Initial Phenomena Question: Magnesium metal reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas; how can you prove that?

Answers

Answer 1

Answer:

See explanation

Explanation:

The reaction equation is as follows;

Mg(s) + 2HCl(aq) -------> MgCl2(aq) + H2(g)

Firstly, the appearance of bubbles of gas shows that a gas is evolved in the reaction.

Secondly,  If we  hold up the flame of a butane fireplace lighter above the appearing hydrogen bubbles, we will hear audible pops as the hydrogen gas ignites showing that a combustible gas is produced in the reaction.

Lastly, as the reaction proceeds, the magnesium ribbon disappears as MgCl2 is formed. If a set up such as the image attached is used, hydrogen gas is collected over water.

Image credit: RSC education

Initial Phenomena Question: Magnesium Metal Reacts With Hydrochloric Acid To Produce Magnesium Chloride

Related Questions

Write a balanced chemical equation describing the oxidation of the bromide ion by solid xenon trioxide to produce bromine liquid and xenon gas in an acidic aqueous solution. Use the smallest whole-number coefficients possible.

Answers

Answer:

6Br⁻ + XeO₃ + 6H⁺ → 3Br₂ + Xe + 3H₂O  

Explanation:

First, we need to write the half-reactions:

2Br⁻ → Br₂ + 2e⁻ Oxidation -Balanced yet-

XeO₃ →  Xe Reduction

To balance the reduction in acidic aqueous solution we need to add waters in the other side of the reaction as oxygens are present:

XeO₃ →  Xe + 3H₂O

And H⁺ as hydrogens from water we have:

XeO₃ + 6H⁺ →  Xe + 3H₂O

To balance the charge:

XeO₃ + 6H⁺ + 6e⁻ →  Xe + 3H₂O  Reduction -Balanced-

To cancel out the electrons of both half-reaction we need to multiply oxidation 3 times:

6Br⁻ → 3Br₂ + 6e⁻

XeO₃ + 6H⁺ + 6e⁻ →  Xe + 3H₂O  

And the balanced reaction in acidic aqueous solution is the sum of both half-reactions:

6Br⁻ + XeO₃ + 6H⁺ → 3Br₂ + Xe + 3H₂O  

What is the differecn between Clo2 And Clo-2​

Answers

Answer:

- ClO₂: it is chlorine dioxide.

- ClO₂⁻: it is the chlorite ion.

Explanation:

Hello!

In this case, since Cl stands for chlorine and O stands for oxygen, being the first compound an oxide and the second one an ion, we can reason:

- ClO₂: it is chlorine dioxide and as its name indicates it, it is an oxide with neutral charge, actually, a molecular compound formed by one chlorine atom and two oxygen atoms.

- ClO₂⁻: it is the chlorite ion in which chlorine has +3 as the oxidation state and therefore it is not neutral but negative as it is ready to bond with a positive ion (cation).

Best regards!

In which food or drink are the particles most likely moving the fastest? Answers they gave to us: popsicle, cheese, a drink, Coffee. Please help me please i will give you a 5 star.

Answers

Answer:

Coffee

Explanation: When a liquid is warm the particles move faster

HELP PLEASE I NEED HELPPPPPPPPPPPPPPPPPPPPPPPPP

Answers

Answer:

B.

Explanation:

If it's coming from the south and pushing it north then it'll speed up the marble

Iodine-131 is a radioactive material that plays a role in natural gas production and has a half-life of 8 days. A 320-mg sample of iodine-131 will decay to 250 mg after approximately days.

Answers

Time of decays approximately 2.853 days

Further explanation

Given

mass = 320mg iodine-131

No=320 mg

Nt=250 mg

t1/2 = 8 days

Required

t=time of decays

Solution

General formulas used in decay:  

[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]

Input the value

[tex]\tt 250=320.\dfrac{1}{2}^{t/8}\\\\log\dfrac{25}{30}=t/8.log~0.5\rightarrow t=2.853~days[/tex]

4. What is valency? Explain different types of
valencies​

Answers

Answer:

Valency is the combining power of an element.

There are two types of valency - Electrovalency and Covalency.

Electrovalency: It is equal to the number of electrons lost or gained by atom to form ion.Covalency: It is the number of electron taking part in the formation of shared pairs.

Hope it helps!<3

Which type of mutation can contribute to the development of many types of cancers

Answers

Answer:

The answer to this question is given below in this explanation section.

