When a mixture of iron powder and sulphur is heated it glows more brightly than that of iron filings and sulphur.Explain this observation

Answers

Answer 1

Answer:

I don't know

Explanation:

mixture of iron powder and sulphur heated it glows because sulphur and iron are more reactive metals that they shine and sulphur can react with water produce fire it's write


Related Questions

put some ice in a clean glass. examine it every 3 minutes for half oan hour . DIscribe what happens to the ice​

Answers

Answer:

the ice starts melting and turns into water

the ice would start melting more and more and at the end it would result into being water

A gas has the volume of 45mL at 25 C is heated to 50 C. What is the new volume of the gas? P1V1 = P2V2 V1/T1 = V2/T2 PV = nRT V1/T1 x V2/T2​

Answers

Answer:

Option b (V1/T1 = V2/T2) is the right alternative or the new volume will be "0.048 L".

Explanation:

The given values are:

Temperature,

T₁ = 25°C

or,

   = 298.15 K

T₂ = 50°C

or,

    = 323.15 K

Volume,

V₁ = 45 mL

or,

    = 0.045 L

V₂ = ?

As we know,

⇒  [tex]\frac{V_1}{T_1} =\frac{V_2}{T_2}[/tex]

Or,

⇒  [tex]V_2=\frac{V_1\times T_2}{T_1}[/tex]

On substituting the values, we get

⇒       [tex]=\frac{0.045\times 323.15}{298.15}[/tex]

⇒       [tex]=\frac{14.541}{298.15}[/tex]

⇒       [tex]=0.048 \ L[/tex]

please help me ;-; I need help grades are in tomorrow

Answers

Explanation:

Sorry i cant see the mass number of Lithium.

And fyi if the N in question refers to Neutron number, the answer is as i stated.

But, if the N refers to Nucleon number the answer is proton number + mass number

I need help on this 6th grader science plants.

Answers

Answer:

A - A fruit of vegetable will begin to grow

Which of the following statements concerning double covalent bonds is correct?
They are found only in molecules that contain S or O.
S
They are found only in molecules that contain a coordinate covalent bond.
They occur on y between atoms containing 4 valence electrons.
They involve tie sharing of 2 electron pairs.
t​

Answers

they involve tie sharing of 2 electrons pairs.

0.47 M KNO3 solution contains .757475 mol of KNO3 what is the volume

Answers

Answer:

Volume is the quantity of three-dimensional  

Explanation:

Where did water become gas?
F
E
Temperature (°C)
В
Time (minutes)
O A-B
OB-C
OE-F
OD-E

Answers

Answer: Water becomes gas at D-E.

Explanation:
In the flat line D-E water is absorbing energy to become gas, and when the water is completely gas, the temperature will increase again therefore the line will rise up.

2.a. 3.26 g of iron powder are added to 80.0 cm3 of 0.200 mol dm-3 copper(II)
sulfate solution. The following reaction occurs: Fe (s) + CuSO4 (aq) → FeSO4 (aq)
+ Cu (s)Determine the limiting reactant showing your working. *
Your answer

Answers

Answer:

The limiting reactant is CuSO₄.

Explanation:

The reaction is:

Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s)      (1)

To find the limiting reactant we need to find the number of moles of the reactants.

[tex] \eta_{Fe} = \frac{m}{A_{r}} [/tex]

Where:

m: is the mass of iron = 3.26 g  

[tex]A_{r}[/tex]: is the standard atomic weight of iron = 55.845 g/mol

[tex]\eta_{Fe} = \frac{3.26 g}{55.845 g/mol} = 0.058 moles [/tex]

[tex] \eta_{CuSO_{4}} = M*V [/tex]                

Where:

M: is the concentration of the CuSO₄ = 0.200 mol/dm⁻³

V: is the volume of the solution = 80.0 cm³

First, we need to convert the units of the volume to dm³ knowing that 1 dm = 10 cm and 1 L= 1 dm³.

