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CaHeK987 [17]
3 years ago
13

Whats the answer to number 5?

Chemistry
2 answers:
Hunter-Best [27]3 years ago
5 0
C is the answer because he wants to know if less force is needed to pull on a slippery surface which reduces friction
rosijanka [135]3 years ago
5 0
The answer to number 5 is D
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In your own words, explain what the concept of density means—without using the formula.
vladimir1956 [14]

Answer:

The amount of mass in a certain volume

Explanation:

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3 years ago
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An archaeologist finds 14C in a sample of material to be decaying at 20 Geiger Counter clicks per second. A modern equivalent sa
Kay [80]

Answer:

17188 years

Explanation:

Recall the formula;

0.693/t1/2 = 2.303/t log(No/N)

t1/2 = half life of 14C

No = initial activity of 14C

N = activity of 14C at time t

t = age of the sample

Substituting values

0.693/5730= 2.303/t log(160/ 20)

1.21 * 10^-4= 2.0798/t

t = 2.0798/1.21 * 10^-4

t = 17188 years

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3 years ago
What volume of a 0.2089 M KI solution contains enough KI to react exactly with the Cu(NO3)2 in 40.88 mL of a 0.3842 M solution o
tatyana61 [14]

Explanation:

As molarity is the number of moles placed in a liter of solution. Therefore, no. of mole = Molarity × volume of solution in liter

Hence, moles of Cu(NO_{3})_{2} will be calculated as follows.

No. of mole of Cu(NO_{3})_{2} = 0.3842 M \times 0.04388 L = 0.0168 mole

According to the given reaction, 2 mole of Cu(NO_{3})_{2} react with 4 mole of KI.

Therefore, for 0.0168 mole amount of Cu(NO_{3})_{2} required will be as follows.

Cu(NO_{3})_{2} = 0.0168 \times \frac{4}{2}

                       = 0.0337 mole of KI

Hence, volume of KI required will be calculated as follows.

               Volume = \frac{\text{no. of moles}}{Molarity}

    Volume of KI = \frac{0.0337}{0.2089}

                           = 0.1614 liter

                            = 161.4 ml            (as 1 L = 1000 mL)

Thus, we can conclude that 161.4 ml  volume of a 0.2089 M KI is required for the given situation.

5 0
3 years ago
Cell and chromosome characteristics? ​
rusak2 [61]

Answer:

hope the inserted image will help :)

Explanation:

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Barium is in period 6 and magnesium is in period 3 of the periodic table. Which element would lose one electron more easily, and
velikii [3]
I believe the correct answer would be barium. It is the element between the two that would lose one electron more easily. This is because it has a higher first ionization energy which means the that the probability of it existing as an ion would be higher than magnesium.
4 0
4 years ago
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