Answer:
Fe is limiting, and it will produce .0188 mols of Fe2O3
Explanation:
after you convert both Fe and O2 to mols by using their molar mass, you see there is less Fe than O2 so that is your limiting reactant. To find the amount of Fe2O3 you devide the limiting reactant by it's coefeciant (4) then multiply it by the products coefficant (2). Let me know if you have any questions
The equivalence point of a titration corresponds to which of the following?
O the point where equal volumes of acid and base have been used
O Equivalence point is another term for end point
All of the listed options are true
Equivalence point is defined as the point where the pH indicator changes color
O the point where the acid and base have been added in proper stoichiometric amounts
Answer:
E: the point where the acid and base have been added in proper stoichiometric amounts
Explanation:
Equivalence point in titration is simply the point where the amounts of acid and base used just sufficiently reacts chemically to cause neutralization whereas the endpoint is the point where the indicator of the titration changes colour.
The Equivalence point occurs before the endpoint.
Thus, option E is correct.
A solution has a concentration of 4.55x10^-2 H+ ions what is the pH
Answer:
1.34
Explanation:
PH can be calculated by taking the negative logarithm to the base ten of the hydrogen ion concentration
ipt While they have different functions in adults, the limb bones of several organisms all arise from the same
set of cells in the embryo's body. How does this evidence support the theory of evolution?
O A. It suggests there is a common ancestor between all of the organisms.
OB. It says that the cells randomly mutate in order to produce the limbs.
O c. It provides evidence that says that all organisms are actually the same as embryos.
OD. It tells scientists that evolution has caused the limbs to be different in the adult form.
Answer:
c
Explanation:
Answer:
Explanation:
The volume of 3.73 moles of a gas is 78.3 L at a certain temperature and pressure. At the same temperature and pressure, the moles of gas
that occupies 33.3 L is
Explanation:
) If I have 4 moles of a gas at a pressure of 5.6 atm and a volume of 12 liters, what is the temperature? P PV = nRT. 5.6 (12)=460821) T.
A buffer solution contains 0.329 M NaHCO3 and 0.246 M Na2CO3. Determine the pH change when 0.072 mol KOH is added to 1.00 L of the buffer. pH after ad
Answer:
The pH change is 0.22.
Explanation:
The pKa of the buffer NaHCO3/Na2CO3 is 10.329. To find the pH of this buffer we can use H-H equation:
pH = pKa + log [Na2CO3] / [NaHCO3]
Where pH is the pH of the buffer, pKa is 10.329 and [] could be taken as the moles of each specie.
As the initial volume of the buffer is 1.00L, the initial moles are:
[Na2CO3] = 0.246mol
[NaHCO3] = 0.329mol
Initial pH is:
pH = 10.329 + log [0.246mol] / [0.329mol]
pH = 10.20
The KOH reacts with NaHCO3 as follows:
NaHCO3 + KOH → NaKCO3 + H2O
Where NaKCO3≅ Na2CO3. That means the moles added of KOH are the increasing in moles of KOH and the moles of NaHCO3 that decreases.
Thus, moles after the addition of KOH are:
[Na2CO3] = 0.246mol + 0.072mol = 0.318mol
[NaHCO3] = 0.329mol - 0.072mol = 0.257mol
And pH is:
pH = 10.329 + log [0.318mol] / [0.257mol]
pH = 10.42
The pH change is:
10.42 - 10.20 =
0.22
Hey guys I really need help here, please answer this! I'd be most grateful :)
3. Besides the major types of radioactive decay, there are two others: positron emission and electron capture.
• Compare and contrast positrons with electrons.
• Explain how positron emission works and how it causes transmutations.
• Explain how electron capture works and how it causes transmutations.
• Compare the transmutations caused by positron emissions and electron capture.
I've been stuck on this problem for a while and it would mean a lot, thank you again!
Answer:
See Explanation
Explanation:
Positrons are often called positive electrons. They have the same mass and magnitude of charge as the electron but are of opposite sign. This means that they are positively charged while electrons are negatively charged.
In positron emission, a proton is converted into a neutron and a positron. The anti neutrino is a particle that balances the spins.
In electron capture, an electron is converted to a neutron. The anti neutrino is a particle that balances the spins.
When transmutation occurs by positron emission, the mass number of the of the parent nucleus is the same as mass number of the daughter nucleus but the atomic number of daughter nucleus decreases by 1 while the neutron/proton ratio increases.
When transmutation occurs by electron capture, the mass number of the of the parent nucleus is the same as mass number of the daughter nucleus but the atomic number of daughter nucleus decreases by 1 while the neutron/proton ratio increases.
Which of the following forces is the weakest?
Hydrogen Bonding
Ionic Bonds
Covalent Bonds
London-Dispersion Forces
Dipole-Dipole Interactions
Which of the following would be considered an Exothermic Reaction?*
Ice Melting
Burning wood
Boiling water
Baking a cake
Answer:
Burning wood
Explanation:
the fire releases heat into the air from the burning wood
If you have 3cm of each
substance, which would
have the MOST MASS
From the given graph, it is clear that the element with highest mass ate a volume of 3 cm³is lead and that with least mass is aluminium.
