What was helium used for in the past?

Which of the following pairs of reactants will react together to produce water (H2O) as one of the products? A. Fe (OH) 3 and CuO B. Cu (OH) 2 and H2S C. MgO and Ca (OH) 2 D. SO3 and H2O

Liquid nitrogen is used as a commercial refrigerant to flash freeze foods. Nitrogen boils at -196°C. What is this temperature on the Kelvin temperature scale?

Write the balanced equation for the reaction of hydrogen chloride with sodium hydrogen carbonate to give sodium chloride, carbon dioxide, and water.

The water in a 150 mL flask is poured into a beaker that contains 600 mL of Ethel alcohol which substances dissolved in the mixture

Fluorescence spectroscopy relies on: A. the difference in color between two samples. B. the shift in wavelength from excitation and emission. C. the vibrations of atoms bonded together in a molecule. D.

What will happen if the density of an object is less than the density of water?

Which cannot be separated into simpler substances? compound element solution mixture

What jobs involve chesmistry

Think about a neutral magnesium atom. Then think of a magnesium ion with a 2+charge. How are these two alike? How are they different? Be sure to use the terms proton, neutron, and electron in your answer.

What subatomic particle is specifically responsible for combining the atoms together to form a new substance?