Answer:
mg2+ because it is a very good idea
Determine the enthalpy for the reaction A+B --> C If we know the following:
A+E --> C+D; delta H = -200 kJ
D+B --> E; delta H = -100 kJ
Explanation:
here is the answer to the question
Stoichiometry - Chemistry
Answer:
C
Explanation:
in the option C when we rearrange it then it will he C3H6O2
Answer:
yes its C
Explanation:
correct me if iam wrong
A heat lamp produces____
light.
Answer:
infrared light
Explanation:
WHAT IS KNOWN AS HYBRIDIZATION
[tex] \red{ \bold {\huge{ \textit{ \boxed {{\blue{QUESTION}}}}}}}[/tex]
WHAT IS KNOWN AS HYBRIDIZATION
[tex]\huge\boxed{\fcolorbox{red}{blue}{ ANSWER }}[/tex]
[tex] \orange{\underline{\huge{\bold{\textit{\green{\bf{HYBRIDIZATION}}}}}}} [/tex]
It is the change in the orbitals of the central atom of the molecule to form bonds with other atom if same type or another type.The hybrid orbitals r of same level .
The Hybridization takes place in between orbitals of equal or very less energy levels to form same level of energy in all orbitals.
The orbitals combine is always equal to The number of orbitals formed
The names of hybridized orbitals r kept according to the orbital which r combined to form them
Eg:-sp orbital :- one s and one p combine to form sp orbital
[tex]s {p}^{2} [/tex]orbital :- one s and two p orbitals combine to form it..
[tex]\:\:\:\:\:\:\:\:\star DEVIL005\star[/tex]
I’ll mark you as brainlister
A student determines the calcium content of a solution by first precipitating it as calcium hydroxide, and then decomposing the hydroxide to calcium oxide by heating. How many grams of calcium oxide should the student obtain if his solution contains 55.0 mL of 0.458 M calcium nitrate?
Answer:
1.41g
Explanation:
all work is shown in the attached image :-)
What phrase describes a good scientific question?
has a wide focus
addresses a gap in knowledge
does not lead to a testable hypothesis
O has a simple yes or no answer
vious Activity
What is the molarity of the solution formed by dissolving 80. G of NAOH(s) into water to give a total volume of 4.00 l
Answer:
0.5 M
Explanation:
From the question given above, the following data were obtained:
Mass of NaOH = 80 g
Volume of solution = 4 L
Molarity =?
Next, we shall determine the number of mole in 80 g of NaOH. This can be obtained as follow:
Mass of NaOH = 80 g
Molar mass of NaOH = 23 + 16 + 1
= 40 g/mol
Mole of NaOH =?
Mole = mass / molar mass
Mole of NaOH = 80 / 40
Mole of NaOH = 2 moles
Finally, we shall determine the molarity of the solution. This can be obtained as follow:
Mole of NaOH = 2 moles
Volume of solution = 4 L
Molarity =?
Molarity = mole / Volume
Molarity = 2/4
Molarity = 0.5 M
Therefore, the molarity of the solution is 0.5 M.
The mass of a neutron is
Directions: Write True if the statement is correct, if it is not, make the false statement true by changing the underlined word or phrase 1. A constellation is a configuration of stars that form a pattern. 2. The Little Dipper is a part of the constellation Ursa Major 3. The North Star is found in the Little Dipper 4. The North Star is also called Merak. 5. The North Polar Constellations can be seen in the Northern Hemisphere. ales atterns in the night sky constellations
BRAINLIEST+FOLLOW+HEART+RATE
BAD ANSWER-REPORT
MAAYOS NA SAGOT KAILANGAN LANG PO
Answer:
1. A constellation is a configuration of stars that form a pattern. True
2. The Little Dipper is a part of the constellation Ursa Major. False
3. The North Star is found in the Little Dipper.True
4. The North Star is also called Merak. False
5. The North Polar Constellations can be seen in the Northern Hemisphere. ales atterns in the night sky constellations .True
Polywool fibre is
a.natural
b.synthetic
c.monomer
d.blended
Polywool fibre is synthetic.
⇒b. Synthetic
Hope It Helps You ✌️
Answer:
[tex]\large{\underbrace{\underline{\fcolorbox{White}{pink}{\bf{b.synthetic }}}}}
[/tex]
Energy transformation of a kettle?
