Which of the following is a source of chemical energy commonly used by humans? A. water flowing in a river B. a bicycle C. a sandwich D. turning on a lightswitch

Under laboratory conditions of 25.0 degrees C and 99.5 kPa, what is the maximum number of liters of ammonia that could be produced from 1.50 L of nitrogen according to the following equation? N2 (g) + 3H2 (g) - --> 2NH3 (g)

If 455 J of heat is transferred to 25.0g of water at 45.0 degrees Celsius, what is the final temperature of the water?

The lowest whole number ratio of ions

What is the approximate value of the length of the carbon-carbon bond in ethene?

How many moles is 1.25 x 1024 atoms of bromine?

Which indicator will be the same color in hydrochloric acid as it is in pure water? 1. methyl orange 2. phenolphthalein 3. bromcresol green

Based on your knowledge of energy resources conservation, which of the following statements is true? a) Manufacturers can increase a light bulb's energy efficiency by using technology that decreases the amount of electromagnetic energy the bulb

Ammonia (nh3 (g), hf = - 46.19 kj/mol) reacts with hydrogen chloride (hcl (g), hf = - 92.30 kj/mol) to form ammonium chloride (nh4cl (s), hf = - 314.4 kj/mol) according to this equation:

How does an electromagnet create a magnetic field

Magnetism, reactivity, and fluorescence are three special properties used to identify minerals. true or false