How many protons z and how many neutrons n are there in a nucleus of the most common isotope of silicon, 2814si?

Calculate the m/m% of casein in the milk sample:

Which statement best describes what happens when a person sees a blue ball? A. human eyes reflect blue light back to the ball. B. the ball absorbs blue light from human eyes. C. blue light absorbed by the ball is perceived by human eyes. D.

How many moles are 1.20 x 1025 formula units of calcium iodide?

Organic chemistry involves which type of study? A. The study of compounds and chemicals containing carbon, which include pharmaceuticals, drugs, and plastics. B. The study of matter and processes that occur in biological organisms. C.

Choose the correct energy transformation for the burning of a piece of wood. A. heat energy to light energy B. light energy to heat energy C. chemical potential energy to heat energy D. heat energy to chemical potential energy

Common properties of sodium, calcium, iron, and gold

The closeness of a measurement to its actual value is a measure of its A. usefulness. B. reproducibility. C. precision. D. accuracy.

At 300 k the pressure inside a gas filled container is 500 kPa if the pressure inside decreses to 100kpa but the volume remains the same what is the final temperature of the gas

The SI unit for current is: joules volts ohms amps

In chemical reactions, there is a conservation of what?