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IgorLugansk [536]
3 years ago
6

what is the most appropriate unit to measure the following; the length of a football field. b) the diameter of a tennis ball​

Chemistry
1 answer:
hjlf3 years ago
6 0

Explanation:

a) m (metre)

b) mm (millimeter)

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Select True or False: The reaction of hydrogen chloride gas with propene will yield 1-chloropropane as the main product
kifflom [539]

Answer:

False

Explanation:

My first response got deleted by brainly so here, again

3 0
2 years ago
the _ of an element is the average mass of an element naturally occurring atom, or isotopes,taking into account the _ of each is
NARA [144]

Answer:

the<u> atomic mass</u> of an element is the average mass of an element naturally occurring atom, or isotopes, taking into account the <u>percentage</u> of each isotopes​

Explanation:

The atomic mass of an element is obtained by obtaining the relative abundances (in percentages) of naturally occurring atoms and the masses of the isotopes. The atomic mass can also be defined as the sum of the protons and the neutrons in the nucleus of an element.

In the periodic table, the atomic mass is indicated below the symbol of each of the elements and is usually in the decimal form.

7 0
3 years ago
The table shows five items that a person may consider including in a safety contract.
zhenek [66]

Answer:

1,2, and 5

Explanation:

5 0
3 years ago
34 atoms of carbon (C) react with 22 molecules of hydrogen gas (H2). How many molecules of methane (CH4) will be formed, and wha
kolbaska11 [484]

Answer:

11 molecules of CH4.

23 atoms of C is the leftover.

Explanation:

Hello!

In this case, for the formation of methane:

C+2H_2\rightarrow CH_4

We can see there is an excess of carbon based on their stoichiometry, because the needed amount of hydrogen gas molecules would be:

molecules _{H_2}=34atomC*\frac{2molec\ H_2}{1atomC} =68molec\ H_2

Thus, the formed molecules of methane are computed below:

molec\ CH_4=22molec\ H_2 *\frac{1molec\ CH_4}{2molmolec\ H_2} \\\\molec\ CH_4=11molec\ CH_4

In such a way, the leftover of carbon atoms are:

atoms \ C^{left over}=34-22molec\ H_2*\frac{1atoms C}{2molec\ H_2} \\\\atoms \ C^{left over}=23 atoms C

Best regards!

4 0
3 years ago
Which of the following is a balanced chemical equation? A, H2O2 → H2O + O2
LenKa [72]
I believe it's D! Hope you can help with my question!
3 0
3 years ago
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