Draw the lewis structure of sf2, showing all lone pairs.

Answer:

41.495

Explanation:

107 gm of 2NH4Cl gives 111 gm of CaCl2

40 gm of 2 NH4Cl gives =(111*40)/107

=41.495 gm of CaCl2

Answer: Ok

Explanation: Explanation:Using recombinant DNA technology to modify an organism's DNA to achieve desirable traits is called genetic engineering. Addition of foreign DNA in the form of recombinant DNA vectors that are generated by molecular cloning is the most common method of genetic engineering.

Answer:

It has no definite shape or volume.

In the Lewis symbol for a fluorine atom, there are 4 paired and 1 unpaired electrons.

However, paired electrons simply means are 2 electrons occupying the same orbital in an atom or molecule of a substance

On the other end, unpaired electron is a single electron that occupies an orbital of an atom.

An atom is the smallest part of an element which can take part in a chemical reaction.

Some atoms of elements are:

In conclusion, in the Lewis symbol for a fluorine atom, there are 4 paired and 1 unpaired electrons.

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Answer: 6, 1

Explanation:

Answer:

DNA fingerprinting is a laboratory technique used to establish a link between biological evidence and a suspect in a criminal investigation.

A DNA sample taken from a crime scene is compared with a DNA sample from a suspect. If the two DNA profiles are a match, then the evidence came from that suspect.

Based on the table and the equation of reaction; the

The rate of a reaction is the rate at which reactants molecules are consumed or products are formed.

Based on the equation of reaction, the rate of consumption of oxygen is equal to the rate of consumption of methane.

Thus. rate of consumption of oxygen from time 20 seconds to time 60 seconds is calculated as follows:

Rate between 20 and 40 = 1.0 - 0.9/20

Rate between 40 and 60 = 0.9 - 0.85/20

Therefore, the rate of consumption of oxygen decreases with time.

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Answer:

A

Explanation:

Hii there !

The reaction accompanying production of water in this case would be -

[tex]\green{ \underline { \boxed{ \sf{2H_2+O_2\longrightarrow 2H_2O}}}} [/tex]

Thus ,by observing the reaction, we can conclude that 2 mole of Hydrogen [tex](H_2 )[/tex]react with 1 mole of oxygen[tex](O_2)[/tex]to produce 2 mole of water [tex](H_2O)[/tex]

Now,

To produce 1 moles of water.

Moles of Oxygen[tex](O_2)[/tex] required [tex] = \frac{1}{2}[/tex] moles

Similarly,

To produce 4 moles of water.

[tex]\implies[/tex] Moles of Oxygen[tex](O_2)[/tex] required = [tex]\frac{1}{2}\times 4[/tex] moles

[tex]\implies[/tex] 2 moles

Hope it helps.

Explanation:

1) False

2) True

3) True

4) True

5) False

6) True

7) False

8) False

9) False

10) True

I hope it helps you

I'm sorry if I'm late

Answer:

Sour and Possible Burns

Explanation:

Bases are soapy, not acids.

All acids are sour to taste.

Neither bases nor acids are sweet.

Sharp is a physical trait for things such as knives, not acidic liquids.

Acids can cause burns if handled incorrectly.

The minimum amount of NaOH and HCl that must be present to produce 18.48grams of NaCl is 12.6g and 11.5g  respectively.

The balanced neutralization reaction equation for the formation of NaCl is,

NaOH + HCl ---> NaCl + H2

The molar mass of NaOH = 23+16+1 = 40g/mol

The molar mass of NaCl = 23 +35.5 = 58.5g/mol

If  40g of NaOH = 58.5g of NaCl

∴ x g of NaOH   = 18.48g of NaCl

Make xg the subject of formula,

x g of NaOH = 40 × 18.48/58.5

                     = 739.2/58.5

                     = 12.6g of NaOH

The molar mass of HCl = 1 +35.5 = 36.5g/mol

If  36.5g of  HCl= 58.5g of NaCl

∴ x g   of HCl       = 18.48g of NaCl

Make xg the subject of formula,

x g of HCl       = 36.5 × 18.48/58.5

                       = 674.52/58.5

                       = 11.5g of HCl

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The original mass of krypton 81 that is present in the ice is 6.70 grams.

Original mass of any substance will be calculated as below for the decomposition reaction is:

N = N₀(1/2)ⁿ, where

N = remaining mass of krypton-81 = 1.675g

N₀ = original mass of krypton-81 = ?

n will be calculated as:
n = T/t, where

T = total time period = 458,000 years

t = half life time = 229,000 years

n = 458,000/229,000 = 2

Now putting all these values on the above equation, we get

N₀ = 1.675 / (1/2)²

N₀ = 6.70 g

Hence required mass is 6.70 g.

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Answer:

C

Explanation:

because 37 does not end with 5 or 0, so it'd be harder to see if the water temperature is accurate if your thermometer goes up by 5s or 10s. And using D, the one that goes up by 20s is out of the question, it'd be too difficult to read. Using a thermometer that goes up by 1s is just best because you can be positive when the water is at 37°C

Answer:

three to four days

Explanation:

Leftover steak is safe to eat after three to four days in the refrigerator—any longer and you could catch a foodborne illness from bacteria growth. Bacteria can also grow on perishable food that has been left out at room temperature for over two hours or kept at a temperature lower than 40°F.

