Which of the following is a scalar quantity?

A.) displacement

B.) time

C.) velocity

D.) force

What changes occur at the molecular level when ice cream melts and forms a liquid?

A scientist would most likely need to update her model when it

Would elements in the same family (group) make similar compounds?

How did the development of the earliest idea about atoms differ from the later work of scientists? A. It was based on sound evidence. B. There were explanations for the idea. C. It was based on the thoughts of an early philosopher. D.

A sample of helium gas has a volume of 0.180L, a pressure of 0.800a and a temperature of 29 C. What is the new temp or gas of volume of 90mL and pressure of 3.20 atm

In the chemical formula 3NO2 the number 3 is a

W (g) + X (g) - -> Y (g) + Z (g) Gases W and X react in a closed, rigid vessel to form gases Yand Z according to the equation above. The initial pressure of W (g) is 1.20 atm and that of X (g) is 1.60 atm. No Y (g) or Z (g) isinitially present.

In this process, a piece of paper with small holes in it separates a heterogeneous mixture by letting through the small particles and keeping out the big ones. That is called as

The double bond between carbon and oxygen is similar to an alkene C-C, except that C o is: a) shorter and weaker. b) shorter and stronger c) longer and weaker. d) longer and stronger.

Calculate the half-life (in s) of a first-order reaction if the concentration of the reactant is 0.0576 M 17.1 s after the reaction starts and is 0.0249 M 97.8 s after the reaction starts.