phương trình nào sau đây không đúng
Mg(OH)2 (t°)→ MgO+H2O
Fe(OH)2 (t°,chân không)→FeO+H2O
2Fe(OH)3 (t°)→Fe2O3+3H2O
2NaOH (t°)→Na2O+H2O

Answers

Answer 1

Phương trình NaOH sai nha


Related Questions

Balance the following chemical equations.
Fe + H2S04 ------->Fe2(SO4)3 + H2
C2H6 + O2-------> H2O + CO2
KOH + H3PO4 ------->K3PO4 + H2O
SnO2 + H2-------> Sn + H2O
NH3 + O2 ------->NO + H2O
KNO3 + H2CO3-------> K2CO3 + HNO3
B2Br6 + HNO3 ------->B(NO3)3 + HBr
BF3 + Li2SO3 ------->B2(SO3)3 + LiF
9. (NH4)3PO4 + Pb(NO3)4-------> Pb3(PO4)4 + NH4NO3
SeCl6 + O2 ------->SeO2 + Cl2

Answers

Answer:

fe oo andffffe

aiejand iefjwe

eekkfwefwe f

opw fwfwfew

efefwefwefwi

Explanation:

Write the empirical formula for the hydrated KAl(SO4)2, based on your experimental results and answer to Question 2. Show all work including units.
Hint: if the ratio of moles of H2O to moles of anhydrous KAl(SO4)2 was 4, then the empirical formula would be: KAl(SO4)2•4H2O.

Answer to Question 2:
Ratio of 2:3

Answers

Answer:

Therefore mole ratio is [tex]H_{2}O[/tex] : [tex]KAl(SO_{4} )_{2}[/tex] is 12 :1  

Empirical formula is [tex]KAl(SO_{4} )_{2}. 12 H_{2}O[/tex].

Explanation:

The chemical formula of a hydrate  

Moles of anhydrous [tex]KAl(SO_{4} )_{2}[/tex]  

Molar mass of [tex]KAl(SO_{4} )_{2}[/tex] = 258.21 g /mol  

Mass of anhydrous [tex]KAl(SO_{4} )_{2}[/tex] = [mass of aluminum cup + alum after 2nd heating] –[ mass of empty cup]  

                                                   = 3.5 g – 2.4 g  

                                                   = 1.1 g

Moles of [tex]KAl(SO_{4} )_{2}[/tex]= mass / molar mass  

                                    = 1.1 g / 258.21 g per mol  

                                   = 0.00426 mol [tex]KAl(SO_{4} )_{2}[/tex]

The mole ratio of the H2O to [tex]KAl(SO_{4} )_{2}[/tex]

Mole ratio = moles of H2O/ moles of [tex]KAl(SO_{4} )_{2}[/tex]

                  = 0.05 mol H2O / 0.00462 mol [tex]KAl(SO_{4} )_{2}[/tex]

                 = 11.7

We can round the 11.7 to closest whole number = 12

Therefore mole ratio is [tex]H_{2}O[/tex] : [tex]KAl(SO_{4} )_{2}[/tex] is 12 :1  

Empirical formula = [tex]KAl(SO_{4} )_{2}. 12 H_{2}O[/tex]  

So we have 12 moles of water as the water of hydration in the empirical formula.  

Alum hydrate is that the white crystalline solid after heating it'll start melting due to the water of hydration present in it then again solid will remain within the aluminum cup once all the water is given off within the sort of vapors.  

b) if the scholar used 2.20 g of the sample but within the calculation, he started with 2.0 g sample then  

when the mass of water is calculated using this data the mass of water is going to be higher therefore it gives more moles of water within the hydrate.  

So the final answer is going to be artificially high.

How long does it take, on average, for one centimetre of soil to form

Answers

The time needed to form a soil depends on the latitude: in environments characterized by a mild climate, it takes 200-400 years to form 1 cm of soil. in wet tropical areas soil formation is faster, as it takes 200 years. in order to accumulate enough substances to make a soil fertile it takes 3000 years.

