Answer:
Atoms or molecules
Explanation:
Because if molecules are heated or colded the can be liquid or solid
How many moles of oxygen is required to produce 2.8 moles of water?
Answer:
2.8 moles
Explanation:
The formula for water is H2O, so one mole of water contains two moles of hydrogen and one mole of oxygen.
Here, the ratio of water particles to oxygen particles is one to one.
Therefore, in 2.8 moles of water, there are 2.8 moles of oxygen.
Hence, 2.8 moles of oxygen are required to produce 2.8 moles of water.
What characterizes a Crystaline solid when it breaks
Answer:
the break follows the crystal structure
4. Calculate the heat energy needed to heat 25.0 g of water from 13.0°C to 18.0°C. Use chart above for specific heat of water. Use units and show all work. ΔΗ=mcΔΤ AH=( XOXO AH= I 5. Calculate the heat energy needed to heat 25.0 g of aluminum from 13.0°C to 18.0°C. Use chart above for specific heat of water. Use units and show all work. ΔΗ=mcΔΤ AH=( 00 AH= 6. Calculate the heat energy needed to heat 45.0 g of copper from 23.0°C to 30.0°C. Use chart above for specific heat of water. Use units and show all work. Ah-meAT
Answer:
f
Explanation:
Describe how platelets function
Answer:
Platelets are tiny blood cells that help your body form clots to stop bleeding.
Explanation:
If one of your blood vessels gets damaged, it sends out signals to the platelets. The platelets then rush to the site of damage and form a plug (clot) to fix the damage.
[tex]\huge{\mathbb{\tt {ANSWER↓}}}[/tex]
Platelets are only about 20% of the diameter of red blood cells. The normal platelet count is 150,000-350,000 per microliter of blood, but since platelets are so small, they make up just a tiny fraction of the blood volume. The principal function of platelets is to prevent bleeding.#CarryOnLearning
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→XxKim02xXBalance the following reactions:
1. PbO2 → PbO + O2
Explanation:
2 moles of lead oxide ->
2PbO2 -> 2PbO + O2
Can someone help me with D
Answer: No
Explanation:
Epsom salts have different solubility in water compared to sugar.
A 10 kg package is delivered to your house.
Use one complete sentence to describe an example of how work is done on the package as it gets brought inside.
Make sure to use proper spelling, grammar, and other language mechanics.
In your explanation, make sure to use the terms related to the formula for work (W = Fd).
Answer:
Explanation:
Work is a net force applied through a distance in order to displace an object, commonly abbreviated as W. A net force is the sum of all forces acting on an object. Work is mass times acceleration and distance so to find out the work you simply calculate the acceleration of the box being brought in. Next find the distance it was carried to get in the house. Then find out the mass of the box and finally multiply those sums together to get the amount of work put in to bring the package inside.
What are some of the sources of pollution in south shore, chicago, where there are primarily people of color?
Answer:
Air pollution, Water pollution, disposal of hazardous waste, exposure to lead paint and vehicle traffic
Explanation:
On the west and South side of Chicago, the minority neighborhoods are affected by the exposure to toxic air pollution and other environmental health hazards such as Water pollution, disposal of hazardous waste, exposure to lead paint and vehicle traffic.
is alcohol a pure substance or a mixture
how many moles are there in 2.75L of a 2.0M solution
How many grams of carbon dioxide can be produced from 2.0 g of ethene and 2.9 g of oxygen?
Answer:
The reaction takes place is
2 (C2H6) + 7 (O2) → 4(CO2) + 6(H2O)
According to the equation,
60g ethane requires 7x32= 224g oxygen
here ethane is in excess.oxygen will be consumed completely.
hence
2.9 g O2 will consume 60×2.9/224=0.776g of C2H6
now,
2 moles of C2H6 produces 4 moles of CO2!
