Which of these are broken down during chemical, but not physical, changes?

Which type of matter can be separated by physical means?

Which of the following is an example of a compound?

A student studies four chemicals in a laboratory investigation. Which chemical cannot be further broken down into other chemicals using ordinary

laboratory processes?

Which element has 7 valence electrons?

What do the atomic numbers represent?

What physical property is characteristic of all of the elements in the group located in the rightmost column of the periodic table?

Which pair of elements has the most similar properties?

Which characteristic of an element determines its placement in the periodic table?

Which element would best be described as a brittle, non-conductive solid?

Where are the most reactive metals located on the periodic table?

What is the significance of metalloids in the periodic table?

Which task in the kitchen is an example of a physical change?

As part of a study, a scientist observed a number of different molecular changes in matter. Which of the following observations provides evidence of a physical change?

A chemist observed bubbling and fizzing after adding an acid solution to a white powdery substance in a beaker. Which of the following can be inferred?

During photosynthesis, carbon dioxide and water combine according to the general equation in the picture. Why is photosynthesis a chemical reaction?

A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sound as gas bubbles were forming around it. Which conclusion is BEST supported by this observation?

Which best explains how the chemical reaction shown below follows the law of conservation of mass?

2H₂ + O₂ → 2H₂O

Sodium sulfate and barium chloride react with each other to form sodium chloride and barium sulfate as shown.

Which statement MOST accurately describes the mass of the reactants compared to the mass of the products?

Using a closed system, a student heats 100 milliliters (mL) of distilled water in a flask. The steam from the water is captured, cooled, and condensed as shown in the diagram.

How much water is MOST likely collected?

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?

What coefficient for O demonstrates the law of conservation of mass?

CH₂ (g) + __O₂(g) → CO₂(g) + 2H₂O(g)

Which set of coefficients will balance this chemical equation?

__C₂H₄(g) + __O₂(g) → 2CO₂(g) + 2H₂O(g)

Which is the correct way to balance the chemical equation shown below?

Al + O₂ → Al₂O₃

What is the pH range for an acid?

What is the pH range for bases?