In the data table, distance is measured in meters and time is in seconds. Calculate the man’s average velocity using the equation: PLS ANSWE 50 POINTSS!!

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.