By studying a star's spectrum, scientists can work out its chemical make-up and temperature. What instrument do astronomers' use to carry out this task?

A) space probe

B) spectroscope

C) radio telescope

D) light telescope

Calculate the energy if 48.7 g of Al reacts in the following reaction. (Al = 26.98 g/mol) Fe2O3 (s) + 2 Al (s) →Al2O3 (s) + 2Fe (s) ∆Hrxn = - 852 kJ.

In this redox reaction, identify the oxidizing agent. 2Li + F2 → 2LiF

Write the quantities 3 * 10^-4 cm and 3 * 10^4 km in ordinary notation

Which piece of information is not necessary to calculate the force of gravity between two objects, A and B? A. The mass of object A. B. The mass of object B. C. The velocities of A and B. D. The distance between A and B.

If 1.12 g of phosphorus acid were dissolved in 100.0 mL of H2O. What is the concentration of the solution in molarity?

A 25 N and 5 N force pull to the right. Friction is 10 N. If the object is 5 kg, find the net force and acceleration.

What properties of matter are intensive independent of their size

What is the density of an object having a mass of 8.0g and a volume of 25cm3

What is a Cilla? (In drawing)

Which term names the group of organisms able to interbreed and produce fertile offspring?