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Chapter 1: Q95AE (page 1)

When jump-starting a car with a dead battery, the ground jumper should be attached to a remote part of the engine block. Why?

Short Answer

Expert verified

It minimizes the risk of attracting a hazard by igniting the H₂O and O₂ near the car.

Step by step solution

01

Explaining why ground jumper is attached to engine block

The gas when being jump-started releases hydrogen gas. This gas can ignite sparking which can attract a hazard.

02

Highlighting what is to be done to avoid this hazard

Attach the ground jumper withan unpainted bolt or bracket. The bolt or bracket should be far from the dead battery. Doing this reduces the possibility of igniting hydrogen gas.

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Most popular questions from this chapter

All amino acids have at least two functional groups with acidic or basic properties. In alanine the carboxylic acid group has $K_{a} {= 4.5×10}^{- 3}$ and the amino group has $K_{b} {= 7.4×10}^{- 5}$ . Three ions of alanine are possible when alanine is dissolved in water. Which of these ions would predominate in a solution with $[H^{+}] = 1.0M$ in a solution with $[{OH}^{-}] = 1.0M$ ?

What mass of each of the following substances can be produced in 1.0 h with a current of 15 A?
a. Co from aqueous Co²⁺
b. Hf from aqueous Hf⁴⁺

c. I₂ from aqueous KI

d. Cr from molten CrO³

Question:Indium oxide contains 4.784 g of indium for every 1.000 g of oxygen. In 1869, when Mendeleevfirst presented his version of the periodic table, he proposed the formula In₂O₃ for indium oxide.Before that time, it was thought that the formula was InO. What values for the atomic mass ofindium are obtained using these two formulas? Assume that oxygen has an atomic mass of16.00.

Tris(hydroxymethyl) aminomethane, commonly called TRIS or Trizma, is often used as a buffer in biochemical studies. Its buffering range is from pH 7 to 9, and $K_{b}$ is $1.19 \times 10^{- 6}$ for the reaction

localid="1664876042279" $\begin{array}{l} C N H_{2} (a q) + H_{2} O (l) ⇌ C N {H_{3}}^{+} (a q) + O H^{-} (a q) \\ T R I S T R I S H^{+} \end{array}$

a.What is the optimum pH for TRIS buffers?

b.Calculate the ratio $[T R I S] / [T R I S H^{+}]$ at $p H = 7.00$ and at $p H = 9.00$ .

c.A buffer is prepared by diluting 50.0 g of TRIS base and 65.0 g of TRIS hydrochloride to a total volume of 2.0 L. What is the pH of this buffer? What is the pH after 0.50 mL of 12 M HCl is added to a 200.0 mL portion of the buffer?

The following mechanism has been proposed to account for the rate law of the decomposition of ozone to $O_{2}$ (g):

$O_{3} + M ⟷_{K_{- 1}}^{K_{1}} O_{2} + O + M O + O_{3} \overset{K_{2}}{\to} 2 O_{2}$

Apply the steady-state hypothesis to the concentration of atomic oxygen, and derive the rate law for the decomposition of ozone. ( $M$ stands for an atom or molecule that can exchange kinetic energy with the particles undergoing the chemical reaction) .

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