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3 years ago

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Chemistry

2 answers:

aalyn [17]3 years ago

8 0

All the reactants listed in the Table of Oxidation Potentials are reducing agents and oxidized by the reaction.

vaieri [72.5K]3 years ago

6 0

Answer:
Reducing agents
Oxidized by the reaction

Sorry for late response on the answer.

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Which of the following does NOT indicate that a chemical change may have taken place?

labwork [276]

The following does NOT indicate that a chemical change may have taken place is fracture formation. A chemical change happens when the substance changes its physical state and composition resulting from a chemical reaction. This chemical reaction may either give off or absorb energy. A change in color is a chemical change. For example, litmus paper turns to red when placed in an acid solution. Production of gas is a chemical change. For example, adding hydrochloric acid to the tiles of the bathroom gives a hissing sound with gases given off. Formation of a precipitate is also a chemical change. Change in shape is not a chemical change.

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3 years ago

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A 4.7g sample of ethanol is burned in a calorimeter containing 95.8 mL of water. If the initial temperature of the water is 29.1

Anna11 [10]

Answer:

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Feel it when you're close to me

And out of reach

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We got la la la, lots of good vibrations

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You and me got, you and me got

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3 years ago

Which of these best explains why a paper clip can float on water?

Tems11 [23]

The water has surface tension

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3 years ago

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What is the half-life of a pharmaceutical if the initial dose is 500 mg and only 31 mg remains after 6 hours?

Sergeu [11.5K]

Answer:

$\large \boxed{\text{b. 1.5 h}}$

Explanation:

1. Calculate the rate constant

The integrated rate law for first order decay is

$\ln \left (\dfrac{A_{0}}{A_{t}}\right ) = kt$

where

A₀ and A_t are the amounts at t = 0 and t

k is the rate constant

$\begin{array}{rcl}\ln \left (\dfrac{500}{31}\right) & = & k \times 6\\\\\ln 16.1 & = & 6k\\2.78& =& 6k\\k & = & \dfrac{2.78}{6}\\\\& = & 0.463 \text{ h}^{-1}\\\end{array}$

2. Calculate the half-life

$t_{\frac{1}{2}} = \dfrac{\ln2}{k} = \dfrac{\ln2}{\text{0.463 h}^{-1}} = \textbf{1.5 h}\\\\ \text{The half-life is $\large \boxed{\textbf{1.5 h}}$}$

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3 years ago

When two liquids are combined and form a solid (but didn't freeze) the solid that was formed is called

ludmilkaskok [199]

The answer is nucleation because can turn liquids into solids.

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