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MrRissso [65]
3 years ago
9

How many grams of calcium are in 2.65 g of CaCO3?

Chemistry
1 answer:
myrzilka [38]3 years ago
3 0

Answer:

2.56

Explanation:

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What is 0.00550 g converted to mg
Mila [183]

Answer: it is 5.5 mg

Explanation:

you have to multiply the mass value by 1000

5 0
3 years ago
Which of the following is a nonrenewable energy source? O A. Solar B. Hydroelectric C. Natural gas D. Biomass
Alex

Answer:

C. natural gas

Explanation:

Solar comes from the sun, which if it became nonrenewable, we would be dead. hydroelectric comes from water and Dams, which water is reproduced through rain. Biomass are things like leaves, which are seasonally reproduced.

8 0
3 years ago
Which statement about Fe is supported by the modern atomic theory but not John Dalton’s theory?
lana66690 [7]

Answer:

The correct option is B

Explanation:

One of the claims of John Dalton's atomic theory is that atom is the smallest unit of matter (which suggests that there are no particles smaller than an atom in any matter). This claim has been disproved by the modern atomic theory which established that there are particles smaller than atom (called subatomic particles). These particles are electrons, protons and neutrons.

One of the modern atomic theory was by Neils Bohr, who proposed that <u>electrons move in circular orbits around the central nucleus</u>. Thus, the electrons of iron can also be said to be present in a region of space (circular path) around the nucleus. This proves that option B is the correct option as John Dalton's theory did not even recognize the electron(s) nor the nucleus.

5 0
3 years ago
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Which of the following material is the weakest thermal conducters
alisha [4.7K]
Well you didn’t post any but I’m hoping that either plastic, lead, wood, glass, or paper, are an option.
8 0
3 years ago
How many moles of molecules are in 40g of H2O?
soldier1979 [14.2K]
Molecular mass of H2O is: 16+2*1=18
so moles of 40g of H2O is: 40/18=2.22
6 0
3 years ago
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