Answer:
3,938.22
Explanation:
(correct me if I'm wrong)
How many grams of C3H8 are in a 7 L tank at 293 K and 5.45 atm?
What are the reactants in the reaction? What are their properties? Perform a quick Internet search, if needed.
The reactants in this reaction are sodium and chlorine. Sodium is a soft, silvery-white metal that is highly reactive. Chlorine is a poisonous greenish-yellow gas that has an odor and combines readily with other elements.
This might be the exact question so you might wanna rephrase it but good luck! :)))
A reactant is a substance that undergoes change during a chemical reaction.
A reaction in a chemical experiment is which takes place when there are mixtures between two or more reactants.
There are about four types of reactions which are:
SynthesisDecompositionSingle replacementDouble replacementPlease note that your question is not complete, therefore, i would give you a general overview to help you.
Some examples of reactants include:
HydrogenSodiumChlorine, etcRead more here:
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Lava that cools quickly forms: A. basalt B. granite C.quartz D. none the above
Answer:
I think the answer would be B. hope this helps!!
Explanation:
4. When the mole fraction of solute is 1, there is
(a) a 1:1 ratio of solute to solvent.
(b) no solute present.
(c) only solute present.
(d) only solvent present.
(e) 1 mole of solute and 99 moles of solvent.
Answer:
(c) only solute present
Explanation:
In chemistry, the mole fraction, denoted by X, refers to the number of moles of a substance in a compound/mixture divided by the total number of substances in the same compound or mixture.
In this case, we can say that mole fraction represents the number of solutes to the number of solutes and solvent in the solution i.e. X = nA/nA + nB
Where; nA = number of solutes
nB = number of solvent
X = mole fraction.
Based on this analogy, When the mole fraction of solute is 1, there is only solute present. That is; X = 1 / 1 + 0
X = 1/1 = 1.
“Copper pots are the best pots for cooking food quickly.” Which term best describes this statement?
Answer:
because I make eggs and they taste delicious
Answer:
Conclusion
Explanation:
_____ are factors that are not tested and remain constant. A. Dependent variables B. Controlled variables C. Independent variables D. Constant variables
Answer:
B. Controlled variables
Explanation:
The Dependent sample t-test compares the mean score of measurements in one group to that of another other group. It mainly used when analyzing comparable sample units as it pairs repeatable observations within a time frame.
Controlled variables are factors that are not tested and remain constant. Some examples of controlled variables are temperature, pressure, volume etc
What coefficient will balance the equation that is shown?
Al +_ HCI-H2 + ALCI,
Balanced equation :
2Al +6HCI⇒ 3H₂ + 2AlCI₃
Further explanationGiven
Reaction (unbalanced)
Al +HCI⇒ H₂ + ALCI₃
Required
Balanced equation
Solution
Give a coefficient
aAl +bHCI⇒ cH₂ + AlCI₃
Al, left = a, right=1⇒a= 1
Cl, left = b, right=3⇒b=3
H, left = b, right=2c⇒b=2c⇒3=2c⇒c=3/2
The equation becomes :
Al +3HCI⇒ 3/2H₂ + AlCI₃ x 2
2Al +6HCI⇒ 3H₂ + 2AlCI₃
Determine the empirical formula for a compound with 68.4% Cr and 31.6% O. Show your work in the space below.
Answer:
Cr2O3
Explanation:
To find the empirical formula, which is the smallest whole number ratio of a compound, the following is done:
68.4% Cr = 68.4g of Chromium
31.6% O = 31.6g of Oxygen
Since, Cr = 52, O = 16, divide each mass by their respective atomic mass to convert to moles.
Cr = 68.4/52 = 1.315 mol
O = 31.6/16 = 1.975 mol
- Next, we divide each mole value by the smallest value (1.315mol)
Cr = 1.315/1.315 = 1
O = 1.975/1.315 = 1.50
The ratio or Cr to O is 1:1.5
We multiply this ratio by 2 to get the whole number ratio as follows:
2 × 1: 2 × 1.5
2:3
Hence, the empirical formula of Cr and oxygen is Cr2O3.
What is the volume of 0.128 mol of nitrogen dioxide gas at STP?
A) 0.00571 L
B) 2.87 L
C) 5.89 L
D) 132 L
Answer:
B) 2.87 L
Explanation:
A mole of any gas at STP has a volume of about 22.412 liters. So, 0.128 moles of gas will have a volume of ...
