A chemical reaction of exothermic kind releases energy in the form of heat and light.
We are given that reactant releases 27.4kJ/g for every gram of reactant consumed.
We are required to find number of grams of reactant that has been consumed
It is also given that 880J of energy is released
Hence, grams of reactants consumed is 880/27.4gm
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A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is 90.0 mL. The liquid solvent has a mass of 47.3 g and a density of 0.865 g/mL. Determine the mass of the solid given its density is 3.25 g/mL.
The mass of the solid will be 114.7 g.
Density problemThe density of a substance is given as the ratio of its mass and its volume.
Also, a solid will always displace its own volume in a liquid.
Mass of liquid solvent = 47.3 g
Density of liquid solvent = 0.865 g/mL
Recall that: density = mass/volume
Volume of liquid solvent = mass/density
= 47.3/0.865
= 54.7 mL
Volume of solid + liquid solvent = 90.0 mL
Volume of solid = 90.0 - volume of liquid solvent
= 90.0 - 54.7
= 35.3 mL
Density of solid = 3.25 g/mL
Mass of solid = density x volume
= 3.25 x 35.3
= 114.7 g
The mass of the solid is 114.7 g.
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Convert 0.00200 g into Mg and answer in scientific notation:
Answer: [tex]2.00x10^{2}[/tex]
Explanation: 1 gram is equal to 1000 Milligrams so
[tex]0.00200g=\frac{1000mg}{1g}[/tex]
Since you go straight across its just multiplication so 0.00200x1000=200mg
To answer it in scientific notation it should just be [tex]2.00x10^{2}[/tex] mg
Solve the following problem:
How many seconds are in 3 years?
Please show your work. You will need to include the following conversion factors:
• 365 days/1 yr or 1 yr/365 days
1 day/24 hours or 24 hours/1 day
.60 min/1 hour or 1 hour/60 min
. 1 min/60 sec or 60 sec/1 min
Answer: 94,608,000 seconds
Explanation:
365 days/1 yr=365
24 hours/1 day=24
60 min/1 hour=60
60 sec/1 min=60
365*24*60*60=
8760*3600=31536000 seconds in 1 year.
31536000*3=94608000 seconds
It cost $35.57 to drive the school bus for 94.00 miles.
Given:
Distance to drive (D) = 94.00 miles
Miles per gallon (MPG) = 6.500 miles/gallon
Cost of gas (C) = $2.459/gallon
Step 1: Calculate the amount of gas required for the trip.
Gas consumed = Distance / Miles per gallon
= 94.00 miles / 6.500 miles/gallon
= 14.4615 gallons
Step 2: Calculate the cost of gas for the trip.
Cost of gas = Gas consumed * Cost per gallon
= 14.4615 gallons * $2.459/gallon
= $35.57
Therefore, it will cost $35.57.
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Can you please help me
Answer: false
Explanation: A model is a representation of a more complex system
how many moles of CaCo3 are there in an antacid tablet containing 0.512g CaCo3
The number of mole of CaCO₃ in antacid tablet containing 0.512 g of CaCO₃ is 5.12×10⁻³ mole
Description of moleThe mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
How to determine the mole of CaCO₃From the question given above, the following data were obtained:
Mass of CaCO₃ = 0.512 gMolar mass of CaCO₃ = 40 + 12 + (3 × 16) = 40 + 12 + 48 = 100 g/mol Mole of CaCO₃ =?The number of mole in 0.512 g of CaCO₃ can be obtained as follow:
Mole = mass / molar mass
Mole of CaCO₃ = 0.512 / 100
Mole of CaCO₃ = 5.12×10⁻³ mole
Thus, 5.12×10⁻³ mole of CaCO₃ is present in the antacid tablet
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A chemist records the amount of liquid dispensed by a machine and obtains the following values: 283.2 mL, 284.1 mL, 283.9 mL, 284.0 mL, 284.1 mL. The machine is supposed to dispense 296 mL of liquid. Which of the following describes the accuracy and precision of the machine?
precise but not accurate
accurate but not precise
neither accurate nor precise
accurate and precise
The machine is accurate and precise
Hence , option D is correct one .
