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Lerok [7]
2 years ago
13

Which of the following is a reason that a scientist would want to use a model to study DNA? A. DNA may not really exist

Chemistry
1 answer:
Otrada [13]2 years ago
7 0

I think it is D but i'm not sure

hope I helped :)

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Which pair of elements form in a conic bond with each other
Nutka1998 [239]

I think you mean ionic bond and not conic bond. The pair of elements that form an ionic bond are barium and chlorine.

3 0
3 years ago
Balance this nuclear reaction by supplying the missing nucleus: 249/98 Cf +__ --> 263/106 Sg +4 1/0 n
Sholpan [36]
The total atomic number must be the same on each side. The total mass number must be the same on both side. 

<span>On the RHS, for the mass number, we have 257 + 4 = 261 (the 4 comes from the 4 neutrons). That means the mass number of the missing piece on the LHS is 261 - 247 = 14. </span>

<span>One the RHS, for the atomic number we have a total of 104 since the 4 neutrons are all neutral. On the LHS, we have this: 104 - 98 = 6. </span>

<span>The missing piece is a nucleus of carbon 14. Done in your style, it is 14/6C</span>
5 0
3 years ago
Read 2 more answers
A scientist studying an organism and has classified it as an animal which statement must be true about the organism
MakcuM [25]

Answer:

can you add the answer choices

Explanation:

8 0
3 years ago
How many moles of potassium iodide (KI) are in 48.9 g of potassium iodide (KI) ? ____ moles
wel

Answer:

mass of kI = 74.55 Atomic mass

74.55 g ---> 1 mole

48.9 g --> ?

48.9 / 72

0.7 mole.

In one mole of kI --->

5 0
2 years ago
Calculate ∆E for the following case:
NARA [144]

Answer:

The internal energy(ΔE) of a substance is calculated below:

From the first law of thermodynamics;

ΔE=q+w

Explanation:

<u>ΔE=q+w</u>

here;

+q=endothermic reaction

-q=exothermic reaction

+w=work done on the system

-w=work done by the system

Given:

q=+1.62kJ=1620J

w=-874J

To solve:

the internal energy(ΔE)

We know:

ΔE=q+w

<em>according to the problem;</em>

ΔE=q-w

since;

w=-874J (i.e.)work is done by the system.

ΔE=1620-874

ΔE=+746J

Therefore the internal energy is +746J

i.e. the option is "c"(+746J)

5 0
3 years ago
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