Unit 4.2 quiz chemistry

Answer:

oof this is way to hard sry man

Explanation:

Answer:

No

Explanation:

AgNO₃ + KCl --> AgCl + KNO₃

This reaction is a precipitation reaction. AgCl is formed as a white solid due to its low solubility in water.

Answer: radio wave frequencies have longer wavelengths and smaller

Energies per photon

Answer:

The forest products industry plays a major role in the Swedish economy, and accounts for between nine and 12 percent of Swedish industry's total employment, exports, sales and added value. It includes companies within the pulp and paper industry, as well as the wood-mechanical industry.

Answer:

here

Explanation:

Answer: 4

A molecule of carbon tetrafluoride, CF4 , is made up of 1 carbon atom bonded to 4 fluorine atoms. Each carbon atom weighs 12.0 amu and each fluorine atom weighs 19.0 amu so 1 CF4 molecule weighs 1×12.0 amu + 4×19.0 amu = 88.0 amu. This number, 88.0, is called the molecular weight (or molecular mass) of CF4.

Explanation:

The general equation for an endothermic reaction is: Reactants + Energy → Products.

Hope it helps :)❤

The equation represents an endothermic reaction is reactants + energy

products.

Endothermic reactions are chemical reactions in which the reactants soak up warm strength from the surroundings to form products.

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Answer:

A). Lewis Acid

Explanation:

deez

The term that best describes the compound that accepts electrons from another substance to form a covalent bond is Lewis acid.

Lewis acid is a compound or ionic species which can accept an electron pair from a donor compound while a Lewis base is a compound such as the OH- ion, that can donate a pair of non-bonding electrons.

According to this question, a compound accepts electrons from another substance to form a covalent bond.

Therefore, the term that best describes the compound that accepts electrons from another substance to form a covalent bond is Lewis acid.

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Answer:

The pH of a solution is a measure of the concentration of hydrogen ions in the solution. A solution with a high number of hydrogen ions is acidic and has a low pH value. A solution with a high number of hydroxide ions is basic and has a high pH value. The pH scale ranges from 0 to 14, with a pH of 7 being neutral.

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Answer: I think it is hydroxide ion but im not sure

Explanation:

I hope this helped!

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Answer: The total pressure is 7 atm

Explanation:

According to Dalton's law, the total pressure is the sum of individual pressures.

[tex]p_{total}=p_A+p_B+p_C...[/tex]

Given : [tex]p_{total}[/tex] =total pressure of gases = ?

[tex]p_{O_2}[/tex] = partial pressure of oxygen = 2 atm

[tex]p_{N_2}[/tex] = partial pressure of nitrogen = 4 atm

[tex]p_{Ar}[/tex] = partial pressure of argon = 1 atm

putting in the values we get:

[tex]p_{total}=2atm+4atm+1atm[/tex]  

[tex]p_{total}=7atm[/tex]

Thus the total pressure is 7 atm

Answer:

oop I'm thinking hmmmmm

Answer:

Explanation:

The main assignment here is to provide the structure of A. But before that, let us explain briefly some certain things:

The proton NMR (1H) gives data about the quantity of non-identical protons present in the structure. The resonance frequency is seen regarding the standard compound (0 ppm), which is addressed as a chemical shift. The same protons have equal value of chemical shift.

The protons that are available in a similar environment are addressed as comparable protons and the protons with various conditions are called non-identical protons.

However, from the image below, we can see the reaction of the compound 1,3,5,7-cyclooctatetraene resulting in 2 equivalents of potassium forming an aromatic dianion.

Answer:In the LATER stages of development they would have a spine

Explanation:

Answer:

benzoic acid: pka = 4.19

Explanation:

Divide the volume of water with mass of salt and multiply with 100 you'll get the concentration percentage

answer is B, because solution A's percentage is 10%

brainliest plz

Answer:

C. Hydrogen bonds​

Explanation:

Strongest intermolecular force

Hydrogen Bonding (H-Bonding)

Hydrogen bonds are caused by highly electronegative atoms. They only occur between hydrogen and oxygen, fluorine or nitrogen, and are the strongest intermolecular force.

Answer: C hydrogen bonds

Explanation:

Answer:

60.86 g of PH₃

Explanation:

We'll begin by calculating the number of mole of H₂ that will occupy 60 L. This can be obtained as follow:

22.4 L = 1 mole of H₂

Therefore,

60 L = 60 / 22.4

60 L = 2.68 mole of H₂.

Next, we shall determine the number of mole of PH₃ produced by the reaction of 60 L (i.e 2.68 mole) of H₂. This can be obtained as follow:

P₄ + 6H₂ –> 4PH₃

From the balanced equation above,

6 moles of H₂ reacted to produce 4 moles of PH₃.

Therefore, 2.68 moles of H₂ will react to to produce = (2.68 × 4)/6 = 1.79 moles of PH₃.

Finally, we shall determine the mass of 1.79 moles of PH₃. This can be obtained as follow:

Mole of PH₃ = 1.79 moles

Molar mass of PH₃ = 31 + (3×1)

= 31 + 3 = 34 g/mol

Mass of PH₃ =?

Mass = mole × molar mass

Mass of PH₃ = 1.79 × 34

Mass of PH₃ = 60.86 g

Thus, 60.86 g of PH₃ were obtained from the reaction.

Answer:

Gill Slits

Explanation:

For the one who asked what hind limbs are they are back legs :)

Answer:

215 moles

Explanation:

[tex]9.6mol CO_{2} (\frac{22.4 L CO_{2}}{1 mol CO_{2}} ) = 215 L CO_{2}[/tex]

On CK-12 all of these answers are correct

1.9

1.888

1.89

1.88

The molality of a 10.0 % by mass solution of sodium chloride (NaCl) is 1.7M.

Molarity of any solution will be calculated as number of moles of solutes present in per litre of the solution.

Moles of the substance will be calculated as:

n = W/M, where

W = given mass

M = molar mass

Given that percent mass of NaCl = 10% i.e. 10g of NaCl is present in 100 g of solution.

We know that 1 g = 0.001 L

100 g = 0.1 L

Moles of NaCl = 10g / 58.44g/mol = 0.17 mol

Molarity of NaCl = 0.17 / 0.1 = 1.7M

Hence required molarity is 1.7 M.

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Answer:

Transform = The third one

Convergent  = the first one

Divergent = the second one

Explanation:

Answer:

1 mole = 28.0101

Hence,

82.4 = around 2.8 mole

Have a great day <3

I think it would be d bc water is everywhere

Answer:

Explanation:

The standard molar mass is:

For (S )-1-chloro-4-ethyl-2-methylhexane = 162.5 g/mol

For triphenylphosphine  = 262 g/mol

For  ( S )-1-chloro-4-ethyl-2-methyl triphenylphosphonium = 424.5 g/mol

The mass required for 81% yield = [tex]\dfrac{81}{100} \times Theoretical \ yield = 4.15 g[/tex]

Theoretical yield = [tex]\dfrac{4.15}{0.81}[/tex]

= 5.1235 g

thus, since 424.5 g yield produce from 162.5 g

∴

5.1235 g yield will produce = [tex]\dfrac{162.5}{424.5}\times 5.1235 \ g[/tex]

= 1.9613 g of alkyl halide (-chloro) required.

Also, since 424.5 g yield produce from 262 g phosphine

∴

5.1235 g yield will produce = [tex]\dfrac{262}{424.5}\times 5.1235 \ g[/tex]

= 3.1622 g of triphenylphosphine required.

Answer:

Solid

Explanation:

Molecules in solids only vibrate in place, while the other two have moving molecules