Accuracy is the capacity of an instrument to measure the precise value. In other words, it refers to how closely the measured value resembles a reference or genuine value. Small readings can be taken to increase accuracy. The calculation's inaccuracy is decreased by the little reading.
The precision of a substance is defined as the degree to which two or more measurements agree with one another. It is incredibly precise but not always accurate to measure something if you weigh it five times and get 3.2 kg each time. Accuracy is not necessary for precision.
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who said electrons move around the nucleus billions of times in one second
Answer:
it's Heisenberg Einstein
Explanation:
Heisenberg Einstein & other scientists
Electrons move around the nucleus billions of times in one second. There are small, negatively charged particles inside an atom called electrons. “Atomos” means “not to be cut,” which refers to the smallest piece of matter.
Answer:
Heisenberg Einstein
Explanation:
they where the main one but there where a few others who agreed
what distance in miles can you drive in your new Prius hybrid, if your car gets 56 miles per gallon and you have 15.5 gallons of gas?
Taking into account the rule of three, you can drive your new Prius hybrid a distance of 868 miles.
Rule of threeRule 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.
If the relationship between the magnitudes is direct, the direct rule of three must be applied as follow, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: x= (c×b) ÷a
Distance in miles in this caseIn this case, you can apply the following rule of three: If the car for 1 gallon of gasoline gets 56 miles, for 15.5 gallons of gasoline it gets how many miles?
1 gallon ⇒ 56 miles
15.5 gallons ⇒ x
So: x= (15.5 gallons ×56 miles) ÷1 gallon
Solving:
x= 868 miles
In summary, you can drive your new Prius hybrid a distance of 868 miles.
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convert 1295 cm2 to m2
Answer:
0.1295 m^2
Explanation:
just divide 1295 by 10000
Maalox is the trade name for an antacid and antigas medication used for relief of heartburn, bloating, and acid indigestion. Each 4−mL portion of Maalox contains 320 mg of aluminum hydroxide, 320 mg of magnesium hydroxide, and 32 mg of simethicone. If the recommended dose is two teaspoons four times a day, how many grams of each substance would an individual take in a 12−hour period. (1 teaspoon = 5 mL.)
Maalox is the trade name for an antacid and antigas medication used for relief of heartburn, bloating, and acid indigestion in which
4 ml contains
= 320mg of aluminum hydroxide
= 320mg of magnesium hydroxide
= 32mg of simethicone
recommended doses = 4 times * 2 tea spoon = 8 tea spoon/ day
given = 1 tea spoon = 5 ml
8 tea spoon = 40 ml
hence,
amount of aluminum hydroxide = 320/4 * 40 = 3200mg = 3.2 g
amount of magnesium hydroxide = 320/4 * 40 = 3.2 g
amount of simethicone = 32/4 * 40 = 320 mg = 0.32g
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HELPPP
Ferric chloride combines with water in a reversible reaction to produce ferric hydroxide and hydrochloric acid as shown.
FeCl3 + 3H₂0 Fe(OH)3 + 3HCI
Which reaction must occur at the same time as the formation of ferric hydroxide?
(1 point)
O Fe(OH)3 + 3HCI → FeCl3 + 3H₂O
O FeCl3 + 3HCI → Fe(OH)3 +3H₂O
O FeCl3 Fe + 3Cl
O 2H₂O → H₂ + O₂
The reaction that will occur at the same time as the formation of ferric hydroxide will be [tex]Fe(OH)_3 + 3HCI --- > FeCl_3 + 3H_2O[/tex].
What is a reversible reaction?A reversible reaction is a reaction that proceeds both forward and backward at the same time.
In other words, it is a reaction in which as the reactants react to form products, the products simultaneously react to form reactants.
Thus, looking at the original forward reaction:
[tex]FeCl_3 + 3H_2O --- > Fe(OH)_3 + 3HCI[/tex]
Ferric chloride reacts with water to form ferric hydroxide and hydrochloric acid. Since the reaction is reversible, the ferric hydroxide and hydrochloric acid formed will simultaneously be reacting to form the reactants.
In other words, the reaction that will occur at the same time as the formation of ferric hydroxide will be:
[tex]Fe(OH)_3 + 3HCI --- > FeCl_3 + 3H_2O[/tex]
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This is science not Chemistry
In the following illustration what do you call location (a) and location (b)?
Answer:
you can do it shshbssjjsjsnsjssbsjsb
The same type of engine is placed in two different airplanes. The first airplane is twice as heavy as the second airplane
Which statement is correct about the mass of the airplane and its acceleration, assuming a constant net force? (1 point)
O Increasing the acceleration of the airplane causes the engine to provide more force.
O Decreasing the mass of the airplane will result in the airplane accelerating less.
O Increasing the acceleration of the airplane causes the engine to provide less force.
O Decreasing the mass of the airplane will result in the airplane accelerating more.
If the engines in both airplanes are at the same weight, the engines in both airplanes would still have the same mass because mass is constant everywhere.
What is mass?Mass can be experimentally defined as a measure of the body's inertia, meaning the resistance to acceleration (change of velocity) when a net force is applied.
In the question, the same type of engine is placed in two different air-planes of which the first airplane is twice as heavy as the second.
We can then conclude that the correct statement about the mass of the airplane and its acceleration, assuming a constant net force is that Increasing the acceleration of the air-plane causes the engine to provide more force.
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Name the material sent into slave by a supernova
D) Chemical, Reactivity
Physical or Chemical Change? Why? Iron reacts with Sulphur to give heat and a flame.
(A) Chemical, Smell/Taste
B) Chemical, Color/Sight
c) Chemical, Combustibility/Reaction
D) Physical, Color
c) Chemical, Combustibility/Reaction Iron reacts with Sulphur to give heat and a flame.
What happens when you heat iron and sulphur together?Iron sulphide, a chemical, is created when you burn iron and sulphur together. A series of chemical compounds comprised of iron and sulphur is referred to as iron sulphide, or simply iron sulphide. The chemical molecule and mineral known as iron sulphide, sometimes known as iron(II) sulphide, has the formula FeS.
Incandescence is the process of a solid emitting light after being heated till it glows or emits light. The colour of an iron bar when warmed to a very great temperature changes from red to white as the temperature increases.
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A student is given a metal block and told to calculate the density of the object. The student measures the block on each side (LxWxH) 4 times each.
He then calculates the average measurement for each side. Those average values are:
Average Length = 6.51 cm
Average Width = 4.34 cm
Average Height = 7.17 cm
Calculate the volume of the block
to be rounded to the nearest supported value)
cm^3 (Select the answer closest to what you calculated. Significant Figures requires all answer
The volume of the metal block is 201 [tex]cm^3[/tex]
What is average volume?The volume of an object is the multiplication of all the sides of the object.
The average volume, on the other hand, is the multiplication of the average sides of objects.
In this case, the object has length, width, and height.
Average length = 6.51 cm
Average width = 4.34 cm
Average height = 7.17 cm
Volume of the metal block = 6.51 x 4.34 x 7.13
= 201 [tex]cm^3[/tex]
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Rather than saying the electrons transition
between energy levels to produce the colors in fireworks, how might
mechanical model? What does this tell you about the energies of the
you refine this description using your new knowledge of the quantum
orbitals?
When the electrons get excited it move from lower level to higher energy level and gain energy but when electrons pumped back to there lower energy level the excess energy get emitted as light.
What is electron transition?Electron transition can be defined as when an atoms or molecules absorbs radiation there electron get excited and jump from lower energy level to higher energy level and when an atom or molecule emit radiations energy it come back to its original place i.e. to the lower energy state.
Electron transition is based on Franck-Codon principle.
According to this principle electron transition occur without changes in position of there nuclei in the molecular entity and its environment.
Thus, when the electrons get excited it move from lower level to higher energy level and gain energy but when electrons pumped back to there lower energy level the excess energy get emitted as light.
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Questions
Q1.
Use the Periodic Table on page 2 to help you answer this question.
Give the name or symbol of
(a) the element in group 3 and period 4.
Gallium is the element that belongs to the group 3 and the fourth period. Ga is symbol of Gallium.
