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qaws [65]
3 years ago
5

Select all of the statements that are true.

Chemistry
2 answers:
Ahat [919]3 years ago
5 0
1 is true, 
<span>2 is definitely false </span>
<span>3 is also completely false because </span>
<span>4 is true. </span>

<span>So 1&4 </span>
sveta [45]3 years ago
3 0

According to the atomic model given by Rutherford, the atom is a dense, and tiny positively charged core known as the nucleus, which is enveloped by lighter and negatively charged electrons. An electron refers to a stable subatomic particle comprising a negative charge, which is found in all the atoms.  

The following are the correct statements:  

1. The electrons are situated in orbits or shells around the atom.  

2. The electrons are traveling so fast, that it becomes almost impossible to locate their precise locations.  

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The average American is looking at their phone for 6.25 hours a day. How many hours will the average American spend on their pho
julia-pushkina [17]

Answer:

177253.125hrs

Explanation:

Given parameters:

  Number of hours spend per day on phone  = 6.25hrs

 Unknown:

Average hours pend by an average American if they lived for 77.7yrs

Solution:

Let us find the number of hours an average American spends on their phone per year;

    there are 365days in a year

 Number of hours  = 365 x 6.25  = 2,281.25hrs

Now, if they lived for 77.7yrs;

  They will spend  = 77.7 x 2,281.25 = 177253.125hrs

8 0
2 years ago
Phenolphthalein indicator was added, and the solution in the flask was titrated with 0.215M NaOH until the indicator just turned
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In titration, the moles of acid equal moles of base. You were given that 22.75ml of 0.215M NaOH is used, so calculate the number of moles of that base the experiment used in total. After that because you know mol base = mol acid, whatever amount of base you use must be the total amount of acid present in the solution. You were given the volume of the acid, and you have just found the total mols of acid. Using these two information, solve for the concentration. And one more thing, even though I'm pretty sure it won't affect your answer, you should always convert things to the proper units. Since the concentration we're talking about in this problem is molarity, which has the unit mol/L, you should always have all of your numbers in these units. It just make it simpler and will not confuse you
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3 years ago
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1. If you have 25% radioactive parent atoms in a mineral crystal, and 75% daughter atoms, how many half-lives have passed?
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Too freaking many... or maybe not many at all

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3 years ago
What is the empirical formula for ribose?
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Answer:

The empirical formula of ribose (a sugar) is CH2O. In a separate experiment, using a mass spectrometer, the molar mass of ribose was determined to be 150 g/mol.Explanation:

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More pollutants accumulate
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