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3 years ago

WILL GIVE BRAINLIEST!! :)

Chemistry

2 answers:

valentina_108 [34]3 years ago

8 0

proteins and DNA

got it right on my quiz

svetlana [45]3 years ago

5 0

Answer:

Explanation:

Nitrogen is a naturally occurring element that is essential for growth and reproduction in both plants and animals. It is found in amino acids that make up proteins, in nucleic acids, that comprise the hereditary material and life's blueprint for all cells, and in many other organic and inorganic compounds.

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During a titration, the pH of an analyte solution containing HA(aq) is 3.92 and the ratio of [A–]/[HA] is 0.41. What is the Ka o

Solnce55 [7]

Answer:

$Ka=4.71x10^{-4}$

Explanation:

Hello there!

In this case, according to the Henderson-Hasselbach equation, it is possible to write:

$pH=pKa+log(\frac{[A^-]}{[HA]} )$

Next, since we are given the pH and the [A–]/[HA] ratio, we can solve for the pKa as shown below:

$pKa=pH-log(\frac{[A^-]}{[HA]} )$

Now, we plug in the values to obtain:

$pKa=3.92-log(0.41 )\\\\pKa=3.33$

Next, Ka is:

$Ka=10^{-pKa}=10^{-3.33}\\\\Ka=4.71x10^{-4}$

Best regards!

3 0

3 years ago

The ability for carbon to form long chain or rings is

kirill [66]

Califactual. thsi is correct bcuz carbon takes 20 minutes to dissolve and ring making it a factual

8 0

3 years ago

Balance the following equation in basic solution, using the lowest possible integer coefficients. What is the coefficient of wat

zalisa [80]

Answer:

Balanced equation: $2Cr(OH)_{3}(s)+3H_{2}O_{2}(aq.)+4OH^{-}(aq.)\rightarrow 2CrO_{4}^{2-}(aq.)+8H_{2}O(l)$

The coefficient of water is 8

Explanation:

Oxidation: $Cr(OH)_{3}(s)\rightarrow CrO_{4}^{2-}(aq.)$

Balance O and H in basic medium: $Cr(OH)_{3}(s)+5OH^{-}(aq.)\rightarrow CrO_{4}^{2-}(aq.)+4H_{2}O(l)$

Balance charge: $Cr(OH)_{3}(s)+5OH^{-}(aq.)-3e^{-}\rightarrow CrO_{4}^{2-}(aq.)+4H_{2}O(l)$ ......(1)

Reduction: $H_{2}O_{2}(aq.)\rightarrow H_{2}O(l)$

Balance O and H in basic medium: $H_{2}O_{2}(aq.)\rightarrow 2OH^{-}(aq.)$

Balance charge: $H_{2}O_{2}(aq.)+2e^{-}\rightarrow 2OH^{-}(aq.)$ .....(2)

$[2\times equation(1)]+[3\times equation(2)]:$

$2Cr(OH)_{3}(s)+3H_{2}O_{2}(aq.)+4OH^{-}(aq.)\rightarrow 2CrO_{4}^{2-}(aq.)+8H_{2}O(l)$

The coefficient of water is 8.

8 0

3 years ago

A student boils water in an electric kettle for 20 minutes. Using the same mains supply, he wants to reduce the boiling time of

Bingel [31]

Answer:

The student needs to increase the length of the heating element

Explanation:

Increasing the length of the heating elements helps to increase the surface area of the heating elements which allows for more water to come in contact with the heating element

6 0

2 years ago

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). If you breathe 17 times a minute (at res

nata0808 [166]

Answer:

The volume of the air breath per day is =12240 L day ^ -1 and he volume of oxygen breathe each day is= 2570.4 L

Explanation:

Complete question: The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). If you breathe 17 times a minute (at rest), taking in and exhaling 0.50 L of air with each breath, what volume of air do you breathe each day? Air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

Solution

Given that,

The volume of the air with each breath = 0.50L

The frequency of breath is = 17 times per minute

the next step is to calculate the volume of the air breath per day

The volume of the breathed air = volume of air breathed/ breath * 17 breaths/min * 60 minutes / per hour * 24 hours/ per day

= 0.50L/ breath * 17 breath /min * 60 minutes / per hour * 24 hours/ per day

= 12240 L day ^ -1

The next step is to calculate the oxygen breathed per day:

The volume of oxygen breathed = volume of air breathed * percent oxygen in air/100

= 12240 L day ^ -1 * 21 /100

= 2570.4 L day ^ -1

Therefore for each day, the volume of oxygen breathe is 2570.4 L

5 0

4 years ago

Read 2 more answers