The element gallium has an atomic number of 31.While highly pure gallium is covered in a dazzling silvery colour, solid gallium is a blue-grey metal with an orthorhombic crystalline structure.It is a crucial part of numerous semiconductors. Due to its capacity to transform power into light, it is additionally used in red LEDs (light emitting diodes).Because of its high boiling point, it is perfect for recording temperatures that would cause a thermometer to vaporise.From iron pyrites, zinc blende, germanite, and bauxite, this metal can be readily removed as a byproduct.Because gallium is a corrosive chemical, it can cause serious skin and eye burns asse well as significant irritation.Learn more about semiconductors here
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A 0.5 kilogram piece of aluminum increases its temperature 7 degrees C when heat energy is added. How much heat is produced this change in temperature
Answer: Heat energy (Q) added is 3150 (J) .
Explanation:
calculate denisty in grans per milliliter 25.0 mL having a mass of 19.7 g
How many moles of Ne are contained in a 5.00 L tank at 155°C and 2.80 atm?
There will be 0.39 moles
Take a look at the He gas in the tank:
P = 2.80 atm, or pressure
Volume = 5.00 liters.
T = (273 + 155) is the temperature. K = 428 K
R = 0.08206 L atm/L of gas (mol K)
Charle's law, Boyle's law, and Gay-Lussac law are the three gas laws that make up the combined gas law, commonly referred to as a general gas equation. For a certain amount of gas, the law illustrates the relationship between temperature, volume, and pressure.
Gas law PV = nRT
So, n = PV/. (RT)
He gasses number = 2.80 x 5.00 / (0.08206 x 428) mol equals 0.39 mol.
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A 0.100 g sample of a carboxylic acid is burned in oxygen, producing 0.178 g of CO2 and 0.0734 g of H2O. Determine the empirical formula of the carboxylic acid.
The empirical formula of the carboxylic acid is C₃H₆O₂.
For determination of the empirical formula of the carboxylic acid.
As you know, one mole of water, contains 2 moles of hydrogen. This means that the percent composition of hydrogen in water will be
2× 1.00794 g/mol / 18.015 g/mol × 100 = 11.19% H
What this means is that every 100 g of water will contain 11.19 g of hydrogen. In your case, the 0.2349-g sample of water will contain
0.2349 g water⋅ 11.19 g H / 100 g water = 0.026285 g H
Similarly, one mole of carbon dioxide, CO₂, contains one mole of carbon. The percent composition of carbon in carbon dioxide will be
1 ×12.011 g/mol / 44.01 g/mol × 100 = 27.29% C
Once again, this tells you that every 100 g of carbon dioxide will contain
27.29 g of carbon. In your case, you will have
0.5706g H₂O ⋅ 27.29 g C /100g H₂O = 0.15572 g C
The mass of carbon + hydrogen originally present in the carboxylic acid sample will be
m C + H = 0.026285 g + 0.15572 g =0.18201 g
The initial mass of the sample was equal to 0.3200 g. This tells you that the sample also contains oxygen
m oxygen = 0.3200 g −0.18201 g = 0.13799 g O
So, now that you know how many grams of each element were present in the initial sample, use their molar masses to convert these to moles
For C: 0.15572g /12.011g/mol = 0.012965 moles C
For H: 0.026285 g/1.00794g/mol = 0.026078 moles H
For O: 0.13799g/15.9994g/ mol = 0.0086247 moles O
Now, to get the compound's empirical formula, you need to find the smallest whole number ratio that exists between the number of moles of each element in the compound.
To do that, divide these values by the smallest one to get
For C: 0.012965 moles / 0.0086247 moles = 1.5032 ≈ 1.5
For H: 0.026078moles /0.0086247 moles =3.0236≈ 3
For O: 0.0086247moles /0.0086247 moles = 1
This means that you have
C₁.₅H₃O₁
Since you're looking for the smallest whole number ratio that exists between the elements, multiply each subscript by 2 to get
C₁.₅H₃O₁ * 2 = C₃H₆O₂
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PLS HELP ME WITH MY CHEMISTRY
Answer:
Explanation:density=mass×volume
so your answer will be 14.7×6.6=97.02
For any large collection of randomly selected chlorine atoms:
a. what is the average atomic mass of chlorine in amu?
An atomic mass unit is defined as 1/12 th of the mass of carbon-12 atom.
