Water H20, is made up of different elements, hydrogen and oxygen. Is this type of combination a mixture or pure substance?

An element has 8 protons and 8 neutrons in its nucleus and 8 electrons revolving around the nucleus. What is the atomic number and atomic mass of this element? The atomic number is 16 and the atomic mass is 8.

The attraction between particles give solids a definite

Which of the following elements will form an ion net charge of - 3 A. Aluminum B. Selenium C. Oxygen D. Phosphorus E. none of these

Which has a higher frequency a neutron or electron

What happens during interphase?

Convert 3.57 moles of aluminum to grams

An average microwave uses a frequency of 2.54 GHz. How much energy is emitted?

Why scientist form a hypothesis

Step two of the procedure states: "Using sterile technique, place a loopful of inoculum from the M. luteus culture in the drop of nigrosin and mix." Which of the procedures qualifies as sterile technique?

If 4.34 moles of potassium react with excess water, how many moles of hydrogen gas would be produced at STP