Answer:
By adding heat energy
It changed to gas
Explanation:
A substance whose molecules are moving around each other is a liquid. They are held in shape by very weak intermolecular forces.
For solids, there is no movement because the molecules are held up in a fixed lattice.
Gases molecules moves randomly and independently of one another.
- When a liquid is heated and it gains heat energy, it changes phase.
- A phase change to gas can be predicted.
- This is because there is an increase in the speed of the substances.
Answer:
The new volume of the gas is 70 mL (option A)
Explanation:
Step 1: Data given
Volume of the gas = 93 mL = 0.093 L
Temperature = 91 °C = 364 K
The temperature is reduced to 0°C = 273 K
The pressure doesn't change
Step 2: Calculate the new volume of the gas
V1/T1 = V2/T2
⇒with V1 = the initial volume of the gas = 0.093 L
⇒with T1 = the initial temperature of the gas = 364 K
⇒with V2 = the new volume = TO BE DETERMINED
⇒with T2 = the reduced temperature = 273 K
0.093L/364K = V2/273 K
V2 = 0.06975 L = 69.75 mL ≈ 70 mL
The new volume of the gas is 70 mL (option A)
Answer:
Theoretical moles of V are 1.6 moles
Explanation:
The theoretical yield of a reaction is defined as the amount of product you would make if all of the limiting reactant was converted into product.
In the reaction:
V2O5(s) + 5Ca(i) → 2V(i) + 5CaO(s)
Based on the reaction, 1 mol of V2O5 needs 5 moles of Ca for a complete reaction. As there are just 4 moles, <em>limiting reactant is Ca.</em> As there are produced 2 moles of V per 5mol of Ca, Theoretical moles of V are:
4 moles of Ca × (2mol V / 5Ca) = <em>1.6 moles of V</em>
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I hope it helps!
halogens
Group 7A (or VIIA) of the periodic table are the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).