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3 years ago

11

Two reasons why a scientist might want to study the DNA of strawberries?

2 answers:

ElenaW [278]3 years ago

5 0

Following are the two reasons.

They can figure out how the preparations collected in DNA help your body to perform properly. They can use DNA to make modern medicines or genetically transform crops to be resistant to insects. Strawberries are a very marketable horticultural crop. They do experience from disease and insect attacks, are responsive to heat and cold and prefer a comparatively close range of soil types for best production.

The study of strawberry DNA may provide the plant breeder with keys to thriving strategies to master these and many other restrictions for the strawberry product.

fenix001 [56]3 years ago

3 0

1.To discover the chromosomal state of the species in order to advance on Knowledge of the species Evolutionary process.
2. To form a hybrid of the species.

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You determine that it takes 26.0 mL of base to neutralize a sample of your unknown acid solution. The pH of the solution was 7.8

Lubov Fominskaja [6]

Complete Question

You determine that it takes 26.0 mL of base to neutralize a sample of your unknown acid solution. The pH of the solution was 7.82 when exactly 13 mL of base had been added, you notice that the concentration of the unknown acid was 0.1 M. What is the pKa of your unknown acid?

Answer:

The pK_a value is $pK_a =7.82$

Explanation:

From the question we are told

The volume of base is $V_B = 26.mL = 0.0260L$

The pH of solution is $pH = 7.82$

The concentration of the acid is $C_A = 0.1M$

From the pH we can see that the titration is between a strong base and a weak acid

Let assume that the the volume of acid is $V_A = 18mL= 0.018L$

Generally the concentration of base

$C_B = \frac{C_AV_A}{C_B}$

Substituting value

$C_B = \frac{0.1 * 0.01800}{0.0260}$

$C_B= 0.0692M$

When 13mL of the base is added a buffer is formed

The chemical equation of the reaction is

$HA_{(aq)} + OH^-_{(aq)} --------> A^{+}_{(aq)} + H_2 O_{(l)}$

Now before the reaction the number of mole of base is

$No \ of \ moles[N_B] = C_B * V_B$

Substituting value

$N_B = 0.01300 * 0.0692$

$= 0.0009 \ moles$

Now before the reaction the number of mole of acid is

$No \ of \ moles = C_B * V_B$

Substituting value

$N_A = 0.01800 *0.1$

$= 0.001800 \ moles$

Now after the reaction the number of moles of base is zero i.e has been used up

this mathematically represented as

$N_B ' = N_B - N_B = 0$

The number of moles of acid is

$N_A ' = N_A - N_B$

$= 0.0009\ moles$

The pH of this reaction can be mathematically represented as

$pH = pK_a + log \frac{[base]}{[acid]}$

Substituting values

$7.82 = pK_a +log \frac{0.0009}{0.0009}$

$pK_a =7.82$

8 0

3 years ago

Oxidation number of sulphur in H2SO4

DochEvi [55]

Answer

let the oxidation of sulphur is x

2(+1)+x+4(-2)=0

+2+x-8=0

+2-8+x=0

-6+x=0

x=6

Explanation:

i hope this will help you:)

8 0

3 years ago

a solid sample of oil is warmed until it turns into a liquid. which property of the oil will decrease?

raketka [301]

I think the answer is it turnes into a gas. Hope it helps! :) Asnwer is density.

4 0

3 years ago

What is the mass percentage of O in C₂H₄O₂? Provide an answer to two decimal places.

nasty-shy [4]

Answer:

53.29%

Explanation:

The molar mass of C2H4O2 is 60.05g and the 2 O's are 32.00g

so 32.00/60.05= 0.53288925895

and that as a decimal rounded to the nearest hundredths is 53.29%

6 0

2 years ago

5. What is the number value of absolute zero? *<br> (

Norma-Jean [14]

Answer:

0

Explanation:

it is 0 I believe nothing

7 0

2 years ago