Chemical reactions, readiness test

What is the difference between a chemical change and a physical change?

• A physical change forms a new substance with different properties. While in a chemical change, the materials remain the same.

• A chemical change forms a new substance with different properties. While in a physical change, the materials remain the same.

• A physical change forms a new substance from the combined substances and it may change its form, such as by bending, melting, or folding.

• A chemical change forms a different shape, such as by bending, folding, or melting, but does not form a new substance with different properties.

Tags

NGSS.MS-PS1-5

Which of the following statements is true based on the law of conservation of mass?

• The weight of a crushed cookie is less than the weight of a whole cookie.

• A mixture weighs the same as the weight of all the parts of the mixture.

• The ingredients in a salad weigh more than the salad as a whole.

• A frozen ice pop weighs more than a melted ice pop.

Tags

NGSS.MS-PS1-5

Which of the following matches the correct example to it´s type

• Chemical Change: my feet got manicured

• Chemical Change: My microwave exploded

• Physical Change: My homework burned in a fire

• Chemical Change: My dog decided to bite my homework

Tags

NGSS.MS-PS1-2

Two liquids are mixed, as a result, a solid is formed. This is evidence of..

• chemical property

• Chemical reaction

• physical change

• physical property

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

An example of a chemical property is reactivity. This is

• an indicator of how easily a substance catches fire. This creates a new substance 

• a measure of how easily a substance combines with other substances  

• The likelyness of the substance to release toxic gas under certain conditions

• the danger to your health caused when a poisonous substance combines with chemicals in your body 

Tags

NGSS.HS-PS1-1

 A group of atoms bonded together. 

• Molecule

• Subscrit

• Macromolecules

• compounders

Tags

NGSS.MS-PS1-1

What is the left part of a chemical equation called?

H_{2 +} O → H₂O

• Products

• Coeficient

• Reactants

• subscript

Making a wool sweater from the sheep means there is a __________ change happening, because __________

• Chemical/ there was a change in the presentation of the material

• Physical/ the sweater is the same wool from the sheep.

• Physical/ the wool had to be treated to adquire it´s properties but is sill wool

• Chemical/ the wool of the seep is not the same that is in our fabric, it´s treated

The apple that becomes brown is a physical change

• True, because the apple is still an apple, the browning is mere aesthetic

• False, the browning happens because oxygen gets into the apple and becomes rusty

• False, the apple rots very quickly and that is a chemical change

• True, nothing else in the apple changes besides the color

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The milk got rotten and is now cheese, a chemical change appeared

• True

• False

• false, a chemical reaction is what happened

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5