Sally's teacher tells her to find the masses of a sugar cube and a glass of water. Sally finds the masses to be 10 g for the sugar cube and 100 g for the glass of water. Then, the teacher tells her to put the sugar cube into the water. Sally puts the cube into the glass of water and watches as it dissolves. Then, the teacher tells Sally to estimate the new mass of the glass of sugar-water.

Question

What should Sally guess as the new mass of the glass of sugar-water?
A.
200 g
B.
90 g
C.
110 g
D.
50 g

Answer 1

To find the mass of the glass of sugar-water after the sugar cube dissolves, Sally can simply add the mass of the sugar cube to the mass of the glass of water.

The mass of the sugar cube is 10 g, and the mass of the glass of water is 100 g.

So, the total mass of the glass of sugar-water is:

100 g (mass of water) + 10 g (mass of sugar) = 110 g.

Therefore, Sally should guess that the new mass of the glass of sugar-water is C. 110 g.