Physical Science Matter

Which best describes a solid produced in a solution during a chemical reaction?

• acid

• solute

• reactant

• precipitate

One-half cup of baking soda is placed inside a plastic bag containing one cup of vinegar. Which best describes the evidence that a chemical reaction is taking place?

• The substance boils and changes state of matter.

• Bubbles are created, and a new substance is formed.

• The final result of the reaction is a vinegar and baking soda mixture

• The vinegar and the baking soda remain unchanged after the reaction.

Tags

NGSS.MS-PS1-2

The equation shows a reaction between sodium (Na) and water (H₂O). Which best explains why the equation is not balanced?

• There is too much sodium in the reactants.

• There is not enough water in the reactants.

• There is too much hydrogen gas in the products.

• There is not enough sodium hydroxide in the products.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is the correct way to balance the chemical equation shown below? Al + O₂ --> Al₂O₃

• 2Al + O₂ --> Al₂O₃

• 2Al + 3O₂ --> Al₂O₃

• 4Al + 3O₂ --> Al₂O₃

• 4Al + 3O₂ --> 2Al₂O₃

Tags

NGSS.MS-PS1-5

Which best describes a chemical reaction applying the law of conservation of mass?

• an equation which uses energy

• an equation which does not use energy

• a balanced equation in which the reactants and products are equal

• an unbalanced equation in which the reactants and products are unequal

Tags

NGSS.MS-PS1-5

An experiment was conducted to test the law of conservation of mass. At the end of the experiment, only 82% of the mass of the initial reactants was present. The experiment was repeated three times with similar results. Which best explains why some of the mass was lost?

• The mass escaped as a gas.

• The mass transformed into a liquid.

• The mass remained a part of the reactant.

• The mass turned into a heavier chemical.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which best describes a compound?

• the simplest form of matter

• an element that has changed state

• a physical mixture of chemicals and elements

• a chemical combination of two or more elements

Which is most likely to be a mixture?

• substance formed when one atom combines with another atom of the same element

• substance formed when one atom combines with an atom of another element

• solution formed when one substance chemically combines with another

• solution formed when one substance dissolves in another

A substance contains two components joined by physical means. Which best describes the substance?

• element

• compound

• mixture

• molecule

The figure shows how information about a specific element is represented on the periodic table. What information does the symbol "B" give about the element?

• It tells the element's atomic mass.

• It tells the atomic density of the element.

• It tells the chemical symbol of the element.

• It tells the element's number of protons and electrons.

Tags

NGSS.MS-PS1-1