How is a pure substance different from a mixture

Above what temperature does the following reaction become nonspontaneous? 2 H2S (g) + 3 O2 (g) → 2 SO2 (g) + 2 H2O (g) ΔH = - 1036 kJ; ΔS = - 153.2 J/K

What is the number of atoms per unit cell for each metal?

How many moles of s are needed to combine with 0.208 mol al to give al2s3?

An atom in the ground state has two electrons in its first shell and six electrons in its second shell. What is the total number of protons in the nucleus of this atom? (1) 5 (2) 2 (3) 7 (4) 8

3. Which two continents are experiencing the most rapid population growth?

When a counterfeit detection pen is used on an authentic bill, what color does it turn? a. Pale blue b. Pale yellow c. Blue-black d. Pale pink

Why are the outer-most electrons the only ones included in the electron dot diagram?

What is the relationship between law of conservation and chemical reaction?

How quickly must non-frozen ready-to-eat foods be consumed? 24 hours . 48 hours . 3 days . 7 days

I need a essay on what I learned in chemistry