Answer:
Here is what I got from reading this question...
Explanation:
So if you dissolve 7.5625- g of CaCl2 in water, dissolve well and then add distilled in a 250- ml standard flask upto the mark and shake well for uniform Concentration, you will get 0.25- M CaCl2 solution.
They should throw it away and use a different one
Answer:

Explanation:
Hello,
In this case, the relationship between the mass, heat, temperature and heat capacity id given by:

In such a way, the temperature change results:

Clearly it is a positive change which means the temperature increases as heat is added.
Regards.
Answer:
See the answer below
Explanation:
A weak solution of acid would gradually dissolve the calcium carbonate in limestone statues. For example, dilute sulphuric acid formed from the dissolution of SO2 in rainwater would react with calcium carbonate according to the following equation;

<em>Generally, the rate of any reaction depends on a host of factors such as temperature, pressure, presence of catalysts, and surface area of reactants. The higher the surface area of reactants, the higher the rate of reaction.</em>
In this case, the rate of reaction of the dilute acid and the calcium carbonate depends on the surface area of the calcium carbonate which happens to be the only solid reactant. <u>Statues with intricate carvings seem to break down more quickly than ordinary statues because they offer more surface area for reaction to take place</u>. The intricate carvings create more surface area for reactions when compared to statues without intricate carvings.
Answer:
D. 1.0 x 10-8.43
Explanation:
The pH is an unit of concentration in chemistry used to determine the acidity -or basicity- of a particular solution. Is used in quality control to determine the security of a product for consumers.
The equation is:
pH = -log [H₃O⁺]
As pH = 8.43:
8.43 = -log [H₃O⁺]
10^-8.43 = [H₃O⁺]
1.0x10 -8.43 = [H₃O⁺]
Right option is:
<h3>D. 1.0 x 10-8.43
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