Which of the following is an oxide which is strongly acidic?
(a) Na2O.
(b) MgO
(c) SiO2.
(d) P2O5.

Answers

Answer:

answer of your question is 4th

Explanation:

P205

Help me please

The options are
A. Translation
B. Rotation
C. Enlargement
D.reduction

Answers

this is enlargement since the new image has been enlarged twice the size of the original.

translation means it has moved
rotation means it turned another way
reduction means it got smaller

Answer:

C. Enlargement

Explanation:

Which of the following are true for an element?       (i)Atomic number= number of protons + number of electrons      (ii)Mass number = number of protons+ number of neutrons      (iii)Atomic mass= number of protons= number of neutrons      (iv)Atomic number = number of protons = number of electrons​

Answers

Answer:

ii and iv

Explanation:

atomic mass is the sum of protons and neutrons

protons ( postively charged) usually have the same number like electrons( negatively charged)

Draw the structure for :

3,3,4-trimethylhex-2-ene

Answers

Answer:

answer is in the picture.

Had beryllium and calcium already been discovered

Answers

Answer:

Yes

Beryllium is a chemical element with the symbol Be and atomic number 4. It is a steel-gray, strong, lightweight and brittle alkaline earth metal. ... Notable gemstones high in beryllium include beryl (aquamarine, emerald) and chrysoberyl.

Calcium is a mineral that is necessary for life. In addition to building bones and keeping them healthy, calcium enables our blood to clot, our muscles to contract, and our heart to beat. About 99% of the calcium in our bodies is in our bones and teeth.

write electronic configuration of chlorine in its ionic state?​

Answers

Answer:

1s2 2s2 2p6 3s2 3p6

Explanation:

Chlorine is a groups 17 element. The halogens for ions by accepting one electron to form univalent negative ions.

Since chlorine normally contains seventeen electrons, the chloride ion consists of eighteen electrons.

Hence the electronic configuration of chlorine ion is; 1s2 2s2 2p6 3s2 3p6.

Which of the following about a balanced chemical reactions is
NOT true?
O A properly written chemical equation will include the states of matter
for every substance in the reaction.
O The number of atoms of each element must be the same for both
reactants and products.
A balanced chemical equation must follow the Law of Conservation
of Matter
A balanced chemical equation must always include coefficients on
every reactant and product.

Answers

Answer:

A balanced chemical equation must always include coefficients on every reactant and product.

Explanation:

A balanced chemical equation does not need to include coefficients on every reactant and product.

For example, below is a balanced chemical equation in which the reactants and the products have no coefficients whatsoever:

NaOH(aq) + HCl (aq) -----> NaCl (s) + H2O (l)

Of course, a properly written chemical equation must include the states of matter of all the substances in the reaction and the number of atoms of each element must balance both in the reactant and product sides of the equation. Generally, a balanced chemical equation must obey the law of conservation of matter which opines that matter can neither be created nor destroyed but can only be converted from one form to another.

Hence, that a balanced chemical equation must always include coefficients on every reactant and product is not true.

Which of the following elements would have the largest electronegativity value?
O cesium
Olithium
O carbon
O sodium

Answers

I’m going to go with lithium

The acid dissociation constant, Ka, of HSO4- is 1.2 × 10-2. What does the Ka value indicate about this compound?
A.
HSO4- is a weak base.
B.
HSO4- is a strong acid.
C.
HSO4- is a weak acid.
D.
HSO4- is a strong base.

Answers

Answer:

The answer is HSO4- is a weak acid which will be C

The acid dissociation constant, ka, of HSO4- indicates that it is a strong acid. Details about acid dissociation constant can be found below.

What is acid dissociation constant?

The acid dissociation constant denoted by Ka is the measure of the strength of an acid.

The dissociation constant of an acid is used to identify strong acids from their weak counterparts. Strong acids have high Ka values while weak acids have low Ka values.

According to this question, the Ka of HSO4- is 1.2 × 10-², which is quite high.

Therefore, the dissociation constant, ka, of HSO4- suggests that it is a strong acid.

Learn more about acid dissociation constant at: https://brainly.com/question/4363472

#SPJ9

balance the equation .......qn 5.......help​

Answers

Answer:

MnO4 + 4 H2C2O4 = Mn + 8 CO2 + 4 H2O

ii.
ci
What is the name of the organic compound

Answers

hydroxyl, carboxyl, amino, methyl and phosphate groups

Answer.

Hydrocarbons are compounds that contain carbon and hydrogen only

Explanation:

a. c3H4 methane

b.c3H4.propene

c.c5H8

Element 'X' forms a chloride with the formula XCl2, which is a solid with high melting point. X would most likely be in the same group of the periodic table as:

I) Si
2) Al
3) Mg
4) Na



pls pls answer fast ​

Answers

Answer:

Mg

Explanation:

Mg forms 2+ ions and mgcl2 has a melting point over 700°C I believe.

Determine which elements or compounds are products in the
follow reaction equation:

Answers

Answer: D is the answer since it is the product of this equation

Explanation: HOPE I AM RIGHT AND IT HELPS!!!

need more explanation feel free to comment in the comment box

If a quantity of this substance existed as a solid at a pressure of 0.75 atm and a temperature of 50°C, what phase
change(s) would occur if the temperature increased to 500°C?
a. Freezing and deposition
b. Melting and freezing
c. Condensation and sublimation
d. Melting and vaporization

Answers

Possibly d or could be a

Rank these solutions from the most alkaline (1) to the least alkaline (5).

Answers

I think the answers are 45 and 60

phosphorus react with carbon

Answers

Answer:

Phosphorus atoms can bond with oxygen atoms to form ester groups. These can bond with carbon atoms, yielding a large number of organic phosphorus chemicals. These are found in many important biological processes

Cuál es tejidos conforman el sistema de tejido fundamental

Answers

Explanation:

Los tejidos que conforman el tejido fundamental son los siguientes:

-Parénquima

-Colénquima

-Esclerénquima.

El tejido fundamental constituye la parte principal del cuerpo de la planta porque intervienen en funciones tan importantes para el desarrollo  y sostenimiento de la planta como el proceso de  la fotosíntesis, el almacenamiento de agua y  de  nutrientes .

please help me with this

Answers

Answer:

a. B

b. C

c. A

d. A

e. B

f. -266

g. B and D

Explain the steps you would follow to make 500 mL of a 0.3 M solution of sucrose
(C12H22011) in the lab.

Answers

Answer:

see explanation

Explanation:

Solutions are prepared from one of three solute sources ...

- solid solute from manufacturer,

-liquid solute from manufacturer,

-stock concentrate of solute for dilution to lower concentrations.

In this problem, sucrose is a stock solid with a formula mass of 342.3 grams/mol. The amount of solid needed can be determined using the formula:

mass of solute needed (grams) = (Molarity needed x Volume needed in Liters x formula weight) / (decimal fraction purity of stock solid)

Molarity needed = 0.3M

Volume needed = 500 ml = 0.500 liters

Formula weight = 342.3 grams/mole

Purity factor (assumed) = 100% = 1.00 (should be posted on stock bottle label) For example, a 95% pure stock solid => purity factor of 0.95.

∴ grams of sucrose needed = (0.3M*)(0.500L)(342.3g/mole)/(1.00) =51.345 grams sucrose.

Measure 51.345 grams of sucrose into mixing vessel and add solvent water up to, but not to exceed 500 ml total volume. Mix until homogeneous.

