What is the concentration of K+ ion in solution, in mmol/L?

The gene for tallness (T) in a pea plant is dominant over the gene for shortness (t).

astra-53 [7]

Answer:

C. 75%

Explanation:

From a heterozygous cross (Tt x Tt) the produced offspring would consist of:

25% TT -it would be tall-.

50% Tt -it would be tall as the gene T is dominant-.

25% tt -it would not be tall-.

Thus the produced offspring that would be tall is (50% + 25%) 75%. The answer is option C.

6 0

3 years ago

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A piston in a heat engine does 500 joules of work, and 1400 joules of heat are added to the system. Determine the change in inte

san4es73 [151]

Answer : The change in internal energy is, 900 Joules.

Solution : Given,

Heat given to the system = +1400 J

Work done by the system = -500 J

Change in internal energy is equal to the sum of heat energy and work done.

Formula used :

$\Delta U=q+w$

where,

$\Delta U$ = change in internal energy

q = heat energy

w = work done

As per question, heat is added to the system that means, q is positive and work done by the system that means, w is negative.

Now put all the given values in the above formula, we get

$\Delta U=(+1400J)+(-500J)=900J$

Therefore, the change in internal energy is 900 J.

The change in internal energy depends on the heat energy and work done. As we will change in the heat energy and work done, then changes will occur in the internal energy. Hence, the energy is conserved.

8 0

3 years ago

Lewis dot structure for Ca(OH)2

denis23 [38]

I hope this helps you

6 0

3 years ago

Draw the structure of the major organic product isolated from the reaction of 3-hexyne with hydrogen (1 mol), Lindlar palladium.

ohaa [14]

Answer:

See explanation and image attached

Explanation:

When 1 mole of hydrogen is added to 3-hexyne, the addition occurs on the same face or side of the triple bond to yield cis-2-hexene in the presence of lindlar catalyst which prevents further hydrogenation. This is known as syn addition.

The syn addition is achieved because the hydrogen molecule is first adsorbed on the surface of the palladium metal and is subsequently attached to the same face of the triple bond in 3-hexyne as shown in the image attached to this answer.

6 0

3 years ago

A sample of 1.000 g of a compound containing carbon and hydrogen reacts with oxygen at elevated temperature to yield 0.692g H2O

Kazeer [188]

Answer:

A. 0.922g and 0.0768g

B. NO

Explanation:

A.

To know the answer, we need to find the mass of the carbon and hydrogen present and see if they add up.

Firstly we get the mass of the carbon and hydrogen.

For the carbon, we first divide by the molar mass of carbon iv oxide which is 44g/mol.

The number of moles of carbon iv oxide is thus 3.381/44 = 0.076841

Since there is only one carbon atom, the answer is same as the number of moles of carbon. The mass is the only different thing here. The mass is the number of moles multiplied by the atomic mass. The atomic mass of carbon is 12. Thus, the total mass would be 0.076840909090909 * 12 = 0.922g

Now we calculate for hydrogen. We first find the number of moles from that of water. The molar mass of water is 18g/mol.

The number of moles is thus 0.692/18 = 0.0384

Now since we have 2 atoms of hydrogen in one mole of water, the number of moles of water present is thus 0.0384 * 2 = 0.0768

Now, since we know the number of moles, we can get the mass. The atomic mass of hydrogen is 1. This means that the mass if the hydrogen in the compound is 0.0768 * 1 = 0.0768g

B. We simply add the masses of hydrogen to that of carbon and subtract from 1. This is 1 - 0.922 - 0.0768 = 0.0012

The answer is no. We only have that residue because of rounding up of values

6 0

3 years ago