Explanation:

                       "mutation can contribute to the development of many types of cancers"

About genetic mutations:

There are the two basic type of genetic mutations

Acquired mutations:

These are the most common cause of cancer.They occur from damage to genes in a particular cell during a personal life.For example this could be a breast cell or a colon cell,  with the goes on to divide many times and form a tumor.A tumor is an abnormal mass. Cancer that occurs because of acquired mutations are not found in every cell in the body and they are not passed from parent to child.

Factors that causes these mutations include:

TobaccoUltraviolet radiationvirusesAge

Germ line mutations:  

These are less common.A germ line mutations occurs in a sperm cell or egg cell.It passes directly from a parent to a child at the time of conception.As they embryo grows into a baby,the mutation from the initial sperm or egg cell is copied into every cell within the body.Because the mutation effects reproductive cells,it can pass generation to generation.Cancer caused by germ line mutations is called inherited cancer. it accounts for about 5% to 20% of all cancers.

Mutations and cancer:

A mutation may be harmful beneficial or neutral.This depends where in the gene the change occurs.Typically the body corrects most mutations.A single mutations will likely not cause cancer.

Types of genes like a cancer:

Many of the genes that contribute to cancer development fall into board categories.

Tumors suppressor genes:

These are protective genes. Normally they limit cell growth by:

Monitoring how quickly cell divide into new cellsRe-paring mismatched DNAControlling when a cell dies

Middle School Science help please. ill give brainliest

Answers

Answer:

its c

Explanation:

What is the percentage of the actual yield of the reaction of 2.5 mol of Fe(NO3),
with 3.6 mol of Na2Co3, to form 6.3 mol of NaNO3 according to the reaction :
2Fe(NO3)3 + 3NaC03 - >
Fe2(CO3)3 + 6NaNO3 ?​

Answers

Answer:

Percent yield = 87.5%

Explanation:

Given data:

Number of moles of Fe(NO₃)₃ = 2.5 mol

Number of moles of Na₂CO₃ = 3.6 mol

Actual yield of NaNO₃ = 6.3 mol

Percent yield of NaNO₃ = ?

Solution:

Chemical equation:

2Fe(NO₃)₃ + 3Na₂CO₃        →     Fe₂(CO₃)₃ + 6NaNO₃

now we will compare the moles of both reactant with NaNO₃.

                   Fe(NO₃)₃          :              NaNO₃

                       2                   :                  6

                     2.5                  :            6/2×2.5 = 7.5

                  Na₂CO₃             :              NaNO₃

                       3                   :                  6

                     3.6                  :            6/3×3.6 = 7.2

Theoretical yield of NaNO₃ is 7.2 mol.

Percent yield:

Percent yield = actual yield / theoretical yield ×100

Percent yield = 6.3 mol / 7.2mol ×100

Percent yield = 87.5%

Cl2 + 2Na → 2NaCl How many grams of NaCl are produced by the reaction of 0.300 L of chlorine gas at STP with excess sodium?

Answers

Answer:

1.52 g of NaCl

Explanation:

We'll begin by calculating the number of mole of chlorine gas (Cl₂) that occupied 0.3 L at STP. This can be obtained as follow:

Recall: 1 mole of any gas occupy 22.4 L at STP.

1 mole of Cl₂ occupy 22.4 L at STP.

Therefore, Xmol of Cl₂ will occupy 0.3 L at STP i.e

Xmol of Cl₂ = 0.3 / 22.4

Xmol of Cl₂ = 0.013 mole

Thus, 0.013 mole of Cl₂ occupied 0.3 L at STP.

Next, we shall determine the number of mole of NaCl produced from the reaction.

Cl₂ + 2Na —> 2NaCl

From the balanced equation above,

1 mole of Cl₂ reacted to produce 2 moles of NaCl.

Therefore, 0.013 mole of Cl₂ will react to produce = 0.013 × 2 = 0.026 mole of NaCl.

Thus, 0.026 mole of NaCl is produced.

Finally, we shall determine the mass of the NaCl. This can be obtained as follow:

Mole of NaCl = 0.026 mol

Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol

Mass of NaCl =?

Mole = mass /Molar mass

0.026 = mass of NaCl / 58.5

Cross multiply

Mass of NaCl = 0.026 × 58.5

Mass of NaCl = 1.52 g

Therefore, 1.52 g of NaCl were produced from the reaction

This giving, (or receiving or sharing) of electrons is called a bond.

So the bigger atoms (at the bottoms of Groups 1 and 2) in the first groups of the Periodic Table lose their outer electrons more easily forming bonds with nonmetals. This kind of bond is called an ______________ bond.

