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2 years ago

HELP HURRY‼️‼️‼️ FAST

Chemistry

2 answers:

lesya692 [45]2 years ago

8 0

I believe the answer is D

barxatty [35]2 years ago

5 0

I think its D is the correct one

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How much heat energy is required to raise the temperature of 15g of silver from 25°C to 55°C, assuming the specific heat of silv

Alenkasestr [34]

Answer:

108 j

Explanation:

.24 j/g-C * 15 g * (55-25) =

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2 years ago

A chemist must dilute of aqueous sodium carbonate solution until the concentration falls to . He'll do this by adding distilled

Mademuasel [1]

The question is incomplete, complete question is :

A chemist must dilute 73.9 mL of 400 mM aqueous sodium carbonate solution until the concentration falls to 125 mM . He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in liters. Be sure your answer has the correct number of significant digits.

Answer:

The final volume of the solution will be 0.236 L.

Explanation:

Concentration of sodium carbonate solution before dilution = $M_1= 400 mM$

Volume of sodium carbonate solution before dilution = $V_1=73.9 mL$

Concentration of sodium carbonate solution after dilution = $M_2= 125 mM$

Volume of sodium carbonate solution after dilution = $V_2=?$

Dilution equation is given by:

$M_1V_1=M_2V_2$

$V_2=\frac{M_1V_1}{M_2}$

$V_2=\frac{400 mM\times 73.9 mL}{125 mM}= 236.48 mL\approx 236 mL$

1 mL = 0.001 L

236 mL = 0.236 L

The final volume of the solution will be 0.236 L.

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3 years ago

True or false: the Molecules in a solid have MORE thermal energy than the molecules in a gas?

katrin2010 [14]

That's false. Because, the molecules in a solid are compacted too tightly together that they don't have all that extra space that a gas would. Molecules in a gas would have more thermal energy because they have all that space to move around in. The more they move around, the hotter it gets. The less that they move around, and the more that they put and packed together, the colder it's going to be.

Hope this helped you!! (:

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2 years ago

Which structural adaptation would help a plant survive better in shady environment ?

kramer

The answer is large leaves.

These enable the plant to absorb more of the scarce sunlight it receives, so it can create enough nutrients for it to survive.

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3 years ago

A block of wood has a volume of 55 cm3 and a mass of 550 g. What would be its density? Answer in units of g/cm3.

VLD [36.1K]

given,

volume (V)=55cm3

mass(m)=550g

now density=m/v

=550/55

=10 g/ cm3

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3 years ago