A, true is the answer and cluke u help me please
Answer:
A.
Explanation:
The sun unevenly hits the Earth, causing wind to form and move around the poles; never constant.
The subscript 2 in the formula o2 indicates that there are 2 atoms of the element oxygen, represented by the symbol "O." The subscript to the right of the symbol tells how many atoms are present of that element.
Unit ppm stands for parts per million. in terms of mass, ppm is equivalent to mg/kg.
since 1 kg is 10⁻⁶ mg, 1 kg is equivalent to million mg.
therefore mg/kg is also ppm.
there are 1.3 g of Ca ions in 3100 kg
if 3100 kg contains - 1.3 g of Ca
then 1 kg contains - 1.3 g / 3100 kg
then Ca ions - 0.42 x 10⁻³ g/kg
Ca ion concentration - 0.42 mg/kg
therefore Ca ion concentration is 0.42 ppm
Answer: colloid
Explanation: The colloid is a mixture in which particles from one substance is suspended into particles of another substance. The particles of the colloids remain dispersed and they do not settle at the bottom of the container. The mixture appear in cloudy appearance. The particles of the mixed substances cannot be separated from each other in a colloidal mixture.
On the basis of the above description, and comparing the features of the skin lotion this can be said that the lotion is colloidal mixture.
