False, weathering is to wear away or change the appearance or texture of (something) by long exposure to the air.
Answer:
13.3 %
Explanation:
Percent by mass indicates the mass of solute in 100g of solution.
We must know the solution's mass:
Solution's mass = Solute mass + solvent mass
Solution's mass = 10 g + 65 g = 75 g
Percent by mass = (10 g / 75 g).100 = 13.3 %
Otherwise, we can make a rule of three:
In 75 g of solution we have 10 g of solute
In 100 g of solution we must have (100 . 10) /75 = 13.3 %
Answer:
The representative particle for an element is AN ATOM.
Explanation:
Representative particle of a substance refers to the smallest unit of that substance, which can not be broken down into smaller particles. The representative particles of an element is an atom, because each element is made up of atoms, which are the smallest unit of that element; they can not be broken down further.
A representative particle is chemically identical with the parent element and will have all the properties of the parent element.
Answer:
0.082L or 82mL
Explanation:
Given parameters:
Pressure of gas = 780mmHg;
760mmHg = 1atm
780mmHg = 
= 1.03atm
Volume of gas = 80ml = 0.08L
Standard pressure = 1atm
Unknown:
Volume of gas = ?
Solution:
To solve this problem, we apply Boyle's law which states that "the volume of a fixed mass of gas is inversely proportional to the pressure if the temperature is constant".
Mathematically;
P₁ V₁ = P₂ V₂
P and V are temperature values
1 and 2 are initial and final states;
Insert the parameters and solve;
1.03 x 0.08 = 1 x V₂
V₂ = 0.082L or 82mL
