Ascientist conducts a chemical reaction. at the beginning of the reaction, she combines 5.4 grams of the first reactant and 6.3 grams of the second reactant. she runs the reaction in a closed chamber and heats only the reaction. a small amount of gas is produced. what can you conclude about the total mass of the substances present when the reaction is complete?

If it's in a closed chamber, the gas would not escape and the products would weigh the same as the reactant before the reaction since law of conservation of matter would take place. However, there might be an insignificant loss of the product since its difficult to measure the weight of the product in such reaction.

Explanation:

pie chart because it is in percents ( % )

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them