Balance The Equation SHOW WORK
H2 + O2 → H2O
Ca + O2 → CaO
Ca + HCl → CaCl2 + H2

Answer:

sodium sulfate

Explanation:

For naming an ionic compound with polyatomic anion, the metal is written first using its element name followed by name of the polyatomic anion. Therefore, the compound with Na+Na+ cation and SO2−4SO42− anion is named as sodium sulfate.

Answer:

Cenoizic

Precamborian

It provides the plant cell with structure and support, along with protection from bursting due to turgor pressure

Explanation:

Answer:

Explanation:

47 i took the test

Silver (Ag) has 47 protons, 60 neutrons, and 47 electrons in each atom. Based on this information, the mass number of the silver would be 107.

The total number of protons present in an atom is known as the atomic number of that atom. The atomic number has no correlation either with the number of neutrons or the number of electrons present inside an atom.

As given in the problem Silver (Ag) has 47 protons, 60 neutrons, and 47 electrons in each atom.

The atomic number of the silver =  number of protons

                                                     = 47

The mass number of the silver = number of protons + number of neutrons

                                                   =47 + 60

                                                   =107

Thus, based on the given information the mass number of the silver would be 107.

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The molar mass is given by the sum of the atomic masses of the component elements of the substance.

In our case, the substance is ethanol or C₂H₅OH.

[tex]A_C=12.011 [/tex]

[tex] A_H=1.0079 [/tex]

[tex] A_O=15.9994[/tex]

[tex]\mathcal M_{C_2H_5OH} = 2 \times A_C + 6 \times A_H + A_O = 2 \times 12.011 + 6 \times 1.00079+ 15.999 4= 24.022 + 6.0474 + 15.9994= 46.069≈ \boxed{46.07 \dfrac{g}{mol}}[/tex]

The empirical formula : MnO₂.

Given

632mg of manganese(Mn) = 0.632 g

368mg of oxygen(O) = 0.368 g

M Mn = 55

M O = 16

Required

The empirical formula

Solution

You didn't include the pictures, but the steps for finding the empirical formula are generally the same

Mn : 0.632 : 55 = 0.0115

O : 0.368 : 16 =0.023

Mn : O =

[tex]\tt \dfrac{0.0115}{0.0115}\div \dfrac{0.023}{0.0115}=1\div 2[/tex]

The empirical formula : MnO₂

Answer:

2 valence electrons in shell 4 is ur ans

Answer:

Well if glaciers were to most likley melt wit would have a big affect on the world. But on Florida the affect would be as everybody would expect, a flash flood, with high water's and everything under water. AND there would most lilkley be something in the glacier. Not highly sure about it though

Explanation:

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Answer:

B - Covalent bonds

Explanation:

Covalent bonds are a class of chemical bonds where valence electrons are shared between two atoms, typically two nonmetals. The formation of a covalent bond allows the nonmetals to obey the octet rule and thus become more stable.

Answer:

The solution is acidic.

Explanation:

The nature of solution will be acidic.

A solution is just a uniformly dispersed mixture of more than solutes in a solvent.

In nature, chemical species with a pH value between. are termed acidic. Acidic substances have a sour flavor in general. In the beginning, acid was defined as a sour substance that interacts with metal as well as turns blue litmus red.

Calculation of pH.

Given data:

pOH = 12

The nature of the solution can be calculated by pH formula.

pH+ pOH = 14

Put the value of pOH in above expression.

pH = 14-pOH

pH = 14-12

pH = 2.

Hence, the nature of the solution will be acidic.

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Answer:

B) coefficient: subscript

Explanation:

Given

[tex]3H_2O[/tex]

Required

What does 3 and 2 represents

On a general term:

In [tex]nA_m[/tex]

[tex]n = The\ coefficient\ of\ A[/tex]

And

[tex]m = The\ subscript\ of\ A[/tex]

So, by comparing [tex]3H_2O[/tex] with the general term, [tex]nA_m[/tex]

[tex]n = 3[/tex]

[tex]m = 2[/tex]

Hence,

3 = coefficient and 2 = subscript

The correct answer is  A) coefficient: superscript.

[tex]3H_2O[/tex]

  In general:

[tex]2B_3[/tex]

2 is the coefficient of B, and 3 is the subscript of B.

 So, by comparing  with the given molecule, [tex]3H_2O[/tex]

3 = coefficient and 2 = subscript

Hence , the correct option is A.

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Answer:

As sodium and potassium both are alkali metals that belong to Group IA of the periodic table. They have one valence electron in their valence shell. As we move from top to bottom, the reactivity of metallic elements of Group IA increases.

yes both B and D are correct

Catalysts lower the activation energy of the reaction therefore, the rate of reaction will increase. Therefore, option B, D are correct.

