How is a pure substance different than a mixture

Does the moon's shadow change relative to the sun

a technical machinist is asked to build a cubical steel tank that will hold 270L of water. Calculate in meters the smallest possible length of the tank. round to the nearest 0.01

A 24.1-g mixture of nitrogen and carbon dioxide is found to occupy a volume of 15.1 L when measured at 870.2 mmHg and 31.2oC. What is the mole fraction of nitrogen in this mixture?

The empirical formula for glucose is CH2). The molar mass of glucose is 180.2 grams per mole. Determine the molecular formula of glucose.

Are soft drinks mixtures on pure compounds?

A new element has two isotopes, one with a mass of 40.0 amu and the other with a mass of 42.0 amu. the atomic weight is 40.50 g/mol. pick the true statement a. the isotope at 42.0 amu is less abundant b. the element has 19 protons and 21 neutrons c.

Which of the following wave is most like visible light? a sound wave moving through the air a radio wave moving through space a water wave moving through a lake a sound wave moving through wood

What holds the atoms together in a covalent bond? the attraction between the shared electrons and protons in each nucleus a weak electron cloud the attraction of the opposing ions the crystal lattice structure

A container with the ability to expand and contract has its pressure changed from 5.0 atm to 7.5 atm at constant temperature. It the original volume was 4.0 L, what is the new volume?

What is the final volume (L) of a 1.00 L system at 315 K and 1.10 atm if STP conditions are established?