organic chemical used to preserve biological specimens is organic compound or hydrocarbons​

Answer:

C. increase crop yields

Explanation:

Genetically modified organisms are those organisms that have been improved using genetic engineering procedures. Genetic engineering/modification is the manipulation of an organism's genome in order to get an improved organism with desirable traits.

The organisms being genetically modified or engineered is called GMO or transgenic organisms. Hence, in this case, one feature of the crops being genetically modified is to have an INCREASED YIELD.

Answer is 2

4Fe + 3O2 –> 2Fe2O3

Answer:

Explanation:

The answer is D

Answer:

D. The granularity of locks.

Explanation:

X-locks is one of the locks used in locking database in what is known as adaptive server. Other types of locks for locking database are the S-lock, IS-locks, and the IX- locks. The locks are used mainly for control purpose[ that is when a data is been used by a lot of people, the locks make sure that there is consistency in the data.  

The option D is correct that is; ''The moment that X-locks are released will determine the granularity of the locks'' The granularity of the locks simply means the amount in which the data can be locked at the same time.

Answer:

Explanation:

The answer is Option D, The Granularity of locks:

In computer science granularity locking is a locking method used in database management systems (DBMS) and relational databases, and granularity of locks in a database refers to how much of the data is locked at one time and it is determined when S locks are released which means Shared Locks.

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Answer:

417

Explanation:

50um is

50000nm

50000:120=417

Answer:

1.02 × 10⁶ g

Explanation:

Step 1: Given data

Step 2: Convert "V" to L

We will use the conversion factor 1 m³ = 1000 L.

5400 m³ × 1000 L/1 m³ = 5.400 × 10⁶ L

Step 3: Convert "P" to atm

We will use the conversion factor 1 atm = 101325 Pa.

1.10 × 10⁵ Pa × 1 atm / 101325 Pa = 1.09 atm

Step 4: Calculate the moles of He (n)

We will use the ideal gas equation.

P × V = n × R × T

n = P × V / R × T

n = 1.09 atm × 5.400 × 10⁶ L / 0.08206 atm.L/mol.K × 280 K

n = 2.56 × 10⁵ mol

Step 5: Calculate the mass of He (m)

We will use the following expression.

m = n × M

m = 2.56 × 10⁵ mol × 4.002 g/mol

m = 1.02 × 10⁶ g

Answer:A. The deodorant evaporates as it absorbs thermal energy from James’s skin.

Explanation:

[H₃O⁺] = 8.86 x 10³ M

The dissociation of water :

H₂O(l)⇒H⁺+OH⁻

Hydrogen ions H⁺ bond with H₂O to form H₃O⁺ ions(hydronium ion)

When acid(Hbr acid) is in the presence of water(dissociates), the H⁺ ions bond with water molecules to form hydronium, the reaction :

HBr(aq)+H₂O→H₃O+(aq)+Br−(aq

So Ionization of HBr :

[tex]\tt HBr\rightarrow H_3O^++Br^-[/tex]

[HBr]= 8.86 x 10³,

From equation ratio [H₃O⁺] : HBr = 1 : 1, so

[tex]\tt [H_3O^+]=8.86\times 10^3[/tex]

Heat would be required  : 1,670 J

Given

mass of H₂O=5 g

Required

Heat to melt

Solution

The heat to change the phase can be formulated :

Q = m.Lf (melting/freezing)

Lf=latent heat of fusion

The heat of fusion for water at 0 °C : 334 J/g

Input given values in formula :

[tex]\tt Q=5\times 334=\boxed{\bold{1,670~J}}[/tex]

Answer:

13 minutes

Explanation:

For the endothermic reaction to reach 0°C, it will take 13 minutes.

 Let us follow the process step by step;

 Rate of decrease is 2°C per minute.

