Physical and Chemical Changes

Which of the following BEST describes the definition of physical change?

• A change in size only.

• A change in size and shape.

• Change in the chemical composition of the object that creates a new substance.

• A change in size, shape, state, color or appearance that does not crate a new substance.

Which of the following examples is a good indication that a physical change has occurred?

• New substance was created.

• There is a change in odor and the color of the substance.

• There is a change in the size of the object.

• There is a sudden change in the temperature of the solution.

Tags

NGSS.MS-PS3-4

Which of the following an example of physical change?

• Chopping wood into smaller pieces.

• Burning wood to create ash.

• Mixing sodium and water that creates a sudden change in temperature and an explosion.

• Burning rocket fuel to move the space shuttle in orbit.

Which of the following are examples of physical changes?

• Chewing food inside your mouth.

• Mixing water and salt to create salty water.

• Nails rusting after being exposed to water and oxygen.

• Cutting paper into smaller pieces.

• Freezing water to create ice cubes.

A teacher rubbed a match against a piece of sandpaper. The match started to burn. Which statement is true?

• The match underwent a physical change because it started to burn and there was change in the composition of the substance.

• The match underwent a chemical change because it started to burn which indicates that there was a creation of a new substance.

• The match underwent a chemical change because the match color changed from red to black after burning.

• The match underwent a physical change because the size of the match changed after burning.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The photograph shows rockets carrying a space shuttle off the launchpad. The main source of fuel for this shuttle is liquid nitrogen and liquid hydrogen. Both are mixed and are burned together to power the main rocket engines. When the fuel ignites to create an upward motion for the shuttle, choose the correct statement that best describe the changes occurring.

• As the fuel burns, energy is released to create an upward motion of the shuttle. This is an example of physical change because the color of the fuel changed.

• As the fuel burns, energy is released to create an upward motion of the shuttle. This is an example of physical change because the size of the fuel particle changed.

• As the fuel burns, energy is released to create an upward motion of the shuttle. This is an example of chemical change because two chemicals react to ignition, which in return changes their composition to a new substance.

• As the fuel burns, energy is released to create an upward motion of the shuttle. This is an example of chemical change because the liquid nitrogen changes to gas.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is the BEST definition of chemical change?

• Chemical changes are changes in the state, size, and shape of substances.

• A chemical change takes place when the color and the size of the object changes.

• A chemical change is a change in the physical state of matter.

• A chemical change takes place when one or more substances change to form one or more new substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following are examples of chemical change?

• The combination of Sodium(Na) and Chlorine(Cl) to create NaCl or table salt.

• Heating a pot of water to change the state of water from liquid to gas.

• Mixing potassium chloride and silver nitrate creates solid particles in the liquid solution.

• Folding paper to create a paper airplane.

• Digestion of food.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is not an evidence of a chemical change occurring?

• New substance has formed.

• Change is size and shape.

• Change in odor

• Formation of precipitate

Tags

NGSS.MS-PS1-2

Students conducted an investigation using two different test tubes. One student combined Magnesium (Mg) in water, while the other student combined Magnesium (Mg) in Hydrochloric Acid (HCl). The observations made for each test tube is listed in the chart below. Which of the following statements is true?

• Test Tube 1 underwent a chemical change because the temperature of the water changed when the lit match was placed.

• Test Tube 1 underwent a physical change because the temperature of the water changed while there was no other observable activity.

• Test Tube 2 underwent a chemical change because bubbling occurred, the temperature changed, and the metal strip dissolved to form a new substance.

• Test Tube 2 underwent a physical change because the size of the metal strip changed and the lit match made a popping sound as the fire is extinguished,

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5