if you put a scale in an elevator and weigh yourself as you ascend and descend does the scale have the same reading in both

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

Answer: Easily recognized and are still alive today

Explanation:

The specific set of traits that may index fossils possess are as follows:

An index fossil may be defined as a type of fossil which is significantly utilized in order to define and identify geologic periods. Such fossils are dead and organic remains of past organisms that were preserved and buried deep into the soil millions of years ago.

Index fossils are those fossils that are remarkably utilized in order to demonstrate the dating of rocks.

Apart from the above-mentioned traits, index fossils may also possess some traits like they are distinctive, widespread, abundant in nature, limited in the geologic time period, etc.

Therefore, the specific set of traits that may index fossils possesses is well-mentioned above.

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The correct option for the process used to refine aluminum from its bauxite ore is option D.

D. Smelting

The reason why smelting is the correct choice is as follows;

Bauxite is the aluminum ore from which alumina, also known as aluminum

oxide, Al₂O₃, is produced. Bauxite is extracted from the topsoil regions of

some subtropical and tropical regions, and the Bayer process is primarily

then used to produce alumina from the bauxite.

Aluminum is produced from the alumina by an aluminum smelting process

known as the Hall—Heroult electrolytic process which involves the use of a

carbon anode and direct current to produce aluminum by reducing the

aluminum oxide

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Answer:

3.8775 kJ

Explanation:

The formula is Q=mcdeltat

We know m (mass) is 150, c (specific heat) is 0.235, and delta t (change in temperature) is 135-25=110

Plug that in and solve for Q

150*0.235*110=3877.5 J

The problem is that this is still in joules so we have to convert to kilojoules

3877.5 J * 1 kJ/1000 J = 3.8775 kJ

The addition of HCl to the reaction mixture would alter the chemical equilibrium and shift the reaction towards the formation of aluminum hydroxide.

If HCl (hydrochloric acid) is added to the reaction mixture from the previous question, it would react with the NaAl(OH)4 (sodium tetrahydroxoaluminate) present in the mixture. The balanced chemical equation for this reaction would be:

HCl(aq) + NaAl(OH)4(aq) → Al(OH)3(s) + NaCl(aq) + H2O(l)

Here, the HCl would donate a proton to the NaAl(OH)4, resulting in the formation of Al(OH)3 (aluminum hydroxide), NaCl (sodium chloride), and H2O (water). This would be an acid-base reaction where HCl acts as an acid and NaAl(OH)4 acts as a base.

Since aluminum hydroxide is an insoluble solid, it would precipitate out of the solution as a white solid. This would be observed as a white cloudy appearance in the reaction mixture. Additionally, the solution would become more acidic due to the addition of HCl.

The presence of excess HCl in the solution could also lead to the dissolution of some of the aluminum hydroxide precipitate, resulting in a clearer solution.

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The mass number of the daughter atom formed from the alpha decay of a certain radioactive atom that has 90 protons and 142 neutrons is 228.

Alpha decay of a radioactive material is the release of an alpha particle that posseses mass number of 4 and atomic number of 2.

According to this question, a certain radioactive atom that has 90 protons and 142 neutron undergoes alpha decay. This means that the mass number of the daughter atom will be as follows:

Mass number of radioactive atom = 142 + 90 = 232

Mass number of daughter atom = 232 - 4 = 228

Therefore, the mass number of the daughter atom formed from the alpha decay of a certain radioactive atom that has 90 protons and 142 neutrons is 228.

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Answer:

Molar mass of gas = 160 g/mol

Explanation:

Given data:

Mass of sample gas = 1.28 g

Temperature of sample gas = 127°C (127+273 = 400K)

Pressure of sample gas = 1 atm

Volume of sample gas = 0.250 L

Molar mass of gas = ?

Solution:

Formula:

PV = nRT

R = general gas constant = 0.0821 atm.L/ mol.K

Now we will put the values in formula.

