In late 18th century, people wore rubber soled shoes called plimsolls, but they weren't the best sneakers. Around 1892, a US company named Keds started sneakers with a canvas top and rubber soles. By 1917, these were mass produced.
Answer:
41.9 g/ mol hope that helps you out
Explanation:
d=p.m/ r.t
Answer:
question 1: 3
question 2: the number of Valence electrons in the atom
hope it helps
Answer:
B. A chemical change occurred which caused the liquid's physical properties to change.
Explanation:
The reduction of the temperature of the system meant that the reaction absorbed heat energy from it. This shows that a chemical reaction was in progress. New products were formed, and this is proved by the change in the color to blue.
Answer is 3
because on the periodic table, the small number above every element is the number of protons
