Answer:
Conduction
Explanation:
What is the molarity of a sodium carbonate solution containing 32.52 g Na2CO3 dissolved in enough water to make 822 ml of solution?
NEED ASAP PLEASE!!
The molarity of a Sodium carbonate solution : 0.373 M
Further explanationGiven
32.52 g Na₂CO₃
822 ml of solution = 0.822 L
Required
The molarity
Solution
Molarity shows the number of moles of solute in every 1 liter of solution.
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
mol of solute = mol of Na₂CO₃ :
= mass : MW Na₂CO₃
= 32.52 g : 106 g/mol
= 0.307
Molarity :
= n : V
= 0.307 mol : 0.822 L
= 0.373 M
9) A certain atom has 10 electrons, 14 neutrons, and 11 protons. Write the name of this element in isotope notation.
Answer:
²⁵₁₁Na⁺
Explanation:
Details about the atom:
Number of electrons = 10 electrons
Number of neutrons = 14 neutrons
Number of protons = 11 protons
The atomic number of an atom is a good indicator of the type of atom we have been given.
From the subatomic particles, the number of protons is the same as the atomic number.
Since the number of protons is 11, its atomic number will be 11.
The element with atomic number 11 is sodium, Na.
To write a complete notation, we also need the mass number;
Mass number = number of protons + number of neutrons
Mass number = 11 + 14 = 25
The charge on the atom:
Charge = Number of protons - number of electrons = 11 - 10 = 1+
The element in isotopic notation is given as;
²⁵₁₁Na⁺
Which of the following types of radiation from the Sun has the longest wavelength?
A) gamma
B) infrared
C) ultraviolet
D) visible
Answer:
B) infrared im pretty sure
Answer:
Infrared
Explanation:
2)
Compare the atomic radius of an atom of bromine to the atomic radius of an atom
potassium when both atoms are in the ground state.
What volume of hydrogen gas, when combined with nitrogen gas,
is necessary to produce 16.0 L of ammonia gas (NH3)?
The volume of Hydrogen gas : 24 L
Further explanationGiven
16 L Ammonia(NH₃)
Required
The volume of Hydrogen gas
Solution
Reaction
N₂ + 3H₂ ⇒ 2NH₃
Avogadro's hypothesis:
In the same T,P and V, the gas contains the same number of molecules
So the ratio of gas volume will be equal to the ratio of gas moles
V₁/n₁=V₂/n₂
From the equation, mol ratio of H₂ : NH₃ = 3 : 2, so volume of H₂ :
= 3/2 x volume of NH₃
= 3/2 x 16 L
= 24 L
which group served as the control in this investigation
Answer:
What is the investigation?
Explanation:
We have seasons because
Answer:
Earth's axis is tilted at an angle of about 23.4 degrees and different parts of Earth receive more solar energy than others. Earth's orbit around the Sun is elliptical. Because of Earth's axial tilt (obliquity), our planet orbits the Sun on a slant which means different areas of Earth point toward or away from the Sun at different times of the year.
Explanation:
The sun provides heat
against at -20 degree centigrade occupied the volume of one 40 ml calculate the temperature at which the volume of cash pickup 65ml pressure remain constant
The final temperature :T₂=411.125 K = 138.125 °C
Further explanationGiven
T₁=-20 °C+273 = 253 K
V₁=40 ml
V₂=65 ml
Required
Final temperature
Solution
Charles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Input the value :
T₂=(V₂.T₁)/V₁
T₂=(65.253)/40
T₂=411.125 K = 138.125 °C
help me with science for brainiest:)
Answer:
The answer is C. Plasma
Which one of the following substances will have hydrogen bonding as one of its intermolecular forces?
a
о
Нc— c— СТ.
Oь
o=
H— С—Н
нан
H— C— N
н н
н
0
1
— С—С
1
н н
Answer:
Explanation:
hc-- c--ct
The correct answer is option A: CH3COCH3
Hydrogen bonding occurs when hydrogen is directly bonded to a highly electronegative atom.
Hydrogen bonding is one of the intermolecular interactions. It occurs only when hydrogen is bonded to a very electronegative atom in a molecule. Hydrogen bonding can occur between two molecules of the same type(intermolecular hydrogen bonding) or within the same molecule (intra molecular hydrogen bonding). In either case, the bonding is polar as hydrogen is attached to the electronegative atom via a non-covalent bonding interaction.
Looking at the structures in the question attached, CH3COCH3 does not have any hydrogen atom directly attached to a highly electronegative atom hence CH3COCH3 does not exhibit hydrogen bonding.
Hydrogen bonding in water is shown in the image attached.
For more about hydrogen bonds, see
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Sample A is measured to have a mass of 7.3g and sample B has a mass of 8.28g. Which measurement best describes their combined mass?
A.16g
B.15.58g
c.15.5g
D15.6g
What gases do scientists think may have been in the early atmosphere? *
How do chemists use systems and order in their work?
Answer:
5 point) Chemists used systems and order because they study the basic unit of all forms of matter, which is the atom . However, there are several different kinds of atoms, called elements . Chemists organize these elements using the periodic table .
Explanation:
what are the orbitals present in the fifth principal energy level
Answer:
what are the orbitals present in the fifth principal energy level
Explanation:
Answer: the fifth principal energy level has the s, p, d, and f orbitals so the answer is letter d
Explanation:
can electricity and light bring about reversible and irreversible changes ? Give examples
Answer:
yes
Explanation:
Yes, electricity and light can bring reversible and irreversible changes. Light : Reversible change - The light illuminate it's surrounding's environment which is reversible when we turn off the source of the light. ... And,this reaction is an irreversible change
MgCl2+ Na2O---> NaCl+ Mgo
Balance the equation
Answer:
MgCl2 + Na2O ---> 2NaCl + MgO
light travels faster than sons. true or false?
