Which formula represents an ionic compound?

(1) NaCl (3) HCl

(2) N2O (4) H2O

Which of these elements is a metal? Hafnium Radon Silicon Sulfur Selenium

True or False ocean waves carry water from hundreds of miles away

When chemists write out reactions, they often place numbers to the left of a chemical formula. e. g. the first 2 in: 2H+O-->H2O.

Which best describes Alana's error? Alana summarized what happens when a ball sitting on top of a grassy hill rolls down the hill. The motionless ball has potential energy. Once the ball starts to roll down the hill, new kinetic energy is made.

Extreme (1, 2, or 3) in the center of nebulae causes hydrogen atoms to shed their electrons and collide with one another. The (4, 5, or 6) of the collisions cause the smaller, bare nuclei to fuse into large helium nuclei. 1. expansion 2. heat 3.

Select the correct answer. Which term refers to a fact that naturally occurs in the universe? O A. scientific law B. scientific inquiry conclusion D. hypothesis Reset Next

Explain the process for determining the molar mass of Carbon Dioxide (CO2)

Write the electron configuration of the atom in the third row of the periodic table that has the smallest ei4.

In an atom, the number of electrons is unrelated to the number of protons. TRUE FALSE

Isomeric pair that represent a chain, positional and functional group isomerism for CH3CH2CH=CH2