Topic: 8.5 Matter and Energy (1)
Quiz by Grade 8 Science - Texas Education Agency
Grade 8
Science (2017)
Texas Essential Knowledge and Skills (TEKS)
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21 questions
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- Q1A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?Silicon (Si)Arsenic (As)Sulfur (S)Nitrogen (N)60s8.5c
- Q2A model of an atom is shown below. An atom of which element is represented by this model?Sodium (Na)Neon (Ne)Carbon (C)Boron (B)60s8.5b
- Q3Which of the following best describes an electron?It has a positive charge and much more mass than a neutron.It has a negative charge and about the same mass as a neutron.It has a negative charge and much less mass than a proton.It has no charge and about the same mass as a proton.60s8.5a
- Q4Which information could a student determine from only the chemical formula of a protein?The number of atoms of each element in the proteinThe physical arrangement of atoms in the structure of the proteinThe color of the proteinThe number of molecules in each sequence that makes up a protein60s8.5d
- Q5A teacher asks a student to write the chemical equation for photosynthesis. The student’s response is shown below. The equation is not balanced correctly. Which of these is a balanced equation for photosynthesis?#texas/42f49aba-ff70-48a8-84e8-a30523320ff9/C.png#texas/42f49aba-ff70-48a8-84e8-a30523320ff9/D.png#texas/42f49aba-ff70-48a8-84e8-a30523320ff9/A.png#texas/42f49aba-ff70-48a8-84e8-a30523320ff9/B.png60s8.5e
- Q6When 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?The total number of particles in the nucleus of the unknown elementThe number of protons in the nucleus of the unknown elementThe total number of neutrons in the unknown elementThe number of valence electrons in the unknown element60s8.5b
- Q7The model of the periodic table below shows the locations of four elements. A student is asked to identify an element that is a pale-yellow brittle solid and does not conduct electricity. At which location in this periodic table would the element most likely be found?234160s8.5c
- Q8An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom’s nucleus?30−2525−3060s8.5a
- Q9Users enter free textType an Answer60s8.5d
- Q10The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?The element is sodium, and it is not very reactive.The element is sodium, and it is highly reactive.The element is fluorine, and it is not very reactive.The element is fluorine, and it is highly reactive60s8.5b
- Q11An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature, this element is a very stable gas. How many neutrons are in this atom? Be sure to use the correct place value.Users enter free textType an Answer60s8.5a
- Q1260s8.5e
- Q13The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed below. Which of these elements is in this group?AluminumStrontiumSiliconLithium60s8.5c
- Q14Which of these formulas contain equal numbers of nitrogen atoms?Formulas I and IIIFormulas II and IIIFormulas I, II, and VFormulas I and IV60s8.5d
- Q1560s8.5d
