Friday (9/9). Spillway gates will be opened at 10 a.m. Monday (9/12) to release 1,000 cubic feet per second through the spillway, which runs from the lake to the Lackawaxen River. The release rate will be increased gradually to 2,000 cubic feet per second, and held at that level.
Rust-compound Air-mixture Helium-element soil-mixture Sea water-mixture salt-compound An element is made of a single pure substance, matter-Helium, hydrogen, etc. A compound is a pure substance made of elements chemically put together. Not easily separated.
Compounds have a uniform composition, while a mixture does not. Water is a compound, because its molecules contain two hydrogen atoms and one oxygen atom. One example of a mixture is brass, which can contain varying quantities of copper and zinc. The element copper has an atomic number of 29, and it is a metal.