Which conditions are necessary for a lunar eclipse to occur?

A) Earth is in the moon's shadow.

B) The moon is in Earth's shadow.

C) The moon is in the Sun's shadow.

D) The Sun is in the moon's shadow.

How many liters of fluorine gas can react with 32.0 grams of sodium metal at standard temperature and pressure? show all of the work used to find your answer. 2na + f2 yields 2naf?

Calculate the mass, in grams, of 0.433 mole of calcium nitrate

On a contour map, what do contour lines that are close together represent? a.) steep slopes b.) gentle slopes c.) wavy land d.) no change in elevation

Which statement best describes the structure of covalent network solids? A. They are giant structures held together by weak forces of attraction. B. All the atoms are covalently bonded to other atoms to form a lattice-like structure. C.

Classify each of the following as a physical or chemical property

When 17.0 grams of an unknown metal is cooled from 35.0°c to 10.0°c it releases 862 joules of energy. what is the specific heat capacity of the unknown metal?

What action could slow a chemical reaction rate? a. lowering the pressure b. raising the temperature c. increasing the concentration d. adding more of a substance to a mixture

Write the ratio as a fraction in lowest terms. compare in inches. 3 feet to 45 inches

A solution contains 4.10 moles of water, 1.00 moles of sucrose (C12H22O11), and 1.10 moles of glucose. Sucrose and glucose are nonvolatile. What is the mole fraction of water in this solution?

In which state of matter has least amount of kinetic energy A gas B liquid C plasma D solid