The correct answer is option B, that is, an element.
A compound comprises of either more than one kind of atom or various similar atoms. They can be dissociated or can be converted into a simpler one. An element refers to a substance that comprises only one kind of atom. It cannot be dissociated further or can be converted into simpler substance by any chemical means.
Heterogeneous mixture refers to a non-uniform mixture of distinct atoms without any chemical bonding in between them. On the other hand, homogenous mixture refers to a uniform mixture of distinct atoms with the absence of any kind of chemical bonding in between them.
Answer:
6.02 x 10²²molecules
Explanation:
Given parameters:
Mass of CO₂ = 4.4g
Unknown:
Number of molecules in CO₂ = ?
Solution:
To find the number of molecules in the given mass, we have to find the number of moles in the compound first;
Number of moles = 
Molar mass of CO₂ = 12 + 2(16) = 44g/mol
Insert the parameters and solve;
Number of moles = 
= 0.1mol
1 mole of a substance contains 6.02 x 10²³molecules
0.1 mole of CO₂ will contain 0.1 x 6.02 x 10²³molecules
= 6.02 x 10²²molecules
Chlorine is represented by the symbol Cl
Answer:
0.001moldm⁻³
Explanation:
Given parameters:
pH of carbonated drink = 3.0
Unknown:
Hydrogen ion concentration of the drink = ?
Solution
From the ionic product of water, the equation which relates hydrogen ion concentration and pH has been established. It is shown below:
pH = -log₁₀[H⁺]
we have been given the pH of the drink. Now let's go ahead and solve for the hydrogen ion concentration:
[H⁺] = inverse log₁₀ (-pH) = inverse log₁₀ (-3 ) = 0.001moldm⁻³
Answer: The new pressure is 1.34 atm.
Explanation:
Given: 
= 10.8 atm, 
= ?, 
Formula used to calculate the new pressure is as follows.
Thu, we can conclude that the new pressure is 1.34 atm.
