Scientists classify rocks into three different types. What is the main basis for the classification system they chose? color of the rock shape of the rock how the rock formed who discovered the rock

Consider the titration of 100.0 mL of 0.280 M propanoic acid (Ka = 1.3 ✕ 10-5) with 0.140 M NaOH. Calculate the pH of the resulting solution after each of the following volumes of NaOH has been added. (Assume that all solutions are at 25°C.) (a) 0.

How much force is required to lift a 100kg barbell with an acceleration of 3 m/s2?

A student fills a paper cup with water and puts in a freezer overnight. When she takes the cup out the next day, she notices that the sides of the cup are pushed out. Why did this happen?

Cooking chicken in a oven is physical change or chemical change

Cuo+h2 cu+h2o which is the reducing agent

A 1.8-mL volume of seawater contains about 4.0 * 10^-10 g of gold. The total volume of ocean water is about 1.5 * 10^21 L. Calculate the total worth of all the gold in the world's oceans if the price of gold is $19.

Why are numbers placed before the elements and molecules in a chemical equation?

Which of these pairs of elements have the same number of valence electrons? oxygen (O) and bromine (Br) selenium (Se) and bromine (Br) carbon (C) and lead (Pb) oxygen (O) and carbon (C) sodium (Na) and magnesium (Mg)

A mixture of helium, neon, and xenon gases is made with the same mass of each gas. Which (if any) gas will have the highest partial pressure? a. They will all have the same partial pressure b. Xe c. He d. Ne

5.0 g of copper was heated from 20 degrees Celsius to 80 degrees Celsius. How much energy was used to heat Cu (specific heat capacity of Cu is 0.092 cal/g degrees Celsius)