How many grams of calcium are required to free 8

grams of hydrogen gas from hydrochloric acid, HCI?

Ca + 2HCl → CaCl2 + H2

2

grams

Use the periodic table to match each of the following element symbols to its name, atomic mass, or atomic number. Match Term Definition Na A) 20.180 u (atomic mass) Ne B) 7 (atomic number) N C) Sodium

What is the concentration of the base (naoh) in this titration? select one of the options below as your answer: a. 0.88 m b. 0.47 m c. 0.48 m d. 0.97 m

What is the most stable part of the periodic table of elements

Give the chemical symbol of an element in the third period (row) of the periodic table with three valence electrons. Express your answer as a chemical symbol

True or False: Radioactivity drives plate-techtonics?

The organisms living together in a community are interdependent upon one another. Look at the food web below. In which of the following ways is a puffin dependent upon salmon? A. Puffins have a commensalistic relationship with salmon. B.

2) Which of the following is a true statement? A: All the atoms of an element must be identical. B: Compounds may be separated by physical means. C: Mixtures may not be separated. D: Homogeneous is one type of compound.

How to tell the difference between ionic and covalent bonding?

The combustion of propane may be described by the chemical equation C3H8 (g) + 5O2 (g) ⟶3CO2 (g) + 4H2O (g) C3H8 (g) + 5O2 (g) ⟶3CO2 (g) + 4H2O (g) How many grams of O2 (g) O2 (g) are needed to completely burn 83.3 g C3H8 (g) ?

Was the relationship among temperature, heat, and thermal energy?