Answer:
Physical change
Explanation:
A physical change is one in which no new substance is formed and can be reversed using physical methods.
When we mix the salt and water, we have merely carried out a physical change. No new substance was formed. To recover the salt, we simply heat the solution to dryness.
Hence, this is an example of a physical change.
Answer:
As the specific heat capacity for pure diamond is 0.5091
and it is different from the specific heat capacity found that is 0.2699, the diamond sample is not pure.
Explanation:
1. As the problem says the equation that describes the amount of heat gained or lost by a substance is:
q=Cp*m*ΔT
where q is the amount of heat, Cp is the specific heat capacity, m is the mass and ΔT is the change in the temperature.
2. Solving for specific heat capacity:
3. Replacing values:
As the specific heat capacity for pure diamond is 0.5091 and it is different from the specific heat capacity found that is 0.2699, the diamond sample is not pure.
Answer:
True
Explanation:
The accuracy level is usually determined by the difference between the experimental and correct value. It is important to note that the smaller the difference between the average experimental value and the correct (true) value, the more accurate it is.
When the difference is large then it means the accuracy level is low and not up to the required standard.
CO2 contains one atom of carbon and two atoms of oxygen.
The molecule is called Carbon dioxide, indicating that it is covalent and that there are two oxygen present.
