Which statement is true if the (triangle here) Hrxn of a reaction is positive?

The reaction is endothermic.

The reaction is exothermic.

There is more reactant than product.

There is more product than reactant.

Which of the following is not a part of Earth's system? a. hydrosphere b. geosphere c. biosphere d. chronosphere

The family of elements that has a 2 - oxidation number is the:

If a balloon containing 1,200 L of gas at 25°C and 760 mmHg pressure ascends to an altitude where the pressure is 380 mmHg and the temperature is 54°C, the volume will be: (Be sure to use the correct number of significant figures.)

Given M1V1 = M2V2 How many L of a 4.37 M Ca (OH) 2 solution must be diluted with water to make a 2.33-L solution with a concentration of 0.755 M?

What are chemical properties of minerals?

Ocean constitutes most of ___ of water a) Evaporation b) Precipitation c) Condensation d) Transpiration e) Sublimation Don't choose a random letter.

In the reaction, Zn + HCl-> ZnCl2 + H2, 25 grams Zn are reacted with 17.5 grams HCl. How many grams of H2 will be produced? A. 0.382 g of H2 B. 0.479 g of H2 C. 0.7865 g of H2 D. 0.484 g of H2

Is nail varnish soluble?

What is the periodic trend for atomic size from top and bottom in a group? From left to right in a period?

Which planets' orbits is the belt located between the main asteroid belt?