All categories

1 year ago

Chemistry - Atoms Unit

Chemistry

1 answer:

Allisa [31]1 year ago

8 0

1. The symbol for an isotope of lithium that has a mass of 6 and a charge of +1 is ⁶₃Li⁺

2. If the ratio of the neutron and proton in the nucleus of an atom increases, the nucleus becomes unstable.

3. Allie's hypothesis is correct because atoms B and C have the same atomic number but different neutron numbers, hence, they are isotopes.

4. Rana's hypothesis is wrong because the number of electrons is greater than the number of protons, hence atom C is a negative ion.

5. The symbols are wrong for the following reasons;

MG is wrong because the symbol of atoms consists of first a capital letter, and then a small letter
ca is wrong because the symbol of atoms consists of first a capital letter, and then a small letter
nE is wrong because the symbol of atoms consists of first a capital letter, and then a small letter

<h3>What determines the charge on an atom of an element?</h3>

The charge on an atom of an element is determined by the number of protons and neutrons in the atom.

A neutral atom has an equal number of protons and electrons, a negative atom has more electro than protons, while a positive ion has more protons than electrons.

Isotopes of elements are atoms of the same element having the same number of protons but different numbers of neutrons.

Learn more about isotopes at: brainly.com/question/27198009

#SPJ1

You might be interested in

A Rectangular Prism has a height of 4cm, a width of 5cm, a length of 1.2 cm, and a mass of 85,000 g. What is it's density?

wolverine [178]

Answer:

The answer is D.

Explanation:

Volume (V) = l x w x h

V = 4 x 5 x 1.2

V = 20 x 1.2

V = 24

Density = Mass/Volume or D = M/V

D = 85,000/24

D = 3541.66666666

4 0

3 years ago

If 155 J of heat energy is applied to a block of silver weighing 27.9 g, by how many degrees will the temperature of the silver

Brilliant_brown [7]

Answer:

The temperature of silver increase by 23.15 °C.

Explanation:

Given data:

Heat added = 155 j

Mass of silver = 27.9 g

How many degree temperature increase = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Specific heat capacity of silver is = 0.240 j/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Now we will put the values in formula.

155 j = 27.9 g × 0.240 j/g.°C × ΔT

155 j = 6.696 j/°C × ΔT

ΔT = 155 j /6.696 j/°C

ΔT = 23.15 °C

3 0

3 years ago

Identify the ion ratios needed to form neutral compounds from the ions below. The metal ion (cation) is listed first, and the no

Natasha2012 [34]

To figure out the ratios of these compounds, it is important to remember that the charge of these compounds must be neutral.

So in order to make them neutral, you must have specific ratios:

$Na^{+}: Br^{-} =1:1$ ; This is true because they both have a charge of magnitude of 1.

$Al^{3+}: Cl^{-}=1:3$ ; We need 3 chlorine atoms because we need to balance out the charge from the 3+ charge of aluminum - therefore since chlorine has a 1- charge, we need 3 atoms.

$Mg^{2+}: O^{2-}=1:1$ ; The charges of the magnesium (2+) are balanced with the oxygen charge (2-).

$Al^{3+}: O^{2-}=2:3$ ; This is correct because if charges are like this, you must find the least common factor in order to know the ratio. The LCF is 6, therefore, for the atom with a 3+ charge, you need 2 of them, and for the atom with a 2- charge, you need 3 of them. This keeps the charge neutral.

7 0

3 years ago

Read 2 more answers

Write a balanced chemical equation for the decomposition of RbNO3. Help me please!!!

nalin [4]

Answer:

2RbNO³ --> 2Rb + N² + 30²

Hope this helps!

8 0

3 years ago

An atom has an average atomic mass of about 63.5 amu. What is the chemical symbol for the atom? Consult the periodic table.

Mama L [17]

The best and most correct answer among the choices provided by your question is the fourth choice.

Copper has an average atomic mass of about 63.5 amu.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

8 0

4 years ago

Read 2 more answers