What is the metal with 4 valence

electrons and a mass greater than 200?

A 40 g gold coin is cooled from 50°C to 10°C (CAu is 0.13 J/g-° c. What is the H? 325 J 208 J + 208 J

How many grams of calcium are required to free 8 grams of hydrogen gas from hydrochloric acid, HCI? Ca + 2HCl → CaCl2 + H2 2 grams

An alkaline battery produces electrical energy according to the following equation. Zn (s) + 2 MnO2 (s) + H2O (l) Zn (OH) 2 (s) + Mn2O3 (s) (a) Determine the limiting reactant if 17.5 g Zn and 31.0 g MnO2 are used.

Which of the following is an example of an empirical formula? * A. C9H18CI3 B. C2H202 C. C8H12 D. N205

The bond between which two atoms has the greatest degree of polarity

Determine the relative formula mass of glucose (C6H12O6) using the periodic table below. A. 29.1 g/mol B. 24.0 g/mol C. 15.0 g/mol D. 180.1 g/mol

How many moles of potassium chloride are in 28 grams of KCl? A.).265 mole KCl B.).856 mole KCl C.).376 mole of KCl (think it's this but idk) D.) 1.2 mole KCl

An unknown liquid has a pH lower than 7, conducts electricity poorly, and tastes sour, what kind of solution is the unknown?

Five beans have a mass of 2.1 g. How many beans are in 0.454 kg of beans.

As the temperature of a liquid goes up, the average speed of its particles. This means that the kinetic energy of the particles