The maximum allowable concentration
of lead in drinking water is 9.0 ppb. If 2.0
X 10 grams of lead is present in 250
mL of water, is it safe to drink the water?
Support your answer with mathematical
proof.​

Answers

Answer 1

We are given:

Maximum concentration of Lead in water = 9 ppb

Mass of Lead in the given solution = 20 grams

Volume of water in the given solution = 250 mL

What is 1 ppb?

1 ppb, short for parts-per-billion. As from its name itself, ppb is used to find how many molecules of solute are present per 1 Billion molecules of the solvent

you can also use it in grams to get the formula:

1 ppb = 1 gram of solute / 1 Billion grams of Solvent

Finding the Ideal ppb concentration:

We are given that the maximum allowed concentration is 9 ppb

which means that we need 9 grams of the solute per 1 Billion grams of Solvent:  9 grams of Solute / 10⁹ grams of Solvent

ppb Concentration of the given solution:

We have 20 grams of Solute in 250 mL of water

Since the density of water is 1 gram/mL

20 grams of Solute / 250 grams of Solvent

As we can see, this fraction is FAR more large that the maximum ppb concentration

This means that the concentration of Lead in the Given solution is higher than the maximum amount and Hence, is unfit to drink


Related Questions

How could you draw a model of the element copper to show that it is different from the element gold?

please help me hope you understand helllllllpppppppppppppppppp meeeeeeeeee​

Answers

use the periodic table the atomic number of copper is 29 so neutral copper atoms have 29 protons and 29 electrons to estimate the number of neutrons in the atom round the atomic mass to 64 and subtract the atomic number the atomic number is the number of protons. do the same thing for gold and u have your atomic models for each.

Determine the mole ratio between N2 and NF3. Question is below..

Answers

Answer:

The mole ratio is --> 1: 2

5 moles of N2

Explanation:

The balanced equation shows us that for every mole of N2, 2 moles of NH3 will be produced.

This also means that in order for 10 moles of NH3 to be produced, 5 moles of N2 need to react

Answer:

The answer is given to you by as04621.

Explanation:

c. When 4.46 moles of ethylene, C2H4, burns in oxygen to give carbon dioxide and
water, how many grams of carbon dioxide are formed?
C₂H4 + 30₂
-
2 H2O + 2 CO2

Answers

Answer:

finding believability

What is the oxidation state of P in PO43-?
O A. +8
O B. +3
O C. +5
OD. +2

Answers

Answer:

the answer is +5

Explanation:

good luck :)

Why does a solid have a definite shape and volume?
A. The particles in a solid are not attracted to one another.
B. The particles in a solid vibrate around fixed locations.
C. The particles in a solid are not tightly packed.
D. The particles in a solid travel at a high speed of motion.

Answers

Answer:

B

Explanation:

The particles are bound to each other and they vibrate at an almost undetectable rate.

What type of energy drives the turbines that produce electricity from water?

Answers

Answer:

Wind energy

Explanation:

Answer: Wind energy

Explanation:

Calculate the hight of a column of liquid glycerol in meters required to exert the same pressure as 3.02 m if CCl4?

Answers

Answer:

Approximately [tex]3.81\; \rm m[/tex].

Explanation:

Look up the density [tex]\rho[/tex] of carbon tetrachloride, [tex]\rm CCl_4[/tex], and glycerol:

Density of carbon tetrachloride: approximately [tex]1.59\times 10^{3}\; \rm kg \cdot m^{-3}[/tex].Density of glycerol: approximately [tex]1.26\times 10^{3}\; \rm kg \cdot m^{-3}[/tex].

Let [tex]g[/tex] denote the gravitational field strength. (Typically [tex]g \approx 9.81\; \rm N \cdot kg^{-1}[/tex] near the surface of the earth.) For a column of liquid with a height of [tex]h[/tex], if the density of the liquid is [tex]\rho[/tex], the pressure at the bottom of the column would be:

[tex]P = \rho\cdot g \cdot h[/tex].

The pressure at the bottom of this carbon tetrachloride column would be:

[tex]\begin{aligned} P &= \rho \cdot g \cdot h \\ & \approx 1.59\times 10^{3} \; \rm kg \cdot m^{-3} \times 9.81\; \rm N \cdot kg^{-1} \times 3.02 \; \rm m \approx 4.71 \times 10^{4} \; \rm N \cdot m^{-2} \end{aligned}[/tex].

Rearrange the equation [tex]P = \rho\cdot g \cdot h[/tex] for [tex]h[/tex]:

[tex]\displaystyle h = \frac{P}{\rho \cdot g}[/tex].

