Planets in our solar system do not revolve around the sun in perfect circles. Their orbits are more like ovals that scientists describe as which of the following?

A.

revolutionary

B.

rotational

C.

periodical

D.

elliptical

What is the abreviation for carbon dioxide?

Why is H2CO3 → H2O + CO2 decomposition?

If 4 liters of gaseous hydrogen combines with 2 liters of gaseous oxygen and both are diatomic molecules, how many liters of gaseous water will be formed? Assume this occurs under conditions of constant temperature and pressure. A. 2L B. 1L C. 5L 4.

What type of substance would salt water be classified as? select all that apply. a. heterogeneous mixtureb. homogeneous mixturec. colloidd. solutione. suspension

What is the oxidation state of Fe (s)

02:Matter and Change What is one difference between a mixture and a compound? A. A compound can only be separated into its components by chemical means. B. A compound consists of more than one phase. C.

Charlotte is planning an investigation to learn how temperature affects the amount of salt that can be dissolved in a liquid. In Charlotte's experiment, which of the following things should she control, or keep the same? A. the type of liquid used B.

Which property ofsulphuric acid makes it suitable to use as a catalyst for the preparation of esters?

Which is an example of a covalent bond? Chlorine accepts an electron from calcium to form a stable bond. Ions in a bar of pure iron are surrounded by a large number of valence electrons.

Which frequency has more energy? (high frequency or low frequency)