Atomic Theory & Scientists 1. Write the letter of each sentence that is true about Dalton's atomic theory. a. All elements are composed of tiny, indivisible particles called atoms. b. An element is composed of several types of atoms. c. Atoms of different elements can physically mix together, or can chemically combine in simple, whole-number ratios to form compounds. d. Chemical reactions occur when atoms are separated, joined or rearranged; however, atoms of one element are never changed into atoms of another element by a chemical reaction.

Atomic Theory & Scientists 1. Write the letter of each sentence that is true about Dalton's atomic theory. a. All elements are composed of tiny, indivisible particles called atoms. b. An element is composed of several types of atoms. c. Atoms of different elements can physically mix together, or can chemically combine in simple, whole-number ratios to form compounds. d. Chemical reactions occur when atoms are separated, joined or rearranged; however, atoms of one element are never changed into atoms of another element by a chemical reaction.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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2. Which atom has six valence electrons? a. lithium d. neon b. carbon e. boron c. sulfur 3. Which atom has a nucleus that contains 20 protons? a. lithium b. krypton c. carbon 5. Which of the following atoms has the largest radius? a. lithium b. lead c. cesium d. fluorine UNIT 1 a. helium b.xenon d. calcium e. potassium e. carbon 6. Which of the following atoms has the highest first ionization energy? c. potassium d. hydrogen e. carbon
Which of John Dalton’s theories given below were found to be INCORRECT?1. the atoms of elements remain unchanged when they combine to form chemical compounds2. the atom is the smallest unit of matter that retains its chemical identity3. all atoms of the same element are identical4. the atom cannot be divided into any smaller unit of massA) 2 and 3 D) 1, 2, and 3B) 3 and 4 E) all four were found to be correct C) 1,3,and4
6. Who discovered the nucleus of the atom? A. Dalton B. Rutherford C. Millikan D. Thomson 7. The five spheres below represent Se, Se2-, O, H, and S, not necessarily in that order. 37 pm 72 pm 100 pm 114 pm 196 pm Which answer correctly orders all five species from smallest to largest? A. O х"(g) + e B. X*(g) → X*(aq) С. Х(g) + e -> X (з) D. X*(g) + e→ X(g) 9. Which of the following compounds are insoluble? A. Pbl2 В. CaSO4 С. CSCI D. Nazs E. Both A and B 10. Assign oxidation numbers to the chlorine atom in each of the following compounds: Cl2, HCI, ClO3, CIF3, PCI3 А. О, —1, +6, +3, -1 В. О, —1, +5, +3, -3 С. 0, —1, +5, +3, —1 D. 0, -1, +3, +3, –1
Which pair of elements do you expect to be the most similar? a. Molybdenum and Tin b. Nitrogen and Nickel c. Silicon and Phosporous d. Sodium and Magnesium e. Chorine and Fluorine
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There are two significant isotopes of chlorine. Their natural abbundances are: Isotope Atomic Mass Natural abundance 35CI 34.969 amu 75.78% 37CI 36.966 amu 24.22% According to these data, what is the average atomic mass of chlorine? Select one: a. 35.968 amu b. 35.543 amu C. 71.935 amu d. 35.54 amu e. 35.97 amu
I don't know.. both are...
Periodic Table 15. Write the letter of each statement that is true about the average atomic mass of an element and the relative abundance of its isotopes. a. In nature, most elements occur as a mixture of two or more isotopes. b. Isotopes of an element do not have a specific natural percent abundance. c. The average atomic mass of an element is usually closest to that of the isotope with the natural highest abundance. d. Because hydrogen has three isotopes with atomic masses of about 1 amu, 2 amu and 3 amu, respectively, the average atomic mass of natural is 2 amu.
Which of the following statements are true of chemical reactions? a. The number and types of atoms are the same in the products and the reactants. b. Different isotopes of the same element behave similarly. c. New elements are often formed. d. Only the valence electrons are involved.
2. Which element forms an ion that is larger than its atom? B. Iron A. Sodium ton 11: C. Nitrogen genera C. remains the sam D. Gold
32. An atom contains 27 neutrons and 23 electrons. What element is this atom?
Which part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube experiments? A:Atoms can form new substances. B:Atoms are small. C:Atoms are indivisible. D:Atoms can join together.