Question 9

10 pts

How many calories are released as 50.0 g of water cools from 100.0 °C to 25.0 °C?

750 cal

7500 cal

3750 cal

1250 cal

Any naturally occurring, inorganic, crystalline substance with a fairly definite chemical composition is called a

Photosynthesis occurs mainly in what part of most plants?

3) Which pair of formulas represents the empirical formula and molecular formula for a certain (the same) compound? A. CH4 and C2H6 B. CH2O and C4H6O C. O2 and O3 D. C3H403 and C6H8O

Given the thermochemical equation for photosynthesis, calculate the mass, in grams, of O2 that is produced by photosynthesis when 22700 kJ of solar energy is consumed.

Use you're words to define matter

Why decomposition of ammonium nitrate is a redox reaction?

Two formulas for compounds containing hydrogen and oxygen are H2O and H2O2. Do these formulas represent the same compound? Explain.

My dog made become frightened and cover when he hears loud thunder this is an example of a reaction to What kind of stimuli A. chemicals B. light C. touch D. sound

Some elements are solids at room temperature true or false

What is the most expensive element?