Which of the following is used to determine the true color of a mineral? luster, cleavage, hardness, streak

Ibeg i need 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?

Which diagram represents the phase tha occurs after a solid melts?

If you try to move a piano and are unable to move it, did you perform any work in the scientific sense of the word? yes no correct anwser get brainliest