How to tell if a reaction is endothermic or exothermic by looking at it?

Enrico orders some hot chocolate at a fast food restaurant. the cup is very hot. which material would be best to wrap around the cup to protect his hand from getting too hot A. Paper B. Plastic Wrap C. Foam D. Aluminum Foil

How many molecules are there in 1.80 kg of hydrazine, n2h4?

Would elements in the same family (group) make similar compounds?

Which of these is a baseball?

What elements could replace iron in a compound

Which statements about the formation of the solar system are true and in a correct order? A. A black hole collapsed to form the sun; small planetary objects formed; small planetary objects collided with each other to form larger objects. B.

Which is an important step in the alternate method for balancing equations in redox reactions? a) indicating the types of bonds found in the molecules. b) determining the speed at which reactions take place.

How many moles of NH3 can be produced from 24.0 mol of H2 and excess N2

An ecosystem contains all the biotic and abiotic factors in an area. answers true or false

For the reaction n2 (g) + 2h2 (g) â n2h4 (l), if the percent yield for this reaction is 77.5%, what is the actual mass of hydrazine (n2h4) produced when 27.70 g of nitrogen reacts with 4.45 g of hydrogen?