Answer:
Mass = 154.95 g
Explanation:
Given data:
Mass of sodium react = 115 g
Mass of sodium oxide formed = ?
Solution:
Chemical equation:
4Na + O₂ → 2Na₂O
Number of moles of sodium:
Number of moles = mass/molar mass
Number of moles = 115 g/ 23 g/mol
Number of moles = 5 mol
Now we will compare the moles of sodium and sodium oxide.
Na : Na₂O
4 : 2
5 : 2/4×5 = 2.5 mol
Mass of sodium oxide:
Mass = number of moles × molar mass
Mass = 2.5 mol × 61.98 g/mol
Mass = 154.95 g
What’s the balance?
Fe + O2 > Fe2 O3
Explain pls
Answer:
Fe = 4 O=6
O = 6 Fe = 4
Explanation:
Fe + O2 > Fe2 O3
4Fe + 3O2 > 2Fe2 O3
Check
Fe = 4 Fe = 4
O = 6 O = 6
This is the balance equation.
what layer is the asthenosphere?
(in number order) ex: layer *number*
Answer:
Mantle
Explanation:
Asthenosphere, zone of Earth's mantle lying beneath the lithosphere and believed to be much hotter and more fluid than the lithosphere. The asthenosphere extends from about 100 km (60 miles) to about 700 km (450 miles) below Earth's surface.
According to the law of conservation of mass, three atoms of calcium can react to produce ____ atoms of calcium.
a. three
b. five
c. two
d. four
How many liters of NH3 can be produced from the reaction of 6.57L of N2 with an excess of H2?
N2 + H2–-> NH3
Answer:
13.14L
Explanation:
The reaction expression is given as:
N₂ + 3H₂ → 2NH₃
The given reaction is not balanced and we have balanced it as shown above in the reaction.
N₂ + 3H₂ → 2NH₃
Based on the Avogadro's law, equal volume of all gases contains the same number of molecules at the same temperature and pressure.
1 L of N₂ will produce 2L of NH₃
So 6.57L of N₂ will produce 2 x 6.57 = 13.14L of NH₃
Please help fast, I will give brainliest!
Which substance is a reactant(s)
O2 only
MgO only
Mg and O2
Mg only
Determine the empirical and molecular formula for chrysotile asbestos. Chrysotile has the following percent composition: 28.03% Mg, 21.60% Si, 1.16% H, and 49.21% O. The molar mass for chrysotile is 520.8 g/mol
The empirical and molecular formula : Mg₃Si₂H₂O₈ and Mg₆Si₄H₄O₁₆
Further explanationGiven
28.03% Mg, 21.60% Si, 1.16% H, and 49.21% O
Required
The empirical and molecular formula
Solution
Mol ratio : Mg : Si : H : O =
[tex]\tt \dfrac{28.03}{24}\div \dfrac{21.6}{28}\div \dfrac{1.16}{1}\div \dfrac{49.12}{16}\\\\1.17\div 0.771\div 1.16\div 3.07\\\\1.5\div 1\div 1.5\div 4\\\\3\div 2\div 2\div 8[/tex]
So empirical formula :
[tex]\tt Mg_3Si_2H_2O_8[/tex]
(Emprical formula)n=molecular formula
(Mg₃Si₂H₂O₈)n=520.8
(24.3+28.2+2.1+8.16)n=520.8
(258)n=520.8⇒n=2
The molecular formula : Mg₆Si₄H₄O₁₆
Based on what you have learned about the water cycle, explain 3 ways that life on earth would be impacted if there was no transpiration.
1. The water inside a plant will not be able to come out.
2. It would kill the plants and species on Earth.
3. There would be no lakes, ocean, or water on land.
How long is the moon's orbit around the Earth?
a sample of silver contains 5.71x10^22 atoms. how many moles of silver are present
N=n×Nav
n=N / Nav
(5.71×10^22) / (6.02×10^23)
n=0.09mol
According to the concept of Avogadro's number, there are 0.0948 moles of silver present in 5.71×10²² atoms of silver.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
Therefore, number of moles=number of atoms/Avogadro's number
number of moles=5.71×10²²/6.023×10²³=0.0948
Thus, there are 0.0948 moles in 5.71×10²² atoms of silver.
Learn more about Avogadro's number,here:
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how are cells produced through mitosis and meiosis different?
A.They have different cell shapes.
B.They have different numbers of chromosomes
C.They have different levels of activity in the ribosomes
D. They have different components in the cell membrane
Answer:
Explanation:
I think b
Which of the following can effect the resistance of a wire?
I. the length of a wire
II. the thickness of a wire
III. the temperature of a wire
I and II
I and III
II and III
I, II, and III
Answer:
l and lll
Explanation:
The longer the wire, the more resistance that there will be and heating a metal conductor makes it more difficult for electricity to flow through it.
