(40) If a hypothesis is proven correct, a theory is formulated.
True or false

Answer:

Nonmetals are located on the upper right side of the Periodic table (see above image). Exception: Hydrogen is a nonmetal which is located on the left top corner of the Periodic table. Well, you have got the answer of “Where are Nonmetals located on the Periodic Table?”

Explanation:

Answer:

The pH of pure water is 7, the negative logarithm of 1 X 10-7. A neutral solution is one that is neither acidic nor basic. The hydrogen ion concentration equals the hydroxide ion concentration, and both equal 1 X 10-7 M. In a neutral solution, then, pH = pOH = 7.

Explanation:

The hydrogen ion concentration equals the hydroxide ion concentration, and both equal  to [tex]1 X 10^{-7}[/tex] M. Hence, in a neutral solution, then, pH = pOH = 7.

pH is a quantitative measure of the acidity or basicity of aqueous or other liquid solutions.

pOH is calculated by taking negative logarithm of hydroxide ion concentration.

The pH of pure water is 7, the negative logarithm of [tex]1 X 10^{-7}.[/tex]

A neutral solution is one that is neither acidic nor basic.

The hydrogen ion concentration equals the hydroxide ion concentration, and both are equal to [tex]1 X 10^{-7}[/tex] M.

Hence, in a neutral solution, then, pH = pOH = 7.

Learn more about the pH here:

https://brainly.com/question/16745007

#SPJ2

Answer: Zn2+

Explanation:

The standard reduction potential of the given species is as follows:-

[tex]\begin{aligned}&Z_{(aq)}^{2+}+2 e^{-} \longrightarrow {Zn}(\mathrm{s}) \quad E^{\circ}=-0.76 \mathrm{~V}\\&\mathrm{Mn}_{(\text {aq) }}^{2+}+2 e^{-} \longrightarrow \mathrm{Mn}(\mathrm{s}) \quad E^{\circ} = -1.03 \mathrm{~V}\\&\mathrm{Na}^{+}_{(\text {aq) }} + e^{-} \longrightarrow \mathrm{Na}\text{(s)} \quad E^{\circ}=-2.71 \mathrm{~V}\end{aligned}[/tex]

[tex]\begin{aligned}&\mathrm{Al}_{(\text {aq) }}^{3+}+3 e^{-} \longrightarrow \text {Al}\text{(s)}\quad E^{0}=-1.66 \mathrm{~V}\\&\mathrm{Li}^{+}(aq)+{e}^{-} \longrightarrow \mathrm{Li}\text{(s)} \quad E^{0}=-3.05 \mathrm{~V}\end{aligned}[/tex]

In the electrochemical series, the species having the lowest electromotive force—the lowest negative value—will be reduced first and the species having the highest negative value will be reduced last

Therefore, Zn2+ will be reduced first and Li+ will be reduced last

The reduction has been defined as the loss of electrons. The species of molten salt that reduces first has been zinc ion in electrolysis.

The electrolysis has been defined as the process of the ionization of the salt under the influence of the electric field.

The species with the lowest reduction potential will reduce first. The reduction potential of the following is:

Zinc has the lowest reduction potential and thus is the reduced first among the others.

Learn more about electrolysis, here:

https://brainly.com/question/12054569

The products of this reaction between aluminum and sulfuric acid are two: hydrogen and aluminum sulfate.

This concept refers to the substances obtained at the end of the reaction.

It means to make sure there are the same molecules in the reactants and products.

2Al + 3H2SO4 = Al2 (SO4)3 + 3H2

Learn more about chemical reaction in: https://brainly.com/question/3461108

Answer:

0.271J/g°C

Explanation:

mass of iron=93.3g

∆°C=65.58

mass of water=75g

C of water=4.184

∆°C=22.4-16.95=5.29°C

mc∆°C of iron = mc∆°C of water

93.3×C×5.29=75×4.184×5.29

C=75×4.185×5.29/93.3×65.58

C=0.271J/g°C

Answer:

It plays the role of a catalyst.

