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4vir4ik [10]
3 years ago
9

Does a physical change make a new substance

Chemistry
1 answer:
sasho [114]3 years ago
6 0

Answer:

no it does not fftyhhhhhhvvvv

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The concentrations of Fe and K in a sample of riverwater are 0.0400 mg/kg and 1.30 mg/kg, respectively. Express the concentratio
Ierofanga [76]

Answer :

The concentration in molality of Fe is, 7.1\times 10^{-7}mol/kg

The concentration in molality of K is, 3.3\times 10^{-5}mol/kg

Explanation:

First we have to calculate concentration in molality of Fe.

Molar mass of Fe = 56 g/mol

Concentration of Fe = 0.0400 mg/kg = 4\times 10^{-5}g/kg

Conversion used : 1 g = 1000 mg

\text{Concentration in molality}=7.1\times 10^{-7}mol/kg

Thus, the concentration in molality of Fe is, 7.1\times 10^{-7}mol/kg

Now we have to calculate concentration in molality of K.

\text{Concentration in molality}=\frac{\text{Concentration of K}}{\text{Molar mass of K}}

Molar mass of K = 39 g/mol

Concentration of K = 1.30 mg/kg = 1.3\times 10^{-3}g/kg

Conversion used : 1 g = 1000 mg

\text{Concentration in molality}=\frac{1.3\times 10^{-3}g/kg}{39g/mol}

\text{Concentration in molality}=7.1\times 10^{-7}mol/kg

Thus, the concentration in molality of K is, 3.3\times 10^{-5}mol/kg

5 0
3 years ago
2. Mercury-197 is used for kidney scans and has a half-life of 3 days. If 32 grams of
VLD [36.1K]
<h3>Answer:</h3>

1 grams Mercury-197

<h3>Explanation:</h3>

From the question,

The radioisotope is Mercury-197

The half life of Mercury-197 is 3 days

Starting mass is 32 grams

Time taken is 15 days

We are required to calculate the final mass of the radioisotope after 15 days.

  • Note that, half life is the time taken by radioisotope to decay by half its original amount.
  • In this case, the half life of mercury-197 is 3 days, therefore, it takes three days for a mass of mercury-197 to decay by half its original mass.

Therefore, using the formula;

Final amount = Starting mass × (1/2)^n

where n is the number of half-lives (ratio of time to half life)

In our case, n = 15 days ÷ 3 days

                      = 5

Therefore;

Final mass = 32 g × (1/2)^5

                  = 32 g × 1/32

                 = 1 g

Therefore, the amount of mercury-197 in the shipment that will arrive is 1 g.

8 0
3 years ago
When an oxygen atom forms an ion, it gains two electrons. Identify the electrical charge of the oxygen ion.
mel-nik [20]
"-2" is the electric charge of the oxygen ion among the following choices given in the question. It actually needs two electrons to complete the stable outer shell. The correct option among all the options that are given in the question is the third option or option "C". I hope that the answer has helped you.
5 0
3 years ago
Read 2 more answers
Used in kitchen utensils. <br><br>what is this MNMULUAI​
Gnesinka [82]

Answer:

the best person to whom it may be able or chulbul the same day of Ch-2 Ch-4 book exercise in a great day and I will join you for your voice is not coming to the same day

3 0
3 years ago
Read 2 more answers
A chemist must dilute 61.9 mL of 548. nM aqueous sodium carbonate (Na2CO3) solution until the concentration falls to 484. nM . H
maw [93]

Answer:

The final volume will be "70.08 mL".

Explanation:

The given values are:

Molar mass,

M1 = 548 nM

or,

     = 5.48\times 10^{-7} \ M

M2 = 484 nM

or,

      = 4.84\times 10^{-7} \ M  

Volume,

V1 = 61.9 mL

V1 = ?

By using the expression, we get

⇒ M1\times V1=M2\times V2

or,

⇒            V2=\frac{M1\times V1}{M2}

By substituting the values, we get

                    =\frac{5.48\times 10^{-7}\times 61.9}{4.84\times 10^{-7}}

                    =\frac{339.212}{4.84}

                    =70.08 \ mL

7 0
3 years ago
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