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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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What reacts in a chemical reaction to form a new substance with different products
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Answer:

Atoms

Explanation:

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Which of the following compounds will not produce O2 gas when it decomposes? (2 points)
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LiOH is the right answer.
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Ionic compounds are normally in which physical state at room temperature?
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<span>Ionic compounds are normally in which physical state at room temperature in solid. The answer is A. 

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3 years ago
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What is the pH of a mixture of 0.042 M NaH2PO4 and 0.058 M Na2HPO4? Hint: The pKa of phosphate is 6.86.
AlekseyPX

Answer:

The pH value of the mixture will be 7.00

Explanation:

Mono and disodium hydrogen phosphate mixture act as a buffer to maintain pH value around 7. Henderson–Hasselbalch equation is used to determine the pH value of a buffer mixture, which is mathematically expressed as,

pH=pK_{a} + log(\frac{[Base]}{[Acid]})

According to the given conditions, the equation will become as follow

pH=pK_{a} + log(\frac{[Na_{2}HPO_{4} ]}{[NaH_{2}PO_{4}]})

The base and acid are assigned by observing the pKa values of both the compounds; smaller value means more acidic. NaH₂PO₄ has a pKa value of 6.86, while Na₂HPO₄ has a pKa value of 12.32 (not given, but it's a constant). Another more easy way is to the count the acidic hydrogen in the molecular formula; the compound with more acidic hydrogens will be assigned acidic and vice versa.

Placing all the given data we obtain,

pH=6.86 + log(\frac{0.058}{0.042})

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3 years ago
I WILL GIVE 15 POINTS PLS I NEED THIS BEFORE THE CLASS FINISHES IN 30 MINN
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likely be the same

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