Hook was the first to discover cells in a cork. true or false?

How many moles of oxygen are in 25.45 g of caco3?

Which of the following best describes how further studies supported Joseph Proust's discovery about proportion of elements in water? Max Planck discovered the Planck's constant. John Dalton proposed that matter is made of tiny particles.

Barium is a very reactive metal in the presence of oxygen and water, thus its density cannot be measured by water displacement. Instead, mesitylene (C9H12, density = 0.86370 g/mL (at 20 o C)) is used. 77.

A young man sets a goal to compete in a marathon in two weeks. He started training last week by exercising three to four times a week with his friend.

If you knew the number of valence electrons in a nonmetal atom, how would you determine the valence of the element?

Why are elements organized in the same group or families

Iron Man died in Infinity Wars, so Mrs. Nogaki has decided that she is going to make her own super hero suit to save the world. She has decided that her suit must have these properties.

How many atoms of oxygen are there in one molecule of carbon dioxide, if the chemical formula is CO2? 0 1 2 3

The speed of a chemical reaction a. is constant no matter what the temperature is. b. is independent of the amount of contact surface of a solid involved. c.

Find the de Broglie wavelength (in nm) associated with an electron that is moving with a velocity of 5230 km/s. The electron rest mass is 9.11 x 10⁻³¹ kg.