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MrMuchimi
3 years ago
12

The animal kingdom is large and diverse. Scientists discover new species all the time, and they need a way to classify them. The

science of classification is called taxonomy. In taxonomy, every kingdom of life (plant, animal, fungus, etc) branches into smaller groups called phyla. Each phylum branches into classes, and so on down to species. The presence or absence of a backbone is one of the first traits that scientists use to classify animals. Animals without a backbone are invertebrates. There are many phyla of invertebrates. Earthworms, spiders, jellyfish, starfish and butterflies are all examples of invertebrate animals. Animals with a backbone are vertebrates.
Which of these is an example of an invertebrate?

A
an oak tree, which is a kind of plant
B
a mushroom, which is a kind of fungus
C
a bat, which is an animal with a backbone
D
a snail, which is an animal without a backbone
Chemistry
1 answer:
tatiyna3 years ago
4 0

The answer is D, because "Animals without a backbone are invertebrates."

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An aqueous solution is listed as being 33.8% solute by mass with a density of 1.15 g/mL, the molar mass of the solute is 145.6 g
vodomira [7]

Answer:

A) 2.69 M

B) 0.059

Explanation:

A) We have:

33.8% solute by mass= 33.8 g solute/100 g solution

molarity = mol solute/ 1 L solution

molarity= \frac{33.8 g solute}{100 g solution} x \frac{1.15 g solution}{1 ml} x \frac{1 mol solute}{145.6 g solute} x \frac{1000 ml}{1 L}

molarity= 2.69 mol solute/L solution = 2.69 M

B) We know that there are 33.8 g of solute in 100 g of solution.

As the total solution is compounded by solute+solvent (in this case, solvent is water), the mass of water is the difference between the mass of the total solution and the mass of solute:

mass of water= 100 g - 33.8 g = 66.2 g

Now, we calculate the number of mol of both solute and water:

mol solute= 33.8 g solute x \frac{1 mol solute}{145.6 g} = 0.232 mol

mol H20= 66.2 g H₂O x \frac{1 mol H2O}{18 g}

Finally, the mol fraction of solute (Xsolute) is calculated as follows:

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When magnesium reacts with hydrochloric acid, hydrogen gas is formed: 2HCl + Mg → H2 + MgCl2. What is the volume of hydrogen pro
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2HCl+Mg\rightarrow H_2+MgCl_2

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R = 0.0821\frac{atm.L}{mol.K}

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1(V) = (0.672)(0.0821)(298)

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