Which statement correctly describes a physical change?

True or False. Dominant traits are traits that will be expressed. Recessive traits are traits that are never expressed in the presence of a dominant trait. They can only be expressed when both alleles are recessive.

Match the substance with its chemical formula. 1. H + water 2. H2O hydrogen ion 3. H3O hydronium ion 4. OH - hydroxide ion

A buffer solution is 0.100 m in both hc7h5o2 and kc7h5o2 and has a ph of 4.19. What ph values would you expect from the addition of a small amount of a dilute solution of a strong base?

A sample contains 1.29*1022 atoms of Cs. Calculate the amount of Cs.

What similarities and difference exist between electrons and neutrons? Consider charge, size, location and number.

What are two examples of decomposers

An unknown substance dissolves in water but it does not conduct electricity before or after it has dissolved.

21% of oxygen in air with barometric pressure of 625. what's partial pressure

Which situations will NOT increase the reactions rate of most chemical reactions A) an increase in temperature B) grind up the solute to increase surface area before mixing C) by increasing the pressure in which the reaction takes place D)

What are the three types of matter?