How many identical double strands of DNA will be present after three rounds of replication?four
six
eight
nine

Answers

Answer 1

Answer:

Answer:

eight

Explanation:

In the first stage of DNA replication each DNA molecule replicates into two daughter DNA. In the second stage of DNA replication each of the two daughter DNA molecule replicates into two daughter DNA, thus forming a total of four DNA molecules. In the third stage of DNA replication each of the four daughter DNA molecule replicates into two daughter DNA, thus forming a total of eight DNA molecules.

Answer 2

Answer: Every time you replicate DNA you get 2 new DNA and 1 strand of each DNA is composed of the parent strand. So after 3 rounds of replication....
1 --> 2 ---> 4 ---> 8
Out of these 8, 2 of them contain the parent strands. So 2/8 = 1/4 = 25%

Thus the answer is the third option, eight (8).

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A balance is used to determine: my answer is a weight mass gravity

Answers

Answer: A balance is used to determine accurate mass of substances.

Explanation: Electronic balance is used to measure the small to large mass of substance from miligrams to grams to kilograms according to their features. Differnt different Electronic balances are used on the basis of amount to be measure.

In pharmaceuticals , other laboratories , schools , colleges mainly electronic balance is used , as it measure accurate weight of the substances.

a balance is used to determine Mass

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.

What is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid?

Answers

the theoretical yield of hydrogen gas is 10 g

calculation

Step 1: write the equation for reaction

Zn + 2 HCl → zncl₂ + H₂

Step 2: use the mole ratio to find the moles of H₂

from equation above Zn : H₂ is 1: 1 therefore the moles of H₂ = 5.00 moles

Step 3: find the theoretical yield(mass) for H₂

mass = moles × molar mass

from periodic table the molar mass of H₂= 1×2 = 2 g/mol

mass = 5 moles × 2 g/mol = 10 grams

Answer:

B. 10.1 g

Explanation:

A 2.00 g sample of ammonia is mixed with 4.00 g of oxygen. Which is thelimiting reactant and how much excess reactant remains after the reaction
has stopped?

Answers

Answer:

Ammonia is limiting reactant

Amount of oxygen left = 0.035 mol

Explanation:

Given data:

Masa of ammonia = 2.00 g

Mass of oxygen = 4.00 g

Which is limiting reactant = ?

Excess reactant's amount left = ?

Solution:

Balance chemical equation:

4NH₃ + 3O₂ → 2N₂ + 6H₂O

Number of moles of ammonia:

Number of moles = mass/molar mass

Number of moles = 2.00 g/ 17 g/mol

Number of moles = 0.12 mol

Number of moles of oxygen:

Number of moles = mass/molar mass

Number of moles = 4.00 g/ 32 g/mol

Number of moles = 0.125 mol

Now we will compare the moles of ammonia and oxygen with water and nitrogen.

NH₃ : N₂

4 : 2

0.12 : 2/4×0.12 = 0.06

NH₃ : H₂O

4 : 6

0.12 : 6/4×0.12 = 0.18

O₂ : N₂

3 : 2

0.125 : 2/3×0.125 = 0.08

O₂ : H₂O

3 : 6

0.125 : 6/3×0.125 = 0.25

The number of moles of water and nitrogen formed by ammonia are less thus ammonia will be limiting reactant.

Amount of oxygen left:

NH₃ : O₂

4 : 3

0.12 : 3/4×0.12= 0.09

Amount of oxygen react = 0.09 mol

Amount of oxygen left = 0.125 - 0.09 = 0.035 mol

Final answer:

The limiting reactant in the reaction between Ammonia and Oxygen is Ammonia (NH3). All of the Oxygen is used up in the reaction, so no excess reactant remains.

Explanation:

This question involves a concept in chemistry known as limiting reactants and stoichiometry. The balanced chemical reaction between Ammonia (NH3) and Oxygen (O2) is: 4NH3 + 5O2 -> 4NO + 6H2O. This indicates that 4 moles of NH3 react with 5 moles of O2.

To find the limiting reactant, you first need to convert the grams of your reactants to moles. The molar mass of NH3 is approximately 17.0g/mol, and the molar mass of O2 is 32.0g/mol. Therefore, you have 2.00g/17.0g/mol = 0.118 moles of NH3 and 4.00g/32.0g/mol = 0.125 moles of O2.

Since 5 moles of O2 are needed for every 4 moles of NH3, and we have slightly more O2 than NH3, the limiting reactant is NH3. To find the amount of excess reactant, we determine how much O2 actually reacted by multiplying (0.118 moles NH3)*(5 moles O2/4 moles NH3) = 0.1475 moles O2. The original amount of O2 was 0.125 moles, so the amount left over is 0.125 - 0.1475, which is a negative number and thus not possible. This confirms that O2 is the excess reactant, although it entirely reacted. Hence, no excess reactant remains.

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Nuclear fusion differs from nuclear fission because nuclear fusion reactions(1) form heavier isotopes from lighter isotopes
(2) form lighter isotopes from heavier isotopes
(3) convert mass to energy
(4) convert energy to mass

Answers

Nuclear fusion is the forceful collision of two nuclei to make a larger one
So the answer is (1)
(2) Would be nuclear fission
For (3) and (4), you can't convert energy from anything that isn't another form of energy, and you can't convert it in to anything that isn't another from of energy

Nuclear fusion differs from nuclear fission because nuclear fusion reactions. Nuclear fusion forms heavier isotopes from lighter isotopes. Nuclear fission forms lighter isotopes from heavier isotopes. therefore, the correct options are option 1,2.

Nuclear fission gets a nuclear process in which the atom's nucleus is divided into smaller nuclei by being blasted with low-energy neutrons. In this process, a large quantity of energy is released. Nuclear fission processes are employed for nuclear power reactors due to their simplicity and high energy output. When multiple atoms unite to produce one heavier nucleus, the process is known as nuclear fusion. In comparison to the energy produced throughout the nuclear fission reaction, a tremendous quantity of energy is released during this process.

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Sulfur dioxide is a main component of: photochemical smog, thermal inversion, industrial smog.

Answers

Answer: industrial smog.

Explanation:

The industrial smog typically exists in the urban industrial areas where the large scale burning of the fossil fuels may lead to generation of huge amount of smoke and sulfur dioxide gas liberated into the atmosphere. These gaseous products gets mixed with the droplets of fog already present in the atmosphere. This lead to the formation of industrial smog. The industrial smog forms a thick blanket of smog or haze nearly close to the ground.

Final answer:

Sulfur dioxide is a primary component of industrial smog and photochemical smog, but it does not directly influence thermal inversion. It is released into the atmosphere predominantly from burning fossil fuels.

Explanation:

Sulfur dioxide is a significant component in the creation of both industrial smog and photochemical smog, two serious urban air pollutants. During industrial activities, fossil fuels such as coal and oil that contain sulfur are burned, releasing sulfur dioxide into the atmosphere. This gas then reacts with water vapor and other compounds to form industrial smog. In the case of photochemical smog, when sulfur dioxide interacts with sunlight, volatile organic compounds, and nitrogen oxides, it contributes to the formation of this harmful type of smog. However, sulfur dioxide does not directly relate to the occurrence of thermal inversion, a weather-related phenomenon that can trap smog and other pollutants close to the ground.