Calculate the frequency (in Hertz) of light with a wavelength of 420 nm. What color is the light?

Chemical changes do not form new compounds do not decompose the old compounds form new compounds change the appearance of the old compounds

Which element has both metallic and nonmetallic properties? (1) Rb (3) Si (2) Rn (4) Sr

Which chemical equation shows that the total mass during a chemical reaction stays the same? A) Mg + Cl2 → MgCl2 B) NaOH + MgCl2 → NaCl + MgOH C) 2Na + 2H2O → NaOH + H2 D) H2O + O2 → H2O

How many grams of oxygen are formed when 8.20 moles of KOH are formed? 4 KO (s) + 2 H2O (l) → 4 KOH (s) + O2 (g)

Fluorine (F) and bromine (Br) are in the same group on the periodic table. How do atoms of these elements compare when they form bonds? 1-Both a fluorine atom and a bromine atom lose one electron, and both atoms become stable.

Which of the following is an example of a chemical change? A bike rusting Mixing salt and pepper A brick breaking Gold melting

Which law is described by saying that doubling the absolute temperature will double the pressure of a sample of gas in a rigid container? Boyle's law Charles's law Dalton's law Gay-Lussac's law

The nucleus of an atom consists of a. neutrons and electrons. b. neutrons alone. c. protons and neutrons. d. protons and electrons.

What holds the two strands of a DNA molecule to each other?

1. Copper (__) is an element on the periodic table. CU (both letters capitalized) Cu (first letter capitalized) cU (second letter capitalized) cu (both letters lowercase)