  Start is 26°C

    Time                   temperature

     0 min                    26°C

      1 min                     24°C

      2 min                     22°C

     3 min                      20°C

    4 min                       18°C

   5 min                        16°C

     6 min                      14°C

     7 min                      12°C

     8 min                     10°C

    9 min                       8°C

     10 min                      6°C

     11 min                       4°C

     12 min                      2°C

      13 min                      0°C

Answer:

4.8× 10²³ atoms

Explanation:

Given data:

Number of moles of San element = 0.796 mol

Number of atoms present = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

0.796 mol ×  6.022 × 10²³ atoms / 1mol

4.8× 10²³ atoms

Answer:

It starts to move because of Newtons first law "An object will not change it's motion unless a force acts on it"

Explanation:

Meaning ball B is that force acting upon ball A

Answer:

No

Explanation:

My sister uses this all the time and it is perfectly safe

Answer:

no

Explanation:

as long as you change it up a little and word it to look like your own

Answer:

Phosphorus

Explanation:

Lewis Dot Structure is a structural representation of a molecule that shows valence electrons of a molecule.

The element in group 15, period 3 is Phosphorus (P). Phosphorus has an atomic number 15 and valence electrons are 5. So, the lewis structure will show 5 dots around P atom.

Answer:

Exposed surface area

Explanation:

The powdered calcium carbonate will react faster with hydrochloric acid than calcium carbonate chips due to the exposed surface area.

Powdered calcium carbonate has a larger surface area compared to the chips. And, the larger the surface area exposed on a body, the faster the reaction it will undergo.

For the same masses of a solid substance, the smaller the particle size of each form, the larger the surface area exposed to reaction.

The surface area exposed proportionally affects the rate of reaction.

We are given:

Wavelength of Green light (λ) = 531 nm  OR   531 * 10⁻⁹ m

Speed of light (c) = 3* 10⁸ m/s

Solving for the Frequency of the wave:

We know the relation:

c = νλ    

(where ν is the frequency, c is the speed of light and λ is the wavelength)

3*10⁸ = ν*(531*10⁻⁹)

ν = 3*10⁸ / 531*10⁻⁹                  [dividing both sides by the wavelength]

ν = 3*10⁸*10⁹ / 531                   [ since a⁻¹ = 1/a]

ν = 3*10¹⁷ / 531                         [ since mᵃ * mᵇ = mᵃ⁺ᵇ]

ν = 10¹⁷ / 177

ν = 1000 * 10¹⁴ / 177                 [we split the numerator to simplify]

ν = 5.65 * 10¹⁴

Hence, the frequency of Green light is 5.65 * 10¹⁴ Hz

Answer:

f = 5.6×10¹⁴ Hz  

Explanation:

Given data:

Wavelength of green light = 531 nm (531×10⁻⁹ m)

Frequency of green light = ?

Solution:

Formula;

Speed of wave = wavelength × frequency

Speed of wave = 3.00×10⁸ m/s

by putting vales,

3.00×10⁸ m/s = 531×10⁻⁹ m × f

f = 3.00×10⁸ m/s / 531×10⁻⁹ m

f  = 0.0056×10¹⁷ s⁻¹

f = 5.6×10¹⁴ Hz    (Hz = s⁻¹)

Answer:

1300 ppm

Explanation:

for ppm, calculate fractional ration =(part/total) and multiply by 1 x 10⁶ => ppm

for ppb, calculate fractional ration =(part/total) and multiply by 1 x 10⁹ => ppb

Parts Per Million (ppm)

Given 1.36g in 1Kg (=1000g) => fractional ratio = (1.3g/1000g)(10⁶) = 1300 ppm

Parts Per Billion (ppb)

or if ppb is needed do the same calculation but multiply by 10⁹ ... That is,

Given 1.36g in 1Kg (=1000g) => fractional ratio = (1.3/1000g)(10⁹) = 1300000 ppb = 1.3 x 10⁶ ppb

Parts per Hundred (pph) is the same as percent (%) ... Calculate fractional ratio and then multiply by 100%

Given 1.36g in 1Kg (=1000g) => fractional ratio = (1.3g/1000g)(100%) = 0.13%

Answer:

A

Explanation:

This is because of the law of conservation of mass.  This means that even if a reaction occurs, the mass will remain the same.

