How many sig figs are in 0.0003422

Answer:

Explanation:

chemistry lol

Answer:

A neutralization of a strong acid by a strong base gave out 5590 J of heat energy.

Determine the enthalpy change (in kJ) for the reaction.

Explanation:

A strong acid being neutralized by a strong base releases 5590 J of heat energy.

A chemical reaction in which an acid and a base interact quantitatively is known as neutralization or neutralisation. By neutralizing a reaction in water, surplus hydrogen or hydroxide ions are removed from the solution.

Neutralization is a sort of chemical reaction in which an acid and a base combine to produce salt and water. For instance: Reaction of sodium hydroxide and hydrochloric acid (HCl) Sodium hydroxide reacts with hydrochloric acid to form their salt sodium chloride (NaCl) and water.

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Answer:

heterogeneous mixture.

Explanation:

Fog is heterogeneous mixture of water, air and suspension particles.

Answer:

Take 1ml of given compound in a dry test tube. Add a few drops of ceric ammonium nitrate reagent and shake the solution well. Observe the solution. If red precipitate appears then the presence of alcoholic group is conformed.

Answer:

When a substance is heated, it gains thermal energy. Therefore, its particles move faster and its temperature rises. When a substance is cooled, it loses thermal energy, which causes its particles to move more slowly and its temperature to drop.

Answer:

If thermal energy (heat) is removed from a substance, the particles in that substance will slow down.

Answer:

O constant specific heat

Explanation:

Answer: Neutral Xe atom

Answer: 25%

Explanation:  

1. Transmittance, T= P/P0  

Where P = light exiting the cell

           P0 = light entering the cell

Therefore %T =  P/P0 ×100

           = 50/200×100

=25%

2. Absorbance, A= -log(T)

But T= 0.25

Therefore A= -log(0.25)

                  = 0.6020

Explanation:

Hypothesis is answer.

Have a great day

Answer:

B) +2; 6; -2

Explanation:

In order to know what the coordination number is, all we need to do is to count the number of ligands present in the coordination sphere. Coordination number refers to the number of ligands in the coordination sphere of a given complex. The coordination number here is 6.

The counter ion here is 2Na+. It means that the overall charge on the complex must be -2 because the magnitude of charge on the complex ion is exactly balanced by the number of counter ions.

The charge on the metal (x) must now be;

x + 0 + 4(-1) = -2

x - 4 = -2

x = -2 + 4

x = +2

Note that NH3 is designated as zero because it is a neutral molecule. Each NCS^- ion has a charge magnitude of -1.

Here are some questions on Personal Care services on E2020 are:

An infection is the entrance and growth of dangerous microorganisms in the body that harm the host, such as bacteria, viruses, fungus, or parasites.

Infections can be systemic (affecting the entire body) or localized (affecting a particular area of the body), and they can be moderate to severe.

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Answer: For most of the life the chromosomes exists in a loose noodle like structure. They become compact to fit into a very small space.

Explanation: The chromosomes consists of a very long DNA that is linear. The liner DNA also has many proteins associated with it which is called as histone proteins.

These proteins fold and gets packed into a compact form from loose noodle or thread like structure.

This is necessary to get into a compact structure because being in linear form would require much space which is not possible. So as to manage the space and many processes like replication, repair and gene expression it is necessary for the chromosomes to get compact.

Answer:

Carbon is stored on our planet in the following major sinks (1) as organic molecules in living and dead organisms found in the biosphere; (2) as the gas carbon dioxide in the atmosphere; (3) as organic matter in soils; (4) in the lithosphere as fossil fuels and sedimentary rock deposits such as limestone, dolomite

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

Answer:

don't know mass? or energy just search

Total distance=60m+40m=100m

Total Time=6+4=10s

#a

\(\boxed{\sf Speed=\dfrac{Distance}{Time}}\)

\(\\ \sf\longmapsto Speed=\dfrac{100}{10}\)

\(\\ \sf\longmapsto 10m/s\)

#b

Displacement=AC=60m

\(\\ \sf\longmapsto Velocity=\dfrac{Displacement}{Time}\)

\(\\ \sf\longmapsto Velocity=\dfrac{60}{10}\)

