Hey there!
This atom has 10 protons.
If this atom has an atomic mass of 22, that means the sum of protons and neutrons is 22.
p + n = 22
p = 10
Which makes this true:
10 + n = 22
Subtract 10 from each side to solve for n, the number of neutrons.
n = 12
An atom that has the atomic number of 10 and an atomic mass of 22 has 12 neutrons.
Hope this helps!
Answer:
<h3>The answer is 0.67 g/cm³</h3>
Explanation:
The density of a substance can be found by using the formula
From the question
mass = 10 g
volume = 15 cm³
We have
We have the final answer as
<h3>0.67 g/cm³</h3>
Hope this helps you
Answer: Formation of precipitate indicates that there has been a chemical reaction.
Explanation:
Chemical reaction: It is defined as change in arrangement of the atoms so as to form a new substance.
Mixing of two clear solutions that is lead nitrate and potassium iodide gives out yellow solid precipitate of lead iodide with aqueous solution of potassium nitrate.
The physical evidence which indicates that chemical reaction has been taken place is formation of yellow solid precipitate of lead iodide ,(
).
Answer:
0.7 moles of Ca(OH)₂ are produced.
Mass of hydrogen gas = 1.4 g
Explanation:
Given data:
Mass of water = 25.0 g
Mass of hydrogen gas produced = ?
Number of moles of Ca(OH)₂ formed = ?
Solution:
Chemical equation:
Ca + 2H₂O → Ca(OH)₂ + H₂
Number of moles of water:
Number of moles = mass/molar mass
Number of moles = 25.0 g/ 18 g/mol
Number of moles = 1.4 mol
Now we will compare the moles of water with hydrogen:
H₂O : H₂
2 : 1
1.4 : 1/2×1.4 = 0.7 mol
Mass of hydrogen gas produced:
Mass = number of moles × molar mass
Mass = 0.7 mol × 2 g/mol
Mass = 1.4 g
Now we will compare the moles of water and Ca(OH)₂
H₂O : Ca(OH)₂
2 : 1
1.4 : 1/2×1.4 = 0.7 mol
Thus, 0.7 moles of Ca(OH)₂ are produced.
Answer:
The answer to your question is: 45 electrons
Explanation:
Isotopes are molecules that have the same number of protons but the number of neutrons is different.
Also, in a neutral atom, the number of protons and electrons is the same.
In the example given, we can see that the atom is neutral so, the number of protons = 45 and the number of electrons = 45.
