what did you include in your response?
check all that apply ​

Answer:

Its B all the others arent true and also dont make any sense

Explanation:

Sodium has a lower ionization energy than magnesium describes why sodium reacts vigorously than magnesium chloride.

Therefore, sodium is more reactive than magnesium chloride because of lower ionization energy.

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Answer:

There is at least 2 ways. First, the isotopes are allowed to heat water into steam, and the steam turns a generator. 2nd, the isotopes are allowed to heat one end of a "thermopile", and the thermopile powers electronics

Hope this helped you!

Answer:

High explosives do not need to be contained to make their bang. Nitroglycerine, trinitrotoluene, and RDX are high explosives.

Explanation:

The coefficient for the hydrogen sulfate ion (HSO4-) in the balanced redox equation is 12.

The smallest whole number coefficient for hydrogen sulfate is 6

To find the coefficient for the hydrogen sulfate ion in the balanced redox equation, follow these steps:

1. Assign oxidation numbers to all elements in the equation.
2. Identify the elements that undergo changes in oxidation states and determine the increase or decrease in oxidation numbers.
3. Balance the redox reaction using the half-reaction method.
4. Combine the balanced half-reactions to obtain the balanced redox equation.

Step 1: Assign oxidation numbers
Al: 0, H: +1, S: +6, O in HSO4–: -2, O in OH–: -2, Al in Al2O3: +3, O in Al2O3: -2, S in S2-: -2, O in H2O: -2

Step 2: Identify changes in oxidation states
Al (0 to +3), S (+6 to -2)

Step 3: Balance the half-reactions
Oxidation half-reaction (Al to Al2O3): 2Al → Al2O3 + 6e-
Reduction half-reaction (HSO4- to S2-): 8e- + 4HSO4- → 2S2- + 4H2O + 4OH-

Step 4: Combine the balanced half-reactions
Multiply the oxidation half-reaction by 4 and the reduction half-reaction by 3 to equalize the number of electrons exchanged. Then add them together and cancel out the common terms:

8Al + 12HSO4- + 12OH- → 4Al2O3 + 6S2- + 12H2O

The coefficient for the hydrogen sulfate ion (HSO4-) in the balanced redox equation is 12.

By dividing the equation by 2 we will get; 4Al + 6HSO4- + 6OH- → 2Al2O3 + 3S2- + 6H2O.

The smallest whole number coefficient for hydrogen sulfate is 6

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The mass of the sample of the material is 0.1664 g.

The amount of energy needed to raise the temperature of one gram of a substance by one degree Celsius.

By the formula of specific heat

\(Q = mc \Delta T\)

Given, that the specific heat (c) of material is 0.416 J/gC

The difference in temperatures is 30°C to 50°C

The mass=?

Q = heat, 50 J

Putting the values in the equation

\(\rm 50\;J = m \times 0.416 J/g^\circ C \times (50 - 30)\\\\m = \dfrac{0.416 J/g^\circ C \times 20}{50} = 0.1664 g\)

Thus, the mass of the samples is 0.166 g.

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The rate law for a reaction is expressed as:
Rate = k[A]^m[B]^n
Where k is the rate constant, [A] and [B] are the concentrations of the reactants A and B, and m and n are their respective reaction orders.                                                                                                                                                                      

The rate law for the given reaction can be determined by analyzing the changes in concentration of the reactants and products over time. Based on the stoichiometry of the reaction, we can write the rate expression as: Rate = k [a]^x [b]^y [c]^z, where k is the rate constant, x, y, and z are the orders of the reaction with respect to a, b, and c, respectively. To determine the values of x, y, and z, we need to conduct experiments by varying the initial concentrations of each reactant and measuring the corresponding rates of reaction.                                                                                                             By comparing the rate data obtained from these experiments, we can obtain the values of x, y, and z and thus derive the rate law for the given reaction.
To determine the rate law for the given reaction, we need the concentration and rate data for each reactant. The overall order of the reaction is the sum of m and n.

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The results will be biased toward less photosynthesis if there is less carbon dioxide influx in one compartment than in the other chamber. The correct answer is C.

When the airflow in one chamber is less than the other chamber, less CO2 enters the chamber, resulting in a lower CO2 emission level from that chamber.

This may distort the data collected from this camera and lead to inaccurate measurements and conclusions. It is important to ensure that all chambers receive the same amount of air for accurate readings.

To avoid these errors it is important to ensure that all chambers are supplied with the same amount of air. This can be achieved by using the same flow rate for all chambers or by using a flow meter to measure and control the air flow entering each chamber. Consistent and controlled conditions allow researchers to obtain the accurate and reliable data needed to inform scientific conclusions.

