Endothermic reactions...

have higher energy in their reactants than the products

have higher energy in their products than their reactants

Students react baking soda & vinegar. Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?

The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.

Bubbles were produced during the reaction, which meant that a gas was being produced.

The plastic bag did not change in any way, indicating that it was not involved in the reaction.

The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.

When CaCO 3 is heated, it forms CaO and CO 2 . Which of these statements best describes the mass of the products if 100 g of CaCO 3 is heated?

The sum of the products’ masses equals the mass of the CaCO 3

The difference in the products’ masses is equal to the mass of the CaCO 3

The sum of the products’ masses is less than the mass of the CaCO 3

The mass of each product is equal to the mass of the CaCO 3

A group of atoms bonded together

Basic unit of a chemical element

Suppose a reaction were to happen in an open container in a lab. During the reaction, the scientist observes the chemicals bubble, and produce a gas. During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g. Explain what happened.

The gas that was produced was not able to be weighed since the container was open.

His chemical reaction defied the law of conservation of mass

The product destroyed mass during the reaction

The reactants created matter during the reaction

10 g of a solid chemical reacts with a 10 g of a liquid chemical, the reaction bubbles and changes the color of the liquid. The colored liquid weighs 13 g, what can be concluded?

The gas produced from the bubbles weighed 5 g

The bubbles were evidence of 7 g of matter being destroyed

Law of Conservation of Mass

Authored by Latisha King

Chemistry

8th Grade

NGSS covered

Used 907+ times

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MULTIPLE CHOICE QUESTION

30 sec • 12 pts

What is the Law of Conservation of mass?

Mass is created in a chemical reaction

Mass is created in a physical change

New chemicals formed from a chemical reaction have a larger overall mass than the original reactants

Mass is never created or destroyed

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?

14g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?

14g

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The number in front of a compound or element is a

Subscript

Coefficient

Superscript

Charge

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The number to the lower side of an element is a

Subscript

Superscript

Coefficient

Charge

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Matter can not be created nor destroyed: it can only be

Destroyed a little bit

Invisible

Transformed, changed

None of the above

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which is Chemical Equation is Balanced?

CH₄+O₂------CO₂+2H₂O

H₂+O₂-----2H₂O₄

4Al+3O₂-----2Al₂O₃

Tags

NGSS.MS-PS1-5

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Law of Conservation of Mass

What is the Law of Conservation of mass?

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?

The number in front of a compound or element is a

The number to the lower side of an element is a

Matter can not be created nor destroyed: it can only be

Which is Chemical Equation is Balanced?

How many nitrogen atoms does NH₃ have?

Is this equation balanced or unbalanced?
2Fe₂O₃ + 3C --> 4Fe + 3 CO₂

How many oxygen atoms are in this chemical formula?

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

Law of Conservation of Mass

What is the Law of Conservation of mass?

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?

The number in front of a compound or element is a

The number to the lower side of an element is a

Matter can not be created nor destroyed: it can only be

Which is Chemical Equation is Balanced?

How many nitrogen atoms does NH3 have?

Is this equation balanced or unbalanced? 2Fe2O3 + 3C --> 4Fe + 3 CO2

How many oxygen atoms are in this chemical formula?

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

How many nitrogen atoms does NH₃ have?

Is this equation balanced or unbalanced?
2Fe₂O₃ + 3C --> 4Fe + 3 CO₂