How does the law of conservation of mass apply to this reaction: mg + hcl → h2 + mgcl2 ?

the law of conservation of mass has already been applied. there is an equal number of each element on both sides of the equation.

only the hydrogen needs to be balanced. there are equal numbers of magnesium and chlorine.

the equation needs to be balanced. there are fewer hydrogen atoms in the equation than magnesium or chlorine.

hydrogen and chlorine need to be balanced. there is an equal amount of magnesium on each side

Imagine you work as a consultant, and your daily job involves listening to the constructive criticism of others. as part of your job, you must listen to opposing viewpoints to make important decisions. in this activity, you are a consulting dam engineer. you must make a decision about four different dams; should they be repaired, taken down, or left alone? you will listen to contrasting opinions about what should be done with the dams before you make the final decision. as the consulting dam engineer, what do you decide to do with this dam? explain your reasoning. by making your decision, did you support the opinions of the mayor and/or the dam safety official? why or why not? (site 1)

Which is an example of gaining a static charge by conduction? a) rubbing a balloon against your hair. b) shuffling your shoes across a carpet. c) bringing a charged rod near an electroscope. d) touching your car on a cold day and getting a shock.

Which of the following is an example of units for speed