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ehidna [41]
2 years ago
9

Help me with these two please​

Chemistry
2 answers:
Anna007 [38]2 years ago
7 0

answer -

13 is the last one

14 is the first one

explanation for number 13 - the law of conservation of mass means that the number of atoms of the products is more than the number of atoms in the reactants. the total amount of matter (atoms) before and after a chemical reaction (change), remains the same.

explanation for number 14 -  a chemical equation describes a chemical reaction. reactants are starting materials and are written on the left-hand side of the equation. products are the end result of the reaction and are written on the right-hand side of the equation.

hope this helps :) have a nice day

**please let me know if this was wrong/not what you were looking for**

prohojiy [21]2 years ago
3 0

Answer:

13.A

14.B?

on 14 i don't know

Explanation:

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Question
madam [21]

Answer:

The specific heat of the metal is 2.09899 J/g℃.

Explanation:

Given,

For Metal sample,

mass = 13 grams

T = 73°C

For Water sample,

mass = 60 grams

T = 22°C.

When the metal sample and water sample are mixed,

The addition of metal increases the temperature of the water, as the metal is at higher temperature, and the  addition of water decreases the temperature of metal. Therefore, heat lost by metal is equal to the heat gained by water.

Since, heat lost by metal is equal to the heat gained by water,

Qlost = Qgain

However,

Q = (mass) (ΔT) (Cp)

(mass) (ΔT) (Cp) = (mass) (ΔT) (Cp)

After mixing both samples, their temperature changes to 27°C.

It implies that , water sample temperature changed from  22°C to 27°C and metal sample temperature changed from 73°C to 27°C.

Since, Specific heat of water = 4.184 J/g°C

Let Cp be the specific heat of the metal.

Substituting values,

(13)(73°C - 27°C)(Cp) = (60)(27°C - 22℃)(4.184)

By solving, we get Cp =

Therefore, specific heat of the metal sample is 2.09899 J/g℃.

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Whats the complete chemical symbol for the ion that has : 13 neutrons 11 protons , and 9 electrons.
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