Answers

Answer:

Covalent bond

Explanation:

I am pretty sure this is the answer

2.
Which provides evidence for evolution?
A. modern organisms closely resembling fossils
B. different animals developing with the same patterns
C. multiple species growing in very different ways
D. different animals having very different body structures

Answers

Answer:

A. modern organisms closely resembling fossils

Explanation:

Fossils are defined as the preserved remains or traces of living organisms from past.

Fossils are considered as an evidence for evolution because they represent the existence of life on earth and shows the difference between the life in past that life on earth today. With the help of fossil, it is easy to determine the age of fossils which further help to determine that how modern organisms have evolved from the past.

Hence, the correct answer is "A. modern organisms closely resembling fossils".

Over time the Mexican-Free Tailed bat has evolved to be able to echolocate in the dark to find prey. Bats are able to see, but do not have very good vision
and rely on echolocation
The bats have developed the skill of echolocation in response to a lack of which of the following abiotic factors?
O oxygen
O water
O plants
Olight



Pls Help I’ll give brainly

Answers

Answer:

Light

Explanation:

1 They were not albe to see at night because it  was dark so the lack of light caused them to use echolocation.

Hope this helps

What is the speed of a car that moves 12 meters in 3 seconds? (Don't forget the unit!)

Answers

Answer:

8.9 mph

Explanation:

How can you avoid the formation of a supersaturated solution?

Answers

How to make super saturated solution?

An aqueous solution can be rendered supersaturated by first dissolving the solute in water at an elevated temperature using enough to give a concentration just under its solubility at that temperature. After the last of the solute crystals have dissolved the solution is cooled.

Answer:

By adding water i guess

25% While standing in line, a student notices that some students are really tall, some are approximately her height, and others are very short. From her observations, what could be a logical inference for the variations in height? A The tall students are taking growth steroids. B The short students are not eating the proper foods. с The height of the students is inherited from their parents. D The height of the students cannot be determined from the observations. 9 > E​

Answers

Answer:

b

Explanation:

the answere is b

7. Explain why ethylated spirit at room temperature when dropped at the back of the palm makes
the palm to feel very cold.
(2 Marks)​

Answers

Answer:

Evaporation is very important in the cooling of surfaces. If we put a drop of methylated spirit on our hand the methylated spirit will soon evaporate and our hand feels cold. The molecules of methylated spirit get the energy they need from our hand, leaving the molecules of the hand with less energy and so colder.

The ethylated sprit starts to evaporate from our hand. Evaporation is an endothermic process thus, absorbs the heat energy from our hand make the surface cool.

What is an endothermic process?

An endothermic process is the one which absorbs energy from the surroundings to proceed. Thus, an endothermic process make the surroundings cool and make the reaction system hot.

The process which evolves heat energy is called an exothermic process. An exothermic reaction make the surroundings hot sometimes leads to explosion.

Evaporation is the process of conversion of a liquid substance into vapor form. This process needs energy to intake. Hence during evaporation, the heat energy is absorbed from the surroundings make there cool. This is just happening on our hand when sprit evaporates.

To find more on endothermic process, refer here:

https://brainly.com/question/29555731

#SPJ2

While exploring an ancient lava field, a geologist discovers a piece of granite that has a coating of soft, crumbling rust. What is the most likely explanation for this rust?

A.
Exposure to air has caused the iron-bearing minerals in the granite to oxidize.
B.
At some point in the past, a river flowed over the field, depositing the rust on top of the granite.
C.
Exposure to acid precipitation has worn away the granite's exterior, revealing its soft interior.
D.
Snails and fungi living in the lava field have secreted chemicals that reacted with the granite to form rust.

Answers

Answer:

A. Exposure to air has caused the iron-bearing minerals in the granite to oxidize.

Explanation:

The main cause of granite rust is a metal substance that remains in it's contact over a long period of time. As a result of a moist or wet environment, . a geologist discovers a piece of granite that has a coating of soft, crumbling rust.

Exposure to air has caused the iron-bearing minerals in the granite to oxidize.

Option A. is correct.

1. True or false ? Balanced forces cause a change in motion. How do you know this ?

2. True or false ? Unbalanced forces cause a change in motion? How do you know this ?

Answers

Answer:

1. False

Balanced forces would mean all forces acting upon an object would be equal. So there is no movement.

2. True

Unbalanced forces would mean there is a force acting upon a side of tge object, causing it to move in a direction.

7.
Which characteristic is comaon of developing countries?
A
B
C
D.
Slower growth rate
longer life expectancy
lower fertility rate
higher infant mortality

Answers

Slower growth rate is common characteristic of developing countries. Therefore, the correct option is option A.

What is developing countries?

