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guajiro [1.7K]
3 years ago
15

Jose’s lab partner gives him a solution of sodium phosphate that is buffered to a ph 4. Because of an error that he made while c

alibrating the ph meter, Jose’s measurements of the ph of the sodium phosphate solution are 5.4,5.4, and 5.4
Which statement best describes his results
A they are accurate but not precise
B they are precise but not accurate
C they are both precise and accurate
D they are neither precise or accurate
Chemistry
2 answers:
Norma-Jean [14]3 years ago
5 0
The answer is A. I did the quiz and got it right.
vladimir2022 [97]3 years ago
3 0

Answer:

B. They are precise but not accurate.

Explanation:

I got it right on edge 2020

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The half-life of tritium (h) is 12 years. How long does it take for 16. 0 ng of tritium to decay to the point where 2. 0 ng rema
kumpel [21]

Answer:

36 years

Explanation:

2 =  16   *   (1/2)^n          where n is the number of half lives

2/16 = (1/2)^n

1/8 =  (1/2)^n

log (1/8)  = log (1/2^n)

log(1/8) =  n log (1/2)

log ( 1/8 ) / log(1/2) = n = 3  half lives

each half life is 12 years    so  3 * 12 = 36 years      

6 0
2 years ago
Lab worksheets oh what a tangled web we weave
AVprozaik [17]
<span>Proper format and submission of lab worksheets is helps develop professional standards. Please follow all format and submission guidelines carefully. The guidelines are meant to provide all employees with a standard organizational format for information from in progress and completed lab work. Also providing easy work flow should you have stop any where in process of a lab.</span>
8 0
3 years ago
What is the frequency of electromagnetic radiation with a wavelength of 6.34 x 10^8 m?
Svetllana [295]
<h2>Answer: 4.72 × 10⁷  s⁻¹ or Hz</h2><h3>  Explanation: </h3>

frequency = speed of light ÷ wavelength

frequency = (2.99 × 10⁸  m/s)  ÷  (6.34 × 10⁸  m)

                  =  4.72 × 10⁷  s⁻¹ or Hz

8 0
3 years ago
If you are involved in a vehicle accident, you should not drink any alcohol up to ___ hours after the accident or you could be l
Luda [366]

Answer: 6

Explanation:

Alcohol is a psychoactive drug with a high number of side effects that can seriously affect our body. <u>The amount and circumstances of consumption play an important role in determining the duration of intoxication.</u> For example, consuming alcohol after a large meal is less likely to produce visible signs of intoxication than on an empty stomach.

Alcohol has a two-phase effect on the body, meaning that its effects change over time.  Initially, it produces feelings of relaxation and joy, but later consumption can lead to blurred vision and coordination problems.  Cell membranes are highly permeable to alcohol, so once alcohol is in the bloodstream, it can spread to almost all body tissues.  

Unconsciousness can follow excessive consumption, and extreme levels of consumption can lead to alcohol poisoning and death. Death can also be caused by asphyxiation, if vomit - a frequent result of excessive drinking - blocks the windpipe and the individual is too drunk to respond.  An appropriate first-aid response to an unconscious, drunk person is to place him or her in the recovery position.  

<u>When alcohol enters the bloodstream (30-90 minutes after ingestion), there is a decrease in the sugars present in the bloodstream, causing a feeling of weakness and physical exhaustion. </u> This is because alcohol accelerates the transformation of glycogen (a substance that stores sugar in the liver) into glucose, which is then eliminated more quickly.  

After the ingestion of alcohol, a series of effects or symptoms occur in the short term, depending on the dose ingested (although other individual factors are affected).

  • Euphoria and excitement phase
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Alcohol is broken down mainly in the liver, which can metabolize about 1 drink per hour for men. Factors such as age, weight, gender, and the amount of food eaten can affect how quickly the body can process alcohol. The amount of time alcohol can be detected in blood is up to 6 hours. Then it is not recommended to drink alcohol until after 6 hours if you have been involved in an accident, since alcohol can be detected in the blood in that time range. <u>Because of the effects alcohol has on the body and how it can affect driving, if alcohol is detected you can be legally charged with driving under its influence.</u>

6 0
3 years ago
Write the net ionic reaction for the following double replacement reaction:
Schach [20]

Net ionic equation

Cu²⁺(aq)+S²⁻(aq)⇒CuS(s)

<h3>Further explanation</h3>

Double-Replacement reactions. Happens if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product

In the ion equation, there is a spectator ion that is the ion which does not react because it is present before and after the reaction  

When these ions are removed, the ionic equation is called the net ionic equation  

For gases and solids including water (H₂O) can be written as an ionized molecule  

Reaction

CuSO₄(aq)+Na₂S(aq)⇒CuS(s)+Na₂SO₄

ionic equation

Cu²⁺(aq)+SO₄²⁻(aq)+2Na⁺(aq)+S²⁻(aq)⇒CuS(s)+2Na⁺(aq+SO₄²⁻(aq)

spectator ions : 2Na⁺ and SO₄²⁻

Net ionic equation

Cu²⁺(aq)+S²⁻(aq)⇒CuS(s)

6 0
3 years ago
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