The amount of CO2 entering one chamber is reduced when that chamber receives less outside air than the other chamber, resulting in a lower carbon dioxide emission level from that chamber. This can distort the data from that camera and lead to questionable observations and conclusions. It is important to ensure that the air entering each chamber is uniform in order to obtain accurate measurements. To avoid this mistake, it is important to ensure that the airflow to each chamber is uniform. This can be done in one of two ways: maintaining a constant flow rate within each chamber or using a flow meter to control and manage the airflow.

Complete Question:

Recall that your chambers had a set amount of CO 2 entering each chamber and then you measured how much CO 2 was exiting the chamber. Suppose you conducted your experiment and discovered one of your chambers had a lower in-flow of air relative to the other chambers. What would this do to your data in that chamber?

a. It would not change the results.

b. It would bias the results toward more respiration.

c. It would bias the results toward less photosynthesis.

d. It would bias the results toward more photosynthesis.

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Answer:

Without the respiratory system your blood would be useless. The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body

Explanation:

Answer:

Explanation:

The speed of an object can be found by using the formula

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

where

d is the distance

t is the time taken

From the question we have

\(v = \frac{100}{30} = \frac{10}{3} \\ = 3.333333...\)

We have the final answer as

Hope this helps you

If 3.7 grams of cl2 are used, HCl produced from the reaction is 7.4 grams.

A balanced chemical reaction formed when the number of the atoms involved in the reactants side is same to the number of atoms in the products side.

The balanced chemical equation is

H₂ + Cl₂ ⇒ 2HCl

From the balanced equation above,

1 gram of Cl₂ reacted to produce 2 gram of HCl

To determine the grams of HCl produced

From the balanced equation above,

1 gram of Cl₂ reacted to produce 2 gram of HCl

Therefore,

3.7 gram of Cl₂ will react to produce

= 3.7 × 2

= 7.4 grams of HCl

Thus, if 3.7 grams of cl2 are used, HCl produced from the reaction is 7.4 grams.

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The solution with the greatest boiling-point elevation among the given options is Mg(NO₃)₂.

The boiling-point elevation of a solution depends on the concentration of solute particles. In this case, we have three solutions: Mg(NO₃)₂, NaNO₃, and C₂H₄(OH)₂.

Mg(NO₃)₂ dissociates into three ions: Mg²⁺ and two NO₃⁻ ions. NaNO₃ dissociates into two ions: Na⁺ and NO₃⁻. C₂H₄(OH)₂ does not dissociate, so it remains as one molecule.

Since the boiling-point elevation is directly proportional to the number of solute particles, Mg(NO₃)₂, with three ions per formula unit, will have the greatest boiling-point elevation. NaNO₃ has two ions per formula unit, and C₂H₄(OH)₂ has no ionization, resulting in fewer solute particles and lower boiling-point elevation compared to Mg(NO₃)₂.

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Answer:A

Explanation:just casuse

Option c) NH4Cl will hydrolyze when dissolved in water.

Hydrolysis is a chemical reaction that occurs when a salt reacts with water, resulting in the formation of an acidic or basic solution. In this case, when NH4Cl (ammonium chloride) is dissolved in water, it undergoes hydrolysis.

The ammonium ion (NH4+) is the conjugate acid of ammonia (NH3), which is a weak base. When NH4Cl dissociates in water, the ammonium ion reacts with water to form NH3 and H3O+ (hydronium ion). This process is called hydrolysis.

NH4+ (aq) + H2O (l) ↔ NH3 (aq) + H3O+ (aq)

The formation of NH3 leads to an increase in the concentration of hydroxide ions (OH-) in the solution, making it slightly basic. At the same time, the presence of H3O+ ions makes the solution slightly acidic. Therefore, the hydrolysis of NH4Cl results in a slightly acidic and slightly basic solution.

In contrast, salts like NaCl and KCl do not undergo hydrolysis when dissolved in water because they consist of cations (Na+ and K+) and anions (Cl-) that do not react with water to form acidic or basic species.

Na2SO4 (sodium sulfate) is also an example of a salt that does not undergo hydrolysis. The sulfate ion (SO42-) does not react with water to form acidic or basic species, so the solution remains neutral.

Therefore, among the given options, only NH4Cl undergoes hydrolysis when dissolved in water.

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The question is incomplete. Find the full content below:

Which one of the following salts when dissolved in water will hydrolyse?

a) NaCl

b) KCl

c) NH4Cl

d)Na2SO4

Ethane gas reacts with oxygen gas to produce carbon dioxide gas and water vapor gas.

\(C2H6 (g) + O2 (g) → CO2 (g) + H2O (g)\)

Ethane gas is a hydrocarbon with the chemical formula C2H6. It is a colorless and odorless gas that is present in natural gas and is also produced through the refining of petroleum. Ethane is a member of the alkane family, which are hydrocarbons that have only single bonds between carbon atoms. The molecule consists of two carbon atoms and six hydrogen atoms.

Ethane has a boiling point of -88.6°C and a melting point of -182.8°C. It is highly flammable and can form explosive mixtures with air. Ethane is used primarily as a fuel for heating and cooking, as well as a feedstock for the production of other chemicals.

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Answer:

165.3 cm^3

Explanation: hope this is correct!!

P1 * V1 / T1 = P2 * V2 / T2

P1 = 84.6 kPa

V1 = 215 cm³

T1 = 23.5°C = 23.5 + 273 K = 296.5 K

At STP:

P2 = 101.3 kPa

V2 = ?

T2 = 273 K

The sodium ion, Na⁺, has the same electron configuration as a neon atom. The correct answer is C) neon atom.

A sodium ion, Na⁺, has 10 electrons, which is the same electron configuration as a neon atom (1s², 2s², 2p⁶). The electron configuration of a sodium atom is 1s², 2s², 2p⁶, 3s¹, so it has one more electron than a sodium ion. The electron configuration of a chlorine atom is 1s², 2s², 2p⁶, 3s², 3p⁵, so it has more electrons than both a sodium ion and a sodium atom.

The electron configuration of an argon atom is 1s², 2s², 2p⁶, 3s², 3p⁶, so it has a completely filled outer shell and is not isoelectronic with a sodium ion. Therefore, the correct answer is C) neon atom.

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Answer:

true

Explanation:

Answer:

true

Explanation:

because the dissolved salt is evenly distributed throughout

173 g of HF must react in order to produce 345 kJ of energy. Option (5)

The first step is to calculate the amount of energy produced by the reaction when 1 mole of HF reacts. From the balanced chemical equation, we can see that the reaction produces 4 moles of HF for every -184 kJ of energy released.

Therefore, the amount of energy released when 1 mole of HF reacts is:

\(\frac{-184,kJ}{4,mol,HF} = -46,kJ/mol,HF\)

Next, we can use this value to calculate the amount of HF needed to produce 345 kJ of energy:

\(\text{345 kJ} \times \frac{1,mol,HF}{-46,kJ} \times \frac{20.01,g,HF}{1,mol,HF} = 173,g,HF\)

Therefore, 173 g of HF must react in order to produce 345 kJ of energy.

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Full Question: According to the following thermochemical equation, what mass of HF (in g) must react in order to produce 345 kJ of energy? Assume excess SiO2.

SiO2(s) + 4 HF(g) → SiF4(g) + 2 H2O(l) ΔH°rxn = -184 kJ

1. Cl2 + H2O → HOCl + HCl

2. Tooth decay starts when when the pH of the mouth is lower than 5.5. Tooth enamel is made up of calcium phosphate and it is one of the hardest substances of the body. But it is corroded when the pH is less than 5.5. The bacteria of our mouth produce acids by degradation of sugar and food particles remaining in our mouth after eating food.

3. Fluorine salts are added in toothpaste to protect our teeth from tooth decay. Fluorine salts are mildly basic, so they neutrelise the acid in our mouth that leads to tooth decay.

4. Tincture of iodine is iodine, pottasium iodide and sodium iodide dissolved in ethanol. Iodine acts in an antiseptic manner by destroying microbial proteins and DNA.

5. Tincture of iodine is clear and reddish brown liquid.

Answer:

1.8 g of Pb(NO3)2

Explanation:

Find the moles of sodium chloride used by multiplying the molarity by the volume of sodium chloride.

Molarity = mol/L

Convert 23.5 mL to L.

23.5 mL x (1 L/1000 mL) = 0.0235 L

Multiply molarity by volume.

0.55 M = mol/0.0235 L

(0.55 M)(0.0235 L) = mol

mol = 0.012925

You have the moles of sodium chloride used so you can convert this to moels of lead (II) nitrate with stoichiometry. First, you need the balanced chemical equation.

Pb(NO3)2 + 2 NaCl -> PbCl2 + 2NaNO3

Convert 0.012925 mol NaCl with mole to mole ratio. In this case, it's 1:2.

0.012925 mol NaCl x (1 mol PbCl2/2 mol NaCl) = 0.0064625 mol PbCl2

Convert moles of PbCl2 to grams with molar mass.

0.0064625 mol PbCl2 x (278.10 g/1 mol) = 1.79722... g

Round to sig figs.

1.8 grams of PbCl2

Answer:

B

Explanation:

Cause metamorphic rock is formed by heat pressure overtime

The rock collected by Roger if it is metamorphic rock it is formed by pressure and heat over time. Hence, image image B represents a metamorphic rock.

Metamorphic rocks have undergone significant alteration from their igneous, sedimentary, or previous metamorphic forms. When rocks are exposed to extreme temperatures, high pressures, hot mineral-rich fluids, or, more frequently, some combination of these conditions, metamorphic rocks are created.

These kinds of conditions can be found deep inside the Earth or where tectonic plates collide. The process of metamorphism changes the rocks into denser, more compact rocks rather than melting them.

Either by the rearranging of mineral constituents or through chemical reactions with fluids that enter the rocks, new minerals are produced. Even rocks that have already undergone metamorphosis might undergo changes due to pressure or temperature. Many metamorphic rocks are bent, smeared out, and compressed.

Therefore, option B is correct.

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Because of the very short period in which nucleosynthesis occurred before it was stopped by expansion and cooling (about 20 minutes), no elements heavier than beryllium (or possibly boron) could be formed.

Big Bang nucleosynthesis occurred inside the first three minutes of the start of the universe and is chargeable for an awful lot of the abundance of H (protium), H (D, deuterium), He (helium-three), and He (helium-4).

Although He remains produced by stellar fusion and alpha decays and hint quantities of H remain produced by way of spallation and certain sorts of radioactive decay, most of the mass of the isotopes inside the universe is thought to be produced in the Big Bang.

The nuclei of these elements, together with a few Li and Be are taken into consideration to have been fashioned between 100 and 300 seconds after the Big Bang whilst the primordial quark-gluon plasma froze out to form protons and neutrons.

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Answer:

1.61 g

Explanation:

The freezing point depression of water due to the presence of salt can be calculated using the equation:

ΔTf = Kf × molality

where ΔTf is the freezing point depression, Kf is the freezing point depression constant for water (1.86 °C/m), and molality is the molal concentration of the solution.

Since ocean water freezes at approximately -1.8 °C, the freezing point depression is:

ΔTf = -1.8 °C - (-0.0 °C) = -1.8 °C

The molality of the solution can be calculated as:

molality = moles of solute / mass of solvent (in kg)

Assuming that all the dissolved salt is sodium chloride (NaCl), the molar mass of NaCl is 58.44 g/mol. Therefore, the number of moles of NaCl in the solution is:

moles of NaCl = mass of NaCl / molar mass of NaCl

moles of NaCl = (2.62 kg) × (35.0 g/kg) / 58.44 g/mol

moles of NaCl = 1.57 mol

The mass of water in the solution is:

mass of water = total mass of solution - mass of NaCl

mass of water = (2.62 kg) - (0.035 kg) = 2.585 kg

Therefore, the molality of the solution is:

molality = 1.57 mol / 2.585 kg = 0.607 mol/kg

Using the freezing point depression equation, we can solve for the mass of NaCl:

ΔTf = Kf × molality

-1.8 °C = 1.86 °C/m × 0.607 mol/kg × (1000 g/1 kg)

-1.8 °C = 1122.42 g/mol × x

x = 1.61 g

Therefore, the mass of sodium chloride in a 2.62-kg sample of ocean water is 1.61 g.

Answer:  " \(1.41 * 10^{24}\) " atoms of aluminum (Al) .

____________________________________

Explanation:

_________________________

Using a technique called "dimensional analysis" ; as follows:

________________________

→  " \(\frac{2.34 mol Al}{1} * \frac{6.022*10^{23}atoms Al}{1 mol Al} = ?\)  

________________________

The units "mol Al" ["moles of aluminum"] cancel out; and we have:

________________________

→  "\([(2.34) * (6.022 * 10^{23})] = ?\) atoms of Al [aluminum].

________________________

Note that by definition: 1 (one) "mole" (abbreviated "mol") of anything consists of " \(6.022*10^{23}\) " units " of that particular thing.

 This number:  6.022*10^{23} —is known as:  "Avogadro's number".

________________________

→  [ 2.34 * 6.022 * 10^23] ;

     = 1.409148 * 10^24 ;

                → Round to 3 (Three) significant figures;

                →  since: "2.34" has 3 (Three) significant figures;

                  →  to get: " \(1.41 *10^{24}\)  atoms of aluminum (Al).

________________________

Hope this is helpful to you!  Wishing you the best!

________________________

A metal with a mass of 71.68 g occupies a volume of 8.00 cm3. Then density of the metal 8.96 g/cm³.

Given

Mass = 71.68g

Volume = 8 cm³

Density =?

Density= Mass/Volume

= 71.68/ 8

= 8.96 g/cm³

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Answer:

150cm3

Explanation:

Volume=Length x Width x Height

3cm x 5cm x 10cm= 150cm3

Molality is defined as the "moles solute/kg solvent." Therefore, the correct option is (b).

What is Molality?

Molality (m) is a measure of the concentration of a solute in a solution, and is defined as the number of moles of solute per kilogram of solvent.

The equation for molality is:

m = moles of solute / mass of solvent in kg

Concentration is the ability to focus one's attention and mental effort on a specific task or activity. It involves filtering out distractions and staying attentive to the task at hand. The level of concentration can vary depending on the person, the task, and the environment.

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