Answer:
0.3025 moles of CO₂ are produced
Explanation:
Reaction is: Na₂CO₃ (aq) + 2 HF (aq) → H₂O (l) + CO₂ (g) + 2 NaF (aq)
It is correctly ballanced.
If the given information stays that the excess amount is on the sodium carbonate, the HF is the limiting reagent.
We see that stoichiometry is 2:1. Moles of produced CO2, will be the half, than the original amount, we have.
Firste step: We convert the mass to moles
12.1 g . 1mol / 20g = 0.605 moles of HF
2 moles of HF can produce 1 mol of CO₂
0.605 moles of HF will produce (0.605 . 1) /2 = 0.3025 moles of CO₂
40 POINTS!!!
Listed in the Item Bank are key terms and expressions, each of which is associated
with one of the columns.
Choose the number associated with Extensive or Intensive
for each characteristic in the column. Order does not matter.
Extrinsic properties (also called extensive) are directly related to the amount of
material being measured.
Intrinsic properties (also called intensive) are those which are independent of the
amount of matter present.
Volume
Density
Mass
Temperature
Length
Melting Point
Color
Boiling Point
Luster
Answer:
ddddddfrvtrnsyjemn
Explanation:
dddddddddddd
look at the screenshot
Does C2H6O dissociate in an aqueous solution? How can you tell?
C2H6O is ethanol which is easily dissociate in aqueous solution because ethanol is easily soluble in water.
What is aqueous solutions?
Aqueous solution is defined as a solution in which the solvent is water.
Example of aqueous solution are cola, salt water, base solution, salt solution etc., are some of the example of aqueous solution.
Non aqueous solution is defined as a solution obtained by dissolving solute in any liquid other than water.
Example of non aqueous solutions are ethene in dichloromethane and Sulphur in carbon disulphide etc. are some of the example of non aqueous solution.
Thus, C2H6O is ethanol which is easily dissociate in aqueous solution because ethanol is easily soluble in water.
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What is the frequency of the wave shown below assuming it is light (electromagnetic radiation)?
4.17 x 107 m
The frequency of the wave assuming it is light having compete distance as 4.17×10^7 m is 1.44×10^15 Hz
Wavelength:- It is defined as the distance between the two Consecutive Crest or trough. OR distance travelled by the wave to Complete one Complete Cycle.
The distance for completing two cycle is 4.17×10^7 m
so 2λ=4.17×10^7m
λ=2.085×10^-7m
Also f=c/λ
f=3×10^8/2.085×10^-7
f=1.44×10^15 Hz
A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in the consecutive cycles is wavelength.The number of cycles or vibrations that a body in periodic motion experiences during one unit of time, as well as the number of waves that pass a given point in a unit of time is frequency.To learn more about frequency visit:
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2.4.5 x 10³ dm³ to m³
Answer:
The conversion factor is 0.001; so 1 cubic decimeter = 0.001 cubic meters. In other words, the value in dm3 divide by 1000 to get a value in m3.
Explanation:
the NCC Libraries
What atoms listed below would form a covalent bond with each other?
-F (fluorine) and K (potassium)
-C (carbon) and Cl (chlorine)
-Ag (silver) Cu (copper)
-Ag (silver) and Br (bromine)
-Na (sodium) and Mg (magnesium)
Answer: F,C,NA
Explanation:
bc it is
All of the following changes to a metal are physical changes except
A: polishing
B: bending
C: melting
D: rusting
An object weighs 15.50 grams the object was placed in water the initial volume of the water was 12.5ml and the final volume was 16.0ml after the object was placed inside what is the density of the object
The density of the object weighing 15.50 g when placed inside the water having initial volume 12.5 mL and the final volume 16.0 mL is 4.42 g/mL.
Density is defined as the mass of a substance per unit of its volume. It is denoted by a Greek symbol ρ. Density is the mass of a substance divided by its volume. It is given by -
ρ = m
v
where,
ρ = density
m = mass
v = volume
Given data :
Mass (m) = 15.50 g
Volume (v) = (Final volume - initial volume)
v = 16.0 mL - 12.5 mL = 3.5 mL
Putting the values in above formula,
Density = mass
volume
Density = 15.50 = 4.42 g/mL
3.5
The density of object is found to be 4.42 g/mL
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Direction: Solve the polarity of the following compounds by subtracting the electronegativity of the compounds. Determine their polarity and type of compound based on the answer.