1 atm × 0.250 L = n × 0.0821 atm.L/ mol.K ×400K

0.250 L.atm   = n ×32.84atm.L/ mol

n = 0.250 L.atm/32.84atm.L/ mol

n = 0.008 mol

Molar mass of gas:

Number of moles = Mass/molar mass

0.008 mol = 1.28 g / molar mass

Molar mass = 1.28 g / 0.008 mol

Molar mass = 160 g/mol

Answer:

Half life is 46 days

Explanation:

The half life of a radioactive substance can be predicted by:

Nt = No(1/2)^(t/th)

Nt is the amount remaining (mg)

No is the initial amount (mg)

t is the time elapsed, in days

th is the half life in days.

Nt = No(1/2)^(t/th)

0.50mg = (8.0mg)(1/2)^(184 days/th)

Using logs, we can solve this for th

th = 46 days

Signals you would expect to observe as the parent peak in the mass spectrum of meldonium, the compound associated with tennis superstar Maria Sharapova's athletic doping incident is 147. The correct answer is A.

Meldonium is a small molecule with a molecular weight of 146.19 g/mol. The parent peak in the mass spectrum of meldonium is therefore expected to be at m/z = 147.

This is because the parent peak represents the molecular ion, which is the intact molecule with all of its electrons stripped away. The mass of the molecular ion is equal to the molecular weight of the molecule.

The mass spectrum of meldonium also shows a number of fragment ions, which are created when the molecular ion breaks apart. These fragment ions can be used to identify the molecule and to determine its structure.

The mass spectrum of meldonium is a valuable tool for the identification and analysis of this drug. It can be used to detect meldonium in urine, blood, and other biological samples. The mass spectrum can also be used to determine the concentration of meldonium in a sample.

Meldonium is a banned substance in sports. Athletes who test positive for meldonium can be suspended from competition. The mass spectrum of meldonium can be used to detect this drug in athletes and to ensure that they are competing fairly.

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Answer:

yes so for example one

Explanation:

yeah so

Answer: In the given reaction:

Cl⁻ + H₃O⁺ ⇋ H₂O⁻ + HCl

Acid: H₃O⁺ (hydronium ion)

Base: Cl⁻ (chloride ion)

Conjugate acid: H₂O⁻ (hydroxide ion)

Conjugate base: HCl (hydrochloric acid)

In this reaction, H₃O⁺ acts as an acid because it donates a proton (H⁺ ion) to Cl⁻, which acts as a base. After the proton transfer, H₃O⁺ becomes its conjugate base, H₂O⁻, and Cl⁻ becomes its conjugate acid, HCl.

Answer:

Polar covalent bond

Explanation:

When the electronegativity difference between two elements A and X is 0.8, the bond AX formed will most likely be a polar covalent bond.

A polar covalent bond is one whose electronegativity difference is between 0.5 and 2.1.

In such a bond type, we have heteronuclear species with one of the species having a higher electronegativity value.

The molarity of the solution : 1.2 M

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

\(\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}\)

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

mass of NaCl=35 g

Volume of solution = 0.5 L

mol NaCl(MW=58.44 g/mol) :

\(\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{35}{58.44}\\\\mol=0.6\)

The molarity :

\(\tt M=\dfrac{0.6}{0.5}=1.2\)

The moles of KMnO₄ needed to form 0.886 moles of carbon dioxide is 2.42 moles.

Balanced chemical reaction

14KMnO₄ + 4C₃H₅(OH)₃ → 7K₂CO₃ + 7Mn₂O₃ + 5CO₂ + 16H₂O.

Given the question:

n(CO₂) = 0.886 mol

From the chemical reaction:  n(CO₂) : n(KMnO₄) = 5 : 14

n(KMnO₄) = [n(CO₂) x 14] ÷ 5

n(KMnO₄) = [0.866 mol x 14] ÷ 5

n(KMnO₄) = 12.124 ÷ 5

n(KMnO₄) =2.42 mol

So, moles of KMnO₄ are consumed to form 0.886 moles of carbon dioxide is 2.42 mol.

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ANSWER

The addition of HCl will shift to reactants

EXPLANATION

When some strong acid is added to a buffer, the equilibrium is shifted to the left, and the hydrogen ion concentration increases by less than expected for the amount of strong acid added. Buffer solution helps in adjusting the pH of a substance.

