When a chemical change occurs,
A.
the colors of the substances involved never change.
B.
new substances with new properties are formed.
C.
it is always because something was burned.
D.
the newly formed substances have the same properties as the old substances.

Suppose you have designed a new thermometer called the x thermometer. on the x scale the boiling point of water is 129 ? x and the freezing point of water is 13 ? x. part a at what temperature are the readings on the fahrenheit and x thermometers the same?

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?