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3 years ago

Multiple choices

Chemistry

1 answer:

Vadim26 [7]3 years ago

5 0

Answer:

B, C, & E

Explanation:

Fission reaction involves the splitting of heavy unstable atoms into stable lighter atoms, with the release of energy. Fission energy is advantageous in that it produces a huge amount of energy per mass compared to other energy sources (hence also used to make nuclear bombs). However, fission produces radioactive waste particles, such as beta and alpha particles, that have high ionizing energy and can be harmful to living things.

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A 36 gram sample contains 28 grams of fe and 8 grams of oxygen. determine the percent composition for each of the elements.

ankoles [38]

The sample contains both Fe and oxygen

The mass of the sample is 36 g

28 g are Fe and 8 g are O

So to find the percent composition we can calculate using the following formula

Percent composition of the element = mass of the element / mass of the sample x 100%

Percent composition of Fe = 28 g / 36 g x 100 % = 77.8%

Percent composition of O = 8 g / 36 g x 100 % = 22.2%

4 0

3 years ago

Read 2 more answers

A 44 L cylinder containing helium gas at a pressure of 43.1 atm is used to fill a weather balloon in order to lift equipment int

Hoochie [10]

Answer:

The value of maximum pressure the balloon could be filled = 6.40 atmosphere.

Explanation:

When helium from the cylinder is filled inside the balloon the heat & work

transfer is zero during the process. so from the first law of thermodynamics

change in internal energy is zero.

⇒ $U_{2} - U_{1}$ = 0

⇒ $U_{2}$ = $U_{1}$

⇒ $T_{2}$ = $T_{1}$ ------------- (1)

Final temperature is equal to initial temperature.

Equation (1) can be written as

⇒ $P_{2}V_{2}$ = $P_{1}V_{1}$ -------------(2)

Initial volume = 44 L

Final volume = 296 L

Initial pressure = 43.1 atmosphere

Final pressure = we have to calculate

Put all the values in Equation (2) we get,

⇒ $P_{2}$ × 296 = 43.1 × 44

⇒ $P_{2}$ = 6.40 atmosphere

This is the value of maximum pressure the balloon could be filled.

6 0

4 years ago

Explain why the water in a pool does not get as hot as the wood deck surrounding the pool.

____ [38]

Explanation:

this is because water cools down heat

5 0

3 years ago

What is the percent hydrogen in ammonium sulfide

sertanlavr [38]

There is no hydrogen in ammonium sulfide it is just 1 ammonium and 1 sulfer

8 0

3 years ago

2) Show the calculation of Kc for the following reaction if an initial reaction mixture of 0.800 mole of CO and 2.40 mole of H2

nadezda [96]

Answer:

Kc = 3.90

Explanation:

CO reacts with $H_2$ to form $CH_4$ and $H_2O$ . balanced reaction is:

$CO(g) + 3H_2 (g) \leftrightharpoons CH_4(g) + H_2O(g)$

No. of moles of CO = 0.800 mol

No. of moles of $H_2$ = 2.40 mol

Volume = 8.00 L

Concentration = $\frac{Moles}{Volume\ in\ L}$

Concentration of CO = $\frac{0.800}{8.00} = 0.100\ mol/L$

Concentration of $H_2$ = $\frac{2.40}{8.00} = 0.300\ mol/L$

$CO(g) + 3H_2 (g) \leftrightharpoons CH_4(g) + H_2O(g)$

Initial 0.100 0.300 0 0

equi. 0.100 -x 0.300 - 3x x x

It is given that,

at equilibrium $H_2O (x)$ = 0.309/8.00 = 0.0386 M

So, at equilibrium CO = 0.100 - 0.0386 = 0.0614 M

At equilibrium $H_2$ = 0.300 - 0.0386 × 3 = 0.184 M

At equilibrium $CH_4$ = 0.0386 M

$Kc=\frac{[H_2O][CH_4]}{[CO][H_2]^3}$

$Kc=\frac{0.0386 \times 0.0386}{(0.184)^3 \times 0.0614} =3.90$

8 0

4 years ago