Answer:
b
Explanation:
for the following reaction: 1 CuO + 1 H2 --> 1 Cu +1H2O, what is the quantity of moles of H2O when there are 240 grams of CuO present?
Considering the reaction stoichiometry, the quantity of moles of H₂O produced is 3.02 moles.
The balanced reaction is:
CuO + H₂ → Cu + H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
CuO= 1 moleH₂= 1 moleCu= 1 moleH₂O= 1 moleThe molar mass of the compounds present in the reaction is:
CuO= 79.55 g/moleH₂= 2 g/moleCu= 63.55 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of mass of each compound participate in the reaction:
CuO= 1 mole× 79.55 g/mole= 79.55 gramsH₂= 1 mole× 2 g/mole= 2 gramsCu= 1 mole× 63.55 g/mole= 63.55 gramsH₂O: 1 mole× 18 g/mole= 18 gramsThen, it is possible to determine the moles of H₂O necessary by the following rule of three: If by reaction stoichiometry 79.55 grams of CuO produces 1 mole of H₂O, 240 grams of CuO produces how many moles of H₂O?
[tex]molesofH_{2} O=\frac{240 grams of CuOx 1 mole ofH_{2} O }{79.55 grams of CuO}[/tex]
moles of H₂O= 3.02 moles
Finally, the quantity of moles of H₂O produced is 3.02 moles.
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brainly.com/question/11999193 brainly.com/question/15111313?referrer=searchResults brainly.com/question/9926203?referrer=searchResults brainly.com/question/6061451?referrer=searchResultsWhich of the following elements has only one electron in its outermost s orbital?
A. F
B. Al
C.Mg
D.Na
Answer:
D: Na
Explanation:
Hope this helps!
Have a nice day!!
:D
which of the following are examples of extensive properties?
Answer:
Mass, volume, width, height, etc.
Explanation:
Extensive properties depend on the amount of material where intensive properties (color, luster, taste, odor, density, temperature, melting/boiling point) don't.
A container contains three gases. If the partial pressure of carbon dioxide is 0.50 atm, the partial pressure of nitrogen is 0.30 atm, and the partial pressure of methane is 0.40 atm, what’s the total pressure inside the container?
Answer:
1.20 atm
Explanation:
A container contains three gases. If the partial pressure of carbon dioxide is 0.50 atm, the partial pressure of nitrogen is 0.30 atm, and the partial pressure of methane is 0.40 atm, what’s the total pressure inside the container?
Do not let chemistry questions SCARE you! The TOTAL means
ADD THEM UP.
You can do this without a scientific calculator :-)
0.50 +0.30 + 0.40 = 1.20 atm
Regular table salt is sodium chloride, NaCl. It is a bonding of an Na+ ion and a Cl- ion. Which of these ions is bigger?
Answer:
in the periodic table we can see that the ions of Cl is greater than the ions in Na
Cl- ion is bigger than Na+ ion because of the presence of more number of electrons.
The atomic number of sodium+ ion is 10 means it has 10 number of electrons which can accommodate into 2 shells or orbits while on the hand, chlorine- ion has atomic number 18 means it has 18 number of electrons which can be accommodate into 3 shells or orbit.
So there is one shell more in chlorine ion as compared to sodium ion which make the size of chlorine ion large so we can conclude that chlorine ion is bigger than sodium ion.
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Someone pls help me I will make you you brain
Answer:
i have no clue
Explanation:
umm cause i have no clue sorry lol but good luck
The mass lost by the positive electron should equal the mass gained by the negative electrode suggest two reasons why the results were not expected.
Answer:
The gain in mass by the negative electrode is the same as the loss in mass by the positive electrode. So the copper deposited on the negative electrode must be the same copper ions that are lost from the positive electrode.
difference between molicularity and order of reaction
Answer:
Molecularity is the number of ions or molecules that take part in the rate determining step
Order of reaction is the number of molecules of reactant whose concentration changes during the chemical change
Select the answer that completes each statement.
The
founded the Virginia colony.
The
government took over the Virginia colony because too many colonists had died.
and
worked on the tobacco plantations.
The
was the first elective governing body in a British colony.
Answer:
1 colonists
2 England
3 slaves
4 the House of Burgesses
Answer:
:)
Explanation:
What was the ratio in the formula for Iron (II)
oxide?
lete
What was the ratio in the formula for Iron (III)
oxide?
DONE
Answer:
In Iron (II) oxide, ratio is 1:1
In iron (III) oxide, ratio is 4:2
[tex].[/tex]
In Iron (II) oxide, ratio is 1:1
What is the importance of iron oxide?Iron oxides are very important components in most soils as they have major influence on chemical, physical, and microbial properties of soils. Because of their nanoparticulate size (usually 5-200 nm), iron oxides possess large specific surface area.
