The number 0.00003007 expressed in exponential notation is

Which of the following is the trend down a period? A. The number of complete electron shells increases by one. B. The number of complete electron shells stays the same. C. The number of outer shell electrons decreases by one. D. None of these.

The atomic number of an element is always the same as ___ A. The number of electrons B. The number of protons C. The number of neutrons D. The number of protons plus neutrons

What's a giant hunk of rock and metal

A train travels at a speed of 30 miles per hour. If 1 mile = 1.6 kilometers, how fast is the train traveling in kilometers per minute? A - 1.0 km/min B - 0.4 km/min C - 0.8 km/min D - 0.6 km/min

Which of these are the largest? asteroids, comets, meteors, or are they all the same size?

A gas has a pressure of 0.370 atm at 50.0 °C. What is the pressure at 22 °C, assuming volume remains constant? A.) 0.34 atm B.) 0.58 atm C.) 0.74 atm D.) 0.98 atm

Two chemical reactions are shown: C + O2 → CO2 CO2 + H2O → H2CO3 Which statement is true? Both are synthesis reactions. Both are decomposition reactions. A is a synthesis reaction, and B is a decomposition reaction.

After an experiment is complete and has been published, what process makes sure the results are reliable? A. Falsifiability B. Peer review C. The conclusion D. Error Bars

Heat is released when H2 gas and O2 gas react to form H2O. Why? A. Breaking the H-H bond in H2 gas releases heat. B. Breaking the O-O bond in O2 gas releases heat. C. Forming the H-O bonds in H2O releases heat. D.

Which of the following shows a chemical reaction in which aluminum and hydrochloric acid are the reactants and aluminum chloride and hydrogen are the products? A. aluminum + aluminum chloride → hydrochloric acid + hydrogen B.