[tex] V = 80.0 cm^{3}*\frac{1 dm^{3}}{(10 cm)^{3}} = 0.080 dm^{3} [/tex]

Now, the number of CuSO₄ moles is:

[tex] \eta_{CuSO_{4}} = M*V = 0.200 mol/dm^{3}*0.080 dm^{3} = 0.016 moles [/tex]            

So, to determine the limiting reactant we need to use the molar ratio from equation (1), Fe:CuSO₄ = 1:1

[tex]\eta_{Fe} = \frac{1 mol Fe}{1 mol CuSO_{4}}*0.016 moles \: CuSO_{4} = 0.016 moles[/tex]

Since we need 0.016 moles of Fe to react with 0.016 moles of CuSO₄ and initially we have 0.058 moles of Fe, then the limiting reactant is CuSO₄.  

Therefore, the limiting reactant is CuSO₄.  

I hope it helps you!

The limiting reactant would be CuSO4

Looking at the equation of the reaction:

Fe (s) + CuSO4 (aq) → FeSO4 (aq) + Cu (s)

The mole ratio of Fe to CuSO4 is 1:1. Thus, every 1 mole of Fe will require 1 mole of CuSO4 for reaction.

Recall that: mole = mass/molar mass

Also: mole = molarity x volume

mole of Fe = 3.26/55.8

                    = 0.058 moles

mole of CuSO4 = 0.200 x 80/1000

                            = 0.016

The mole of Fe in the reaction is more than the mole of CuSO4. Thus, CuSO4 is the limiting reactant of the reaction. Fe is in excess.

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What is the molarity of a 100 mL solution that contains 2.00 g KCL

Answers

Answer:

The molarity will be "0.26 M".

Explanation:

The given values are:

Mass,

= 2.00 g

Volume of solution,

= 100 mL

or,

= [tex]\frac{100}{1000}[/tex]

= [tex]0.1 \ L[/tex]

Molar mass of KCl,

= 74.5 gm

Now,

Moles of KCl will be:

=  [tex]\frac{Given \ mass}{Molar \ mass}[/tex]

=  [tex]\frac{2}{74.5}[/tex]

=  [tex]0.026[/tex]

hence,

The molarity will be:

=  [tex]\frac{Moles \ of \ solute}{Volume \ of \ solution}[/tex]

On substituting the values, we get

=  [tex]\frac{0.026}{0.1}[/tex]

=  [tex]0.26 \ M[/tex]

Balance the following chemical equation by providing the correct coefficients:
[ ]HBr + [ ]Ba(OH)2 -> [ ]BaBr2 + [ ]H20

Answers

Answer:

2HBr + Ba(OH)2 → BaBr2 + 2H2O

Explanation:

Hydrogen Bromide + Barium Hydroxide = Barium Bromide + Water

The balanced chemical equation with the correct coefficients is 2HBr + Ba(OH)₂ → BaBr₂ + 2H₂O.

First balancing the barium (Ba) atoms first. There is one barium atom on the left side and one on the right side, so no coefficients are needed for barium.

HBr + Ba(OH)₂ → BaBr₂ + H₂O

There is one hydrogen atom on the left side and two hydrogen atoms on the right side. To balance the hydrogen, place a coefficient of 2 in front of HBr:

2HBr + Ba(OH)₂ → BaBr₂ + H₂O

There are two bromine atoms on the left side and two bromine atoms on the right side, so they are already balanced.

2HBr + Ba(OH)₂ → BaBr₂ + H₂O

There is one barium atom on the left side and one barium atom on the right side, so they are already balanced.

Balance the oxygen (O) atoms. There are two oxygen atoms on the left side and only one on the right side. To balance the oxygen, place a coefficient of 2 in front of H₂O.

2HBr + Ba(OH)₂ → BaBr₂ + 2H₂O

To learn more about the coefficients, follow the link:

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what is the similar of snow and sleet pls help me

Answers

Answer:

Explanation: Snow forms in clouds at temperatures below freezing. As snow falls through the atmosphere, the air remains at least 32° F or colder. ... It then re-enters another pocket of cold air before reaching the surface. The snowflake refreezes and becomes an ice pellet we call sleet.

how could you use a thin glass tube to place the crystal at the bottom of the beaker of water​

Answers

Answer:

explation

Explanation:

you put ice cold water in a glass, and in another glass put boiling water, how long would it take for the two cups of water to be roughly the

Due to the surface tension of water and the crystals ability of diffusion the crystals are placed at the bottom of the beaker of water​.

