In what important way was Mendeleev's Periodic Table different from the modern Periodic Table?

Work done by a system is positive or negative?

What bonds to cytosine (C) in DNA.

What subatomic particle acts like a mini-magnet? the electron the neutron the proton

There are three groups that contain carbon but are not organic compounds: •carbon chlorides •carbon oxides •carbon iodides •carbides •carbonates

Explore this interactive illustration by clicking through the presentation on the movement of Earth's tectonic plates through time. The continents of Africa and South America used to "fit together" like puzzle pieces.

Two gas jars are connected to each other, but they are separated by a closed valve. One gas jar contains oxygen, and the other is empty. What will happen when the valve is opened?

4. Calculate the final concentration if water is added to 1.5 L of a 12 M NaOH solution to make 3.0 L of a diluted NaOH solution. Your answer

Why is it possible to safely drink a solution that contains a 50:50 mixture of equal concentrations of a strong acid and a strong base, either of which, if ingested separately, would be very caustic and damaging?

Explain why many compounds that contain one or more hydrogen atoms are not classified as arrhenius acids

pure substance x is a green powder. when heated, it gives off a gas and changes to a black powder. is substance x an element or a compound? give reasons