NEED HELP ASAP PLEASEWhich of these compounds is covalently bonded?
Select one:
a. KF
b. MgF2
c. NO2
d. Na2S

Answers

Answer 1
Answer: C. NO2 is covalent. Hope this helps!

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What reaction is depicted by the given equation: Au3+ + 3e− Au
Molecules in a sample of NH3(l) are held closely together by intermolecular forces(1) existing between ions(2) existing between electrons(3) caused by different numbers of neutrons(4) caused by unequal charge distribution
In a fission reaction of U-235, there was a release of 9.20 × 1011 kJ of energy. What amount of mass in kilograms would have been lost?Recall that c = 3 × 108 m/s.
What is significant about the temperature absolute zero
Use the following table to answer the question. Strong acids Weak acids Weak bases Strong bases HBr CH3COOH NH3 NaOH HCl HF NH4OH KOH H2SO4 HCN Cu(OH)2 Ca(OH)2 Which of these salts has the highest pH? K2SO4 Cu2SO4 NH4Cl NaCH3COO

several natural products have been isolated the flowering plant sacrostemma acidum, which has been used in folk medicine

Answers

Several natural products have been isolated from the flowering plant Sacrostemma acidum, which has been used in folk medicine as a cough suppressant.

Nаturаl products hаd been used by mаny cultures аnd trаditions from thousаnds of yeаrs for their bioаctive phаrmаcophores by modern phаrmаceuticаl compаnies. The potentiаl bioаctive phytocompounds such аs аlkаloids, flаvonoids, phenolic compounds, аnd steroids аre potentiаl source for drug discovery.

Sacrostemma acidum has been used in folk medicine as a cough suppressant. Acidum stem extrаct resulted in аn аrrest of spermаtogenesis without аny systemic side effect. Sperm motility аs well аs sperm density wаs reduced significаntly.

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Which of the following changes should improve water solubility? A. adding a methyl group B. adding a hydroxyl group C. adding a carboxyl group D. increasing the size of the drug E. adding a benzene ring

Answers

Answer:

B. adding a hydroxyl group C. adding a carboxyl group

Explanation:

Solubility in water is due to the polar interactions or the hydrogen bonding.

Methyl group and benzene ring are both polar and hydrophobic in nature and thus will not improve water solubility.

Increasing size of drug will make more insoluble as more size of the solute is being added.

Adding hydroxyl or carboxyl group can improve water solubility as both the groups are highly hydrophilic and polar. These groups can form hydrogen bond with the water molecules and make drug more soluble in the water.

The best tool to use to locate the boundaries between countries is a(n) _____.interrupted area map
political map
population map
relief map

Answers

The correct answer is (b) political map

The explanation:

when a political map: is different than other types of maps because it focuses on government or administrative boundaries rather than geographical or physical features. Instead of showing viewers what exists in the land, it shows those imaginary lines that serve to separate countries, states, territories, and cities. These maps generally include larger bodies of water, such as oceans, rivers, and lakes, as landmarks.

It was made by man not natural like the others maps.

so this is the correct answer.

Final answer:

A political map is the best tool to locate the boundaries between countries, providing distinct and accurate depiction of governmental boundaries.

Explanation:

The best tool to use to locate the boundaries between countries is a political map. Political maps are designed to show governmental boundaries of countries, states, and counties.

They also indicate the location of major cities, and they usually include significant bodies of water.

Unlike other types of maps like interrupted area maps, population maps, or relief maps, a political map focuses specifically on the delineation of imaginary lines separating different political entities, making it the ideal tool for identifying country boundaries.

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Which is something that a PURE SUBSTANCE and a SOLUTION have in common?A) They both are made of one kind of particle.
B) They both are made of different kinds of particles.
C) They both look speckled or chunky.
D) They both look uniform (the same) throughout.

Answers

D) They both look uniform (the same) throughout.

Further explanation

Pure substance can be any element or compound and is formed from one type of atom/molecule only

Meanwhile, the solution is included in a mixture consisting of 2 or more pure substance

Pure substance can be formed through a chemical process while the mixture is through a physical process

Mixture can be separated by physical processes into components of pure substance while pure substance cannot

The mixture itself consists of a homogeneous and heterogeneous solution

The mixture can be divided into a homogeneous mixture if the composition/ratio of each substance in the mixture is the same and a heterogeneous mixture if the ratio of the composition of the substances is not the same (can be varied) in each place.

Mixtures can also be divided into solutions, suspensions, and colloids based mainly on the size of the particles

Homogeneous mixture = Solution

Heterogeneous mixture = suspension, and

The mixture is located between suspension and solution = Colloid

What occurs when there are oh ions in a solution

Answers

the solution is considered basic.  The more H⁺ a solution has the more acidic it is and the more OH⁻ a solution has the more basic it is.  pH=-Log[H⁺] and pOH=-log[OH⁻].  pOH+pH=14

The light emitted from a flame is produced when electrons in an excited state(1) absorb energy as they move to lower energy states
(2) absorb energy as they move to higher energy states
(3) release energy as they move to lower energy states
(4) release energy as they move to higher energy states

Answers

Electrons in their ground state when excited absorb energy and move to higher energy states.
Absorption is when energy is absorbed by electrons and they move to a higher energy state
Emission is when electrons release that absorbed energy and move to a lower energy state
This release of energy results in emission of light from a flame
The correct answer is
Release energy as they move to lower energy states

The light emitted from a flame is produced when electrons in an excited state absorb energy as they move to higher energy states. Thus option 2 is correct.

What is energy level diagram?

Energy level diagram is defined as a graphical illustration of the energies of an atom's or molecule's various orbitals.

The energy level diagram is typically shown as a sequence of horizontal lines, with each line representing an orbital.

It can also be defined as an electron shell, or energy level, can be visualized as an orbit of electrons surrounding an atom's nucleus.

Electrons absorb energy and move from ground state to exited state, and come back to original state by releasing energy.

Thus, the light emitted from a flame is produced when electrons in an excited state absorb energy as they move to higher energy states. Thus option 2 is correct.

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