New atoms will not be formed, but new compounds will.

Answer:

The appropriate alternative is "Option D".

Explanation:

All those other options aren't relevant to the situation in question. So the above alternative becomes the right one.

Answer:

8.51 x 10²¹ atoms

Explanation:

Given parameters:

Mass of K = 0.551g

Unknown:

Number of atoms = ?

Solution:

To find the number of atoms in this given substance, we need to solve for the number of moles first.

 Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

 Now;

     Molar mass of K  = 39g/mol

 Number of moles  = [tex]\frac{0.551}{39}[/tex] = 0.014mole

Therefore,

   1 mole of a substance contains 6.02 x 10²³ atoms

  0.014 mole of K will contain 0.014 x 6.02 x 10²³ = 8.51 x 10²¹ atoms

Answer:

B) increases

higher temperature = higher pressure

Answer:

You have to put equator in middle, trade winds on which ever side they are trading the items on, probaly north, and westerlies west, and jet streams around blue at the bottom, red at top and green in the middle.

Explanation:

I cant really explain it right because I don't know how to put the picture. I mean paste the picture on here

CAN YOU TELL ME HOW TO PUT PICTURE

Answer:

Answer is shown on the paper :D

Explanation:

Remember to follow sig-figs.

Answer:

See detailed explanation.

Explanation:

Hello!

In this case, for the reaction:

[tex]I_2+H_2\rightleftharpoons 2HI[/tex]

It is known that the equilibrium constant tends to be greater than 1; therefore, it is a reaction that tends to go rightwards towards the formation of hydrogen iodide.

a) Here, since the reaction tends to form the product, it is clear that the initial concentration of iodine and hydrogen will decrease as the reaction reaches equilibrium in order to increase the concentration of hydrogen iodide.

b) Yes, it stops at the point in which the following expression:

[tex]\frac{[HI]^2}{[I_2][H_2]}[/tex]

Equals the equilibrium constant.

Best regards!

Answer:

in vinyl chloride there exist a partial  double bond between chlorine and carbon atoms.this partial double bond increases  the strength of bond between  carbon and chlorine.

Explanation:

Answer:

1-because of mesomerism in carbon-halogen bond result to formation of a degree of double bond

Explanation:

[ Methylene=CH_X ] [ (-)Methylene_CH=X(+) ]

2- their preparation from ethylene dihalide

Answer:

I would guess that the MA of the screwdriver is 120N.

Explanation:

I think this because you are adding 30 and 90, since there are two forces being acted on the same place in the same direction.

#teamtrees #WAP (Water And Plant)

A balanced chemical equation obeys the law of conservation of mass. In a balanced chemical equation the mass of the reactants and products are equal. The correct option is true.

A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. The numbers which are used to balance the chemical equation are called coefficients. They are found in front of formulas.

According to law of conservation of mass, mass can neither be created nor be destroyed. But it can be transformed from one form to another.

In a balanced chemical equation, the total mass of the reaction remains constant. The mass of the reactants before reaction is equal to the mass of products after reaction.

Thus the given statement is true.

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Answer:

synthesis

Explanation:

hope this helps

The given reaction is a type of synthesis reaction.  

• The reactions, which takes place when two distinct molecules or atoms associate to produce a distinct molecule or compound is known as synthesis reactions.  

• The synthesis reactions are one of the prime categories of chemical reactions that comprise combustion reactions, single displacement, and double displacement reactions.  

• In synthesis reactions, energy is released and the reaction is exothermic, in some cases, endothermic is also possible.  

• In the given reaction atoms of phosphorus and oxygen combines to produce the compound phosphorus oxide.

Thus, the given case is an example of synthesis reaction.

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