Apply this equation to calculate the height of the liquid glycerol column:

[tex]\begin{aligned}h &= \frac{P}{\rho \cdot g} \\ &\approx \frac{4.71 \times 10^{4}\; \rm N \cdot m^{-2}}{1.26 \times 10^{3}\; \rm kg \cdot m^{-3} \times 9.81\; \rm N \cdot kg^{-1}} \approx 3.81\; \rm m\end{aligned}[/tex].

What kind of energy transfers between molecules of touching substances during conduction

Answers

Answer:

heat energy

Explanation:

Conduction is the transfer of heat energy from one substance to another or within a substance.

A.) A student titrated a 15.00-mL sample of a solution containing a weak, monoprotic acid with NaOH. If the titration required 17.73 mL of 0.1036 M NaOH to reach the equivalence point, calculate the concentration (in M) of the weak acid in the sample.

B.) If the sample solution described in A). contained 0.1845 g of the Weak Acid, calculate the molar mass (in g/mol) of the weak acid.

Answers

Answer:

A) 0.1225 M

B) 100.4 g/mol

Explanation:

Step 1: Write the generic neutralization reaction

HA(aq) + NaOH(aq) ⇒ NaA(aq) + H₂O(l)

Step 2: Calculate the reacting moles of NaOH

17.73 mL of 0.1036 M NaOH react. The reacting moles are:

0.01773 L × 0.1036 mol/L = 1.837 × 10⁻³ mol

Step 3: Calculate the reacting moles of HA

The molar ratio of HA to NaOH is 1:1. The reacting moles of HA are 1/1 × 1.837 × 10⁻³ mol = 1.837 × 10⁻³ mol.

Step 4: Calculate the molar concentration of HA

1.837 × 10⁻³ moles of HA are in a 15.00 mL volume. The molar concentration is:

M = 1.837 × 10⁻³ mol / 0.01500 L = 0.1225 M

Step 5: Calculate the molar mass of HA

1.837 × 10⁻³ moles of HA weigh 0.1845 g. The molar mass of HA is:

0.1845 g / 1.837 × 10⁻³ mol = 100.4 g/mol

How long did it take a bike to travel 20 miles in 12.5 mph?

Answers

Answer:

2 hours and 4 mins

2hrs and 4mins miles per hour

what is the weight of calcium oxide obtained from igniting 3.2g of calcium oxalate​

Answers

Answer:

1.4 g

Explanation:

Step 1: Write the balanced combustion reaction

CaC₂O₄ + 1/2 O₂ ⇒ CaO + 2 CO₂

Step 2: Calculate the moles corresponding to 3.2 g of CaC₂O₄

The molar mass of CaC₂O₄ is 128.10 g/mol.

3.2 g × 1 mol/128.10 g = 0.025 mol

Step 3: Calculate the moles of CaO formed from 0.025 moles of CaC₂O₄

The molar ratio of CaC₂O₄ to CaO is 1:1. The moles of CaO formed are 1/1 × 0.025 mol = 0.025 mol.

Step 4: Calculate the mass corresponding to 0.025 moles of CaO

The molar mass of CaO is 56.07 g/mol.

0.025 mol × 56.07 g/mol = 1.4 g

If the bark is stripped off a tree, the tree will

Answers

Answer:

may die depending on how completely it was girdled.

Explanation:

The IR spectrum of a solid can be taken by dissolving it to create a solution. An appropriate solvent is ________because its IR stretches are _______

Answers

Answer:

An appropriate solvent is carbon tetrachloride [tex](CCl_{4} )[/tex] because its IR stretches are not visible in the infrared region.

Explanation:

Non-polar solvents don not show peaks at the IR frequency region because they do not have dipoles which would absorb the infrared light. This makes them suitable solvents in IR Spectroscopy.

Therefore non-polar solvents such as CCl4 or Carbon disulfide are appropriate for the IR spectrum. They also do not interfere with the halide disks used in the spectrometer, as a solvent like water would.

Let me know if you need any other assistance.

The elaboration likelihood model emphasizes the use of __________ persuasion and __________ persuasion methods. A. direct . . . elaborative B. peripheral . . . elaborative C. direct . . . peripheral D. indirect . . . direct Please select the best answer from the choices provided A B C D

Answers

Answer:

It's C, direct and peripheral.

Explanation:

Just took the test

The elaboration likelihood model emphasizes the use of direct persuasion

and peripheral persuasion methods.

This theory involves a dual process which explains how attitudes are

changed in individuals through persuasion. The two methods of persuasion

include:

Direct persuasionPeripheral persuasion

These methods help in the formation of attitude which makes option C the

most appropriate choice.

