*mmHg/mol*K

V = 250 mL / 1,000 = 0.250 L T = 20 °C + 273.15 = 293.15 K

n = ? moles

PV = nRT

(760 mmHg)(0.250 L) = n(62.36 L*mmHg/mol*K)(293.15 K)

190 = n(18280.834)

0.0104 = n

The molar mass represents the mass (g) of the gas per every 1 mole. Since you have been given a mass and mole value, you can set up a proportion to determine the molar mass.

$\frac{?grams}{1 mole} =\frac{0.896grams}{0.0104moles}$ <----- Proportion

$?grams(0.0104moles) = 0.896$ <----- Cross-multiply

$?grams = 86.2$ <----- Divide both sides by 0.0104

8 0

1 year ago