CHEMISTRY HIGH SCHOOL

calculate the concentration in parts per million (ppm) of DDT if a sample size of 2000 g contained 0.050 g DDT

Answers

Answer 1
Answer:

Answer:

= 25 ppm

Explanation:

  • PPM also refers to parts per million, it represents a low concentration of a solution. It represents 0.001 gram or a milligram in a 1000 mL, which equivalent to 1 mg per liter.

Given; a sample size of 2000 g contained 0.050 g DDT

It means, 2000 mL sample contained 50 mg DDT

Therefore in ppm we get;

= 50 mg/ 2 L

= 25 mg/L

= 25 ppm


Related Questions

COLLEGE

Why is an electrolyte able to conduct electricity while a nonelectrolyte cannot? a nonelectrolyte forms ions with equal charges. a nonelectrolyte forms ions which do not dissolve in water. an electrolyte readily dissociates into ions in solution. an electrolyte is able to donate electrons to the water in solution?

Answers

To solve this, we must know each and every concept that is related to electrolytic solution. Therefore, the correct option is option B that is  an electrolyte readily dissociates into ions in solution.

What is electrolyte?

In chemistry and physics, an electrolyte is a substance that conducts electric current by separating into positively and negatively charged particles known as ions, which migrate toward and are normally released at the negative and positive terminals.

Acids, bases, and salts are the most common electrolytes, which ionize when saturated in solvents such as water or alcohol.  An electrolyte readily dissociates into ions in solution.

Therefore, the correct option is option B that is  an electrolyte readily dissociates into ions in solution.

To know more about electrolyte, here:

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Correct answer is
 An electrolyte readily dissociates into ions in solution.
HIGH SCHOOL

How is a pure substance different from a mixture? A. Pure substances cannot be separated by physical means.
B. Mixtures cannot be separated by physical means.
C. A pure substance is heterogeneous.
D. A mixture is made of one substance.

Answers

Pure substances are made by a single kind of matter and it cannot be separated whereas, mixtures are substance formed by the mixing of two or more pure substances. Thus, option A is correct.

What are mixtures?

Mixtures are combination of two or more substances which are mixed in a homogenous or heterogenous fashion. Homogenous mixtures are those which appear to be one component like salt solution where only one phase exists.

Heterogenous mixtures forms different phases and the individual components are not uniform will seen separately. Mixtures can be separated based on the properties of the individual components such as using distillation, filtration, chromatography etc.

Pure substances are formed by single type of atoms for example pure water, fruit pies, pure acids etc. They contains their own particles only. Hence, option A is correct.

To find more about mixtures, refer the link below:

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MIDDLE SCHOOL

Which group of elements have almost no reactivity​

Answers

Answer: group zero (noble or rare)

Explanation:

Answer:

Group 0 the noble gases

HIGH SCHOOL

The change in isotopes over time due to the emission of radioactive particles is known as A. radiometric dating.
B. radioactive decay.
C. absolute-age dating.
D. half-life.

Answers

It is known as radioactive decay
MIDDLE SCHOOL

With all his heart Neil Armstrong weighed 360 pounds on earth and when he landed on the mood he weighed 60 pounds why? A.his mass changed while traveling to the moon

B.the gravity on the mood is six times the gravity on earth

C.the gravity on the moon is less then then the gravity on earth

D.he experienced the effects of a gravity slingshot

Answers

C because its less gravity

The answer is c because the moon has no gravity

HIGH SCHOOL

Fluorine has nine protons and nine electrons. It is in column 17 on the periodic table. How many valence electrons does hydrogen have? 2 5 7 9

Answers

Answer:

Hydrogen has one electron

Explanation:

Hydrogen is the first element in the Periodic Table, so it has only one valence electron.

For elements in Groups 13 to 18, then number of valence electrons equals the Group number – 10.

Fluorine is in Group 17, so it has seven valence electrons.

Answer:

7  i just did the test and got it right

Explanation:

COLLEGE

How many grams of sulfur dioxide (SO2) are there in a 3.50 L container at 100°C and a pressure of 2.00 atm?

Answers

Answer: The mass of sulfur dioxide is 14.6 grams

Explanation:

To calculate the number of moles, we use the equation given by ideal gas, which follows:

where,

P = pressure of the sulfur dioxide = 2.00 atm

V = Volume of the sulfur dioxide = 3.50 L

T = Temperature of the mixture =

R = Gas constant =

n = number of moles of sulfur dioxide = ?

Putting values in above equation, we get:

To calculate the number of moles, we use the equation:

Moles of sulfur dioxide = 0.228 moles

Molar mass of sulfur dioxide = 64 g/mol

Putting values in above equation, we get:

Hence, the mass of sulfur dioxide is 14.6 grams

COLLEGE

The reaction of 50 mL of Cl2 gas with 50 mL of C2H4 gas via the equation: Cl2 (g) + C2H4 (g) → C2H4Cl2 (g) will produce a total of ________ mL of products if pressure and temperature are kept constant.

Answers

Answer:

There will be produced a total of 50 mL of products (C2H4Cl2)

Explanation:

Step 1: Data given

Volume of Cl2 = 50 mL

Volume of C2H4 = 50 mL

Step 2: The balanced equation:

Cl2(g) + C2H4(g) → C2H4Cl2(g)

For 1 mol of Cl2 we need 1 mole of C2H4 to produce 1 mole of C2H4Cl2

Step 3: Calculate volume of C2H4Cl2

Since pressure, temperature are kept cosntant, we can calculate the final volume as following:

(5There will be produced a total of 50 mL of products (C2H4Cl2)0 mL Cl2) * (1 mol C2H4Cl2 / 1 mol Cl2) = 50 mL C2H4Cl2

Answer:

50 mL

Explanation:

According to Avogadro's law, the volume of an ideal gas is proportional to the number of moles. Then, if we have 50 mL of Cl₂ and 50 mL of C₂H₄, we can affirm that we have the same number of moles of both.

The balanced equation is:

Cl₂(g) + C₂H₄(g) → C₂H₄Cl₂(g)

The molar ratio Cl₂:C₂H₄:C₂H₄Cl₂ is 1:1:1. Then, when x moles of Cl₂ react with x moles of C₂H₄, they produce x moles of C₂H₄Cl₂. Assuming pressure and temperature are kept constant, the volume corresponding to x moles is 50 mL.

MIDDLE SCHOOL

Sound travels on air molecules.


TrueFalse

Answers

the answer is true the name for it is sound waves.

yeeeeeeeeeeeeeeeeeeeeeeeee.

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