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3 years ago

Which best evaluates the following statement: It's greener to wash dishes by hand than to use a dishwasher?

1 answer:

Volgvan3 years ago

3 0

It is true that energy efficient dishwasher is a water and energy saver than washing dishes by hand. A star-rated dishwasher uses 4 gallons of water in each cycle compare to a kitchen faucets who pumps out 2.5 gallons of water per minute. To conserve water, the accumulated dishes and cookware must be stack properly in a dishwasher before running a cycle. As to conservation of energy, people tend to use warm water to wash the dishes by hand and heating of water cost much, while in a dishwasher, energy-saving tips such as running a light cycle and turning off heating drying option will mark down your energy consumption. Therefore, the use of dishwasher is a much greener idea.

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Which is the best example of how electromagnetic energy is used in everyday life

mixas84 [53]

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

The best example of how electromagnetic energy is used in everyday life is a patient receiving an X-ray in a hospital

6 0

3 years ago

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An ate or ite at the end of a compound name usually indicates that the compound contains___________.

Ymorist [56]

Answer:

Explanation:

According to IUPAC nomenclature, a negative polyatomic ion has its name ending in 'ate' or 'ite'

As in carbonate (CO3^2-)

Arsenite (AsO3-)

3 0

3 years ago

Read 2 more answers

What really is the Ebola virus?

Sloan [31]

The Ebola virus belongs to a family of viruses termed Filoviridae. Filovirus particles form long sometimes branched filaments of varying shapes, as well as shorter filaments , and may measure up to 14,000 nanometers in length with diameter of 80 nanometers. Viral particles contain one molecule of single stranded RNA enveloped in a lipid membrane. New viral particle bud from the surface of their host cell. Although Ebola virus was only discovered in 1976, it is an ancient virus and is thought to have split from other viruses thousands of years ago.

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3 years ago

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,

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

$pH=7.00$

5 0

3 years ago

Select the statements that correctly describe a buffer. a) An acid added to the buffer solution reacts with the weak base of the

Tom [10]

Answer:

(B.) The pH of a buffer solution is determined by the ratio of the concentration of conjugate base to the concentration of strong acid.
(C.) A buffer is generally made up of a weak acid and its conjugate base. 
(D.) The pH of a buffer solution does not change significantly when any amount of a strong acid is added.

Explanation:

A buffer is solution which resists change in pH upon addition of either acids or bases.

The pH of a buffer is calculated by the ratio of the concentration of base to concentration of acid. The weak acid and conjugate base have a Ka similar to the pH desired.

3 0

3 years ago