Which of the following are not clues that a chemical reaction has taken place?

A. Steam

B. Formation of a gas

C. Change in color

D. Constant temperature

A scientist has a sample of uranium-238 (U-238) that is decaying to thorium-234 (Th-234). During the transmutation, a gamma ray is emitted from the nucleus. The thorium-234 daughter particle does not decay quickly enough to be detected.

Which major cities in the u. s. are located in earthquake zones?

2. Which of the following accurately describes the effects of temperature changes on solids? A. If the temperature of a solid is increased, the solid contracts and its volume increases. B.

Find the unit vector that has the same direction as the vector v = _12j

Imagine that you put two objects in a bucket of water. Give an example of an object that has a greater mass but will float

Which of these rocks are formed by volcanic activity? select the two correct answers. a. marble b. basalt c. limestone d. granite e. sandstone

Which source is most likely an authority on the subject? Dr. Vale, a pediatrician, discusses electrical circuitry on her home-improvement website. Jonah, an amateur cook, teaches his son how to make the best grilled cheese sandwiches.

What methods can be used to break down substances into elements

8. A gas is contained in a horizontal piston-cylinder apparatus at a pressure of 350 kPa and a volume of 0.02 m3. Determine the work done by the piston on the gas if the cylinder volume is increased to 0.15 m3 through heating.

A 75.0 kg person stands on a scale in an elevator. (a) What does the scale read (in N and in kg) when the elevator is at rest?