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vova2212 [387]
3 years ago
6

How can a prairie dog cause physical weathering

Chemistry
2 answers:
olga nikolaevna [1]3 years ago
6 0
A prairie dog can cause physical weathering by digging burrows.

Radda [10]3 years ago
5 0
• Animals such as prairie dogs, can cause physical weathering by digging burrows.
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Problem page a virus has a mass of ×9.010−12mg and an oil tanker has a mass of ×3.0107kg . use this information to answer the qu
faltersainse [42]
A. The mass of one mole of the virus is calculated by multiplying the mass of a single virus by the Avogadro's number which is equal to 6.022 x 10^23. Performing this operation,

   mass = (9.0 x 10^-12 mg)(6.022 x 10^23) = 5.42 x 10^12 mg

In correct number of significant figures, the answer would only have to be 5.4 x 10^12 mg. 

b. The number of moles of the virus that will have the same mass as the oil tanker is calculated by dividing the mass of the oil tanker by the mass of one mole of the virus. Note that doing division, both would have to have the same units. 

       n = (3.0 x 10^7 kg) / (5.4 x 10^12 mg)(1 g/1000 mg)(1 kg/1000 g)

Simplifying,
               n = 6

In correct number of significant figures, the answer is 6.0. 
4 0
3 years ago
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snow_tiger [21]

Answer:

the 2nd one

Explanation:

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Question 7
Svet_ta [14]

Answer:

Check if the ions of two compounds exchange places.

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The definition of single replacement is a reaction when an ion replaces another ion, thus the name.

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How many grams are 1.20 x 1025 molecules of calcium iodide?
jeka57 [31]

Answer:

1230

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1.20×1025=1230 is your answer

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How many Valence electrons does Li have?
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It has a single valence electron.

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