DCA 1 Review

Front

How should the mass of the balloon/flask complex after the reaction relate to the mass of the balloon/flask complex before the reaction?

Back

The mass should be the same since matter is neither created nor destroyed.

Front

Which of the following statements accurately describes the chemical formula for a molecule of acetaminophen, C₈H₉NO₂?

Back

There are 20 total atoms involved in the chemical formula for a molecule of acetaminophen.

Front

Ammonia, NH₃, is a common chemical compound used in cleaning products and fertilizers. Which statement describes the atoms present in THREE molecules of ammonia?

Back

Three molecules of ammonia would contain 3 atoms of nitrogen and 9 atoms of hydrogen.

Front

How does the chemical equation for photosynthesis (6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂) show that mass is conserved during the reaction?

Back

The number and type of atoms on both sides are the same, showing that atoms are rearranged, not created or destroyed.

Front

Where on the periodic table could an element with these properties be placed? - Very highly reactive - Shiny - Excellent conductor of electricity and heat - Commonly found in nature mixed with other elements

Back

Location A

Front

How many grams of vinegar (acetic acid, CH₃COOH) were used in the reaction? Reactants and products: NaHCO₃: 84 g, CO₂: 44 g, H₂O: 18 g, CH₃COONa: 82 g.

Back

82 g

Front

A student mixes two unknown solutions together and observes an unexpected change in ________. The student claims that a new substance ________ formed.

Back

color, was

Front

Which elements are represented in the formula Ca(NO₃)₂ AND how many atoms of each element are represented?

Back

Calcium: 1, Nitrogen: 2, Oxygen: 6

Front

Which of the following is an example of a chemical change?

Back

Rust forming on a car door

Front

The result of two liquids forming a solid is called:

Back

a precipitate