Describe the structure of the water molecule and indicate how this structure is responsible for many of the unique properties of this vital compound.

Answers

Answer 1

Answer: 1) Water is a polar solvent due to difference in the electronegative values between the hydrogen and oxygen which sees the Oxygen end of the molecule having a slightly negative charge while the hydrogen end has a slightly positive charge. This allows water to dissociate to form positive and negative ions.
$H_(2)O$ ⇄ $H^(+) + OH^(-)$
Because water is able to form positive and negative ions in solution and as such it is able to dissolve compounds because the negative and positive ions it possesses break the bonds of compounds and keep them apart. This is why it is a Universal Solvent and why it can dissolve solutes in the blood, be a medium of transport in plants, make up a large percent of cell cytoplasm and aid in aquatic environment survival.

2) Water because of its dipole is able to form hydrogen bonds which is where a highly electronegative atom in a molecule with a lone pair of electrons in this case the oxygen in water bonds with the hydrogen of another molecule.
a) this allows water to have a high specific heat capacity which means that a lot of heat energy is needed to change water by 1°C. This is because much energy is needed to break the hydrogen bonds in water. This allows water to maintain body temperature by absorbing energy in the form of heat in the body with there only being an incremental change in the temperature of the body.
b) Because of the hydrogen bonding between water molecules, water also possesses a high heat of vaporization which means that much energy is needed to convert 1kg of water from its liquid state to its gaseous state. With this being the case, water can act as a coolant by absorbing the heat from a body an remove it when it evaporates as it is in the case of sweat.
c) The hydrogen bonds also allow water at the surface to contract so that it occupies the least possible area. This sees where water forms a thin layer atop a water body. This allows for some objects to float atop the water and also allow some small animals to move across the surface of water often as an escape from predators.
Water also has a high cohesive and adhesive power and this attraction is more powerful than gravity. This allows water to move through capillaries and up xylem vessels in plants.

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Which of the following is NOT a common property of bases?a. feels slippery
b. tastes bitter
c. reacts with metals
d. changes colors of indicators

Answers

Bases are a class of compounds composed mainly of metal oxides and metal hydroxides. Bases exhibit the following properties:
Slippery feeling because they react with oils on the skin's surface to form soap.
Bitter taste
Changes color of indicators

However, bases do not react with metals. Therefore, the answer is C.

Add 3 x 10^9 +5.3 x 10^10

Answers

Add 3 x 10^9 +5.3 x 10^10

3 x 10^9
+5.3 x 10^10
------------------
5.6 x 10^10

Answer:

3*10⁹ + 5.3*10¹⁰ = 5.6*10¹⁰

Explanation:

The values are given as exponents:

3*10⁹ and 5.3*10¹⁰

As per the rules:

-Before adding two numbers, all exponents must be the same

-The addition takes place between the numerical portion of the numbers

- The final value is rounded off to the least places in the decimal portion of the given numbers

Therefore, the two numbers to be added are:

$3*10^(9)+53*10^(9)=56*10^(9)$

Rounded off the final value to 1 decimal place gives:

5.6*10¹⁰

Jams, jellies, preserves, honey, and other food with high sugar content hardly ever become contaminated by bacteria, even when the food containers are left open at room temperature. This is because bacteria that encounter such an environment ___________.

Answers

Answer:

undergo death as result of the water loss from cell

Explanation:

The ingredients such as honey, jellies, Jams, preserves and other food which have high sugar content are contaminated hardly by the bacteria because due to the presence of high amount of the sugar and carbohydrates, the solution of the them becomes hypertonic in nature and if a bacteria acts on such solution, the result is the loss of the water from their cell and ultimately the bacteria dies. So, they remain fresh even if their containers are left open at the room temperature.

What are the 3 parts of a nucleotide

Answers

The 3 parts are

1) A five carbon ribose sugar

2) A Phosphate molecule

3) The four nitrogenous bases

I hope that's help !

Like DNA, RNA polymers are make up of chains of nucleotides. These have three parts a five carbon ribose sugar. A phosphate molecule . And one of four nitrogenous bases adenine, guanine, cytosine, or uracil

Which highly reactive gas was probably absent from the Earth's primitive atmosphere? O2 (oxygen gas) water vapor methane carbon dioxide

Answers

The highly reactive gas that was probably absent from the Earth's primitive atmosphere is oxygen.

The atmosphere refers to the thin layer of gas above the earth's crust. This thin layer of gases is composed of a mixture of gases. The earth's primitive form also had an atmosphere.

However, we must recall that in its primitive form the earth was mostly under reducing conditions and there was no oxygen. However, photosynthesis by plants increased the oxygen content of the earth.

Learn more: brainly.com/question/165414

Oxygen gas was most likely absent from Earth's primitive atmosphere. The current theory is that the Earth's early atmosphere was composed of mainly carbon dioxide and methane due to the high volcanic activity. Cyanobacteria and their use of photosynthesis was what caused earth's atmosphere to become oxygen enriched.
I hope that helps.

The surface temperature on Venus may approach 737 K. What is this temperature in degrees Celsius?The temperature on Mercury may drop to –265 °F at night. What is this temperature in degrees Celsius?

Answers

Answer:

i) 737 K = 463.85 °C

ii) -265 °F = -165 °C

Solution:

Converting 737 K into °C :

As we know Absolute zero (0K) is equivalent to -273. 15 °C. Hence,

K = °C + 273.15

Or,

°C = K - 273.15

Putting value of K,

°C = 737 - 273.15

°C = 463.85 °C

Converting -265 °F into °C :

As,

°F = °C × 1.8 + 32

So,

°C = °F - 32 ÷ 1.8

Putting value of °F,

°C = -265 - 32 ÷ 1.8

°C = -165 °C

To convert K to C subtract 273.15.

739K-273.15C= 465.85 C or approximately 466C

To convert F to C multiply by 1.8 and add 32.

so the answer is approximately -167 degrees celcius

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For the reaction C5H5N(aq) + H2O(l) C5H5NH+(aq) + OH-(aq), which of the following is a conjugate acid-base pair? a. C5H5N, C5H5NH+b. C5H5NH+, OH-c. H2O, OH-d. C5H5N, H2O

The nucleus of an atom of K-42 contains(1) 19 protons and 23 neutrons(2) 19 protons and 42 neutrons(3) 20 protons and 19 neutrons(4) 23 protons and 19 neutrons

Its atom contains 50 electrons and 70 neutrons

if you make a solution by dissolving 1.0 mol of Fecl3 into 1 kg of water how would the osmotic pressure of this solution compare with the osmotic pressure of a solution that is made from 1.0 mol of glucose in 1 kg of water