4 years ago

Which cell copies its dna

Chemistry

1 answer:

KatRina [158]4 years ago

3 0

Molecules copy its DNA

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The magnitude of an earthquake is its:

Umnica [9.8K]

Answer:

25 size or length.

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3 years ago

An aluminum engine block has a volume of 4.77 L and a mass of 12.88 kg. what is the density of the aluminum in grams per cubic c

Whitepunk [10]

12.88 x 1000 = 12,880 g

4.77 x 1000 = 4770 cm³

D = mass / volume

D = 12,880 / 4770

D = 2.70 g/cm³

hope this helps!

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4 years ago

Un elemento posee dos isótopos cuyos números de masa suman 68 y la semisuma de sus neutrones es 19. Determine el grupo de este e

katovenus [111]

Answer:

The element belongs to group 15 of the present periodic table

Explanation:

Isotopes have the same proton number, what differs is that they have different number of neutrons.

Now since the half-sum of their neutrons is 19, the total number of neutrons would be 19 * 2 = 38 neutrons.

Also, their masses add up to be 68, since the total mass equals sum of neutrons and sum of protons, this means that the total number of protons is 68-38 = 30

Since this is equal in both isotopes, this means that the proton number of the element is 30/2 = 15

The atomic number is the number of protons in the nucleus of an atom. Since the atomic number is 15, this element is phosphorus and it belongs to group 15 of the present periodic table

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3 years ago

In which of the following substances does a beam of light travel the fastest?

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Answer:

Explanation:

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3 years ago

Water is to ____as liquid is to soild

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water is to gas as liquid is to solid

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3 years ago