How much time does it take for light from the center of the galaxy to reach Earth?

Which of these is an appropriate instrument to measure mass? balance scale ruler graduated cylinder

Which mineral has a metallic luster? A. Gold B. Quartz C. Feldspar D. Diamond

If you have the element Boron (B) with a mass number of 10, 5 protons, 5 neutrons and 6 electrons, what would be the isotope/ion symbol?

Calculate the mass percent composition of lithium in Li3PO4 to four significant figures. Express your answer as a percent.

An instrument that allows you to look closely at objects that are invisible to the human eye, including cells

Renewable resources cannot be replaced in our lifetime

How do you make a guy who is extremely into you, even though he knows you aren't single, to bug off?

A chemist has dissolved a certain substance in water. The chemist knows that more of the substance could be dissolved into the water before it stops dissolving. Therefore, the current solution is

Which of these particles is the smallest? A. an atom B. a nucleus C. a proton D. an electron

In a five-fold serial dilution of a 20 pg/ml solution, all tube dilutions are 1/5. What is the substance concentration in the third tube of this series?