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Tomtit [17]
3 years ago
11

Identify the atomic number and the chemical symbol for lead, silver, and gold. drag each item to the appropriate bin.

Chemistry
2 answers:
My name is Ann [436]3 years ago
8 0

Answer :

The atomic number of lead is, 82. The chemical symbol of lead is, Pb.

The atomic number of silver is, 47. The chemical symbol of silver is, Ag.

The atomic number of gold is, 79. The chemical symbol of gold is, Au.

Explanation :

Atomic number : It is equal to the number of protons or electrons.

Atomic number = number of protons = number of electrons

Mass number : It is defined as the sum of number of protons and number of neutrons.

Number of neutrons = Mass number - Number of protons

As we know that:

Lead is a metal that belongs to group 14 and period 6. The atomic number of lead is, 82. The chemical symbol of lead is, Pb.

Silver is a transition metal that belongs to group 11 and period 5. The atomic number of silver is, 47. The chemical symbol of silver is, Ag.

Gold is a transition metal that belongs to group 11 and period 6. The atomic number of gold is, 79. The chemical symbol of gold is, Au.

andre [41]3 years ago
5 0
Lead-
<span>Atomic number: </span>82<span>Symbol: </span><span>Pb
Silver-
</span><span>Atomic number: </span>47<span>Symbol: </span><span>Ag
Gold-
</span><span>Atomic number: </span>79<span>Symbol: </span><span>Au</span>
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2 years ago
How is thermal energy transferred during conduction? Check all that apply.
Dvinal [7]

Answer:

Thermal energy is transferred between particles that are in direct contact with each other.

Thermal energy is transferred between objects of different temperatures.

Thermal energy is transferred from fast-moving particles to slow-moving particles.

Explanation:

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2 years ago
A 0.1326 g sample of magnesium was burned in an oxygen bomb calorimeter. the total heat capacity of the calorimeter plus water w
Sladkaya [172]

Answer: Th enthalpy of combustion for the given reaction is 594.244 kJ/mol

Explanation: Enthalpy of combustion is defined as the decomposition of a substance in the presence of oxygen gas.

W are given a chemical reaction:

Mg(s)+\frac{1}{2}O_2(g)\rightarrow MgO(s)

c=5760J/^oC

\Delta T=0.570^oC

To calculate the enthalpy change, we use the formula:

\Delta H=c\Delta T\\\\\Delta H=5760J/^oC\times 0.570^oC=3283.2J

This is the amount of energy released when 0.1326 grams of sample was burned.

So, energy released when 1 gram of sample was burned is = \frac{3283.2J}{0.1326g}=24760.181J/g

Energy 1 mole of magnesium is being combusted, so to calculate the energy released when 1 mole of magnesium ( that is 24 g/mol of magnesium) is being combusted will be:

\Delta H=24760.181J/g\times 24g/mol\\\\\Delta H=594244.3J/mol\\\\\Delta H=594.244kJ/mol

4 0
3 years ago
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Answer: Heat of the solution  = mass water × specific heat water × change in temperature

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H = 260 g ( 4.184J/g°C ) (5.3°C) = 5765J

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Explanation: finding molar heat requires first to look at  specific heat of water and the change of water temperature

7 0
3 years ago
What is a total ionic equation ?!
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An ionic equation contains two ions in the full equation
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