Which of the following statements is true? an element is made of only one type of atom. positively charged atoms have gained protons. a molecule must be made of two or more elements. electrons and neutrons are found in the nucleus of an atom.

The true statement is

An element is made of only one kind of atom.

Explanation:

An element is made of only one kind of atom. For example if we take element carbon it  is made of carbon atoms only .

The other atatements are false.

Positively charged atoms lose electrons and don't gain electrons.

A molecule can also be made of two or more  atoms of the same element. Eg H₂, P₄, Cl₂ etc.

Protons and neutrons are found in the nucleus of the atom and electrons are present outside the nucleus.

hey there!

boiling point is the temperature at which the vapor pressure of the liquid equals atmospheric pressure. the vapor pressure of solvent molecules is decreased when a solute is added, so a higher temperature is required to increase the number of solvent molecules in the gas phase above the liquid.

at the freezing point, the vapor pressures of the solid and liquid are equal; a lower temperature is needed to reduce the number of solvent particles above the liquid.

hope this you

tobey

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml