Which one of the following molecules has tetrahedral geometry? A. CF4 B. XeF4 C. BF3 D. NH3 E. AsF5 63. A molecule with 3 single bonds and 0 lone pairs of electrons is predicted to have which type of molecular geometry? A. Trigonal planar B. Trigonal pyramidal C. Bent D. Trigonal bipyramidal E. Linear 64. A central atom with 4 electron pairs (single bonds and/or lone pairs of electrons) could have which of the following molecular geometries?
(1 point for each molecule) The central atom is C. 2. How many atoms are bonded to the central atom? (1 point for each molecule) There are two atoms bonded to the central atom. 3. How many lone pairs of electrons are on the central atom?
Chemistry chapter 6.3 1) a. Cation b. Electrostatic forces 2) Ionic bond between metal and oxygen, the metals conduct electricity in a solid state using delocalised electrons. They are coated with a special kind of plastic e.g. Copper. 3) When they contain 8 valance electrons. 4) When naming an ionic compound, which ion is given first?
1.23 C. 5.74 X 10-4 D. 0.658 _____ 14. Which of the following is true for the following voltaic cell? Zn (s) ( Zn2+(aq) (( Cr3+ (aq) ( Cr (s) A. The electrons flow from cathode to the anode. B.
COMPOSITION OF POLLUTION - FREE GROUND LEVEL AIR Nitrogen 78.08% Oxygen 20.95% Carbon Dioxide 0.03% COMPOSITION OF UNIVERSE COMPOSITION OF EARTH Hydrogen 60.40% Iron 35.4% Helium 36.56% Oxygen 27.8% Oxygen 0.96% Magnesium 17.0% Carbon 0.30% Silicon 12.6% ELEMENTS 90 Naturally occurring 19 Synthesized 109 TOTAL ATOM Chapter 3 What is it? Def: The smallest particle still having the characteristics of an element. It is made up of smaller particles: electrons, protons, and neutrons. Simplest atom is H (hydrogen). electron
In this mixture, there are no enzymes present and therefore no products are formed. The reaction rate was rated 0, just as we anticipated. 2. The 2nd experiment was a mixture of 2 mL H2O2 and 0.1g Manganese dioxide. We can use the same principal we used for the first experiment, Manganese dioxide is not a protein, not an enzyme, it is a catalyst.
Under the assumption that current and voltage are both sinusoidal functions of time (t, in seconds) and both have the same frequency of 60 cycles per second (period=1/60), let C be the current in Amperes (Amps) with a maximum current of 5 Amps at zero seconds (t=zero). Let V be the voltage that is “leading” the current (‘leading’ corresponding to a negative phase shift) by .003 seconds, meaning voltage reaches its maximum of 180 volts .003 sec before the current reaches its maximum. Both functions begin at zero- there are no phase shifts. Question 1, Part A. Current as a function of time: Based upon the given information, we will be determining the Amplitude (A), period (and thus, B), and the phase shift (C).
Consider the hypothesis test given by 5.0: 5 .0: 10 pH p H In a random sample of 100 subjects, the sample proportion is found to be . 55.0ˆ p (a) Determine the test statistic. Show all work; writing the correct test statistic, without supporting work, will receive no
b. external dissolved ion concentrations. c. movement of water down its concentration gradient. d. movement of water up its concentration gradient. e. none of the choices apply. 9.
HSC Chemistry Assessment task 1 Nuclear Chemistry Research report 1. Distinguish between stable and radioactive isotopes and describe the conditions which a nucleus is unstable. To understand if an element is stable we first must understand what stability is. The stability of the nucleus is directly related to the strength of the forces that hold the nuclear particles together. These protons and neutrons of the nucleus are called nucleons.