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3 years ago

Hydrogen has three isotopes 1H, 2H, and 3H. What is the difference between these three isotopes?

1 answer:

4 0

The main difference between the 3 isotopes of hydrogen are the number of neutrons in the nucleus. Hydrogen has no neutrons, Deuterium has one neutron, and tritium has two neutrons. All three have one proton and one electron.

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A girl has a weight of 450 N and her feet have a total area of 300Cm2

snow_tiger [21]

Answer:

15000N/m²

Explanation:

Given parameters:

Force exerted by the girl = 450N

Area = 300cm²

Unknown:

Pressure exerted by her feet =?

Solution:

Pressure is the force per unit area on a body;

Pressure = $\frac{force }{area}$

We need to convert the given area to m²;

10000cm² = 1m²

300cm² = $\frac{300}{10000}$ = 0.03m²

Pressure = $\frac{450}{0.03}$ = 15000N/m²

8 0

3 years ago

Harry has dark hair like his father, but his mom has red hair. Using the genotypes of rr (red hair), Rr (dark/brown hair), RR (

Nastasia [14]

Is there answers to go along with this? it should be Dark/Brown hair

7 0

3 years ago

Read 2 more answers

The domain level divides

White raven [17]

Answer:

B. Prokaryotes do NOT have a nucleus.

7 0

3 years ago

What is work and state the law of conservation mass?

Butoxors [25]

Answer:

Work is a force causing the movement or displacement of an object

law of conservation mass:

1. Atoms cannot be created or destroyed in a chemical reaction.

2. Molecules cannot be created or destroyed in a chemical reaction.

3. Compounds cannot be created or destroyed in a chemical reaction.

4. Heat cannot be created or destroyed in a chemical reaction.

7 0

3 years ago

Water has a boiling point of 100.0°C and a Kb of 0.512°C/m. What is the boiling

Reil [10]

Answer:

The boiling point of a 8.5 m solution of Mg3(PO4)2 in water is 394.91 K.

Explanation:

The formula for molal boiling Point elevation is :

$\Delta T_{b} = iK_{b}m$

$\Delta T_{b}$ = elevation in boiling Point

$K_{b}$ = Boiling point constant( ebullioscopic constant)

m = molality of the solution

i = Van't Hoff Factor

Van't Hoff Factor = It takes into accounts,The abnormal values of Temperature change due to association and dissociation .

In solution Mg3(PO4)2 dissociates as follow :

$Mg_{3}(PO_{4})_{2}\rightarrow 3Mg^{2+} + 2 PO_{4}^{3-}$

Total ions after dissociation in solution :

= 3 ions of Mg + 2 ions of phosphate

Total ions = 5

i = Van't Hoff Factor = 5

m = 8.5 m

$K_{b}$ = 0.512 °C/m

Insert the values and calculate temperature change:

$\Delta T_{b} = iK_{b}m$

$\Delta T_{b} = 5\times 0.512\times 8.5$

$\Delta T_{b} = 21.76 K$

Boiling point of pure water = 100°C = 273.15 +100 = 373.15 K

$\Delta T_{b} = T_{b} - T_{b}_{pure}$

$T_{b}_{pure}$ = 373.15 K[/tex]

21.76 = T - 373.15

T = 373.15 + 21.76

T =394.91 K

8 0

3 years ago