NGSS.MS-PS1-2

(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 (NaCO₃) 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.

Tags

NGSS.MS-PS1-2

How does acid rain affect the pH of a stream or lake?

• The pH decreases.
• The pH increases.
• Acid rain does not affect pH.
• It causes an explosion.

Tags

NGSS.MS-PS1-2

What is the definition of chemical change?

• any change that results in the formation of new chemical substances. 
• changing clothes
• matter cannot be created or destroyed, only change form
• changes affecting the form of a chemical substance, but not its chemical composition.

Tags

NGSS.MS-PS1-2

Hydrochloric acid reacts with potassium hydroxide to produce a salt, water,and heat.

• Chemical Change
• Physical Change

Tags

NGSS.MS-PS1-2

A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?

• The level of the substance in the beaker is higher after the other liquid is added.
• A yellow solid forms and then settles to the bottom of the beaker.
• Small white crystals are left behind in the flask that held the first liquid.

Tags

NGSS.MS-PS1-2

A substance is found to have the following characteristics:

Very bitter taste

Feels slippery to the touch

Produces OH- ions when dissolved in water

In what category would the substance be classified?

• acid

• base

• enzyme

• fatty acid

Tags

NGSS.MS-PS1-2

When calcium reacts with water, the temperature changes from 18°C to 39°C. Which statement is correct?

• The solution at the end is acidic

• The reaction is reversible

• The reaction is exothermic

• The reaction is endothermic

Tags

NGSS.MS-PS1-2

What effect does observing the physical properties of a substance have on the substance?

• Measuring physical properties changes the chemical identity of the substance

• Observing physical properties has no effect on the substance

• It makes to substance develop a deep seeded distrust of humans

• The substance will undergo an exothermic reaction

Tags

NGSS.MS-PS1-2

What is a product (in chemical reactions)?

• Something a company will try to sell to you

• Also a potato

• When the mitosis space-time folds into a tetrahedron flux-capacitor

• The substance(s) that are created after a chemical reaction

Tags

NGSS.MS-PS1-2

What chemical will be formed from the combination of a hydrogen ion (H⁺) and a hydroxide ion (OH^-)?

• Hydrogen Peroxide

• Table Salt

• Table Sugar

• Water

Tags

NGSS.MS-PS1-2