5. (10 Points) Chlorine gas is in a container that has a volume of 25.0 mL at
40°C. What volume will it occupy at 80°C?
PLS HELP
Answer:120.0mL
Explanation:
Which horizon would have the highest amount of organic material?
A horizon
B horizon
C horizon
O horizon
What is the balanced chemical equation for the reaction of aqueous sodium hydroxide and sulfuric acid?
Select one:
a.NaOH(aq) + H2SO4(aq) = H2O(l) + NaSO4(aq)
b.NaOH(aq) + H2SO4(aq) = H2O(l) + Na(SO4)2(aq)
c.2 NaOH(aq) + H2SO4(aq) = 2 H2O(l) + Na2SO4(aq)
d.NaOH(aq) + H2SO4(aq) = H2O(l) + Na2SO4(aq)
Answer:
c. 2 NaOH(aq) + H2SO4(aq) = 2 H2O(l) + Na2SO4(aq)
Explanation:
The reaction of a strong acid as H2SO4 and a strong base as NaOH produce water, H2O, and the salt, Na2SO4:
H2SO4(aq) + NaOH(aq) → H2O(l) + Na2SO4(aq) -Unbalanced reaction-
To balance the sodium atoms:
H2SO4(aq) + 2 NaOH(aq) → H2O(l) + Na2SO4(aq)
And, to balance hydrogen:
H2SO4(aq) + 2 NaOH(aq) → 2H2O(l) + Na2SO4(aq)
Thus, right option is:
c. 2 NaOH(aq) + H2SO4(aq) = 2 H2O(l) + Na2SO4(aq)In the chemical reaction 2CO(g) + O2 —-> 2CO2 if you react 55.0g of oxygen gas you would expect to produce what volume of carbon dioxide at stp
Answer:
13mL of CO₂ are produced
Explanation:
Based on the chemical reaction:
2CO(g) + O₂(g) → 2CO₂(g)
Where 1 mole of O₂ in excess of CO produce 2 moles of CO₂}
Thus, to solve this problem we need to convert the mass of oxygen gas to moles and, using the chemical reaction we can find the moles of CO₂ and its volume at STP:
Moles O₂ -Molar mass: 32g/mol-
55g O₂ * (1mol / 32g) = 1.72 moles O₂
Moles CO₂:
1.72 moles O₂ * (2 moles CO₂ / 1mol O₂) = 3.44 moles CO₂
Volume:
PV = nRT
V = P / nRT
Where P is pressure = 1atm at STP
n are moles = 3.44 moles of CO₂
R is gas constant = 0.082atmL/molK
T is absolute temperature = 273.15K at STP
V = 1atm / 3.44mol*0.082atmL/molK*273.15K
V = 0.0130L = 13mL of CO₂ are produced
Which organisms use cellular respiration as a way to convert energy into usable form?
Answer:they use cellular respiration to transform the glucose molecules they make into energy they can use for carrying out life's processes
Explanation:
Changing the number of protons in an atom would change which of the following ? Choose all that apply A. Atomic mass B. The identity of the element C. The charge of the atom D. None of the above
Answer:
A and B
Explanation:
The number of protons is used to identify an element in the periodic table. Hence, if the number of protons is changed, the identity of the element is changed also.
The atom of an element is composed of electrons, protons and neutrons. The number of protons in an atom is also called its atomic number.
The atomic number is used to identify an element. This implies that changing the atomic number or number of protons of an element utterly changes the identity of the element.
Learn more: https://brainly.com/question/18460120
what is a solid? what makes something a liquid?
Answer:
In matter a solid is anything that retains its shape and density when not confined.
a liquid is made up of a tiny particles of matter such as atom and it is also able to flow and take up a shape of any container.
how many micrometers are in 1.25 miles?
The threshold frequency for metallic potassium is 5.46×1014s-1 calculate the maximum kinetic energy and velocity that the emitted electron has the wave length of light shining on the potassium surface is 350nm(Me=9.11×1031kg)
Given :
The threshold frequency for metallic potassium is 5.46×1014 s⁻¹.
To Find :
The maximum kinetic energy and velocity that the emitted electron has the wave length of light shining on the potassium surface is 350 nm.
Solution :
We know, Maximum kinetic energy is given by :
[tex]K.E = \dfrac{hc}{\lambda}-h\nu_o\\\\K.E = h \times( \dfrac{3\times 10^8}{350\times 10^{-9}} -5.46\times 10^{14} )\\\\K.E = 6.626 \times 10^{-34}\times ( \dfrac{3\times 10^8}{350\times 10^{-9}} -5.46\times 10^{14} )\\\\K.E = 2.06 \times 10^{-19}\ J[/tex]
Hence, this is the required solution.
