a certain ore is 35.4% nickel by mass. how many kilograms of this ore would you need to dig up to have 55.0 g of nickel?

Yes this statement is true

when gas molecules are cool they are sluggish and they take up less space this yes this statement is true because when gas is cool in that gas particles they are stop moving about so fast and eventually form liquid and take up less space this process is called as condensation and occur at same temperature as boiling and cooling in gas molecule also decrease the speed of the molecule.

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Answer:

A. 3

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What are significant figures?

Significant figures are used to establish the number which is presented in the form of digits. These digits carry a meaningful representation of numbers. The term significant digits are also used often instead of figures. We can identify the number of significant digits by counting all the values starting from the 1st non-zero digit located on the left. For example, 12.45 has four significant digits.

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Answer: A

Explanation:

1.89 ==> 1 + 8 + 9 ==> 3 sig figs ==> A

Compelling questions evoke thought and do not have a straight answer.

The term compelling questions could be used to describe those types of questions that could have as many answers as possible based on the perspective of a person. There is no single answer to a compelling question.

The compelling questions are;

The term supporting questions refers to the questions that buttress a point. They include;

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Answer: monke.

Explanation: 100% correct

The class to which the compound present in several foods with the formula C44H86O8NP belongs to is lipids.

What are class of compounds?

Compound Classification Compounds can be divided into ionic and covalent classes based on how they form. When a metal and a non-metal come together, ionic compounds are created. Due to the presence of ions, they are also known as electrovalent compounds.

The MMPE compound is the one that makes up the chemical's molecule. Monomethylphosphatidylethanolamine is referred to as MMPE. It is a member of the lipids class and is found in a variety of foods.

Thus the molecule belongs to the class of lipids.

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irreducible complexity is the idea that many molecular machines are simply too complex to have formed via evolution.

What is irreducible complexity?

According to the irreducible complexity (IC) theory, no less complex system would function if some biological systems had evolved by natural selection from a series of minor adjustments to pre-existing functional systems. The creationist theory of intelligent design has made irreducible complexity a core tenet, whereas science rejects both intelligent design and the idea of irreducible complexity. One of the two primary defences of intelligent design, along with specified complexity, is known as irreducible complexity.

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Carbon, Oxygen and Hydrogen are pure elements with their unique properties and ethanol is a compound with completely different properties made with a mixture of these three elements.

Carbon is a greyish black solid in its pure form. Oxygen in its pure form is a colourless, odourless and tasteless gas. Hydrogen is a colourless, odourless, tasteless, non-toxic and highly combustible gas in its pure form.

Ethanol, having all the three mentioned elements is an organic compound with a characteristic pungent taste and wine-like odour. Ethanol is a colourless, flammable and volatile liquid.

Ethanol is generally produced due to natural fermentation of alcohols and sugars. It is chemically written as [tex]C_2H_5OH[/tex] and has a molar mass of 46.07g/mol and boiling point of 78.37℃.

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An indicator dye called bromothymol blue (BMB) turns yellow in the presence of an acid. The pH of the solution is lowered when carbon dioxide is added because carbonic acid is formed as a result.

An indicator dye called bromothymol blue (BMB) turns yellow in the presence of an acid. The pH of the solution is lowered when carbon dioxide is added because carbonic acid is formed as a result.

Bromothymol blue with concentrated hydrochloric acid is the magenta color on the left. Bromothymol blue can be used as a respiratory indicator or for monitoring photosynthetic processes (turns yellow as CO 2 is added). Exhaling via a tube into a neutral BTB solution is a typical way to demonstrate BTB's pH indicator abilities.

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For elementary reaction, coefficients in a balanced chemical equation are the same as the exponents in the rate law.

For elementary reactions, the order of the elementary reaction is that the same as its molecularity. In contrast, the speed law cannot be determined from the balanced chemical equation for the overall reaction

Do coefficients affect reaction rate?

But the coefficient affects the worth of rate constant K. the worth of the coefficient k changes with the conditions that affect reaction rate, like temperature, pressure, area , etc. A smaller rate constant value shows that the reaction is slow, while a bigger rate constant indicates a faster reaction.

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4 covalent bonds will be formed by Group 4A elements. One carbon atom forms a connection with four hydrogen atoms to create the methane molecule (CH4).

When two atoms exchange one or more pairs of electrons, a covalent connection is created. These electrons are being drawn to the two atomic nuclei at the same time.

When the difference between the electronegativities of two atoms is too tiny for an electron transfer to take place to create ions, a covalent bond is formed.

Atoms join together in a covalent bond by exchanging electrons. Nonmetals typically form covalent connections with one another. For instance, each hydrogen (H) and oxygen (O) atom in water (H2O) shares a pair of electrons to form the molecule of two single-bonded hydrogen atoms and one single-bonded oxygen atom.

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The volume of the balloon after he heats it to a temperature of 250.0°C is 0.718L.

The volume of a balloon at a particular temperature can be calculated by using the Charles law formula as follows:

V1/T1 = V2/T2

Where;

According to this question, a man heats a balloon in the oven. The balloon initially measures 0.402L with a temperature of 20.0°C. However, the volume of the balloon after he heats it to a temperature of 250.0°C can be calculated as follows:

0.402/293 = V2/523

523 × 0.402 = 293V2

210.25 = 293V2

V2 = 210.25/293

V2 = 0.718L

Therefore, the volume of the balloon after he heats it to a temperature of 250.0°C is 0.718L.

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The volume of the stock solution is 6.25 mL.

Stock solutions are manufactured by the technician or pharmacist and have a known concentration for ease of dispensing.

A closed surface-enclosed three-dimensional space's volume is measured physically.

12 molar of HCl is required to make 500 ml of 0.15 liters.

The number of moles n of HCl can be calculated as:

c = n / V

n = c × V

n = 0.15 M × 500 ml

n = 0.15 M × 500 × 10⁻³

n = 0.075 moles HCl

Now, the volume of the stock can be calculated using the number of moles of hydrochloric acid.

c = n / V

V = n / c

V(stock) = 0.075 moles / 12 M

V(stock) = 0.075 moles / (12 moles/ L )

V(stock) = 0.00625 L

V(stock) = 0.00625 × 10³ mL

V(stock) = 6.25 mL

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The ph of a dilute solution that contains a molar ratio of potassium acetate to acetic acid  is 5,46.

pH pKa log

pH 4.76 log ([acetate]/[acetic acid]), where [acetate]/[acetic acid] is the ratio given for each part of the question.

pH = pka + log [acetate/acetic acid]

pH = 4.76 + log ( 5/1)

pH = 5.46

Ethanoic acid, ethylic acid, vinegar acid, and methane carboxylic acid are other names for acetic acid, which has the chemical formula CH3COOH.

As a byproduct of fermentation, acetic acid gives vinegar its distinctive smell. About 4-6% of the acetic acid in vinegar is water.

Acetic acid, officially known as ethanoic acid, is an organic molecule with the chemical formula CH3COOH that is acidic and colorless. Apart from water and other trace ingredients, vinegar has at least 4% acetic acid by volume, making acetic acid its primary ingredient.

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Answer:

77N

Explanation:

f=ma

f=11×7

force= 77N

The balanced net ionic equation when aqueous solutions of Al(NO₃)₃ and Na₃PO₄ are mixed is:

Al³⁺(aq) + PO4³⁻(aq)(aq) → AlPO₄(s)

Balanced molecular chemical equation:

Al(NO₃)₃ (aq) + Na₃PO₄(aq) → AlPO₄(s) + 3NaNO₃(aq)

The balanced ionic equation:

Al³⁺(aq) + 3NO₃⁻(aq) + 3Na⁺(aq) + PO₄³⁻(aq) → AlPO₄(s) + 3Na⁺(aq) + 3NO₃⁻(aq)

The balanced net ionic equation: Al³⁺(aq) + PO₄³⁻(aq) → AlPO₄(s)

Aluminium phosphate (AlPO₄) is a white solid inorganic compound.

(s) is solid state of matter.

(aq) is aquatic solution

This is an example of the double replacement reactions (double displacement or metathesis reactions), two ionic compounds are exchanged, making two new compounds.

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The pH of the solution formed by adding 4.3 * 10^-5 moles of KOH in one litre of water is 9.6.

Given:

No. of moles of KOH = 4.3 * 10^-5 moles

Volume of solution = 1L

Molarity = No. of moles / Volume of solution

          M = 4.3 * 10^-5 / 1

          M = 4.3 * 10^-5

p[OH] = -log[OH^-]

p[OH] + p[H] = 14

pH = 14 - pOH

pOH = 14 - pH

14 - pH = -log(4.3 * 10^-5)

14 - pH = 4.3

pH = 14 - 4.3

pH = 9.6

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Plasmas that heat up at the same temperature as their surroundings.

In the substance known as plasma, a large number of electrons are free to move about among the atomic nuclei. The fourth state of matter, after solid, liquid, and gas, has been referred to as plasma. In a sample of matter that is solid, liquid, or gaseous, the electrons typically stick with the same atomic nucleus.

Although plasmas resemble gases, their atoms differ because they are composed of free electrons and ions of an element like neon (Ne). When you look around, you don't come across spontaneously occurring plasmas very frequently. They aren't occurrences that occur frequently on Earth.

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Answer:  Aspirin is used to reduce fever and to relieve mild to moderate pain from headaches, menstrual periods, arthritis, toothaches, and muscle aches.

Explanation:

Aspirin is in a group of medications called salicylates. It works by stopping the production of certain natural substances that cause fever, pain, swelling, and blood clots. Aspirin is also available in combination with other medications such as antacids, pain relievers, and cough and cold medications.

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After heating 57.2 grams of the anhydrous compound remained.

First, we convert 66.4 grams of Ba(ClO₄)₂·3H₂O into moles, using its molar mass:

Molar mass of Ba(ClO₄)₂·3H₂O = Molar mass of Ba(ClO₄)₂ + (Molar Mass of H₂O)*3

Molar mass of Ba(ClO₄)₂·3H₂O = 390.23 g/mol

66.4 g ÷ 390.23 g/mol = 0.170 mol Ba(ClO₄)₂·3H₂O

0.170 moles of Ba(ClO₄)₂·3H₂O would produce 0.170 moles of Ba(ClO₄)₂. Meaning we now convert 0.170 moles of Ba(ClO₄)₂ into grams, using the molar mass of Ba(ClO₄)₂:

0.170 mol * 336.23 g/mol = 57.2 g

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The nonsilicate groups contains minerals that are commonly yellow in color, have a metallic luster, and contain important metal ores.

What are non silicate groups?

Minerals can be categorised as silicate, which means they include silicon and oxygen, or non-silicate, which means they don't. Even though silicate minerals make up the majority of the earth's crust, a number of non-silicate minerals are very significant.

Metallic-looking minerals are opaque, highly reflective, and have a high absorptive index. Galena, pyrite, and other minerals with a metallic lustre are a few examples of native copper, gold, and silver.

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A conductor is distinguished from an insulator with the same number of atoms by the number of nearly free electrons.

Whether an object is made of conductive or nonconductive material affects how it behaves once it has been charged. Electrons can move freely between particles when they are in conductors, which are substances. The charge can be transported across the whole surface of an object constructed of a conducting substance.

A charge is swiftly dispersed across the full surface of the object if it is applied to it at a specific point. The motion of the electrons causes the distribution of charge. A charged object will constantly disperse its charge until the overall repulsive interactions between surplus electrons are minimized because conductors allow electrons to be moved from particle to particle.

Insulators, as opposed to conductors, are substances that prevent electrons from freely moving from one atom or molecule to another.

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The complete question is:

"A conductor is distinguished from an insulator with the same number of atoms by the number of:

A. nearly free atoms

B. electrons

C. nearly free electrons

D. protons

E. molecules"

Answer:

Explanation:

You aren't truly changing your hair, after all. It will regrow, and it is still hair; nothing has changed. Without changing the actual identity, a physical change can modify one or more physical properties. Therefore, getting a haircut  is a physical change

The gas should not subjected to excessive pressure and that fire extinguishers are always handy.

The Haber process is the process that could be used for the production of ammonia gas. The process involves the bringing together of the hydrogen and the oxygen gas under pressure. We know that this reaction is favored when the pressure is increased and the temperature is lowered. The temperature has to be lowered because the process is an exothermic reaction and could only move forward at lower temperature.

