Which of the following statements is incorrect? a. Isotopes have the same atomic number and different mass numbers. b. Atoms have about the same number of electrons as protons. c. All molecules consist of atoms. d. Free radicals are dangerous because they emit energy
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Which of the following statements is incorrect?
a. Isotopes have the same atomic number and different mass numbers.
b. Atoms have about the same number of electrons as protons.
c. All molecules consist of atoms.
d. Free radicals are dangerous because they emit energy
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- Miller and Urey created a reaction chamber that simulated conditions in Earths early atmosphere to test the hypothesis that______. a. lightning-fueled atmospheric reactions could have produced organic compounds b. meteorites contain organic compounds c. organic compounds form at hydrothermal vents d. oxygen prevents formation of organic compoundsAtoms are incredibly tiny, so small that most microscopes can't even see them, but atoms themselves are made of even smaller particles: protons, neutrons, and electrons. Which of the following describes where protons are located in an atom? A. A shell B. The nucleus C. Both the nucleus and a shellThe smallest particle of an element that still has the chemical characteristics of that element is a(n)a. electron. c. neutron. e. atom.b. molecule. d. proton.
- What atom has only one proton?a. hydrogen d. a free radicalb. an isotope e. a radioisotopec. helium f. oxygenWhich of the following molecules generally possesses a complex shape that allows the molecule to function as tools and machinery that essentially do all the work within a living cell? 20. A. triglycerides B. proteins C. carbohydrate D. A and B are correct.Which of the following statements is not true?a. Water is polar.b. Water stabilizes temperature.c. Water is essential for life.d. Water is the most abundant atom in Earth’s atmosphere.
- Refer to the following figure (first three rows of the periodic table) to answer the questions below. What element does not react with other elements? Group of answer choices A. hydrogen B. helium C. oxygen D. siliconA substance that has weight and occupies space is calleda. kinetic energy.b. a catalyst.c. matter.d. potential energy.Which of the following statements is not true? a. Water is polar. b. Water stabilizes temperature. c. Water is essential for life. d. Water is the most abundant molecule in the Earth’s atmosphere.
- The nucleus of an atom contains: a. neutrons and electrons b. protons and electrons c. protons only d. neutrons and protons e. neutrons onlyIsotopes differ from each other only in the number of electrons they contain. Select one: a. True b. FalseWhich of the following is a representation of a covalently bonded molecule that shows the relative size and position of atoms in three dimensions? A. Structural model B. Structural formula C. Shell model D. Chemical formula