Which procedure could be used to demonstrate that matter is conserved during a physical change?(1 point)
Responses
Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
Find the mass of an apple. Cut the apple and remove the core. Find the mass of the remaining apple.
Find the mass of an apple. Cut the apple and remove the core. Find the mass of the remaining apple.
Find the mass of a cup of water. Boil the water. Find the mass of the water that remains.
Find the mass of a cup of water. Boil the water. Find the mass of the water that remains.
Find the mass of a raw egg. Cook the egg. Find the mass of the cooked egg.
3 answers
Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
One molecule of bromine (Br2) and two molecules of potassium chloride (KCl) combine in a reaction. How many atoms are in the products?(1 point)
Responses
four
four
three
three
six
six
two
Responses
four
four
three
three
six
six
two
The correct answer is: six.
In the reaction between one molecule of bromine (Br2) and two molecules of potassium chloride (KCl), the bromine molecule will split into two individual bromine atoms (2 Br). The two potassium chloride molecules will dissociate into two potassium ions (2 K+) and two chloride ions (2 Cl-).
Therefore, in total, there will be 2 bromine atoms (2 Br) plus 2 potassium atoms (2 K) plus 2 chloride atoms (2 Cl). This totals to 6 atoms in the products.
In the reaction between one molecule of bromine (Br2) and two molecules of potassium chloride (KCl), the bromine molecule will split into two individual bromine atoms (2 Br). The two potassium chloride molecules will dissociate into two potassium ions (2 K+) and two chloride ions (2 Cl-).
Therefore, in total, there will be 2 bromine atoms (2 Br) plus 2 potassium atoms (2 K) plus 2 chloride atoms (2 Cl). This totals to 6 atoms in the products.
3 answers