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- 1-78 The kinetic energy possessed by an object with a mass of 1 g moving with a velocity of 1 cm/s is called 1 erg. What is the kinetic energy, in ergs, of an athlete with a mass of 127 lb running at a velocity of 14.7 mi/h?1-61 The density of dichloromethane, a liquid insoluble in water, is 1.33 g/cc. If dichioromethane and water are placed in a separatory funnel, which will be the upper layer?What is the boiling point of the unknown substance Xin K(Kelvin)? X(t) = X(g) AH-(kJ mol1) S°J mol1K1) X(g) -82.0 238 | X({) | -101 144 Express your answer in decimal notation rounded to three significant figures.
- Ecell Mg2+(aq) + 2 e- -> Mg(s) Mg2 + |Mg = - 2.372 Sn4+(aq) + 2 e- -> Sn2+(aq) Sn2 + , Sn4 + |Pt = + 0.154 Cl2 (g) + 2 e- -> 2 Cl-(aq Cl-| Cl2 |Pt = +1.36 Which of the following is best reducing agent for Cl2(g)? a. Mg(s) b. Mg2+(aq c. Sn4+(aq) d. Sn2+(aq548.8 + 0.2 x 55.4±0.6 (1142.9 ± 0.6 – 171.0±0.5) ANS: Absolute uncertainty: Percent uncertainty:Multiply both sides of the equation by the same expression: (Be sure that the answer field changes from light yellow to dark yellow before releasing your answer.) 1 1 *(-A) [A] [A]o Drag and drop your selection from the following list to complete the answer: -t 1 t = t 1 t x kt
- 1 1 J 1 MJ 1 m J Edlanation = 10 = 10 = 10 = 10 Check -1 3 J J J J by filling in the missing prefix μ X14.3462 +2.55 Express your answer in appropriate significant figures. — ΑΣΦ ftermitte ΠΡΕΠΕΙ ΝAssuming that you weighted a piece of silver five times and each time you got 52 grams. However, the actual weight from the Bureau of Standards said it should weigh 50 g. (a) What is the % relative errors? (b) What type of error does this exemplify? (c) Does this affect (a) reliability (b) Accuracy (c) both a & b
- Calculate the electrostatic force of repulsion for two protons separated by 93.0 pm. The charge of a proton is q = 1.6 x 10-1⁹ C. Express your answer to two significant figures and include the appropriate units. Fel = μA 2.7.10 6 Submit N Previous Answers Request Answer ? X Incorrect; Try Again; 5 attempts remaining Use the equation Fel = K(Q₁ Q₂/d²) to find the electrostatic force between the two particles. Q₁ and Q2 are the charges on the particles (charge of a proton here), and d is the distance of separation. The constant is given in the introduction and has the units Nm²/C². This means that the distance must be converted from picometers to meters using the relation 1 pm = 1 × 10¯ m. -12What is the error in the answer to the following? a) (22.10 ± 0.01) + (37.51 ± 0.02) = b) (30.88 ± 0.03) - (31.57 ± 0.06) = c) (5.88 ± 0.05) × (2.17 ± 0.01) =What is the median of the values 6.12, 7.00, 7.59, 4.11, 5.00, 5.02, and 9.56?