Please answer ASAP on a timed exam

the molarity of a solution made by dissolving 5.67 g of potassium chloride in enough water to make 100.0 mL of solution.

Because this is a double replacement reaction, the iron and potassium will swap places, giving [tex]\text{K}_{2}\text{Cl}_{2}[/tex] and [tex]\text{FeS}[/tex].

The names of these compounds are potassium chloride and Iron(II) sulfide

Explanation:

Oxidation state of Nitrogen in N2O5 is +5

Answer:

a. 480 kilojoules

Explanation:

good luck have a nice day

On increasing temperature , On decreasing pressure , on increasing the number of air molecules in the balloon volume will increase

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases.

An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Considering the gas inside the balloon to be ideal

We can understand from the ideal gas equation that

V∝ Temperature

V∝ Number of air molecules

V ∝ (1/P)

Therefore on increasing temperature volume will increase ,

On decreasing pressure volume will increase

and on increasing the number of air molecules in the balloon volume will increase.

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Answer:

3 Ca(OH)2 + 2 K3PO4 ---> Ca3(PO4)2 + 6 KOH

Explanation:

Just balance each atom on both sides.

Answer:

Up

Explanation:

Let's balance

Moles of laughing gas

2 moles need 3 mol O_2

1 mol needs= 1.5mol O_2

moles of O_2.

#2

Moles Of O_2

Moles of smog

Mass

2N₂O + 3O₂ ⇒ 4NO₂

mol N₂O = 9 g : 44 g/mol = 0.205

mol O₂ = 3/2 x 0.205 = 0.3075

mass O₂ = 0.3075 x 32 g/mol = 9.84 g

=================================

mol O₂ = 7.5 g : 32 g/mol = 0.234

mol NO₂ (smog) = 4/3 x 0.234 = 0.312

mass NO₂ = 0.312 x 46 g/mol = 14.352 g

Answer: an exothermic reaction in which entropy increases

Explanation:

Spontaneous reactions normally cause an increase in entropy and are also exothermic.

The number of molecules of sugar, C₁₂H₂₂O₁₁ you ingest given the data is 6.86×10²² molecules

1 mole of C₁₂H₂₂O₁₁ = 6.02×10²³ molecules

But

1 mole of C₁₂H₂₂O₁₁ = 342 g

Thus,

342 g of C₁₂H₂₂O₁₁ = 6.02×10²³ molecules

342 g of C₁₂H₂₂O₁₁ = 6.02×10²³ molecules

Therefore,

39 g of C₁₂H₂₂O₁₁ = (39 × 6.02×10²³) / 342

39 g of C₁₂H₂₂O₁₁ = 6.86×10²² molecules

Thus, 6.86×10²² molecules are present in 39 g of sugar, C₁₂H₂₂O₁₁

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Answer:

True

Explanation:

Vocal folds vibrate when excited by aerodynamic phenomena; they are not plucked like a guitar string. Air pressure from the lungs controls the open phase. The passing air column creates a trailing “Bernoulli effect,” which controls the close phase.

Answer:

yes

Explanation:

well for some people because some times u can control your voice and sometimes u just get voice cracks

Answer:

431536.9mL

Explanation:

Answer:

15 L water at 25℃

Explanation:

Answer:

15 L water at 25°C

Question: As the temperature of a substance increases, the average kinetic energy of the particles in the substance

Answer: increases

Explanation:

Answer:

27) Double replacement

28) 2NaOH + H2SO4 --> Na2SO4 + 2H2O

Answer:

Clay

Explanation:

Since Clay has a very small particle size it compacts or has a high surface area which slows the path of water, holding it for longer periods compared to other soil components.

Answer:

A month

Explanation:

Answer:

Science is all about learning and understanding something new. Inquiry means to ask for information or investigate something to find out more. So, scientific inquiry is using evidence from observations and investigations to create logical explanations and answer questions.

This is a good answer:

Darmstadtium based on its position in the periodic table, proposes three different reasonable valence electron configurations for this element is 2.

​

Darmstadtium was first synthesized by research scientists at the Heavy Ion Research Laboratory in Darmstadt, Germany in 1994. The element was made by bombarding lead-208 atoms with nickel-62 atoms in a heavy-ion accelerator. Four atoms of darmstadtium were produced in the first experiment.

Darmstadtium is a chemical element with the symbol Ds and atomic number 110.

It is an extremely radioactive synthetic element.

