An unknown substance can be identified by

its mass.

a flame test

its density

B and C

How many problems are in an element with an atomic number of 8 and a mass number of 18?

Physical and chemical change worksheet

Which characteristic of a substance is considered a chemical property

Express glucose in terms of atom ratio and mass ratio

Calculate the mass of 4.50 moles of Ca3 (PO3) 4

Which of the following transitions would release energy? n=2->n=3 n=1 - > n=3 n=3 - >n=1 n=3->n=2

Which animal group actually saw a drop in the number of endangered and threatened species between 1995 and 2005? a Fish b. Reptiles c. Birds d. Mammals

Why does burning fossil fuels put ecosystems under pressure?

What is the quantum number set of the ground-state electron that is found in helium (He) but not in hydrogen (H) ? (1, 0, 0, - ½) (1, 0, 1, - ½) (1, 1, 0, - ½) (1, 1, 1, - ½)

What must be true in order for magnetism to induce an electric current in a wire? There needs to be a switch in the circuit. There cannot be a switch in the circuit. The wire must be part of a closed circuit. The wire must be part of an open circuit.