Malik analyzed three samples to test which element was a metalloid. The table shows his results. A 7-column table with 3 rows. The first column titled element has entries A, B, C. The second column titled lustrous has entries yes, no, yes. The third column titled brittle has entries no, yes, yes. The fourth column titled how it reacts has entries base, acid, acid or base. The fifth column titled boiling point (degrees C) has entries not observed, negative 34. 04, not observed. The sixth column titled melting point (degrees C) has entries 97. 72, not observed, 1413. 85. The seventh column titled electrical conductivity has entries high, very low, medium. Which element (A, B, or C) is most likely a metalloid?.

Answer:

Since it has 2 valence electrons

Explanation:

The elements would most likely attain a noble-gas configuration of He, Ne, Ar, or Kr. The appropriate elements for their respective bins are Se would gain two electrons to attain a noble-gas configuration of Kr. Sr would lose two electrons to attain a noble-gas configuration of Kr.

Noble gases are the most stable elements because their outermost electron shells are fully occupied, which is what the other elements aim to achieve. Noble gas configuration is the electron configuration of noble gases, which are the most stable elements. The electron configuration of the nearest noble gas is achieved by adding or removing electrons from the atom. Each of the seven periods in the periodic table corresponds to a specific block of the periodic table. The 1s block is called the first period, the 2s2p block is the second period, and so on.

The elements Li, Al, O, P, K, Se, and Sr belong to different blocks of the periodic table, so they each have different electron configurations.

The electron configurations of Li, Al, O, P, K, Se, and Sr are 1s2 2s1, [Ne] 3s2 3p1, [He] 2s2 2p4, [Ne] 3s2 3p3, [Ar] 4s1, [Ar] 3d10 4s2 4p4, and [Kr] 5s2, respectively.

To achieve a noble-gas configuration, these elements would lose or gain electrons as follows: Li would lose one electron to attain a noble-gas configuration of He. Al would lose three electrons to attain a noble-gas configuration of Ne. O would gain two electrons to attain a noble-gas configuration of Ne.

P would gain three electrons to attain a noble-gas configuration of Ar. K would lose one electron to attain a noble-gas configuration of Kr.

Se would gain two electrons to attain a noble-gas configuration of Kr. Sr would lose two electrons to attain a noble-gas configuration of Kr.

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Answer:

i bought it cuz i need a cup?

Explanation:

Answer:

Best chemistry ever tho

Explanation:

LOL

Answer:

Exosphere

Explanation:

it is found at the end reaching outer space

The free energy of the water is obtained as 90.7 kJ/mol. Option D

We have to note that the Hess law of the constant heat summation is the law that we can be able to use in this case so as to be able to obtain the standard free energy of the formation of the water.

We have to keep in mind that the standard free energy of the reaction can be obtained by;

Standard free energy of reaction = Standard free energy of product - Standard free energy of the reactants

Thus;

Let the standard free energy of water be X

-957.9  = [4( 86.71 ) + 6X] - [4(-16.66) + 5(0)]

957.9  =  (346.84 + 6X) - (-66.64)

957.9  = 280.2 + 6X

X =  90.7 kJ/mol

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Answer: 157.8 g

Explanation: I hope this help my child UwU

What is the weight of the ethyl alcohol that exactly fills a 200.0 mL container the density of ethyl alcohol is 0.789 g ml?

Density review

A

B

What is the weight of the ethyl alcohol that exactly fills a 200.0 mL container? The density of ethyl alcohol is 0.789 g/mL.

g = (0.789 g/mL) (200.0 mL) = 158 g

Answer:

\(\boxed {\tt 197.25 \ grams }\)

Explanation:

The density formula is:

\(d=\frac{m}{v}\)

Rearrange the formula for m, the mass. Multiply both sides of the equation by v.

\(d*v=\frac{m}{v} *v\)

\(d*v=m\)

Mass can be found by multiplying the density and volume. The density of ethyl alcohol is 0.789 grams per milliliter. The alcohol fills a 250 milliliter graduated cylinder, so the volume is 250 milliliters.

\(d= 0.789 \ g/mL \\v= 250 mL\)

Substitute the values into the formula.

\(0.789 \ g/mL * 250 \ mL=m\)

Multiply. Note that the milliliters, or mL will cancel each other out.

\(0.789 \ g * 250=m\)

\(197.25 \ g=m\)

The mass of the ethyl alcohol is 197.25 grams.

Answer: Most are solid at room temperature (25 degrees Celsius) except mercury

Explanation:

Sun (radiation), winds (eolic) and water (hydraulic) are all sources of energy that work together during rock formation.

The rock formation is a very slow process that occurs at a geological time, which may take millions of years.