60g ethane produces 4x44 g CO2
hence amount of CO2 produced =4×44×0.776/60=2.27g
Please help me with this net ionic chem question I’ll mark you brainiest if it’s correct
Answer:
The answer is Co2+(aq) + 2 OH-(aq) -> Co(OH)2(s) so the answer is c.
Explanation:
2 Which two substances cause iron to rust?
Answer:
water and oxygen
Explanation:
this is because
iron + water + oxygen ----> hydrated iron (III) oxide (which is rust in lame terms )
hope this helps
please mark it brainliest
FREE BRAINLIEST!!!!! You have two objects. One is hot the other is cold (lack of heat). In what direction does the heat want to travel?
Answer:
the heat wants to travel up. Heat rises
Explanation:
The concentration of C6H12O6 may be represented as (C6H12O6) {C6H12O6} [C6H12O6]
Answer:
[tex][C_6H_{12}O_6][/tex]
Explanation:
Hello there!
In this case, since the concept of solution concentration is majorly used in terms of moles per liters of solution or molarity (M), it is also possible to represent this chemical unit by using squared brackets, [ ].
In such a way, when focused on the concentration of glucose, C6H12O6, we can use:
[tex][C_6H_{12}O_6][/tex]
Best regards!
What is the [OH) if the poH is 4.9?
a) 4.9 x 10-10 M
Ob) 1.0 x 10-4 M
C) 1.25 x 10-5 M
O d) 7.94 x 10-10 M
Answer:
the answer is 4.9×10-10M
3. Ions in the same group tend to form ions with the same
Answer:
Same charge.
Explanation:
Ions in the same group tend to form ions with the same charge. Elements belong to the same group on the periodic table form ions with the same charge because they have the same number of valence electrons. For example, all members of alkali metals have different number of shells but same number of electrons in their outermost shell so due to same number of outermost shell these alkali metals will make bonding with halogens which is a seven group that have seven electrons and needs one electron for attaining stability and forming ions on both atoms.
what does binding energy measure
Answer:
"Electron binding energy, more commonly known as ionization energy, is a measure of the energy required to free an electron from its atomic orbital or from a solid. ... The atomic binding energy of the atom is the energy required to disassemble an atom into free electrons and a nucleus."
Explanation:
Hope this helps! <33
God bless your heart <3333
have a wonderful day!
Binding energy is a required amount of energy that disperses the other particles of the reaction system. It measures the energy needed to free an electron or a subatomic particle.
What is binding energy?Binding energy is the ionization energy that depicts how much energy will be needed if an electron has to be removed from an atom for a reaction to occur.
It can be said that the energy required to free an electron from the orbit of the atom is measured in electron volt (eV). It is a little different from ionization energy as binding energy can remove any subatomic particle and not just an electron.
Therefore, the binding energy measures the freed subatomic particle.
Learn more about binding energy here:
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help it’s for today, not accepting links
How is Percent Composition of a molecule by atoms different than Percent Composition of a molecule by mass of?
Answer:
Percent composition by mulecules is: (mass of element/molecular mass) x 100
Percent composition by atoms is: (mass of element/molecular mass) x 100.
Explanation:
So their the same
Cutting, melting, bending, or crushing are examples of what kind of change?
Answer:
those are all physical changes and most physical changes can be undone like crushing a pice of metal you can flatten it back out you anwser is physical change
Explanation:
Answer:
It is a physical change because it can be reversed back and no new subtances is dormed.
Using the balanced reaction 2Al2O3 → 4Al + 3O2 determine the moles of Aluminum Oxide, Al2O3 produced when 85.5 grams of Aluminum Al is produced.
molar masses: Al2O3 = 85.962 O2= 31.998 Al = 26.982
A 1.58 mol
B 8.95 mol
C 6.34 mol
D 1.67 mol
Answer:
The correct option is option;
A. 1.58 mol
Explanation:
The given balanced chemical reaction is presented as follows;
2Al₂O₃ → 4Al + 3O₂
The given mass of Al produced = 85.5 grams
The given molar mass of Al₂O₃ = 85.962 g/mol
The given molar mass of O₂ = 31.998 g/mol
The given molar mass of Al = 26.982 g/mol
[tex]We \ note \ that \ the \ number \ of \ moles, \ n = \dfrac{Mass }{Molar \ mass}[/tex]
For the given produced Al, n = 85.5 g/(26.982 g/mol) ≈ 3.169 moles
From the given reaction, we have;
2 moles of Al₂O₃ produces 4 moles of Al
∴ 2/4 moles of Al₂O₃ produces 4/4 = 1 mole of Al
2/4 × 3.169 = 1.5845 moles of Al₂O₃ produces 1 × 3.169 = 3.169 moles of Al
∴ 1.5845 ≈ 1.58 moles of Al₂O₃ produces 3.169 moles of Al ≡ 85.5 grams of Al
The correct option is approximately 1.58 moles of Al₂O₃.
Show work, thanks
1. How many grams of AgNO3 are necessary to make 1.0 L of a 6.0 M stock solution?
2. How would you make 1.0 L of a 0.1 M solution of AgNO3 from your 6.0 M stock solution?
Answer:
Q.1
Given-
Volume of solution-1 L
Molarity of solution -6M
to find gms of AgNO3-?
Molarity = number of moles of solute/volume of solution in litre
number of moles of solute = 6×1= 6moles
one moles of AgNO3 weighs 169.87 g
so mass of 6 moles of AgNO3 = 169.87×6=1019.22
so you need 1019.22 g of AgNO3 to make 1.0 L of a 6.0 M solution
1. the grams of [tex]\rm AgNO_3[/tex] is 1019.22.
2. 10,192.2
What is molarity?Molarity is the measure of the concentration of any solute in per unit volume of the solution.
1. Volume is 1.0 l.
Molarity of solution -6 m
To find the mass of [tex]\rm AgNO_3[/tex]
[tex]\rm Molarity = \dfrac{n}{V}\\\\rm 6 = \dfrac{n}{1}\\\\n = 6 \times 1 = 6[/tex]
Mass of One mole of [tex]\rm AgNO_3[/tex] is 169.87 g
Therefore, the mass of 6 moles will be
169.87 × 6 = 1019.22
2. Molarity of solution 6.0
Volume of solution is 0.1m
The mass of 6 moles will be
169.87 × 6 = 1019.22
[tex]\rm density = \dfrac{mass }{volume} \\\\\rm density = \dfrac{1019.22 }{0.1} = 10,192.2[/tex]
Thus, the options are 1. 1019.22 2. 10,192.2
Learn more about molarity, here
31. Use the equation given below to answer the following question: If 755 kJ of heat was absorbed, what mass of carbon dioxide reacted?
2CO2 + 43.9 kJ → 2CO +O2
Answer:
1514g of CO₂ reacted
Explanation:
Based on the reaction:
2CO₂ + 43.9kJ → 2CO + O₂
2 moles of carbon dioxide require 43.9kJ of energy to produce 2 moles of carbon monoxide and 1 mole of oxygen
To solve this question, we must convert the 755kJ of energy to moles of carbon dioxide that reacts and to find the mass as follows:
755kJ * (2 moles CO₂ / 43.9kJ) =34.4 moles of CO₂ are produced
Mass CO₂: Molar mass: 44.01g/mol
34.4 moles CO₂ * (44.01g / mol) =
1514g of CO₂ reactedIf the man and the ball travels 90 m in 15 seconds, what is their average
speed?
Answer:
The average speed should be 6mps (6 meter per second)
Explanation:
90 divided by 15 = 6
A sample of Xe gas is observed to effuse through a pourous barrier in 4.83 minutes. Under the same conditions, the same number of moles of an unknown gas requires 2.29 minutes to effuse through the same barrier. The molar mass of the unknown gas is _____ g/mol.
