Answer: Hydrogen and helium
Explanation:
A. 8,330 --> 8.33 × 10^3
B. 83.3 --> 8.33 × 10^1
C. 0.00833 --> 8.33 × 10^-3
D. 0.0833 --> 8.33 × 10^-2
E. 83,330 --> 8.33 × 10^4
Hope this helps!
Answer: There are 
atoms of carbon in the given moles.
Explanation:
We are given 24.6 moles of carbon and we need to find the number of atoms.
According to mole concept:
1 mole of an element contains 
number of atoms.
So, 24.6 moles of carbon will contain 
atoms.
Hence, there are atoms of carbon in the 24.6 moles of carbon.
Answer: D. Use tools to help improve their senses when they make observations.
Observation is the outcome of a scientific procedure, which is followed to answer the questions related to a scientific inquiry. In order to make observation scientists need to use tools that can help in improving their senses like visual, sensation and hearing aids, so as to make observation accurate, and conclusive in a research.
