Fall Final Exam practice 8th grade science
Quiz by Nick Nobbe
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40 questions
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- Q1Which phrase BEST describes the periodic table?approximately 100 elements classified as metals, nonmetals, and compoundsapproximately 100 elements arranged in order of increasing mass. an arrangement of all elements that are metalsan arrangement of approximately 100 elements organized in groups and families30s
- Q2Which electrons in a Bohr model are MOST LIKELY to be involved in chemical reactions?the valence, or inner, electronsany electron shown in the modelelectrons that are closest to the nucleusthe valence, or outer, electrons30s
- Q3Copper, gold, and iron all have some of the same characteristic properties. They are all shiny and conduct electricity. They can be hammered into a shape and drawn into a wire. What classification of elements includes copper, gold, and iron?metalloidgasnonmetalmetal30s
- Q4Atoms are a basic building block of certain types of matter. Atoms make up the elements that combine to form compounds, which make up much of what we use every day. Which of these substances is NOT made out of atoms?humansoxygentreesprotons30s
- Q5Which process represents a chemical change?A lake freezes over into ice.Sand, water, and salt combine to form a mixture.Vinegar bubbles when baking soda is added.A metal bar is rolled into a flat sheet.30s
- Q6Trini adds 10 g of baking soda to 100 g of vinegar. The mixture begins to bubble. When the bubbling stops, Trini finds the mass of the mixture. She determines that the mixture’s mass is 105 g. Why has the mass changed?Mass was destroyed when vinegar reacted with baking sodaBaking soda loses mass when dissolved in vinegar.Vinegar evaporated during the experiment.A gas has formed and left the mixture30s
- Q7Elements in the same group have similar chemical properties. Why do the elements in group 16 share similar chemical properties?These elements’ atoms have the same number of valence electrons.These elements all have the same atomic number.These elements are all nonmetals.These elements are found in the same period.30s
- Q8If you know the atomic number of an element and the element’s position in the periodic table, what can you determine about the element?the atomic number of any element to the left or to the right of the elementthe mass number of any element to the left or right of the elementthe atomic mass of the elementthe number of neutrons in an atom of the element30s
- Q9Which process is an example of a chemical change?bath water cooling while you take a batha glass window breaking when hit with a baseballan iron nail rustinga piece of metal being heated until it expands30s
- Q10A substance contains an arrangement of different types of atoms joined together by chemical bonds. Which of the following classes of substances could this describe?all pure substancesall matterall elementsall compounds30s
- Q11How are the elements on the periodic table arranged?by increasing atomic numberby increasing average atomic massby decreasing atomic numberby decreasing average atomic mass30s
- Q12Solid magnesium, Mg, reacts with oxygen gas, O2, to form the solid magnesium oxide, MgO. Which equation is a balanced chemical equation for this chemical change?Mg + 2O → 2MgOMg + O → MgO2Mg + O2 → 2MgOMg + O2 → MgO230s
- Q13. Atoms of different elements can join together in different arrangements to produce a variety of substances that are found on Earth. There are more than 100 known elements. Which of the following best describes these elements?Most of the elements are metals.Most of these elements are noble gases.Most of these elements are metalloids.Most of these elements are nonmetals.30s
- Q14Which of the following processes transfers the sun’s energy between particles as well as through empty space?convection onlyboth conduction and convectionconduction onlyradiation only30s
- Q15The continent of Antarctica is covered with an ice sheet. Which part of the Earth system includes the ice sheet?geospherehydrospherecryospherebiosphere30s