Which pair of elements show similarities in the pattern of chemical bonding?

A. Lithium and Sodium

B. Beryllium and Boron

C. Carbon and Surfur

D. Hydrogen and Helium

E. Hydrogen and Lithium

In which two types of reactions do opposite chemical changes occur? A.) double replacement and combustion B.) single replacement and double replacement C.) synthesis and decomposition D.) combustion and synthesis

Hydrogen gas is a non polluting fuel hydrogen gas may be prepared by electrolysis of water. 2 H20 (l) - - > 2H2 (g) + O2 (g) Predict the signs of delta H and Delta S for the production of hydrogen gas by electrolysis of water a.

A particular sample of pantothenic acid, a B vitamin, gives off 72.6 mL of nitrogen gas at 23 degrees c and 795 torr. What is the volume of the nitrogen at STP?

What is the net ionic equation for Fe (NO 3) 2 (aq) + Na 2 CO 3 (aq) ⟶ CaCO3 (s) + 2 NaNO 3 (aq)

The chemical equation below summarizes cellular respiration. 6O2 + C6H12O6 à 6CO2 + 6H2O + energy The energy that is released by cellular respiration is in the form of dark energy. solar energy. nuclear energy. chemical energy.

When heat is added to or removed from a substance, it may change its state. What state will most likely result if heat is added to a liquid?

Chemical Reactions Lab Procedures: 1. Place a 1cm long piece of white chalk in a clear plastic cup. 2. Add 5 mL of vinegar to the cup. 3. Record your observations. If you were performing the procedures above you would need to A.

How many moles of oxygen are in 0.53 moles of co 22?

The car wit fastest acceleration is the tempest. it has an acceleration of 6.1 m/s. suppose the car accelerates from rest to a final speed of 30. m/s. how long does it take the tempest to reach this speed?

What is the wavelength of 2.18*1016 hz wave?