DNA evidence should be wrapped in plastic before packaging to send to the lab for analysis.

True

False

Answer:

It should be D

Explanation:

Stratum is a layer of rock in the ground

Answer:

5.5 L

Explanation:

Answer:

A. 46

Explanation:

Human cells normally contain 23 pairs of chromosomes, for a total of 46 chromosomes in each cell .

Answer:

4332.5 j

Explanation:

Specific heat of water is 4.186 j /g-C

4.186 j / g-C  * 75 g  * (36.1-22.3 C) =

The product of the reaction will be polar in nature due to the bonds formed between hydrogen and oxygen or nitrogen.

The product of a chemical reaction is the substance which is formed at the end of the reaction by the reactant or reactants.

The product of a reaction can be formed from the rearrangement of atoms in a compound due to changes in the environment of that compound.

The product can also be formed by the addition or removal of atoms of the reactants.

In the example above, no reactant is shown, however the bonds formed between hydrogen and oxygen or nitrogen gives polarity to the product formed.

Hence, a reactant must be present for a product to be formed.

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Answer:

i think grass hopper

Explanation:

answer my question i am am brainiest

Answer:

temperatures

enzyme activity

Answer:

Nucleic acids

Explanation:

all organic foods (fruit, meat, etc) contain it to some degree. because all organic foods have dna in them.

For the solubility of a gas is 0.890 g/L at a pressure of 120 kPa, the solubility of the gas, if the pressure is changed to 100 kPa is mathematically given as

c=0.741g/l

Generally, the equation for the Pressure   is mathematically given as

p=kc

Therefore

k=p/c

k = 120 /0.890

k=134.8

In conclusion, if p=100kpa

c=p/k

c=100/134.8

c=0.741g/l

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Answer:

O 392 g

Explanation:

39.2 grams of oxygen (O2) can be produced.

The concept stoichiometry is used here to determine the grams of oxygen produced. The amount of oxygen produced from the decomposition of 244 grams of potassium chlorate is 96.0 g . The correct option is C.

The stoichiometry is an important concept in chemistry which helps us to use the balanced chemical equation to calculate the amount of reactants and products. Here we make use of the ratios from the balanced equation. It help us to understand how much substance is needed or present.

Here the balanced reaction is:

2 KCIO₃(s) + 2 KCl(s) + 3 O₂(g)

2 moles of KCIO₃ = 2(39 + 35.5 + 3 × 16) = 245 g

3 moles of O₂ = 3 × 2 × 16 = 96 g

245 g KCIO₃ produces 96 g O₂

Therefore 245 g gives 96 × 244/245 = 95.6 g ≈ 96.0 g

Thus the correct option is C.

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Answer:

I believe they are electrons, atoms, ions, or molecules.

Explanation:

Is apologize if it is incorrect-

I hope it helps! Have a great day!

Muffin~

Answer:

Units:

electrons

ions

atoms

molecules

Explanation:

I hope it helps!
Have a great day!

<3

For  a typical mammalian cell, the net transport by the sodium-potassium exchange pump, Work done is mathematically given as

W= 5.6*10-18 J

Generally, the equation for the Potential difference   is mathematically given as

Potential difference = Work done / Charge

Therefore

W=q*P.d

Q= 500 * 1.6*10-19 C

P.d. = 70 mV

In conclusion,Workdone  

W500 * 1.6*10-19 * 70*10-3

W= 5.6*10-18 J

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Answer:

the first one is branched, the second one is also branched and the third one is cycloalkane

Answer:

A: straight chain, B: branched chain, and C: cycloalkane.

Explanation:

Addition of HCl  leads to te formation of blue CoCl4^2– while the addition of AgNO3 leads to the formation of pink  Co(H2O)6^2+.

Dynamic equilibrium is said to have been attained in a reaction when the rate of forward reaction is equal to the rate of reverse reaction. Now we have the equilibrium as shown in the image attached.

When we add HCl as in trial 1, the equilibrium position is shifted to the left and blue CoCl4^2– is formed. When we add AgNO3, the Cl^- is precipitated out of solution and the equilibrium shifts towards the left to yield pink Co(H2O)6^2+.