Answer:

Yes, because they have strong wings..

Answer:

20÷4=5g/ml, bcz it is in mL but in other situations you will need to convert it to L by dividing it by 1000

Mass= 20.0g

Volume= 4.0mL

Density of substance

[tex]\text{Density} = \frac {\text{Mass}}{ \text{Volume}}[/tex]

[tex] \text{Density} = \frac{20.0 \text{ \: g}}{4.0 \: \text{mL}} \\ \\ \text{Density} = \frac{ \cancel{20.0}\text{ \: g}}{ \cancel{4.0} \: \text{mL}} \\ \\ \text{Density} = 5.0 \: \text{g/mL}[/tex]

[tex]\therefore \text{Option B}= 5.0 \: \text{g/mL is the correct answer}[/tex]

c. A sulfide ion has 2- charge because it gaines two electrons

thia statement is true.

Answer:

a new scientific discovery that benefits the environment

A FAS-DPD titration is as simple as a test for total alkalinity or calcium hardness. A buffered DPD indicator powder is added to a water sample and reacts with chlorine to produce the pink color characteristic of the standard DPD test.

In which method ferric ammonium sulphate is used as an indicator?

Chemical analysis is the name of the method when ferric ammonium sulphate is used as the indicator. Basically, this method is used in the making of pharma elements. It is used in standardizing the formulation.

What is a DPD test?

The DPD test is used extensively in water treatment to determine the level of disinfectant present. In most cases, this is Free Chlorine but it can be used to measure other parameters ( oxidants ). It is a quick and relatively easy test which requires little background or skill to perform.

Learn more about Ferrous ammonium sulfate here:  https://brainly.com/question/10834028

#SPJ2

Answer: The correct answer is 188.03K.

Explanation:

As a result, the gas sample will have a volume of 551mL at a temperature of 188.03K.

Answer:

C) Solar Energy, i,e, Energy that comes from the sun

A.2-octene  is the name of the molecule shown below.

The oct part of the name indicates the parent chain. In this case, oct- is an abbreviation for octane, which means that there are 8 carbons in the parent chain. The first part of the name, cis-2. 2 is used to indicate the first atom that forms the double bond above.

Alkenes are classified into higher olefins and alpha olefins. This means that the double bond is in the alpha (primary) position, which makes the compound more reactive and provides useful chemistry.

Learn more about octene here: https://brainly.com/question/14322060

#SPJ2

a. For the given combination of reactants, the limiting reagents is F₂

b. The mass of HF that would be made is 106.65 g

From the question, we are to identify the limiting reagent and calculate the mass of HF made

First, we will write the balanced chemical equation for the reaction

3F₂ + NH₃ → 3HF + NF₃

This means 3 moles of F₂ reacts with 1 mole of NH₃ to produce 3 moles of HF and 1 mole of NF₃

From the given information,

We have 5.33 moles of F₂ and 2.22 moles of NH₃

Since,

3 moles of F₂ reacts with 1 mole of NH₃

Then,

5.33 moles of F₂ will react with 1.78 moles of NH₃

Therefore, NH₃ is in excess and F₂ is the limiting reagent

Hence, for the given combination of reactants, the limiting reagents is F₂

b. For the mass of HF that would be made

From the balanced chemical equation,

3 moles of F₂ reacts with 1 mole of NH₃ to produce 3 moles of HF

Then,

5.33 moles of F₂ will react with 1.78 moles of NH₃ to produce 5.33 moles of HF

Number of moles of HF produced = 5.33 moles

Using the formula,

Mass = Number of moles × Molar mass

Molar mass of HF = 20.01 g/mol

∴ Mass of HF produced = 5.33 × 20.01

Mass of HF produced = 106.65 g

Hence, the mass of HF that would be made is 106.65 g

Learn more on Stoichiometry here: https://brainly.com/question/25658862

The product of heating succinic acid is succinic anhydride, which is a structure with four carbon atoms, four hydrogen atoms, and three oxygen atoms.

