What is light emitting diode

Look at the periodic table and the characteristics of the elements given above. Select the group of elements that include only those that are either colorless, odorless gases or shiny, silvery, soft metals.

You need 1.50 moles of ammonia (nh3) for a reaction at stp. what volume of ammonia must you measure? also, how many molecules of nacl are in 23.40 grams nacl?

What are the metric units of volume, mass and density?

When (1R, 2R) - 1-chloro-2-methylcyclohexane is heated with NaOCH3, the predominant product is ... ? A. 3-methylcyclohex-1-ene (racemic) B. methylcyclohexene C. (1S, 2R) - 1-methoxy-2-methylcyclohexane D. (S) - 3-methylcyclohex-1-ene E.

Which statement describes what happens when a rubbed with a wool cloth? -Electrons move from the atoms in the cloth to the atoms in the balloon, causing the balloons to have a negative charge -Electrons are shared equally between the atoms of the

Which type of compound forms when a hydroxyl group is added to a carbon compound

What is pH? a. The negative logarithm of the hydrogen ion concentration b. The positives logarithm of the hydrogen ion concentration c. The negative logarithm of the hydroxide ion concentration d.

What elements do not contain any neutrons

A) What are the postulates of Bohr's model of an atom? (b) Show diagrammatically the electron distributions in Sodium, Lithium and Aluminium atoms

How many liters of air are in a room that measures 10.0 ft * 11.0 ft and has an 8.00 ft ceiling? 1 in. = 2.54 cm (exactly); 1 L = 103 cm3