A sovereign state that is considered to be developing has a less developed industrial base with an HDI that is lower than other nations. This term is not generally accepted, though. Furthermore, there is no consensus on which nations fall into this category.

Although the phrase "low and middle-income country" (LMIC) is sometimes used synonymously, it only relates to the economies of the nations. In accordance with gross national income per capita, the World Bank divides the world's economy into four categories: high, upper-middle, lower-middle, as well as low income countries. Slower growth rate is common characteristic of developing countries.

Therefore, the correct option is option A.

To know more about developing countries, here:

https://brainly.com/question/28741145

#SPJ2

The only naturally occurring isotopes of nitrogen are N-14 and N-15.
Based on the atomic mass of the element nitrogen on the Periodic Table, compare the relative abundances of the naturally occurring isotopes of nitrogen

Answers

Answer:

Isotope N–14 = 99%

Isotope N–15 = 1%

Explanation:

Let isotope A be N-14

Let isotope B be N-15

From the question given above, the following data were obtained:

For isotope A (N-14):

Mass of A = 14

Abundance of A = A%

For isotope B (N-15):

Mass of B = 15

Abundance of B = (100 – A%)%

Atomic mass of nitrogen = 14.01 amu

Thus, we can obtain the relative abundances of the naturally occurring isotopes of nitrogen as illustrated below:

Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100]

14.01 = [(14 × A%)/100] + [(15 × (100 – A%)/100]

14.01 = 0.14A% + 0.15(100 – A%)

14.01 = 0.14A% + 15 – 0.15A%

Collect like terms

14.01 – 15 = 0.14A% – 0.15A%

– 0.99 = – 0.01A%

Divide both side by – 0.01

A% = – 0.99 / –0.01

A% = 99%

Abundance of B = (100 – A%)%

Abundance of B = (100 – 99)%

Abundance of B = 1%

Thus, the relative abundances of the naturally occurring isotopes of nitrogen are:

Isotope N–14 = 99%

Isotope N–15 = 1%

Why the value of kf is greater than kb?

Answers

Answer:

Kf being the depression of freezing point constant in the equation:

change in temperature = Kf * molality

Kb being the elevation of boiling point constant in the equation:

change in temperature = Kb * molality

the constant is variable for each solvent.

Explanation:

What happens when Magnesium hydroxide is heated? (Decomposition)

Answers

Answer:

It will make magnesium oxide and water

Explanation:

Magnesium hydroxide has the chemical formula Mg(OH)2 and the molecular weight of 58.3197 g/mol. Its CAS number is 1309-42-8 and its density is 2.345 g/cm3. It decomposes when heated to 360 °C and forms the oxide, MgO.

How many joules are needed to change the temperate of 22g of water from 18°C to 33°C?

Answers

Answer:

Q =  1379.4 J

Explanation:

Given data:

Mass of water = 22  g

Initial temperature = 18°C

Final temperature = 33°C

Heat absorbed = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Specific heat capacity of water is 4.18 J/g. °C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 33°C - 18 °C

ΔT =  15°C

Q = 522 g ×4.18 J/g.°C× 15°C

Q =  1379.4 J

Which statement summarizes the law of superposition? A. The oldest rock is found in the bottom layer of a rock formation. B. The rarest elements are found in the lowest layer of a rock formation. O C. The densest layer of rock in a rock formation is the bottom layer. D. The top layer of rock in a rock formation is the oldest. SUBMIT e​

Answers

Answer:

A superposition says that the newest rocks are nearer to the surface and oldest are near the bottom

Answer:

A.

Explanation:

complete the sentence using oxalate, oxic or oxide
A binary ionic compound with the formula Feo
would be named iron(II)_____

Answers

Answer: oxide

Explanation:..

Place the following in order of increasing X-Se-X bond angle, where X represents the outer atoms 7) in each molecule. SeO2 SeCl6 SeF2
A) SeF2 SeO2< SeCl6
B) Seo2 C) SeF2 < SeCl6 SeO2
D) SeCl6 < SeF2 Se02

Answers

Answer:

SeCl₆ < SeF₂ <  SeO₂

Explanation:

To determine the order of the bond angle of the compound, we need to determine the hybridization of each compound given.

For:

SeO₂, The hybridization is sp² because the Se is doubly bonded to O at both sides and Se contains a lone pair of electrons.

