8.5B Staar Aligned Exit Ticket Quiz PDF

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TEKS 8.5B Exit Ticket Quiz 1. A chemist made the table below to record some atomic properties of four elements.

Based on the information in the table, which conclusion about the chemical reactivity of these elements is valid? A) Boron is the most reactive because it has the most protons. B) Fluorine is the most reactive because it has 7 electrons in the outer shell. C) Silicon is the most reactive because it has an equal number of protons and neutrons. D) Gallium is the most reactive because it has many more neutrons than protons.

2. Four students were asked to name the parts of an atom that determine the atom’s identity and chemical properties. The students’ responses are shown in the table below. Which student’s responses are correct?

3. Tin, Sn, is a soft white metal. It has a low melting point compared with other metals. Tin is widely used as a coating for cans of food. Which statement accurately describes atoms of tin? A) Tin atoms have five valence electrons. B) Tin atoms have 119 neutrons. C) Tin has 50 protons. D) Tin atoms have 68 electrons.

4. The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes it chemical reactivity? A) The element is sodium, and it is not very reactive. B) The element is fluorine, and it is not very reactive. C) The element is sodium, and it is highly reactive. D) The element is fluorine, and it is highly reactive.

5. A chemist is identifying the elements present in a sample of seawater. What characteristic of an element’s atoms always determines the element’s identity? A) The number of valence electrons B) The location of valence electrons C) The number of protons D) The number of neutrons

Use the model below to answer questions 6-8.

6. An atom of which element is represented by this model?

7. How many valence electrons are present is this model?

8. Is the model reactive or stable? Explain your answer.

9. When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with? A) The total number of neutrons in the unknown element. B) The total number of particles in the nucleus of the unknown element. C) The number of protons in the nucleus of the unknown element. D) The number of valence electrons in the unknown element....