Which are isotopes? an atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has?

4. Which statement is true about the gravitational force? A. It only acts on objects that are in contact. B. It acts on all objects all of the time. C. It acts just on objects that are moving apart. D.

Factors that limit a technological design are called constrains. But why?

Using data from Ms. Baltzers students, they found the mass of a piece of brown metal was 14.2 grams, and the volume of that same piece of metal was 1.8 mL. what is the density of the brown metal?

Which of the following is a valid conversion factor

Identify each energy exchange as primarily heat or work and determine whether the sign of ΔE is positive or negative for the system. a. A rolling billiard ball collides with another billiard ball.

What might be a scientific question? O A. One that deals with how something happens O B. One that deals with morals and beliefs O C. One that deals with likes and dislikes O D. One that deals with right and wrong

Calculate the energy released in the following fusion reaction. The masses of the isotopes are: 14N (14.00307 amu), 32S (31.97207 amu), 12C (12.00000 amu), and 6Li (6.01512 amu).

How many grams of carbon dioxide are produced from 0.98 mol of Fe3O4?

There is inverse relation between pressure and diffusion in liquid phase? •True •False

What do you need in order to do a stoichiometric calculation? (Choose multiple) Balanced Chemical Equation Molar masses of compounds involved The type of reaction taking place Oxidation Numbers