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Simora [160]
4 years ago
6

Which has more mechanical energy, a box on the top shelf of a closet or a box of equal mass on the floor? The box on the floor h

as more mechanical energy because work has been done on it. The box on the shelf has more mechanical energy because it is higher above Earth's surface. They have the same mechanical energy. There is not enough information to know.
Chemistry
2 answers:
denis-greek [22]4 years ago
8 0

the box on the shelf is right:)

Ksju [112]4 years ago
4 0

Answer: B: The box on the shelf has more mechanical energy because it is higher above Earth's surface.

Explanation:

cause its right :)

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If a solution containing 45.101 g of mercury(II) acetate is allowed to react completely with a solution containing 12.026 g of s
AnnyKZ [126]

Answer:

14.533 grams of solid precipitate of mercury(II) dichromate will form.

Explanation:

Hg(CH_3COO)_2(aq)+Na_2Cr_2O_7(aq)\rightarrow HgCr_2O_7(s)+2CH_3COONa(aq)

Moles of mercury(II) acetate = \frac{45.101 g}{318.70 g/mol}=0.14152 mol

Moles of sodium dichromate = \frac{12.026 g}{261.97 g/mol}=0.045906 mol

According to reaction , 1 mole of sodium dichromate reacts with 1 mole of mercury(II) acetate , then 0.045906 moles of sodium dichromate will recat with :

\frac{1}{1}\times 0.045906 mol=0.045906 mol of mercury(II) acetate

This means that mercury(II) acetate is present in an excess amount and sodium dichromate is present in limiting amount.So, amount of precipitate will depend upon moles of sodium dichromate.

According to reaction , 1 mole of sodium dichromate gives 1 mole of mercury(II) dichromate , then 0.045906 moles of sodium dichromate will give :

\frac{1}{1}\times 0.045906 mol=0.045906 mol of mercury(II) dichromate

Mass of 0.045906 moles of mercury(II) dichromate:

0.045906 mol × 316.59 g/mol = 14.533 g

14.533 grams of solid precipitate of mercury(II) dichromate will form.

3 0
4 years ago
Rank these atoms and ions according to radius. K-, K+, K
11Alexandr11 [23.1K]
K-, K, K+ (biggest to smallest) 
3 0
3 years ago
An unknown mass of aluminum requires 6290 joules to raise
Alex Ar [27]

Answer:

124.579 g

Explanation:

Amount of heat required to change the temperature of body is given by the equation given below

Q = m* c * ΔT ____________________equation A

where Q is the total heat energy required by the any object

c is the specific heat capacity of the body J/gK

ΔT is the difference of final temperature of the object and initial temperature of the object

______________________________________

Given Q = 6290 joules

c = 0.900 J/gK

To calculate the temperature in kelvin from Celsius

we can use the formula

K = C + 273

initial temperature  = 23.9°C

initial temperature on kelvin scale =  23.9° + 273 = 296.9

Final temperature  = 80°C

initial temperature on kelvin scale =  80° + 273 = 353

ΔT(temperature difference) = 353 - 296.9 = 56.1

___________________________________________

let the mass of of the  aluminum be m g

substituting the value of Q , c, ΔT in equation A we have

Q = m* c * ΔT

=> 6290 = m * 0.900 * 56.1

=> m = 6290/(0.900 * 56.1 )

=> m = 6290/50.49

=> m = 124.579 g

The mass of the  aluminum is 124.579 g

8 0
3 years ago
Acidic water can react with limestone to break the rock down and form caves in the Earth's surface. This is an example of ______
blagie [28]

Answer:

Filling in the blank, this is an example of <u>chemical weathering</u> which happens <u>to rocks</u> overtime.

Explanation:

Chemical weathering occurs when rocks are disintegrated by chemicals.

Rain water becomes acid rain when it reacts with carbon dioxide in the atmosphere (to form carbonic acid, HCO3).

When acidic rainwater falls and stays on rocks, chemical reactions take place with the minerals present in the rock, causing the rock to weather.

Areas with immense carbon dioxide and sulphur dioxide pollution increases rain water acidity, which in turn causes moisture in the atmosphere to dissolve these gases and produce acid rain.

7 0
4 years ago
Read 2 more answers
What is the iupac name of N2O4​
Bess [88]

Answer:

Denitrogen tetraoxide

Explanation:

According to international union of pure and applied chemistry , N204

Is Denitrogen tetraoxide.

7 0
3 years ago
Read 2 more answers
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