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e-lub [12.9K]
3 years ago
6

2. Is it true thatOnly the stratosphere contains enough air for living things to breathe?

Chemistry
1 answer:
xenn [34]3 years ago
4 0

Answer:

I'm pretty sure that's false.

Explanation:

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How many alkali metals will combine with 1 oxygen family member
Daniel [21]
The alkali metals are so reactive that they are never found in nature in elemental form. Although some of their ores are abundant, isolating them from their ores is somewhat difficult. For these reasons, the group 1 elements were unknown until the early 19th century, when Sir Humphry Davy first prepared sodium (Na) and potassium (K) by passing an electric current through molten alkalis. (The ashes produced by the combustion of wood are largely composed of potassium and sodium carbonate.) Lithium (Li) was discovered 10 years later when the Swedish chemist Johan Arfwedson was studying the composition of a new Brazilian mineral. Cesium (Cs) and rubidium (Rb) were not discovered until the 1860s, when Robert Bunsen conducted a systematic search for new elements. Known to chemistry students as the inventor of the Bunsen burner, Bunsen’s spectroscopic studies of ores showed sky blue and deep red emission lines that he attributed to two new elements, Cs and Rb, respectively. Francium (Fr) is found in only trace amounts in nature, so our knowledge of its chemistry is limited. All the isotopes of Fr have very short half-lives, in contrast to the other elements in group 1.
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3 years ago
Which form of energy is directly related to the measure of the average kinetic energy of the particles in a substance?
timama [110]

Answer:

thermal energy

Explanation:

4 0
3 years ago
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Which of these is an example of a physical change?
Goryan [66]
Is it a multiple choice?
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3 years ago
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please help!!!!!! What is the mass of 1 mole of magnesium (Mg)? Express your answer to four significant figures. The mass of 1 m
Semmy [17]
I believe you just look at your periodic table for this value. I don't think there is any math involved.
Therefore one mole of Mg = 24.305g.
5 0
3 years ago
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Labels of many food products have expiration dates, at which point they are typically removed from the supermarket shelves. A pa
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Answer:

Explanation:

Since it first order, we use order rate equation

In ( \frac{A1}{A0}) = -kt where A1 is the final quality = 0.8 (80%), A0 is the initial quality = 1 ( 100%)

also, t half life = \frac{In2}{k} where k is rate constant

k = \frac{In 2}{45 days} = 0.0154

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6 0
3 years ago
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