If succinic acid is heated the initial reactant (succinic acid) releases water, which changes the identity of the substance as succinic acid becomes succinic anhydride.

Learn more about chemical reactions in: https://brainly.com/question/22817140

The boundary of a watershed is defined by the highest elevations surrounding a lake or river segment. A drop of water falling outside of the boundary will drain to another watershed.

Answer:

The boundary of a watershed is defined by the highest elevations surrounding a lake or river segment. A drop of water falling outside of the boundary will drain to another watershed.

Explanation:

Answer:

Because it went through a chemical change which changes its atomic form

Answer:

the chemical formula of benzaldehyde is C₇H₆O

The most metallic element must have the most negative reduction potental therefore, the most metallic element here is calcium.

A metal belongs to the groups that appear at the left hand corner o the periodic table. These elements are often sonorous when struck and possess a characteristic lustre.

We must know that the most metallic element must have the most negative reduction potental. Hence, the most metallic element here is calcium.

Missing parts: Select the element with the greatest metallic character. Li, Al, Cs, Ca​

Learn more about metals: https://brainly.com/question/16759172

Answer:

snow, or freezing rain?

Explanation:

because freezing rain can occur then, but snow is more common.

[tex]\tt \large{\boxed{\bold{Nt=No.(\frac{1}{2}) ^{\frac{T}{t1/2} } }}[/tex]

Nt/No = 1/8

T = duration of decay

t 1/2 = half-life

[tex]\tt \dfrac{1}{8}=\dfrac{1}{2}^\dfrac{T}{5}}\\\\(\dfrac{1}{2})^3=\dfrac{1}{2}^\dfrac{T}{5}}\\\\3=\dfrac{T}{5}\rightarrow T=15~years[/tex]

Answer:

90.35 × 10²³ atoms

Solution:

1 molecules of H20 contains 3 atoms,.

And we know that one mole of any molecule contains 6.023 × 10²³ atoms from Avogadro's number,

hence 5 moles of H20 will contain = 5× 6.023 × 10²³ × 3 atoms = 90.35 × 10²³ atoms!

Thanks for joining brainly community!

Answer:

it is charles's law

Explanation:

volume does matter with pressure

Answer:

Formula/Molecular Mass = 147.77415g/mol = 148g/mol (to 3 significant figures)

Explanation:

Given the Law of the Conservation of Mass, the amount of H2O produced will be equal to 10.00g-4.40g = 5.6g

Given equation n=m/M ,

n(H2O)= 5.6/ (1.008×2)+(15.999) = 0.318520677 moles

∴ x=0.318520677 moles

∴ Molecular mass (hydrated sodium sulfate) =

= (22.990×2)+(32.06)+(15.999×4)+[0.318...((1.008×2)+(15.999))]

= 147.77415g/mol

Answer:

Answer is in the attachment:

x=10

Explanation:

The rate of second order reaction depends on the change in the concentration of the reactants.

A second order reaction is one in which the rate of reaction depends on the concentration of reactants.

For a second order reaction;

1/[A] = kt + 1/[A]o

When concentration deceresases to one-half;

1/0.1 = 0.54t + 1/0.20

1/0.1 -  1/0.20 = 0.54t

10 - 5/0.54 = t

t = 9.3 s

When concentration deceresases to one-sixteenth;

1/0.0125 = 0.54t + 1/0.20

1/0.0125 -   1/0.20 = 0.54t

80 - 5 =  0.54t

t = 80 - 5/0.54

t = 149 s

When concentration deceresases to one-ninth;

1/0.022 =  0.54t + 1/0.20

1/0.022  -   1/0.20 = 0.54t

45 - 5 =  0.54t

t = 45 - 5/0.54

t = 74 s

Learn more about second order reaction: https://brainly.com/question/12446045