4 years ago

Some Reactions are endothermic

Chemistry

1 answer:

Alinara [238K]4 years ago

8 0

Answer:

endothermic means energy is taken in and temperature increases.

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When would a cell use Active Transport? Mark all that apply.

Westkost [7]

Answer:

a c e

Explanation:

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3 years ago

A 4.80g piece of magnesium (Mg) displaces 2.76mL of water when it is placed in a graduated cylinder. What is the density of magn

AnnZ [28]

Answer:

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question we have

$density = \frac{4.80}{2.76} \\ = 1.73913...$

We have the final answer as

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3 years ago

How many moles of CO2 are in 870 mL of a 0.75 M solution?

alukav5142 [94]

Volume in liters:

870 mL / 1000 => 0.87 L

Moles ( CO₂) = molarity x volume

Moles (CO₂) = 0.75 x 0.87

= 0.6525 moles of CO₂

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3 years ago

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6. List the following particles in size order, from<br> biggest to smallest?

Arte-miy333 [17]

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the particles, molecules, and gas range from smallest to largest in the following order: electron < proton < atom <...

5 0

3 years ago

Suppose that you add 26.7 g of an unknown molecular compound to 0.250 kg of benzene, which has a K f of 5.12 oC/m. With the adde

nadya68 [22]

Answer: The molar mass of the unknown compound is 200 g/mol

Explanation:

Depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=2.74^0C$ = Depression in freezing point

i= vant hoff factor = 1 (for molecular compound)

$K_f$ = freezing point constant = $5.12^0C/m$

m= molality

$\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}$

Weight of solvent (benzene)= 0.250 kg

Molar mass of solute = M g/mol

Mass of solute = 26.7 g

$2.74^0C=1\times 5.12\times \frac{26.7g}{Mg/mol\times 0.250kg}$

$M=200g/mol$

Thus the molar mass of the unknown compound is 200 g/mol

4 0

4 years ago