The mass of an atom is mainly due to its protons and neutrons in the nucleus.
Weight of a proton is 1.6 x 10^-27 kg
Weight of a neutron is 1.6 x 10^-27kg
However weight of an electron is 9 x 10^-31kg and hence is negligible in calculation of amu
A chlorine atom has 17 protons in its nucleus and 18 neutrons in its nucleus
Its atomic number is 17
Amu weight of Cl= weight of protons+ weight of neutrons
=17+18
=35amu
Hence the average atomic mass unit of chlorine atoms will be 35 amu
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The value is taken for easier calculation and is not accurate upto 3 decimals
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why is unauthorized modification of car is dangerous?
Answer:
It is dangerous because it can be harder to drive the car.
Explanation:
Any alterations in your car can void some of your warranties and may also pose some safety concerns. It is also illegal as well.
How do you draw this bond-line structure?
Why is isopropyl alcohol a pure substance?
Answer:
A substance is considered a chemically pure substance when it has a fixed chemical composition throughout, and uniform physical and chemical properties. Because isopropyl alcohol ( C3H8O ) Is a homogenous compound with constant physical and chemical properties, as well as a uniform chemical structure, isopropyl alcohol is definitely fit to be considered a pure substance.
A spherical iron ball has a
diameter of 11.6 cm and has a
mass of 3.60 kilograms. This
particular ball has a hole inside
of it. Given that the density of
iron metal is 7.86 g/cm*, what is
the volume in cm" of the hole
inside the ball? (The volume of
a sphere is (4/3) Tr3)
The volume of the hole inside the ball is 359.27 cubic inches if the spherical iron ball has a diameter of 11.6 cm and a mass of 3.60 kilograms.
What is a sphere?It is defined as three-dimensional geometry when half-circle two-dimensional geometry is revolved around the diameter of the sphere that will form.
[tex]\rm V = \dfrac{4}{3} \pi r^3[/tex]
The volume of the sphere V = (4/3)πr³
The diameter d = 11.6 cm
The radius r = 11.6/2 = 5.8 cm
The volume of the sphere V = (4/3)π(5.8)³
V = 817.28 cubic cm
As we know,
The density d = mass/volume
7.86 = 3600/volume
Volume = 458.01 cubic cm
The volume of the hole inside the ball = 817.28 - 458.01
= 359.27 cubic inches
Thus, the volume of the hole inside the ball is 359.27 cubic inches if the spherical iron ball has a diameter of 11.6 cm and a mass of 3.60 kilograms.
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How many moles are present in each of the following at STP?
A.54.5 dm3 CH4
B.250.0 cm3 CO
1. The number of mole of 54.5 dm³ of CH₄ at STP is 2.43 moles of CH₄
2. The number of mole of 250 cm³ of CO at STP is 0.01 mole
Volume of gas at STPAt standard temperature and pressure (STP),
1 mole of gas = 22.4 dm³ = 22400 cm³
1. How to determine the mole of 54.5 dm³ of CH₄At standard temperature and pressure (STP),
22.4 dm³ = 1 mole of CH₄
Therefore,
54.5 dm³ = (54.5 dm³ × 1 mole) / 22.4 dm³
54.5 dm³ = 2.43 moles of CH₄
2. How to determine the mole of 250 cm³ of COAt standard temperature and pressure STP,
22400 cm³ = 1 mole of CO
Therefore,
250 cm³ = (250 cm³ × 1 mole) / 22400 cm³
250 cm³ =0.01 mole of CO
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What is true of a molecule?
A. Each molecule of a compound has different properties.
B. Each atom of a molecule is the same
C. All molecules of a compund have the same properties.
D. All molecules of a compound have one type of atom
The true statement about a molecule is that all molecules of a compound have the same properties and is therefore denoted as option C.
What is an Atom?
This is referred to as the smallest unit of matter without the release of electrically charged particles which include proton, electron etc.
Atoms combine together to form molecules and they are involved in the formation of chemical compounds such as NaCl etc. It consists of identical molecules which means that all of them have the same properties which is therefore the reason why option C was chosen as the most appropriate choice.
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Answer:
All molecules of a compound have the same properties.
Explanation: