Which sample is a pure substance?

a test tube of zinc oxide

a container of zinc and oxygen

a flask of pond water

a jar of soilWhich sample is a pure substance?

a test tube of zinc oxide

a container of zinc and oxygen

a flask of pond water

a jar of soil

Do the number of protons in an atom of an element always equals its atomic weight.

To find the mass defect for uranium-238 several calculations must be made. which is the calculation that should be made first? assume atomic number for uranium-238 is 92. 92 (1.0073) x 92 (1.0087) = 92 (1.0073) x 146 (1.0087) = 146 (1.0073) x 238 (1.

Is the procedure a part of the scientific method

An ideal gas in a 1.25-gallon container is at a temperature of 125 degrees Celsius and pressure of 2.5 atmospheres. If the gas is oxygen (formula:O2 molecular weight = 32 grams per mole), what is the mass of gas in the container in units of grams?

A wide flat zone of small particles that orbit a planet. what is it

How does electronegativity affect the polarity of the bond between two atoms?

How much heat (energy) would need to be absorbed by 1.5 g of liquid water to cause a temperature change of 30.45 °C? The specific heat of water is 4.18 J/gºC.

What happens when electrons are passed from one atom to a more electronegative atom?

Calculate the k sp for zinc hydroxide if the solubility of zn (oh) 2 in pure water is 2.1 * 10-4 g/l. calculate the k sp for zinc hydroxide if the solubility of zn (oh) 2 in pure water is 2.1 * 10-4 g/l. 2.9 * 10-3 1.5 * 10-3 9.9 * 10-18 3.8 * 10-17

What is the importance of the coefficients in a balanced chemical reaction?