Answer: The empirical formula of X is [tex]Cr_2O_3[/tex]
Explanation:
If percentage are given then we are taking total mass is 100 grams.
So, the mass of each element is equal to the percentage given.
Mass of Cr = 68.4 g
Mass of O = 31.5 g
Step 1 : convert given masses into moles.
Moles of Cr =[tex]\frac{\text{ given mass of Cr}}{\text{ molar mass of Cr}}= \frac{68.4g}{52g/mole}=1.31moles[/tex]
Moles of O =[tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{31.5g}{16g/mole}=1.97moles[/tex]
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For Cr = [tex]\frac{1.31}{1.31}=1[/tex]
For O = [tex]\frac{1.97}{1.31}=1.5[/tex]
The simple whole number ratio of Cr : O= 2: 3
Hence the empirical formula is [tex]Cr_2O_3[/tex]
Endothermic change is when energy enters a system. True or false?
Answer:
I think its false im not sure
Explanation:
which factors cause earth to experience seasons? Check all that apply.
the speed of earth's rotation
the tilt of earth's axis
the directness of Sun's rays
the distance from the Sun
the distance from the equator
the altitude of an area
Answer:
B, C
Explanation:
Answer:
the tilt of Earth’s axis
the directness of the Sun’s rays
Explanation:
got it right on edge on 12-13-22
Describe the process of freezing ice cream in terms of heat flow.
Answer:
Freezing the mix is one of the most important operations in making ice cream, for upon it depend the quality, palatability, and yield of the finished product. Typically, freezing of ice cream is accomplished in two steps: (1) dynamic freezing, where the mix is frozen quickly while being agitated to incorporate air and to limit the size of ice crystals formed; and (2) static freezing, where the partially frozen product is hardened without agitation in a special low-temperature environment designed to remove heat rapidly. Although these steps primarily encompass freezing, or the formation of ice crystals, there are several other important processes that take place during this time that significantly impact the quality of ice cream. Both the dispersion of air bubbles and rearrangement of fat globules occur during the freezing steps.
Explanation:
Match the correct atom to its electronic configuration. please help!!thanks
Neon is the tenth element with a total of 10 electrons. So, the correct atom is neon.
if an atom with a mass number of 27 has 14 neutrons,it is an isotope of which element
Answer:
the number of neutrons in above isotope = A - Z = 27 - 13 = 14. Note: The molar mass of aluminium, which is average of atomic masses of all isotopes = 26.981538 g/mol, since 13Al27 is the major isotope.
Explanation:
Answer:
Aluminum
Explanation
mass number = number of protons + number of neutrons
Number of protons = mass number - number of neutrons
No of protons = 27-14 = 13
Aluminum contains 13 protons
what element is this
Answer:
neon
Explanation:
there are 10 protons
Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients. FE2O3(s) Fe(s) O2(g)
Answer:
2Fe₂O₃(s) → 4Fe(s) + 3O₂(g)
Explanation:
The unbalanced reaction is:
Fe₂O₃(s) → Fe(s) + O₂(g)To balance the oxygen atoms, we put a 2 before Fe₂O₃ and a 3 before O₂(g) - so as to make the total of O atoms in both sides 6 -:
2Fe₂O₃(s) → Fe(s) + 3O₂(g)There are four Fe atoms on the left side and only one on the right side, so we put a 4 before Fe(s):
2Fe₂O₃(s) → 4Fe(s) + 3O₂(g)Now the equation is balanced: there is an equal number of both Fe and O atoms in both sides of the equation.
How many protons, neutrons, and electrons does k^1+ have
Answer:
protons 19
nuetorns 20
electrons 19
metling point 63.65 C
Explanation:
MULTIPLE CHOICE QUESTION
If
you are warming yourself near the
campfire, you are experiencing heat
transfer from the fire, through:
Convection
Conduction
Radiation
Answer:
radiation
Explanation:
1. inspiration meaning
Answer:
inspiration means
the process of being mentally stimulated to do or feel something, especially to do something creative.
Answer:
The process of being mentally stimulated to do or feel something, especially to do something creative.
A local FM radio station broadcasts at an energy of 6.04E-29 kJ/photon. Calculate the frequency at which it is broadcasting.
