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3 years ago

Which chemical symbol represents an element?

2 answers:

4 0

CO because it is the chemical symbol for the element cobalt whereas the rest are compound. H20 is water, CO2 is carbon dioxide and N2 is dinitrogen.

emmasim [6.3K]3 years ago

3 0

Answer: $N_2$

Explanation:

Element is a pure substance which is composed of atoms of similar elements.

It can not be decomposed into simpler constituents using chemical reactions.Example: Nitrogen $(N_2)$

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

It can be decomposed into simpler constituents using chemical reactions. Example: carbon dioxide $(CO_2)$ , water $(H_2O)$ , carbon monoxide $(CO)$

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What is the wavelength of radiation that has a frequency

White raven [17]

Answer:

$\lambda = \frac{c}{\nu}$

Explanation:

The wavelenght of a radiation is inversely proportional to its frequency. It can be estimated by the following formula:

$\lambda = \frac{c}{\nu}$

Where:

$\lambda$ is the wavelenght
$\nu$ is the frequency
$c$ is the speed of light (arroung 300000 km/s)

5 0

3 years ago

How does the tendency of iron to rust depend on ph?

mojhsa [17]

The tendency of iron to rust depend on the Ph of solution

The formation of rust increases as the PH decreases. This led agent of rusting that is oxygen gets more positive as H+ ions increase which facilitate rusting. The lower the Ph level the quick the corrosion.

6 0

3 years ago

Read 2 more answers

Does pb(no3)2 + Na3(PO4) = Pb3(PO4)2 + Na(NO3) have a precipitate?

ipn [44]

Answer:

Yes, Pb3(PO4)2.

Explanation:

Hello there!

In this case, according to the given balanced chemical reaction, it is possible to use the attached solubility series, it is possible to see that NaNO3 is soluble for the Na^+ and NO3^- ions intercept but insoluble for the Pb^3+ and PO4^2- when intercepting these two. In such a way, we infer that such reaction forms a precipitate of Pb3(PO4)2, lead (II) phosphate.

Regards!

4 0

3 years ago

What is the relationship between the Kuiper Belt and the status of Pluto today?

Xelga [282]

Pluto is a dwarf planet, but one of the largest known members, in the Kuiper belt.

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(1 AU = 1.5 × 10^8 km = distance from Earth to Sun).

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Astronomers class Pluto as a resonant Kuiper belt object (KBO). Because it gets so close to Neptune, its orbit is in resonance with that of Neptune. Pluto makes two orbits for every three of Neptune.

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3 years ago

True or false The mass of an electron is about equal to the mass of a proton.

pogonyaev

That is false (please mark me brainliest)

7 0

3 years ago