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3 years ago

4. If the DNA nitrogen bases were TACCGGAT, how would the other half of

Chemistry

1 answer:

Elena L [17]3 years ago

6 0

Answer:

ATGGCCTA

Explanation:

For this we have to keep in mind that we have a specific relationship between the nitrogen bases:

-) When we have a T (thymine) we will have a bond with A (adenine) and viceversa.

-) When we have C (Cytosine) we will have a bond with G (Guanine) and viceversa.

Therefore if we have: TACCGGAT. We have to put the corresponding nitrogen base, so:

TACCGGAT

ATGGCCTA

I hope it helps!

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a 50.0 mL sample of KCl requires 22.40 mL of 0.0229 M Pb(NO3)2 in order to completely titrate it. What is the Molarity of the KC

garik1379 [7]

Answer:

0.02052M

Explanation:

First, we need to write a balanced equation for the reaction. This is illustrated below:

2KCl + Pb(NO3)2 → 2KNO3 + PbCl2

The following were obtained from the question:

Molarity of Pb(NO3)2 = 0.0229M

Volume of Pb(NO3)2 = 22.40 = 22.4/1000 = 0.0224L

Number of mole of Pb(NO3)2 =?

Recall:

Mole = Molarity x Volume

Mole of Pb(NO3)2 = 0.0229x0.0224

Mole of Pb(NO3)2 = 5.13x10^-4mole

From the equation,

1mole of Pb(NO3)2 required 2moles KCl.

Therefore, 5.13x10^-4mole of Pb(NO3)2 will require = 5.13x10^-4x2 = 1.026x10^-3mole of KCl.

Now we can use this amount (i.e 1.026x10^-3mole) to find the molarity of KCl. This is illustrated below:

Mole of KCl = 1.026x10^-3mole

Volume of KCl = 500mL = 50/1000 = 0.05L

Molarity =?

Molarity = mole /Volume

Molarity of KCl = 1.026x10^-3/0.05

Molarity of KCl = 0.02052M

8 0

4 years ago

A chamber has a pressure of 1.5 atm at a volume of 1.4 L. What is the pressure when the piston compresses the sample

nordsb [41]

Answer:

C.) 3.5 atm

Explanation:

Because you are dealing with pressure and volume, you can use Boyle's Law to help you find the missing variable. The general formula looks like this:

P₁V₁ = P₂V₂

In this formula, "P₁" and "V₁" represent the pressure and volume of the chamber originally. "P₂" and "V₂" represent the final pressure and volume. You have been given the values of all the other variables but "P₂". Therefore, you can plug these values into the formula and simplify to find the final pressure.

P₁ = 1.5 atm

V₁ = 1.4 L

P₂ = ?

V₂ = 0.60 L

P₁V₁ = P₂V₂ <---- Boyle's Law formula

(1.5 atm)(1.4 L) = P₂(0.60 L) <---- Plug in values

2.1 = P₂(0.60 L) <---- Multiply 1.5 and 1.4

3.5 = P₂ <----- Divide both sides by 0.60

4 0

2 years ago

3. When two forces act in the SAME direction on an object, the net force is found by

jekas [21]

Answer:

subtracting

Explanation:

subtracting

4 0

4 years ago

A student used a sling psychrometer to measure the humidity of the air. If the relative humidity was 65% and the dry bulb temper

nataly862011 [7]

Answer:

3° C

Explanation:

The dew point temperature is the temperature of the air to which the air must be cooled so as to become saturated with the water vapor.

Here it is given that the relative humidity in the air, RH= is 65%

And the dry bulb temperature is T = 10° C

Therefore, the dew bulb temperature is,

$Td= T - \frac{100-RH}{5}$

$Td= 10 - \frac{100-65}{5}$

= 10 - 7

= 3° C

So the dew point temperature is 3° C .

3 0

3 years ago

Why are negative ions usually larger than positive ions

olga nikolaevna [1]

In a negative ion, or anion, electron(s) have been added to the atom. This means the like charges within the electron cloud are now repelling each other more than they were before. The proton count, however, has not changed. So, the electron cloud, in response to the added electron(s) expands with that extra repulsion. the negative Ions will have gained an electron fill an electron shell while a positive Ion will have lost an electron in order to shed its outermost shell, thereby making the atom smaller.

Hope this helps!

6 0

4 years ago