What is diffusion?

Diffusion is defined as the process of movement of molecules which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.

There are 2 main types of diffusion:

1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.

2) facilitated diffusion- It is a passive movement of molecules across cell membrane from higher concentration region to lower concentration.

There are 2 types of facilitated diffusion one is osmosis and dialysis.

Learn more about diffusion,here:

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When two solutions are combined, what evidence would show a chemical
reaction has occurred? *
temperature remains constant
a precipitate forms
volume increases

Answers

a precipitate forms because when a chemical change occurs a new substance is formed.

3) Pick the correct definition for : A signal represented by a continuous wave *-1 analog signal-2 digitized siganal-3-encode-4-transmit-5-wave pulse.

plzzzz help brainliest and 50 points

Answers

Answer:

it is analog signal, your welcome

Analog Signal is the correct answer

Hope it helps you

Calculate the work for the expansion of CO2 from 1.0 to 6.5 litres against pressure of 1.0 atm at constant temperature

Answers

Answer:

557.3J is the work of expansion of the CO2 gas

Explanation:

The work of expansion of a gas under constant temperature and pressure (Isobaric pressure) is:

W = P*ΔV

Where W is work

P is pressure = 1.0atm

ΔV = Final volume - Initial Volume = 6.5L - 1.0L = 5.5L

Replacing:

W = 1.0atm*5.5L

W = 5.5atmL

In Joules (1atmL = 101.325J):

5.5atmL * (101.325J / 1atmL) =

557.3J is the work of expansion of the CO2 gas

In a chemical reaction, the mass of the reactants is 13.3 grams. Which of the
following could represent the mass of the products?

Answers

Answer:

26.6

Explanation:

I need answers to the lab report.

Answers

Answer:

Title.

Abstract.

Introduction.

Method.

Results and analysis.

Discussion.

Conclusion.

References.

Define a transverse wave

Answers

Transverse wave, motion in which all points on a wave oscillate along paths at right angles to the direction of the wave's advance. Surface ripples on water, seismic S (secondary) waves, and electromagnetic (e.g., radio and light) waves are examples of transverse waves.

what is the kinetic energy of a 5 kg bowling ball rolling at a velocity of 10 m/s?​

Answers

Answer:

K = 250 J.

Explanation:

Hello there!

In this case, by knowing that the kinetic energy is such energy associated to the movement of an object, it is possible for us to recall the formula for its calculation in terms of mass and velocity as shown below:

[tex]K=\frac{1}{2} mv^2[/tex]

Thus, given the mass and velocity, it is possible to obtain the following kinetic energy:

[tex]K=\frac{1}{2} (5kg)(10m/s)^2\\\\K=250J[/tex]

Regards!

Which event is an example of condensation?

Answers

"Fog forms in a valley", a physical process called condensation occurs when a gas or vapour transforms into a liquid state.

Which of the following example of condensation?

On a chilly soda can, water gathers. As the air cools around the container, water vapor in the atmosphere reaches its dew point and condenses into liquid droplets. Condensation is the conversion of water vapor into liquid. On the outside of a chilly glass or container, water vapor condenses and turns into liquid water (sweat).

What three condensation reactions are examples?

Aldol condensation, Knoevenagel condensation, Claisen condensation, and Dieckman condensation (intramolecular Claisen condensation) are a few examples of common condensations that produce alcohols as a by-product.

To know more about Condensation visit:-

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A certain element has only two naturally occurring isotopes: one with 18 neutrons and the other with 20 neutrons. The element forms I- charged ions when in ionic compounds. Predict the identity of the element. What number of electrons does the charged ion have?

