I NEED HELP FAST

complex conversions between units may require using __________ conversion factor

Answer:

A-1,

B-2,

C-3 is the answer of this queation

Among the given options, the compounds that would produce a basic solution are Na2O and MgO. Both of these compounds are metal oxides, which have the ability to react with water to produce hydroxide ions (OH-).

These hydroxide ions are responsible for making the solution basic. When Na2O reacts with water, it produces 2NaOH, which is a strong base. Similarly, when MgO reacts with water, it produces Mg(OH)2, which is a weak base.
On the other hand, CO, CO2, and BeH2 are not capable of producing basic solutions because they are either non-metallic compounds or have a covalent bond between two non-metals. These types of compounds do not contain any hydroxide ions that can dissociate in water and produce OH- ions. Therefore, they cannot increase the pH of the solution and make it basic.
In conclusion, among the given options, only Na2O and MgO would produce a basic solution due to their ability to react with water and produce hydroxide ions.

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Answer:299,800,000

Explain: The speed of light is 3.00x108m/s and in mph is 6.708 x 108.

React with metal : property of acidic solutions.

PH > 7 : property of basic solutions.

Feels slippery: property of basic solutions

PH = 7: property of neutral solutions.

Tastes sour : property of acidic solutions.

more H+ ions than : property of acidic

OH- ions solutions.

OH- ions & H+ ions : property of neutral

present in equal solutions

amount

PH< 7 : property of acidic solutions.

conducts : property of acid solutions,

electricity property of basic solutions,

in Water property of acid & base

solutions

Tastes bitter : property of basic

solutions.

Answer:

Independent Variable: Type of fertiliser

Dependent Variable: Height of plant

Controlled Variables: Location of plant, volume of water, soil pH, amount of fertiliser, type of plant

Control: No fertiliser plant

Explanation:

Independent variables are the one thing in the experiment that we change to test someting. In this case, we are changing the type of fertiliser used to test which type of fertiliser is best for maximum plant growth.

Dependent variables are thing that is being measured in the experiment. In this experiment, we are measuring the height or growth of the plant.

Controlled variables (I assume this is what you call a constant) are the things that stay the same to ensure the experiment is valid and is a fair test.

Controls are something that the independent variable is not applied to, often used to compare the results of those that are influenced by the independent variable. In this experiment, we can use a control which is a plant that is not given any fertiliser. The height of this plant can then be compared to those given fertiliser to see if fertiliser can actually make a plant grow taller or not have an effect at all.

Answer:

A. Metalloids.

Explanation:

Metalloids. Metalloids, also called semiconductors, are the elements that border the zigzag line on the periodic table.

a. The potential for an Fe3+/Fe2+ half cell when using a saturated calomel electrode (SCE) is +0.9944V, and when using a standard hydrogen electrode (SHE) is +0.750V. When using a standard silver/silver chloride electrode (Ag/AgCl) the potential is +0.947V.

Here, correct answer will be

b. A selective electrode is an electrode that is designed to measure the activity of a specific ion in an aqueous solution. Selective electrodes are able to measure the activity of the ion of interest in the presence of other ions that are present in the solution.

c. Ion selective membranes are thin, permeable layers that allow only certain ions to pass through them. They are used in ion-selective electrodes, which are specialized electrical meters that measure the activity of a particular ion in a solution. Ion-selective membranes can be made from organic materials, such as cellulose acetate, or from inorganic materials, such as silica.

d. Alternating current (AC) is an electric current that reverses direction periodically. In contrast, direct current (DC) is an electric current that flows in one direction only.

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Answer:

a) The predominant Brownstead-Lowry acid- base is perchloric acid

b) A conjugate acid base pair is HClO4 and ClO4^-

c) forward reaction is favored and equilibrium position lies towards the far right

Explanation:

The molecular equation is;

HClO4(aq) + NaH2PO4(aq) -----> H3PO4(aq) + NaClO4(aq)

The net ionic equation of the reaction is;

H^+(aq) + H2PO4^-(aq) ----> H3PO4(aq)

The predominant Brownstead-Lowry acid- base is perchloric acid .

