Which equation represents sublimation?1) $Hg_((l))\to Hg_((s))$
2) $NH_(3(g))\to NH_(3(l))$
3) $H_2O_((s)) \to H_2O_((g))$
4) $CH_(4(l)) \to CH_(4(g))$

Can someone help me with this one ?

Answers

Answer 1

Answer:

Answer is 3) - H₂O(s) → H₂O(g)

Sublimation can be defined as the type of phase conversion of a substance which is in its solid phase to a gaseous phase without going through its liquid phase.

According to the given choices only third one is correct because solid H₂O goes to its vapor without going liquid state.

Answer 2

Answer: Third one because sublimation is changing from solid to gas

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20 g of sugar is stirred into a beaker containing 100 g of water. After the sugar has completely dissolved, the solution is put on a scale. What is the mass of the solution?

Answers

The mass of the solution of sugar and water is 120 grams.

What is mass?

Mass is the quantity of matter of a physical body.

The mass of the sugar is given is 20g

The mass of the water is 100 g.

100 + 20 = 120 gram

Thus, the mass of the solution of sugar and water is 120 grams.

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The mass of the solution should be 120g since 20g of sugar were added to 100g and 100+20=120.
I hope this helps. Let me know in the comments if anything is unclear.

Molecules in all organisms are composed in part of radioactive carbon-14. Which statement best explains the presence of carbon-14 in organisms?a. The radioactive isotope reacts in the same way as stable isotopes in the nuclear reactions in the body.
b. The radioactive isotope reacts in the same way as stable isotopes in the chemical reactions in the body.
c. The radioactive isotope reacts faster than stable isotopes in the nuclear reactions in the body.
d. The radioactive isotope reacts faster than stable isotopes in the chemical reactions in the body.

Answers

I think the correct answer from the choices listed above would be option B. The statement that best describes the presence of carbon-14 in organisms would be that radioactive isotope reacts in the same way as stable isotopes in the chemical reactions in the body. This seems to be the most suitable answer since the other choices suggest that there are nuclear reactions in our system which is very far from the truth.

The statement that best explains the presence of carbon-14 in organisms is that the radioactive isotope reacts in the same way as stable isotopes in the chemicalreactions in the body. That is option B.

What is radioactive carbon-14?

Radioactive carbon-14 is a type of radioactive element that is present in the air which is assimilated in small quantities into the body during metabolism( chemical reaction of the body).

The radioactive carbon-14. can be used in a process called carbon dating because it reacts the same way as stable isotopes in their chemical reactions in the body.

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Enter the molecular formula for butane, C4H10.
express in a chemical formula

Answers

Answer: the molecular formula is C₄H₁₀

You can also express it as: CH₃ - CH₂ - CH₂ - CH₃.

Explanation:

1) The molecular formula is the chemical formula for a covalent compound. It shows the elements present in one molecule of the compound: type of atoms and the number of each.

The number of each type of atoms is indicated by the subscript to the right of the symbol.

2) Butane is the alkane with 4 carbon atoms.

3) The general formula for the alkanes is CₓH₂ₓ₊₂, meaning thar for x atoms of C there are 2x+2 atoms of H. Therefore, for 4 C atoms there are 2(4)+2 = 8 + 2 = 10 H atoms.

That is why the molecular formula of butane is C₄H₁₀, meaning that each molecule of this alkane has 4 atoms of carbon and 10 atoms of hydrogen.

The other expression: CH₃ - CH₂ - CH₂ - CH₃, shows that this compounds is a chain, in which each C has 4 bonds, one with other C atom to the right, one with other C atom to the right and the difference (2 or 3) with H atoms.

The molecular formula of butane is $\boxed{{{\text{C}}_{\text{4}}}{{\text{H}}_{{\text{10}}}}}$ .

Further explanation:

The molecular formula is a chemical formula that depicts the total number and kinds of atoms present in a molecule. For example, molecular formula of carbon dioxide is ${\text{C}}{{\text{O}}_2}$ .

Hydrocarbon is a term for the organic compounds that consist of hydrogen and carbon only.

Types of hydrocarbons:

1. Saturated hydrocarbons

The simplest hydrocarbons that are composed of only single bonds are called saturated hydrocarbons. These hydrocarbons have the general formula of ${{\text{C}}_n}{{\text{H}}_(2n + 2)}$ , where n is the number of carbon atoms. These hydrocarbons have suffix “ane” in their names. Examples of such hydrocarbons are methane, hexane, and propane.

2. Unsaturated hydrocarbons

These have one or more multiple bonds in them. These hydrocarbons have suffix “ene” or “yne”, depending on whether there is a double or triple bond between them. Hydrocarbons comprising of double bonds are called alkenes and those having triple bonds are called alkynes.

The name of butane includes the suffix “ane”. This implies it is a saturated hydrocarbon and contains only single bonds in it. The prefix “but” indicates the presence of four carbon atoms in this molecule.

Substitute 4 for n in the general formula of alkane $\left( {{{\text{C}}_n}{{\text{H}}_(2n + 2)}} \right)$ to find out the formula of butane.

$\begin{aligned}{\text{Molecular formula of butane}} &= {{\text{C}}_{\text{4}}}{{\text{H}}_{\left( {{\text{2}}\left( {\text{4}} \right){\text{ + 2}}} \right)}}\n&= {{\text{C}}_4}{{\text{H}}_(10)}\n\end{aligned}$

Learn more:

Calculate the moles of ions in the solution: brainly.com/question/5950133
Calculate the moles of chlorine in 8 moles of carbon tetrachloride: brainly.com/question/3064603

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Stoichiometry of formulas and equations

Keywords: molecular formula, butane, C4H10, 4, ane, ene, yne, alkane, alkyne, alkene, saturated hydrocarbon, unsaturated hydrocarbon.

A student requires 2.00 L of 0.100 M NH4NO3 from a 1.75 M NH4NO3 stock solution. What is the correct way to get the solution?

Answers

To solve this we use the equation,

M1V1 = M2V2

where M1 is the concentration of the stock solution, V1 is the volume of the stock solution, M2 is the concentration of the new solution and V2 is its volume.

1.75 M x V1 = 0.100 M x 2.0 L

V1 = -.11 L

Answer : The volume of $NH_4NO_3$ stock solution is, 0.114 L

Solution :

According to the dilution law,

$M_1V_1=M_2V_2$

where,

$M_1$ = molarity of $NH_4NO_3$ solution = 0.100 M

$V_1$ = volume of $NH_4NO_3$ solution = 2.00 L

$M_2$ = molarity of $NH_4NO_3$ stock solution = 1.75 M

$V_2$ = volume of $NH_4NO_3$ stock solution = ?

Now put all the given values in the above law, we get the volume of $NH_4NO_3$ stock solution.

$(0.100M)* (2.00L)=(1.75M)* V_2$

$V_2=0.114L$

Therefore, the volume of $NH_4NO_3$ stock solution is, 0.114 L

What is true about blood alcohol concentration?

Answers

Blood alcohol concentration is the most commonly used measurement for alcohol intoxication for legal or medical purposes. It measures the amount of alcohol in the bloodstream. It is expressed in percent alcohol in blood. Hope this answers the question. Have a nice day.

What two factors determine the thermal energy in a substance