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
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Answer:
50g
Explanation:
At the end of the burning process, the mass of the jar and smoke should be 50g after the candle burning is done.
In most systems, the law of conservation of matter finds expression. According to this law "matter is neither created nor destroyed but atoms are rearranged".
In this kind of system, no matter is allowed to escaped and the starting mass of the reactants compared to that of the product will be the same.
Ammonium hydroxide aka ammonia is a colorless gas that smells awful.... ammonia contains nitrogen and hydrogen.... and also ammonia is used as a lifting gas, which means it cans be used to lift hot air balloons.... lol that was just a weird fact..... but have an amazing day/night and god bless u!
Answer:
A) 900 J
B) 27.96 J
C) 1,628 J ≅ 1.63 kJ
Explanation:
The heat absorbed by the metal (silver) - or energy required to heat it - is calculated as:
heat = mass x Cp x ΔT
Where Cp is the heat capacity (0.24 J/°C ·g) and ΔT is the change in temperature (final T - initial T).
A) Given:
mass = 150.0 g
final T = 298 K = 25°C
initial T = 273 K = 0°C
We calculate the energy in J to raise the temperature:
heat = mass x Cp x (final T - initial T)
= 150 .0 g x 0.24 J/°C ·g x (25°C - 0°C )
= 900 J
B) Given:
moles Ag= 1.0 mol
ΔT = 1.08°C
We first calculate the mass of silver (Ag) by multiplying the moles of Ag by the molar mass of Ag (MM = 107.9 g/mol)
mass = moles x MM = 1.0 mol Ag x 107.9 g/mol Ag = 107.9 g
Then, we calculate the heat required:
heat = mass x Cp x ΔT = 107.9 g x 0.24 J/°C ·g x 1.08°C = 27.96 J
C) Given:
heat = 1.25 kJ = 1,250 J
final T = 15.28°C
initial T = 12.08°C
We first calculate the change in temperature:
ΔT = final T - initial T = 15.28°C - 12.08°C = 3.2°C
Then, we calculate the mass of silver:
mass = heat/(Cp x ΔT) = 1,250 J/(0.24 J/°C ·g x 3.2°C) = 1,628 J ≅ 1.63 kJ
Explanation:
Electric conductors are the substances which allow easy passage of electric charges from one atom to another in the presence of a certain amount of voltage.
A conductor in which electric charge passes easily is known as a good conductor. Whereas a conductor in which electric charge passes with difficulty or no electric charge passes through is known as bad conductor.
For example, copper is good conductor of heat and electricity as it conducts flow of current quite easily.