1) CH2CI1
2) CH3OH
3) OF2
4) CCI4
5) BF3
Polarity is the distribution of electrical charge among the atoms connected by a chemical bond.
1. CH2CL- Carbon has an electronegativity of 2.5, hydrogen has a 2.2 electronegativity, and the chlorine atom has a 3.1 electronegativity. Their electronegativities differ by 0.3 for C-H and 0.6 for C-Cl. The fact that dichloromethane is a polar molecule is therefore confirmed.
2. CH3OH- The C-O bond has a difference in electronegativity of 3.44 - 2.55 = 0.89, which cannot be disregarded. The C-O bond is hence polar. The O-H bond is polar because the difference in electronegativity is 3.44 - 2.2 = 1.24.
3. OF2 - Two O-F covalent bonds can be found in OF2 O F 2. Oxygen has an electronegativity of 3.5. Fluorine has an electronegativity of 4.0. Therefore, there is a 0.5 discrepancy between the electronegativity values. Thus OF2 is polar.
4. CCl4 - Carbon tetrachloride (CCl4) is a non-polar molecule with µ=0
5. BF3 - It is more than 0.5 because the difference between the electronegativity values of B and F is equivalent to 1.94 (3.98 - 2.04 = 1.94). Therefore, each B-F bond in the molecule of boron trifluoride (BF3) is polar.
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Does a small standard deviation mean that the results of the experiment were successful?
True or False
Answer: Ture
Explanation: A small standard deviation means that the data is more clustered around the mean (More reliable).
Li+ has larger radius than Li true or false
Answer:
true I believe
Explanation:
A 10.4 g sample of CaSO4 is found to contain 3.06 g of Ca and 4.89 g of O. Find the mass of sulfur in a sample of CaSO4 with a mass of 65.8 g.
The mass of sulfur in a sample of CaSO4 with a mass of 65.8 g is 15.50g.
How to calculate mass of an element in a compound?According to this question, a 10.4 g sample of CaSO4 is found to contain 3.06 g of Ca and 4.89 g of O.
This means that the mass of sulfur in the 10.4g of CaSO4 is 10.4g - (3.06g + 4.89g) = 10.4g - 7.95g = 2.45g
Next, we calculate the percent ratio of each element in the compound; CaSO4.
Ca = 3.06g/10.4g × 100 = 29.42%S = 2.45g/10.4g × 100 = 23.56%O = 4.89g/10.4g × 100 = 47.02%According to this question, a sample of CaSO4 with a mass of 65.8 g is given. The mass of each element in this compound is as follows:
Ca = 29.42/100 × 65.8g = 19.36gS = 23.56/100 × 65.8g = 15.50gO = 47.02/100 × 65.8g = 30.94gTherefore, the mass of sulfur in a sample of CaSO4 with a mass of 65.8 g is 15.50g.
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a quarter made predominantly of silver (density=10.5 g/mL), was determined to have a mass of 6.25g. what is the volume of the quarter?
Taking into account the definition of density, the volume of the quarter is 0.5952 mL.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
Volume of the quarterIn this case, you know that:
Density= 10.5 g/mLMass= 6.25 gReplacing in the definition of density:
10.5 g/mL= 6.25 g÷ volume
Solving:
10.5 g/mL× volume= 6.25 g
volume= 6.25 g÷ 10.5 g/mL
volume= 0.5952 mL
In summary, the volume of the quarter is 0.5952 mL.
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Question 3 of 10
What is nuclear fission?
Answer:
Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei. The fission process often produces gamma photons, and releases a very large amount of energy even by the energetic standards of radioactive decay
How many atoms are in 1.50 moles of lithium, Li?
Answer:
1 LITHIUM= 6.022140857×1023 atoms
0.50 LITHIUM = 3.01 × 102^3
ADD THEM TOGETHER AND YOU GET YOUR ANSWER.
Explanation:
Ions are particles that have a different number of protons and ____. Ions are electrically charged. Ions can be formed when a metal reacts with a Non-metal. Metal atoms ____ electrons to form ____ ions. Non metals ____ electrons to form _____ions.
Ions are simply referred to as electrically charged atoms. Ions are formed when atoms lose or gain electrons to become positively or negatively charged.
Positively charged atoms are called cations (+) while negatively charged atoms are called anions (-).
According to this question, ions are electrically charged that can be formed when a metal reacts with a non-metal.
Metals like calcium, pottasium etc. lose electrons to form positive ions or cations while non-metals such as nitrogen, oxygen etc gain electrons to form negative ions or anions.