Answer:
9.11×10⁷ Hz
Explanation:
From the question given above the following data were obtained:
Energy (E) = 6.04×10¯²⁹ KJ
Frequency (f) =?
Next, we shall convert 6.04×10¯²⁹ KJ to joule (J). This can be obtained as follow:
1 KJ = 1000 J
Therefore,
6.04×10¯²⁹ KJ = 6.04×10¯²⁹ KJ × 1000 J / 1 KJ
6.04×10¯²⁹ KJ = 6.04×10¯²⁶ J
Thus, 6.04×10¯²⁹ KJ is equivalent to 6.04×10¯²⁶ J.
Finally, we shall determine the frequency at which the FM radio station is broadcasting as follow:
Energy (E) = 6.04×10¯²⁶ J
Planck's constant (h) = 6.63×10¯³⁴ Js
Frequency (f) =?
E = hf
6.04×10¯²⁶ = 6.63×10¯³⁴ × f
Divide both side by 6.63×10¯³⁴
f = 6.04×10¯²⁶ / 6.63×10¯³⁴
f = 9.11×10⁷ Hz
Therefore, the frequency at which the FM radio station is broadcasting is 9.11×10⁷ Hz
The building blocks of DNA are like alphabet letters,
because they:
А: Are each associated with a particular sound
B: Can be used in a variety of languages
C: Each have an uppercase and a lowercase form
D: Spell out different instructions depending on their order
Help please
The gas in the discharge cell of a laser contains (in mole percent) 11% CO2, 5.3% N2, and 84% He. (a) What is the molar mass of this mixture
Answer:
[tex]MM_{mixture}=9.68g/mol[/tex]
Explanation:
Hello!
In this case, since the molar mass of gaseous mixtures can be determined via a weighted average containing the molar mass of each gas and the mole fraction (mole percent divided by 100) as shown below:
[tex]MM_{mixture}=x_{CO_2}M_{CO_2}+x_{N_2}M_{N_2}+x_{He}M_{He}[/tex]
Now, we plug in to obtain:
[tex]MM_{mixture}=0.11*44g/mol+0.053*28+0.84*4\\\\MM_{mixture}=9.68g/mol[/tex]
Best regards!
Which of the following is a compound?
Gold
Silver
Carbon Dioxide
Lead
Answer:
Carbon dioxide
Explanation:
Because CO2
water H2O is a molecule made of oxygen and hydrogen. The bonds that hold water molecules together are due to share ___, and known as covalent bonds.
A compound is found to contain 25.24 % sulfur and 74.76 % fluorine by weight. To answer the questions, enter the elements in the order presented above. 1. What is the empirical formula for this compound
Answer:
[tex]SF_5[/tex]
Explanation:
Hello!
In this case, when determining empirical formulas by knowing the by-mass percent, we can first assume we have 25.24 g of sulfur and 74.76 g of fluorine, so we compute the moles:
[tex]n_S=25.24g*\frac{1mol}{32.07g} =0.787mol\\\\n_F=74.76g*\frac{1mol}{19.00g}= 3.935mol[/tex]
Now, we divide the moles of both S and F by the fewest moles, in this case, those of S in order to determine the subscripts in the empirical formula:
[tex]S=\frac{0.787}{0.797}=1 \\\\F=\frac{3.935}{0.797}=5[/tex]
Therefore, the empirical formula is:
[tex]SF_5[/tex]
Best regards!
Which of the following best describes a galvanic cell?
A. Abattery that requires energy to charge it
B. A battery containing an acid and a base
C. A battery containing a spontaneous redox reaction
D. A battery containing a nonspontaneous reaction
Answer:
Your answer is C
Explanation:
The option that best describes a galvanic cell is that a battery containing a spontaneous redox reaction. That is option C.
A Galvanic cell is simply defined as an electrochemical cell that uses the movement of electrons in a reduction-oxidation reaction to produce electrical energy for use.
A Galvanic cell is a battery and is made up of a conducting electrolyte solution and two halve cells which include:
one half-cell of metal A(anode) electrode andone half-cell of metal B(cathode) electrode.In the galvanic cell a spontaneous redox reaction occurs which involves the transfer of electrons from anode to cathode with the release of energy.
Therefore, the option that best describes a galvanic cell is that it is a battery containing a spontaneous redox reaction.
What could possibly happen if we mix plan old powdered sugar with colorless,odorless sulfuric acid?PLEASE HELP
Chemistry conversion:
Convert 3.0099 dumps to wigs.
6375.23 dumps = 1 wig
Round your answer to 5 sig figs.
dumps and wigs are made up units for this question.
Answer:
0.00047212
Explanation:
Given parameters:
Quantity of dumps = 3.0099 dumps
Unknown:
Amount of wigs in this dumps = ?
Solution:
Since it is given that;
6375.23 dumps = 1 wig
To find 3.0099dumps;
3.0099 dumps = x wigs
6375.23x = 3.0099
x = [tex]\frac{3.0099}{6375.23}[/tex] = 0.00047212 wig
10. Which of these is not a mixture? *
O Oil and Water
O Sand and Soda
O Diet Soda
O They are all mixtures.
Answer:
They all are mixture I think.
The combustion of propane (C3H8) creates water and CO2. Looking at the
reaction below, which of the following would be the mole ratio between propane
and carbon dioxide? *
C3H8 +502->4H2O + 3C02
A)3 mole CO2 / 5 mole C3H8
B)3 mole C3H8/4 mole CO2
C)3 mole CO2 / 1 mole C3H8
D)3 mole C3H8 / 1 mole CO2
Answer:
C)3 mole CO2 / 1 mole C3H8
Explanation:
Which animal is a primary consumer in the Ethiopian Highlands?
Answer:
I believe it is the Ethiopian ibex
Explanation:
Answer:
I think it the Ethiopian ibex
Explanation:
im srry if it wrong.
hope this helps tho
A deer is running across a meadow at a speed of 15 m/s. Katie is riding in a car that is traveling at 25 m/s in the opposite direction as
the deer. To Katie, the deer appears to be moving at a speed of 35 m/s.
Joan is standing still beside the meadow. To Joan, the deer appears to be moving at a speed of 15 ms.
Why do Katie and Joan believe the deer is traveling at different speeds?
A. Joan is not able to see clearly.
B. They are not the same height and weight.
C. They have different frames of reference.
D.Katie's car is going too fast.
Answer:
D
Explanation:
Answer:
C they have different frames of reference
Explanation:
Which is the weakest type of intramolecular force/bond?
a. Polar covalent b. Ionic c. Metallic d. Nonpolar covalent
Answer:
Non polar covlant
Explanation:
Which of the following is a true statement? The narrow bay formed by the movement of glaciers are fjords. Coral reefs and sandbars form lagoons. Glaciers affect the size of lagoons. Glacier movements can produce distributaries.
Answer:
A the first one
Explanation:
Answer:
The Answer is fjords
Explanation:
Hope It Helps! Make Me Braninest
I will go to the app and give you brainly Est if u answer correctly ASAPPPPP
Answer:
C
Explanation:
I think it is C
All the radioactive elements are found in the last group of the Periodic Table.
True
False
Answer:
False
Explanation:
How is it possible that we have deserts if the water cycle provides water to earth's surface
Answer:
Even in a dry desert environment, the water cycle is taking place. The winds here blow up snow from the land and put it into the atmosphere, which is part of the water cycle. And the sun helps out, too, causing sublimation to occur, which causes snow to evaporate directly into water vapor gas
Explanation:
electromagnetic waves can travel through matter as well as across space.
True or false
true becouse i sed so
3. What do you notice about the temperature of the substance in the test tube after it is placed in the beaker of water?
A)The temperature of the substance remains the same as it sits in the beaker of water.
B) The temperature of the substance decreases as it sits in the beaker of water.
C) The temperature of the substance increases as it sits in the beaker of water.
Answer:
C: The temperature of the substance increases as it sits in the beaker of water
Explanation:
This question was taken from a video where an attempt was made to investigate the changes in temperature when a substance undergoes change from it's solid phase to its liquid phase.
To do this, as seen in the video online, it shows a solid substance in a test tube being placed in a beaker of water.
From observation, the water in the beaker has a warmer temperature than the solid substance present in the test tube and this in turn makes the test tube gradually increase in temperature.
Thus, the solid substance will as well increase increase in temperature when it is placed in the beaker of water.