The "hardness" of water is usually expressed as parts per million (ppm) by mass of caco3. what is the molar concentration of ca+2 ions in a water sample with a hardness count of 175 ppm?

A tiny pencil mark just visible to the naked eye contains about 3 * 1017 atoms of carbon. what is the mass of this pencil mark in grams?

Which atom would tend to lose one valence electron to another another atom in order to become stable?

What is the hydroxide ion concentration for muriatic acid (has a pH of 2.5) ?

Sin^4x+2sin^2x-3=0 find interval [0,2pie)

Which of these are equal to 3.01 x 1023 particles 76.9 g of diatomic iodine (I2) 79.9 g of diatomic bromine (Br2) 6 g of carbon (C) 13.01 g of carbon tetahydride (CH4)

580 grams of boiling water (temperature 100°C, specific heat capacity 4.2 J/K/gram) are poured into an aluminum pan whose mass is 900 grams and initial temperature 24°C (the specific heat capacity of aluminum is 0.9 J/K/gram).

Why are noble metals for example Rhodium, Palladium, Platinum, and Iridium largely used in chemical manufacturing as heterogeneous catalyst?

If displacement is decreasing, then velocity is:

True or false an example of a theory is Newton's theory of gravity

What is a molecule with atoms from two or more different elements?