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

Answer:

maybe try to do something with electricity?

Explanation:

give me an update on when u find one :) cant wait to see it

Answer:

B

Explanation:

Answer:

[Ne] 3s² 3p¹

Explanation:

Answer: One of the foods was sour and one was sweet

Explanation:

The sweet one has changed because it has more sugar then the sour one, It either got moldy or melted.

Answer:

C

Explanation:

CO2 is a molecule because it is compose of atoms which made it a molecule, it can also be call a compound.

Answer:

I believe it is c. Molecule, Pure compound

Explanation:

this is because it is composed of atoms which create molecule.

Answer:

-7.6755

Explanation:

Calculate

I calculate it

Answer:

4.2x10⁻⁴ M or 0.032 g/L.

Explanation:

Hello!

In this case, for solubility product problems, we apply the concepts of equilibrium because an insoluble salt is ionized until a certain point limited by the solubility product constant, Ksp. Thus, we first write the ionization reaction of aluminum hydroxide at equilibrium:

[tex]Al(OH)_3(s)\rightleftharpoons Al^{3+}(aq)+3OH^-(aq)[/tex]

Next, we write the corresponding equilibrium expression:

[tex]Ksp=[Al^{3+}][OH^-]^3[/tex]

Which in terms of [tex]x[/tex], the reaction extent, is:

[tex]Ksp=x*(3x)^3[/tex]

Because [tex]x[/tex] also represents the molar solubility of aluminum hydroxide at the considered temperature; now, we can write:

[tex]8.1x10^{-13}=x*(3x)^3[/tex]

Which can be solved for x as follows:

[tex]x=\sqrt[4]{\frac{8.1x10^{-13}}{27} } \\\\x=4.2x10^{-4}M[/tex]

Thus, the solubility is 4.2x10⁻⁴ M or mol/L and in g/L we have:

[tex]4.2x10^{-4}\frac{mol}{L}*\frac{78g}{1mol} =0.032\frac{g}{L}[/tex]

Best regards!

Answer:

Propionic acid reacts with NaOH(aq) to form sodium propionate and water.

Explanation:

.

Answer:

". It will mark the time since humans began altering Earth. Starting about 10,000 years ago, it is tentatively being called the Anthropocene."

i dont know if tht will help

100,000 years in the geologic history of Earth would be considered

as Anthropocene .

The first and most recent geological epoch in Earth's history when human life began to have a noticeable influence on the planet's climate, including ecosystems, and ecosystems, is referred to as the Anthropocene Epoch. This term refers to an undefined unit of geologic time.

It would be the first time since people started changing the planet. It must be tentatively referred to as the Anthropocene and began around 10,000 years ago.

To know more about Anthropocene

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Answer:

λ = 5.68×10⁻⁷ m

Explanation:

Given data:

Energy of photon = 3.50 ×10⁻¹⁹ J

Wavelength of photon = ?

Solution:

E = hc/λ

h = planck's constant = 6.63×10⁻³⁴ Js

c = 3×10⁸ m/s

Now we will put the values in formula.

3.50 ×10⁻¹⁹ J =  6.63×10⁻³⁴ Js × 3×10⁸ m/s/ λ

λ =  6.63×10⁻³⁴ Js × 3×10⁸ m/s / 3.50 ×10⁻¹⁹ J

λ =  19.89×10⁻²⁶ J.m / 3.50 ×10⁻¹⁹ J

λ = 5.68×10⁻⁷ m

Answer:

I think that gravity can be considered a force.

Explanation:

As the object falls, it moves faster and faster. Gravity is considered a universal force because it acts between any two masses anywhere in the universe. For example, there is a gravitational pull between the Sun and the Moon. Even small masses attract one another.

Hope this helped! :)

Answer:

a. 100%

b. 133%

c. 300%

Explanation:

To find yield first we need to determine theoretical yield converting each reactant to moles and find limitng reactant for each reaction:

Moles A:

4.5g * (1mol / 150g) = 0.03 moles

Moles B:

4.0g * (1mol / 100g) = 0.04 moles

a. For a complete reaction of 0.03 moles of A are needed:

0.03 moles A * (1 mole B / 3 moles A) = 0.01 moles of B

As there are 0.04 moles of B, A is limiting reactant.

Theoretical moles and mass of C are:

0.03 moles A * (1 mole C / 3 moles A) = 0.01 moles of C.

0.01 moles of C * (200g / mol) = 2g are produced.

Yield is:

2g / 2g * 100 = 100%

b. For a complete reaction of 0.03 moles of A are needed:

0.03 moles A * (3 mole B / 2 moles A) = 0.045 moles of B

As there are 0.04 moles of B, B is limiting reactant.

Theoretical moles and mass of C are:

0.04 moles B * (1 mole C / 3 moles B) = 0.0133 moles of C.

0.0133 moles of C * (200g / mol) = 2.67g are produced.

Yield is:

2.67g / 2g * 100 = 133%

c. For a complete reaction of 0.03 moles of A are needed:

0.03 moles A * (1 mole B / 1 moles A) = 0.03 moles of B

As there are 0.04 moles of B, A is limiting reactant.

Theoretical moles and mass of C are:

0.03 moles A * (1 mole C / 1 moles A) = 0.03 moles of C.

0.03 moles of C * (200g / mol) = 6g are produced.

