Help! Can someone please explain and break down the answers to both? I’m so confused!

1) The moles of H2O that f am be obtained from 15.0mL of 0.250 M HCl

2) the volume of 0.150 M KMnO4 needed to replaced 1.85 mol MnCl2

pH of the Sr(OH)₂ solution : 12.6

pH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.  

pH = - log [H⁺]  

Sr (OH) ₂ solution is a base with valence 2, so we determine the pOH from the OH ion concentration - which is expressed by pOH = - log [OH -]. After that we determine the pH value from the relationship:

[H⁺] [OH⁻] = Kw=10⁻¹⁴

pH + pOH = 14

Sr(OH)₂⇒Sr²⁺+2OH⁻

From equation [Sr(OH)₂] : [OH⁻]=1 : 2, so [OH⁻]=

[tex]\tt [OH^-]=2\times 2.10^{-2}=4.10^{-2}~M[/tex]

[tex]\tt pOH=-log[OH^-]\\\\pOH=-log~4.10^{-2}\\\\pOH=2-log~4\rightarrow 1.398 \\\\pH+pOH=14\\\\pH=14-1.398\\\\pH=12.6[/tex]

pH is the measurement of the concentration of hydrogen or hydronium ion in an aqueous solution. The pH of strontium hydroxide is 12.6.

The pH is the potential of hydrogen or the negative log of its concentration.

First, calculate the pOH of strontium hydroxide by:

[tex]\begin{aligned} \rm pOH &= \rm - log [OH ^{-}]\\\\&= \rm -log [4\times10^{-2}]\\\\&= 1.398\end{aligned}[/tex]

Now, calculate pH from pOH as:

[tex]\begin{aligned}\rm pH &= 14 - \rm pOH\\\\&= 14 - 1.398\\\\&= 12.6\end{aligned}[/tex]

Therefore, 12.6 is the pH of strontium hydroxide.

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same number of each kind of atom appears in the reactants and in the products

i dont see any processes below

Answer:

Heat and pressure

Explanation:

got it on study island

Answer: Oxygen and glucose.

Explanation:

Oxygen and glucose are both reactants in the process of cellular respiration. The main product of cellular respiration is ATP; waste products include carbon dioxide and water.Jun 1, 2020

Answer:

1. The properties of matter include any traits that can be measured, such as an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more.

2. A chemical property is a characteristic of a particular substance that can be observed in a chemical reaction.

3. Toxicity and acidity.

4. A chemical property describes the ability of a substance to undergo a specific chemical change. A chemical reaction is a process that occurs when one or more substances are changed into one or more new substances.

5. The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories. Some reactions will fit into more than one category.

Hope this helps you~

Answer:

Explanation:

An atom is the smallest unit of an element that can take part in a chemical reaction. Atoms are made up of protons, neutrons and electrons. Atoms can exist as a monoatomic (such as in the case of Helium, Xenon and Neon) or as diatomic (such as in the case of oxygen and nitrogen). Atoms take part in a chemical reaction and there reactivity varies among themselves.

From the above, it can be deduced that atoms have protons, neutrons and electrons. The number of protons (which is positively charged) of an atom determines it's position on the periodic table because elements in the periodic table are arranged according to the number of protons (called atomic number). The electron(s) present in the outermost shell of each atom (called valence electrons) determines there chemical reactivity. What happens here is that, all atoms (except noble gases) want to achieve there duplet or octet configuration so as to become stable. This octet configuration means they want to have there outermost shell completely filled (with eight electrons or two electrons for duplet). They usually achieve this configuration by taking part in chemical reactions. Thus, when an atom has just one electron in it's outermost shell, it becomes easy to lose it to another atom by way of interacting with it in a chemical reaction. When it loses this single electron (valence electron) in it's outermost shell, it becomes stable with the inner completely filled shell (that would be the new outermost shell). Examples include Lithium, sodium and potassium. Sodium (with eleven electrons and three shells) would lose the single electron in it's outermost shell so as to have just two shells with the second shell completely filled with eight electrons. Thus, the more the valence electron to be lost to achieve the octet structure, the lesser the reactivity of the atom.

