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3 years ago

A twisted ladder can be a model of the structure of a DNA molecule.

Chemistry

2 answers:

Luba_88 [7]3 years ago

8 0

Answer:

the answer is C

Explanation:

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tamaranim1 [39]3 years ago

6 0

Answer: It will very well be C.

Explanation:

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Which of these substances i) jello ii) the liquid called tea iii) distilled water is a mixture?

11111nata11111 [884]

The answer is ii) the liquid called tea.

That is ii) the liquid called tea is a mixture.

the liquid called tea is a homogeneous mixture that contains organic and inorganic compounds, sugar(organic carbohydrate),tea leaf extract(organic), water(inorganic).

Whereas (iii) distilled water, is a pure substance while (I) gello is a colloid.

7 0

3 years ago

C5h12 with one tertiary carbon

AfilCa [17]

Answer:

See attached image.

Explanation:

Hello there!

In this case, according to the isomeric structure of hydrocarbons, it is possible to draw a five-carbon hydrocarbon with a tertiary carbon by keeping in mind these tertiary carbons are characterized by the presence of three bonds with carbon atoms.

In such a way, as shown on the attached image, the second carbon from left to right is tertiary because of the aforementioned, and also, the compound has five carbon atoms and twelve hydrogen atoms.

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3 0

3 years ago

If you weighed out 0.38 g of calcium and reacted it with an excess of hcl, how many moles of h2(g) would you expect to produce?

Hitman42 [59]

Answer is: 0,0095 mol of hydrogen gas will be produced in reaction.
Chemical reaction: Ca + 2HCl → CaCl₂ + H₂.
m(Ca) = 0,38 g.
n(H₂) = ?
n(Ca) = m(Ca) ÷ M(Ca).
n(Ca) = 0,38 g ÷ 40 g/mol
n(Ca) = 0,0095 mol.
from reaction: n(Ca) : n(H₂) = 1 : 1.
n(H₂) = n(Ca) = 0,0095 mol.
n - amount of substance.

4 0

3 years ago

HELP 20 POINTS

REY [17]

The answer is 30.84

4 0

3 years ago

Naturally occurring neon exists as three isotopes. 90.51% is ne-20 with a mass of 19.99 amu, 0.27% is ne-21 with a mass of 20.99

gregori [183]

The atomic mass of an element is the average relative mass of its atoms as compared with an atom of carbon-12 whose mass is taken as 12. In terms of percentages of different isotopes, the average atomic mass can be determined as follows: $A_{average}$ = ∑( $p_{i}$ X $A_{i}$ )/100. Where, $p_{i}$ is the percentage abundance of isotope with atomic number $A_{i}$ .

So, average atomic mass of neon = $\frac{(90.51 X 19.99) + (0.27 X 20.99) + (9.22 X 21.99)}{100}$ = 20.177 amu.

3 0

3 years ago