Since the HCl is a strong acid, it will shift to the left (reactant sides)

Answer:

hex-

Explanation:

Prefix Prefix meaning Sample word

hex-           6                                  hexapod: having six legs, an insect, for      

                                                                   example.

Answer:

Hex-

Explanation:

Synthesis reaction

It is a reaction in which 2 or more reactants combine with each other to form one product .

Check option C

Sulphate and water are combining to form sulfuric acid .

Hence option C is correct

Answer:

SO3 + H2O => H2SO4

Explanation:

I took the test :)

Answer:

Synthesis Reaction

General Formulas and Concepts:

Synthesis Reactions: A + B → AB

Decomposition Reactions: AB → A + B

Single-Replacement Reactions: A + BC → AB + C

Double-Replacement Reactions: AB + CD → AD + BC

Explanation:

Step 1: RxN

3C (s) + 4H₂ (g) → C₃H₈ (s)

With the production of Jacopo Peri's mostly forgotten Dafne in Florence in 1598, opera began in Italy at the end of the 16th century.

Particularly from Claudio Monteverdi's L'Orfeo and quickly spread throughout Europe: Jean-Baptiste Lully in France, Henry Purcell in England, and Heinrich Schütz in Germany

The first nation where opera gained popularity was Italy. Claudio Monteverdi and Jacopo Peri called it home. This exciting form of entertainment eventually spread throughout the remainder of Europe. Italy, France, and Germany are the primary producers of opera.

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Answer:

To get the answer, you want to look at the balanced equation and note that 2 moles of aluminum (Al) can produce 1 mole of aluminum oxide (Al2O3). That's the critical relationship that exists.

\(\huge\mathfrak{Solution :- }\)

★ Molecular weight of Calcium carbonate (CaCO)

=> 40+12+(16×3)

=> 100 g

Given,

Weight : 25g

Therefore,

Number of Moles

★Hence, O.25 moles of calcium carbonate used.

Explanation:

No observable change because nitrogen is an inert gas...

The effect on pressure if the volume of a gas sample doubles yet the temperature of the sample decreases by half is \(P_{Final} = 1/4\ P_{Initial}\), option A.

In the physical sciences, pressure is defined as the perpendicular force per unit area or the stress at a point within a confined fluid. A 42-pound box with a base area of 84 square inches will force tension on a surface equivalent to the power partitioned by the area it is applied to, or a portion of a pound for every square inch.

The weight of the atmosphere pressing down on each unit area of the Earth's surface is referred to as atmospheric pressure, and it is approximately 15 pounds per square inch at sea level. In SI units, pressure is expressed in Pascals; One newton per square meter is equivalent to one pascal. There is nearly 100,000 pascals of atmospheric pressure here.

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Complete question:

What is the effect on pressure if the volume of a gas sample doubles yet the temperature of the sample decreases by half?

The researcher used a stratified sample, which is likely to yield a representative sample by including both genders.

In this study, the medical researcher has employed a combination of sampling methods. For the selection of the 100 males and 100 females, a stratified sample has been used.

This method involves dividing the population into homogeneous subgroups (in this case, males and females) and randomly selecting participants from each subgroup. By using a stratified sample, the researcher ensures representation from both genders, which is likely to yield a more representative sample.

However, the specific sampling method used within each gender group is not mentioned. If the researcher employed a simple random sample within each gender group, it would involve randomly selecting participants from the entire population of males and females, respectively.

This would further enhance the representativeness of the sample, as each individual would have an equal chance of being selected.

It is crucial to note that the information provided does not specify the sampling method for selecting the participants. Therefore, it is challenging to determine whether convenience sampling, systematic sampling, or cluster sampling was employed.

However, these methods are generally considered less representative than simple random sampling or stratified sampling, as they may introduce bias by limiting the inclusion of certain individuals or groups.

In summary, the stratified sampling approach used to select 100 males and 100 females suggests an attempt to obtain a representative sample.

However, without further information on the specific sampling methods employed within each gender group, it is difficult to determine the overall representativeness or potential biases of the sample.

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Answer:

Moving water helps plant's and islands form and grow. Which shapes earth.

Answer:

Soda and wine is the answer to your question.

Explanation:

yo make salt you need a base and an acid. in this case the base is soda and the wine is acid. hope that helps :)