Darmstadtium based on its position in the periodic table, proposes three different reasonable valence electron configurations for this element is 2.

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Answer: 0.052moles

Explanation:

number of moles = given mass (g) / molar mass(g/mol)

n=m/M

n= 5.2g/ (40 + 12 + 48)g/mole

n=5.2g/100g/mol

n=0.052 moles

Answer: 10.8 mol

Explanation:

The balanced equation in the image represents the reaction where aluminum chloride is formed from its elements.

From this equation, we know that for every 2 moles of aluminum consumed, 2 moles of aluminum chloride are produced (we can reduce this to conclude that moles of aluminum consumed = moles of aluminum chloride produced)

This means the answer is 10.8 mol.

Answer:

metallic is the correct one

Explanation:

Any metal such as iron are usually hard

Metallic type of solid is usually the hardest. Option D is correct.

A metal is a solid which is hard in nature shiny and smooth and produce sound when collide with each use to make ornaments, utensils or big machines etc. as there are different metals and hard too.

Some examples are gold, silver, copper, platinum, steel etc. they all are good conductor of electricity mostly copper is used to make wires and steel for making buildings etc. because of strong molecular force they are hard.

Therefore, Metallic type of solid is usually the hardest. Option D is correct.

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Answer:

0.409 mol

Explanation:

The formula to find he number of moles is:

No. of moles = [tex]\frac{mass}{Mr}[/tex]

Mr of MgBr₂ = 24.3 + (79.9 × 2) = 184.1

Mass = 75.25g

So, no. of moles = [tex]\frac{75.24}{184.1}[/tex]

No. of moles = 0.409 mol [to 3 significant figures]

Answer:

8,400

Explanation:

multiply 8.4kg by 1000

Answer:

8400g

Explanation:

1kg=1000g

8.4*1000g=8400kg

To Find:-

Grams Present in 3.45 Moles of Carbon.

We Know:-

Molecular Mass of Carbon Dioxide= 44.01 grams/mol or 44 grams/mol

[tex] \text{Moles} = \frac{\text{Mass}}{\text{Molecular mass}}[/tex]

[tex] \implies 3.45 \text{moles} = \frac{ \text{Mass}}{44 \text{g/mol}} \\ \\ \implies \text{Mass} = {44 \text{g/mol}} \times 3.45 \text{moles} \\ \\ \implies \text{Mass} = {44 \text{g/} \cancel\text{ mol}} \times 3.45 \cancel\text{moles} \\ \\ \implies \text{Mass} = 44 \text{g} \times 3.45 \\ \\ \implies \text{Mass} = \red{151.8 \text{g}}[/tex]

[tex]\therefore \text{Mass of 3.45 Moles of Carbon Dioxide is = \red{151.8g}}[/tex]

Precipitate forms when you add 32.5 g of NaCl to 131.0 mL of 0.29 M [tex]Pb(NO_3)_2[/tex]

The solubility product constant, Ksp​, is the equilibrium constant for a solid substance dissolving in an aqueous solution.

Writing the equation:

NaCl → [tex]Na^+[/tex]  + [tex]Cl^-[/tex]

[tex]Pb(NO_3)_2[/tex] → [tex]Pb^2^+[/tex]  + [tex]2NO^3^-[/tex]

[tex]Pb^2^+[/tex] + 2[tex]Cl^-[/tex] ↔ [tex]PbCl_2[/tex]

I.P = [ [tex]Pb^2^+[/tex]] * [ [tex]Cl^-[/tex] ]

Ksp [tex]PbCl_2[/tex] =[ [tex]Cl^-[/tex] ] * [[tex]Pb^2^+[/tex] ]

1.7 x [tex]10^-^5[/tex]= [ [tex]Cl^-[/tex] ] * [ [tex]Pb^2^+[/tex] ]

Molarity of NaCl = 4.24 M

Molarity of [tex]Pb(NO_3)_2[/tex] = 0.29 M

Ksp [tex]PbCl_2[/tex] =[ Cl- ] * [[tex]Pb^2^+[/tex] ]

Ksp << IP ⇒ precipitate formation will not take place.

Hence, the precipitate formation will not take place.

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Answer:

Think it's C16H31FN2O2, but I couldn't find anything else about it.

Explanation:

It's an organic chemistry skeletal structure and it's very difficult to explain how to read. Hopefully this gave you a push in the right direction, I know it wasn't the most complete answer.