Two elements are found together in a substance. They are not chemically combined. Is this substance an element, a mixture or a compound?

After watching the video "zinc strip in copper nitrate solution", and reading the instructions, click on the link labeled "start" just below the drawing of the pencil tip. follow the direction to complete the 3x3 grid. answer the below questions for the portion of the activity in which sn(s) is placed in agno3(aq)

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?