What is the mass of a sample of copper that contains 4.78 x 1023 atoms?

Which of the following compounds does not contain molecules? question 2 options: co2 h2 nacl h2o

In an exothermic reaction, energy may be released to the surroundings in the form of question 4 options: heat light thermal all of the above

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.