The half-life of a radioactive isotope is 20.0 minutes. What is the total amount of a 1.00-gram sample of this sample of this isotope remaining after 1.00 hour?

When solid barium oxide and aluminum are heated to a high temperature, the products are liquid barium and solid aluminum oxide.

This is a net gain or loss of electrons

Whats the meaning of life? This is a hard question to answer ... Some may think its rude to ask or they might be wondering the same thing ... Write and explain what you think it is ...

In the inheritance pattern incomplete dominance offspring demonstrate an intermediate form of alleles from the parent. True or False

Lithium has the electron arrangement 2,1. When lithium forms an ion, what will its electron arrangement be? 2,2 2 2,8 2,8,2

Four moles of hydrogen chloride (HCl) gas react with one mole of oxygen (O2) gas to produce two moles of chlorine gas (Cl2) and two moles of water gas (H2O).

The density of rubbing alcohol is 0.785g/mL at 25 Celsius. Calculate the mass of 15.0 mL of the rubbing alcohol.

Is the universe an isolated system?

1000ml of a gas is cooled from 500 K to 250 K, what is it's final volume? A. 250 ml B. 1000 ml C. 500 ml D. 750 ml E. 2000 ml

A reacton has a theoretical yield of 22.8g. When the reaction was carried out, 15.1g of the product was obtained. What is the percent yield?