Explanation:
Electrical energy into heat energy..hope it helps.stay safe healthy and happy...Diego is trying to lift a piano to the second floor of his house. Diego uses a pulley system and gives a big lift to the piano.The piano moves upward, then stops, and then it starts to fall to the ground. (The direction of the force of gravity is negative.) Which list best describes the forces on the piano in the proper order
Answer:
positive force → balanced force → negative force
Explanation:
np
Answer:
positive force → balanced force → negative force
Explanation:
:)))
If a man reach a 25 km distance in 30 min in his car , find the average velocity
Answer:
Average velocity of car = 50 km/h
Explanation:
Given information;
Distance cover by man in his car = 25 kilometer
Time taken by man to cover distance = 30 min
Find:
Average velocity of car
Computation:
Time taken by man to cover distance = 30 min
Time taken by man to cover distance = 30 / 60
Time taken by man to cover distance = 0.5 hour
Average velocity = Distance / Time
Average velocity of car = Distance cover by man in his car / Time taken by man to cover distance
Average velocity of car = 25 / 0.5
Average velocity of car = 50 km/h
What volume is occupied by 0.109 molmol of helium gas at a pressure of 0.98 atmatm and a temperature of 307 K
Answer:
2.8 L
Explanation:
From the question given above, the following data were obtained:
Number of mole (n) = 0.109 mole
Pressure (P) = 0.98 atm
Temperature (T) = 307 K
Gas constant (R) = 0.0821 atm.L/Kmol
Volume (V) =?
The volume of the helium gas can be obtained by using the ideal gas equation as follow:
PV = nRT
0.98 × V = 0.109 × 0.0821 × 307
0.98 × V = 2.7473123
Divide both side by 0.98
V = 2.7473123 / 0.98
V = 2.8 L
Thus, the volume of the helium gas is 2.8 L.
A sample of substance "B" has a mass of 37.6g contained in a volume of
9.65mL. What is the density of substance "B"? (Report your answer with 3
s.f. E.G.: 6.00g/mL)
Answer:
3.90g/mL
Explanation:
To find the density of a substance, divide the mass by the volume.
So, 37.6 / 9.65 = 3.89637
then round to 3 significant figures
Good luck!
Because electrons are orbiting the nucleus, the nucleus is stationary
true or false
Answer:
false, The nucleus of atoms still move around like crazy, it's just the electrons move more.
một oxit của photpho có thành phần trăm của P bằng 43,66% . Biết phân tử khối của Axit bằng 142đvC. Công thức hóa học của Axit là ?
Answer:
câu trả lời trong hình ảnh
Which of the following contains the greatest mass of oxygen?
A
1 mole of oxygen gas, 02
B
1.8 mole of oxygen atoms
C
30 g of oxygen gas
D
3.01 x 1024 atoms of oxygen
Answer:
letter d
Explanation:
hope it's help you
Kelvin And Mimi studied the fruits. Kelvin concluded that there are more ovules in a mango flower than a papaya flower while Mimi
argued that there are more ovules in a papaya flower than a mango flower.
(a) who is correct?
(b)Explain your answer in (a).
Answer:
kevin is right according to what i see
The first excited state of a particular atom in a gas is 6.1 eV above the ground state. A moving electron collides with one of these atoms, and excites the atom to its first excited state. Immediately after the collision the kinetic energy of the electron is 3.2 eV. What was the kinetic energy of the electron just before the collision
Answer:
The kinetic energy of the electron just before the collision is 9.3 eV.
Explanation:
We can find the kinetic energy of the electron before the collision can be found by energy conservation:
[tex] E_{i} = E_{f} [/tex]
[tex] K_{a_{i}} + K_{e_{i}} = K_{a_{f}} + K_{e_{f}} [/tex] (1)
Where:
[tex]K_{a_{i}}[/tex]: is the initial kinetic energy of the atom
[tex]K_{a_{f}}[/tex]: is the final kinetic energy of the atom = 6.1 eV + [tex]K_{a_{i}}[/tex]
[tex]K_{e_{i}}[/tex]: is the initial kinetic energy of the electron =?
[tex]K_{e_{f}}[/tex]: is the final kinetic energy of the electron = 3.2 eV
By solving equation (1) for [tex]K_{e_{i}}[/tex] we have:
[tex]K_{a_{i}} + K_{e_{i}} = (6.1 eV + K_{a_{i}}) + 3.2 eV[/tex]
[tex] K_{e_{i}} = 6.1 eV + 3.2 eV = 9.3 eV [/tex]
Therefore, the kinetic energy of the electron just before the collision is 9.3 eV.
