TEKS 8.6B Lesson

TEKS 8.6B

Multiple Choice

How is texting similar to writing chemical equations?

• Both use symbols and abbreviations to convey information quickly.

• Texting is only for social communication, while chemical equations are for science.

• Texting uses complete sentences, while chemical equations do not.

• Chemical equations are always longer than text messages.

Multiple Choice

Which of the following best describes the purpose of a chemical equation?

• To show chemical reactions with formulas and symbols instead of words.

• To list all the elements in the periodic table.

• To describe the physical properties of compounds.

• To explain the history of chemistry.

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Dropdown

Examine the experiment shown, then fill in the blanks.



The experiment shows a ​

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system.

The mass at the end of the experiment will be ​

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the initial mass.

Multiple Select

Which of the following statements are true about balancing chemical equations?

• The number of atoms for each element must be the same on both sides of the equation.

• Coefficients are used to balance atoms in a chemical equation.

• The subscripts in chemical formulas can be changed to balance equations.

• Balancing equations ensures the law of conservation of mass is followed.

Multiple Choice

Is mass conserved in the reaction 2H₂ + O₂ → 2H₂O?

• Yes, because the number of atoms of each element is the same on both sides.

• No, because the number of atoms changes.

• No, because energy is lost.

• Yes, because water is formed.

Dropdown

In the equation: CH₄ + H₂O → CO + H₂, the reactants have​

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, and the products have ​

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Multiple Choice

Use the periodic table of the elements to determine which of the following four elements is present in the chemical reaction.

2H2O+2NaCl2NaOH+Cl2+H2

• carbon

• nickel

• nitrogen

• sodium

Dropdown

The Law of Conservation of Mass states that matter, as measured by mass, cannot be​

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( or destroyed. In a chemical reaction, the ​

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after the reaction must be the same as before the reaction. The atoms that make up the matter in the reactants are ​

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but new ​

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are not formed.

Open Ended

Does the following equation support the Law of Conservation of Mass? Explain your answer.

$$4KClO_3\longrightarrow\ 2KClO_4+KCl$$

Multiple Choice

Which of the following statements best describes the law of conservation of mass?

• Atoms are not created or destroyed in a chemical reaction.

• Atoms can be created in a chemical reaction.

• The number of atoms can change during a reaction.

• Mass is only conserved in physical changes.

Multiple Select

Which elements are involved in the decomposition of CaCO₃?

• calcium

• carbon

• oxygen

• chlorine

Multiple Choice

and is the equation CaCO₃ → CaO + CO₂ balanced?

• Yes, it is balanced.

• No, it is not balanced.

Open Ended

How does the periodic table help you understand chemical reactions?

Open Ended

What strategies helped you balance equations?