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Ludmilka [50]
3 years ago
15

Which values are written in proper scientific notation? Check all that apply. –350 –350.00 –3.50 × 104 0.000350 3.50 × 104 3.50

× 10–4 35.0 × 10–5 3,500
Chemistry
2 answers:
Oksanka [162]3 years ago
7 0
-3.50 * 10^4
3.50 * 10^4
3.50 * 10^-4
algol133 years ago
7 0

Answer : The correct options are, -3.50\times 10^{4},3.50\times 10^{4}\text{ and }3.50\times 10^{-4}

Explanation :

Scientific notation : The way or representation of expressing the number that are too big or too small that is written in the decimal form. That means always written in the power of 10 form.

For example : 700 is written in scientific notation as, 7.0\times 10^2

According to the question, -3.50\times 10^{4},3.50\times 10^{4}\text{ and }3.50\times 10^{-4}  are written in proper scientific notation. While the other options are not written in proper scientific notation.

Therefore, the correct options are, -3.50\times 10^{4},3.50\times 10^{4}\text{ and }3.50\times 10^{-4}

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Answer:

2CH3CHO + O2 → 2CH3COOH

7 0
2 years ago
What mass of F2 is needed to produce 180 g of PF3 if the reaction has a 78.1% yield?
nexus9112 [7]

Answer:

91.26 g

Explanation:

Given data:

Mass of PF₃ = 180 g

Mass of F₂ required = ?

Solution:

Chemical equation:

P₄ + 6F₂   → 4PF₃

Moles of PF₃:

Number of moles = mass/ molar mass

Number of moles = 180 g/ 88 g/mol

Number of moles = 2.05 mol

Now we will compare the moles of PF₃ with F₂.

                        PF₃            :           F₂

                          4               :           6

                          2.05         :           6/4×2.05 = 3.075

Mass of  F₂:

Mass of F₂ = moles × molar mass

Mass of F₂ = 3.075 mol × 38 g/mol

Mass of F₂ =  116.85 g

If reaction yield is 78.1%:

116.85 /100 ×78.1 = 91.26 g

6 0
2 years ago
How many grams of sodium are needed to produce 12.5 g of sodium oxide
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1. (b) I hope this helps!

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3 years ago
The charge of a beryllium-9 nucleus is<br> (1) +13 (3) +5<br> (2) +9 (4) +4
FinnZ [79.3K]
Beryllium has an atomic number of 4, so a beryllium atom has 4 protons in its nucleus.

Since the charge of 1 proton is +1 and neutrons in the nucleus have 0 charge, the correct answer is (4) +4.

Hope this helps~
8 0
3 years ago
Read 2 more answers
Which chemistry studies non carbon based structures?
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Answer:

Inorganic chemistry

Explanation:

Meaning: Inorganic chemistry studies substances that do not contain carbon; therefore, it studies non carbon based structure.

8 0
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