Q3. Which of the following
Elements is likely to
form cations?
ง
A. Titanium (T:)
B. Carbon
C. Bromine
(Br)
) (Ar
D. Argon

Answer:

Lead iodide (II) is an inorganic compound, lead salt and hydrogen acid, with the PbI2 formula.

Answer:

Bronsted-Lowry acid and base

Explanation:

The definition of Bronsted-Lowry for a compound is in its ability to deal with any solvent, such as ammonia or sulfuric acid, through acids and bases in pairs, called conjugated acid-base.

A Bronsted-Lowry base is any species capable of accepting a hydrogen proton, which requires a pair of free electrons to form the bond with the H⁺ proton, whereas a Bronsted-Lowry acid is a species capable of donating an H⁺.

Thus, the conjugated base of a Bronsted-Lowry acid is the species formed after that acid donates a proton. The conjugated acid of a Bronsted-Lowry base is the species formed after that base accepts a proton.

The two species in an acid-base conjugate pair have the same molecular formula, except that the acid has an extra H⁺ compared to the conjugated base.

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Answer:

Explanation:

The pH of 0.02 M hydrochloric acid is approximately 1.7.

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Answer:it do not states

Explanation:

First, we have to remember the equation to calculate the heat of evaporation:

Q is the heat, ΔH is the vaporization heat of the substance, and m is the mass.

If we have the vaporation heat in terms of moles (as in this case), we have to multiply it by the number of moles instead of the mass. For that purpose, we have to calculate the molecular weight of the water:

Then, we can pass the grams to moles:

And we can finally calculate the heat:

The answer is that the necessary heat to evaporate the water is 63.9894 kJ approx.

(A) The mass number of the daughter product is 234.

(B) The atomic number of daughter product is 90.

(C) The isotope that remains after the alpha decay is thorium-234.

(D) The mass number of the daughter product is 4 less than the original atom.

(E) The atomic number of the daughter product is 2 less than the original atom.

The alpha decay of Uranium involves the emission of alhpa particles and thorium-234 as daughter product.

\(^{238}_{92}U\ ---- > \ \ ^4_2He \ + \ ^{234}_{90}Th\)

From the equation of alpha decay of Uranium, we can infer the following;

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Yes, we can conclude that a white solid that weighs 105.5 mg and is presumed to be cocaine (C₁₇H₂₁NO₄) produces 279.3 mg of CO2 and 66.46 mg of water upon combustion.

Cocaine is a tropane alkaloid that has both local and central nervous system (CNS) stimulating effects. Cocaine inhibits the re-uptake of dopamine, serotonin, and norepinephrine into pre-synaptic neurons by binding to the transport proteins for these neurotransmitters. The salt form of cocaine is called cocaine hydrochloride. The taste is bitter and numbing, and it is a fine white powder.

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The complete question is -

A 105.5mg sample of a white substance, suspected of being cocaine (C17H21NO4), forms 279.3mg of CO2 and 66.46mg of water on combustion. Chemical analysis shows that the compound contains 4.68% N by mass. Would you conclude that the white solid is cocaine?​

Answer:

Farmers spray to mitigate crop damage caused by pests. A pest is any biological organism, including weeds, pathogens, and arthropods, that interferes with the production of crops affecting quality and/or yield. ... Pesticides work in many different ways by affecting their target, whether it be a weed, pest, or disease.

Explanation:

this is my answer❤︎

Answer:

Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules. ... The fire's heat causes molecules in the pan to vibrate faster, making it hotter. These vibrating molecules collide with their neighboring molecules, making them also vibrate faster.

Explanation:

0.009709 moles

According to Avogadro's constant;

Given the following parameters

Hence the required moles of copper is 0.009709 moles

The standard reduction potential of the Cr³+/Cr electrode is -0.46V. None of the option is correct.

To determine the standard reduction potential of the Cr³+/Cr electrode, we can use the Nernst equation, which relates the standard reduction potential to the cell potential under non-standard conditions. The Nernst equation is given by:

E = E° - (0.0592/n) * log(Q)

where E is the cell potential, E° is the standard reduction potential, n is the number of electrons transferred in the half-reaction, and Q is the reaction quotient.

In this case, we have the standard potential of the cell as −0.60V. We know that the standard reduction potential of the Sn/Sn²+ electrode is -0.14V. Therefore, the reduction potential of the Cr³+/Cr electrode can be calculated as:

E = -0.60V - (-0.14V)

E = -0.60V + 0.14V

E = -0.46V

Therefore, the standard reduction potential of the Cr³+/Cr electrode is -0.46V.

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Answer:

\(^{127}_{53} I\)

53 protons and electrons and 74 neutrons.

Explanation:

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In this case, since the nuclide symbol of an isotope is represented by putting the atomic mass as a prefixed superscript and the number of protons as a prefixed subscript, for I-127 we have:

\(^{127}_{53} I\)

Now we realize this isotope have 53 electrons and protons and the following number of neutrons:

\(neutrons= 127-53=74\)

Notice this isotope has about the same molar mass of the average iodine atom.