A conjugate acid base pair is HClO4 and ClO4^-

Since the both species; perchloric acid and sodium dihydrogen phosphate are both highly soluble in water yielding ions and also dissociate to a large extent in solution, the forward reaction is favoured leading to the formation of phosphoric acid. Remember that phosphoric acid does not easily dissociate in solution hence the forward reaction is faster than the reverse reaction and the equilibrium position lies towards the far right.

Answer: atomic nucleus

Explanation:

An electron domain consists of ; All of the above options  i.e.  a ) nonbonding pair of electrons   b) a single bond     c) a multiple bond.

An Electron domain is the number of bonded locations ( lone pair or bonded ) found around an atom. and the bond location is independent of the type of bonding existing between atoms in a molecule.

Electron domain are also known as electron groups. the types of electron domain are ; nonbonding pair of electrons and bonded atom.

Hence we can conclude that An electron domain consists of ; nonbonding pair of electrons,  a single bond and  a multiple bond.

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Answer:

In the esterification reaction, an OH from the molecule acid and H from the alcohol form a molecule of water.

Ethanol and butanoic acid forms ethyl butanoate

The cation formed when a sodium atom loses an electron is called the sodium ion, which is represented by the symbol Na+.

This ion is commonly found in many chemical compounds and is important for various biological processes. When sodium atoms react with nonmetals, such as halogens, they form ionic compounds called sodium halides.

The loss of an electron by sodium creates a positively charged ion, which is attracted to negatively charged ions or molecules.

This attraction forms strong ionic bonds that hold the compound together. The correct answer to the given question is option d.

It is important to note that the terms "sodate ion", "sodide ion", and "soda ion" are not used to describe the cation formed by the loss of an electron from a sodium atom.

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1) Grams of lead.

Convert grams of lead (II) nitride to moles of lead (II) nitride

Convert moles of lead (II) nitride into moles of Pb

Convert moles of Pb into grams of Pb

There is 31.64 g of ions of lead in the sample of paint.

1-Bromo-1-chloropropane has a bromine atom bonded to the first carbon (C1), a chlorine atom bonded to the second carbon (C2), and the remaining carbons connected in a chain. The highest Newman projection looking down the C1-C2 bond shows the C1 atom in the front, the C2 atom at the back, and the other atoms (Br, C3, and Cl) attached to the C1 atom.

Here's the structure of 1-bromo-1-chloropropane, showing wedges and dashes:

     Br

      |

      C

     /

    C

   /

  C - Cl

To draw the highest Newman projection looking down the C1-C2 bond, we need to imagine looking along that bond with the C1 atom in front and the C2 atom at the back. The attached atoms (Br, C1, C3, and Cl) will be represented as circles.

Here's the highest Newman projection:

      Br

       |

       C3

      /

     C1

    /

   C2

  /

 Cl

The C1 atom is represented by the intersection of the horizontal and vertical lines, while the C2 atom is shown as the circle at the end of the vertical line. The other atoms (Br, C3, and Cl) are attached to the C1 atom, and their positions are represented by their corresponding circles.

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Answer:

When you are in the laboratory and take a direct sniff the chemicals you are using, you run the risk of damaging your mucous membranes or your lungs. When its necessary to smell chemicals in the lab, the proper technique is to cup your hand above the container and waft the air towards your face.

Gas is a naturally odourless substance, but the completely harmless artificial smell is added to make it more detectable. The substance is called mercaptan and gives off a strong sulphur like smell.

Answer:

The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element.

Explanation:

Answer:

in covalent bond electrons are shared by atoms

Answer:

270 sec . ( = 4 min . 30 sec . ) Explanation: Any radio wave is moving at the speed of light, regardless of the frequency, so the frequency should be superfluous information. The speed is light is close to 300 , 000 k m s I take the distance you are given, to be 8.2 ⋅ 10 7 k m (since 8.2 ⋅ 107 k m doesn't make good sense - it's less than 1000 km) i.e. 82 , 000 , 000 km.

Before we actually compute this, we can notice that this is a little more than half the distance of the earth from the sun (150 mill. km), a distance the light uses 500 sek. = 8 min 20 sec. to travel, so we should get about 4 1 2 min for the radio wave to reach Mars from the earth.

Actual calculation: 82 , 000 , 000 km/300 , 000 k m s = 820 3 s = 273.3 s As the distance is given with 2 significant figures, we round this off to 270 sec = 4 min 30 sec.

Explantation:

Hope this helps =)

In Lei's experiment, one step of the procedure requires her to bring some water to a boil. Lei should use OC.a Bunsen burner and a balance.

Because it can operate with a variety of gases, has a single flame, and allows for adjustable heat output, the Bunsen burner is crucial in laboratories. Scientists utilize a variety of beakers in the lab. Scientists mix and track the responses of various compounds within them.

The following are three general safety guidelines when using a Bunsen burner: Never leave the lab with the burner on and never leave open flames unattended. Once the gas has been used up, turn it off. Before handling the burner, allow it to cool. Before leaving the lab, make sure the main gas valve is closed.

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Answer:biomass energy, hydropower, and wind energy

Explanation:

Answer:

who's asking?

Explanation:

The hydrocarbons in order of the decreasing boiling point is :

Paraffin > Octadecane > Hexane > Neo-hexane > Ethane

The correct option is B.

In the hydrocarbon, the boiling point is directly varies with the length of the carbon chain. If we increasing the number of the carbon atom then the boiling point of the compound will also increases. The Paraffin contains the highest number of the carbon atoms and the ethane is comprised of the  two carbon atoms.

The decreasing order of boiling point of the compound are as follows :

Paraffin > Octadecane > Hexane > Neo-hexane > Ethane

Therefore, the option B is correct.

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Answer:

different

Explanation:

A chemical reaction may be defined as the process or method by which a substance undergo a change in their structure chemically when reacting with some other substance and acquiring the property of both or sometimes forms a new substance. It leads to the chemical transformation of the chemical substance to some another substance.

The properties of the new substance formed is different form the parent substance before the reaction.

Thus, when chemical reaction occurs, the properties of the substances before the reaction and after the reaction takes place is different.

Smoke comes off from the mystery liquid and crushed sugar because of change in energy.

The mystery liquid might be an acid. Carbon, hydrogen, and oxygen atoms make up sugar. In a highly exothermic process, the acid takes water from the sugar, producing heat, steam, and fumes of acid oxide. The reaction smells very much like caramel, minus the sulfury smell. The white sugar oxidizes and transforms into a black carbonaceous tube that protrudes from the beaker in the form of smoke.

Therefore, when the crushed sugar was added in that liquid it turned the sugar black and few seconds later, the smoke came off while leaving the beaker hot.

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The difference between atom and molecule is that a molecule is two or more atoms chemically bonded together.

Atom is the smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons. Atoms are the smallest unit of matter that exhibit the characteristic properties of an element.

On the other hand, a molecule is the smallest particle of a specific element or compound that retains the chemical properties of that element or compound.

A molecule is two or more atoms held together by chemical bonds. This means that a molecule is a combination of atoms.

Examples of an atom of an element are as follows:

Examples of molecules are as follows:

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To calculate the molarity of a solution, we need to divide the moles of solute by the volume of the solution in liters. Here's how we can calculate it step by step:

Convert the mass of Na2CrO4 to moles:

  The molar mass of Na2CrO4 can be calculated by adding the atomic masses of each element:

  Na: 22.99 g/mol x 2 = 45.98 g/mol

  Cr: 52.00 g/mol

  O: 16.00 g/mol x 4 = 64.00 g/mol

  Total molar mass = 45.98 g/mol + 52.00 g/mol + 64.00 g/mol = 161.98 g/mol

  Now, we can calculate the moles of Na2CrO4 by dividing the given mass by the molar mass:

  Moles of Na2CrO4 = 12.9 g / 161.98 g/mol ≈ 0.0795 mol

Convert the volume of the solution to liters:

  The given volume is 720 mL. We need to convert it to liters by dividing by 1000:

  Volume of solution = 720 mL / 1000 mL/L = 0.720 L

Calculate the molarity:

  Molarity (M) = Moles of solute / Volume of solution in liters

  Molarity = 0.0795 mol / 0.720 L ≈ 0.11 M

Therefore, the molarity of the solution prepared by dissolving 12.9 g of Na2CrO4 in enough water to produce a solution with a volume of 720 mL is approximately 0.11 M.

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Answer:

Sublimation is a physical change. When a substance sublimes, it changes from a solid to a gas without going through the liquid phase.

Explanation: