CHEMISTRY COLLEGE

Which of the following examples illustrates a number that is correctly rounded to three significant figures? a. 109 526 g to 109 500 g
b. 0.03954 g to 0.040 g
c. 20.0332 g to 20,0 g
d. 04.05438 g to 4,054 g
e. 103.692 g to 103.7g

Answers

Answer 1
Answer:

Answer:

c. 20.0332 g to 20,0 g

Explanation:

A significant figure is each of the digits of a number that are used to express it to the required degree of accuracy, starting from the first non-zero digit, with the exception of the trailing zeros.

Which of the following examples illustrates a number that is correctly rounded to three significant figures?

a. 109 526 g to 109 500 g. NO. The rounded number has 4 significant figures: 109 500.

b. 0.03954 g to 0.040 g. NO. The rounded number has 2 significant figures:  0.040.

c. 20.0332 g to 20.0 g. YES. The rounded number has 3 significant figures:  20.0.

d. 04.05438 g to 4.054 g. NO. The rounded number has 4 significant figures: 4.054.

e. 103.692 g to 103.7g. NO. The rounded number has 4 significant figures: 103.7.

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Which of the following describes the element Mg. Choose all that apply. is very reactive as a metal forms a basic solution in water is found in nature only combined with other elements reacts vigorously with alkali metals to form salts consists of diatomic molecules in elemental form is one of the group of the least reactive elements

Answers

Answer:

The statements that describe Mg are:

1. is very reactive as a metal  

2. forms a basic solution in water  

3. is found in nature only combined with other elements

Explanation:

Magnesium is a s-block chemical element that belongs to group 2 and period 3 of the periodic table. It is a reactive alkaline earth metal that exists in nature only in the combined state with elements such as carbon, calcium and oxygen.

Magnesium reacts with water at room temperature, to give strongly basic metal oxide of the formula, MgO, which forms a basic solution in water.

It also reacts vigorously with halogens such as chlorine and bromine, to form salts.

Final answer:

Magnesium is a highly reactive alkaline earth metal that forms a basic solution in water and can react vigorously with alkali metals to form salts. It consists of diatomic molecules in its elemental form.

Explanation:

Magnesium is one of the alkaline earth metals, which are found in Group 2 of the periodic table. It is a highly reactive metal that forms a basic solution in water and can react vigorously with alkali metals to form salts. Magnesium also consists of diatomic molecules in its elemental form. However, it is not one of the least reactive elements; rather, it is one of the more reactive elements in Group 2.

Learn more about Alkaline Earth Metals here:

brainly.com/question/37138058

#SPJ12

Which of the following is not a reason why chemical bonds are important

Answers

What are the followings?

In living organisms, C-14 atoms disintegrate at a rate of 15.3 atoms per minute per gram of carbon. A charcoal sample from an archaeological site has a C-14 disintegration rate of 9.16 atoms per minute per gram of carbon. Estimate the age of this sample in years. The half-life of C-14 is 5730 years. (enter only the number of years in standard notation, not the unit years)

Answers

Rate of disintegration is defined as the time required by a sample or substance at which half of the radioactive substance disintegrates. It depends on the nature of disintegration and amount of substance.

The age of the sample is approximately 4241.17 years.

Given that:

C-14 atoms disintegration rates = 15.3 atom/ min-g

Rate of disintegration of the sample = 9.16 atom/ min-g

The digit proportion of carbon-14 is  = (9.16)/(15.3) = 0.5987

Now, also the half-life of carbon-14 is 5730 years.

Such that:

(1)/(2)^n = \text A

(1)/(2) = 0.5987

Taking log:

n log 2 = -log 0.5987

Thus, n = (0.227)/(0.3010)

n = 0.740

The age of the sample can be given by:

Age = n x half-life

Age = 0.740 x 5730

Age = 4241.17 years.

Therefore, the age of the substance is 4241.17 years.

To know more about disintegration rate, refer to the following link:

brainly.com/question/14021442

Answer:

The answer is "4,241 .17 years"

Explanation:

The disintegration rate, which shows in C-14 atoms =  15.3 (atoms)/(min-g)

Rate of sample disintegration =9.16 \frac{atoms} {min-gram}

The digit proportion of C-14 can be determined that is included in the sample = \frac {9.16}{15.3} \n\n = 0.5987

5730 years from half-life.  

The number with half-lives (n) which are repelled must be determined:

((1)/(2))^n= A\n\nA= fraction of C-14, which is remaining \n\n((1)/(2))^n= 0.5987 \n\n n \log 2 = - \log 0.5987\n\n

\therefore \n\n \Rightarrow n= (0.227)/(0.3010) \n\n = 0.740\n

So, the age of the sample is given by = n *\ half-life

                                                 = 0.740 * 5730 \ years \n\n=4241.17 \ years\n\n

All the following are characteristic properties of phosphorus. Which one is a chemical property?(a) When exposed to air, white phos- phorus will burn spontaneously, but red phosphorus will not.
(b) Red phosphorus and white phos- phorus are solids.
(c) The white form is soluble in liquid carbon disulfide but is insoluble in water.
(d) The red form of phosphorus is in- soluble in both water and carbon disulfide.
(e) The red form melts at about 600 ◦ C, and the white form melts at44◦ C.

Answers

Red phosphorus and white phosphorus are solid is a physical property

Modify methionine, below to show its zwitterion form. How do I make Methionine into a zwitterion?

Answers

Explanation :

Zwitter ion : An ion or molecule having separate negatively and positively charged groups.

Methionine is an amino acid with sulfur atom in its molecule .The proton from carboxylic group with get attached to amino group present in the methionine and negative charge will be generated on oxygen atom of a carboxylic group which will get in conjugation with an another oxygen atom of the carboxylic group.

The positive charge will generated on the nitrogen atom due  attachment of the proton from the carboxylic group.

As shown in the image attached.
Methionine is an amino acid and like some amino acid, it has a zwitterion form. A zwitterion form is a form of molecule showing separate positive and negative charges. The hydrogen from the carboxylic acid group will transfer to the amino group producing a negative charge at the carboxyl group and a positive charge at the amino group.

____________ acids are proton donors. ____________ bases are proton acceptors. The ____________ the pKₐ the stronger the acid. ____________ acids are electron pair acceptors.

Answers

Answer:

1. Bronsted—Lowry acid

2. Bronsted—Lowry Base

3. Lower the pka

4. Lewis acids

Explanation:
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