Answer:
boiling water on a stove is an example of thermal energy thermal energy produced when the atoms and molecules is in a substance vibrate faster due rise in temperature .
PLEASE mark brainlest ......... please
What test would be done to prove the color of specific compounds is due to metal ions apart from flame test
Answer:
Borax bead test
Explanation:
Another test that can be used to identify colored ions in a specific compound such as salt is called "Borax bead test".
This test involves use of a clear glassy bead of borax that is joined together in a wire loop which is going to be involved in chemical reaction with the salts of certain metals.
This reaction will produce colors that we can use to identify the exact metal ions that are present.
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?
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.
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
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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In a chemical reaction, the mass of the reactants is 13.3 grams. Which of the
following could represent the mass of the products?
Answer:
26.6
Explanation:
How many atoms does methane=CH4?
Answer:
It has 1 carbon atom and 4 hydrogen atoms
Explanation:
hope this helps :)
When two solutions are combined, what evidence would show a chemical
reaction has occurred? *
temperature remains constant
a precipitate forms
volume increases
Which reaction type is really part of another type of reaction but treated separately? Explain
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^(-)
Balance the following chemical equation by providing the correct coefficients:
[ ]HBr + [ ]Ba(OH)2 -> [ ]BaBr2 + [ ]H20
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
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What is the molarity of a 100 mL solution that contains 2.00 g KCL
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]
what is the kinetic energy of a 5 kg bowling ball rolling at a velocity of 10 m/s?
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!
The equation below shows the decomposition of lead nitrate. How many grams of lead (II) oxide are also produced when 20.5 g NO2 is formed?
Answer:
ligma
Explanation:
The isotopes K-37 and K-42 have the same...
1) number of neutrons
2) number of protons
3) mass number for their atoms
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
what is the similar of snow and sleet pls help me
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.
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
they involve tie sharing of 2 electrons pairs.
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
Answer:
200
Explanation:
got it right on the test
Answer:
200
Explanation:
Calculate the work for the expansion of CO2 from 1.0 to 6.5 litres against pressure of 1.0 atm at constant temperature
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
why can molar mass be used as a conversion factor
From the relative atomic mass of each element, it is possible to determine each element's molar mass by multiplying the molar mass constant (1 g/mol) by the atomic weight of that particular element. The molar mass value can be used as a conversion factor to facilitate mass-to-mole and mole-to-mass conversions.
Answer:
A substances molar mass is determined by increasing its relative nuclear mass by the molar mass constanttt (1 g/mol). So the molar mass consistent can be utilized to change mass over to moles. So by duplicating a given mass by the molar mass, the measure of moles of the substance can be determined.
Explanation:
From the general nuclear mass of every component, it is feasible to decide every component's molar mass by duplicating the molar mass steady (1 g/mol) by the nuclear load of that specific element.The molar mass worth can be utilized as a change factor to work with mass-to-mole and mole-to-mass transformations.
Brainliest?
A
B
prevents different air masses from mixing.
a. Direction
b. Location
c. Density
d. Size
Answer:
c Density
Explanation:
I don'tknow if I am right if I am wrong correct me
Define a transverse wave
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.
Answer:
i dont lnow you heat alcohol over an open flame
please help me ;-; I need help grades are in tomorrow
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
put some ice in a clean glass. examine it every 3 minutes for half oan hour . DIscribe what happens to the ice
Answer:
the ice starts melting and turns into water
I need answers to the lab report.
Answer:
Title.
Abstract.
Introduction.
Method.
Results and analysis.
Discussion.
Conclusion.
References.
I need help on this 6th grader science plants.
Answer:
A - A fruit of vegetable will begin to grow
3. How are natural selection and selective breeding related?
can someone help?
Answer:
In natural selection, organisms adapt to the environment to best suit nature's needs to survive. In selective breeding, it's as if nature were humans and the humans can choose which organisms can survive and die. They do it so they can develop organisms with desirable characteristics.
5.
Which sentence best describes the relationship between genes and chromosomes?
A.
Genes are found within chromosomes.
B.
Several chromosomes make up one gene.
C.
Genes and chromosomes are the only things that form the nucleus.
D.
Several genes are attached to different parts of the Golgi apparatus.
Answer:
a
Explanation:
Drugs change the chemical processes in what organ to cause addiction?
Answer:
the brain
Explanation:
drugs mainly affect the brain to keep the addiction going
Answer:
In pituitary gland addiction causes to drugs
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Which event is an example of condensation?
"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.
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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
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]
0.47 M KNO3 solution contains .757475 mol of KNO3 what is the volume
Answer:
Volume is the quantity of three-dimensional
Explanation: