All categories

3 years ago

Can I get some help

Chemistry

1 answer:

rosijanka [135]3 years ago

6 0

Energy cannot be created or destroyed in chemical reactions. All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Endothermic reactions absorb energy, and exothermic reactions release energy

You might be interested in

Review the poster.

nataly862011 [7]

Please mark Brainliest!!! have a good day/night!

3 0

3 years ago

Read 2 more answers

1.24 grams of magnesium phosphate tribasic dissolved in 1 L of lemon juice. What is the Ksp of the magnesium phosphate tribasic

vivado [14]

<u>Answer:</u> The solubility product of magnesium phosphate tribasic is $2.52\times 10^{-10}$

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution (in L)}}$

Given mass of magnesium phosphate = 1.24 g

Molar mass of magnesium phosphate = 262.85 g/mol

Volume of solution = 1 L

Putting values in above equation, we get:

$\text{Molarity of solution}=\frac{1.24g}{262.85g/mol\times 1}\\\\\text{Molarity of solution}=4.72\times 10^{-3}M$

The equation for the ionization of the magnesium phosphate is given as:

$Mg_3(PO_4)_2\leftrightharpoons 3Mg^{2+}+2PO_4^{3-}$

Expression for the solubility product of $Mg_3(PO_4)_2$ will be:

$K_{sp}=[Mg^{2+}]^3[PO_4^{3-}]^2$

We are given:

$[Mg^{2+}]=(3\times 4.72\times 10^{-3})=1.416\times 10^{-2}M$

$[PO_4^{3-}]=(2\times 4.72\times 10^{-3})=9.44\times 10^{-3}M$

Putting values in above expression, we get:

$K_{sp}=(1.416\times 10^{-2})^3\times (9.44\times 10^{-3})^2=2.52\times 10^{-10}$

Hence, the solubility product of magnesium phosphate tribasic is $2.52\times 10^{-10}$

4 0

3 years ago

Using the diagram above, answer the following questions:

STatiana [176]

Answer:

See explanation for details

Explanation:

6) C is false. What is going on there is actually a transformation of mechanical energy to the chemical energy stored in carbon dioxide in the atmosphere. The burning of the fossil fuel produces mechanical energy which is stored in the chemical bonds of CO2 hence the statement is false

7) A is true. Solar energy refers to energy from the sun, this energy is trapped from Tue sun and stored in chemical bonds in glucose, and starch molecules during photosynthesis.

8) C represents the release of carbon dioxide by the burning of fossil fuels.

9) B,C,D, E

B refers to photosynthesis in which plants take in atmospheric carbon dioxide

C refers to the burning of fossil rules which releases atmospheric carbon dioxide

D refers to the dissolution of atmospheric carbon dioxide in water bodies to form carbonates in water.

E refers refers the return of organic carbon to the soil by dead organisms

10) A and C

A shows the conversion of solar energy to chemical energy

C shows the conversion of mechanical energy to chemical energy

7 0

3 years ago

We have 548 grams of CaCl2. How many molecules of CaCl2 do we have? (The molar mass of CaCl2 is 110.98 g/mol)

nekit [7.7K]

Answer:

Try everything

2.97 x 10^24 molecules

3.66 x 10^28 molecules

9.1 x 10^22 molecules

4.37 x 10^22 molecules

Explanation:

3 0

3 years ago

as a gas occupied a volume of 250cc at 250at 700mm pressure temperature,25degree Celsius what additional pressure is required?re

Allisa [31]

Additional pressure required : 175 mm

<h3>Further explanation</h3>

Boyle's Law

At a constant temperature, the gas volume is inversely proportional to the pressure applied

$\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}$

V₁=250 ml

P₁=700 mmHg

$\tt V_2=\dfrac{4}{5}\times 250=200~ml$

$\tt P_2=\dfrac{P_1.V_1}{V_2}\\\\P_2=\dfrac{700\times 250}{200}=875~mmHg$

Additional pressure :

$\tt 875-700=175~mm$

4 0

3 years ago