Which chemical equation below is balanced correctly? 3LiOH + Fe(NO3)3 yields LiNO3 + Fe(OH)3 2NaCl + CaO yields Na2O + CaCl2 Zn + HCl yields ZnCl2 + H2 Mg + HCl yields MgCl2 + H2

Answers

Answer 1

Answer: The answer is 2NaCl + CaO yields Na2O + CaCl2. The balanced equation has the same number of the same element of the reactants and products.

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What are two types of electron microscopes, and how do they work?

Answers

Scanning electron microscope (sem): an electron beam scans the surface of a specimen (coated with gold) that excites electron from the specimen which are detected and translated into an image that is three-dimensional. It is used to study the topography of a specimen

Transmission Electron microscope (TEM):a beam of electrons is passed through a thin section of specimen that is stained with atoms or heavy metals and electromagnets acts as lenses that focus the image onto a screen or film. It is used to study the internal structure of a specimen--cells

Gloria is writing the chemical formula for a compound using its chemical name. She has just identified the names of the elements in the compound. What tool will she use next?

Answers

Gloria is writing thechemical formula for a compound using its chemical name. She has justidentified the names of the elements in the compound. The tool that she willneed to use next is a textbook to learn the IUPAC naming of compounds or ahandbook of chemical compounds.

Answer:

the periodic table

Explanation:

verified correct

In a nuclear reaction, the energy released is equal to 8.1 x 1016 joules. Calculate the mass lost in this reaction. (1 J = 1 kg m2/s2) and the speed of light = 3.00 × 10^8 m/s ]Answer

7.2 x 1032 kg

2.7 x 108 kg

9.0 x 10-1 kg

7.2 x 10-16 kg

Answers

use the formula E=mc^2
energy given=8.1 x 10^16 joules
speed of light = 3.00 × 10^8 m/s

plug in the values we'll get mass=9.0 x 10-1 kg

Answer : The mass lost in this reaction will be, $9.0* 10^(-1)Kg$

Explanation :

According to the Einstein equation, the energy is equal to the product of mass and the square of the speed of light.

The mathematical expression is :

$E=m* c^2$

where,

E = energy released = $8.1* 10^(16)J$

c = speed of light = $3* 10^8m/s$

m = mass lost = ?

Now put all the given values in the above formula, we get the mass lost in the reaction.

$8.1* 10^(16)J=m* (3* 10^8m/s)^2$

$8.1* 10^(16)Kg.m^2/s^2=m* (3* 10^8m/s)^2$

$m=9.0* 10^(-1)Kg$

Therefore, the mass lost in this reaction will be, $9.0* 10^(-1)Kg$

What are the variables of Boyle's law?pressure and number of molecules of gas
volume and temperature
pressure and temperature
volume and number of molecules of gas
pressure and volume

Answers

Boyles law is P1V1=P2V2 where P is pressure and V is volume so the answer is pressure and volume

Which formula represents a nonpolar molecule containing polar covalent bonds?(1) H2O (3) NH3
(2) CCl4 (4) H2

Answers

H2O and NH3 are polar molecules. H2 is a nonpolar molecule but the H-H bond is also nonpolar.
Therefore, the best choice is CCl4. Although the C-Cl bond is polar due to electronegativity differences, the molecule itself is nonpolar because the net dipole moments cancel out, given its tetrahedral molecular structure.

$\boxed{\left( 2 \right){\text{ CC}}{{\text{l}}_4}}$ represents a nonpolar molecule containing polar covalent bonds.

Further Explanation:

The chemical bond is the attraction between atoms, molecules or ions that is responsible for the formation of chemical compounds. It is formed either due to electrostatic forces or by the sharing of electrons.

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A covalent bond is a bond formed by the mutual sharing of electrons between the bonded atoms. It is also known as a molecular bond. Such bonds usually exist between two or more non-metals.

Types of covalent bonds:

1. Polar covalent bond

This bond results from the presence of electronegativity difference between the bonded atoms. For example, the bond between hydrogen and chlorine in HCl is a polar covalent bond. In this molecule, Cl is more electronegative than H.

2. Non-polar covalent bond

When there is no or very small electronegativity difference between the bonded atoms, non-polar covalent bond is formed. Here, the net dipole moment of the molecule comes out to be zero. For example, bond between carbon and hydrogen in ${\text{C}}{{\text{H}}_{\text{4}}}$ is a non-polar covalent bond.

3. Coordinate covalent bond

When both the shared electrons are provided by the same atom, coordinate covalent bond is formed. This usually exists when metals are bonded with ligands. For example, the bond formed between cobalt and ammonia in case of hexamminecobalt (III) chloride is a coordinate covalent bond.

(1) ${{\text{H}}_{\text{2}}}{\text{O}}$

Oxygen is more electronegative than carbon so the bond between O and H is polar covalent bond. But this molecule has some net dipole moment due to its asymmetry so water molecule is a polar molecule. Therefore this option is incorrect. (For structure, refer to the attached image).

(2) ${\text{CC}}{{\text{l}}_{\text{4}}}$

Chlorine is more electronegative than carbon so the bond between C and Cl is a polar bond. But the net dipole moment of this molecule comes out to be zero. So ${\text{CC}}{{\text{l}}_{\text{4}}}$ is a nonpolar molecule with polar covalent bonds and therefore this option is correct. (For structure, refer to the attached image).

(3) ${\text{N}}{{\text{H}}_{\text{3}}}$

Nitrogen is more electronegative than hydrogen so the bond between N and H is polar covalent bond. But this molecule has some net dipole moment due to its asymmetry so ammonia molecule is a polar molecule. Therefore this option is incorrect. (For structure, refer to the attached image).

(4) ${\text{N}}{{\text{H}}_{\text{3}}}$

It contains two hydrogen atoms in it. There is no electronegativity difference between both atoms and therefore this molecule is nonpolar in nature. Moreover the bond between two hydrogen atoms is also non-polar. Therefore this option is incorrect. (For structure, refer to the attached image).

Learn more:

Identification of ionic bonding: brainly.com/question/1603987
What type of bond exists between phosphorus and chlorine? brainly.com/question/81715

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Ionic and covalent compounds

Keywords: polar, nonpolar, correct, incorrect, H2, CCl4, H2O, NH3, electronegativity difference, hydrogen atoms, asymmetry, dipole moment.

How many atoms are there in 1.3 x 10^22 molecules of N(O)2

Answers

1 molecule of NO2 included N atom and 2 oxygen atoms, so a total of 3 atoms per molecule.

1.3 x 10^22 times 3 = 3.9 x 10^22 atoms

Final answer:

The total number of atoms in 1.3 x 10^22 molecules of N(O)2 is 3.9 x 10^22 atoms since each molecule of N(O)2 consists of three atoms.

Explanation:

To answer the question of how many atoms there are in 1.3 x 10^22 molecules of N(O)2, one must be aware of the molecular composition of N(O)2. This molecule contains one nitrogen atom and two oxygen atoms, thus comprising three atoms in total. Consequently, to determine the total number of atoms, multiply the number of molecules by the number of atoms per molecule. Hence, the answer is 1.3 x 10^22 molecules * 3 atoms/molecule = 3.9 x 10^22 atoms.

Learn more about Atoms in a Molecule here:

brainly.com/question/15172278

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