Answer:
Determining the pH of substances such as purple grape juice and catsup using test strips can be difficult. Why?
Explanation:
Due to the tartaric acid present in these substances, this is a weak acid and is the predominant type of acid in grapes.
pH meters for these substances, measure the total acidity of the sample and convert it into tartaric acid concentration; The test strips are a qualitative method of measurement and their result can give different opinions.
 
        
                    
             
        
        
        
Answer:
So, you're dealing with a sample of cobalt-60. You know that cobalt-60 has a nuclear half-life of 
5.30
 years, and are interested in finding how many grams of the sample would remain after 
1.00
 year and 
10.0
 years, respectively.
A radioactive isotope's half-life tells you how much time is needed for an initial sample to be halved.
If you start with an initial sample 
A
0
, then you can say that you will be left with
A
0
2
→
 after one half-life passes;
A
0
2
⋅
1
2
=
A
0
4
→
 after two half-lives pass;
A
0
4
⋅
1
2
=
A
0
8
→
 after three half-lives pass;
A
0
8
⋅
1
2
=
A
0
16
→
 after four half-lives pass;
⋮
Explanation:
now i know the answer
 
        
             
        
        
        
Well partly yes because air pollution can happen when we burn fossil fuels, it can happen when we use vehicles and household/farming chemicals can cause air pollution so yes it is caused by humans
        
                    
             
        
        
        
<h3> 
<u>ANSWER</u></h3>
2. Neon, only
<h3>
<u>EXPLANATION</u></h3>
When Na and F combine they form an electron configuration of 2-8. Na electron configuration is 2-8-1 while F is 2-7, so when they form an ionic bond F will gain Na outermost electron to complete its valence shell due to having a higher negativity. Neon has an electron configuration of 2-8 but argon has 2-8-8.