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Vinvika [58]
3 years ago
12

What would be the effect on the calculated ratio (mole of copper:mole of iron) if:

Chemistry
1 answer:
kotegsom [21]3 years ago
5 0

Explanation:

Since the ratio is Cu/Fe, if some Fe were lost due to spillage, the Cu/Fe ratio would INCREASE because Fe would be lower.

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Adding 5.25 g of to 130 g of water in a coffee-cup calorimeter (with stirring to dissolve the salt) resulted in a decrease in te
xxTIMURxx [149]

Answer:

ΔHrxn =  - 1534.3 J

Explanation:

Given the assumptions and the formula for the change in enthalpy:

ΔHrxn = m x C x ΔT,  where

               m is the mass of solution given 135.4 g

               C is the heat capacity 4.2 J/g .K  and,

               ΔT is the change in temperature

we have ,

T₁ = ( 18.1 + 273) K = 291.1 K

T₂ = ( 15.4 +273) K = 288.4 K

ΔHrxn =  135.3 g x 4.2 J/gK x ( 288.4 -291.1 ) K = - 1534.3 J

After verifying our result has the correct unit, the answer is -1534.3 Joules, and the negative sign tells us it is an endothermic reaction decreasing the final temperature.

4 0
3 years ago
- A jackrabbit's powerful legs are an example of a
dusya [7]

Answer:

I think it is b.

Explanation:

8 0
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Solutions and colloids which contain similarly sized particles can be effectively separated using paper filtration.
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In a given column of the periodic table the elements have _____.
kakasveta [241]

Answer:

a. similar properties

Explanation:

In a given column of the periodic table, the elements have similar properties.

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Elements in the same group have the same number of valence electrons after their group number.

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The valence electrons of an atom determines its chemical properties. So, all elements in the same group have the same chemical properties.

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