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3 years ago

Energy is neither created or destroyed true or false

Chemistry

1 answer:

Dafna11 [192]3 years ago

7 0

That statement is true.

-TTL

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Choose all the answers that apply.

agasfer [191]

Answer:

hydrogen are converted into energy I dont know other

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2 years ago

Are sharks mammals pls answer

ddd [48]

Answer:

no they are a fish

Explanation:

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3 years ago

A small cube of iron and a large flat sheet of iron contain the same volume. Which one will completely rust first? Explain why.

allochka39001 [22]

Flat as more oxygen and water can react over it think of it like this would a cube rust faster than a sheet

6 0

2 years ago

Identify whether each element is a halogen, a noble gas, or nonmetal only.

OLga [1]

Answer:

Astatine: Halogen

Nitrogen: Non-Metal

Krypton: Non-Metal, Noble Gas

Chlorine: Non-Metal

Sulfur: Non-metal

Explanation:

5 0

3 years ago

When 0.250 moles of KCl are added to 200.0 g of water in a constant pressure calorimeter a temperature change is observed. Given

777dan777 [17]

Explanation:

Upon dissolution of KCl heat is generated and temperature of the solution raises.

Therefore, heat generated by dissolving 0.25 moles of KCl will be as follows.

$17.24 kJ/mol \times 0.25 mol$

= 4.31 kJ

or, = 4310 J (as 1 kJ = 1000 J)

Mass of solution will be the sum of mass of water and mass of KCl.

Mass of Solution = mass of water + (no. of moles of KCl × molar mass)

= 200 g + $(0.25 mol \times 54.5 g/mol)$

= 200 g + 13.625 g

= 213.625 g

Relation between heat, mass and change in temperature is as follows.

Q = $mC \Delta T$

where, C = specific heat of water = $4.184 J/g^{o}C$

Therefore, putting the given values into the above formula as follows.

Q = $mC \Delta T$

4310 J = $213.625 g \times 4.184 J/g^{o}C \times \Delta T$

$\Delta T = 4.82^{o}C$

Thus, we can conclude that rise in temperature will be $4.82^{o}C$ .

6 0

2 years ago