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In a chemistry lab, which two jars out of the following hold mixtures?

• JAR H AND JAR I

• JAR J AND I

• JAR K AND JAR L

Which of the following are elements?

• Copper, Magnesium and Zinc

• Baking soda, Sugar and Water

Imagine you are a scientist and you have a substance from your recent experiment. How can this substance in step 1 be BEST classified?

• a compound of iron and sulfur

• a mixture of iron and sulfur

• a element made of iron and sulfur

• a percipitate made of iron and sulfur

In a chemistry lab, you are given four different models labeled as Q, R, S, and T. Which model represents a pure compound?

• Model Q

• Model R

• Model S

• Model T

Which models represent individual molecules

• R AND S

• U AND V

• R and T

• S AND U

Imagine you are a scientist studying the structure of an atom. Which answer choice correctly assigns the proton, neutron, and electron to their correct positions within this atom?

• 1. The two different-colored spheres within the nucleus represent the neutron and the electron. The third sphere, outside the nucleus, represents the proton.

• 1. The two different-colored spheres within the nucleus represent the proton and the neutron. The third sphere, outside the nucleus, represents the electron.

• 1. The two different-colored spheres within the nucleus represent the proton and the neutron. The third sphere, outside the nucleus, represents the proton.

• 1. The two different-colored spheres within the nucleus represent the proton and the electron. The third sphere, outside the nucleus, represents the neutron.

Imagine you are a scientist studying the sun. You are trying to understand the composition of helium atoms, which are abundant in the sun. Which of the following correctly describes the makeup of a helium atom?

• 2 protons

  2 neutrons

  2 electrons

• 2 protons

  2 neutrons

  4 electrons

• 2 protons

  4.26 neutrons

  2 electrons

• 4 protons

  4 neutrons

  4 electrons

Correctly draw a model that represents the element Carbon.

Remember carbon has two energy shells, 6protons, 6 neutrons and 6 electrons

You draw an atomic model of the element oxygen. What will you include in your drawing? Choose the 3 correct answers.

• 1. eight neutrons in the nucleus

• eight protons in the nucleus

• 1. eight electrons outside of the nucleus

• 1. sixteen electrons outside of the nucleus

• 1. sixteen neutrons in the nucleus