NC Check In Review 1

What is a compound

• sodium

• sugar

• nitrogen

• air

Tags

NGSS.MS-PS1-1

Which is the best estimate of the melting point of Rubidium (Rb)?

• 25* C

• 40* C

• 75* C

• 184* C

Tags

NGSS.MS-PS1-4

Two different liquids are poured together in an open container. Bubbles begin to form. After the bubbling stops, it is determined that the total weight of the two liquids is less than before they were poured together. Which best describes this observation?

• Some of the atoms during the reaction escaped into the air.

• Some of the atoms during the reaction were destroyed.

• Some of the atoms during the reaction became heavier.

• Some of the atoms during the reaction changed to a different kind of atom.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

This is a chemical reaction for the decomposition of carbonic acid into water and carbon dioxide.

How does this reaction support the Law of Conservation of Mass?

• Several molecules of water are produced.

• The mass of carbon atoms is reduced during the reaction.

• The mass of the atoms in the reactant equals the mass of the atoms in the products.

• The mass of hydrogen atoms is the only thing that remains the same before and after the reaction.

Tags

NGSS.MS-PS1-5

Which is classified as an element?

• carbon dioxide

• iron

• vinegar

• water

The sequence of the elements in Period 5 of the periodic table is best described as (a)   .

• highly reactive gases, relatively n
• highly reactive metals, relatively
• nonreactive gases, metalloids, nonr
• nonreactive gases, nonreactive meta

Match each statement about chemical reactions to the correct description.

• The quantity of atoms present in the reactants influences what products are made.

• The number of atoms in the reactants determines the products.

• Only a portion of the reactant atoms are found in the products after the reaction.

• The physical states of the atoms in the reactants determine the products.

• No atoms are lost or gained; all reactant atoms are rearranged to form the products.

• All of the atoms in the reactants will be a part of the products.

• The products are formed based on whether the reactant atoms are solids, liquids, or gases.

• Some of the atoms in the reactants will be a part of the products.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Chlorine has 7 valence electrons. With what group of elements will chlorine most readily bond?

• group 1

• group 2

• group 16

• group 18

The best example of a chemical change is (a)   .

• butter melting
• egg cooking
• paper tearing
• water evaporating

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Match each chemical reaction to the law it best represents.

• Unbalanced reaction with incorrect product formula.

• Unbalanced reaction with missing atoms on either side.

• Balanced reaction representing the Law of Conservation of Mass.

• Unbalanced reaction with unequal number of atoms.

Tags

NGSS.MS-PS1-5