8.P.1.4 Law of Conservation of Mass

The North Carolina Essential Standards are linked here for your reference.

The quick reference guide for this portion of the EOG is below including standard and

description, approximate percentage of the EOG and approximate number of questions.

This is meant as a consolidated guide only using the resources provided by NCDPI.

Specific information is linked here.

The North Carolina Essential Standards are linked here for your reference.

The quick reference guide for this portion of the EOG is below including standard and

description, approximate percentage of the EOG and approximate number of questions.

This is meant as a consolidated guide only using the resources provided by NCDPI.

Specific information is linked here.

Multiple Choice

Which pair of elements has the most similar properties?

• Li and B

• I and Ca

• K and He

• N and P

Multiple Choice

Which statement best explains how periods on the periodic table are organized?

• increasing atomic number from left to right
• increasing number of neutrons from left to right
• decreasing number of electrons from left to right
• decreasing atomic mass number from left to right

Multiple Choice

Where are the most reactive metals located on the periodic table?

• the uppermost complete row of the table
• the rows at the bottom of the table connecting two section
• the column at the far left side of the table
• the second column from the right side of the table

Multiple Choice

Sodium reacts with water. Which element is most likely to have a similar effect to sodium if it is exposed to water?

• carbon
• oxygen
• lithium

Multiple Choice

Which elements are most likely to react in the same manner in a chemical reaction?

• elements in the same group
• elements in the same period
• elements with similar atomic masses

Multiple Choice

If an element has no electrons to share and is stable, what family is it found in?

• alkali metals
• noble gases
• halogens

Multiple Choice

Why are certain elements placed into the same column on the periodic table?

• They have the same number of protons in their nuclei.
• They have the same number of electrons in their nuclei.
• They have the same number of electrons in their outer energy level.

Multiple Choice

Which property is unique for each element?

• mass number
• atomic number
• state of matter

Multiple Choice

Which subatomic particles determine the reactivity of groups of elements in the periodic table?

• electrons
• neutrons
• protons

Multiple Choice

Where on the periodic table are you most likely to find elements that do not react with other elements?

• group 1
• group 17
• group 18

Multiple Choice

Which elements would have similar properties to those of potassium?

• lithium and sodium
• bromine and krypton
• calcium and scandium

Multiple Choice

Which element is in the same family as chlorine (Cl) and fluorine (F)?

• hydrogen (H)
• lithium (Li)
• oxygen (O)
• bromine (Br)

Multiple Choice

On the periodic table, in which group is the metalloid silicon found?

• Group 3
• Group 14
• Group 15

Multiple Choice

A scientist creates a new synthetic element in a laboratory.
Where would the new element most likely be placed on the periodic table?

• near the top
• near the bottom
• on the far left side
• on the far right side

Multiple Choice

Which best describes a row of elements in the periodic table?

• column
• family
• group
• period

Multiple Choice

Which best describes how the current periodic table is arranged?

• by atomic mass
• by atomic number
• in alphabetical order by element symbol
• in numerical order by number of neutrons in the nucleus

Multiple Choice

Which is a property of metalloids?

• the ability to be pulled into long wires
• the ability to be hammered into sheets
• the ability to be a liquid at room temperature
• the ability to conduct electricity under certain conditions

Multiple Choice

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?

• 12 atoms of carbon (C)
• 6 atoms of carbon (C)
• 3 atoms of carbon (C)
• 2 atoms of carbon (C)

Multiple Choice

Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?

• A physical change occurred.
• Atoms involved in the reaction lost mass.
• Precipitates were created in the new solution.
• Gases were released to the atmosphere.

Multiple Choice

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

• During a chemical reaction, the total amount of matter stays the same.
• During a chemical reaction, matter is destroyed.
• During a chemical reaction, one or more new substances are formed.
• During a chemical reaction, the total number of atoms increases.

Multiple Choice

What coefficient for O₂ demonstrates the law of conservation of mass?
CH₄(g) + __O₂(g) → CO₂(g) + 2H₂O(g)

• 1
• 2
• 3
• 4

Multiple Choice

Which is best represented by the equation?
2Mg + O₂ → 2MgO

• Law of Conservation of Energy
• Law of Conservation of Mass
• Law of Superposition

Multiple Choice

What is the importance of a closed container in a chemical reaction?

• to observe the mass before and after the reaction occurs
• to keep any materials from interfering with the reaction
• to observe the loss of mass after the reaction occurs

Multiple Choice

Which best represents a balanced equation?

• 120 grams of carbon plus 20 grams of oxygen → 200 grams of carbondioxide
• 120 grams of carbon plus 50 grams of oxygen → 200 grams of carbondioxide
• 120 grams of carbon plus 80 grams of oxygen → 200 grams of carbondioxide

Multiple Choice

Which equation is balanced according to the Law of Conservation of Mass?

• NaCl + Mg →
   MgCl₂ + Na
• 2NaCl + Mg → MgCl₂ + Na
• 2NaCl + Mg →
  MgCl₂ + 2Na