Heat can be calculated using the formula:
U = mCpΔT
where:
U = internal energy or heat
m = mass of substance
Cp = specific heat capacity of a substance (constant)
ΔT = change in temperature = (Tf - Ti)
In the problem, we are given all these terms except for the Cp, which can help identify what the substance is. This is because Cp is unique and constant for a particular substance.
9760 = 200(Cp)(45-25)
Cp = 2.44 J/g-°C
Now, look for a library or list of specific heat capacities. Look for a substance that has the closest value to what you calculated. Based on data, the substance used is ethyl alcohol which has a Cp of exactly 2.44 J/g-°C
You can use this as reference: http://www.engineeringtoolbox.com/specific-heat-capacity-d_391.html
Out of all given options, determining if a rock is magnetic is an example of investigating an intensive property
Answer: Option C
<u>Explanation:</u>
Every element or compound consists of its unique physical and chemical properties. And these physical properties of the elements can be further classified as intensive and extensive physical properties. The intensive physical properties are the one which did not have any influence with the mass or amount of the element or compound. While the extensive properties will vary depending upon the amount and mass of the compound.
Thus, in this case, among the options given the investigations like weighing of sand, length of wire and recording volume of water will vary depending upon the size and amount of the inspecting substance. But the investigation of determining the magnetic nature of rock does not depend on the amount or size of the investigating substance.
Answer: 2 atoms
Explanation: A molecular formula of the compound carbon dioxide is CO 2 . One molecule of carbon dioxide consists of 1 atom of carbon and 2 atoms of oxygen.