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Answer:0.0922 Fahrenheit per minute

Explanation: Temperature change in degree Fahrenheit from Celsius is given by multiplying the change in temperature in celsius by 1.8 and adding 32 to it. Now the temperature you added is in Fahrenheit. But the temperature change is for a day. To convert change in temperature per day to per minute divide the obtained answer in Fahrenheit by 24*60.

Thus,

change in temperature in Fahrenheit: (56*1.8)+32= 132.8 degree Fahrenheit

change in temperature per minute: (132.8)/(24*60)= 0.0922 degree Fahrenheit per minute

Answer: B.) -12.4

Explanation: This is because the sign of heat transfer is determined by the system's perspective. In this case, the system is releasing heat to the surroundings, which means that heat is flowing out of the system, making the heat transfer negative. The magnitude of the heat transfer is 12.4 J.

For 1 mole of S₂O₃²⁻  0.5 mole of S₂O₈²⁻  will be used.

A reaction in which the number of atoms in reactants is equal to the number of atoms in the products is called a balanced reaction.

The reaction given in the question is

S₂O₈²⁻   + 2I⁻      ⇄   2SO₄²⁻ + I₂

I₂ + 2S₂O₃²⁻ ⇄ 2I⁻ + S₄O₆²⁻

Adding the equation will give balance equation

S₂O₈²⁻  + 2I⁻  + 2S₂O₃²⁻   ⇄ 2SO₄²⁻  + 2I⁻ + S₄O₆²⁻

So x moles of S₂O₈²⁻ require 2x of S₂O₃²⁻

for 1 mole of S₂O₃²⁻  0.5 mole of S₂O₈²⁻  will be used.

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Answer:

1. 2K(s) + Cl2(g) → 2KCI(s)

2. 4NH3(g) → 2N2(g) + 6H2(g)

3. 2AgNO3(aq) + CaCl2(aq) → 2AgCl(s) + Ca(NO3)2(aq)

4. CH4(g) + 2O₂(g) → CO2(g) + 2H₂0(g)

The temperature of the gas when the volume increase from 0.67 L to 1.37 L is  471.29 °C.

Temperature is the hotness or coldness of a thing or place.

To calculate the temperature in Celsius when the volume increase, we use the formula below.

Formula:

Where:

From the questuion,

Given:

Substitute these values into equation 1

Hence, the final temperature of the gas is 471.29 °C.

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Answer:

✔ habitat destruction

Explanation:

the 3 reasons are:

hunting

habitat loss

introduced predators

summed up its habitat destruction

Answer:

7.640 kg

Explanation:

Step 1: Write the balanced complete combustion equation for ethanol

C₂H₆O + 3 O₂ ⇒ 2 CO₂ + 3 H₂O

Step 2: Calculate the moles corresponding to 4 kg (4000 g) of C₂H₆O

The molar mass of C₂H₆O is 46.07 g/mol.

4000 g × 1 mol/46.07 g = 86.82 mol

Step 3: Calculate the moles of CO₂ released

86.82 mol C₂H₆O × 2 mol CO₂/1 mol C₂H₆O = 173.6 mol CO₂

Step 4: Calculate the mass corresponding to 173.6 moles of CO₂

The molar mass of CO₂ is 44.01 g/mol.

173.6 mol × 44.01 g/mol = 7640 g = 7.640 kg

Archimedes' principle: Picture yourself in a pool and imagine trying to push a floating ball underwater. Well, Archimedes figured out that when an object is in a fluid (like water), it experiences an upward force called buoyancy. This force is equal to the weight of the fluid that the object displaces. So, if the object is less dense than the fluid, it floats because the buoyant force supports it. But if it's denser, it sinks. Archimedes' principle helps us understand why things float or sink in water!

Bernoulli's principle: Imagine sticking your hand out of the window of a moving car. Have you noticed that when you tilt your hand upward, you feel a lighter pressure on it? Well, that's Bernoulli's principle in action! It tells us that when a fluid (like air or water) moves faster, its pressure decreases. So, when the air above your hand moves faster due to the car's motion, it creates a lower pressure, making your hand feel lighter. This principle helps explain how planes fly, how sprinklers work, and more!

Flow rate equation: Picture a hose with a nozzle. If you partially cover the nozzle with your thumb, the water shoots out faster, right? That's because of the flow rate equation! This equation tells us that when a fluid flows through a pipe or a hose, the product of its velocity and the cross-sectional area of the pipe remains constant. So, when you reduce the area by covering part of the nozzle, the fluid speeds up to keep the flow rate constant. It's like squeezing the hose to make the water come out faster!

Pascal's Principle: Pascal's principle, named after the French mathematician and physicist Blaise Pascal, states that when pressure is applied to a confined fluid, the change in pressure is transmitted equally to all parts of the fluid. In other words, any change in pressure applied to a fluid in an enclosed system is transmitted undiminished to every portion of the fluid and to the walls of the container. This principle forms the basis for various hydraulic systems and is important in understanding the behavior of fluids under pressure.

The statement above aligns with Pascal's principle and therefore option D is correct.

The greater magnetic field will be produced by Electromagnet A, which has an iron core.

This is due to iron's ferromagnetic characteristics.

Magnets do not attract silver.

An electromagnet with an iron core creates a greater magnetic effect, since ferromagnetic materials have the effect of concentrating the magnetic flux.

An electromagnet with a gold, silver, or titanium core would be completely functional, as would one with a wood or human finger core, which does not create magnetic effects. Silver is not magnetic in any way. In reality, in our daily lives, only iron, nickel, cobalt, gadolinium, neodymium, and samarium are magnetic.

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Answer:

"If they produce the same strength magnetic force, then electromagnet A has more turns in the wire."

this is the correct answer trust me

The order of elution in reversed-phase HPLC is different from that in a normal-phase separation, with more polar solutes eluting first. The mobile phase's polarity is increased to produce longer retention periods.

A method in analytical chemistry called high-performance liquid chromatography, formerly known as high-pressure liquid chromatography, is used to separate, recognize, and quantify each component in a mixture.

To obtain a consistent increase in the organic solvent (usually methanol or acetonitrile) over the course of the study, gradients in reversed-phase HPLC typically use on-line (dynamic) mixing of solvents. This increases the elution strength of the eluent over time.

Thus, In contrast to the normal phase HPLC, which employs a polar stationary phase and a less polar mobile phase, the reverse phase HPLC makes use of a nonpolar stationary phase and a polar mobile phase.

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Answer:

Magnesia, or magnesium oxide, is a mineral composed of alkaline earth metals. The majority of today's magnesium oxide comes from calcining natural minerals.

Explanation:

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The volume of argon gas will be, 79.68L .

Mass of argon (Ar) gas = 2.71 g

Molar mass of argon = 39.95 g/mole

Volume of argon gas = 4.21 L

Moles of neon (Ne) gas = 1.29 mole

First we have to calculate the moles of argon gas.

\(Moles of argon = \frac{mass\ of \ar}{molar \mass\ of \ ar}\\ \\Moles of argon = \frac{2.71}{39.95} \\\\Moles of argon = 0.0678 moles\)

Now we have to calculate the volume of neon gas.

According to the Avogadro's law, the volume of gas is directly proportional to the number of moles of gas at same pressure and temperature. That means,

\(\frac{v_1}{v_2} =\frac{n_1}{n_2}\)

where,

\(v_1\) = volume of argon gas

\(v_2\) = volume of argon gas

\(n_1\) = number of moles of argon gas

\(n_2\) = number of moles of argon gas

Now we put all the given values in this formula, we get

\(\frac{4.21}{v_2} = \frac{0.068}{1.29} \\\\v_2 = 79.86 L\)

Therefore, the volume of argon gas will be, 79.68L .

The molar mass of a chemical compound is defined as the mass of a sample of the compound divided by the amount of the substance, which is the number of moles of the sample measured in moles. Molar mass is the volume of a substance, not a molecular property. Molar mass is the average of several occurrences of a compound, whose mass often varies  due to the presence of isotopes. In most cases, molar mass is calculated from  standard atomic masses and is thus a function of the Earth's average and  the relative abundance of the Earth's atomic isotopes. Molar mass is suitable for converting between the mass of a substance and the amount of  substance in bulk.

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Answer:

9.89 x 10²³ molecules H₂S

Explanation:

To find the molecules of H₂S, you need to (1) convert grams S to moles S (via the atomic mass of sulfur), then (2) convert moles S to moles H₂S (via the mole-to-mole ratio from equation coefficients), and then (3) convert moles H₂S to molecules H₂S (via Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value.

Atomic Mass (S): 32.065 g/mol

2 H₂S(s) + SO₂(g) -----> 3 S(s) + 2 H₂O(l)

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

79.0 g S           1 mole            2 moles H₂S          6.022 x 10²³ molecules
---------------  x  ---------------  x  ----------------------  x  -------------------------------------  =
                        32.065 g            3 moles S                          1 mole

=  9.89 x 10²³ molecules H₂S

Answer:

Oxygen reduction reaction

Explanation:

Pt is used as the catalyst for both the hydrogen oxidation reaction (HOR) occurring at the anode and the oxygen reduction reaction (ORR) at the cathode. Usually, the Pt catalyst takes the form of small particles on the surface of somewhat larger carbon particles that act as a support.

At 2861 degree Celsius the iron begins to boil. At 1,538 °C the substance begins to melt.

The melting point is the point at which the liquid and solid forms of a solid can exist in equilibrium. It can also be defined as the point at which a solid changes into a liquid under normal atmospheric pressure.

The equilibrium point at which water vapor, liquid water, and solid ice can exist in equilibrium is the only point at which the pressure and temperature of water vapor are the same. The equilibrium point of water vapor is the point at which the partial vapor pressure is the same as that of liquid water at the exact temperature of 273.1600 K.

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