TEKS Grade 8 Science - 8.5 Diagnostic - Atoms and Chemistry
Quiz by Grade 8 Science - Texas Education Agency
Grade 8
Science (2017)
Texas Essential Knowledge and Skills (TEKS)
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10 questions
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- Q1Which statement correctly describes the location and charge of the electrons in an atom?The electrons are outside the nucleus and have no charge.The electrons are outside the nucleus and have a negative charge.The electrons are inside the nucleus and have a negative charge.The electrons are inside the nucleus and have no charge.30s8.5a
- Q2How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?178 protons, 250 neutrons, 72 electrons72 protons, 106 neutrons, 72 electrons72 protons, 178 neutrons, 106 electrons106 protons, 72 neutrons, 106 electrons30s8.5a
- Q3When 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 number of protons in the nucleus of the unknown elementThe total number of particles in the nucleus of the unknown elementThe number of valence electrons in the unknown elementThe total number of neutrons in the unknown element30s8.5b
- Q4The 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 fluorine, and it is not very reactive.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 highly reactive30s8.5b
- Q5A 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?Sulfur (S)Nitrogen (N)Arsenic (As)Silicon (Si)30s8.5c
- Q6The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed. Which of these elements is in this group?StrontiumSiliconLithiumAluminum30s8.5c
- Q7Which information could a student determine from only the chemical formula of a protein?The physical arrangement of atoms in the structure of the proteinThe color of the proteinThe number of atoms of each element in the proteinThe number of molecules in each sequence that makes up a protein30s8.5d
- Q8In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?30s8.5d
- Q9Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?Oxygen is present.Coal is made up of more than one element.A new substance is produced.The shape of the coal changes.30s8.5e
- Q10During an investigation, a student combined the two clear, colorless solutions shown below. The student observed that the temperature changed from 25°C to 23°C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?One of the original compounds came out of solutionRapid evaporation of water occurred, leaving a solid.The solutions reacted chemically.Some of the water froze into ice crystals30s8.5e