What is density?Density of a substance is the measure of its mass per unit volume. Thus, mathematically it is the ratio of mass to the volume. Therefore, as the mass increases density also increase.
Density of an element depends on its mass, volume, temperature and pressure. In periodic table, from left to right density decreases whereas down a group density increases.
From the graph showing the mass-volume-density relation it is clear that the element with with higher mass at a particular volume is lead and the element with least mass among the group is aluminium. The density of these elements also showing the same trend.
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A. If the mass of Hydrogen is 1 amu, what is the mass of Hydrogen in the reactant side of the equation above?
B. what is the mass of Hydrogen on the product side of the equation above?
Answer:
there are 4 hydrogen so
A.the mass of Hydrogen in the reactant side of the equation above is 1×4=4 amu.
B.the mass of Hydrogen on the product side of the equation above =1×4=4 amu.
Note: mass of reactant =mass of product.
A student is given the following information about an unknown solution:
● Dissociates 100%
● Feels slippery to the touch
● pH 13.5
A student is given the information like dissociates 100%, slippery in touch and have pH 13.5 about an unknown solution so the unknown solution is a strong base.
What pH value tells about?pH value of any solution tells about the acidity or basicity of the solution, according to the pH scale.
pH ranges from 0 to 14, acidic solutions have the pH range from 0 to 7, neutral solutions have pH 7 and basic solution have pH range from 7 to 14. In the question given that pH of the unknown solution is 13.5 which means that given solution is basic in nature. Also given that solution shows 100% dissociation, it means basic solution is strong as it shows full dissociation and slippery behavior is the physical property of bases.
Hence option (2) is correct i.e. Strong base.
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List or describe 2 chemical properties of gasoline
Answer:
The typical composition of gasoline hydrocarbons (% volume) is as follows: 4-8% alkanes; 2-5% alkenes; 25-40% isoalkanes; 3-7% cycloalkanes; l-4% cycloalkenes; and 20-50% total aromatics (0.5-2.5% benzene) (IARC 1989). ... Information regarding the chemical identity of gasoline is located in Table 3-l.
Explanation:
How many molecules are there in 3 moles of aluminum chloride ?
there are 4 atoms in aluminum chloride
True or False. And please show your work!
false I think? I could be wrong
Why does 50 g of copper require less heat (q) than 50 g of water, in order to raise the temperature by 15 oC? (Hint - the heat capacity may play a role, but how?)
Answer:
See Explanation
Explanation:
Specific heat capacity is an intensive physical property of matter. It is a measure of the quantity of heat that must be supplied in order to change the temperature of a unit mass of a substance by 1°C.
The specific heat capacity of a substance determines the quantity of heat that must be supplied in order to effect a temperature change of a unit mass of a substance. The higher the specific heat capacity of a substance, the greater the quantity of heat required to effect a temperature change in a given mass of the substance.
The specific heat capacity of water is 4,200 Joules per kilogram while the specific heat capacity of copper is 385 Joules per kilogram. Hence, the heat capacity of water is far greater than that of copper and consequently, 50 g of copper require less heat (q) than 50 g of water, in order to raise the temperature by 15 oC.
Convert 7.8 moles of carbon tetrafluoride into grams.
Answer:
686.43363984 is the answer when 7.8 moles is converted.
Use the drop-down menus to answer the questions about fronts and weather maps.
Cold fronts appear on weather maps in areas of .
Warm fronts appear on weather maps in areas of .
Answer:
Large temperature and air pressure decrease.
Temperature and air pressure increase.
Explanation:
The correct options about fonts and weather maps are:
Cold fronts appear on weather maps in areas of Large temperature and air pressure decrease.
Warm fronts appear on weather maps in areas of Temperature and air pressure increase.
What is a cold front and warm front?Similar to a cold front, there is usually a noticeable temperature change from one side of the warm front to the other.
A cold front occurs when colder air replaces warmer air, while a warm front occurs when warmer air replaces cold air.
Thus, the correct options are:
Cold fronts appear on weather maps in areas of Large temperature and air pressure decrease.
Warm fronts appear on weather maps in areas of Temperature and air pressure increase.
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Give the ratio that balances out the following equation: ___Cr + ___Pb(NO3)4 ---> ___ Cr(NO3)3 + ____ Pb
the doge has the answer
Pb(NO3)4
You need to make 7.2 L of 0.8 M Ca(C2O4) What molarity would the Ca(C2O4) need to be if you were to use only 3.5 L of it ?
Show work
Answer:
i think its 7.4
Explanation:j
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Robert Hooke observed a slice of cork under a microscope. He saw what looked like “pores” or “cells” in it. Hooke can assume that the cork is most likely - Answer F A man made material G A type of living organism H A type of mineral J A petroleum based product
The cork oak tree from which cork is extracted is native to southwest europe and northwest africa. Cork is extracted from cork oak trees without harming the tree. So cork is a type of mineral. The correct option is C.
