How many elements are found in the following chemical equation? K + Cl → KCl A. 1 B. 2 C. 3 D. 0
2 answers:
Answer: Option (B) is the correct answer.
Explanation:
An element is defined as a substance that contains same type of atoms.
For example, element K contains only atoms of potassium.
Whereas a substance in which two or more different elements chemically combine together in a fixed ratio by mass is known as a compound.
For example, KCl contains atoms of K and Cl in 1 : 1 ratio. Hence, it is a compound.
Therefore, in the chemical reaction, there are only two elements which are K and Cl.
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Answer:
Q = 2.60 • J
Explanation:
Our specific heat capacity equation is:
Q = mC∆T
Q is the energy in joules.
m is the mass of the substance.
∆T is the temperature chance.
Let's plug in what we know.
- We have 76.0 g of octane
- The specific heat capacity of octane is 2.22 J/(g•K)
- The temperature increases from 10.6º to 26.0º (a 15.4º increase)
Q = 76.0(2.22)(15.4)
Multiply.
Q = 2598.288
We want three significant figures.
Q = 2.60 •
or
Q = 2590 J
Hope this helps!