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Which of the following is not one of the characteristics of the shrubland biome? A. It can also be called a chaparral or a savannah. B. It is located in polar climate zones. C. It has plants and animals that adapt to long dry seasons. D. It is often located near coasts. help guys plz

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Which of the following is not one of the characteristics of the shrubland biome? A. It can also be called a chaparral or a savannah. B. It is located in polar climate zones. C. It has plants and animals that adapt to long dry seasons. D. It is often located near coasts. help guys plz

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Why is water an excellent solvent for most ionic compounds and polar covalent molecules but not for non-polar compounds? A) Water is a polar molecule. B) Water has a charge like an ion. C) Water is a deionizing substance. D) Water molecules have an unusually high kinetic energy in the liquid state.

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A)Water is a polar molecule. When talking about solubility, the rule that “like dissolves like” is usually correct. This means that polar substances are soluble in other polar substances. This occurs because the opposite partially charged ends of different polar molecules are attracted to each other. Similarly, the partially charged ends of polar molecules will be even more attracted to the charged ends of an ionic compound’s molecule. This is why,for example, table salt/ NaCl, which is an ionic compound, dissolves in water. 

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Express the polar coordinates (-3, pi/2) as Cartesian coordinates. Choices: (-3,0) (-3,3) (0,-3) (3,-3)

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Express the polar coordinates (-3, pi/2) as Cartesian coordinates. Choices: (-3,0) (-3,3) (0,-3) (3,-3)

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Seattle, Washington, has a __________ climate. A. dry B. tropical C. moderate D. polar

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Seattle, Washington, has a __________ climate. A. dry B. tropical C. moderate D. polar

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The hot temperatures and low amounts of precipitation characteristic of Phoenix, AZ, provide an example of a __________ climate. A. dry B. moderate C. polar D. tropical

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The hot temperatures and low amounts of precipitation characteristic of Phoenix, AZ, provide an example of a __________ climate. A. dry B. moderate C. polar D. tropical

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A polar cell moves between

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A polar cell moves between

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In polar coordinates the positive x axis is called?

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Answer:

3 positive real root and 1 negative real root and no complex root.

Step-by-step explanation:

Here, the given function,

f(x) = -3x^4 + 5x^3 - x^2 + 8x + 4

Since, the coefficient of variables are,

-3,   5,    -1,    8,    4,

The sign of variables goes from Negative(-3) to positive (5) , positive(5) to negative(-1) and negative (-1) to positive (8),

So, the total changes in sign = 3,

By the Descartes’s rule of sign,

Hence, the number of real positive roots = 3,

Also,

f(-x) = -3x^4 - 5x^3 - x^2 - 8x + 4

Since, the coefficient of variables are,

-3,   -5,   -1,    -8,   4

The sign of varibles goes to negative (-8) to positive (4),

So, the total changes in sign = 1,

Hence, the number of real negative roots = 1,

Now, the degree of the function f(x) is 4,

Thus, the highest number of roots of f(x) is 4,

So, it does not have any complex root.

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Which characteristic of water allows its molecules to form hydrogen bonds? The water molecule is polar. Water has a low specific heat. Ionic bonds hold the water molecule together. Water expands as it freezes.

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Answer:

1) Water has very high specific heat.

2) It expands when it freezes

3) ability to dissolve in ionic substances

4) Water molecules at the surface experience fewer hydrogen bonds than water molecules within the liquid.

Explanation:

1) Water molecules due to their high specific heat , undergo relatively less increase in temperature after absorbing heat. So they prevent their adjoining area to experience sharp increase in temperature.

2) Water is an example which expands on freezing. In it , large spaces are left between molecules when it cools. It happens because hydrogen bonds prevent any two molecules to come very close thereby  creating gaps. This gap is filled up when ice melts , which results in overall reduction in volume of water.

3) Uneven distribution of charge results in water molecules becoming polar in nature . A polar substance  can be dissolved in polar solvents only.

4) It is due to property of surface tension. Property  of surface tension results due to molecules of water near the surface experiencing a  net downward  force due to hydrogen bonds . It is due to fewer hydrogen bonds made by them.

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The polar portion of a cholesterol molecule, which forms hydrogen bonds with the polar heads of neighboring phospholipids and glycolipids, consists of a

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The balanced chemical reaction is as shown below,

                 N₂ + 3H₂  –> 2NH₃

The equation shows that every 3 moles of hydrogen, H2, there would be 2 moles of ammonia, NH3, that is going to be formed. Using this concept, we solve for the unknown in this item. 

Since we are restricted only of the number of hydrogen, it becomes our limiting reactant. 

          (6 moles H2) x (2 moles NH3/3 moles H2) = 4 moles NH3

Therefore, given enough amount of N2, the amount of NH3 that can be formed out of the 6 moles of H2 is equal to 4 moles. 

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What is the best definition of polar covalent bond?

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Answer: The correct answer is Option B.

Explanation:

A covalent bond is formed when sharing of electrons takes place between the atoms combining. The atom which attracts the shared pair of electron towards itself is more electronegative and the atom which does not attracts the shared pair of electron towards itself is less electronegative.

In HCl molecule, more electronegative atom is chlorine atom having an electronegativity of 3.16 and hydrogen has an electronegativity of 2.1

So, majority of shared electrons will be found near to the chlorine atom in hydrochloric molecule.

Hence, the correct answer is Option B.

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True or False – One advantage of polar equations is that you can use a polar function to describe a graph whose equation in rectangular coordinates would not be considered a function.

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Answer:  The correct option is (C). 10 = square root of the quantity of x minus 8 all squared plus y minus 9 all squared

Step-by-step explanation:  Given that the segment AB has point A located at (8, 9). The distance from A to B is 10 units.

We are to select the correct option that could be used to calculate the coordinates for point B.

Let, (x, y) be the co-ordinates of point B.

According to distance formula, the distance between two points (a, b) and (c, d) is given by

d=sqrt{(c-a)^2+(d-b)^2}.

Therefore, the distance between the points A(8, 9) and B(x, y) is given by

d=sqrt{(x-8)^2+(y-9)^2}.

Since, distance between A and B is 10 units, so

d = 10.

Therefore,

10=sqrt{(x-8)^2+(y-9)^2}.

Thus, the correct statement is

10 = square root of the quantity of x minus 8 all squared plus y minus 9 all squared.

Option (C) is correct.

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Where are growth rings in trees most visible, thus making the use of dendrochronology most applicable? in tropical zones in desert areas in temperate zones in polar areas?

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a combination of oceanic-oceanic convergent boundaries, where the Pacific Plate is subducted under other oceanic plates causing deep trenches, and oceanic-continental convergent boundaries, where the Pacific Plate subducts under continental plates, causing volcano arcs.

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A large ice floe is floating at a speed of 3 kilometers per hour. A polar bear leaves the floe and swims in the opposite direction at 9 kilometers per hour. How long will it be before the polar bear is 4 kilometers away from the floe? How do I do this??? My teacher never teaches me!!

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The basis to respond this question are:

1) Perpedicular lines form a 90° angle between them.

2) The product of the slopes of two any perpendicular lines is – 1.

So, from that basic knowledge you can analyze each option:

a.Lines s and t have slopes that are opposite reciprocals.

TRUE. Tha comes the number 2 basic condition for the perpendicular lines.

slope_1 * slope_2 = – 1 => slope_1 = – 1 / slope_2, which is what opposite reciprocals means.

b.Lines s and t have the same slope.

FALSE. We have already stated the the slopes are opposite reciprocals.

c.The product of the slopes of s and t is equal to -1

TRUE: that is one of the basic statements that you need to know and handle.

d.The lines have the same steepness.

FALSE: the slope is a measure of steepness, so they have different steepness.

e.The lines have different y intercepts.

FALSE: the y intercepts may be equal or different. For example y = x + 2 and y = -x + 2 are perpendicular and both have the same y intercept, 2.

f.The lines never intersect.

FALSE: perpendicular lines always intersept (in a 90° angle).

g.The intersection of s and t forms right angle.

TRUE: right angle = 90°.

h.If the slope of s is 6, the slope of t is -6

FALSE. – 6 is not the opposite reciprocal of 6. The opposite reciprocal of 6 is – 1/6.

So, the right choices are a, c and g.

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If the argument of a complex number in polar form is 3pi/2, then it lies on the _____.

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Answer:

1 and 5 is true

Step-by-step explanation:

Given : A deck of playing cards has four suits, with thirteen cards in each suit consisting of the numbers 2 through 10, a jack, a queen, a king, and an ace. The four suits are hearts, diamonds, spades, and clubs.

Total no. of cards = 52

We are given that A hand of five cards will be chosen at random.

So, Number of Possible outcomes = ^{52}C_5

Thus Statement 1 is true

Statement 2 is false because in permutation sequence is considered .

We are not given any sequence of card for drawing 5 cards.

So, Statement 2 does not applies here .

Number of diamonds = 4

So, probability of choosing two diamonds and three hearts in draw of five cards :

= frac{13}{52} times frac{12}{51} times frac{13}{50} times frac{12}[49} times frac{11}{48}

=0.00085

Thus Statement 3 is false.

Total spades = 13

Probability of choosing 5 spades= frac{13}{52} times frac{12}{51} times frac{11}{50} times frac{10}[49} times frac{9}{48}=0.000495

Statement 4 is false.

Total no. of clubs = 13

Probability of choosing 5 clubs= frac{13}{52} times frac{12}{51} times frac{11}{50} times frac{10}[49} times frac{9}{48}=0.000495 ≈0.0005

Statement  5 is true.

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Please help i have a midterm tommorow 1)distinguish between polar compounds and non-polar compounds 2)Identify chemical bonds and the different types of bonding

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A polar bond is formed with atoms having different electronegativities. The bonding electrons are attracted more towards the atom with greater electronegativity resulting in unequal sharing of electrons. Therefore the molecule develop partial charges and becomes polar. Polar molecules have dipole moment that is the partial charge on molecules due to differences in electronegativity between atoms.

A non-polar bond is formed with atoms having the same electronegativity, hence the bonded pair of electron is shared equally between atoms. Non-polar molecules have no moment.
Note that: symmetrical molecules having polar bonds are non-polar because the dipoles of the bond exert equal and opposite effect. Hence the dipoles cancel the charges.

Example: HCl
In HCl, Cl is more electronegative therefore Cl atom pulls the electron pair of the covalent bond towards itself and develops a partial negative charge. Consequently H develops a partial positive charge. This therfore leads to the formation of a dipole.

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The complete loss of an electron of one atom to another atom with the consequent formation of electrostatic charges is said to bea. a covalent bondb. a polar covalent bondc. an ionic bondd. a coordinate covalent bonde. a pi bond between p orbitals

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Answer:

4pz and 4py

Explanation:

The electron configuration of Kr is:

[Ar] 3d¹⁰ 4s² 4p⁶

4p has 3 subatomic orbitals: 4px, 4py and 4pz

As there are a total of 6 electrons each of the three 4p orbitals have two electrons with opposite spins. Hence 4py and 4pz have equal energy. Option D is correct.  

Option A, 1s and 2s is incorrect, as the energy of the 1st orbital is lower than that of the 2nd orbital.  

Option B, 2s and 2p is incorrect, as the energy of the s suborbital is lower than that of the p, even though they both belong to the same orbital.  

Option C, 3px and 4px is incorrect, as the energy of the 3rd orbital is lower than that of the 4th orbital.  

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A molecule of carbon dioxide (CO2) contains two polar covalent bonds. Why is the molecule nonpolar? Each bond in the molecule is only moderately polar covalent. The molecule is too small to be polar. The polar bonds are oriented in opposite directions. The carbon atom has two unshared pairs of electrons.

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A molecule of carbon dioxide (CO2) contains two polar covalent bonds. Why is the molecule nonpolar? Each bond in the molecule is only moderately polar covalent. The molecule is too small to be polar. The polar bonds are oriented in opposite directions. The carbon atom has two unshared pairs of electrons.
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