Explanation:

The question had been answered above

The minimum mass of Zinc, Zn that needs to be added to 0.500 g of iodine so that the iodine fully reacts is 0.128 g

Zn + I₂ —> ZnI₂

Molar mass of Zn = 65 g/mol

Mass of Zn from the balanced equation = 1 × 65 = 65 g

Molar mass of I₂ = 127 × 2 = 254 g/mol

Mass of I₂ from the balanced equation = 1 254 = 254 g

SUMMARY

From the balanced equation above,

254 g of I₂ required 65 g of Zn

From the balanced equation above,

254 g of I₂ required 65 g of Zn

Therefore,

0.5 g of I₂ will require = (0.5 × 65) / 254 = 0.128 g of Zn

Thus, the minimum mass of Zn required is 0.128 g

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The pressure of the sample of gas with the given mol, volume and temperature is 5.33atm.

The Ideal gas law or general gas equation emphasizes on the state or behavior of a hypothetical ideal gas. It states that "pressure P times volume V is equal to moles times temperature and the universal gas constant. It is expressed;

PV = nRT

Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK ).

Given the data in the question;

We substitute our values into the expression above to determine the pressure of the gas in atmospheres.

PV = nRT

P = nRT / V

P = ( 6mol × 0.08206Latm/molK × 238K ) / 22L

P = 117.18168Latm / 22L

P = 5.33atm

Therefore, the pressure of the sample of gas with the given mol, volume and temperature is 5.33atm.

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You can't usually just use a single spectrum line to confirm the identity of an element because there are cases that the emission line id not clearly defined. When the emission line is very weak compared to surrounding noise, in which case the more datapoints you have to build up confidence for the existence of a particular emission spectra, the better.

Answer:

net force depends upon the object and also the mass of that object

Answer:The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object.

Explanation:

Based on the nature ofbthe reaction, entropy (ΔS) increases while enthalpy (ΔH) decreases.

Entropy changes, ΔS, refers to change in the degree of the disorderliness of a substance.

When substances become more random, entropy increases and vice versa.

For example, change of state from solid to liquid or gas results in increase in entropy.

Enthalpy changes, ΔH, refers to the changes in heat content of a substance, either a decrease or increase.

Enthalpy is negative when heat is lost and positive ehen heat is gained.

The enthalpy and entropy changes in the given reaction below is as follows:

2CaO(s) + H2O(l) —> 2Ca(OH)2(s)

Entropy, ΔS increases as the substance dissolves in water.

Enthalpy, ΔH, decreases as the substances gives off heat.

Therefore, in the given reaction entropy (ΔS) increases while enthalpy (ΔH) decreases.

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Answer:

A. would be your answer

Explanation:

Decomposers are especially important in retaining nutrients in their cells thus preventing loss of those nutrients from the root zone.

In an ecosystem, the decomposing web is important because decomposers help remove waste and use that energy to provide food for other animals.

An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass  which is present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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#SPJ7

Answer:

they are bigg has water in then and they a deep

Based on the titration curve of the monoprotic acid, pKa of the monoprotic acid is closest to 8.0.

A titration curve of an acid is a curve obtained from the plot of the pH against the amount of base added.

The titration curve of an acid reveals its pKa.

The pKa corresponds to the midpoint of titration when equal concentrations of the acid and base have reacted.

From the titration curve above, the pKa of the monoprotic acid is closest to 8.0.

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Examples of agroecology method use are in Burkina Faso are conservation tillage, green manures, natural fertilisers, biological predators and so on.

Agroecology refer to an approach that use ecological processes in agricultural production systems.

The benefits of Agroecology is that it help to protect, restore and also improve agriculture and food systems when there is climate shocks and unfavorable weather conditions.

Therefore, Examples of agroecology method use are in Burkina Faso are conservation tillage, green manures, natural fertilisers, biological predators and so on.

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Answer:

OF6

Explanation:

Oxygen and fluorine have almost the same electronegativity, so oxygen isn't able to donate enough electron density to fluorine to form OF6. Atomic size. There isn't enough room around an oxygen atom for six fluorine atoms.

:-befrank

A. applied force

force applied to an object

Answer:

A. Applied force

Explanation:

A. should be the answer because you applied force onto an object to make it move or do what you’d like.

I hope it helps! Have a great day!

Muffin~

Answer:

adenine (A, green), thymine (T, red), cytosine (C, orange), and guanine (G, blue).

Explanation:

The nitrogen bases in a DNA molecule are adenine, guanine, cytosine, and thymine. Adenine and guanine belong to a class of compounds called purines, and cytosine and thymine belong to a class of compounds called pyrimidines. In a DNA molecule, the two strands are connecting by hydrogen bonds between the nitrogen bases of each strand. According to the base-pairing rule, the purine adenine always pairs with the pyrimidine thymine, and the purine guanine always pairs with the pyrimidine cytosine...

The experiment referenced here involves the use of Y32P-ATP. The atom involved in the site of the covalent attachment is the N atom in Aminomethylcyclohexane (AMC).

Given that Aminomethylcyclohexane  (AMC) had been linked around the carboxyl side, it, therefore, means that that type of linkage called the Amide-Linkage (That is N-acylation)  can be utilized in the covalent bonding of the fluorophore into the peptide

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