Also, an atom that has just one electron to complete it's own outermost shell and thus achieve it's octet structure is also highly reactive. This is also because it is easy for this atom to receive a single electron and become completely filled. Examples include chlorine, fluorine and iodine. Fluorine (with nine electrons and two shells) will easily accept one more electron so as to achieve it's octet structure with a completely filled outermost shell (of eight electrons). Thus, the lesser the electrons to be gained to achieve the octet configuration, the higher the chemical reactivity of such atoms. Noble gases have extremely low or no reactivity at all for this reason because it has a completely filled outermost shell (no losing or donating).

It should also be noted that metals (which are found on the left of the periodic table) exist as monoatomic while gases (which are found on the right), with the exception of noble gases, are mostly diatomic.

The reactivity of atoms of elements in the periodic table depends on their valency as well as their position in the periodic table.

The periodic table contains an arrangement of atoms in order of increasing atomic numbers. Elements in the periodic table are arranged in groups. Each group of elements have atoms that contain the same number of valence electrons.

Atoms of alkali and alkaline earth metals as well as atoms of halogens are highly reactive. This has something to do with the number of valence electrons they contain. The alkali and alkaline metals give out their electrons easily are high reactive while the halogens accept electrons easily are also highly reactive.

Alkali and alkaline earth metals have a few valence electrons so they give them out easily. Halogens have seven valence electrons hence they accept electrons easily. Reactivity of metals generally decreases from left to right in the periodic table while the reactivity of nonmetals increases from left to right. The elements of group 18 are placed in the last group because they are unreactive.

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The following objects will exert the greatest gravitational force on a box⇒ 8 kg mass

Gravity is a force that arises because of the attraction between objects with mass.  

The magnitude of this attraction is proportional to the mass of the object.  

The greater the mass of the object, the greater the gravitational force  

Relationships can both be stated in  

Newton's Gravity Law:  

[tex]\rm F=G.\dfrac{m_1.m_2}{r^2}[/tex]

with F = gravitational force,  

G = gravitational constant,  

m1, m2 = mass of object,  

r = distance between two objects.  

The distance-r and mass of the box(m₁) are the same, then the largest object's mass (m₂)exerts a large gravitational force, because the gravitational force is directly proportional to the mass of the two objects

Answer:

Red and Orange

Explanation:

Complementary colors are those colours located across from each other on a color wheel. If we look at the colour wheel attached to this answer, we will see various complementary colours shown.

A good look at the attached colour wheel reveals that blue Cu2+ ions absorbs light around the red and orange portions of the visible spectrum.

Answer:

c. both gases have the same number of molecules

brainliest?

Answer:

5.The limiting reactant is completely used up in the reaction

Explanation:

The limiting reactant is completely used up in the reaction is the correct answer because a limiting reactant is a reactant in chemical reaction that is completely consumed or used up in the chemical reaction. Limiting reactant when it is completely used up limits the amount of products that will be formed. The reaction will be halted or will stop when the limiting reactant is totally used up.

The statement that is right as regards a limiting reactants in a reaction is 5:.The limiting reactant is completely used up in the reaction.

Therefore, option 5, is correct.

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OTHER OPTIONS THAT COMPLETE THIS QUESTION ARE:

The limiting reactant has a lower mass than other reactants.

2.The limiting reactant dictates the amount of product.

3.The limiting reactant is always the same for a given reaction.

4.There will be an excess of other reactants at the end of the reaction.

Answer:

–0.360 M/s

Explanation:

Explanation:

Im not sure what the other trait is so I couldn't do phenotype. I hope this still helps though

Answer:

28.8g

Explanation:

I think your chemical equation should be:

2KClO3 → 2KCl +3O2

Number of moles of KClO3

[tex] = \frac{mass}{molar \: mass} [/tex]

[tex] = \frac{69}{39 + 35.5 + 3(16)} [/tex]

[tex] = 0.6mol[/tex]

From the equation,

2 mol of KClO3 : 3 mol of 02

So...