The kinetic energy of the electrons is 2.1 × 10^-19 J while the velocity of the electron is 6.78 × 10^5 m/s.
The work function of the metal is obtained as follows;
Wo = hfo
Wo = work function
h = Plank's constant
fo = threshold frequency
Wo = 6.63 × 10^-34 Js × 5.46 × 10^14 s-1 = 3.6 × × 10^-19 J
The energy of the incident photon is obtained from;
E = hc/λ
E = energy of incident photon
h = Plank's constant
c = speed of light
λ = wavelength of photon
E = 6.63 × 10^-34 Js × 3 × 10^8/350 × 10^-9
E = 5.7 × 10^-19 J
From the Einstein equation;
KE = E - Wo
KE = 5.7 × 10^-19 J - 3.6 × 10^-19 J = 2.1 × 10^-19 J
Since;
KE = 1/2mv^2
v = √2KE/m
v = √2 × 2.1 × 10^-19 J/9.11 × 10^-31kg
v = 6.78 × 10^5 m/s
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3.
Iron can be produced when iron (III) oxide reacts with carbon monoxide gas.
Fe2O3 (s) + 3C0 (g) → 2 Fe (s) + 3CO2(g)
11.5 g of Fe2O3 reacts with 2.63 x 10 24 molecules of CO. What mass of Fe is
expected? [10]
Answer: 23 g
the mol of Fe is 11,5/56 = 23/112 (mol)
the mol of CO is [tex]\frac{2,63.10^{24} }{6.10^{23} }= \frac{263}{60}[/tex] (mol)
we have:
Fe2O3 + 3CO => 2Fe + 3CO2
23/112 69/112 23/56
=> the mol of Fe is 23/56 mol
=> the mass of Fe is 23/56.56 = 23 (g)
Explanation:
What are the correct formulas and coefficients for the
products of the following double-replacement reaction?
RbOH + H2SO4
A) Rb2SO4 + 2H2O
B) Rb(SO4)2+ H2O
C) RbSO. + 2H2O
D) H3 Rb + SO, OH
[QUESTION TO EVERY SCARY MOVIE FANATIC] What is the most scary movie you ever seen? If you did see the most scary movie ever, what made it so scary for you?
Answer:evil dead 2013
Explanation:
this movie smack
Answer:
So I watched the purge which wasn't scary at all right but I watched the Nun and Anebeklle the conjuring and my cousin said that the Nun was the one possessing Anebelle after she was killed by the father of the girls during the purge and some other demon took over the Nuns soulless body since she had decided to possess the doll and the demon that possessed the Nun was Anabelle's previous owner and after hearing that I kept thinking about it for multiplretimes but I finally got over it 2 years ago.
xplanation:
Which of the following is an example of a compounds?
Select one:
a.Cu
b.CaCl2
c.Na
d.Nd
Answer:b.CaCl2
Explanation:
A compound is a substance resulting when two or more elements are are chemically bonded together either ionically or covalently in a fixed ratio.
From the given options we can see that the only compound there is CaCl2 which is an ionic compound in the fixed ratio of one calcium ion to two chloride ions.
Other options , Cu,Na and Nd are merely pure substance---Elements
Investigation: Cells are the basic unit of life.
Observe the two petri dishes, and record information about their appearance.
Day Petri dish (on left) containing agar plus
nutrients
1 Nothing happen
2 Nothing happen
3 The left one got more bacteria.
4 More bacteria started growing
5 It got more bacteria.
Petri dish (on right) containing agar
without nutrients
Nothing happen
Nothing happen
The bacteria started to go away,
More bacteria started going away
Bacteria kept going away
Conclusion:
Use your data to answer the following questions. Use complete sentences, and be as detailed as
possible.
THANK YOU SO MUCH!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
thank you so much!!
Explanation:
:D
How are these 3 types of rocks related/ similar?
Answer:
The rock cycle
Explanation:
The three types of rocks are related and connected through the rock cycle. Rocks are not formed independently of one another, the process of their formation are interconnected.
Igneous rocks are made from cooling and solidification of magma. These magma are derived from the melting of rocks that have been subjected to high temperature and pressure.
When igneous rocks are formed, they can follow two path ways. They either get transformed to sedimentary rocks or metamorphic rocks.
When igneous rocks are subjected to metamorphic conditions, their mineralogy is altered to form metamorphic rocks.
If igneous rocks gets weathered and broken down by agents of denudation, they end up getting transformed into sedimentary rocks.
Using only the groups of the periodic table, choose one element that is chemically similar to each of the following elements.
carbon
cesium
krypton
magnesium
aluminum
bromine
What does it mean for the energy levels in an atom to be quantized? Describe how this affects where electrons can be found
I'm really confused on this question, pls help