How many Calcium (CA) atoms are in carbon tetrachloride​

Answers

Answer:

5

Explanation:

Carbon tetrachloride has molecular formula as  CCl4 , so from this it is evident that there are 4 atoms of Chlorine & 1 atom of carbon is present, in total 5 molecules are present in carbon tetra

Answer:

its 5

Explanation:

Now look at the volcano map what type of boundary tends to give rise to volcanic activity

Answers

divergent and convergent plate boundaries cause volcanic activity

Answer:

Volcanoes occur primarily on convergent boundaries, specifically oceanic-continental convergent boundaries.

Explanation:

plato

What is the name of the compound with the formula B2C14?​

Answers

Answer:

Diboron tetrachloride --->  B2Cl4

How many moles of electrons is required to deposit 5.6g of iron from a solution of iron (2) tetraoxosulphate(6)

Answers

Answer:

0.20 mol

Explanation:

Let's consider the reduction of iron from an aqueous solution of iron (II).

Fe²⁺ + 2 e⁻ ⇒ Fe

The molar mass of Fe is 55.85 g/mol. The moles corresponding to 5.6 g of Fe are:

5.6 g × 1 mol/55.85 g = 0.10 mol

2 moles of electrons are required to deposit 1 mole of Fe. The moles of electrons required to deposit 0.10 moles of Fe are

0.10 mol Fe × 2 mol e⁻/1 mol Fe = 0.20 mol e⁻

0.20 mol of electrons is required to deposit 5.6g of iron from a solution of iron (2) tetraoxosulphate(6)

 The reduction of iron from an aqueous solution of iron (II).

[tex]Fe^{+2} +2e^{-} \rightarrow Fe[/tex]

The formula for number of moles is as follows:-

[tex]Number \ of \ moles=\frac{Mass}{Molar\ mass}[/tex]

The molar mass of Fe is 55.85 g/mol. The moles corresponding to 5.6 g of Fe are:

[tex]5.6 g \times\frac{1\ mol}{55.85\ g} = 0.10 \ mol[/tex]

2 moles of electrons are required to deposit 1 mole of Fe. The moles of electrons required to deposit 0.10 moles of Fe are:-

[tex]0.10 mol Fe\times\frac{2\ mol\ e^{-} }{1\ mol\ e^{-}} = 0.20 \ mol e^{-}[/tex]

Hence, 0.20 mol of electrons is required to deposit 5.6g of iron.

To know more about:-

brainly.com/question/12513822

hii pls help me to balance chemical equation

calcium hydroxide + hydrochloric acid ------> calcium chloride + water​

Answers

Answer:

1 Ca(OH)2 + 2 HCl ---> 1 CaCl2 + 2 H2O

¿Que es bacteria y un virus ?
es para hoy por favor ayúdeme

Answers

i) Las bacterias son organismos microscópicos unicelulares que prosperan en diversos entornos. Estos organismos pueden vivir en el suelo, el océano y dentro del intestino humano.

ii) Un virus es un agente infeccioso submicroscópico que se replica solo dentro de las células vivas de un organismo. Los virus infectan todas las formas de vida, desde animales y plantas hasta microorganismos, incluidas bacterias y arqueas.

Los antibióticos solo son necesarios para tratar ciertas infecciones causadas por bacterias. Las enfermedades virales no pueden tratarse con antibióticos. Cuando tomar antibióticos no sea lo indicado, pídale a su profesional de atención médica consejos sobre cómo aliviar los síntomas y sentirse mejor.
Enfermedad común
Causa común
¿Se necesitan antibióticos?
Bacteria
Bacteria o virus
Virus
Infección estreptocócica de la garganta (strep)

Tosferina

Infección de las vías urinarias

Sinusitis
Tal vez
Infección del oído medio
Tal vez
Bronquitis/resfriado con congestión de pecho (en niños y adultos)*
No*
Resfriado común/moqueo
No
Dolor de garganta (excepto por infección estreptocócica)
No
Influenza (gripe)
No