Answer:
true
Explanation:
light travels faster than sound.
if you have 3g of sodium and 4g of chlorine what is the total mass of sodium chloride
Answer:
7g
Explanation:
Given parameters:
Mass of sodium = 3g
Mass of chlorine = 4g
Unknown:
Total mass of sodium chloride = ?
Solution:
This problem entails the direct application of the law of conservation of mass. According to this law, it states that "matter is neither created nor destroyed in the course of a chemical reaction".
So, when sodium and chlorine combines to form sodium chloride, to are expect to produce substance with a mass which adds up to the sum of the reactants;
Mass of sodium chloride = mass of sodium + mass of chlorine
= 3g + 4g
= 7g
How does the bond formed determine the physical and chemical characteristics of the compounds and molecules formed?
I'm pretty sure we have the same class (I go to FL), because I have the same problem, and it was assigned the day you posted this, so I can't give a full answer but important things would be conducting electricity, solubility, flexibility, shape, and geometries. Sorry I can't be of more help!
A plane flies from NY to LA at a constant speed of 800 km/hr. How long will it take the plane to fly the 4200 km? 5
As the plane plane flies at a constant speed of 800 km/hr the plane will take 5 hours 25 minutes to fly distance of 4200 km.
What is speed?Speed is defined as the rate of change of distance with time. It has the dimension of distance by time. Thus, the SI unit of speed is given as the combination of the basic unit of distance and the basic unit of Time. Thus, the SI unit of speed is metre per second. In everyday life, kilometre per hour or in countries like US and UK miles per hour are used as the unit of speed.
The SI unit of speed can be derived from the formula of velocity. Basically, velocity is the vector equivalent of speed. Mathematically, velocity is given as the ratio of displacement to the time taken.So, 800 km is traveled in 1 hour so 4200 km will be traveled 4200/800=5.25 which is 5 hours and 25 minutes.
Thus, the plane will take 5 hours 25 minutes to fly distance of 4200 km.
Learn more about speed,here:
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Describe the function of the PNS and
the CNS.
Answer: PNS, CNS is
Periferal nervous system. Central nervous system.
Explanation:
Need help!!!
Will give brainliest for answer
Give oxidation and reduction half-reactions to the equation provided
Explanation:
here u go kid , welcome kid :)
can yall help w this? iss times so try nd hurry :P
Answer:
The first option
Explanation:
No new compounds were added, and the pre existing ones wern't changed, so option one is the only one that makes sense.
Good luck!
Guys please I need an answer for this asap
Mg+2HCl -> MgCl+H2
0.2 mole of mg reacted with 0.2 of HCl
What is the mass of hydrogen gas produced?
After a lightning storm, the Rodriguez family notices the TV no longer works.
What probably caused this malfunction?
A. Power from the TV was pulled into the ground by the lightning.
B. A power surge burned an electric component of the TV.
C. The lightning sucked power from the TV.
D. The surge protector sucked power from the TV.
Answer:
B
Explanation:
A P E X
After a lightning storm, the Rodriguez family notices the TV is no longer working because a power surge burned an electric component of the TV. The correct option is B.
What is lightning?Lightning is a natural phenomenon that occurs when there is a collision of negative and positive charged particles. It appears as light or spark of electricity into the earth. It shines and affects the eyes if directly seen.
Lightning occurs when there is thunder or rain, lightning causes destruction to the earth, the houses, trees, and people are also impacted by this. The TV was not working because there was a short circuit due to lightning.
Thus, the correct option is B. A power surge burned an electric component of the TV during a lightning storm.
Learn more about lightning, here:
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How many electrons can be present in an atom having three principal
energy levels? *
Answer:
18 electrons
Explanation:
The third principal energy level has one s orbital, three p orbitals, and five d orbitals, which can each hold up to 10 electrons. This allows for a maximum of 18 electrons. The fourth and higher levels have an f sublevel in addition to the s, p, and d orbitals.
Answer:
18 electrons
Explanation:
The five d orbitals can hold up to 10 electrons. Thus, the third level holds a maximum of 18 electrons: 2 in the s orbital, 6 in the three p orbitals, and 10 in the five d orbitals.
An example of a chemical change is
Mashing potatoes
Dew disappearing from the grass
Frying a hamburger
A magnet sticking to the refrigerator
Answer:
Frying a hamburger
Explanation:
when frying a hamburger you change the properties of the meat by applying heat and in the other answer choices the element is not changed.
How many atoms are in 1.5 moles of iron?
Answer:
One mole of anything is 6.022×1023 everythings, including atoms. Multiply the moles Fe by 6.022×1023 atoms/mol. 3.77mol Fe ×6.022×1023atoms Fe1mol Fe =2.27×1024 atoms Fe rounded to three significant figures.
The number of atoms present is 1.5 moles of iron is 9.0 ×10²³ atoms
From the question,
We are to determine the number of atoms present in 1.5 moles of iron.
From the formula,
[tex]Number\ of\ moles = \frac{Number\ of\ atoms}{Avogadro's\ constant}[/tex]
Then, we can write that
Number of atoms = Number of moles × Avogadro's constant
∴ Number of atoms of iron present = 1.5 × 6.022×10²³
Number of atoms of iron present = 9.033 ×10²³ atoms
Number of atoms of iron present ≅ 9.0 ×10²³ atoms
Hence, the number of atoms present is 1.5 moles of iron is 9.0 ×10²³ atoms
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plzzz helppp!!!
How long would it take you to travel 8 miles at a speed of 1 mile per hour?
Answer:
It would take you 8 hours.
Explanation:
This would take you 8 hours because you are going 1 mile an hour. So in 1 hour, you would have gone 1 mile.