The word exothermic means that heat is given out in the process. The heat of the reactants is greater than the heat of the products. We know that risk of explosion is greater for an exothermic gas under pressure.

Given that methane is a highly combustible gas and it is transported under pressure, we must ensure that the gas is not subjected to excessive pressure and that fire extinguishers are always handy.

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The flame test uses the distinctive color that salt gives the flame of a Bunsen burner to help visually identify an unknown metal or metalloid ion. The metal ions become excited atoms due to the flame's heat, and these excited atoms release visible light.

An orange-red flame test color is produced by a sample of an ionic chemical. Find the metal ion that is present. Pour a clean wire loop into a solid sample of the substance being tested to conduct a flame test.

Place the loop into the edge of a Bunsen burner's blue flame.

examine and note the hue of the flame that is produced.

The flame test's colors are a result of the electrons' excitement as a result of the elevated temperature.

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The theoretical yield of SnS₂ will be 4.20 gram can be produced using the following reaction

From the equation of the reaction:

The mole ratio of the reactant is 1:2.

Mole of 35.2 mL, 0.419 M SnBr₄  = 0.419 x 35.2/100 = 0.147 mols

Mole of 51.1 mL, 0.203 M Na₂S = 0.203 x 51.1/1000 = 0.0103 moles

Thus, Na₂S is in excess while SnBr4  is limiting.

Mole ratio of SnBr₄  and SnS₂ = 1:1

Equivalent mole of SnS₂ = 0.023 moles

Mass of 0.023 moles SnS₂ = 0.023 x 182.81 = 4.20 grams

The quantity of a product obtained from a reaction which is expressed in terms of the yield of the reaction. the quantity of product predicted by stoichiometry is called the theoretical yield, whereas the quantity obtained actually is called the actual yield.

A limiting reagent may be a chemical reactant that limits the amount of product that is formed. The limiting reagent gives the littlest yield of product calculated from the reagents (reactants) available. This smallest yield of product is named the theoretical yield.

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The no. of atoms comprise the motif of a fcc orb.

14 unit atoms make up 1 unit cell

256 atoms will make up 256/14 unit cells. = 18 unit cells.

What is an fcc lattice?

In the FCC structure, there are six atoms in the centre of each of the six unit cell faces and eight atoms in each of the unit cell's eight corners. Consequently, 8 + 6 = 14 atoms make up a unit cell.

One of the most typical atomic arrangements in pure solids is the Face-Centered Cubic (FCC) crystal structure. FCC has an APF of 0.74 because it is tightly packed. FCC is also incredibly ductile and has 12 distinct slip systems.

The number of atoms in a face-centered cubic unit cell is four. A line that runs diagonally from a cube's top corner to its bottom corner on the same side of the cube is equivalent to 4r.

14 unit atoms make up 1 unit cell

Thus, 256 atoms will make up 256/14 unit cells. = 18 unit cells.

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Nuclear fission splits an atom apart, while nuclear fusion fuses two atoms together. Option B.

In nuclear fission, a heavy nucleus or atom splits into smaller and lighter nuclei or atoms. Energy is released during this process as well.

In contrast, nuclear fusion has to do with the coming together of 2 or more light nuclei or atoms to form a single heavy nucleus or atom. This process requires that energy is consumed.

Thus, nuclear fission can be thought of as a process that splits an atom apart, while nuclear fusion fuses two atoms together.

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The hydrogens and oxygen of a water molecule are held together by covalent bond

The bond which is formed by mutual sharing of electron called as covalent bond

In water molecule the hydrogens and oxygen are connected with covalent bond means mutually sharing of electron. water molecule consists of two atoms of hydrogen linked by covalent bonds to the same atom of oxygen. atoms of oxygen are electronegative and attract the shared electrons in their covalent bonds.

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Answer:

Acetone will vaporize from the mixture before water.

Explanation:

You have mentioned that the bp of water is 100°C and the bp of acetone is 56°C.We know that in the distillation process of mixture the substance having low bp vaporizes,condenses and gets collected in the separete container before the one having high bp.So the one having high bp remains in the original container and that is water.

Thus, the second option is correct.