\(\\ \sf\longmapsto 6m/s\)

#C

Distance=60m

time=5s

\(\\ \sf\longmapsto Velocity=\dfrac{60}{5}=12m/s\)

#d

The velocity of A to C is greater than Velocity from C to A

Answer:

C. Because my teacher said so

Hope this helps :)

Answer:

Because my teacher said so

Explanation:

You good? lol

Answer:

.0000000000000000000003

Explanation:

Answer: Pentane C5H12

Explanation:

The boiling point of a substance is simply defined as the temperature whereby a liquid's vapor pressure is equal to the pressure that is surrounding the liquid and hence, the liquid will changes into vapor.

The likely molecular formula for this compound is Pentane i.e C5H12 due to the fact that its boiling point is between Butane with formula C4H10 and Hexane with formula C6H14 boiling points.

The molecular formula of the of the substance is \(\bold {C_5H_1_0}\) (pentane).

Boiling point:

It is the temperature at which liquid's vapor pressure is equal to the pressure that is surrounding the liquid and hence, the liquid start to into vaporize.

The boiling point of the given compound is 309 K which is between Butane  and Hexane.

Therefore, the molecular formula of the of the substance is \(\bold {C_5H_1_0}\) (pentane).

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The molarity of the NiSO₄ solution made by dissolving 38.81 grams of nickel (ii) sulfate, NiSO₄, in enough water to make 0.467 liters of solution is 0.535 M

First, we shall obtain the mole of 38.81 grams of nickel (ii) sulfate, NiSO₄. Details below:

Mole of NiSO₄ = mass / molar mass

= 38.81 / 154.75

= 0.25 mole

Now, we shall determine the molarity of the solution. Details below:

Molarity of solution = mole / volume

= 0.25 / 0.467

= 0.535 M

Thus, the molarity of the solution is 0.535 M

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The number of moles of a solute can be calculated using its molarity and volume. Here, the number of moles solute in 57.8 ml of 0.1045 potassium permanganate solution is 0.060 moles.

Potassium permanganate is is an ionic compound formed from the potassium and chromate ions. It is widely used as an oxidising agent and is a common standard reagent in dichrometric titrations.

The molarity of solution is a concentration term that is the ratio of the number of moles to the volume of solution in liters.

We have the molarity of potassium permanganate K₂Cr₂O₇ 0.1045 molar and the volume of its solution is 57.8 ml that is 0.57 L. Thus, the number of moles can be calculated as follows:

Molarity = Number of moles of solute / volume of solution in liter.

Number of moles = volume × molarity

                              = 0.57 L × 0.1045 M

                              = 0.060 moles.

Hence, the number of moles of solute in  in 57.81 mL of 0.1045 M K₂Cr₂O₇ (aq) is 0.060 moles.

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Answer: 2.61 x 10^-3 kg

Explanation:

2.61 g = 0.00261 kg

The gravimetric factor for Br- using silver bromide is 0.425.

The gravimetric factor is an expression that is used to convert grams of a compound into grams of a single element.

It is expressed as a ratio of the formula weight (FW) of the substance that is being determined to that of a second substance that is weighed.

For example formula of silver bromide is AgBr and the formula mass of silver bromide is 188 g/mol

Formula mass of bromide ion = 80 g/mol

Gravimetric factor = 80/1188

Gravimetric factor = 0.425

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Answer:

Explanation:

From the given information:

The concentration of metal ions are:

\([Ca^{2+}]= \dfrac{0.003474 \ M \times 20.49 \ mL}{10.0 \ mL}\)

\([Ca^{2+}]=0.007118 \ M\)

\([Mg^2+] = \dfrac{0.003474 \ M\times (26.23 - 20.49 )mL}{10.0 \ mL}\)

\(=0.001994 \ M\)

Mass of Ca²⁺ in 2.00 L urine sample is:

\(= 2.00 L \times 0.001994 \dfrac{mol}{L} \times \dfrac{40.08 \ g}{1 \ mol}\)

= 0.1598 g

Mass of Ca²⁺ = 159.0 mg

Mass of Mg²⁺ in 2.00 L urine sample is:

\(= 2.00 L \times 0.007118 \dfrac{mol}{L} \times \dfrac{24.31 \ g}{1 \ mol}\)

= 0.3461 g

Mass of Mg²⁺ = 346.1 mg

Answer:

Explanation:

The reaction that is described goes as follows:

2AgCl + Mg(OH)2 ---> MgCl2 + 2AgOH

The precipitate here is the MgCl2 salt.

I hope it helped!

The measure of the length of events and the duration of intervals between events is time.

The duration of events or the gaps between them can be measured, compared, or even ordered using time. The lengthy period of time that the Earth's geologic history takes up is known as geologic time. Starting at the beginning of the Archean Eon  formal geologic time runs until the present. Geology is defined as the "Science of the Earth."

Geology is the fundamental Earth science that examines how the earth created, its structure and composition, and the various forces acting on it. It is sometimes known as geoscience or earth science.

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Answer: The situation was Alexander Fleming made an experiment showing that the fungus produced a chemical that could kill bacteria. The scientific knowledge was based off Fleming's work, scientists produced the first antibitoic drugs.

It should reanalyze the data to determine whether their results contradicted your hypothesis if the experiment's findings did not support it. So shouldn't change the experiments, observations, or both in order to get results that support the theory.

An assumption or concept is given as a hypothesis for the purpose of debating it and testing if it might be true.

If the facts continually contradict the hypothesis, it is obvious that the hypothesis is not a viable explanation for the phenomenon you are examining. The proposed explanation is disproved, and we now look for a fresh hypothesis to explain the experimental results.

If the results confirm the prediction, the hypothesis is supported. Results can be used to disprove the hypothesis if the prediction was not confirmed by the data. By monitoring data and creating a new hypothesis using the new facts, you might need to come up with new questions. Make a finding and a forecast.

Thus, It should reanalyze the data to determine whether their results contradicted your hypothesis if the experiment's findings did not support it.

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A precipitate is an insoluble solute formed in a solution. No precipitate will form when magnesium acetate and strontium chloride react as they produce a soluble salt.

A precipitate is an insoluble particle that is formed when the ionic compounds react to produce insoluble salt.

Reaction when magnesium acetate and strontium chloride reacts is shown as:

Mg(CH₃COO)₂ (aq) +SrCl (aq) → MgCl₂ (aq) +Sr(CH₃COO)₂ (aq)

The substance containing acetate in the compound is always soluble and hence cannot make precipitate. Also, chloride gets soluble with magnesium.

Therefore, no precipitate will be formed.

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Q = Ksp = 1 × 10^(-12).

Substituting the values into the Nernst equation, we have:

0.799 V = E° - (RT/2F) * ln(1 × 10^(-12))

Now, solving for E°:

E° = 0.799 V + (RT/2F) * ln(1 × 10^(-12))

The value of R is the ideal gas constant, T is the temperature in Kelvin, and F is the Faraday constant.

To find the standard reduction potential at 25°C for the half-reaction Ag2CrO4(s) + 2e¯ → 2Ag(s) + CrO4²-(aq), we can use the Nernst equation, which relates the standard reduction potential (E°) to the equilibrium constant (K) and the reaction quotient (Q).

The Nernst equation is given as follows:

E = E° - (RT/nF) * ln(Q)

Given information:

Ksp = 1 × 10^(-12)

E = +0.799 V (standard reduction potential of Ag+ to Ag)

Since the reaction involves the dissolution of Ag2CrO4(s), the reaction quotient Q can be expressed as [Ag+]²/[CrO4²-].

Since the stoichiometry of the reaction is 2:1 for Ag2CrO4 to Ag+, we can say that [Ag+]² = Ksp.

Therefore, Q = Ksp = 1 × 10^(-12).

Substituting the values into the Nernst equation, we have:

0.799 V = E° - (RT/2F) * ln(1 × 10^(-12))

Now, solving for E°:

E° = 0.799 V + (RT/2F) * ln(1 × 10^(-12))

The value of R is the ideal gas constant, T is the temperature in Kelvin, and F is the Faraday constant.

Please note that without specific values for temperature (T) and the ideal gas constant (R), the exact standard reduction potential at 25°C cannot be determined.

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