During this period, rocks are shaped by different types of energy, especially radiation and erosion (wind and water bodies)

In conclusion, the sun (radiation), winds (eolic) and water (hydraulic) work together during rock formation.

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Answer:

human-F

chicken-D

rabbit-E

tortoise-C

salamander-B

fish-A

Explanation:

hope this helped!!

I tried my best!!

please mark me as brainliest

HAVE A GREAT DAY <3

Answer:

D Tortoise

B Salamander

A Fish

C Chicken

F Human

E Rabbits

Explanation:

I Really have an Explanation

Answer:

C

Explanation:

All three can become negative versions: negative ions

Answer:

It is going to be D because Group 1 A and 2 A are s block elements which are METALS, also they are not halogens as the 7 A group is called halogens, Plus they give +1 oxidation state so Correct answer is D as they are group 1 A elements so they have only one valence electron in their valence shell

The energy transformation is, Electrical to light. The answer is C.

When a battery-powered flashlight is turned on, electrical energy from the battery is transformed into light energy through a process called electroluminescence. Inside the flashlight, a circuit is completed when the switch is turned on, allowing electrical current to flow from the battery through a wire to a light bulb or LED (light-emitting diode). The electrical energy is converted into light energy, which illuminates the area around the flashlight.

The battery's chemical energy is not directly transformed into light, but rather is used to generate electrical energy that is then transformed into light. Hence option C is correct.

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--The complete question is, When a battery-powered flashlight is turned on, what type of energy transformation takes place?

A. Chemical to thermal

B. Electrical to thermal

C. Electrical to light

D. Chemical to light--

We may include hydrogen-bonding as one type as it is a particular instance of dipole-dipole interaction. The London dispersion forces are the other sort of interaction.

Hydrogen bonds form between nearby hydrogen and oxygen atoms of adjacent water molecules in the case of water. A bond called a hydrogen bond is produced by the attraction between individual water molecules.

Hydrogen bonding is the strongest of all the intermolecular forces that are present in water. If it is compared to the London Dispersion Force and dipole-dipole attraction, it is the strongest intermolecular force of attraction.

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Sunflower oil can be seperated easily by decentation process.

What is decentation process?

Decantation is the process of removing the liquid layer at the top from the layer of solid or liquid below to separate liquid from solid and other immiscible (non-mixing) liquids. After pouring out the top layer, the mixture can be tilted to complete the process.

As an illustration, when water and oil are combined in a beaker, a distinct layer between the two liquids eventually forms, with the oil layer floating on top of the water layer.

Therefore, Sunflower oil can be seperated easily by decentation process.

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When we add the two reactions X and Y as shown, we obtain the reaction Z; 2CH4(g) +3O2(g) + O2(g)  →  4H2O(g) + 2CO2(g)

From the full question, we can see that reaction X is given as;

2CH4(g) +3O2(g) →2CO(g) + 4H2O(g)

Reaction Y is given as;

2CO(g) + O2(g) → 2CO2(g)

If we add the two reactions together, we have;

2CH4(g) +3O2(g) + 2CO(g) + O2(g)  → 2CO(g) + 4H2O(g) + 2CO2(g)

We now have to cancel out  2CO(g) on both sides of the reaction equation;

2CH4(g) +3O2(g) + O2(g)  →  4H2O(g) + 2CO2(g)

Hence the reaction Z is 2CH4(g) +3O2(g) + O2(g)  →  4H2O(g) + 2CO2(g)

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The given compounds are Enantiomers

Enantiomers are the chemicals that make up the given pair. One of the two stereoisomers is a mirror image of the other but cannot be superposed, much as how one's left and right hands are mirror images of one another but cannot appear identical only by being reoriented. When a chemical has a single chiral atom or another comparable structural feature, it can have two possible structures that are non-superposable and mirror images of one another.

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Answer: Exothermic reactions are reactions or processes that release energy, usually in the form of heat or light.

Explanation: In an exothermic reaction, energy is released because the total energy of the products is less than the total energy of the reactants.

The volume of nitrogen gas required to produce 75.0 g of lithium nitride at a pressure of 2 atm and a temperature of 175 °C is 19.7 L.

Lithium metal reacts with nitrogen gas to produce lithium nitride. Weight of lithium nitride produced = 75.0 g, Pressure of nitrogen gas, P = 2 ATM, Temperature of nitrogen gas T = 175 °C.

We need to find the volume of nitrogen gas required to produce lithium nitride. To solve the problem, we will use the following steps:

Conversion of pressure and temperature to SI units

The given pressure is 2 atm.1 atm = 101325 Pa2 atm = 2 × 101325 Pa = 202650 Pa

The given temperature is 175 °C = 448 K2.

Calculation of number of moles of lithium nitride produced

Molar mass of lithium nitride, Li₃N = (3 × 6.94) + 14.01 = 34.83 g/mol

Number of moles of Li₃N produced = mass / molar mass= 75.0 / 34.83= 2.1529 moles3.

Calculation of number of moles of nitrogen gas required, We know from the balanced chemical equation:

6 Li + N₂ → 2 Li₃N

This equation shows that 6 moles of Li react with 1 mole of N₂ to produce 2 moles of Li₃N.

So, the number of moles of N₂ required to produce 2.1529 moles of Li₃N= 1 × (2.1529 / 2) = 1.0765 moles4.

Calculation of volume of nitrogen gas required

Using the ideal gas equation, PV = nRT

where P is the pressure in Pa, V is the volume in meter cubed, n is the number of moles, R is the gas constant = 8.31 J/mol K, and T is the temperature in Kelvin.

Substituting the given values, we get:

V = nRT / P= (1.0765 × 8.31 × 448) / 202650= 0.0197 m³= 19.7 L.

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Chromatography is a physical method used to separate and analyze simple, complex and viscous mixtures, as well as metals.

Viscous Mixtures are mixtures consisting of two or more components that do not mix together but form a suspension. This suspension is a combination of a solid and a liquid, or two liquids that do not mix. The solid and liquid components are usually suspended in a liquid carrier, such as water or oil. The solid particles settle out of the mixture over time, while the liquid components remain in suspension due to the viscosity of the carrier liquid and the size of the particles.

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The mole ratio of NH3 to H2 is 2:3.

Mole ratio is a term used in chemistry to describe the relative amounts of two or more substances involved in a chemical reaction. It refers to the ratio of the number of moles of one substance to the number of moles of another substance in a chemical reaction.

The mole ratio of NH3 to H2 in the chemical reaction where NH3 and H2 react to form NH3 is:

N2 + 3H2 -> 2NH3

The balanced equation shows that one molecule of N2 reacts with three molecules of H2 to produce two molecules of NH3. Therefore, the mole ratio of NH3 to H2 is 2:3.

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The Correct label for the following anatomical features of fluid exchange between lymphatic and circulatory systems are shown in the diagram.

The circulatory and lymphatic systems each consist of a sizable network of vessels that hold fluid. The pulmonary circuit's main job is to move deoxygenated blood to the lungs, where it can take in oxygen and expel carbon dioxide. The lymph trunk is a group of lymphatic vessels that transport lymph and is created by the union of several efferent lymphatic vessels. The systemic circuit is the route taken by blood as it travels from the heart to the rest of the body (excluding the lungs).A pair of big veins on either side of the body, known as the subclavian veins, are in charge of draining blood from the upper extremities so that it can return to the heart. The right atrium of the heart receives deoxygenated blood from the systemic circulation via the superior vena cava (SVC), the larger of the two venae cavae. In every cell compartment throughout the body, there are microscopic, thin-walled lymphatic capillaries that are closed at one end. Nephrons are physically connected to a minor calyx or the renal pelvis by a network of tubules and ducts that make up the kidney's collecting duct system. Smooth muscle cells (SMCs), which have inherent contractile activity and cover collecting capillaries, ensure lymph propulsion. A lymph node, sometimes known as a lymph gland, is a kidney-shaped lymphatic and immune system component.

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Correctly label the following anatomical features of fluid exchange between lymphatic and circulatory systems.

Answer:

J/gm-C

Explanation:

J/gm-C   is one set of units for specific heat

The balanced equation of the redox reaction using the ion-electron method is:

3 Hg + 8 HNO₃ → 3 Hg(NO₃)₂ + 2 NO + 4 H₂O

The correct option is D.

Redox reactions include a change in the oxidation state of the substrate. When oxidation occurs, electrons are lost, or the oxidation state increases. When a reduction occurs, electrons are gained or the oxidation state decreases.

The balanced equation of the redox reaction using the ion-electron method is given below as follows:

Hg + HNO₃ → Hg(NO₃)₂ + NO + H₂O

Hg⁰ is oxidized to Hg²⁺ by the loss of two electrons

N⁵⁺ is reduced to N²⁺ by a gain of three electrons

To balance electron loss, we add a coefficient of 3 in from of Hg and a coefficient of 8 in front of HNO₃

3 Hg + 8 HNO₃ → 3 Hg(NO₃)₂ + 2 NO + 4 H₂O

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The percent ionization of a 0.331M solution of HCN is found to be 0.00337%.  The pH of the solution is  4.953. The correct option is E. 4.953.

To solve this problem, we need to use the equation for percent ionization:

% ionization = (concentration of ionized acid / initial concentration of acid) x 100%

We can rearrange this equation to solve for the concentration of ionized acid:

concentration of ionized acid = % ionization / 100% x initial concentration of acid

Plugging in the given values, we get:

concentration of ionized acid = 0.00337 / 100 x 0.331 = 0.000011187 M

Now, we can use the equation for the ionization of HCN to set up an expression for the equilibrium constant (Ka):

HCN + H2O ↔ H3O+ + CN-

Ka = [H3O+][CN-] / [HCN]

We can assume that the concentration of H3O+ is equal to the concentration of ionized acid, since the ionization of HCN produces one H3O+ ion for every HCN molecule that ionizes. We can also assume that the concentration of CN- is equal to the concentration of H3O+.

Therefore:

Ka = (concentration of ionized acid)^2 / (initial concentration of acid - concentration of ionized acid)

Plugging in the values we calculated, we get:

Ka = (0.000011187)^2 / (0.331 - 0.000011187) = 6.2 x 10^-10

Now, we can use the equation for the pH of a weak acid:

pH = pKa + log([A-] / [HA])

Since we assumed that the concentration of CN- is equal to the concentration of ionized acid, we can substitute [CN-] for [A-] and [HCN] - [CN-] for [HA]. We also know that pKa = -log(Ka).

Therefore:

pH = -log(6.2 x 10^-10) + log(0.000011187 / (0.331 - 0.000011187)) = 4.953

Therefore, the pH of the solution is e. 4.953.

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Answer:

how are you doing, please kindly help me with my homework

When propanoic acid reacts with isopropyl alcohol in the presence of heat and an acid catalyst, the ester formed is isopropyl propanoate.

This reaction is a condensation reaction, which involves the loss of a water molecule. Esters are organic compounds formed by the reaction between carboxylic acids and alcohols in the presence of an acid catalyst.

The reaction is called an esterification reaction, and it produces an ester and water. In this reaction, propanoic acid reacts with isopropyl alcohol to produce isopropyl propanoate.

The chemical reaction can be represented as follows:

CH3CH2COOH + (CH3)2CHOH → CH3CH2COO(CH3)2 + H2O

The acid catalyst used in the reaction is usually concentrated sulfuric acid, which speeds up the reaction by removing water as it is formed.

The ester is characterized by a fruity odour, which is why esters are often used in perfumes and flavorings.

The reaction is reversible, and it reaches an equilibrium point where the forward and backward reaction rates are equal. To drive the reaction forward, excess alcohol is often used.

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The illustration of Thomson's atom represents a neutral atom. In this case, the total amount of positive charge and the total amount of negative charge must be equal. This means that there are equal numbers of protons and electrons in the atom. This is what makes the atom neutral.

A neutral atom is an atom that has no electrical charge. An atom is neutral because it has the same amount of positively charged protons and negatively charged electrons. The nucleus of an atom contains protons, which are positively charged particles. Electrons, which are negatively charged particles, are located in the atom's electron cloud around the nucleus.

Electrons, protons, and neutrons are the three components of atoms. Electrons are negatively charged, protons are positively charged, and neutrons have no charge. Electrons are found outside the nucleus of the atom and are continually moving at high speeds.

In summary, if the illustration of Thomson's atom represents a neutral atom, then the total amount of positive charge and the total amount of negative charge must be equal. This means that there are equal numbers of protons and electrons in the atom. This is what makes the atom neutral.

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Answer:

Quadrilateral because there is no parallel and equal

The ΔGr0 of the reaction is -1401.8 kJ/mol. The reaction is spontaneous at standard temperature because the ΔGr0 value is negative.
To calculate the ΔGr0 of the reaction, we need to use the standard Gibbs free energy of formation (ΔGf0)

Let's break down the calculation step-by-step:

1. Identify the compounds involved in the reaction and their ΔGf0 values.
  - HCl(aq): -95.3 kJ/mol
  - Ca(OH)2(s): -986.1 kJ/mol
  - CaCl2(s): -795.6 kJ/mol
  - H2O(l): -237.2 kJ/mol

2. Calculate the ΔGr0 of the reaction using the formula:
  ΔGr0 = ΣnΔGf0(products) - ΣnΔGf0(reactants)

  In this case, we have:
  ΔGr0 = (1 mol CaCl2 × -795.6 kJ/mol) + (2 mol H2O × -237.2 kJ/mol)
        - (2 mol HCl × -95.3 kJ/mol) - (1 mol Ca(OH)2 × -986.1 kJ/mol)

  ΔGr0 = -1592.4 kJ/mol - (-190.6 kJ/mol) = -1401.8 kJ/mol

Now, to determine if the reaction is spontaneous at standard temperature or not, we consider the sign of ΔGr0.

If ΔGr0 is negative, the reaction is spontaneous.
If ΔGr0 is positive, the reaction is non-spontaneous.
If ΔGr0 is zero, the reaction is at equilibrium.

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