Friction occurs when two surfaces come into contact. Excess friction hinders movement, and it wastes energy. Friction refers to a force that opposes motion. It is important because it is applied in almost all life processes.
Answer:
6.27 [gr].
Explanation:
the required mass can be calculated as:
m[Ca(OH)₂]=M[Ca(OH)₂]*m[CaCl₂]/M[CaCl₂], where M - molar mass [gr/mol], m - mass [gr];
m[Ca(OH)₂]=9.4*74/111≈6.2(6) [gr].
B. a physical combination of two or more different materials.
Answer: If more than one variable is changed in an experiment, scientist cannot attribute the changes or differences in the results to one cause. By looking at and changing one variable at a time, the results can be directly attributed to the independent variable.
Answer:
only 2.5 grams will be present after 16 years have passed
