how many joules of energy are necessary to heat a sample of water with a mass of 46.0 grams from 0.0°C to 100.0°C?

Ammonia reacts with oxygen according to the equation: 4 nh3 (g) + 5 o2 (g) → 4 no (g) + 6 h2o (g) δhrxn = - 906 kj calculate the heat (in kj) associated with the complete reaction of 155 g of nh3.

Which of these is formed during a metabolic reaction of cellular respiration

Boron has an atomic mass of 10.811. What does this mean?

How fast do you think the air particles in this room are moving compared to a car going 50 mph (about 22m/s) ? Put your answer is in the form, 'a molecule travels ___ as fast as a car"

Ou encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution?

The Florida maple tree is flowering plant. The Florida long leaf pine tree is nonflowering plant. Both trees go through various stages in their life cycles. Which stage is found in the life cycles of both?

The number of different bond angles for the most polar isomer of Pbr2F3 is? A. 7 B. 6 C. 5 D. 8

What is an example of a chemical change? A. water evaporating from a puddle B. cloth tearing when pulled C. wood forming sawdust when cut D. bread baking in an oven

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Choose the correct equation to represent the following statement (unbalanced chemical equation) : ethane reacts with oxygen to yield carbon dioxide and liquid water. a. c2h6 ( g. o2 ( g. co2 (l) h2o ( g. b. c2h6 ( g. o2 ( g. co2 ( g. h2o (l) c.