50g of water is placed into a beaker. the mass of the beaker is now 115g. what is the mass of the empty beaker?

Which of the following is an example of a longitudinal wave

How many molecules of hydrogen will be required to react completely with 0.600 mol of o2 in order to form water?

Metals bond with halogens to form colorless metal halides. During an experiment, chlorine water was added to a solution of sodium iodide. A record of the experiment is shown.

How many ml of 0.0500 m cacn2 are needed to make 25.0 ml of 0.0150 m solution? The molar mass of cacn2 is 80.11 g/mol.

How many numbers are there in the periodic table

Calculate the amount of HCN that gives the lethal dose in a small laboratory room measuring 12.0 ft*15.0 ft*8.60ft.

A certain ore is 34.4% nickel by mass. How many kilograms of this ore would need to dig up to have 30.0g of nickel?

Are the chemical reactions that take place when a battery connected endothermic or exothermic

What are 3 properties of carbon?

A (1. pathogen 2. Germ 3. Bacterium) is an agent that causes disease. All (1. bacteria 2. fungi 3. Viruses) are pathogens.