Catalysis can be defined as the process of enhancing the rate of a reaction by adding a substance or chemical compound known as a catalyst. Catalysts are usually not consumed in the chemical reaction and can be recovered unchanged after the completion of the reaction.

The catalyst can be recycled quickly, and little amounts of catalysts are sufficient for mixing, temperature, and surface area are factors in the reaction rate. The catalyst reacts with one or more reactants to generate intermediates that provide the final product.

The addition of a catalyst can lower the activation energy of reactant molcules, therefore, increasing the rate of the reaction. Because catalysts increase in frequency the successful collision as more reactant molecules have activation energy.

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Batteries come in all shapes and sizes, and depending on the type of battery, the minerals that compose them are mainly lithium, cobalt, graphite, nickel and manganese.

Explanation:

the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table

Answer:A

Explanation: reactants: Na2SO4 and SrCl2

Products: NaCl and SrSO4

Answer:

Radioactive

Explanation:

:D

Answer:

c-Radioactive

Explanation:

Answer: C. Number of valence electrons

Explanation: A group is a vertical column in the periodic table, which signifies the number of valence shell electrons in an element's atom. Example: all the elements in group 1 have 1 electron in their outer most shell.

Answer:

I think it's D

Explanation:

Answer:

I hope it helps u

Explanation:

The advantages of using natural gas rather than coal are the following,

Moles in the container : 0.306

Given

30 g of H3PO4

Required

moles in container

Solution

A mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12  

1 mole = 6.02.10²³ particles  

While the number of moles can also be obtained by dividing the mass (in grams) with the molar mass of element or molecule  

MW of H3PO4 = 3.1 + 31 + 4.16 = 98 g/mol

mol = mass : MW

mol = 30 : 98

mol = 0.306

Answer:

512g, 25%

Explanation:

H_2+I_2→ 2HI

3 moles H_2× 2moles HI/1 mole of H_2= 6 moles of HI

2moles I_2×2 moles of HI/1 mole of I_2= 4 moles of HI

Now, theoretical yield of HI = 4 moles ×128 g/ mole = 512 g

percentage yield = (128g/512g)×100 = 25%

Answer:

P₂ = 1.05 atm

Explanation:

Given data:

Initial temperature = 24.0 °C (24+273 = 297 K)

Initial pressure = 0.900 atm

Final pressure = ?

Final temperature = 75 °C (75 + 273 =348 K)

Volume = constant

Solution:

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

0.900 atm / 297 K = P₂/348 K

P₂ = 0.900 atm × 348 K / 297 K

P₂ = 313.2 atm. K /297 K

P₂ = 1.05 atm

Answer:

Sunlight

Explanation:

Sunlight is always neccesary in photosynthesis

Answer:

Carbon Dioxide + Water + Sunlight → Glucose + Oxygen.

Explanation:

Answer:

15.6 g

Explanation:

Given that;

Mass of original sample = No = 500g

mass of sample remaining at 910 ms = N = ?

time taken to decay= 910 ms

Half life of Ca-37 = 181 milliseconds

From;

N/No = (1/2)^t/t1/2

N/500 = (1/2)^910/181

N/500 = (1/2)^5

N/500 = 1/32

32 N = 500

N = 500/32

N = 15.6 g

Lm/aooooo was that supposed to be a quesadilla?

Answer:

why it just a mistake everyone make a mistake i belive in you.

Explanation:

Answer : The correct symbol and charge for each of the ions must be [tex]Na^{+1}[/tex] and [tex]Cl^{-1}[/tex].

Explanation :

The covalent compound are usually formed when two non-metals react.

Ionic compound are usually formed when a metal reacts with a non-metal.

As we know that the sodium chloride is an ionic compound in which sodium is an alkali metal and has one valence electron and chlorine is a non-metal and has 7 valence electrons.

When sodium atom donates an electron to a chlorine atom then it forms an ionic compound that is sodium chloride (NaCl) and the resulting positive ion [tex]Na^{+1}[/tex] and negative ion [tex]Cl^{-1}[/tex] form a stable ionic compound.

Hence, the correct symbol and charge for each of the ions must be [tex]Na^{+1}[/tex] and [tex]Cl^{-1}[/tex].

Explanation:

When zinc reacts with dilute hydrochloric acid, it is a metal-acid reaction to produce zinc chloride and hydrogen gas.

Zn (s) + 2HCl (aq) => ZnCl2 (aq) + H2 (g)

Ionic equation:

Zn2+ (aq) + 2Cl- (aq) => ZnCl2 (aq)

The word mole is one of those crazy words that have multiple meanings that can sometimes lead to confusion. Perhaps your first thought after hearing the word is a cute little animal that burrows in the ground.

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