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3 years ago

Compare and contrast atoms elements compounds and molecules

Chemistry

1 answer:

N76 [4]3 years ago

6 0

atoms = smallest unit of an element

elements = contain only one type of atom

compounds = two or more elements that are chemically bound together

molecules = a group of atoms bonded together

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Compare the value you calculated for the number of sand grains on Earth’s beaches to the number of particles in a mole. What can

Wewaii [24]

Answer:

6.022×1023 particles are present in one mole of a substance while about 7.5 x 1018 grains of sand are present on earth's beaches.

Explanation:

Mole is used in chemistry for the calculation of mass of an atom. 6.022×1023 particles are present in one mole of a substance while about 7.5 x 1018 grains of sand are present on earth's beaches. According to this data which shows that the size of mole is greater than the number of sand grains present on Earth’s beaches because there are higher particles are present in mole as compared to sand grains. So the mole has big size.

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3 years ago

Read 2 more answers

An atom emits of wavelength 1.08 meters. what is the energy change occurring in the Atom due to this emission? (Planck’s constan

butalik [34]

To answer this question, we can use the following equation:

$e=\frac{h*c}{lambda}$

where e is the energy change, h is Planck's constant, c is the speed of light (m/s), and lambda is wavelength in meters. So then we can plug in the information:

$e=\frac{(6.626x10^{-34}J*s)(2.998x10^{8}\frac{m}{s})}{1.08m}$

$e=\frac{1.9865x10^{-25}J}{1.08}$

$e=1.84x10^{-25}J$

So the energy that is omitted by the atom is $1.84x10^{-25}J$ .

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3 years ago

List the three subatomic particles. Give the relative masses and charges of each.Identify the type of bond(s) present in each of

faust18 [17]

Answer:

The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.

relative charge = -1

Relative mass = 1.1836

It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.

He constructed the glass tube and create vacuum in it. He applied electric current between electrodes. He noticed that a ray of particles coming from cathode to wards positively charged anode. This ray was cathode ray.

Properties of cathode ray:

The ray is travel in straight line.

The cathode ray is independent of composition of cathode.

When electric field is applied cathode ray is deflected towards the positively charged plate.

Hence it was consist of negatively charged particles.

While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.

Relative mass of proton= 1

Relative mass of neutron = 1

Relative mass of proton = +1

Relative charge of neutron = 0

The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral.

Explanation:

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3 years ago

What is emitted during gamma radiation?

LenKa [72]

Packets of energy called gamma particles

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3 years ago

In the laboratory, hydrogen gas is usually made by the following reaction: Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq) How many liters

IrinaK [193]

<u>Answer:</u> The volume of hydrogen gas collected over water is 2.13 L

<u>Explanation:</u>