What do these two changes have in common? dry ice sublimating and becoming a gas snowflakes forming in a cloud Select all that apply. Both conserve mass. Both are changes of state. Both are chemical changes. Both are caused by heating.

## Step 1<br />The problem presents two changes: dry ice sublimating and becoming a gas, and snowflakes forming in a cloud. We need to identify the commonalities between these two changes.<br /><br />## Step 2<br />The first change, dry ice sublimating and becoming a gas, is a physical change where solid carbon dioxide (dry ice) changes directly into a gas without becoming a liquid. This is a change of state from solid to gas.<br /><br />## Step 3<br />The second change, snowflakes forming in a cloud, is a physical change where water vapor in the air cools and changes into a solid state, forming snowflakes. This is also a change of state from gas to solid.<br /><br />## Step 4<br />Both of these changes are physical changes, not chemical changes. They do not involve the formation of new substances, but rather the change of state of the same substance.<br /><br />## Step 5<br />Both of these changes conserve mass. In a physical change, the mass of the substance does not change. The mass of the substance before the change is equal to the mass of the substance after the change.<br /><br />## Step 6<br />Neither of these changes are caused by heating. Dry ice sublimates at a temperature below the freezing point of water, and snowflakes form when water vapor cools and changes into a solid state.