I hope it helps you!
At a recycling plant, old tin cans are melted down and reconstructed. This is an example of a ___________.
hat is the molarity of a solution prepared by dissolving 12.0 g of ethylene glycol, C2H6O4, in water to make 250.0 mL of solution
Answer:
0.512 M
Explanation:
We'll begin by calculating the number of mole in 12 g of C₂H₆O₄. This can be obtained as shown below:
Mass of C₂H₆O₄ = 12 g
Molar mass of C₂H₆O₄ = (2×12) + (6×1) + (4×16)
= 24 + 6 + 64
= 94 g/mol
Mole of C₂H₆O₄ =?
Mole = mass /molar mass
Mole of C₂H₆O₄ = 12 / 94
Mole of C₂H₆O₄ = 0.128 mole
Next, we shall convert 250 mL to L. This can be obtained as follow:
1000 mL = 1 L
Therefore,
250 mL = 250 mL × 1 L / 1000 mL
250 mL = 0.25 L
Thus, 250 mL is equivalent to 0.25 L.
Finally, we shall determine the molarity of the solution. This can be obtained as follow:
Mole of C₂H₆O₄ = 0.128 mole
Volume = 0.25 L
Molarity =?
Molarity = mole /Volume
Molarity = 0.128 / 0.25
Molarity = 0.512 M
Thus, the molarity of the solution is 0.512 M
You react 25.0 grams of aluminum with iron (II) chloride. How many grams of iron will you
make? 2A1 + 3FeCl2 --> 2AlCl3 + 3Fe
(PLS HELP ASAP)
Explanation:
hope the picture above helps you to understand:)
please let me know if this is correct?
Answer: Yes! you're all good. Alkali metals in group 1 are the most metallic :)
Options ^
QUESTION:
Which of the following choices will an atom of sodium (Na) be most likely to bond with?
Answer:
A. 2 chlorine (Cl) atoms
Explanation:
2 chlorine atoms means that chlorine is a gas.
Sodium (Na) reacts with 2 chlorine atoms according to the equation below;
Na(s) + Cl2(g) => NaCl2
Answer:
fluorine is what its looking for
Explanation:
need help asap!!!
so i don’t necessarily need an answer just how to solve everything.
this is the first one:
calcium hydroxide + ammonium chloride
the instructions are attached to this question. i’m just not sure how to do everything. it doesn’t give me the products side only the reactants so how am i supposed to write and balance the equation?
Explanation:
とおふぉくぉをえおろとようおいおぽあおそ・
'」*とまっぉのもヴぉこぉぞぽ、こ、
Answer:
Ca(OH)2 + 2NH4Cl .................. CaCl2 + 2NH3 + 2H2O
what is displacement?
Answer:
the moving of something form it's places or position
How many grams of Br are in 345g of CaBr2?
Answer:
276g of Br are present
Explanation:
To solve this question we need to find the moles of CaBr2 using its molar mass -CaBr2: 199.89g/mol-. As 1 mole of CaBr2 contains 2 moles of Br we can find the moles of Br and its mass:
Moles CaBr2:
345g * (1mol/199.89g) = 1.7259 moles CaBr2
Moles Br:
1.7259 moles CaBr2 * (2mol Br / 1mol CaBr2) = 3.4519 moles Br
Mass Br -Molar mass: 79.904g/mol-
3.4519 moles Br * (79.904g/mol) = 276g of Br are present
A mixture of gases contains 0.320 mol CH4, 0.240 mol C2H6, and 0.300 mol C3H8. The total pressure is 1.45 atm. Calculate the partial pressures of the gases.
Answer:
pCH₄ = 0.540 atm
pC₂H₆ = 0.405 atm
pC₃H₈ = 0.505 atm
Explanation:
Step 1: Calculate the total number of gaseous moles
n = n(CH₄) + n(C₂H₆) + n(C₃H₈)
n = 0.320 mol + 0.240 mol + 0.300 mol = 0.860 mol
Step 2: Calculate the partial pressure of each gas
We will use the following expression.
pi = P × Χi
where,
pi: partial pressure of the gas "i"P: total pressureΧi: mole fraction of the gas "i"pCH₄ = 1.45 atm × 0.320 mol/0.860 mol = 0.540 atm
pC₂H₆ = 1.45 atm × 0.240 mol/0.860 mol = 0.405 atm
pC₃H₈ = 1.45 atm × 0.300 mol/0.860 mol = 0.505 atm