Most plants and all animals depend on _____ to meet their need for nitrogen.lightning strikes
denitrifying bacteria
bacteria that break apart cellulose
nitrogen-fixing bacteria

Answers

Answer 1

Answer:

Answer: nitrogen fixing bacteria

Explanation:

Most plants and animals are dependent on nitrogen fixing bacteria for their nitrogen requirements. As they are incapable of absorbing the atmospheric nitrogen directly. The soil bacteria traps the atmospheric nitrogen convert it into forms like ammonia, nitrates and nitrites which are readily absorbed by the plants and some soil borne animals.

Answer 2

Answer: They depend on nitrogen-fixing bacteria, which convert atmospheric nitrogen into a usable form.

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What is a balanced equation for the neutralization of these two compounds? HCl
Ca(OH)2

Answers

In order to balance this, you have to count each element where the elements in the reactants side and the product side should have equal number of molecules. The balanced reaction is as follows:

2HCl + Ca(OH)2 = CaCl2 + 2H2O

What is the percent by mass of water in Na2SO4 • 10H2O?

Answers

We determine the percent by mass of water in the compound by dividing the mass of water by the total mass. The total mass of Na2SO4.10H2O is equal to 322 g. The mass of water is 180 g.

percent by mass of water = (180 / 322)*(100 %) = 55.9%

55.92 percent is the correct answer for online chemistry I just took the test!

Which statement explains why a molecule of CH4 is nonpolar?(1) The bonds between the atoms in a CH4 molecule are polar.
(2) The bonds between the atoms in a CH4 molecule are ionic.
(3) The geometric shape of a CH4 molecule distributes the charges symmetrically.
(4) The geometric shape of a CH4 molecule distributes the charges asymmetrically.

Answers

The answer is the option (3) The geometric shape of a CH4 moleculedistributes the charges geometrically. the CH4 is a tetrahedral with theCarbon atom in the center and the four H atoms in the vertices of thetetrahedral. The C-H bond angles are all identical which makes themolecule perfectly symmetrical and so any dipolar moment will cancelmaking the molecule non polar.

The following statement explains why a molecule of $\text{CH}_4$ is nonpolar:

$\boxed{\left( 3 \right){\text{ The geometric shape of a C}}{{\text{H}}_4}{\text{ molecule distributes the charge symmetrically}}}$ .

Further explanation:

Covalent Bond

This type of bonding takes place when the bonded atoms mutually share electron pairs between them. It is also called the molecule bond. The chemical compounds formed as a result of this bond are called chemical compounds.

The polarity of any bond is primarily governed by two factors; electronegativity difference and symmetry. A bond is said to be polar if the bonded atoms have a considerable molecular bondelectronegativity difference between them. But if there is very small or no electronegativity difference between the bonded atoms, the resulting bond is nonpolar in nature.

Symmetry is another factor responsible for the polarity of the bond. The charge distribution is symmetrical in case symmetry is present in the molecule and as a result, the molecule is said to be nonpolar. But if there is asymmetry in the shape of the molecule, it will be polar in nature.

The electronegativity difference between carbon and hydrogen atoms in $\text{CH}_4$ molecule is very small or negligible so the bonds between the atoms in $\text{CH}_4$ are nonpolar in nature. But the hydrogen atoms are placed in symmetrical positions with respect to the central carbon atom, imparting symmetry to $\text{CH}_4$ molecule and therefore it is nonpolar (For structure, refer to the attached image).

Learn more:

Identification of ionic bonding: brainly.com/question/1603987
Chemical bonds in NaCl: brainly.com/question/5008811

Answer details:

Grade: High School

Chapter: Ionic and covalent compounds

Subject: Chemistry

Keywords: covalent bond, covalent compounds, CH4, carbon, hydrogen, symmetry, electronegativity difference, nonpolar.

What volume, in Liters, of a 2.00 M KCl solution contains 2.5kg of KCl? Molar mass of KCl= 74.55g/mole

Answers

According to the molar concentration, volume in liters of 2 M KCl solution is 16.76 L.

What is molar concentration?

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Volume required is obtained by molarity formula as, 2×74.55/2500=1/V=0.05964

∴V=1/0.05964=16.67 L.

Thus, 16.67 L of 2 M KCl solution contains 2.5 kg of KCl.

Learn more about molar concentration,here:

brainly.com/question/21841645

#SPJ2

$C_(m)=(n)/(V_(r))\n\nn=(m_(s))/(M)\n\nC_(m)=(m_(s))/(MV_(r)) \ \ \ |*MV_(r)\n\nC_(m)MV_(r)=m_(s) \ \ \ |:C_(m)M\n\nV_(r)=(m_(s))/(C_(m)M)\n\n\nm=2.5kg=2500g\nM=74.55(g)/(mol)\nC_(m)=2(mol)/(L)\n\nV_(r)=(2500g)/(2(mol)/(L)*74.55(g)/(mol))\approx16.77L$

Because of their large mass and charge, alpha rays are the least penetrating and least dangerous.

Answers

This is true.
Beta and Gamma radiation are the most dangerous because they can penetrate the skin, and damage the cells inside.

Alpha is the least dangerous.

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