Which procedure could be used to demonstrate that matter is conserved during a physical change?(1 point)
Responses
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 raw egg. Cook the egg. Find the mass of the cooked egg.
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 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.
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
six
six
four
four
three
three
two
three
The correct response is:
Find the mass of a cup of water. Boil the water. Find the mass of the water that remains.
To demonstrate that matter is conserved during a physical change, you can use the procedure of finding the mass before and after the change. This is based on the law of conservation of mass, which states that matter cannot be created or destroyed, only rearranged.
Here are the steps for each procedure:
1. Find the mass of a cup of water. Boil the water. Find the mass of the water that remains.
- Weigh the cup of water using a balance or a scale.
- Boil the water until it completely evaporates.
- Weigh the empty cup to measure the mass of the remaining water.
- If the mass after boiling is equal to the initial mass, it demonstrates conservation of matter.
2. Find the mass of a raw egg. Cook the egg. Find the mass of the cooked egg.
- Weigh the raw egg using a balance or a scale.
- Cook the egg through any desired method (boiling, frying, etc.).
- Weigh the cooked egg to measure its mass.
- If the mass after cooking is equal to the initial mass, it demonstrates conservation of matter.
3. Find the mass of an apple. Cut the apple and remove the core. Find the mass of the remaining apple.
- Weigh the whole apple using a balance or a scale.
- Cut the apple into pieces and remove the core.
- Weigh the remaining parts of the apple.
- If the mass of the remaining apple is equal to the initial mass, it demonstrates conservation of matter.
4. Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
- Weigh the piece of ice using a balance or a scale.
- Allow the ice to melt completely, either at room temperature or with the help of heat.
- Weigh the water that results from the melted ice.
- If the mass of the water is equal to the initial mass of the ice, it demonstrates conservation of matter.
In all these procedures, if the mass before and after the physical change remains the same, it provides evidence for the conservation of matter.