Unit 3 Quiz 1 Remediation
Quiz by Ashley Brady
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20 questions
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- Q1Which scientist described a positively charged core ('nucleus") in the middle of a lot of empty space?ThomsonChadwickRutherfordBohr30s
- Q2A scientist uses a radiation source to bombard a sample atom with positively charged ions. Observations show that MOST of the positive ions pass through the atom while SOME of the positive ions are deflected. Why is model B a more accurate representation of the atom than model A?Model B shows an atom filled with positive and negative charges which repel most of the positive ions.Model B shows an atom with a negative center that allows most of the positive ions through.Model B shows an atom that is mostly empty space and has a positive center.Model B shows an atom with a negative center which repels most of the positive ions.30s
- Q3Look at the chart, which two atoms are isotopes of one another?Atoms 1 & 2Atoms 1 & 4Atoms 1 & 3Atoms 2 & 330s
- Q4Look at the chart, which two atoms have the same mass?Atoms 1 & 4Atoms 2 & 3Atoms 2 & 4Atoms 1 & 230s
- Q5According to the modern concept of the atom, which subatomic particles are located in the nucleus of an atom?neutrons and protonsprotons onlyprotons and electronsneutrons and electrons30s
- Q6Which subatomic particle(s) have a mass of 1 amu?protonproton and neutronproton and electronelectron30s
- Q7An element has two isotopes. One isotope has a relative abundance of 75.0% and mass 25.0 amu. The second isotope has a relative abundance of 25.0% and 28.0 amu. What do you predict is the average atomic mass of the element?27.326.525.825830s
- Q8The element gallium (Ga) has two naturally occurring isotopes Ga-69 and Ga-71. The average atomic mass of gallium listed on the periodic table is 69.723 amu. Which naturally occurring isotope Ga-69 or Ga-71 is most abundant?Ga-71 because it has more neutrons resulting in more distance between the protonsGa-71 because it has a greater massGa-69 because the average atomic mass of the element is closer to its massGa-69 because it has fewer neutrons30s
- Q9What is the correct isotope notation for an atom that has 23 protons and 29 neutrons?Copper-52Vanadium-29Vanadium-52Carbon-2930s
- Q10If an atom has 35 AMU mass number and 18 neutrons, what is the identity of the atom?ClCuNaP30s
- Q11A student is researching atomic bombs and uranium isotopes appear several times in the article. The student does not understand isotopes. Which explanation below would best fit your claim to clarify the students understanding?Isotopes of uranium are the same element because they have the same number of protons which makes them the same element.Isotopes of uranium are the same element because they are unique in that they do not follow the definition of an isotope.Isotopes of uranium are not the same element but are in the same family as the main element uranium.Isotopes of uranium are not the same element because but have the same number of electrons, therefore electrons do not change in isotopes even when forming positive and negative ions.30s
- Q12Students are given the following data for determining the average atomic mass of lithium. A sample of lithium consists of 400 atoms. 30 atoms are the isotope Lithium-6 (6.015 amu) and 370 are Lithium-7 (7.016 amu). Which student correctly calculated the correct average atomic mass and why?Student 1 calculated the average atomic mass as 6.94 amu. Student 1 determined the percent abundance for each isotope and then multiplied the percent abundance by the average atomic mass of its isotope and took the sum.Student 4 calculated the average mass as 13.0 amu. Student 4 added the mass of the two isotopes.Student 3 calculated the average atomic mass as 1.06 amu. Student 3 took the sum of the average atomic masses of the isotopes and multiplied by the ratio of lithium-6 to lithium-7.Student 2 calculated the average atomic mass as 6.52 amu. Student 2 took the average of the mass of the two isotopes of lithium.30s
- Q13A scientist is monitoring the levels of strontium-90 in her company’s dairy products. What observation will allow her to conclude that the level of strontium-90 is above the naturally-occurring level? The average atomic mass of naturally-occurring strontium-90 is 87.62 amu.The average atomic mass of the strontium atoms in the sample is 87.62 amu.The average atomic mass of the strontium atoms in the sample is above 87.62 amu.The average atomic mass of the strontium atoms in the sample is below 87.62 amu.More data on the relative abundance of each strontium isotope is required.30s
- Q14A sample of phosphorus was isolated and analyzed to determine the percent abundance of each isotope. The results are recorded in the table. Based on the data, which statement gives the best reasoning for the average atomic mass for the isotopes is 31.14 amu?It is an integer numberIt is the weighted average mass of all the different isotopes found in a sample of phosphorusIt is the total number of neutrons and electrons in the isotopes found in a sample of phosphorusIt is the total number of neutrons, protons, and electrons in the isotopes found in a sample of phosphorus30s
- Q15Which of the following has a negative charge?NucleusProtonElectronNeutron30s
