Is turning something anhydrous endo or exothermic?

Which of the following is not a redox reaction? A. H2O (l) + NH3 (g) LaTeX: / longrightarrow NH4 + (aq) + OH - (aq) B. 2H2 (g) + O2 (g) LaTeX: / longrightarrow 2H2O (l) C. Zn (s) + H2SO4 (aq) LaTeX: / longrightarrow ZnSO4 (aq) + H2 (g) D.

Nicolaas constructed a working model of the hydrologic cycle during science class. He used an open flame, liquid water, two large glass bulbs, and some glass tubing. Which of the following processes does Nicolaas' model demonstrate?

An atom of potassium-37 and an atom of potassium-42 differ in their total number of (1) electrons (3) protons (2) neutrons (4) positrons

Calculate the value of K p for the equation C (s) + CO 2 (g) - ⇀ ↽ - 2 CO (g) K p = ? given that at a certain temperature C (s) + 2 H 2 O (g) - ⇀ ↽ - CO 2 (g) + 2 H 2 (g) K p 1 = 3.23 H 2 (g) + CO 2 (g) - ⇀ ↽ - H 2 O (g) + CO (g) K p 2 = 0.693

What is the number of neutrons in an atom with atomic mass of 35, three energy levels, and 7 valence electrons?

Drinking water may contain a low concentration of lead ion (Pb2) due to corrosion of old lead pipes. The EPA has determined that the maximum safe level of lead ion in water is 15 ppb.

A student examines the temperature and precipitation on a given day using a thermometer and a rain gauge. The student is measuring- A. temperature only B. climate only C. wind speed only D. specific weather conditions

Atoms - 1 2 3 4 Protons - 8 10 9 8 Neutrons - 10 9 9 11 Electrons - 8 10 9 8 Which two are isotopes of one another?

A radioactive isotope has the same number of protons as its stable parent atom, but differs in its number of what?

A student experimentally obtained the density of osmium the densest element as 22.57g/cm3 the density of osmium is reported to be 22.48 g/cm3 determine the student percent error