Which types of changes must follow the law of conservation of mass? (2 points) O Both physical and chemical changes
O Neither physical nor chemical changes
O Only physical changes
O Only chemical change

Imagine that you’re getting ready to move to a new city. when people move, they are influenced by push factors and pull factors, and you have many reasons for your move. which of the following factors is an example of a pull factor? a. wanting to move because you’ve found a great new school somewhere new b. needing to move because there are not enough resources in your old hometown c. being forced to move because your old home is gone d. having to move because there are no jobs in your current hometown

Write a hypothesis that answers the lesson question, “while observing a chemical reaction, how can you tell which reactant is limiting? ” hypothesis: if a substance is the limiting reactant, then . . because . .

Acamcorder has a power rating of 17 watts. if the output voltage from its battery is 7 volts, what current does it use?units: