What waves need mediums to travel

Find the radius (r) of an aluminum cylinder that is 2.40 cm long and has a mass of 13.0 g . For a cylinder, V=π r 2 l . (The density of aluminum is 2.70 g/c m 3 .)

How many electrons do each of the elements in Group 2 of the periodic table have in their electron dot diagrams?

Fill in the blanks with the word that best completes each statement Scientists develop knowledge by making about the natural world that may lead to a scientific question A scientific question may lead to an) which can be tested.

Explain how the energy from the sun transfers to you when you eat a cheeseburger.

At 17 °C, a 0.80 mole sample of a gas exerts a pressure of 1.2 atm. What is the volume of the container? a. 16 L b. 23 L c. 0.063 L d. 2400 L

When conducting an experiment, a scientist should: (a) attempt to test every possibility (b) attempt to control the conditions (c) place no limits on the investigation (c) proceed without specific goals

Can atoms be divided into smaller pieces

How many atoms are in 1.25 moles of calcium acetate, ca (c² h³ o²) ²?

What is a physical change? A change in matter from one form to another without becoming a new substance. A change in matter that results in a chemical reaction. A change in matter that results in the smallest unit of a compound.

You are in the room with several objects, the temperature in the room is 21 celcius, what can you assume about the temperatures of the objects in the room?