0.128 · 22.412 L ≈ 2.87 L
Answer:
B. 2.87 LExplanation:
the volume of 0.138 mol of nitrogen dioxide gas at STP is equal to...2.87 L/litreA 1,600-milliliter bucket of paint is at a temperature of 70°F. Then the paint is divided equally into four smaller buckets. Each bucket is at 70°F before the paint is poured.
the temperature of each 400 milliliter bucket is about _____ the temperature of the original bucket of paint.
a.the same as
b.four times
c.one fourth
science
Answer:
a.the same as
Explanation:
The temperature of each 400mL bucket is about the same as the temperature of the original bucket of paint.
This is because the temperature of the paint inside the bucket is not dependent on the amount of paint present.
In this regard, the temperature is an intensive property. So each of the boxes will have a temperature that is the same as that of the original bucket. Each of the particles have the same amount of kinetic energy.Hydrogen bonds are in the family of Van der Waals forces. They are weaker than ionic and covalent bonds but they cause interesting changes with different chemicals.
What is one of the changes that hydrogen bonds are responsible for?
A. Cause DNA has the double helix shape.
B. Causes salts quickly dissolve in water.
C. Cause sugar looks like a crystal.
D. Cause liquid H2O to have a larger volume than frozen (solid) H2O
Answer:
The answer is B. Van der Waals forces are weaker than ionic and covalent bonds.
Explanation:
In general, if we arrange these molecular forces from the strongest to weakest, it would be like this:
Covalent bonds > Ionic bonds > Hydrogen bonds > Dipole-Dipole Interactions > Van der Waals forces
Covalent bonds are known to have the strongest and most stable bonds since they go deep and into the inter-molecular state. A diamond is an example of a compound with this characteristic bond.
Ionic bonds are the next strongest molecular bond following covalent bonds. This is due to the protons and electrons causing an electro-static force which results to the strong bonds. An example would be Sodium Chloride (NaCl), which when separated is Na⁺ and Cl⁻.
Van der Waals forces, also known as Dispersion forces, are the weakest type of molecular bonds. They are only formed through residual molecular attractions when molecules pass by each other. It doesn't even last long due to the uneven electron dispersion. It can be made stronger by adding more electrons in the molecule. This kind of molecular bonds appear in non-polar molecules such as carbon dioxide.
HOPE THIS HELPS!!!!!!!!!!!!!!
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The change that Hydrogen Bonds are most likely responsible for would be:
B). Causes salts to quickly dissolve in water.
As per the details provided, the hydrogen bonds are classified into the category of Van der Waals forces and the primary reason behind this has been that it leads salt to solvate immediately in the water. Amongst all the bonds, covalent bonds are characterized as the toughest while ionic bonds and hydrogen bonds are followed by it in terms of strength.The reason for which hydrogen bonds cause the change of allowing salts to dissolve immediately is that it illustrates a weaker strength of molecules due to its formation with residual uneven construction.Thus, option B is the correct answer.
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chemistry question help please
Answer:
xii. B. Smelting
xiii. D. Carbon
Explanation:
Smelting is known to be a process by which a metal is gotten. It is gotten either as the element or as a simple compound. This is obtained from metal's ore by heating. The heating can be done ordinarily in the presence of oxidizing agents, like air, or reducing agents, carbon e.g coke.
Zinc is gotten after Zinc oxide is heated in the presence of carbon.
This process is smelting.
Concentrated tetraoxosulphate acid is a strong dehydrating agent. It has the ability to char wood, paper, or sugar, leaving a carbonaceous residue. The charring effect is as a result of the carbon that is found in the wood.
The acid sucks in the oxygen and hydrogen, leaving behind the carbon; this results in the charring effect.
Which part of the mouth carries out each function? breaks down carbohydrates into sugars: cuts up food into smaller pieces:
Answer:
Saliva and teeth in this order
Explanation:
Make me BRANLIEST please
Which element has the largest atom (longest atomic radius) and which element has the smallest atom (shortest atomic radius)?
Answer:
Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.
An analog and a digital version of an audio signal were copied.
Analog wave
Digital wave
Original
Original
wmin TAILLAMOUNTAIN
Varan TO
Copy
Copy
Which conclusion is supported by the results shown in the table?
