Chemical Reaction Changes

Front

What is most likely true about the yellow solid?

Back

It is a new substance with different properties.

Front

Which is the correct conclusion based on the data?

Back

A chemical reaction occurred because the chemicals that were combined have different boiling points than the chemicals produced.

Front

A teacher demonstrates with two sugar cubes: Cube A dissolves in 100 mL of water, while Cube B turns black over a flame and does not dissolve in water. What does this indicate?

Back

Burning sugar results in a chemical reaction.

Front

Which statement describes a change that occurs during a chemical reaction?

Back

Atoms in the original substances are arranged in a different way to make new substances.

Front

Which of the following is evidence that a chemical reaction has taken place in one of the processes? Sugar Water: Sugar is added to water, and the water is stirred until the sugar is no longer visible. Sugar Floss: Sugar is melted and blown with a fan to make thin threads of solid sugar. Sugar Caramel: Pure sugar is melted and cooked until it changes color and becomes a thick, sticky liquid. Rock Sugar: A highly concentrated solution of sugar water is prepared, large sugar crystals are allowed to form slowly, and then dye is added. Options: A. The slow growth of giant sugar crystals from a highly concentrated sugar-water solution and added dye, B. The color change that takes place after heat melts and begins to decompose the sugar, C. The dissolution of solid sugar in water to form a thin, colorless, odorless liquid, D. The melting and re-solidification of sugar into threads, which are different from sugar’s natural cube-shaped crystals.

Back

The color change that takes place after heat melts and begins to decompose the sugar.

Front

What is most likely true about the white solid formed when a clear liquid is mixed with a blue liquid in a beaker?

Back

It is a new substance with different properties.

Front

Calcium carbonate (CaCO3) is heated and decomposes to form calcium oxide (CaO) and carbon dioxide (CO2). What is the difference between calcium carbonate and calcium oxide?

Back

Calcium oxide has different physical properties and different chemical properties.

Front

Twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. According to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete?

Back

40 g

Front

What is true about the mass of the nitrogen atoms in this reaction?

Back

The mass of the nitrogen atoms in the reactants is equal to the mass of the nitrogen atoms in the products.

Front

What happens to the total mass of the atoms involved in a chemical reaction?

Back

It will stay the same no matter how the atoms are rearranged.