NaHCO3+HC2H3O2→NaC2H3O2+H2O+CO2
A student mixes baking soda (NaHCO3) and acetic acid (HC2H3O2) to produce a chemical reaction shown. Which statement about the reaction is correct?
(1 point)
Responses
Atoms of Na are destroyed during the reaction.
Atoms of Na are destroyed during the reaction.
Some atoms gain mass after the reaction.
Some atoms gain mass after the reaction.
The atoms of the reactants are regrouped during the reaction.
The atoms of the reactants are regrouped during the reaction.
There are more H atoms after the reaction.
The atoms of the reactants are regrouped during the reaction.
Use the chemical reaction to answer the question.
2H2+O2→2H2O
There are four atoms of hydrogen (H) before the reaction. How many atoms of hydrogen are present after the reaction?
(1 point)
Responses
5
5
8
8
2
2
4
There are four atoms of hydrogen (H) before the reaction, and after the reaction, there are still four atoms of hydrogen.
Students are called by their teacher at the beginning of the year. Expectations are reviewed by the teacher to help set the students up for success. Lessons should be completed by students on the day they appear on the planner.
Use the passage to complete the following questions.
Rewrite the paragraph so that all the sentences are in active voice.
The teacher calls the students at the beginning of the year and reviews expectations with them to help set them up for success. The students should complete lessons on the day they appear on the planner.
The dancer (to practice) for many hours each day before a performance. She (to move) to the rhythm of music. She (to dance) across the stage, (to hear) the applause, and (to take) her final curtsy.
Use the passage to complete the following questions.
Rewrite the paragraph using the verbs provided to make the subject and verb agree.
The dancer practices for many hours each day before a performance. She moves to the rhythm of music. She dances across the stage, hears the applause, and takes her final curtsy.
What does it mean to solve an equation, have the variables cancel out, and have the answer be 3=3, for example?
*
1 point
When an equation is solved, it means that the value of the unknown variable(s) in the equation is determined. In the case where the variables cancel out and the answer is 3=3, it means that the equation is true for all values of the variable(s). In other words, any value of the variable(s) that satisfies the equation will result in both sides of the equation being equal to each other.
What does it mean to solve an equation, have the variables cancel out, and have the answer be 3=3, for example?
*
1 point
one solution
infinite solutions
no solution