0.6 mol of KClO3 : 0.9 mol of O2

Number of moles of O2= 0.9mol

So the mass of O2 formed = number of moles× molar mass

= 0.9 × 2(16)

= 28.8g

If 69 gram of KClO₃ decomposes then 27.036 grams of oxygen will form.

Stoichiometry helps us use the balanced chemical equation to measure the quantitative relationship and it is to calculate the amount of product and reactants that are given in a reaction.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

The given balanced equation is

2KClO₃ → 2KCl + 3O₂

According to Stoichiometry, x gram of oxygen will form

= [tex]69\ \text{g of}\ KClO_{3} \times \frac{1\ \text{mol}\ KClO_{3}}{122.55\ g\ KClO_{3}} \times \frac{3\ \text{mol}\ O_2}{2\ \text{mol}\ KClO_{3}} \times \frac{32\ g\ O_2}{1\ \text{mol}\ O_2}[/tex]

= 27.036 grams of Oxygen

Thus from the above conclusion we can say that If 69 gram of KClO₃ decomposes then 27.036 grams of oxygen will form.

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Initial temperature = -189.4  °C

Given

the volume of a gas is  changed from 3.6 L to 15.5 L

final temperature = 87 °C = 87+ 273 = 360 K

Required

initial temperature

Solution

Charles's Law

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]

[tex]\tt T_1=\dfrac{V_1.T_2}{V_2}\\\\T_1=\dfrac{3.6\times 360}{15.5}\\\\T_1=83.6~K=-189.4^oC[/tex]

Answer:

a+c=272

27a+24c=7,137

Explanation: Hope this helps!!!

Answer:

FeCl3 + 3KOH → Fe(OH)3 + 3KCl

Explanation:

Answer:

One orientation

Explanation:

A s orbital is a sphere like shape that surrounds the atomic nucleus that consists of electrons that can be found at the highest or lowest region of the orbital. S orbitals only consist of "one orientation" and is commonly mistaken by the p orbital because the p orbital also consists of electrons that can be found the most.

Hope this helps.

Answer:

Elements in the periodic table are arranged according to the increasing atomic number.

We can predict the chemical properties of an element by looking at it's position in the periodic table.

Answer: Provide the nuclear power plant with a plan to properly dispose of and recycle the wastes.

Explanation:

The nuclear power plant is producing huge amounts of electricity which is beneficial to the economy as it pushes growth. Shutting it down or relocating it is therefore not the right solution.

The problem is the radioactive waste being produced so a solution that is specific to this problem should suffice. That solution would be the provision of the nuclear plant with plans to properly dispose of the waste.

Should this happen, the nuclear plant can still stay in the same area and keep contributing to economic growth without adversely affecting people's heath.

Answer: yup the correct answer is c

Explanation:

Answer:

D

Explanation:

Answer:d

Explanation:

N - 7 - 1s2 2s2 2p3

O - 16 - 1s2 2s2 2p6 3s2 3p4

Mn - 25 - 1s2 2s2 2p6 3s2 3p6 4s2 3d5

Ga - 31 - 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1

Answer:

I think it's true. But I'm not sure

Answer:

True

Explanation:

Answer:

gene

Explanation:

Answer:

C

Explanation:

The concept behind, is mole ratio of Al:FeO

Answer:

Giant covalent are characterized by having high melting and boiling points as well as being solid at room temperature. Hence, option C is correct.

A covalent bond shares one or more pairs of electrons between two atoms.

Giant covalent structure:

Polythene: long chains of atoms that are able to rotate along the bonding axis.

Graphite: layers of (hexagonal) carbon sheets; each individual sheet are rigid (allows no rotation.)

Silicon dioxide: three-dimensional (tetrahedral) network of carbon and oxygen atoms; the entire network is very rigid (allows no rotation.)

Diamond: three-dimensional (tetrahedral) network of carbon atoms and is very rigid.

Hence, giant covalent are characterized by having high melting and boiling points as well as being solid at room temperature.

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Answer:

Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.

Explanation:

Hope this helps :)

(didn't get this from the internet)