Conservation of mass

Multiple Select

Which of the following are typically included in a chemical equation?

• Reactants

• Products

• Chemical symbols

• Physical properties

Open Ended

What information is given in a chemical equation?

Open Ended

Explain the difference between a coefficient and a subscript in a chemical equation.

Multiple Choice

Which part of a chemical equation represents the substances present before the reaction takes place?

• Reactants

• Products

• Coefficients

• Subscripts

Multiple Choice

What does the law of conservation of mass state?

• Matter can be created and destroyed.

• Matter is neither created nor destroyed.

• Mass is always lost in a chemical reaction.

• Energy is always conserved in a chemical reaction.

Multiple Choice

Which of the following are necessary to verify the law of conservation of mass in a chemical reaction?

• Counting the number of atoms of each element on both sides of the equation

• Measuring the temperature change

• Observing the color change

• Recording the time taken for the reaction

Multiple Choice

Which of the following best explains how mass is conserved during photosynthesis?

• The mass of the reactants equals the mass of the products.

• The mass of the products is greater than the mass of the reactants.

• The mass of the reactants is less than the mass of the products.

• Mass is not conserved during photosynthesis.

Multiple Choice

According to the Law of Conservation of Mass, what must the mass of water be on the products side of this reaction: Ca(OH)2 + 2HCl → CaCl2 + 2H2O?

• 5.7 g

• 8.8 g

• 9.2 g

• 10.1 g

Multiple Choice

Read the passage and answer the following question(s). 

                          Chemical Reaction Equation 

When solid sodium chloride, NaCl, mixes with aqueous sulfuric acid, H₂SO₄, it turns into aqueous sodium sulfate, Na₂SO₄, and hydrogen chloride gas, HCl. The balanced chemical equation for this reaction is shown. 

Which statement supports the conservation of mass in this reaction?

• There are equal numbers of sodium atoms in the products and in the reactants. 

• There are fewer atoms of oxygen in the reactants than there are in the products.

• There are more atoms of chlorine in the reactants than there are in the products. 

• There are more atoms of hydrogen in the products than there are in the reactants.

Multiple Choice

What is the main objective for students when investigating how mass is conserved in chemical reactions, according to the lesson plan?

• To memorize chemical equations

• To analyze how matter cycles through systems and relate it to rearrangement of atoms using chemical equations

• To perform experiments without analyzing results

• To focus only on photosynthesis

Open Ended

How can you show conservation of mass in a chemical reaction using the periodic table and a balanced equation?

Multiple Choice

What is the main focus of the lesson scheduled for Thursday according to the TEK and lesson objectives?

• Newton's Second Law of Motion

• Photosynthesis

• States of Matter

• Electric Circuits

Multiple Select

Which of the following are objectives for the lesson on Newton's Second Law of Motion?

• Constructing tables and graphs to analyze acceleration

• Applying empirical evidence to develop scientific arguments

• Memorizing the periodic table

• Learning about chemical reactions

Open Ended

How can constructing tables and graphs help students understand the relationship between force, mass, and acceleration?

Multiple Choice

According to Newton's Second Law of Motion, what two factors determine the acceleration of an object?

• Net force and mass

• Velocity and time

• Distance and speed

• Friction and gravity

Open Ended

What is an example of an everyday phenomenon that can be explained using Newton's Second Law of Motion?

Open Ended

What are some ways you can use the periodic table to identify atoms in chemical reactions, and why is it important to understand the conservation of mass in these reactions?