Why do scientists and engineers update

models?

Powdered sulfur and iron filings are mixed together. What physical property could you use to separate them?

How are the planes' contrail lines similar to clouds?

A chunk of pure silver weighs 20.0 g. What is its volume? Silver has a density of 10.49 g/cm cubed. Use unit analysis, NOT the Density formula.

If a brick is chopped in half, what is the density of the half of block? for science

State the Pauli exclusion principle. Choose one: A. No two electrons in an atom can have the same set of four quantum numbers. B. Each electron goes into the lowest-energy orbital available. C.

A conical, flat-bottomed flask with a narrow neck that can be used for heating, mixing, watching reactions, and swirling, not for measuring

Answer 1. the law of conservation of mass states that mass is neither created nor destroyed in an ordinary chemical reaction. when an iron nail rusts, it seems to get heavier in mass. does the iron nail follow the law of conservation of mass?

Ammonia (NH3) burns in air to form nitrogen dioxide and water. Calculate grams of nitrogen dioxide produced if 4.0 grams of ammonia are consumed

What year did mendeleev organized his periodic table in order of increasing atomic number

What is the volume of 1.9 moles of chlorine gas (Cl2) at standard temperature and pressure (STP) ? 12 L 22.4 L 43 L 81 L