All of the elements in the periodic table have just recently been discovered.

a. True

b. False

If a mountaintop is 10,000 feet above the valley below we can expect the temperature to be about? A: About 36 degrees F lower B: About 36 degrees F higher C: No change at all, the same D: Its impossible to estimate the change in temperature

In the activated complex for a chemical reaction, what bonds are broken and what bonds are formed?

changes of state occur when there is change in a. thermal energy b. electromagnetic energy c. chemichal energy d. eletrical energy

Which chemical agent is thought to be associated with "runner's high"?

What is the molar volume of a gas at standard temperature and pressure? 1.0L 2.4L 11.2L 22.4L

How do scientist know that atoms and molecules combine in well-ordered arrays?

Explain why potassium and argon react together

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: