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3 years ago

Helllpppppppppp plsssssss

Chemistry

1 answer:

Vika [28.1K]3 years ago

7 0

Answer:

Option B is correct.

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. The number of protons or neutrons is the atomic number of an atom while sum of proton and neutrons is the mass number.

The beryllium atom have five neutrons, four protons and four electrons.

The option be is correct model of beryllium because it shows that there are four protons and five neutron in nucleus of beryllium atom and four electrons revolving around the nucleus.

Beryllium is alkaline earth metal.

It is present in group two.

Its atomic number is 4.

its atomic mass is 9 amu.

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Which formula can be used to find velocity if kinetic energy and mass are known?

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$v = \sqrt{ \frac{2ke}{m} }$

option D is the correct option.

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If an object of mass 'm' moving with a velocity'v' then,

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2 years ago

Consider the following reversible reaction.

dmitriy555 [2]

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Keq = [CO₂]/[O₂]

Explanation:

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2 years ago

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If you put 1000 J of heat energy into a bar of titanium and the bar's temperature rose

melisa1 [442]

Answer:

The mass of the bar is approximately 0.33 g.

Explanation:

q (heat in joules) = 1000 J

c (specific heat capacity) = 52 J/g°C

ΔT (change in temperature) = 80 - 22 = 58°C.

m (mass in grams) = ?

m = q / cΔT

m = 1000 J / (52 J/g°C) (58°C)

m = 0.33 g

hope this helps and is right!! p.s. i really need brainliest :)

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1 year ago