Answer:
C. Sold solution
Explanation:
Using method of elimination;
A. Pure substance.
Bronze is not a Pure substance because the proportions of copper and tin are not the same in all bronze. This option is wrong.
B. Colloidal Suspension
This option is wrong. Colloidal suspension involves one substance dispersed in another.
C. Sold solution
The bronze bell is an alloy. This definition suitable represents it. It is a solid solution containing copper and tin. This is the correct option.
D. Heterogeneous Mixture
Bronze is a mixture, however it is homogeneous and not heterogeneous. his is because one can not distinguish the copper from the tin in the mixture.
The weighted average of a penny is = 67.9g
<h3>Calculation of average weight</h3>
The sample of penny for pre 1982 is a total of = 18 pennies.
The mass of each penny for pre 1982 = 3.1
Therefore the total weight for penny for pre 1982
= 18×3.1
= 55.8
The sample of penny for post 1982 is a total of = 32 pennies.
The mass of each penny for post 1982 = 2.5
Therefore the total weight for penny for post 1982
=32×2.5
= 80
The weighted average
= 55.8+80/2
= 135.8/2
= 67.9g
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The color change would only effect the appearance of the substance, so it would be a physical change.
Answer: physical change
Here, we are required to determine the pressure of the sample of gas trapped in the open-tube mercury manometer shown below if Atmospheric pressure is 767 mmHg and pressure head, h = 8.9 cmHg.
- The pressure of the sample of gas trapped in the open-tube mercury manometer is;. 856 mmHg
According to the question;
- The atmospheric pressure is 767 mmHg
- The gauge pressure is 8.9 cmHg = 89mmHg.
The absolute pressure, P(abs);
is given mathematically as;
Absolute pressure = Atmospheric pressure + gauge pressure.
P(abs) = P(atm) + P(gauge)
P(abs) = 767mmHg + 89mmHg.
P(abs) = 856 mmHg.
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