Lenses can be found in a variety of objects. Which example does not contain a lens?

an electron microscope

night vision goggles

a diving mask

a smart phone

A hydrocarbon contains 85.7% carbon and the remainder ishydroge. Its molar mass is 70g/mol. Determine the empirical andmolecular formulas of the compound. 2NaBH4 (s) + I2 (s) - > B2H6 (g) + 2NaI (s) + H2 (g) Suppose you use 1.

A 10 M concentrated stock solution of NaCl is used to prepare 2 liters of diluted 1 M solution. Which of the following is true for the process used to achieve the required dilution? The volume of the solvent used is less than 2 liters.

How many atoms are in 1 mole of ca

The movement of particles from a less crowded area to a more crowded area requires what

Explain with example, why there cannot be an oxidation reaction without a corresponding reduction reaction

The universe contains billions of galaxies, each containing billions of stars. True or false

How is measuring the volume of liquids different than measuring the volume of regular-shaped solids?

Which of the following best describes the motion of the particles in a piece of steel?

Student follow up The ionic equation for the reaction between zinc and sulfuric acid is. Zn (s) + 2H (aq) - - Zn" (aq) + H2 (g) a State what has been oxidised in this reaction. Explain your answer in terms of electrons.

What kind of group 1 atoms are the most reactive? a. Small atoms c. Atoms with the most electrons in the valence level b. Large atoms d. Atoms at the top of the periodic table