Which of the following is true for the endothermic reaction Ba (OH) 2 (aq) + NH4NO3 (aq) - - > Ba (NO3) 2 (aq) + 2NH3 (aq) + 2H2O (l) ?

A: H>0 S>0

B: H<0 S<0

C: H>0 S<0

D: H0

Three students wear signs with a "t" sign, representing?

What are two factors that determine an object's gravitational potential energy?

A scientist wants to perform a test that will indicate whether a nucleic acid sample is composed of RNA or DNA. Testing for the presence of which of the following is most appropriate in this situation? Answer1. thymine2. guanine3. phosphate4.

Why does 40.0 g of NaOH added to 1.00 L of water not make a 1.00 M NaOH solution

Which of the following postulates of John Dalton's modern atomic theory, published in 1800, is now known to be incorrect? a. All atoms of a particular element are identical. b. All matter is composed of tiny particles called atoms. c.

a substance that undergoes a physical change like melting is still the same substance is it true or false

What is a polar molecule

A mixture of He He, N 2 N2, and Ar Ar has a pressure of 22.1 22.1 atm at 28.0 28.0 °C. If the partial pressure of He He is 2475 2475 torr and that of Ar Ar is 1049 1049 mm Hg, what is the partial pressure of N 2 N2?

Oceans make the temperaturs of nearby land more extreme ... True or false

The Greek letter D stands for A. Mass of B. Rate of C. Change in D. Heat stored in