One principle of science is that it focuses on that which exists in nature. Explanations are tested using evidence that can be
gathered in the natural world.
Select the statement(s) that meet the criteria for this scientific
principle and therefore would be appropriate for scientific
study
Remember! We can use instruments and our senses to
obtain scientific evidence in the natural world.
Planetary motion
Time travel
Ocean ecology
Atomic structure
Horoscopes
O UFOs
Bird migration

what’s the answer to this question?

more info ? ? i don't understand what the question is

explanation:

1.consider the following balanced equation and answer parts a through. show calculations for each part.  

3 ag(s) + 4 hno3(aq) → 3 agno3(aq) + no(g) + 2 h2o(l)  

a. calculate the number of moles of agno3 produced by the reaction of 3 moles of ag with excess hno3. if the number to the left of the compound represents the number of moles of the compound which are present, then 3 moles of ag react with 4 moles hno3 to produce 3 moles agno3 (aq).

so the answer to a would be 3 moles.

b. calculate the number of moles of agno3 produced by the reaction of 108 grams of ag with excess hno3.  

i'm not sure how to plug in the grams of silver into an equation using moles to find how many moles are produced.

c. calculate the number of grams of agno3 produced by the reaction of 108 grams of ag with excess hno3  

d. calculate the number of moles of no produced as a byproduct of the reaction of 108 grams of ag with excess hno3.  

e. calculate the number of grams of no produced as a byproduct starting with 108 grams of ag and excess hno3.  

explanation:

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023 

14,16 18 reacts with group