The density of lead is 11.3

g/mL

. The water level in a graduated cylinder initially at 206

mL

rises to 287

mL

after a piece of lead is submerged. What is the mass in grams of the lead?

The number of protons in an atom is called the what?

How many moles of CO2 can be produced by the complete reaction of 1.0 g of lithium carbonate with excess hydrochloric acid (balanced chemical reaction is given below) ? Li2CO3 (s) + 2HCl (aq) - -> 2LiCl (aq) + H2O (l) + CO2 (g) Question 1 options: 1.

Douglasite is a mineral with the formula 2KCl • FeCl2 • 2H2O. Calculate the mass percent of douglasite in a 455.0-mg sample if it took 37.20 mL of a 0.1000 M AgNO3 solution to precipitate all the Cl2 as AgCl.

N an exothermic reaction, what is true of the enthalpy? A. It has increased. B. It has decreased. C. It has remained unchanged. D. It has, at minimum, doubled.

C5H6 reacts with itself to form C10H12 according to the following process

Which statement describes a concept included in the wave-mechanical model of the atom? 1. Positrons are located in shells outside the nucleus. 2. Neutrons are located in shells outside the nucleus. 3.

The process by which rocks are broken down into smaller fragments by the atmosphere and other factors in the environment is called?

What happens when a given amount of gas at a constant temperature increases in a volume?

Specific volume is the term used to indicate the space a weight of gas will occupy. A. True B. False

Which is part of the niche of the American pikas? A. They climb mountains. B. They feed on dead organisms. C. They build nests far out on tree limbs. D. They find shelter between rock fragments.