What is a cork cell?The dead cells without having intercellular spaces are defined as the cork cells. They appear at the periphery of roots and stems when they grow older and increase in girth. They also have a chemical called suberin in their walls.
It is the suberin which makes them impervious to gases and water. The outer protective coat of a tree is called the cork. It is one of the components of bark of the tree. The tissues of bark become old and the secondary mersitem replaces them.
Cork is made up of multiple thick layers and it protects the tree from bacterial or fungal infection.
Thus the correct option is C.
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explain why hydrogen chloride does not conduct electricity, but a solution of hydrogen chloride and water conduct electricity
What is the pH of a 0.235 M Ba(OH)2 solution?
Answer:
13.672
Explanation:
2 moles of OH in Ba(OH)₂
0.235 M × 2 mol OH = 0.47 M OH
pOH = -log[OH-] ; pOH = -log[0.47 M OH] ; 0.328 = pOH (consider significant figures)
14 - pOH = pH because pH + pOH = 14
14 - 0.328 = 13.672 [there are three decimal places after the OH concentration, so there should be in the answer as well - 13.672]
In calorimetry, energy is measured through heat transfer from one substance to
another. Which of the following is NOT a method of heat transfer?
Answer:
Refraction
Explanation:
Calculate how many grams of methane (CH4) are in a sealed 800. mL flask at room temperature (22 °C) and 780. mm of pressure. Show work pls.
"0.0340" mol of CH₄ are in sealed flask.
Methane (CH₄)Methane would also be a greenhouse gas, therefore its existence tends to affect humanity's surface temp as well as weather patterns framework; it is released into the atmosphere from such a wide assortment of life forms as well as biogenic.
According to the question,
Volume, V = 800 mL or, 0.800 L
Temperature, T = 22°C or, 295
Pressure, P = [tex]\frac{780}{760}[/tex] = 1.03 atm
As we know the relation,
The gram of moles will be will be:
→ n = [tex]\frac{PV}{RT}[/tex]
By substituting the values, we get
= [tex]\frac{1.03\times 0.800}{0.08206\times 295}[/tex]
= [tex]\frac{0.824}{242.077}[/tex]
= 0.0340
Thus the response above is correct.
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Determine the pH of 1.0 x 10-10M NaOH
pH=
Answer:
4
Explanation:
Applying,
pH = 14-pOH.................... Equation 1
But,
pOH = -log(OH⁻)
Where OH⁻ = Hydroxyl ion concentration of NaOH.
From the question,
Given: OH⁻ = (1×10⁻¹⁰) M
Substitute these values into equation 1
pH = 14-log((1×10⁻¹⁰)
pH = 14-10
pH = 4
Hence the pH of NaOH with a molarity of 1.0 x 10-10M = 4
1. A volume of 120.0 liters of a gas is prepared at a pressure of 400.0 mm Hg and a temperature
100.0 °C. The gas is placed into a tank under high pressure. When the tank cools to 10.0°C,
the pressure of the gas is 20.0 mm Hg. What is the volume of the gas?
Answer:
[tex]V_2=2487.9L[/tex]
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to calculate the final volume by using the combined ideal gas:
[tex]\frac{P_2V_2}{T_2}=\frac{P_1V_1}{T_1}[/tex]
In such a way, by solving for the final volume, V2, we obtain:
[tex]V_2=\frac{P_1V_1T_2}{P_2T_1} \\\\[/tex]
Now, by plugging in the pressures, temperatures in Kelvins and initial volume, we will obtain:
[tex]V_2=\frac{(400.0mmHg)(120.0L)(283.15K)}{(20.0mmHg)(273.15K)}\\\\V_2=2487.9L[/tex]
Regards!
which ecosystem is the least stable
Answer:
cornfield
Explanation:
What is the volume of a balloon if it contains 3.2 moles of helium at a temperature of 20. °C and standard pressure?
Answer:
1.14 mol
Explanation:
The concept ideal gas law can be used here to determine the volume of the balloon. The volume of the balloon is 76.97 L.
What is ideal gas law?The combination of Boyle's law, Charles's law and Avogadro's law leads to an equation which gives the combined effect of change of temperature and pressure on the volume of a gas.
According to Boyle's law, V ∝ 1/P
According to Charles's law, V ∝ T
According to Avogadro's law, V ∝ n
On combining all these equations, the ideal gas equation is given as:
PV = nRT
P - Pressure
V - Volume
n - Number of moles
R - Universal Gas constant
T - Temperature
Here the standard pressure is 1 atm
20°C = 20 + 273 = 293 K
V = nRT / P
3.2 × 0.0821 × 293 / 1
= 76.97 L
Thus the volume of balloon is 76.97 L.
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Cu+k.HNO3 --> Cu(No3)2+..........+...........
Answer:
Cu + HNO3 → Cu(NO3)2 + H2O + NO2
Cu + 4HNO3 → Cu(NO3)2 + 2H2O + 2NO2 (balanced equation)
Explain the term orbital.
Answer: a mathematical expression describing the probability of finding an electron at various locations; usually represented by the region of space around the nucleus where there is a high probability of finding an electron
Explanation: