49.which of the following statements regarding chemical equilibrium is true?

equilibrium is shown with a single arrow and/or an equal sign.

a system at equilibrium maintains the concentrations of all reactants/products over time.

a system at equilibrium stops.

equilibrium is signified only with an equals sign.

What type of matter is made of only one kind of atom

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false

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.