Chemistry STAAR Review
Quiz by Kylie Middleton
Grade 8
Science (2010) (Archived)
Texas Essential Knowledge and Skills (TEKS)
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28 questions
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- Q1A student mixes two clear liquids. After a few minutes, a white powder can be seen settling at the bottom of the test tube. From these observations the student can conclude that the two clear liquids–have been converted to the gaseous state.have been stored too long and are no longer good.were pure substances before they were mixed.have combined to form a new substance.30s8.5.E: Matter and Energy
- Q2This table shows the chemical formulas for three substances that contain some of the following elements: hydrogen (H), chlorine (Cl), carbon (C), calcium (Ca), and oxygen (O). Which conclusion is supported by the information in the table?Substance Y has more carbon atoms than substance Z.Substance X has fewer atoms of hydrogen than substance Y.Substance Z has fewer calcium atoms than substance X.Substance X has more atoms of chlorine than substance Y.30s8.5.D: Matter and Energy
- Q3Which of the following would indicate a new substance has been formed?Powder dissolves in water.A solid becomes a liquid.Bubbling and fizzing occur.A puddle of water evaporates.30s8.5.E: Matter and Energy
- Q4The table lists the characteristics of four materials. Which sample is most likely classified as a metal?Sample IVSample IIISample IISample I30s
- Q5Based on the numbers of subatomic particles, which of the following atoms will have a positive charge?Protons = 6, neutrons = 6, electrons = 6Protons = 9, neutrons =10, electrons = 9Protons =10, neutrons =11, electrons =11Protons = 7, neutrons = 6, electrons = 630s8.5.A: Matter and Energy
- Q6An atom of an element has 12 protons. How many electrons does the atom have if it has a charge of positive 2 (+2)?241021430s8.5.A: Matter and Energy
- Q7Which of the following is a property of nonmetals?Shiny lusterVery malleableHigh densityLow conductivity30s
- Q8A chart with the densities of four metals is shown. Students were given a sample of an unknown metal and told to determine its density. They measured its mass as 26.4 g and its volume as 3.0cm3. Use the chart to determine which metal the students were given.NickelTitaniumZincSilver30s
- Q9How many different elements are in 2NaCHONaC542330s8.5.D: Matter and Energy
- Q1030s8.5.D: Matter and Energy
- Q11An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom’s nucleus?0+25-25-3030s8.5.A: Matter and Energy
- Q12The diagram shows an atom. How many protons are in the atom?12115430s8.5.B: Matter and Energy
- Q13A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. To remove the tarnish from the ring, students placed it in a pan lined with aluminum foil and added hot water. Baking soda was added to the hot water and stirred. Students made observations about the process. Which observation of this process provides evidence of a chemical reaction?The pan was lined with aluminum foil.The hot water cooled.Hot water heated the aluminum foil.The liquid solution changed color.30s8.5.E: Matter and Energy
- Q14What is the total number of protons, neutrons, and electrons in a cadmium, Cd, atom that has a mass number of 112?649611216030s8.5.A: Matter and Energy
- Q15Which is NOT the correct formula to determine the number of neutrons in an atom?Atomic Mass - ElectronsAtomic Mass - ProtonsProtons - ElectronsAtomic Mass - Atomic Number30s8.5.A: Matter and Energy
