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WorksheetsChemistry Semester Review
Total questions: 16
Worksheet time: 10mins
Which of these sets of labels would correctly identify the diagrams in the pictures above?
Picture 1: animal cell Picture 2: plant cell
Picture 1: mixture Picture 2: solution
Picture 1: compound Picture 2: element
Picture 1: atom Picture 2: molecule
Rust is a compound with the formula Fe2O3. Which elements combine to form rust?
Iron and Water
Iron and Atoms
Iron and Oxygen
The compound potassium sulfate, K2SO4, is composed of
2 potassium, 1 sulfur, 4 oxygen
2 potassium, 4 sulfur, 4 oxygen
two molecules of potassium and one molecule of sulfate
one molecule of potassium and two molecules of sulfate
Which event is an example of a chemical change?
fog rising off a river
wood burning in a fireplace
ice cream melting in the sunshine
grinding peppercorn into pepper flakes
When iron combines with oxygen in a moist environment, rust forms because of a
chemical reaction
physical reaction
change in density
change in temperature
Which of these is an example of water changing from water vapor to liquid?
moisture forming on a mirror when you breathe on it
sweat forming on your body when you exercise
ice cubes melting when you put them in a warm liquid
rivers drying up during a very hot summer
The physical state of a substance depends on the arrangement of atoms or molecules within it. The diagram shows the arrangement of atoms of the same substance at two different times. At Time 1 the atoms are close together. At Time 2 the atoms are moving apart. Which statement BEST describes the change occurring from Time 1 to Time 2?
A gas becoming a solid
A gas becoming a liquid
A solid becoming a liquid
A liquid becoming a solid
Dry ice changes directly from a solid to a gas. Which term describes this type of change?
sublimation
evaporation
condensation
precipitation
Sodium sulfate and barium chloride react with each other to form sodium chloride and barrium sulfate as shown. Which statement MOST accurately describes the mass of the reactants comparred to the mass of the products?
The mass of the reactants is the same as the mass of the products.
The products have a greater mass because matter was created during the reaction.
The reactants have a greater mass because some of the mass was converted to heat.
The reactants have a greater mass because some of the matter was destroyed by the reaction.
When a mixture of oxygen and hydrogen is ignited in a test tube, the reaction shown occurs.
Hydrogen + Oxygen -----> Water + Energy
What happens to the total mass of the contents of the test tube?
The total mass increases.
The total mass decreases.
The total mass remains the same.
Part of the mass is changed to heat energy.
In the late 1700's, Antoine Lavoisier performed a series of experiments to find out what happened when a substance burned. In each experiment, he observed that the weight of a container and its contents was the same at the end of the experiment as it had been in the beginning. These observations led him to propose the law of
combustion
fixed proportions
conservation of mass
conservation of energy
Belinda investigated the reaction that occurred when two effervescent tablets were put into a beaker containing 100 mL of water. She observed that the tablets fizzed and released gas bubbles. The tablets dissolved. The temperature of the water went from 22oC to 19oC. Which is the BEST conclusion for this experiment?
The energy conversion that occurred in this beaker involved the nuclei of the atoms of the tablets.
An endothermic reaction occurred because heat energy was absorbed from the water.
A physical change occurred when the tablets dissolved in the water.
The gas came from boiling water in the beaker.
When coal burns, the reaction
releases heat and is endothermic
releases heat and is exothermic
absorbs heat and is endothermic
absorbs heat and is exothermic
Two chemicals are mixed in a test tube and a chemical reaction takes place. If this reaction is endothermic and the test tube is touched, which of the following BEST describes what is felt?
The test tube is cold.
The test tube is warm.
The test tube is very hot.
The test tube is the same temperature as the air,
A student placed a solid in a liquid, which produced the results shown in the following diagram. Which of the following MOST likely took place?
a chemical reaction
a phase change
a nuclear reaction
a destruction of mass
Explain your answer from question #15 further. Which explanation BEST describes why your answer to the last question is correct?
The atoms in the liquid and solid rearranged and formed new bounds and created a new substance.
The solid material melted into the liquid and formed a new mixture.
The nuclei of the atoms in the solid material fused together to make new elements.
The atoms in the solid material were destroyed.
