(8.5E) The scientist spilled a few drops of dilute hydrochloric acid (HCl) on a lab table. For safety purposes, the scientist sprinkled some baking soda (NaCO 3 ) onto the spill. Which observation would provide the best evidence that a chemical reaction occurred?

The baking soda and hydrochloric acid combined, and bubbles formed.

The baking soda absorbed the hydrochloric acid.

Some of the baking soda dissolved in the hydrochloric acid.

The hydrochloric acid evaporated, leaving only the baking soda.

(8.5E)A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction?

Gas is produced as the sugar turns black.

Heat is added to the sugar crystals.

The sugar melts and becomes a liquid.

The temperature of the sugar increases

(8.5A) In the early 1900s many scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance. Then Ernest Rutherford completed an experiment that changed the concept of an atom. His discovery led to the understanding that an atom consists mostly of empty space with-

electrons orbiting a dense nucleus made of protons and neutrons

protons orbiting a dense nucleus made of electrons and neutrons

neutrons and protons orbiting a cloud of electrons

electrons and protons orbiting a cloud of neutrons

How is a physical change different from a chemical change?

Chemical changes produce a new substance, physical changes stay the same substance

There is absolutely no difference

Chemical changes create and destroy matter, physical changes don't

Physical changes create and destroy matter, chemical changes dont

For an investigation a student pours a blue solution into a beaker. The student then places a shiny, silver-colored strip of zinc into the solution. The strip of zinc had a dark, solid form on it and small solid pieces broke off of it and settled to the bottom of the beaker. The student inferred that a chemical reaction occurred. What evidence supports this?

The zinc metal remained silver and shiny

The solution turned blue when the zinc was added

What is found in the nucleus of atoms?

Protons, neutrons, and electrons.

What is the atomic number?

The number of protons in an element

The number of neutrons in an element

The number of protons and neutrons.

The number of protons and electrons.

Felipe is observing how acetic acid (vinegar) and sodium bicarbonate (baking soda) react with one another in a volcano model. What evidence can Felipe look for to indicate a chemical reaction has taken place?

The volume of the acetic acid increases.

The density of the baking soda decreases.

A chemical reaction occurs when a blue liquid and a yellow liquid are mixed in a bag. Which of the following would NOT be evidence of a chemical reaction?

The bag starts to feel warm to the touch

A precipitate forms at the bottom of the bag

The bag expands as a gas is produced inside

Chemical Reactions

Authored by HETHER KEY

Chemistry

8th Grade

NGSS covered

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MULTIPLE CHOICE QUESTION

5 mins • 1 pt

For an investigation a student poured a blue solution of CuSO₄ into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes.
The student inferred that a chemical reaction occurred. What evidence supports this inference?

A dark solid formed on the zinc metal.

The zinc metal remained silver-colored and shiny

The CuSO₄solution turned blue when the zinc metal was added.

None of these

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

1 min • 12 pts

Which of the following is an example that includes evidence of a chemical reaction?

A sample of zinc is placed in water and it settles to the bottom

A solid block of ice is heated and it completely melts into a liquid.

Sugar that is burned gives off an odor and turns brown and then black.

A tomato is placed into a blender and chopped up into smaller pieces.

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The smell made from a decomposing fish.

Chemical Change

Physical Change

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following could indicate a chemical change?

All of the answers could indicate Chemical Change

a color change has occurred

bubbles appear

identifying one or more new chemical products

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a PHYSICAL change?

Getting a haircut

Rusty metal

sour milk

A compound

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following IS a chemical change

using chalk

water freezing

slicing cheese

digestion

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the law of conservation of mass?

Matter changes when reacted or changed.

The mass of all reactants are changed during a physical or chemical change

The mass of the reactants is the same as the mass of the products

The mass of the products is different than the mass of the reactants.

Tags

NGSS.MS-PS1-5

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Chemical Reactions

For an investigation a student poured a blue solution of CuSO₄ into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes.
The student inferred that a chemical reaction occurred. What evidence supports this inference?

Which of the following is an example that includes evidence of a chemical reaction?

The smell made from a decomposing fish.

Which of the following could indicate a chemical change?

Which of the following is a PHYSICAL change?

Which of the following IS a chemical change

What is the law of conservation of mass?

How many elements are in C₆H₁₂O₆?

Can matter be created or destroyed?

What is the Law of Conservation of mass?

Access all questions and much more by creating a free account

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Chemical Reactions

For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes.The student inferred that a chemical reaction occurred. What evidence supports this inference?

Which of the following is an example that includes evidence of a chemical reaction?

The smell made from a decomposing fish.

Which of the following could indicate a chemical change?

Which of the following is a PHYSICAL change?

Which of the following IS a chemical change

What is the law of conservation of mass?

How many elements are in C6H12O6?

Can matter be created or destroyed?

What is the Law of Conservation of mass?

Access all questions and much more by creating a free account

Popular Resources on Wayground

Discover more resources for Chemistry

For an investigation a student poured a blue solution of CuSO₄ into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes.
The student inferred that a chemical reaction occurred. What evidence supports this inference?

How many elements are in C₆H₁₂O₆?