Generally, iron oxides are prevalent, widely used as they are inexpensive, and play an imperative role in many biological and geological processes. They are also extensively used by humans, eg, as iron ores in thermite, catalysts, durable pigments.
When iron is exposed to moisture or oxygen, oxidation occurs. During this chemical reaction, iron is converted into iron oxide. The iron oxide typically has a reddish, flaky appearance that becomes progressively worse over time.
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Someone pls help me I will make you brain
Answer:
its c I truly believe that it is c
Explanation:
how many electrons can occupy the 4p sublevel of a neutral atom of bromine
Answer:
6
Explanation
every p sublevel holds up to 6 electrons
so the 4p sublevel must hold up to 6 electonsr
If you increase the force on an object, its acceleration increases. True or false
Answer:
true
Explanation:
from Newton's second law of motion ,we can understand that acceleration of a body is directly proportional to the force applied on it and inversely proportional to its mass ,so as the force applied increase,the acceleration also increases
what does the theory of plate tetonics state
Answer:
Plate tetonics theory is the idea that different tectonic plates, are constantly moving and changing the surface of our Earth. They can move in three ways, convergent, divergent, and transform. Seafloor Spreading is like an example of divergent movement. When the plates diverge from each other it can create various changes such as creating a new sea floor. You can use seafloor spreading as an example of the plate tetonics theory.
Explanation:
1- Calcium Hydroxide + Calcium Bicarbonate
2- Calcium Bicarbonate + Sodium Carbonate
3- Calcium Sulphate + Sodium Carbonate
4- Sodium compound + Calcium Sulphate
5- Carbon dioxide + Calcium Carbonate
6- Calcium Bicarbonate + Calcium Carbonate
Remember these followings :-
Acid + Base = salt + water
Acid + metal = salt + hydrogen
Acid + carbonates = salt + water + carbon dioxide
Base + ammonium salt = salt + ammonia + water
Base + acidic oxide = salt + water
I hope that you will be clear via these formulas.
Help meeeeeeeeeeeeeee
Answer:
Copper = Cu
Gold = Ag
Iron = Fe
Potassium = K
Give an example of one pro and one con for the use of stem cells in medicine.
Answer:
pro ca help defeat diseases, con the stem cell might cause harm
Explanation:
The stem cells are used in regenerative medicine to reproduce the body organs and replace the damaged orangs. The disadvantage of stem cells is that it is difficult to culture the stem cells, and they can be transformed into cancerous cells.
What are stem cells?Embryonic stem cells can be described as pluripotent stem cells derived from the inner cell mass of a blastocyst. Human embryos can reach the blastocyst stage 4 to 5 days post fertilization, at which time they contain 50 to 150 cells.
Isolating the inner cell mass using immunosurgery results in the destruction of the blastocyst, a process that raises ethical issues, at the pre-implantation stage have the same moral considerations as embryos in the post-implantation stage of development.
Potential uses of stem cells include the treatment of diabetes and heart disease. The cells are being analyzed or studied to be used in clinical therapies, genetic disorders, and cellular/DNA repair. However, adverse effects in the research processes and clinical processes such as tumors and unwanted responses have been reported.
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Which process causes the greatest increase in the distance between particles?
Answer: The condensation is the process which causes distance.
Bohr models do not correctly show the location of electrons in an atom explain why they are still useful to predict bonding of atoms
Answer:
looo
rdyxvxkxkvxkgxkgdkvx
Explanation:
lolollkvvbffffkhdhlxkgzfjzufsfjsdhayzyrzruzruzufzktzkgdjfdufskdgjgzjfgkzjgskf
how do you determine the thermal energy of an object
Answer:
An object's thermal energy is dependent upon its temperature and mass. The higher the temperature of a given quantity of a substance, more is its thermal energy. Similarly, for the same temperature, higher mass of a substance will contain more thermal energy
Which two conversion factors would be used to convert the quantity of 4500 seconds into hours.
Answer:
the answer is A
Explanation:
in 60 seconds there is 1 minute and in 60 minutes there is one hour
Someone pls help me I will make you brain
what is the empirical formula of a compound that consists of 0.039 moles of iron atoms combined with 0.052 moles of oxygen atoms?
The empirical formula of a compound that consists of 0.039 moles of iron atoms combined with 0.052 moles of oxygen atoms is FeO[tex]\rmFeO_{2}[/tex].
What is empirical formula?The simplest whole number ratio of atoms in a compound is the empirical formula of a chemical compound in chemistry. Sulfur monoxide's empirical formula, SO, and disulfur dioxide's empirical formula are two straightforward examples of this idea.
