41. explain the difference between homogenous and heterogeneous mixtures. 42. what is the difference between atomic number of an element and its mass number? 43. the big bang theory does not try to explain how the universe was created. what does it explain? 44. why do isotopes of elements have the same atomic number but different mass numbers? 45. why does earth’s moon lack an atmosphere?

If you mix chlorine lithium and nickel together which two elements would be the most reactive

Which statement correctly describes the current in a circuit that is made up of any two resistors connected in parallel with a battery? a. the current in the battery and in each resistor is the same b. the current the battery equals to the sum of the currents in the resistors c.the current in the battery is less than the current in either resistor d. the current in the battery equals to the product of the currents in the resistors

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd a) 30 joules b) 3000 joules c) 320 joules d) 3200 joules