4. The volume of a gas is 27.5 mL at 22^circ C and 0.974 atm. What will the volume be at 15.0^circ C and 0.993 atm? (Hint: Remember to convert temperature to Kelvin using the equation T_((K))=T_((^circ C))+273)
19) Which of the following is a chemical change? A) wood burning in a fireplace B) ice melting to water C) chopping wood for a fire D) sewing a button on a shirt E) pouring water into a glass
v Details View Submission Listen Complete the sentences. Use the drop-down arrows to choose the correct answers. Atoms achieve stability by having electrons fill their square electron shell. This involves reaching a total of square electrons for most elements. middle outer
Question Choose the option below that exemplifies homogeneous equilibria. Select the correct answer below: N_(2)(g)+3H_(2)(g)leftharpoons 2NH_(3)(g) CaCO_(3)(s)leftharpoons CO_(2)(g)+CaO(s) P_(4)(s)+6Cl_(2)(g)leftharpoons 4PCl_(3)(l) H_(2)O(l)leftharpoons H_(2)O(g)
Write the equilibrium constant expression for K_(c) for the following process. 2CO_(2)(g)leftharpoons 2CO(g)+O_(2)(g) K_(c)= square
There are 7.16 mol C and 139 mol H in the sample. Divide by Smallest: Which substance should you divide by? hydrogen carbon don't need to divide
The quantitative proportion of reactants to products in a chemical reaction is known as __ the Law of Conservation of Mass stoichiometry the precipitation coefficient
What is the freezing point, in {}^circ C of a 0.41 m solution of C_(5)H_(4) in benzene? FP_((benzene))=5.50^circ C i=1 K_(f(benzene))=5.12^circ C/m Delta T_(f)=(i)(K_(f))(m) [?]cdot ^circ C
How many moles of HNO_(3) are present in 697 g of HNO_(3) 32 moles 8.4 moles 7.1 moles 14 moles
Determine the amount of heat (in kJ) associated with the production of 1.32times 10^4g of NO_(2) according to the following equation: 2NO(g)+O_(2)(g)arrow 2NO_(2)(g) Delta H=-114.6(kJ)/(mol) Be sure your answer has the correct number of significant digits. square kJ
22. When sugar is mixed with water equilibrium is reached when molecules of sugar stop moving the dissolved sugar molecules are evenly distributed throughout the
For which of the properties would aluminum have a greater value than gallium? 1. Atomic radius 2. Ionic radius 3. Electronegativity 4. Ionization energy
1A. Which of the following is most likely a significant cause of the general trend indicated by the graph? A. Reduction of ozone concentration in the upper atmosphere B. Reduction in size of polar ice caps C. Increase in energy output of the sun D. Increase in evaporation of ocean water E. Increase in consumption of fossil fuels 1B. Based on the results of the graph, which oceanic changes will be observed? A. pH will decrease, but the ocean will remain basic B. pH will increase and the ocean will become more basic C. pH will decrease and the ocean will become acidic D. pH will not significantly change 2A. When "strong," these dissociate completely in solution. A. Acid B. Base C. Both 2B. Is a proton-donor when dissolved in solution. A. Acid B. Base C. Both 2C. A solution with a pH greater than 7, up to 14. A. Acid B. Base C. Both 2D. A solution that contains more hydronium ions $(H3O+)$ than hydroxide ions $(OH-).$ A. Acid B. Base C. Both
Question 7 Match the definition with the correct term about the atom in relation to the periodic table. number of protons in the nucleus of an $\square $ atom [Choose] [Choose] total number of protons and neutrons in mass number the nucleus of an atom atomic mass atomic number $\square $ weighted, average mass of all isotopes of a naturally occurring element 1 pts
Properly identify the following ions (some answers will be used twice and some answers will not be used at all) magnesium $\square $ phosphate $\square $ ammonium $\square $ chloride $\square $ iron (III) $\square $ perchlorate $\square $
have gone into the field to take water samples from lakes in your town. note the following observations: Lake A contained many fish swimming in its waters. Lake B had very few fish swimming in its waters, and a few dead fish floating on the water. u return to your lab and take pH readings for each mple. Think about how acids and bases would affect the water quality in the two lakes. Which set of pH data would you expect to see based on your observations? Lake A: $pH=4.5$ Lake B: $pH=7.5$ Lake A: $pH=8.3$ Lake B: $pH=3.7$ Lake A: $pH=6.6$ Lake B: $pH=6.8$ Lake A: $pH=10.2$ Lake B: $pH=1.7$
A buffer consists of a weak acid and its conjugate hase in the same solution. Match the weak acid-conjugate base pairs that could be used to make a buffer. (Carvat does not show subscripts HCOOH $\square $ [Choose] $HC2H3O2$ $\square $ : HCN [Choose] H2O $NaCOOH$ $NaC2H3O2$ $NaOH$ $HCl$ $HaCN$ Question 9 aspts
${}_{2}^{4}He$ How many protons does He have? a b b C 2 d 6
Student B: At the beginning of the reaction the rate of the forward reaction was higher than the rate of the reverse reaction: ammonia and water were turning into ammonium hydroxide. But now, the rate of the reverse reaction is higher. Which student has the most accurate answer? Choose 1 answer: A Student A B Student B C Both students' answers are correct.
The number of atoms in a mole of something remains the same, but the mass of a mole depends on how many atoms you have the average atomic mass of the elements
