K12 chemistry unit assessment: chemical bonding,

electrostatic forces in ionic bonds hold which of the following together? 1. He atoms in helium gas 2. Na + and Br - in NaBr 3. Fe atoms and localized electrons in iron

When compounds form, what is one result for the atoms that bonded?. A. a stable arrangement of electrons. B. an unstable arrangement of electrons. C. more than eight electrons in their valence shell. D.

Explain how you would expect the strength of the ionic bonds in potassium bromide (KBr) to compare with that of the bonds in lithium bromide (LiBr).

Which clue can be used to identify a chemical reaction as a combustion reaction? Oxygen is a product. A hydrocarbon reacts with oxygen. Water and carbon dioxide react. The reaction involves ions.

A certain amount of chlorine gas was placed inside a cylinder with a movable piston at one end. The initial volume was 3.00 L and the initial pressure of chlorine was 1.60 atm. The piston was pushed down to change the volume to 1.00 L.

This element has 3 electrons in its Lewis dot structure and is in the 2p orbital section

Mixtures have (exact, relative) amounts of the same substances

The Doppler effect indicates that the universe is expanded because A. light from other galaxies is different colors B. light from other galaxies are blue shift C. light from other galaxies are red shift D. light from other galaxies is the same color

2. What is the importance of meiosis and fertilization in sexual reproduction?

Molecules are the smallest units of matter with the characteristic properties of a substance. a. True b. False

For the following hypothetical reaction: 3A + 2B - > 3C. How many moles of C can you produce with 5 moles of A and excess B?