Yield is:

6g / 2g * 100 = 300%

Answer:Robert Oppenheimer went on to become chairman of the General Advisory Committee of the Atomic Energy Commission, which, in October 1949, opposed the development of the hydrogen bomb. This shocking opposition led to accusations that Oppenheimer was a Communist supporter.

Explanation:

Answer:

action, reaction

Explanation:

Answer:

for every action there is an equal and opposite reaction

Answer:

this is not chemistry

Explanation:

not chemistry

Answer:

1.1 × 10⁻⁶ M

Explanation:

Step 1: Given and required data

Step 2: Write the balanced equation for the solution reaction of calcium oxalate

CaC₂O₄(s) ⇄ Ca²⁺(aq) + C₂O₄²⁻(aq)

Step 3: Calculate the concentration of the oxalate ion to begin the precipitation of calcium oxalate

We will use the Ksp of calcium oxalate.

Ksp = 2.7 × 10⁻⁹ = [Ca²⁺].[C₂O₄²⁻]

[C₂O₄²⁻] = Ksp / [Ca²⁺]

[C₂O₄²⁻] = 2.7 × 10⁻⁹ / 2.5 × 10⁻³

[C₂O₄²⁻] = 1.1 × 10⁻⁶ M

Kidney stones are the calcareous stones formed in the kidney of the excretory system. The initial concentration of oxalate ion was [tex]1.1 \times 10^{-6} \;\rm M.[/tex]

Concentration is the amount of the substance present in the sample and can be calculated by the solubility constant of the products.

Given,

Concentration of calcium = 2.5mM

The solubility product constant = [tex]2.7 \times 10^{-9}[/tex]

The balanced chemical reaction for calcium oxalate can be written as:

[tex]\rm CaC_{2}O_{4}(s) \leftrightharpoons Ca^{2+}(aq) + C_{2}O_{4}^{2-}(aq)[/tex]

The concentration of oxalate ions by Ksp is calculated as:

[tex]\begin{aligned} [C_{2}O_{4}^{2-}] &= \rm \dfrac {Ksp}{[Ca^{2+}]}\\\\&= \dfrac{2.7 \times 10^{-9}}{2.5 \times 10^{-3}}\\\\&= 1.1 \times 10^{-6}\;\rm M\end{aligned}[/tex]

Therefore, [tex]1.1 \times 10^{-6} \;\rm M[/tex] is the concentration of oxalate ion.

Learn more about concentration here:

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Answer:

so here is the answer

Explanation:

Kinetic is the answer.

Answer:

Explanation:

29.4 mL of nitric acid having molarity of .187M reacts with 22.7 mL of potassium hydroxide .

moles contained in nitric acid solution

= .0294 x .187 moles

= 5.5 x 10⁻³ moles

This must have been reacted with same amount of moles of base

moles of sodium hydroxide in 22.7 mL of solution = 5.5 x 10⁻³ moles

molarity of base solution = 5.5 x 10⁻³ / 22.7 x 10⁻³

= .24 M .

Answer:

a. the lithosphere

Explanation:

google

Answer:

[tex][Cu^{2+}]=0.041 M[/tex]

Explanation:

Hello!

In this case, since the molarity of a solution is defined in terms of the moles of the solute and the volume of solution, given that the concentration of Cu(NH₃)₄²⁺ is 0.041 M, and there is only one copper atom per Cu(NH₃)₄²⁺ ion, we can compute the concentration of Cu²⁺ as shown below:

[tex][Cu^{2+}]=0.041\frac{molCu(NH_3)_4^{2+}}{L}*\frac{1molCu^{2+}}{1molCu(NH_3)_4^{2+}} =0.041 \frac{molCu(NH_3)_4^{2+}}{L}[/tex]

[tex][Cu^{2+}]=0.041 M[/tex]

Best regards!

Answer:

N = 5.8 × 10²⁴ molecules

Explanation:

Step 1: Given and required data

Step 2: Calculate the number of molecules (N) in 9.6 moles of C₂H₄

To convert moles to molecules we need Avogadro's number: there are 6.02 × 10²³ molecules of C₂H₄ per mole of C₂H₄

N = n × NA

N = 9.6 mol × 6.02 × 10²³ molecules/mol

N = 5.8 × 10²⁴ molecules

Answer: multiple approaches yield the same result positively contributes to the development of a theory since it shows that the conclusions are sound and not based on other factors such as the environment of the experiment, the researches, etc.

Answer:

I'm not positive this is the answer but my guess  would be C: Evidence from multiple approaches might prevent a poorly developed theory from being accepted.

The pascal is sorthand for N/m^2

Answer:

Metal, Copper, and Alluminum

Explanation: It is what it is

Answer:

3

Explanation:

Answer:

I'm not an expert at this, but I assume its mercury.

Answer:

urorrr

Explanation:

hahhahahahahhaahah oki nam omy mymy mymy

Answer:

Explanation:

Chemicals to produce NH₃ ( ammonia )

1 ) Ammonium chloride ( NH₄Cl )

2 ) Calcium hydroxide  Ca(OH)₂

2NH₄Cl + Ca(OH)₂ = CaCl₂ + 2NH₃ + 2H₂O.

Net Ionic equation

2NH₄⁺ ( aq ) + 2OH⁻ (aq )  = 2NH₃(g)  + 2H₂O .