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In what order do electrons fill orbitals?
A. Before pairing, 1 electron occupies each s and p orbital.
B. Electrons fill orbitals in order of increasing orbital energy.
C. Orbitals s, p, and then d fill in one energy level before starting the
next level.
D. The p orbitals fill before the s orbitals in an energy level.
SUBM

Answers

Answer:B electrons fill orbitals In order of their increasing energy from left to right

Explanation:

How many helium atoms does water (H20) contain?
OA) O
B) 1
C) 2
OD) 3

Answers

Answer:

it's zero

Explanation:

water is composed of hydrogen and oxygen

The diagram shows different forms of thermal energy transfer.
Which process is making the pot's handle hot?

Answers

Answer:

Conduction

Explanation:

The handle is touching the pot.

And I got it wrong

Which of the following is an organ in the digestive system heart, stomach, intestinal tissue, lungs

Answers

Answer:

stomach

Explanation:

stomach

Answer:

Stomach

Explanation:

The heart and lungs aren't part of the digestive system and intestinal tissue is just tissue, not the organ

Is tissue a element or compound

Answers

Answer:

compound

Explanation:

Perform the following operation
and express the answer in
scientific notation.
5.0x10-5 +2.0x10-4

Answers

Answer:

[tex]2.5[/tex] × [tex]10^{-4}[/tex]

Explanation:

[tex]5+10^{-5} + 2[/tex] × [tex]10^{-4} = 0.5[/tex] × [tex]10^{-4} + 2[/tex] × [tex]10^{-4}[/tex]

[tex]0.5[/tex] × [tex]10^{-4} + 2[/tex] × [tex]10^{-4}[/tex] = [tex]2.5[/tex] × [tex]10^{-4}[/tex]

In the provided issue, the scientific notation-expressed integers 5.0x10-5 and 2.0x10-4 are added, and the solution is 2.5x10^-4.

Thus, first transform the smaller integer to have the same exponent as the larger number in order to complete the addition. In this situation, by shifting the decimal point one position to the right, we rewrite 5.0x10-5 as 0.5x10-4.

The outcome of adding the numbers together is 2.5. Finally, we use the common exponent—in this example, -4—to express the result in scientific notation. The final solution is 2.5x10^-4 as a result. Therefore, by adjusting the exponent and adding the numbers, the final solution, 2.5x10^-4 is obtained.

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PLZZZ HURRY
Stuart designed and built a water filter in class. He wants to know if it will make water from lakes or streams safe to drink. Which of
the following would it be best for Stuart to measure in an experiment in order to test his design and answer this question?
А. the amount of time required for different volumes of water to pass through his filter
В. the diameter of the largest grain of dust, dirt, or sand that can pass through his filter
C. the amount of bacteria and impurities in water both before and after it passes through his filter
D. the maximum force that can be applied to his filter without breaking it

Answers

Answer:

c or d

Explanation:

C! The amount of bacteria and impurities in water both before and after it passes through his filter!

Explanation:

Although each of these properties of Stuart's filter may be worth testing, the one that will tell him whether his filter can make lake water safe to drink is the amount of bacteria, parasites, and impurities in water both before and after it passes through his filter. Some filters are good at removing impurities, but not bacteria. Other ways of purifying water may kill bacteria but not remove impurities.

Consider a Galvanic cell constructed from the following half cells, linked by a KCl salt bridge: an Fe electrode in 1.0 M FeCl2 solution and a Sn electrode in 1.0 M Sn(NO3)2 solution When the cell is running spontaneously, which choice includes only true statements and no false ones?a) The iron electrode gains mass and the iron electrode is the cathode.b) The tin electrode gains mass and the tin electrode is the cathode.c) The iron electrode gains mass and the iron electrode is the anode.d) The iron electrode loses mass and the iron electrode is the cathode.e) The tin electrode loses mass and the tin electrode is the cathode.

Answers

Answer:

b) The tin electrode gains mass and the tin electrode is the cathode.

Explanation:

Iron(ii) ion, Fe⁺ is higher than tin(ii) ion, Sn²⁺ in the electrochemical series, therefore, tin (ii) iron is preferentially discharged to iron(ii) ion in aqueous solutions.

Also, since oxidation occurs at the anode and reduction occurs at the cathode, in the Galvanic cell constructed from the following half cells, linked by a KCl salt bridge: an Fe electrode in 1.0 M FeCl2 solution and a Sn electrode in 1.0 M Sn(NO3)2 solution, the Fe electrode serves as the anode, while the Sn electrode serves as the cathode.

The Sn²⁺ ions in the aqueous solution of Sn(NO₃)₂ will accept electrons from the Sn cathode and become deposited as neutral Sn atoms. At the anode, neutral Fe atoms will dissolve into the FeCl₂ solution depositing their electrons at the anode, thereby losing mass.

