Maroon
Q1. Which model contains a mixture of an element and a compound?
C. S
Q6. Which two are examples of elements?
nitrogen (N),
hydrogen (H)
11. A student wants to conduct an investigation to describe a chemical property that could be used to distinguish between two compounds. Which investigation would work best?
C.
An investigation comparing which of the two compounds is combustible
21. Which best describes a chemical reaction that follows the law of conservation of matter?
A. The reactants have the same mass as the products.
30. Carter is preparing a mug of hot chocolate. He stirs the drink with a metal spoon and notices that the handle of the spoon is heating up. What process of thermal energy transfer is responsible for creating the increased temperature of the metal spoon?
A. conduction
Q2. Which substances are compounds?
D. baking soda, sugar, and water
Q7. A) Which best identifies the type of substance in the container?
B) Which description of the substance best supports the choice from Part A?
A)
heterogeneous mixture
D)
There is not uniform composition throughout
12. Which of the following is a physical property of sodium?
A.
density
22. HCl + NaOH --> NaCl+ H2O
According to the law of mass conservation, what mass of NaCl forms if 18 grams of H2O is produced?
C. The mass of NaCl formed is 58.5 grams.
According to the law of conservation of mass, the total mass of the reactants equals the total mass of the products. In the reaction, the total mass of the reactants is 36.5 g + 40 g = 76.5 g. The mass of NaCl produced can be found by subtracting the mass of H2O produced from the total mass of the reactants: 76.5 g – 18 g = 58.5 g.
25. A student observes the model and claims that the total mass of the reaction is conserved. Is the student's claim correct? Why or why not?
C.
Yes, because the number of atoms of each element is the same on both sides of the equation.
Q3. Which substances are elements?
C. copper, magnesium, and zinc
Q8. When you heat a sample of a gas, what happens to the particles that make up that gas?
A.
They move faster and spread apart.
16. Based on the information in the periodic table, which element is shown in the picture?
C.
carbon (C)
27. According to the law of conservation of energy, what happens to mechanical energy if it is not used to move an object?
A.
It is converted into another form of energy.
13. Select two events that represent chemical changes that occur as a candle burns.
A.
Heat and light are produced.
C.
Black smoke rises from the flame.
Q4. Which diagram shows the particles of a homogeneous mixture?
D.
Q9. What is the most likely reason that the red liquid inside of a thermometer moves up when it is heated?
B. The particles in the red liquid move faster and spread apart.
Q.17 Based on this information, which model best represents a neutral lithium atom for the poster?
B. A neutral model of lithium should have three electrons, four neutrons, and three protons.
28. Byrd has a mug of coffee at a temperature of 93°C. He sets the mug on a counter in a room with an air temperature of 25°C. What is most likely to happen to the temperature of the coffee?
A.
The hot coffee will transfer thermal energy into the air, and the energy transfer will continue until the coffee is at room temperature
14. Which of the following provides proof of a chemical change?
B.
Frying an egg is a chemical change because the egg will not turn back into a liquid once it is cool.
Q5. Which statement best describes the substance in each model?
A. Model A is a pure substance because it has a definite chemical composition, while Model B is a mixture because it does not.
10. Which investigation could show a chemical property of iron?
B.
Investigating how iron can conduct electricity and heat.
19. Which table correctly matches each particle with its location and charge?
C. An atom contains protons, which carry a positive charge, and neutrons, which carry a neutral charge, inside its nucleus. An atom also has electrons surrounding the nucleus that hold a negative charge.
29. Roseanne heated a solution in a beaker as part of a laboratory experiment on energy transfer. After a while, she noticed the liquid solution begin to circulate within the beaker. What process involving heat transfer did Roseanne observe inside the beaker?
B.
convection
15. Which example is the best evidence of a chemical change?
B.
iron that turns reddish-brown when it rusts because a new substance is formed