A. Digital waves can be copied without damaging the audio signal,
whereas analog waves cannot
B. Both digital and analog waves become damaged during the
copying process
C. Analog waves can be copied without damaging the audio signal,
whereas digital waves cannot
D. Noise is introduced when both digital and analog waves are
copied
Answer:
The answer is A.Digital waves can be copied without damaging the audio signal, whereas analog waves cannot
Explanation:
I took AP EX quiz.
What do the red arrows represent
Answer:
There are three forces acting on the skateboard. One of these forces is the weight of the rider. Another is the force of gravity on the board itself. The third is the force of the ground pushing up on the skateboard.
How many formula units are in 2.58 moles of Caci.?
Answer:
1.55 x 10²⁴ formula units
Explanation:
Given parameters:
Number of moles of CaCl₂ = 2.58moles
Unknown:
Formula units in the compound = ?
Solution:
To solve this problem, we must understand that;
1 mole of a substance contains 6.02 x 10²³ formula units
2.58 moles will contain 2.58 x 6.02 x 10²³ formula units
= 1.55 x 10²⁴ formula units
How many atoms of oxygen are in 566 g of glucose? * How many molecules are there in 43 grams of sodium hydroxide? * How many atoms of fluorine are in 5.5 x 10^24 molecules of sulfur hexafluoride? *
Answer:
See explanation
Explanation:
Number of moles of glucose in 566g = 566g/180g/mol = 3.14 moles
Number of moles of oxygen atoms in 1 mole of glucose= 6 * 16g/16g/mol = 6 moles.
There are 6 moles of oxygen in 1 mole of glucose
x moles of oxygen is therefore present in 3.14 moles of glucose
x = 6 * 3.14/ 1 = 18.84 moles of oxygen
1 mole of oxygen contains 6.02 * 10^23 atoms of oxygen
18.84 moles of oxygen contains 18.84 * 6.02 * 10^23 atoms = 1.14 * 10^25 atoms of oxygen.
Number of moles of sodium hydroxide in 43g of NaOH = 43g/40g/mol = 1.075 moles
1 mole of NaOH contains 6.02 * 10^23 molecules of NaOH
1.075 moles of NaOH contains 1.075 moles * 6.02 * 10^23 molecules / 1 mole of NaOH = 6.47 * 10^23 molecules of NaOH
Number of moles of atoms fluorine in SF6 = 6 * 19 g/19 g/mol = 6 mole of F atoms
1 mole of SF6 contains 6.02 * 10^23 molecules of SF6
x moles of SF6 contains 5.5 x 10^24 molecules of SF6
X = 5.5 x 10^24 molecules * 1/ 6.02 * 10^23 molecules
X = 9 moles of SF6
If 1 mole of SF6 contains 6 atoms of F
9 moles of SF6 will contain 9 * 6/1 = 54 atoms of F
How many carbon atoms are represented by the model below?
Answer:
3
Explanation:
what is the empirical formula 63.0 g Rb and 5.90 g O.
Answer:
Explanation:
1st convert given data into % per 100wt...
Total system mass = 63.0g + 5.90g = 68.9g
%Rb = 63.0g/68.9g x 100% = 91.4% per 100wt
%O = 5.9g / 68.9g x 100% = 8.6%
Then follow the following sequence of calculations...
% => grams => moles => mole ratio => reduce to smallest whole no ratio => empirical ratio => empirical formula
%Rb = 91.4% => 91.4g/ 85.5g·mol⁻¹ =>1.069mole
%O = 8.6% => 8.6g/16g·mol⁻¹ => 0.5375mole
Rb:O => 1.069 : 0.5375
Reduce by dividing by the smaller mole value
1.069/0.5375 : 0.5375/0.5375 => 2 : 1 <=> empirical ratio
∴ Empirical Formula => Rb₂O
Can someone help me please :)
What happens when the compound Mgo is formed? (5 points)
Oxygen transfers two electrons to magnesium.
Oxygen receives two electrons from magnesium.
Magnesium forms an ion with -1 charge; oxygen forms an ion with +1 charge.
Magnesium forms an ion with +1 charge; oxygen forms an ion with -1 charge.
Answer:
Oxygen receives two electrons from magnesium.
Explanation:
Hello!
In this case, considering the chemical reaction by which magnesium oxide is produced:
[tex]2Mg+O_2\rightarrow 2MgO[/tex]
In that case, if we show up the oxidation states, we have:
[tex]2Mg^0+O_2\rightarrow 2Mg^{2+}O^{2-}[/tex]
In such a way, since metals, like magnesium, have the capacity to lose electrons, rather than receive them, we infer why it turns out with +2 rather than -2; thus, we the correct answer is "oxygen receives two electrons from magnesium." because it results with -2 in MgO.
Best regards!
Answer:
Oxygen receives two electrons from magnesium.
Explanation:
Write a chemical equation of Dr. Jeff's demonstration using a battery to light steel wool on fire. The battery is used to allow a current to travel through the steel wool, thus heating it. Steel wood is made from iron (Fe).
Answer:
2Fe(s) + 3O2(g) --------> 2FeO3(s)
Explanation:
According to the question, a battery was used to light the steel wool by bringing the terminals very close together. When the battery came into contact with the steel wool, current was sent out through the thin wire. This caused the iron to heat up quite well.
Iron reacts with oxygen under these conditions as follows;
2Fe(s) + 3O2(g) --------> 2FeO3(s)
This is the chemical reaction that occurs when the steel wool is set on fire.
Chemical equation involved in Dr. Jeff's demonstration is
2 Fe+3 O₂[tex]\rightarrow[/tex]2 FeO₃
What is the effect of heating in chemical reactions?Battery is a device which helps in conduction of current. When a battery is used to pass a current through a substance in this case which is steel wool made up of iron it starts getting heated up.
The amount by which substance gets heated up is directly proportional to the current passing through it. As more current is passed through the battery it gets heated more.
During heating, the iron present in the steel wool reacts with oxygen to form iron oxide with iron present in the+3 oxidation state.When the heat exceeds a certain point the steel wool catches fire due to the heat generated. The heat causes the electrons present in steel wool of iron to move faster and collide with each other thus generating more heat.
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Can compounds be broken down into the elements they are made of?
Answer:
yes, some can
Explanation:
because like salt an other compounds by being decomposed
Complete the graphic organizer.
Basic Parts of an Atom
Answer:
I'm not sure but I think the answer is electrons, protons and neutrons.
Thomas calculates the volume of an object by multiplying the measurements 1.74 cm x 2.3 cm x 3.09 cm. Using significant figures, how should the answer be reported?
Answer:
12 cm³
Explanation:
Always round to the place of the number with the least amount of significant figures.
1.74 and 3.09 have three significant figures. 2.3 has two significant figures. Therefore, the answer will be rounded to two significant figures.
1.74 cm × 2.3 cm × 3.09 cm = 12.36618 -> 12 cm³
(The 3 in the tenths place is less than 5 so drop it and all the numbers to the right of it.)
Hope that helps.
1. Which of the following is the amount of space that an object takes up?
1. density
2. volume
3. mass
Answer:
2. volume
Explanation:
Answer:
volume
Explanation:
Give the symbol for the element with the following orbital diagram:
↑↓
1s
0000
↑↓
2s
0000
↑↓
↑↓
2p
↑↓
0000
↑↓
3s
0000
↑↓
↑↓
3p
↑↓
0000
↑↓
4s
0000
↑↓
↑↓
↑↓
3d
↑↓
↑
The given orbital diagram are iron and symbol for the element is Fe
Orbital diagrams are a pictorial description of electrons in an atom and where electron go in atom then we have to follow three rules, and the first one being the Auf bau Principle, the Auf bau Principle states that each electron occupies the lowest energy orbital first filled and the second is pauli exclusion principle in which only two electron are present which is in opposite spin and third is hunds rule of maximum multiplicity in which pairing of electron is not possible until orbital are singly occupied this rules are used for filling the electron here given orbital diagram in which 1s²2s²2p⁶3s²3p⁶4s²3d⁶ means the element is iron and symbol of this element is Fe
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The first mass extinction that occurred between the Paleozoic and the Mesozoic Era,
caused the extinction of which organism?
O Wooly mammoth
O Dinosaurs
O Trilobites
Flying Reptiles
Answer:
O Trilobites
Explanation:
The first mass extinction that occurred between the Paleozoic and the Mesozoic era caused the extinction of the trilobites.
Extinction are catastrophic events that causes the loss of organisms on the earth surface. Several factors can lead to extinction.
The first mass extinction took place between the Paleozoic and the Mesozoic era. This wiped out one of the most successful organism on the earth surface at that time. They were the trilobites.Bohr's model of the atom attempts to explain the idea that:
A) protons and neutrons are found in the nucleus
B) all atoms of one type of element are identical
C) energy is quantized
D) the atom is mostly empty space
It attempts to explain the idea that:C. energy is quantized