Therefore the correct option is: (b) The tin electrode gains mass and the tin electrode is the cathode.

__________ are composed of two or more covalently bonded atoms.
a). elements
b)molecules

Answers

molecules is the answer i believe

An analytical chemist weighs out 0.281g of an unknown diprotic acid into a 250mL volumetric flask and dilutes to the mark with distilled water. He then titrates this solution with 0.0700M NaOH solution. When the titration reaches the equivalence point, the chemist finds he has added 48.3mL of NaOH solution. Calculate the molar mass of the unknown acid.

Answers

Answer:

166 g/mol

Explanation:

Step 1: Write the neutralization reaction

H₂A + 2 NaOH ⇒ Na₂A + 2 H₂O

Step 2: Calculate the reacting moles of NaOH

48.3 mL of 0.0700 M NaOH react.

0.0483 L × 0.0700 mol/L = 3.38 × 10⁻³ mol

Step 3: Calculate the reacting moles of H₂A

The molar ratio of H₂A to NaOH is 1:2. The reacting moles of H₂A are 1/2 × 3.38 × 10⁻³ mol = 1.69 × 10⁻³ mol.

Step 4: Calculate the molar mass of H₂A

1.69 × 10⁻³ moles of H₂A have a mass of 0.281 g. The molar mass of H₂A is:

M = 0.281 g / 1.69 × 10⁻³ mol = 166 g/mol

What is the main difference between vascular and nonvascular plants? the ability or inability to perform photosynthesis the presence or absence of xylem and phloem the ability or inability to perform cellular respiration the presence or absence of water

Answers

Answer:

Vascular plants are plants found on land that have lignified tissues for conducting water and minerals throughout the body of the plant. Non-vascular plants are plants mostly found in damp and moist areas and lack specialized vascular tissues. Vascular plants are also known as tracheophytes.

Explanation:

Answer:

The correct answer is B. The presence or absence of xylem and phloem.

Explanation:

I did this quiz. :)

How many molecules are in 3 grams of NO2?

Answers

Answer:

0.06520959450500399

Explanation:

Answer:

46.0055

Explanation:

what's the molecular geometry of SiCI4​

Answers

Answer:

Tetrahedral shape

Explanation:

The compound SiCl₄ has a molecular geometry of a tetrahedral shape. The shape of compound can be predicted using the valence shell electron pair repulsion theory model.

The total electron pair around the central atoms is 4. The number of bond pairs is 4. Lone pair is zero.

What is the importance of gametes?
A. They help to produce proteins for the cell.
B. They are created when a cell splits into two copies of itself.
C. They engage in binary fission.
D. They allow eukaryotes to reproduce.

Answers

Answer:

[tex]\boxed {\boxed {\sf D. \ They \ allow \ eukaryotes \ to \ reproduce}}[/tex]

Explanation:

Gametes are also called sex cells.

There are two types: the sperm (male) and egg (female). Gametes are haploid or contain half of the genetic information. When they unite and fertilize, they combine the two halves of the genome to create a diploid zygote that has one complete set of genetic information.

This process is known as sexual reproduction, the type of reproduction that eukaryotes (organism with cells containing a nucleus with DNA and membrane bound organelles) typically use.

So, based on the information we know above, the best answer choice is D. They allow eukaryotes to reproduce

True or False:
Carbon forms an incredible variety of substances
because it has eight valence electrons making it a
very stable atom that readily bonds.

Answers

Answer:

true i think but dont take my word for it.✌

According to the electronic configuration, carbon has 4 valence electrons that makes it a very stable atom that readily bonds.

What is electronic configuration?

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Write a chemical equation representing the second ionization energy for lithium. Use e− as the symbol for an electron.

Answers

Answer: Li^+ (g) ----> Li^2+ (g) + e^-

Considering the definition of first and second ionization energy, the second ionization energy of lithium is:

Li⁺ →  Li²⁺  +  1 e-

In first place, the electrons are attracted to the nucleus and it is necessary to provide energy to start them. Ionization energy is the energy required to remove an electron from a gaseous atom, isolated and in a ground state. The electrons in the last shell, which are the weakest attracted to the nucleus, are always lost. In this way the neutral atom becomes a gaseous cation (ion with a positive charge).

So, in this case, the first ionization energy of lithium is:

Li →  Li⁺  +  1 e-

The energy required to remove a second electron is called the second ionization energy and due to the difficulty of removing an electron from a positive particle, its value is greater than the first ionization energy (the volume of a positive ion is less than that of the neutral atom and the electrostatic force is greater in the positive ion than in the atom)

Finally, in this case, the second ionization energy of lithium is:

Li⁺ →  Li²⁺  +  1 e-

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