Alkali metals, such as potassium, must be transported in special sealed containers because they have the ability to burn or explode upon contact with water due to their high reactivity. This is an example of a __________.

No, Ag₂SO₄ will not precipitate when 100ml of .050M AgNO3 is mixed with 10ml of 5x10-2 m Na₂SO₄ solution because the precipitate is made only in an aqueous solution.

Precipitation is the solid extract that is collect in a place. Precipitate is the concentration of the substance in a solution in a specific place.

Thus, No, Ag₂SO₄ will not precipitate when 100ml of .050M AgNO3 is mixed with 10ml of 5x10-2 m Na₂SO₄ solution because the precipitate is made only in an aqueous solution.

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Answer:

Metallic element are conductors, because it shows north and south pole. Nonmetallic elements are generally non-conductors. Pure solidionic compounds are conductors, because they are found in solid state, but molten ionic compounds are conductors or non-conductors), because ionic component show property of metal.Pure molecular compounds are generally (conductors or non-conductors). A concentrated aqueous solution of a strong acid such as HCl is a (conductor ornon-conductor), because. As the concentration of the HCl solution decreases, the conductance increases), because Mixtures of metalsare non-conductors), because it doesn't show property of metal.

Metals and molten ionic substances and electrolyte solutions, conduct electricity.

The words that fill in the blanks are;

Metals are conductors because of the presence of free electrons in the metal which are available.

In an ionic solid, the ions are the charge carriers and they are bound up in the lattice making the ionic solid not to be a conductor.

In the molten state, the crystal collapses and the ions are released. Hence, the molten ionic substance is a conductor.

Solutions of electrolytes such as HCl conducts electricity due to mobile ions which are charge carriers in solution. As the concentration of the solution decreases, the number of ions in solution decreases and the conductivity of the solution decreases accordingly.

Mixtures of metals called alloys are still conductors of electricity due to the presence of free electrons.

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Answer:

A catalyst remains unchanged during a chemical reaction, as it does not actively participate in the reaction but it acts by reducing the activation energy necessary for the reaction occur.

Explanation:

The question requires us to determine what happens to a catalyst during a chemical reaction.

A catalyst is a substance that is added to a chemical reaction with the purpose of increasing the rate of the reaction. The catalyst does not get used up or created during the reaction; instead, it remains unchanged as it does not participate directly in the chemical reaction.

A catalyst is able to increase the rate of the reaction by reducing the activation energy necessary for the reaction to happen. This happens because the catalyst changes the way that the reaction happens (the mechanism of the reaction), usually by forming an intermediate state with the reactants and being completely released from this intermediate at the end of the reaction.

Answer:

No

Explanation:

The gas will have more volume compared to the liquid.

Gases have no definite shape and no volume. They simply assume the shape of any container they are placed into. They will fill up the entirety of the bottle they are placed into.

Liquids have fixed volume although they do not have fixed shape. As they are held with weak intermolecular interactions, they are limited in space.

Therefore, they will maintain that initial volume at which they were introduced into the container.

Answer:

Here is your answer mate :D

Due to their porous and permeable nature, gravel and sand are excellent aquifer materials. The most permeable material is gravel.

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We can produce more products by;

A. Increasing the concentration of H₂ gas in the reaction vessel

B. Decreasing the temperature in the reaction vessel

C. Removing the H₂O from the reaction vessel as it forms

Water is created through an exothermic process. Heat energy is released when hydrogen gas (H2) and oxygen gas (O2) mix to make water (H2O). An exothermic reaction is characterized by this energy release.

The reaction's overall energy change is negative, which shows that energy is released. The reaction is exothermic because the extra energy is released as heat into the environment.

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Missing parts;

Water can be made using the reversible reaction shown. Which change would

keep this reaction from shifting to form more of the product?

2H₂+022H₂O + energy

A. Increasing the concentration of H₂ gas in the reaction vessel

B. Decreasing the temperature in the reaction vessel

C. Removing the H₂O from the reaction vessel as it forms

D. Increasing the temperature in the reaction vessel

According to the law of reciprocal proportions, they should combine in the ratio of 10.24:7.92:1.29 by mass.

According to the law of reciprocal proportions when two elements join to form more than one compound, the weights of one element that combine with a fixed weight of the another are in a ratio of small whole numbers.

In phosphine, phosphorus = 91.1 parts and hydrogen = 8.9 parts

So, 8.9 pads of hydrogen combine with phosphorus = 91.1 parts .

1 part of hydrogen combine =  91.1 / 8.9

= 10.24 parts

Similarly,

for water 88.8 / 11.2

= 7.92 parts of hydrogen

For Phosphorus tetra oxide

= 56.4 / 43.6

= 1.29 parts

Thus, According to the law of reciprocal proportions, they should combine in the ratio of 10.24:7.92:1.29 by mass.

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Answer:

the more sun there is, the taller the plant

Explanation:

The molarity of vinegar is 0.47368421 moles per liter.

To calculate this, we can use the following formula:

molarity = (initial_volume - total_volume_change) / final_volume

In this case, the initial volume is 7.5 mL, the total volume change is 21 mL, and the final volume is 28.5 mL. Plugging these values into the formula, we get:

molarity = (7.5 - 21) / 28.5 = -0.47368421

The negative value for molarity indicates that the solution is diluted. This is because the total volume of the solution increased by 21 mL, while the amount of solute (acetic acid) remained the same.

It is important to note that the molarity of a solution can change depending on the temperature. This is because the volume of a solution expands as it gets warmer. Therefore, it is important to measure the volume and temperature of a solution at the same time to get an accurate measurement of its molarity.

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The question is incomplete; the complete question is;

Which of the following statements is/are true for a 0.10 M solution of a weak acid HA?

a. [ H+] >> [ A−]

b. [ H+] = [ A−]

c. The pH is 1.00.

d. The pH is less than 1.00.

Answer:

b. [ H+] = [ A−]

Explanation:

Given the acid as HA, we know that being a weak acid, its dissociation in water can never be 100%. If it were a strong acid, then it could have undergone a 100% dissociation in solution. The conjugate base of a weak acid is a always a weak base hence A^- is expected to act as a weak base. At the same concentration, weak acids have a higher pH value than strong acids. Hence if the pH of a strong acid HA is 1, then the pH of a weak acid HA must be greater than 1.

But, we look at the equation for the dissociation of the weak acid HA

HA(aq)⇄H^-(aq) + A^-(aq). This implies that the HA dissociates in a 1:1 ratio therefore; [H+] = [ A−], hence the answer given above.

Answer:

3.1x10²³

Explanation:

I'm going to answer the question assuming the number of molecules of FeCl₃ is asked, rather than the number of atoms.

First we convert 9.3x10²³ atoms of HCl into moles of HCl, using Avogadro's number:

Then we convert 1.54 moles of HCl into moles of FeCl₃, using the stoichiometric coefficients of the reaction:

Finally we calculate how many FeCl₃ molecules are there in 0.51 moles:

The closest option is 3.1x10²³.

The number of atoms produced is four times the number of FeCl₃ molecules produced.

Answer: true

Viewed simply, electrons are arranged in shells around an atom's nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy. An atom's electron shell can accommodate 2n2 electrons (where n is the shell level).

Answer: So if you had 570 cm of ribbon, then 570%2F8.5=67.05 which means that about 67 students can do the experiment (round down to the nearest whole number).

Explanation: If you had 8.5 cm of ribbon, then only 8.5%2F8.5=1 student can do the experiment. If you had 17 cm of ribbon, then 17%2F8.5=2 students can do the experiment.

Answer:

32.062

Explanation:

The following data were obtained from the question:

Mass of isotope A (32S) = 31.97207 u

Abundance of isotope A (A%) = 95.0%

Mass of isotope B (33S) = 32.97146 u Abundance of isotope B (B%) = 0.76%

Mass of isotope C (34S) = 33.96786 u

Abundance of isotope C (C%) = 4.22%

Mass of isotope D (36S) = 35.96709 u Abundance of isotope D (D%) = 0.014%

Average atomic mass of S =..?

The average atomic mass of sulphur, S can be obtained as follow:

Average atomic mass = [(Mass of A x A%)/100] + [(Mass of B x B%)/100] + [(Mass of C x C%)/100] + [(Mass of D x D%)/100]

Average atomic mass of sulphur =

[(31.97207 x 95)/100] + [(32.97146 x 0.76)/100] + [(33.96786 x 4.22)/100] + [(35.96709 x 0.014)/100]

= 30.373 + 0.251 + 1.433 + 0.005

= 32.062

Therefore, the average atomic mass of sulphur is 32.062

If we add more magnesium to the reaction, the reaction speed will increase.

The chemical reaction shown is a single-displacement reaction, also known as a single-replacement reaction. In this type of reaction, one element replaces another element in a molecule, producing a new compound and a different element.

In the given reaction, magnesium (Mg) reacts with sulfuric acid (H₂SO₄) to produce magnesium sulphate (MgSO₄) and hydrogen gas (H₂). This can be represented by the following balanced chemical equation:

Mg + H₂SO₄ → MgSO₄ + H₂

This is because the amount of reactant determines the number of reactions that can occur. If the amount of magnesium is increased, more magnesium atoms are available for the reaction with sulfuric acid, leading to a higher rate of reaction.

However, this increase in reaction rate is only valid up to a certain point, after which further addition of magnesium will not lead to an increase in rate of reaction. This is because other factors such as the concentration of sulfuric acid and the temperature of the reaction may become limiting factors that can no longer be compensated by adding more magnesium.

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(a). Remember that oxides are compounds that are formed by oxygen and another element. Oxygen has always been the 2- ion. So, to write the formula of manganese oxide, you can follow the steps:

You can realize that the algebraic sum of these two ions is +3 (2) + 3 (-2) = 0. The algebraic sum of the ions of each element must be always zero, so the formula of manganese oxide is Mn2O3.

(b). Magnesium has always the ion +2, which is called the oxidation number too. We have that the oxidation numbers of phosphorus are -3, -4, and -5. The name phosphide is telling us that we have to use the less number of ions that phosphorus has, in this case, is -3. So applying the last process ( Part (a) ), we can conclude that the formula of magnesium phosphide is Mg3P2. You can note that the algebraic sum of the ions is: +2 (3) -3 (2) = 0.

Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

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Answer:

3- gamma radiation

Explanation:

Hello,

In the above question, 4 of the options are related to polymerization which are

1. Synthetic polymer

2. Natural polymer

3. Condensation polymerization

4. Addition polymerization.

The first two options are types of polymer that exists while the last two are polymerization techniques.

The odd option here which is "gamma radiation" is a particle which is emitted from radioactive substances during decay. It has no mass and no charge but it is highly penetrating and dangerous to human health.

However,

Synthetic polymers are also known as man made polymers and they exist around us because they're present in materials which we use everyday. An example is polyethylene, nylon-6,6 etc

Natural polymers are compounds which are polymeric in nature (compounds catenating to form a complex molecule). Natrual occurring polymers can be found in proteins and some lipids.

Answer:

1

The reaction is exothermic

2

\(H =  -1.1 \  KJ\)

3

\(\Delta H_{rxn} = -6.24 \  KJ/ mol\)

Explanation:

From the question we are told that

  The mass of the sodium chloride is (NaCl ) is  \(m_s =  10.3 \  g\)

  The mass of water is  \(m_w  =  250 \  g\)

  The initial  temperature is  \(T_i =  23^oC\)

   The temperature after 3 minutes is  \(T_3 =  22.2 ^oC\)

   The time taken for temperature to fall is  t =  3 minutes

The  reaction is

       \(NaCl_{ (s)} \rightarrow Na^+ _{(aq)} + Cl^-_{ (aq)}\)

The reaction is exothermic because the temperature fell  

Generally the mass of the solution is  mathematically represented as

           \(M  =  m_w   +  m_s\)

=>        \(M  =  250  +    10.3 \)

=>        \(M  =  260.3 \ g \)

Gnerally the heat energy released from the solution is mathematically represented as

       \(H =  M  *  C_s * (T_3 -  T_i)\)

Here \(C_s\) is the specific heat of solution which for this question we would assume it is the specific heat of water which has a value of

    \(Cs = C_w = 4.18 J/g^oC\)

So

   \(H =  260.3  *  4.18 * (22-  23)\)  

    \(H =  -1088.054 \  J\)  

      \(H =  -1.088054 \  KJ\)  

     \(H =  -1.1 \  KJ\)

Generally the number of moles of NaCl is mathematically represented as

     \(nNaCl =  \frac{m_s}{zNaCl}\)

Here  \(zNaCl\) is the molar mass of NaCl  and the value is

   \(zNaCl =  58.44 \ g/mol\)

So

      \(nNaCl =  \frac{10.3}{58.44 }\)

=>    \(nNaCl =  0.1762 \  moles\)

Generally reaction enthalpy is mathematically represented as

         \(\Delta H_{rxn} =  \frac{H}{nNaCl}\)

         \(\Delta H_{rxn} =  \frac{-1.1}{0.1762 }\)

         \(\Delta H_{rxn} = -6.24 \  KJ/ mol\)

Answer:

1.28 atm

Explanation:

To solve this problem, you need to use the gas laws, more specifically the Combined Gas Law. It is P1V1/T1 = P2V2/T2. Simply plug your values in. But be careful! Make sure you convert your 20 degree C and 28 deg C to Kelvin, as that it the only temperature scale the Gas Laws work with. Upon plugging in your values, you get approximately 1.28 atm.

Answer: An electron con only exist in a limited number of quantized energy levels.

Explanation:

Answer: 6.23

Explanation:

1) solve for pH  

pH=-log (H3O+) = - log 1.7 X 10^-8 =7.77

2) now do 14-pH  = 14 -7.77=6.23

Moles of Oxygen they took in : C. 2.42

The gas equation can be written  

\(\large{\boxed{\bold{PV=nRT}}}\)

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08205 l.atm / mol K  

T = temperature, Kelvin  

P=1000 kPa

V = 6 L

T = 298 K

moles of Oxygen :

\(\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1000\times 6}{8.31\times 298}\\\\n=2.42~moles\)

In the given reaction, carbon disulfide acts as an excess reagent and oxygen acts as a limiting reagent.

a) Oxygen is the limiting reactant.

b) 0.667 moles of carbon disulfide will still be present.

c) The formation of 0.333 moles of carbon dioxide and 0.667 moles of sulfur dioxide.

provided here,

To make 1 mole of carbon dioxide and 2 moles of sulfur dioxide from 1 mole of carbon disulfide, 3 moles of oxygen are required.

1.00 ol of carbon disulfide is the number of moles.

One mole of oxygen is equal to 1.00 mol.

The limiting reactant is oxygen. It will be totally eaten. (1.00 mol).

(B) An excess reactant is carbon disulfide. It will respond with

Oxygen reacts with 0.33 moles of carbon disulfide.

The extra reagent still present:

0.667 moles There will be a residue of carbon disulfide.

In order to make one mole of carbon disulfide and one mole each of carbon dioxide and sulfur dioxide, you need three moles of oxygen.

The carbon dioxide equivalent for 1 mole of oxygen is 1 mole/3, or 0.333 moles.

Sulfur dioxide is equal to 0.667 moles per 1.00 mol of oxygen (1.00 mol/(3/2)) mol.

Since carbon disulfide is an excess reagent in the above reaction, oxygen is a limiting reagent.

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Answer:

Preventing erosion – Land Reclamation

Protecting nesting areas – Protecting Biodiversity

Preventing littering – Land Reclamation

Preventing habitat disruption – Protecting Biodiversity

Protecting native species – Protecting Biodiversity

Preventing contamination of soil – Land Reclamation

Explanation:

I really hope I'm right! I tried my hardest, please give me brainliest :)

have a good day!

Answer:

C

Explanation:

Because they 2 or more atoms

Answer:

H⁺(aq) + H₂O(l) ⇄ H₃O⁺(aq)

Explanation:

According to Brönsted-Lowry acid-base theory, an acid is a substance that donates H⁺. Let's consider the molecular equation showing that benzoic acid is a Brönsted-Lowry acid.

C₆H₅COOH(aq) + H₂O(l) ⇄ C₆H₅COO⁻(aq) + H₃O⁺(aq)

The complete ionic equation includes all the ions and molecular species.

C₆H₅COO⁻(aq) + H⁺(aq) + H₂O(l) ⇄ C₆H₅COO⁻(aq) + H₃O⁺(aq)

The net ionic equation includes only the ions that participate in the reaction and the molecular species.

H⁺(aq) + H₂O(l) ⇄ H₃O⁺(aq)