Which of the following contains the smallest amount of matter?

25 g

2.5 hg

2,500 dg

0.25 kg

A scientist is investigating the properties of two different biological membranes that have different amounts of cholesterol in them.

Does an object appear larger when the observer is closer or farther away from it?

Which electron configuration represents an excited state for an atom for calcium 1. 2-8-7-1 2. 2-8-7-2 3. 2-8-7-3 4. 2-8-8-2

A ball is thrown at a reflecting surface (mirror) as shown. A video camera is placed in line with the reflected path of the ball. What will the video camera record?

What is Calcium sulphate?

You are in a laboratory creating a new chocolate bar. You want to create the sweetest chocolate bar by maximizing the sugar concentration. You are doing this by adding the sugar to a chocolate mixture.

Determine the ph of 0.57 m methylamine (ch3nh2) with kb = 4.4 x 10-4 : ch3nh2 (aq) + h2o (l) ⇌ ch3nh3 + (aq) + oh - (aq)

Which has most likely been peer reviewed? O an article on the benefits of eating cheese, featured in Crosscreek Dairy Monthly magazine O an article on the benefits of wearing shoe inserts, featured in Bob's Footwear circular an article on the

The molar mass of Ba (OH) 2

Define mechanical energy. Using the example of the pendulum, explain how kinetic and potential energy relate to the mechanical energy at different positions.