Which of the following temperature is the coldest:

1) - 20 degree Celsius

2) - 20 degree Fahrenheit

3) 220 kelvin

An atom in its lowest possible energy state is said to be in the

Select all the items on the following list that are ions. cu po4-3 hco3- al+3 hg2+2 na2co3 fe zn

Of the three metals pb cu zn which is the most active

Which of the following equations is the correct one to use to calculate the specific heat of the metal? _ m metal ATmetal Cp, metal = map. ca/Arcal P. metal -maCacaATI m metal ATmetal P. metal

Select the atoms or ions drawn with valid Lewis dot structures. A) A carbon has a dot on top, right, bottom and to the left. a nitrogen has one dot on top, left and to the bottom and has a charge of minus 3.

Organic molecules always: A. contain carbon. B. contain carbon, hydrogen, and oxygen respectively in a 1:2:1 ratio. C. are produced by living organisms. D. dissolve in water.

Whats the scientific notation of 0.00000923

A catalyst increases the rate of a chemical reaction by

What energy is changed to cell energy in stage 1 of photosynthesis. true or false

A person produces two sound waves with a flute, one immediately after the other. Both sound waves have the same pitch, but the second one is louder. Which of the following properties is greater for the second sound wave?