1. 0.45 grams of potassium carbonate was mixed with 0.30 g of an unknown substance. What is the total mass of the mixture?

Phase changes are chemical changes. true or false

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c

This punnett square shows the cross between two pants. one parent has round seeds (rr). and the other parent has wrinkled seeds (rr) which best describes their offspring as shown in this cross?