SeCl₆, Se is attached to six different Cl atoms via a single bond in a hexagonal shape. Thus, SeCl₆ hybridization is sp³d²

SeF₂, Here, Se is singly bonded to F atoms on both sides and Se contains a lone pair of electrons. The hybridization is sp³

Therefore, the bond angle in sp² = 120°, sp³ = 109.8°, sp³d² = 90°

Hence, the order is:  SeCl₆ < SeF₂ <  SeO₂

what is the difference between cell and cellmembrane​

Answers

Answer:

So, a cell, in easiest terms, is "the building blocks of life". Without cells, humans, plants, animals, and anything else that has a cell would not be able to survive. Cells are extremely important to our bodies. Whereas a Cell Membrane is an organelle inside a cell. The Cell Membrane's job is to provide protection for the cell, as well as deciding which substances can enter and exit the cell.

I hope this helps!

How does the particle motion and behavior affect how a substance appears on a macroscopic level use the term solid liquid gas state of matter and particle motion in your answer

Answers

Answer:Long-term drug abuse changes areas in the brain that affect behavior, judgment, learning and memory

Explanation:

Which of the following factors affect the rate of weathering in an area?

A.
climate
B.
topography
C.
rock composition
D.
all of the above

Answers

Answer:

D

Explanation:

pretty sure D

Other Questions
Please help! Its Spanish conjugations 100gm of a 55% (M/M) nitric acid solution is to be diluted to 20% (M/M) nitric acid. How many liters of water should be added to the starting solution? Ruth is at the park standing next to a slide.Ruth is 5 feet tall, and her shadow is 3 feetlong. If the shadow of the slide is 7.5 feetlong, what is the height of the slide? Assumethe triangles are similar. Charla is finding points on a number line. A number line going from negative 9 to positive 9. Point A is between negative 2 and negative 1, point B is between negative 1 and 0, point C is between 0 and 1, point D is between 1 and 2. Which point could represent Two-thirds? A B C D What is m How many terms are in this expression? Whatare they?6x + 4y - 9Please help Lena makes home deliveries of groceries for a supermarket. Her only stops after she leaves the supermarket are at traffic lights and the homes where she makes the deliveries. The graph shows her distance from the store on her first trip of the day. Give the domain of the function and relate the domain to the relationship described how do you find the area of this problem Next year you have to choose your subject stream and you are confused. Write a letter to the school counsellor asking and inquiring about all the relevant information required for the choice of subjects they have to offer, the required marks cut-off and the future prospects that the subjects have to offer. 1) Graph the quadratic function given in standard form and identify the key features. Include at least 5 points on yourgraph.y = -x2 - 2x + 1Axis of Symmetry:Vertex:Y-intercept:Domain:Range: Which of the following established a system of federal courts below the Supreme Court?A. U.S. Constitution B. Bill of RightsC. Judiciary Act of 1789D. Marbury vs Madison Only last month did the men's and women's unemployment rates reach the same ______. Pla help me thank you will mark brainliest ~ Select the correct answer. Which function is the inverse of f(x)= x^2 16 if the domain is[tex]x \geqslant 0[/tex] Last year, Nancy bought a mountain bike for $570. Her bike has depreciated since she bought it. It is now worth $410. What percent did the value of Nancys bike depreciate over the past year? Round the the nearest whole percent. Please help I will give brainliest only to those who answer respectfully and the best answer I need a topic on standard deviation, I'm supposed to be teaching first graders how to do standard deviation I just dont have a topic that would relate to them, could you please give me one? PLEASE HELP ASAP!! Read the excerpt from Anne Frank: The Diary of a Young Girl:I am young and I possess many buried qualities; I am young and strong and am livinga great adventure; I am still in the midst of it and can't grumble the whole day long. Ihave been given a lot, a happy nature, a great deal of cheerfulness and strength.Every day I feel that I am developing inwardly, that the liberation is drawing nearerand how beautiful nature is, how good the people are about me, how interesting thisadventure is! Why then should I be in despair?Based on this passage, write a one paragraph description of Anne's viewpoint andtone, as well as the meaning of this text. Be sure to explain how specific languagewithin the text impacts reader understanding of her stance, attitude, and message.I am being timed please help!! PLEASE ANSWER THIS QUESTION RIGHT THE QUESTION IS ABOVE THE PICTURE Which of the following lists only the factors that would cause a decrease in the supply of an item? A. A fall in input prices; an increase in productivity, a fall in the price of a substitute-in-production. B. A rise in the price of a substitute-in-production; a rise in the price of a complement-in-production; an expectation that the price of the item will rise in the future. C. A decrease in the number of sellers in the market; a fall in the price of a complement-in-production; an increase in productivity. D. A rise in input prices, a decrease in the number of sellers in the market; a rise in the price of a substitute-in-production. Given m||n, find the value of x.+(8x-4)(6x-12) Steam Workshop Downloader