Answers

Answer:

[Cl-18]⁻ & [Cl-20]⁻

Explanation:

By definition isotopes are elements with the same number of protons by different number of neutrons. Elements X-18 & X-20 have 17 protons and represent Chlorine isotopes Cl-18 & Cl-20 each with 17 protons and 18 electrons to give the isotopes a -1 oxidation state. Both isotope of chlorine have 7 electron in its valence shell and 10 electrons in its core structure.  Gaining 1 electron fills the valence octet and establishes a -1 oxidation state.

Drugs change the chemical processes in what organ to cause addiction?

Answers

Answer:

the brain

Explanation:

drugs mainly affect the brain to keep the addiction going

Answer:

In pituitary gland addiction causes to drugs

Mark me as brainliest

La clorurarea catalitică a toluenului, se obţine un amestec format din 2-clorotoluen, 4-clorotoluen şi benzennereacționat în raport molar de 3 : 2 : 1. Calculaţi cantitatea de 2-clorotoluen, exprimată în moli, care se obținedin 110,4 g de toluen, în în prezența catalizatorului FeCl3.

Answers

Answer:

i dont lnow you heat alcohol over an open flame

The isotopes K-37 and K-42 have the same...

1) number of neutrons

2) number of protons

3) mass number for their atoms

Answers

Answer:

WHEA O IN AN EREM STATO. PETUA TOT low 6 EN 6ACY STATE ... Determine both the total number of protons and the total number of neutrons in an atom of the naturally occurring carbon isotope with the largest mass number.

Explanation:

ok

A graph titled Average Amplitude of Waves from 2009 to 2011 with vertical axis Average Amplitude (meters) and horizontal axis Year. A line goes in straight segments from 2009 50 to 2010 175 to 2012 125.
A structural engineer is using this table to design a wall to protect a city near the ocean.

How high should the engineer build the wall?

50 meters
100 meters
150 meters
200 meters

Answers

Answer:

200

Explanation:

got it right on the test

Answer:

200

Explanation:

PLEASE HELP ASAP! AND PLEASE DO NOT GIVE ME ANY VIRUSES!


Carbon dioxide and oxygen are linked together in the carbon and oxygen cycle. There are two cellular processes involved in this cycle. What are they called, and what does each process make?


Mark two answers below.

Carbon dioxide is generated by cellular respiration and released into the atmosphere.

Cellular respiration makes oxygen that plants and animals can release into the atmosphere.

Carbon dioxide is a product of photosynthesis that plants release into the atmosphere.

Photosynthesis makes oxygen that plants can release into the atmosphere.

Answers

Answer:

The first one and the last one.

Explanation:

Carbon dioxide is generated by cellular respiration and released into the atmosphere.

Photosynthesis makes oxygen that plants can release into the atmosphere.

Determine the oxidation number of the element "X" in H2XO4.

Answers

The correct answer is 6

2. An atom of Be has four protons, five neutrons and four electrons. What 10 poin
is the mas of Be? *
O a.4
b. 5
c. 1
09

Answers

Answer:

Five ( 5 ) is the correct answer

Why are some waves small and some large?

Answers

(◕‿◕✿) Hey There!

Answer → The Waves Size depends on ★ wind speed ★ , ★ wind duration★ , and the ★ area over which the wind is blowing ★

✨Hope This Helps!✨

Which reaction type is really part of another type of reaction but treated separately? Explain

Answers

Answer:

Oxidation - reduction reaction which is called redox reaction.

Explanation:

The type of reaction that is a part of another type but treated separately is called Oxidation - reduction reaction.

Thus is because they usually involve 2 separate half reactions which are oxidation reactions that involve loss of electrons and then reduction equations which involve gain of electrons.

They are treated separately for example when sodium reacts with chlorine to form sodium chloride.

2Na + Cl2 = 2NaCl

Now, sodium undergoes oxidation by loosing elctrons and it's half reaction is;

2Na → 2Na​^(+) + 2e^(-)

​​Meanwhile chlorine undergoes reduction by gaining electrons and its half reaction is;

Cl2 + 2e^(-) → 2Cl^(-)

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