The simplest whole number ratio of each type of atom in a compound is its empirical formula. It can be determined from data on the mass of each component in a compound or from the composition's proportion.
calculation:
Fe = 56/0.039 = 150
O = 16/0.052 = 300
in simplest term ratio is 1:2
Thus, empirical formula is FeO[tex]\rmFeO_{2}[/tex].
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a student reacted 40 drops of an unknown amine with 20 drops of iodomethane in 2 ml of a suitable solvent mixture. after 15 minutes of reaction, a white precipitate formed. the precipitate was isolated and its melting point was recorded to be 178 °c. what could this precipitate be?
The compound formed is the quaternary ammonium salt N,N,N-trimethyl-1-phenylmethanaminium iodide.
Quaternary ammonium salts are formed when methyl iodide reacts with an amine. The quaternary ammonium salt is an ionic substance which often has a high melting point. Remember that the melting point of a substance can be used to identify the substance.
In this case, a student reacted 40 drops of an unknown amine with 20 drops of iodomethane in 2 ml of a suitable solvent mixture. after 15 minutes of reaction, a white precipitate formed. the precipitate was isolated and its melting point was recorded to be 178 °c. This precipitate must be N,N,N-trimethyl-1-phenylmethanaminium iodide (Benzyltrimethylammonium iodide) because it is a quaternary ammonium salt whose melting point is 178 °c.
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Someone pls help me I will make you brain
Answer:
human migration
Explanation:
Answer:
I think its D
Explanation:
During chemical reactions__________are broken and___________to form
new substances with different properties, but mass is still_____________ .
Answer:
1st blank : Atoms
2nd blank : Reactants
I'm still trying to find the 3rd blank. I'll put it in comments if I find it
Explanation:
Hope this helps :)
Pls make brainliest :}
And have an amazing day <3
Assume that wave B has a wavelength of 415 nm. Calculate the frequency of the wave. The value for c is 3.00 x 10 8 m/s. The wavelength of wave A is [__________]Hz.
The wave B has wavelength of 415 nm. The value for c is 3.00 x 10 8 m/s. The frequency is 7.22 x 10¹¹ Hz.
What is frequency?Frequency is defined as the number of waves passing through a fixed point in a given amount of time.
The frequency can also be defined as a repeated event is the number of occurrences per unit of time.
Frequency can be expressed as
f = c / ∧
Where c = 3.00 x 10⁸ m/s
∧ = 415 nm
So, f = 3.00 x 10⁸ m/s x 415 nm
f = 7.22 x 10¹¹ Hz.
Thus, the wave B has wavelength of 415 nm. The value for c is 3.00 x 10 8 m/s. The frequency is 7.22 x 10¹¹ Hz.
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Can a non-metal replace a metal in a single replacement reaction? If yes, is a non-metal always not able to replace a metal in a single replacement reaction?
Non-metals will never replace metals or vice versa, they'll only replace itself or the only type of reaction that it is or element that it is.
Select the part that contains the information that a plant cell uses for growth and activities.
a. golgi b. vacuole c. chromosomes d. chloroplasts
The part that contains the information that a plant cell uses for growth and activities is known as Chromosome. Thus, the correct option for this question is C.
What are Chromosomes?Chromosomes may be defined as thread-like structures that appear during cell division. These structures are present in the nucleus of the cell and are made up of DNA, RNA, histones, and some non-histone proteins.
Chromosomes were first discovered by E. Strasburger in 1875. But the term chromosome was given by Waldeyer in 1888. Ultimately, the nucleus of the cell contains all sorts of genetic information which are essential for the growth and activities of organisms.
The Nucleus contains DNA which is known as the genetic material of most organisms including plants.
Therefore, a chromosome is a part that contains the information that a plant cell uses for growth and activities. Thus, the correct option for this question is C.
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Help meeeeeeeeeeeeeee
Answer:
whatttttttttttttttttttttttt
Answer:
Breaking glass - chemical change
popsicle - physical
milk - chemical
bread - physical
roasting - chemical
egg - chemical
fireworks - chemical
mixing something with water - chemical
popcorn - chemical
colouring hair - physical
melting chocolate - physical
crumpled paper - physical
rusted nails - chemical
crushed can - physical
cooked egg - chemical
bending metal - physical
melting ice - physical
bleaching clothes - chemical
If u want to differentiate between chemcial and physical change u need to remember this-
physical change - no new substance is formed (Even for melting of ice it's still water) and it can be reversible, except for some cases like tearing of paper
chemical change - a new substance is formed