PLZ HELL ME WITH MY WORK​

Answers

Answer:

Ba

Explanation:

Consider the half reactions below for a chemical reaction.
ZnZn2+ (aq) + 2e
Cu?" (aq) + 2e → Cu(s)
What is the overall equation for this chemical reaction?
Zn(s)+ Cu?* (aq) —>Zn2+ (aq) + Cu(s)
O Zn(s) + Cu2+ (aq) — Cu2+ (aq) + 2e-
O Zn2*(aq) + Cu(s) —> Cu2* (aq) + Zn(s)
O Zn2+ (aq) + 22 —> Cu2(aq) + 2e

Answers

Answer:

Option A:

Zn(s) + Cu^(2+) (aq) → Cu(s) + Zn^(2+)(aq)

Explanation:

The half reactions given are:

Zn(s) → Zn^(2+)(aq) + 2e^(-)

Cu^(2+) (aq) + 2e^(-) → Cu(s)

From the given half reactions, we can see that in the first one, Zn undergoes oxidation to produce Zn^(2+).

While in the second half reaction, Cu^(2+) is reduced to Cu.

Thus, for the overall reaction, we will add both half reactions to get;

Zn(s) + Cu^(2+) (aq) + 2e^(-) → Cu(s) + Zn^(2+)(aq) + 2e^(-)

2e^(-) will cancel out to give us;

Zn(s) + Cu^(2+) (aq) → Cu(s) + Zn^(2+)(aq)

Other Questions
Write as an algebraic expression: *20% of 75% of y can someone help me with this? What is the range of the given data set? OA) 30 OB) 32 OC) 37 OD) 40 12. PLEASE HELP MEWhich of the following are the coordinates of the vertex of y= x2 - 10x + 2?A. (10, 2)B. (2, 10)C. (5, 23)D. (5, 23) TRIGONOMETRY Could someone please help me with 5.2 please...it would really help alot:) Can someone help me please One month Kaitlin rented 2 movies and 5 video games for total of $34. The next month she rented 8 movies and 3 video games for total of $51. Find the rental cost of each movie and each video game. How manyAssume that the mean hecaht of soldiers is 166cmwith a standard deration of 8. cm.soldeers in a regiment of 1000 would you expect tobe over 177 cm tall. A bio catalyst that increases the rate of the reaction without being changeda) Aluminum oxide. b) Silicon dioxide. c) Enzyme. d) Hydrogen peroxide43. What is thethan the reaction substrate.42. A Find the value of x round to the nearest tenth. Which statement describes Sparta's strategy for the Peloponnesian War?O Sparta used its navy to attack Athens along the coastline.O Sparta ruined Athens's farmland to try to get Athens to fight on land.O Sparta sailed around the peninsula to attack Athens from two sides.O Sparta attacked Athens directly and attempted to knock down the walls.Done5) Intro Find the center and radius of the circle. Write the standard form of the equation.(1,6) (10,6) In right triangle ABC, AB = 3 and AC = 9. What is the measure of angle B to the nearest degree? what is a cell and why it is necessary The materials price variance is the difference between the actual price of materials ______. Multiple choice question. and the standard price for materials with the difference multiplied by the standard quantity of material allowed and the standard price for materials with the difference multiplied by the actual quantity of materials times the actual quantity of materials and the standard price of materials times the standard quantity allowed for production What kind of art was being created during the Neolithic Age (New Stone Age) Brooke's aunt is considering putting her baby up for adoption, so she contacts a state-licensed adoption agency. The agency will be able to help her by doing all of the following EXCEPTA. assisting with hospital arrangements for the birthB. helping Brooke's aunt choose a family for the babyC. offering financial assistance for medical costsD. providing legal assistance during the process How is the poem different from the story? please help I will give you brainlist Find the equation of a line perpendicular to 8x - 2y = 4 and passes through the point (4, 3). What quality structures were built by native American Civilization in Mexico