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Answer:

6.02 x 1023

Explanation:

Its numerical value is 6.02 x 10 (23). Therefore, a 12.01 g sample of carbon contains 6.02 x 10 (23) carbon atoms.

Answer:

Electricity can be present in a static charge, while magnetism's presence is only felt when there are moving charges as a result of electricity. In simple words, electricity can exist without magnetism, but magnetism cannot exist without electricity.





HOPE THIS HELPS, HAVE A GREAT DAY!!~

Explanation:

Based on the assumption that the reaction involves N and O to produce NO, if 25.0 g of NO are produced, the amount of N gas used would be 11.66 grams

From the equation of the reaction:

       N + O ---------> NO

Mole ratio of N to NO is 1:1

Mole of 25.0 g of NO = 25/30.01 = 0.833 moles

Equivalent mole of N = 0.833 moles

Mass of 0.833 moles N = 0.833 x 14 = 11.66 grams

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Answer:

Insecticides are not good for health. Their use is harmful to other animals, birds and humans. But, without their use, it is not possible to grow the required amount of food. So, "the use of insecticide is not an interest, but an obligation".

The new volume occupied by the sample of gas is 4.96L.

Given the data in the question;

Final Volume; [tex]V_2 = \ ?[/tex]

Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]

To calculate the new volume the gas occupy, we subtsitute our given values into the expression above.

[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\ \\ P_1V_1T_2 = P_2V_2T_1\\\\0.750atm * 8.20L * 325K = 1.075atm * V_2 * 375K\\\\1998.75LatmK = 403.125atmK * V_2\\\\V_2 = \frac{1998.75LatmK}{403.125atmK} \\\\V_2 = 4.96L[/tex]

Therefore, the new volume occupied by the sample of gas is 4.96L.

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Answer:

a reaction that can occur in both forward and reverse directions at the same time.

Explanation:

This is because ↓

A reversible reaction is a reaction in which the conversion of reactants to products and the conversion of products to reactants occur simultaneously. A and B can react to form C and D or, in the reverse reaction, C and D can react to form A and B.

Hope this helps =)

1.

a) Salt: any chemical compound formed from the reaction of an acid with a base, with all or part of the hydrogen of the acid replaced by a metal or other cation.

Acid + alkali → salt + water

b)

Tetraoxosulfate (VI), SO2−4,SO42−, is the second conjugate base from the dissociation of sulfuric acid, H2SO4.H2SO4. This acid is a diprotic acid and thus can donate two protons in an aqueous solution to form HSO−4HSO4− after the first dissociation and SO2−4SO42− after the second dissociation.

The fact that tetraoxosulfate (VI) is dibasic means in terms of Brønsted-Lowry acid-base theory, the ion can accept two protons, or in other words, the parent acid donates two protons upon dissociation. This can be shown by the equation of the reaction between the parent sulfuric acid and potassium hydroxide where two hydrogens are replaced:

H2SO4+2KOH → K2SO4+2H2O

2. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications. In nature, there are many systems that use buffering for pH regulation.

For example, blood in the human body is a buffer solution.

Buffer Solutions are used for fermentation in the making of alcohol


I've only answered 1 & 2

Answer:

When a gas expands into a vacuum, its entropy increases because the increased volume allows for greater atomic or molecular disorder. The greater the number of atoms or molecules in the gas, the greater the disorder.

Explanation:

Answer:

cyclohexene I think that's the answer

Answer:

Half mole or 0.5 moles

__________________________________________________________

Oxygen has a molar molar mass of 32 g.

This means that O2 will have half that amount of grams, half-mole-substance.

6.022*10^23 molecules are present in one mole of any substance, so half it for O2.

6.022 × 10²³ [tex]-- >[/tex] 3.011 × 10²³

And simplified, that would make your answer 0.5 moles.

________________________________________________________

Ask in the comments box, please.

Answer:

Stalactites - Hang from caves ceilings

Stalagmites - Grow from cave floors

Sinkholes - Collapsed caves

Speleothems - Cave features

Explanation:

Got it right :)

trimethyl nonane

Explanation: