The pressure of a gas sample was measured to be 654 mmhg. What is the pressure in kpa? (1 atm = 1. 01325 × 10 5 pa)
Taking into account the change of units, the pressure of the gas sample is 87.19 kPa.
What is rule of threeIn first place, the rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
That is, what is intended with it is to find the fourth term of a proportion knowing the other three.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied.
To solve a direct rule of three, the following formula must be followed, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: [tex]c=\frac{cxb}{a}[/tex]
PressureThe direct rule of three is the rule applied in this case where there is a change of units.
To perform in this case the conversion of units, you must first know that:
1 atm= 760 mmHg1 atm = 1. 01325×10⁵ Pa= 101325 Pa1 kPa= 1000 PaSo, if 1 atm is 760 mmHg, how many atm equals 654 mmHg?
760 mmHg ⇒ 1 atm
654 mmHg ⇒ x
So: [tex]x=\frac{654 mmHgx1 atm}{760 mmHg}[/tex]
Solving:
x=0.86 atm
Now, if 101325 Pa are 1 atm, how many Pa equals 0.86 atm?
1 atm ⇒ 101325 Pa
0.86 atm ⇒ x
So: [tex]x=\frac{0.86 atmx101325 Pa}{1 atm}[/tex]
Solving:
x= 87,192.83 Pa
Finally, if 1 kPa is 1000 Pa, how many kPa equals 87,192.83 Pa?
1000 Pa ⇒ 1 kPa
87,192.83 Pa ⇒ x
So: [tex]x=\frac{87,192.83 Pax1 kPa}{1000 Pa}[/tex]
Solving:
x=87.19283 kPa≅ 87.19 kPa
In summary, the pressure of the gas sample is 87.19 kPa.
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pls help.
Dr. AT is studying the effect playing music has on plant growth. To do this she sets up three greenhouses each growing pea plants. One of the greenhouses plays classical music to the plants all day, the second greenhouse plays pop music, while the third is silent. All other factors, such as water and sunlight are identical between the three greenhouses. After two weeks, Dr. AT measures each pea plant and records her data. What greenhouse is the control group in this experiment?
A. The silent greenhouse.
B. The pop music greenhouse.
C. The classical music greenhouse.
D. The height of the plants.
Answer:
c or d
Explanation:
it says it was playing classic music
In this case, the control group or control variable is the greenhouse where the plants are grown in silence, as this group does not receive any music treatment. Therefore, the correct answer is A.
Variables can be defined as any characteristics, number or a quantity that can be measured . It is also called as a data item . It is called as variable because it can vary and can also have wide variety of values.
There are 3 types of variables 1) manipulated variable where the condition is specified, 2) responding variable which is dependent on the manipulated variable 3)controlled variable which does not change.
In this experiment, the control group is the group that does not receive the experimental treatment and serves as a basis for comparison.
Thus, the correct answer is A , the silent greenhouse.
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What are the conditions needed for reaction to happen in aldehydes and ketones?
Please help thank you
Explanation:
You may not realise it, but you come across aldehydes and ketones many times a day. Take cakes and biscuits, for example. Their golden, caramelised crust is formed thanks to the Mailliard reaction. This is a process that occurs at temperatures above 140° C, when sugars with the carbonyl group in foods react with nucleophilic amino acids to create new and complex flavours and aromas.
Another example is formaldehyde. Correctly known as methanal, it is the most common aldehyde in industry. It has multiple uses, such as in tanning and embalming, or as a fungicide. However, we can also react it with different molecules to make a variety of more useful compounds. These include polymers, adhesives and precursors to explosives. But how do aldehydes and ketones react, and why?You should remember from Aldehydes and Ketones that they both contain the carbonyl functional group , . This is a carbon atom joined to an oxygen atom by a double bond. Let's take a closer look at it.
If we compare the electronegativities of carbon and oxygen, we can see that oxygen is a lot more electronegative than carbon.
Which conclusion is consistent with the following net ionic equation? co2+(aq) + s2-(aq) cos(s)
The conclusion that is consistent with the ionic equation would be that COS (s) is a precipitate.
What is a precipitation reaction?It is a reaction in which 2 soluble salts in aqueous forms react to produce an insoluble salt as one of the reaction's products.
Precipitate products are usually insoluble and can be filtered off using suitable filter paper. In other words, they are solids that are suspended in solution.
Following the ionic reaction, the two reacting ions are in aqueous forms while the product formed is solid.
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1
2
3
4
5
6 7 8 9 10
If the density and volume of an object is known, what can also be found?
the mass of the object
O the shape of the object
the size of the object
the thickness of the object
In 2007, the population of Canada was 1.26 × 108, the population of Mexico was 10.6 × 107, the population of Brazil was 13.6 × 107, and the population of China was 1.86 × 109. Which two countries have the highest population?
A. Canada and China
B. Mexico and China
C. China and Brazil
D. Brazil and Mexico
45.8 grams of copper requires 1172 J of heat to reach a final temperature of 100.5 ℃. What was the initial temperature? Specific heat of copper is 0.385 J/g℃. (7.02)
A. 66.5[?][?][?]
B. 122[?][?][?]
C. 34.0[?][?][?]
D. 75.2[?][?][?]
I also have no idea what the [?][?][?] is. Can someone please help me for 25 points? :'(
Answer: Option A, 66.5
Explanation:
So you want to use the heat capacity formula
So, q(heat)=m(mass) * cp (specific heat) * DeltaT (change in temp)
so m=45.8, cp =0.385, q=1172
you dont have the final temp for DeltaT so you have to fill in and divide
1172 = (45.8) * (0.385) * Delta T
1172 = 17.633 * DeltaT (Now divide)
1172/17.633 = Delta T
66.46 = Delta T, rounded you get 66.5 or option A
Which of the following processes does not facilitate containment?
OA. Enrichment of uranium-235 is done.
B. Steel-reinforced concrete several feet thick surrounds the plant.
C. Workers wear protective clothing.
D. The water used to cool the fuel rods is enclosed.
SUBMIT
Enrichment of uranium-235 is done. Hence, option A is correct.
What is the meaning of containment?The act, process, or means of keeping something within limits the containment of health costs.
Enrichment is a process of increasing the proportion of fissile isotope found in uranium ore (represented by the symbol 'U') to make it usable as nuclear fuel or the compressed, explosive core of nuclear weapons.
Hence, option A is correct.
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Write the formula and calculate the molecular mass of
1) Soda ash
2) Baking Soda
3) Lime Stone
4) Ethanol
5) Common Salt
The molecular formula is the sum of the atomic masses of all atoms in the molecule.
The formula of Soda Ash:
Na₂CO₃ is also known as Sodium Carbonate.
The molecular mass of Soda Ash is
(2×Na)+(1×C)+(3×O)=106g/mol
The formula of Baking Soda:
NaHCO₃ is also known as Sodium bicarbonate.
The molecular mass of Baking Soda is
(1×Na)+(1×H)+(1×C)+(3×O)=84g/mol
The formula of Lime Stone:
CaCO₃ is also known as Calcium carbonate.
The molecular mass of Lime Stone:
(1×Ca)+(1×H)+(1×C)+(3×O)=100g/mol
The formula of Ethanol:
C₂H₅OH is the formula of ethanol.
The molecular mass of Ethanol:
(2×C)+(6×H)+(1×O)=46g/mol
The formula of Common Salt:
NaCl is also known as Sodium chloride.
The molecular mass of Common Salt:
(1×Na)+(1×Cl)=58.5g/mol
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A car's tires are inflated to 2.11 atm at 25c. after driving to the grocery store, the tires are at 2.25 atm. what is the temperature of the air in the tire after the drive?
Answer:
T₂ = 26.7 °C
Explanation:
Because you are dealing with pressure and temperature, you can use Gay-Lussac's Law to find the final answer. The equation looks like this:
P₁ / T₁ = P₂ / T₂
In this form, "P₁" and "T₁" represent the initial pressure and temperature. "P₂" and "T₂" represent the final pressure and temperature. You have been given the values for all of the variables but "T₂". Therefore, by plugging these values into the equation, you can simplify to find "T₂".
P₁ = 2.11 atm T₁ = 25 °C
P₂ = 2.25 atm T₂ = ?
P₁ / T₁ = P₂ / T₂ <--- Gay-Lussac's Law equation
(2.11 atm) / (25 °C) = (2.25 atm) / T₂ <--- Plug variables into equation
0.0844 = (2.25 atm) / T₂ <--- Divide 2.11 by 25
(0.0844) x T₂ = 2.25 atm <--- Multiply both sides by T₂
T₂ = 26.7 <--- Divide both sides by 0.0844
Enzymes use several types of catalytic mechanisms. Differentiate between acid-base catalysis, covalent catalysis, and metal ion catalysis.
In catalysis and base catalysis, a chemical reaction is catalysed by an acid or a base.
Covalent catalysis involves the formation of a covalent bond.
Metal ions contribute to the catalytic process through their ability to attract or donate electrons.
What are enzymes?An enzyme is a biological catalyst and is almost always a protein. It speeds up the rate of a specific chemical reaction in the cell.
In catalysis and base catalysis, a chemical reaction is catalysed by an acid or a base. by Bronsted - Lowry acid-base theory, the acid is the proton ( hydrogen ion, H+) donor and a base is the proton accentor typical reaction catalyzed by proton transfer are esterifications and aldol reactions .
Covalent catalysis involves the formation of a covalent bond between the enzyme and at least one of the substrates involved in the reaction. Often times this involves nucleophilic catalysis which is a subclass of covalent catalysis.
Metal ions are essential for the catalytic action of some enzymes. Metal ions contribute to the catalytic process through their ability to attract or donate electrons. Some metals bind the substrate by coordination links. Others contribute to maintaining the tertiary and quaternary structures of the enzyme molecule.
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1.How many sodium ions are there in 78.6 g of sodium phosphate?
Answer:
two
Explanation:
Which of the mentioned are the principal constituents of an organic compound?
O
O
O
Carbon, Oxygen and Nitrogen
Carbon, Oxygen and Hydrogen
Carbon, Oxygen and Sulphur
Carbon, Oxygen and Sulphur
Answer:
the basic element of organic compounds is carbon and they are called organic because associate with the living organism so the correct answer is
4.0 mol Na2S reacts with 5.0 mol
CuSO4 according to the equation below:
Na₂S + CuSO4 → Na₂SO4 + CuS
How many moles of Na2SO4 form from 5.0 moles of CuSO4?
[?] mol Na₂SO4
Round your answer to the tenths place.
The number of moles of [tex]Na_2SO_4[/tex] form from 5.0 moles [tex]Na_2S[/tex] is 5 moles.
What is a limiting reactant?Limiting reactants are those reactants that are completely used up in a chemical reaction.
4.0 mol [tex]Na_2S[/tex] will be completely used since the combining ratio is 1 : 1 : 1.
[tex]Na_2S + CuSO_4[/tex] ->[tex]Na_2SO_4 + CuS[/tex]
From the chemical equation above, 5.0 moles [tex]Na_2S[/tex] will yield 5 moles of [tex]Na_2SO_4[/tex].
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Why are reaction orders not always equal to the coefficients in a balanced chemical equation?
The reaction order is given as the relationship between the concentrations of the reactants and the rate of a reaction.
The order of a rate law is the sum of the exponents of the concentration of the reactants.The rate law of a reaction is used to understand the composition of the reaction mixture. Specifically, the reaction order is the exponent to which the concentration of that reactants are raised, and it indicates that how well the concentration of a reactants affects the rate of a reaction.There are number of methods used to determine the reaction order. Reaction orders not always equal to the coefficients in a balanced chemical equation , it only determined the number of molecules per mole present in a given reaction.Learn more about order of reaction here..
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PLS HELP ME ASAP ILL GIVE BRAINLIEST
Which statement best describes how a Geiger counter works?
Select one:
a. Water vapor condenses along a path traveled by ionizing radiation.
b. Particles ionized by radiation cause black streaks to appear on sensitive photographic paper.
c. Radioactive particles ionize argon gas in a tube and the resulting electric current is amplified and heard as a clicking sound.
d. A material sensitive to radioactive emissions glows when mixed with a radioactive substance.
Answer:
the answer is c
Explanation:
c. Radioactive particles ionize argon gas in a tube and the resulting electric current is amplified and heard as a clicking sound.
The table compares the number of electrons in two unknown neutral atoms.
Comparison of Electrons
Atom Number of Electrons
A9
D11
Use this information to determine the number of valence electrons in the atoms. Which of the following correctly compares the stability of the two atoms?
O Both are unreactive.
O Both are highly reactive.
OA is unreactive and D is reactive.
OA is reactive and D is unreactive.
Answer: Both are highly reactive.
Explanation:
A is fluorine, which only needs to gain one more electron to have a full valence shell. Thus, it is reactive.
D is sodium, which only needs to lose one electron to have a full valence shell. Thus, it is also reactive.
3.the three major types of radioactive decay of an unstable nucleus are alpha particles, beta particles, and gamma rays.
explain how alpha decay works and how it causes a transmutation. be sure to note all changes to the nucleus in your explanation.
write the equation for the alpha decay of uranium-234.
explain how beta decay works and how it causes a transmutation. be sure to include all changes to the nucleus in your explanation.
write the equation for the beta decay of iodine-131.
a) Alpha decay occurs when an unstable nuclide emits an alpha particle, (which is just a helium-4 atom), which contains 2 protons and 4 neutrons. This means that transmutation has occurred (since a nuclide of a different element will be produced), and this newly produced nuclide will have 2 fewer protons and 4 fewer neutrons than the original nuclide.
b) [tex]^{234}_{92} \text{U} \longrightarrow ^{4}_{2} \text{He}+^{230}_{90} \text{Th}[/tex]
c) Alpha decay occurs when an unstable nuclide emits a beta particle, (also known as an electron). This causes transmutation (since a nuclide of a different element will be produced), and this newly produced nuclide will have 1 more proton than the original nuclide.
d) [tex]^{131}_{53} \text{I} \longrightarrow ^{0}_{-1} \beta+^{131}_{54} \text{Xe}[/tex]
Sample H is a mineral found in this sand! This mineral is black and will stick to you when you walk through the sand at the beach. Zoom in really close - sand is very cool to look at when it is magnified. We will look at more later in the class. The sand grains that you should focus on are black. Not all of the black grains are the same mineral however the mineral you're looking for is strongly magnetic. If you ran a magnet just over the top of this sample, some of black sand grains would stick. What mineral is it?
The mineral that's illustrated based on the information given will be magnetite.
What is a mineral?A mineral simply means any pure substance that has a unique composition and structure.
Since the mineral is black and will stick to you when you walk through the sand at the beach, it's magnetite.
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can y'all please help me with this
Answer:
C=8,H=8 and O =3
Explanation:
As the formula is given.
When the sun runs out of hydrogen in its core, it will become larger and more luminous because:.
Answer:
Faster hydrogen burning means the star will grow larger and more luminous to allow the extra energy created to escape
it starts fusing hydrogen in a shell around a helium core.
Which word equation shows Hydrogen reacting with oxygen to form water
Answer:
H + 02 = H2O
Explanation:
Willing to give Anyone 17+ points to anyone who can help with this. Barium can form ions with a +2 charge. Is it a cation or an anion?
Barium can form ions with a +2 charge and it is called a cation.
Ex:- Ba(s)+2HCl(aq)→BaCl2(aq)+H2(g)
In this redox reaction,
initially, barium shows 0 (s) oxidation no. and after forming the product its oxidation no. changes to +2 (in aq).
When a metal loses electrons and a nonmetal gets those electrons, cations (positively charged ions) and anions (negatively charged ions) are created.
Ionic bonds are created when a metal and a nonmetal interact. The position of an element on the periodic table can frequently tell you what charge an ion generally carries:the alkali metals (the IA elements) lose a single electron and form a 1+ charge. the alkaline earth metals (IIA elements) lose two electrons and form a 2+ cation.IIIA family member aluminum loses three electrons to become a 3+ cation.Seven valence electrons are shared by all of the halogens (VIIA elements) and each of them has a single negative charge, forming an anion.The VIA elements pick up two electrons to create 2- charged anions.The VA elements pick up three extra electrons to create 3- charged anions.To know more about elements of the periodic table refer to:-
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Two persons are not equally strong. One is weaker than another. They are going to carry a wooden coat poole Suggest them the w a way to cargy. a wooden pole. In such a way stronger person needs to apple-apply more effort and the weakes person need to apply less force. Explain with scientific reason.
Answer:
The two men can arrange a position such as the center of gravity must be nearer the stronger man and the weaker man must be away from the center of gravity of the wooden pole.
In plain language, the stronger man must be near the center while the weaker man must be away from the center of the wooden pole.
Explanation:
I am sachhyam lama
from nepal
my teacher wrote this answer thats why I wrote the answer
Considering the activity series given below for metals and nonmetals, which reaction will occur? Al > Mn > Zn > Cr > Fe > Cd > Co > Ni > Sn > Pb > H > Sb > Bi > Cu > Ag > Pd >Hg > Pt F > Cl > Br > I
(a) 2NaBr + I2 --> 2NaI + Br2
(b) 2Fe + Al2O3 --> 2Al + Fe2O3
(c) 2AgNO3 + Ni --> Ni(NO3)2 + 2Ag
(d) Pb + Zn(C2H3O2)2 --> Zn + Pb(C2H3O2)2
(c) 2AgNO3 + Ni --> Ni(NO3)2 + 2Ag
Using the conclusion from ruthefords model, identify a charged subatomic particle that is located in the nucleus
You could say either protons or neutrons.
3. Which nuclear radiation is similar to high energy X-rays?
beta
alpha
gamma
neutron
Answer: Gamma radiation
Explanation:
Gamma rays have high penetrating power, similar to high-energy X-rays.
If you have half a mole of octane (c8h18), how much water is produced? 2c8h18 + 25o2 --> 16co2 + 18h2o
Answer:
4.5 moles H₂O
or
81.072 g H₂O
Explanation:
I am not exactly sure whether you want moles H₂O or grams H₂O. So, I'll calculate both. To find the moles H₂O, you'll need to covert moles C₈H₁₈ to moles H₂O via the mole-to-mole ratio from the reaction coefficients. To find the grams H₂O, you need to convert moles H₂O to grams H₂O via the molar mass.
2 C₈H₁₈ + 25 O₂ ---> 16 CO₂ + 18 H₂O
0.5 mole C₈H₁₈ 18 moles H₂O
----------------------- x ------------------------- = 4.5 moles H₂O
2 moles C₈H₁₈
Molar Mass (H₂O): 2(1.008 g/mol) + 16.00 g/mol
Molar Mass (H₂O): 18.016 g/mol
4.5 moles H₂O 18.016 g
---------------------- x ---------------- = 81.072 g H₂O
1 mole
A chemical change Group of answer choices occurs when powdered lemonade is stirred into water. occurs when methane gas is burned. occurs when water is vaporized. occurs when salt is dissolved in water. occurs when paper is shredded.
A Chemical change occurs when methane gas is burned.
What is Chemical change ?A chemical change is a change of materials into another, new materials with different properties and one or more than one new substances are formed.
A chemical change occurs when matter undergoes a change to form a new substance with different chemical properties, and the reaction is usually not reversible.
In this case,burning of methane gas (CH₄) considered as chemical change.
Oxygen and methane are the reactants, while the new substance formed from the reaction are carbondioxide (CO₂) and water (H₂O) as ;
CH₄ + O₂ ---> CO₂ + H₂O
Hence, Chemical change occurs when methane gas is burned.
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7.0 mol Mn reacts with 5.0 mol
O2 according to the equation below:
2Mn+0₂ → 2MnO
How many moles of MnO form from7.0 mol Mn?
[?] mol MnO
Round your answer to the tenths place.
Answer:
= 7 moles Mno
Explanation:
We have been asked to determine the number of moles required to form MnO.
Mole ratio
Mn : MnO = 1 : 1
The reaction ratio therefore is 1 : 1
Thus 7 moles of Mn react to form 7 moles MnO since we have similar ratio.
Answer:
The answer that I got was 7.0.
Explanation:
It said round to the tenths place so put the .0 after the seven and see if that helps.