Answer:
28.93 g/mol
Explanation:
This is an extension of Graham's Law of Effusion where [tex]\frac{R1}{R2} = \sqrt{\frac{M2}{M1} } = \frac{t2}{t1}[/tex]
We're only talking about molar mass and time (t) here so we'll just concentrate on [tex]\sqrt{\frac{M2}{M1} } = \frac{t2}{t1}[/tex]. Notice how the molar mass and time are on the same position, recall effusion is when gas escapes from a container through a small hole. The time it takes it to leave depends on the molar mass. If the gas is heavy, like Xe, it would take a longer time (4.83 minutes). If it was light it would leave in less time, that gives us somewhat an idea what our element could be, we know that it's atleast an element before Xenon.
Let's plug everything in and solve for M2. I chose M2 to be the unknown here because it's easier to have it basically as a whole number already.
[tex]\sqrt{\frac{M2}{131} } = \frac{2.29}{4.83}[/tex]
The square root is easier to deal with if you take it out in the first step, so let's remove it by squaring each side by 2, the opposite of square root essentially.
[tex](\sqrt{\frac{M2}{131} } )^2= (\frac{2.29}{4.83})^2[/tex]
[tex]{\frac{M2}{131} } = (0.47)^2[/tex]
[tex]{\frac{M2}{131} } = 0.22[/tex]
M2= 0.22 x 131
M2= 28.93 g/mol
Calculate the temperature of a gas when it is expanded to 5.25L. The gas originally occupies 3.90L of space at 252K.
Answer:
[tex]T_2=339K[/tex]
Explanation:
Hello there!
In this case, according to the Charles' gas law as way to understand the volume-temperature as a directly proportional relationship for this problem, we can write:
[tex]\frac{T_2}{V_2}=\frac{T_1}{V_1}[/tex]
Thus, given the initial temperature and volume and the final volume, we are able to calculate the final temperature as follows:
[tex]T_2=\frac{T_1V_2}{V_1} \\\\T_2=\frac{252K*5.25L}{3.90L}\\\\T_2=339K[/tex]
Best regards!
Body systems are groups of organs that work together to perform a specific function for the organism. Which body system is responsible for eliminating unused by-products excreted from cells and helping balance chemical and water concentrations within the body?
Answer:
It is Excretory system.
:)
I need help I need the answer ASAP.
Please help me with this net ionic chem question. I’ll mark you brainiest if you know it.
Answer:
B: 3k+ + 3OH¯ + Fe3+ + 3KOH = Fe3(H) + + 3NO3¯
Explanation:
Potassium hydroxide (KOH) reacts with iron (III).
The normal balanced equation is;
Fe(NO3)3 + 3KOH = Fe(OH)3 + 3KNO3
Now the ionic equation will be;
3k+ + 3OH¯ + Fe3+ + 3KOH = Fe3(H) + + 3NO3¯
7. The Fe+ ion present in acid mine drainage is colorless and surrounded 2 points
by water molecules. If phenanthroline (Phe) is added, the solution turns
orange as a colored complex is formed according to the equation
(Fe3+xH2O) + Phe <--> (Fe3+xPhe) + H20. The color is commonly used
as an indicator of the Fe+ ion concentration. What would an increase in
color from light to dark orange indicate in this system?
a. addition of water to the system
O
b. an increase in the rate of the reverse reaction
O
c. an applied stress that shifted the equilibrium to favor the forward reaction
d. an applied stress that shifted the equilibrium to favor the reverse reaction
Answer:
c. an applied stress that shifted the equilibrium to favor the forward reaction
Explanation:
We know that when a system is in a state of dynamic equilibrium, the imposition of a constraint on the reaction system will change the position of equilibrium and cause the equilibrium position to shift in a particular direction.
In this case, if we want the colour of the solution to move from light to dark orange, then we have to apply a stress to the system such that the equilibrium position is shifted forward (more (Fe3+xPhe) produced in the system). Hence the answer above.