A physical change in matter is a change in size and shape, (through cutting, breaking, or grinding), or state, (through melting, boiling, freezing, evaporating, and condensing).

True

Or

False

Which of the following methods can be used by officials to solve the problem of water pollution? Use scientific solutions. Stop droughts and floods. Increase number of factories. Dispose of chemical wastes in dustbins.

Which one of the following is a solution? Question 21 options: oxygen salt water sugar chocolate chip cookies Which of the following is a compound?

Substitute natural gas (sng) is a gaseous mixture containing ch4 (g) that can be used as a fuel. one reaction for the production of sng is

Consider the reaction below: NO3 (g) + NO (g)  2 NO2 (g) If the concentration equilibrium constant for this reaction is Kc = 3.

1.16 g aspirin was synthesized from 1.03 g salicylic acid and 2.00 mL of acetic anhydride. Calculate the mass percentage yield. Molar mass of salicylic acid = 138.12 g/mol Molar mass of aspirin = 180.16 g/mol Density of acetic anhydride = 1.

Write chemical equation and balance for copper (II) nitrate and barium sulfide

What is the density of a block of salt having a mass of 8.0g and a volume of 25cm cubed

According to the periodic trend, which of the following is most likely to have the lowest electronegativity? I Rb Y Pd

In an experiment, a student estimates the acceleration due to gravity is 9.31 m/s2. The actual value is 9.8 m/s2. What is the student's percent error

Phosphoric acid can be used to clean scale (calcium carbonate) from water fixtures like taps by reacting with it to form products that dissolve easily. warming the phosphoric acid solution would - a. remove less scale. b. remove more scale. c.