2nd semester EOC Review (circle or highlight the correct answer)
- Which of the following is NOT an example of a chemical change?
- A log burningA nail rusting An ice cube melting An apple rotting
- Why do scientists perform multiple trials of the same experiment?
- to include additional variables in the experiment
- to complete the steps of the experiment in less time
- to find a less expensive way to conduct the experiment
- to increase the likelihood of accurate experiment results
- Imagine that you could put popcorn kernels into an airtight popcorn popper and measure the mass of the popper with the kernels. After the popcorn has popped, the mass of the popper and the popcorn will be
- less than the original mass because popped corn is less dense than the kernels are
- equal to the original mass because the container is airtight
- greater than the original mass because the volume of the popped corn is greater than that of the kernels
- impossible to determine accurately without weighing each piece of popcorn immediately
- If a neutral atom loses an electron, what is formed?
- A gas An ion An acid A molecule
- Which object listed in the table has the greatest density?
- Abiodiu poured corn syrup into the bottom of an empty beaker. He carefully added a layer of glycerin, water, and oil, as shown in the diagram. He then dropped a plastic disk into the beaker.
- Colored alcohol is used in some glass thermometers. When placed in air of different temperatures, the column of alcohol rises or falls in the glass thermometer. Which of the following best explains why the height of the alcohol column changes?
- The glass contracts when heated.
- The alcohol contracts when heated.
- The glass expands more than the alcohol when heated.
- The alcohol expands more than the glass when heated.
- When a sample of a gas is heated at constant pressure, the average kinetic energy of its molecules
- decreases, and the volume of the gas increases
- decreases, and the volume of the gas decreases
- increases, and the volume of the gas decreases
- increases, and the volume of the gas increases
*diagram on the next page
- Mr. Jones set up a demonstration for his science class using two beakers. Each beaker contained 50 ml of a clear liquid. The temperature of each liquid was 25°C. Mr. Jones placed a cube into each beaker at the same time. Each cube measured 2 cm on all sides and had a mass of 5 grams.
- When Magnesium (Mg) metal is burned in the presence of Oxygen (O2), Magnesium oxide (MgO) is produced. The properties of Magnesium oxide are different than the individual properties of Magnesium and Oxygen because Magnesium oxide is
- a solution.a mixture. a compound. an element.
- Which of the following is the most important factor in determining an element's place in the periodic table?
- Number of protonsNumber of neutronsAtomic DensityAtomic Charge
- The pictures below show the position of different elements on the periodic table. Which picture has an X in the locations of the three elements that would be most similar in the way they react?
Why?
- What is the smallest particle of the element Gold (Au) that can still be classified as gold?
- atom molecule neutron proton
- Which of the following substances can be separated into several elements?
- Nitrogen Zinc Air Aluminum
- The table below shows some information for four different elements.
- Which best describes the current model of an atom?
- a solid sphere with electrons and protons embedded
- a solid sphere unique for everything that exists
- a central nucleus containing protons and neutrons with electrons orbiting in levels of high probability
- a central nucleus containing protons with electrons orbiting in specific paths
- The atomic number of iron is 26, and the atomic mass is 55.847. What do these numbers mean in regard to protons, electrons and neutrons?
- There are 26 each of protons and neutrons, and the rest of the mass is the result of electrons.
- There are 26 protons and 26 electrons. Some atoms of iron have 29 neutrons; the .847 shows that there is more than one isotope of iron.
- There are 26 protons and 29 neutrons. Each particle has an atomic mass of 1
- There are 26 protons and 26 neutrons. Since neutrons have slightly more mass than protons, the mass is greater than 52
- Which of the following models correctly represents the compound phosphorus trichloride (PCl3)?
The equation represents a chemical change because _____.
22. A student heated a 10 g sample of a compound in an open container. A chemical reaction occurred. The mass of the sample was measured again and found to be less than before. Which of the following explains the change in mass of the sample?
- The heat caused the compound to become less dense.
- The reaction gave off more heat than was added.
- Some of the lighter atoms were converted to energy.
- One of the reaction products was a gas.
23. Which of the following chemical equations is balanced correctly?
24. How many different elements are in the compound Sodium carbonate (Na2CO3)? ______
25. Which of the following represents a chemical reaction?
- a sugar cube dissolving in water
- ice cubes forming in a freezer
- ice cream melting in a bowl
- a cake baking in an oven
2nd semester EOC Review (with answers)
- Which of the following is NOT an example of a chemical change?
- A log burningA nail rusting An ice cube meltingAn apple rotting
- Why do scientists perform multiple trials of the same experiment?
- to include additional variables in the experiment
- to complete the steps of the experiment in less time
- to find a less expensive way to conduct the experiment
- to increase the likelihood of accurate experiment results
- Imagine that you could put popcorn kernels into an airtight popcorn popper and measure the mass of the popper with the kernels. After the popcorn has popped, the mass of the popper and the popcorn will be
- less than the original mass because popped corn is less dense than the kernels are
- equal to the original mass because the container is airtight
- greater than the original mass because the volume of the popped corn is greater than that of the kernels
- impossible to determine accurately without weighing each piece of popcorn immediately
- If a neutral atom loses an electron, what is formed?
- A gas An ionAn acid A molecule
- Which object listed in the table has the greatest density? (y)
- Abiodiu poured corn syrup into the bottom of an empty beaker. He carefully added a layer of glycerin, water, and oil, as shown in the diagram. He then dropped a plastic disk into the beaker.
- Colored alcohol is used in some glass thermometers. When placed in air of different temperatures, the column of alcohol rises or falls in the glass thermometer. Which of the following best explains why the height of the alcohol column changes?
- The glass contracts when heated.
- The alcohol contracts when heated.
- The glass expands more than the alcohol when heated.
- The alcohol expands more than the glass when heated.
- When a sample of a gas is heated at constant pressure, the average kinetic energy of its molecules
- decreases, and the volume of the gas increases
- decreases, and the volume of the gas decreases
- increases, and the volume of the gas decreases
- increases, and the volume of the gas increases
*diagram on the next page
- Mr. Jones set up a demonstration for his science class using two beakers. Each beaker contained 50 ml of a clear liquid. The temperature of each liquid was 25°C. Mr. Jones placed a cube into each beaker at the same time. Each cube measured 2 cm on all sides and had a mass of 5 grams.
- When Magnesium (Mg) metal is burned in the presence of Oxygen (O2), Magnesium oxide (MgO) is produced. The properties of Magnesium oxide are different than the individual properties of Magnesium and Oxygen because Magnesium oxide is
- a solution.a mixture. a compound. an element.
- Which of the following is the most important factor in determining an element's place in the periodic table?
- Number of protonsNumber of neutronsAtomic DensityAtomic Charge
- The pictures below show the position of different elements on the periodic table. Which picture has an X in the locations of the three elements that would be most similar in the way they react?
Why?A – because all element in the same column have the same number of valence electrons and will react similarly because of this
- What is the smallest particle of the element Gold (Au) that can still be classified as gold?
- atommolecule neutron proton
- Which of the following substances can be separated into several elements?
- Nitrogen Zinc AirAluminum
- The table below shows some information for four different elements.
- Which best describes the current model of an atom?
- a solid sphere with electrons and protons embedded
- a solid sphere unique for everything that exists
- a central nucleus containing protons and neutrons with electrons orbiting in levels of high probability
- a central nucleus containing protons with electrons orbiting in specific paths
- The atomic number of iron is 26, and the atomic mass is 55.847. What do these numbers mean in regard to protons, electrons and neutrons?
- There are 26 each of protons and neutrons, and the rest of the mass is the result of electrons.
- There are 26 protons and 26 electrons. Some atoms of iron have 29 neutrons; the .847 shows that there is more than one isotope of iron.
- There are 26 protons and 29 neutrons. Each particle has an atomic mass of 1
- There are 26 protons and 26 neutrons. Since neutrons have slightly more mass than protons, the mass is greater than 52
- Which of the following models correctly represents the compound phosphorus trichloride (PCl3)? First one
The equation represents a chemical change because _____.
22. A student heated a 10 g sample of a compound in an open container. A chemical reaction occurred. The mass of the sample was measured again and found to be less than before. Which of the following explains the change in mass of the sample?
- The heat caused the compound to become less dense.
- The reaction gave off more heat than was added.
- Some of the lighter atoms were converted to energy.
- One of the reaction products was a gas.
23. Which of the following chemical equations is balanced correctly?
24. How many different elements are in the compound Sodium carbonate (Na2CO3)? ____3_____
25. Which of the following represents a chemical reaction?
- a sugar cube dissolving in water
- ice cubes forming in a freezer
- ice cream melting in a bowl
- a cake baking in an oven