An empty 250 ml beaker has a mass of 60 grams. When 100 mL of oil is added, the total mass of the beaker is 140 grams.
What is the mass of the oil alone?

A 150 mL
B 40 grams
C 200 mL
D 80 grams

Which statement best describes the function of enzymes?

What does the symbol (–hfus) indicate in a phase change?

Imagine if during the cathode ray experiment, the size of the particles of the ray was the same as the size of the atom forming the cathode. which other model or scientific observation would have also been supported? 1. this would support dalton's postulates that proposed the atoms are indivisible because no small particles are involved. 2. this would support bohr's prediction about electrons moving in orbits having specific energy. 3. this would support bohr's prediction about electrons being randomly scattered around the nucleus in the atom. 4. this would support dalton's postulates that proposed that atoms combine in fixed whole number ratios to form compounds.