As a sample of the radioactive isotope 131I decays, its half-life (1) decreases (2) increases (3) remains the same

What happens when the student use a straw to blow a stream of air between the papers?

Name the acids: HBrO

A boy kicks a ball with a force of 40 N. At exactly the same moment, a gust of wind blows in the opposite direction of the kick with a force of 40 N. What happened to the ball? A. It began to move with a speed of 80 m/s. B. It did not move. C.

At 80 K, the particles of a gas have: A) twice the average kinetic energy of the same particles at 40K. B) half the average kinetic energy of the same particles at 40K. C) one-fourth the average kinetic energy of the same particles at 20K.

3. A 0.821-mol sample of a substance composed of diatomic molecules (of the same atom) has a mass of 131.3 g. Identify this molecule.

An unknown solution turned red litmus paper red, turned blue litmus paper blue, and didn't conduct electricity. The solution is most likely ... a Basic b Acidic c Neutral d Not enough information to determine

Which of the following does NOT occur at a subduction zone? A. The leading edges of both plates are bent downward. B. Oceanic crust is pushed down into the mantle. C. One oceanic plate moves into another oceanic plate. D.

4. What structural characteristics do all hydrogen atoms have in common?

Which of the following would be a result of increased solar activity? A. Longer winters B. Warmer-than-normal sea surface temperatures C. Colder-than-normal sea surface temperatures D. Shorter summers

The electron configuration of an element is 1s22s22p63s23p64s1. why is this a representative element?