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.
Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
The correct option is: Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
The procedure that could be used to demonstrate that matter is conserved during a physical change is:
Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
Explanation:
To demonstrate the conservation of matter during a physical change, you would need to compare the mass of the initial substance (in this case, a piece of ice) with the mass of the resulting substance (liquid water). By measuring the mass of the ice before it melts and then measuring the mass of the liquid water after it has completely melted, you can determine if the mass remains the same.
If the mass of the ice and the mass of the liquid water are equal, then it indicates that matter is conserved during the physical change. This means that even though the state of the substance may have changed (from solid to liquid in this case), the total amount of matter remains constant.
Therefore, the first option, which involves finding the mass of a piece of ice, letting it melt, and then finding the mass of the liquid water, would be the appropriate procedure to demonstrate the conservation of matter during a physical change.
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
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.