By Pleistocene ice age is meant the glacial periods that appeared in the Pleistocene. The Pleistocene is the first epoch of the Quaternary. It is an epoch when there was a so called ''ice age'' on the Earth, or rather a glacial period. During this ice age the planet had much lower temperatures on a global scale. The climate was also much drier. Lot of ocean water was frozen in the ice sheets that were stretching deep into the North American and Eurasian continents, which resulted in much lower sea levels that today as well. The places further north than 40 degrees of latitude were almost exclusively covered with ice, so life was almost impossible apart from some coastline places.
b. products, reactants
c. elements, atoms
d. reactants, products
The answer is letter D. Reactants, Products
B) 2 g of hydrogen gas were produced.
C) Kay didn't correctly mass the precipitate.
D) Kay didn't collect all of the precipitate.
Answer: B) 2 g of hydrogen gas were produced.
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
Given: mass of reactants = mass of zinc + mass of hydrochloric acid = 65 g + 30 g = 95 g
Mass of products = Mass of zinc chloride + mass of hydrogen
As we know , mass of reactants = mass of products
Mass of zinc chloride + mass of hydrogen = 95 g
Given : Mass of zinc chloride = 93 g
93 g + mass of hydrogen = 95 g
mass of hydrogen = 95 g - 93 g = 2 g
Thus 2 g of hydrogen gas were produced.
Answer:
B) 2 g of hydrogen gas were produced.
Explanation:
Metals and acids react to form a salt and hydrogen gas, so this is the most likely explanation.