Tijuan mixod a solid and a liquid togother in a beaker He determined that a chomical change occurred. If his conclusion is correct, which substances could he have been observing and why? ice mixed into warm oil, because the change of state that occurred when the ice melted cannot be reversed baking soda mixod into vinegar, because the production of bubbles indicates that a now substance formed sugar mixed into hot water, because the disappearance of solid indicates that the chemical identity of the sugar changed sand mixed into water because when sand was added the mass of the beaker increased

## Step 1<br />The problem is asking us to identify which substances could have been mixed together in the beaker to cause a chemical change. A chemical change is a process where one or more substances are transformed into new substances with different properties.<br /><br />## Step 2<br />Let's evaluate each option:<br /><br />### Option A: Ice mixed into warm oil<br />This is a physical change, not a chemical change. The ice melting is a change of state, which is a physical change, not a chemical change.<br /><br />### Option B: Baking soda mixed into vinegar<br />This is a chemical change. When baking soda (a base) reacts with vinegar (an acid), it produces carbon dioxide gas, water, and sodium acetate. This is a classic example of an acid-base reaction, which is a chemical change.<br /><br />### Option C: Sugar mixed into hot water<br />This is a physical change, not a chemical change. The sugar dissolving in water is a physical change because the sugar molecules are not chemically altered.<br /><br />### Option D: Sand mixed into water<br />This is a physical change, not a chemical change. The sand dissolving in water is a physical change because the sand molecules are not chemically altered.