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shutvik [7]
3 years ago
7

Can someone please help me with these questions. image attached

Chemistry
1 answer:
Radda [10]3 years ago
7 0
Question 9. The first one is the smallest. Anything with a negative exponent is going to be less than 1, the .00000241. The exponent tells you the number of zeroes to the right of the decimal point. Farther to right gets smaller and smaller.

Question 10. The last one is true. If the last digit is smaller than 5, drop the digit, and do not change. (If it is a 5 or larger, the digit before it would round up)
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As water molecules move through the hydrological cycle, water both gains and loses energy. in which case would the water be losi
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The correct answer is condensation

That is because energy is used to break bonds, so condensation where bonds are made actually loses energy because it turns into liquid.
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What are three physical factors that can be done to speed up a chemical reaction
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Temperature
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A neutral atom has 1 valence electron and its atomic mass is 39. How many
uranmaximum [27]

Answer: I think probaly wrong so probaly dont

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Explanation:

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3 years ago
If 3.0 moles of hydrogen react, how many grams of nitrogen will be used? Round your answer to the nearest whole number. N2 + 3H2
Iteru [2.4K]

Answer:

28g

Explanation:

Given parameters:

Number of moles of hydrogen  = 3moles

Unknown:

Mass of nitrogen used = ?

Solution:

 To solve this problem, let us establish the balanced reaction equation first;

             N₂  + 3H₂ →  2NH₃

From the balanced reaction equation;

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Now,

   Mass of Nitrogen  = number of moles x molar mass

         Molar mass of N₂  = 2(14) = 28g/mol

   Mass of Nitrogen  = 1 mole x 28g/mole  = 28g

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3 years ago
The half-life of f-20 is 11.4 seconds. when there are 200 atoms of f-20 in a sample, a scientist starts a stopwatch. the scienti
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There should only be 25 atoms remaining
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