Answer:
oxygen
Explanation:
oxygen is very good for the health of every living thing
Answer:
C carbon dioxide
Explanation:
its bad
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.
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
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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Which of the following is constant in the universe?
A. Total energy
B. Total entropy
C. Total heat
D. Total temperature
Answer:
A
Explanation:
ez l.m.a.o.
if 6.2 mold of H2SO4 is dissolved to make 750 ml of sulfuric acid what is the molarity
Answer: The molarity of given solution is 8.26 M.
Explanation:
Given: No. of moles = 6.2 mol
Volume = 750 mL (1 mL = 0.001 L) = 0.75 L
Molarity is the number of moles of a substance present in a liter of solution.
Therefore, molarity of given solution is converted as follows.
[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{6.2 mol}{0.75 L}\\= 8.26 M[/tex]
Thus, we can conclude that the molarity of given solution is 8.26 M.
What is the mass number of sodium?
Answer: Since all sodium atoms have 11 protons, this one has 11 protons. This tells us that it also has 11 electrons. Since the mass number is 23, we know that the sum of protons and neutrons in the nucleus must equal 23.
So the answer is : Mass number = 23
Explanation:
When 12.00 moles of potassium chlorate decomposes, how many dm3 of oxygen are produced at 325K and 188 kPa?
2KClO3 →2KCl + 3O2
show work pls
Answer:
258.71 dm³
Explanation:
We'll begin by calculating the number of mole of O₂ produced by the decomposition of 12 moles of KClO₃. This can be obtained as follow:
The balanced equation for the reaction is given below:
2KClO₃ —> 2KCl + 3O₂
From the balanced equation above,
2 moles of KClO₃ decomposed to produce 3 moles of O₂.
Therefore, 12 moles of KClO₃ will decompose to produce = (12 × 3)/2 = 18 moles of O₂.
Finally, we shall determine the volume of the O₂. This can be obtained as follow:
Temperature (T) = 325 K
Pressure (P) = 188 KPa
Number of mole (n) = 18 moles
Gas constant (R) = 8.314 KPa.dm³/Kmol
Volume (V) =?
PV = nRT
188 × V = 18 × 8.314 × 325
188 × V = 48636.9
Divide both side by 188
V = 48636.9 / 188
V = 258.71 dm³
Thus, 258.71 dm³ of oxygen were obtained from the reaction.
Question 6 (4 points)
(08.02 MC)
What is the percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water? (4 points)
а
26.596
D
20.946
с
18.296
d
16.796
Answer:
20.9%
Explanation:
I took the test i hope this helps:)
The percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water is 20.93%. This is calculated using the definition (formula) of percentage by mass of a solution.
What is meant by percentage by mass?The mass percent of a solution is defined as the ratio of the mass of solute that is present in a solution, relative to the mass of the solution, as a whole.
The formula for percentage by mass is given as
percentage by mass = (mass of the solute/ total mass of the compound solution) × 100
Calculating percentage by mass for the given solution:The mass of the solute ( the chemical which is going to be dissolved) HCl
= 27.0 grams
The mass of the solvent (the substance in which a solute dissolve) water
= 102.0 grams
So, the total mass of the solution = 27.0 + 102.0 = 129.0 grams
Then, the percentage by mass = [tex]\frac{27.0}{129.0}[/tex] × 100 = 20.93%
Which is approximate equal to 20.946 at option B.
Therefore, the percentage by mass of solution formed by dissolving 27.0 grams of HCl in 102.0 grams of water is 20.93%.
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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.
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]
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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When two substances at room temperature are combined, the product feels HOT. What
kind of reaction is this?
Answer:
The correct answer is - exothermic reaction.
Explanation:
Exothermic reactions are the reaction that releases energy into the surrounding and does not require energy to take place due to the total energy of the reactants the total energy of the products is more than tthe total energy of the products. It releases energy usually as heat or light with the product.
In the given condition of room temperature mixing two substance produces hot products, fits with the explanation given above, therefore, it is an exothermic reaction.
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:
a sample of methane gas (ch4) with a mass of 58 g is kept in a 1.5 L container at a temperature of 373 K. what is the pressure of the gas?
Given :
A sample of methane gas (CH₄) with a mass of 58 g is kept in a 1.5 L container at a temperature of 373 K.
To Find :
The pressure of the gas.
Solution :
Moles of methane :
[tex]n = \dfrac{58\ gram}{16\ gram/mol} \\\\n = 3.625\ moles[/tex]
We know, by ideal gas equation :
PV = nRT
Here, R is ideal gas equation, [tex]R = 0.082 \ L \ atm\ mol^{-1} \ K^{-1}[/tex]
So,
[tex]P = \dfrac{nRT}{V}\\\\P = \dfrac{3.625\times 0.082 \times 373}{1.5}\ atm\\\\P = 73.92 \ atm[/tex]
Hence, this is the required solution.
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!
Convert 7.8 moles of carbon tetrafluoride into grams.
Answer:
686.43363984 is the answer when 7.8 moles is converted.
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.
explain why hydrogen chloride does not conduct electricity, but a solution of hydrogen chloride and water conduct electricity
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
The table below shows the average summer temperature increases for regions in Canada. Which of the following conclusions is supported by the data?
Answer:
The mountain regions are warming more than the coast
Explanation:
The average rise in temperature was the greatest in the mountains, and the coast average was less than the mountain average.
How many molecules are there in 3 moles of aluminum chloride ?
there are 4 atoms in aluminum chloride
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
0.850 moles of N2 originally at 85°C is cooled such that it now occupies 17.55L at 1.25 atm. What is the final temperature of the gas?
The final temperature of the gas is 269.9 K, or -3.25 °C, which was calculated with the help of ideal gas equation.
What is the ideal gas equation?The ideal gas equation gives the relation between pressure, volume and temperature.
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
To find the initial volume of the gas. We can use the fact that the number of moles of gas does not change during the cooling process:
n = 0.850 moles
We can also use the ideal gas law to find the initial volume of the gas:
PV = nRT
V = nRT/P
where R = 0.08206 L atm/K mol is the gas constant.
Convert the initial temperature from Celsius to Kelvin:
T1 = 85 °C + 273.15 = 358.15 K
Substitute the given values into the equation:
V₁ = (0.850 mol)(0.08206 L atm/K mol)(358.15 K)/(1 atm) = 24.03 L
Now we can use the combined gas law to find the final temperature:
(P₁V₁/T₁) = (P₂V₂/T₂)
Substitute the given values into the equation:
(1.25 atm)(24.03 L)/(358.15 K) = (P₂) (17.55 L)/(T2)
Solve for T₂:
T₂ = (P₂)(17.55 L)(358.15 K)/(1.25 atm)(24.03 L)
T₂ = 269.9 K
Therefore, the final temperature of the gas is 269.9 K, or -3.25 °C.
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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:
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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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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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:
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.
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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Which of the following forces is the weakest?
Hydrogen Bonding
Ionic Bonds
Covalent Bonds
London-Dispersion Forces
Dipole-Dipole Interactions