A beta particle may be spontaneously emitted from

(1) a ground-state electron

(2) a stable nucleus

(3) an excited electron

(4) an unstable nucleus

Which of the following is the best way to separate sugar from water? a. decanting b. boiling c. filtering d. distilling

210.0 °C a gas has a volume of 8.00 L. What is the volume of this gas at - 23.0°C?

How many kilojoules are absorbed when 0.772 mol of N2 (g) reacts? N2 (g) + 2NO (g) → 2N2O (g) ΔH = 73.8 kJ

Which one is heavier a pound of feathers or a pound of bricks? I already know oof!

Object A has a mass of 12 g and a density of 3 g/cm3. Object B has a mass of 12 g and a density of 5 g/cm3. Which object has a greater volume and by how much? Object A, by 2 6 cubic centimeters Object A, by 1.

The word atom means invisible?

A pycnometer weighs 25.60 g empty and 35.55 g when filled with water at 20°C. The density of water at 20°C is 0.9982 g/ml. When 10.20 g lead is placed in the pycnometer and the pycnometer is again filled with water at 20°C, the total mass is 44.83 g.

How does weathering affect the surface area of a rock? Explain your answer.

How would each of the following procedural errors affect the results to be expected in this experiment? Give your reasoning in each case. (A) Not all of the liquid was vaporized when the flask was removed from the water bath.

What volume of 2.00 m must be added to 150.0 ml of 1.00 m chloroacetic acid to produce a buffer solution having a ph of 3.30?