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50 points
Which elemental family receives electrons in an ionic bond?
Responses
noble gases
metals
halogens
nonmetals
Answer: es no metales
Explanation:
Rounding off 0.072251 to four significant figures
0.072251
Explanation:
The Sig Figs would be 5 (0.072251)
In Decimals 6 (0.072251)
Scientific Notation 7.2251 × 10-2
E-Notation 7.2251e-2
Question Completion Status:
PUESTIVITY
Refer to Activity 2 in Lab 3A to answer the question below
Two amino acids are shown below in the process of forming a peptide bond (labeled). The hydroxyl (-OH circled in red) is being removed from the carboxyl group of the first amino acid. A hydrogen
atom (-H circled in red) is being removed from the amine group from the second amino acid. The removed -OH and -H will form water (H20)
Question
What chemical reaction takes place when water is removed to form a bond (as is being shown below)?
Explanation:
Refer to Activity 2 in Lab 3A to answer the question below
Two amino acids are shown below in the process of forming a peptide bond (labeled). The hydroxyl (-OH circled in red) is being removed from the carboxyl group of the first amino acid. A hydrogen
atom (-H circled in red) is being removed from the amine group from the second amino acid. The removed -OH and -H will form water (H20)
Question
What chemical reaction takes place when water is removed to form a bond (as is being shown below)?
A 1.0 mole sample of fluorine gas at 25 °C has an average molecular velocity of 415 m/s. What is the total KE of the gas sample? Report your answer in kilojoules to the nearest tenth.
The total kinetic energy of the gas sample is 3.3 KJ
What is kinetic energy?This is the energy possessed by an object in motion. Mathematically, it can be expressed as:
KE = ½mv²
Where
KE is the kinetic energy m is the mass v is the velocity How to determine the mass of the fluorine gasMolar mass of fluorine gas = 38 g/molMole of fluorine gas = 1 moleMass of fluorine gas = ?Mass = mole × molar mass
Mass of fluorine gas = 1 × 38
Mass of fluorine gas = 38 g
How to determine the KE of the gas sampleMass (m) = 38 g = 38 / 1000 = 0.038 KgVelocity (v) = 415 m/sKinetic energy (KE) =?KE = ½mv²
KE = ½ × 0.038 × 415²
KE = 3272.275 J
Divide by 1000 to express in kilojoule
KE = 3272.275 / 1000
KE = 3.3 KJ
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You carefully weigh out 15.00 g of CaCO3 powder and add it to 60.75 g of HCl solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 69.60 g . The relevant equation is
CaCO3(s)+2HCl(aq)→H2O(l)+CO2(g)+CaCl2(aq)
Assuming no other reactions take place, what mass of CO2 was produced in this reaction?
According to the law of conservation of mass, the mass of CO₂ formed is 6.15 g.
What mass of Carbon dioxide, CO₂ is produced from the given reaction between 15.00 g of CaCO3 powder and add it to 60.75 g of HCl solution?The mass of Carbon dioxide, CO₂ is produced from the given reaction between 15.00 g of CaCO3 powder and add it to 60.75 g of HCl solution is determined as follows:
The mass of the calcium carbonate, CaCO₃ reacting = 15.0 g
Mass of HCl solution reacting = 60.75 g
Total mass of reactants = 60.75 g + 15.0 g
Total mass of reactants = 75.75 g
On addition of the calcium carbonate to the HCl solution, bubbles of carbon dioxide gas, CO₂, were observed and the gas allowed to escape.
Equation of the reaction: CaCO₃ (s) + 2 HCl (aq) → CaCl₂ (aq) + H₂O (l) + CO₂ (g)
Mass of resulting solution = 69.60 g
According to the law of conservation of mass, mass of product = mass of reactant
Therefore, mass of CO₂ formed = 75.75 g - 69.60 g
mass of CO₂ formed = 6.15 g
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A chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 4.1 mL. If the metal weighs 4.5 g, what is the density of the metal in g / m * L ?
Taking into account the definition of density, the density of the metal is 1.097 g/mL.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is:
density= mass÷ volume
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Density in this caseIn this case, you know that:
Mass= 4.5 gVolume= 4.1 mLReplacing in the definition of density:
density= 4.5 g÷ 4.1 mL
Solving:
density= 1.097 g/mL
In summary, the density of the metal is 1.097 g/mL.
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The image compares the arrangement of electrons in two different neutral atoms.
A shaded sphere is shown at the center of four concentric circles. The innermost circle has two black spheres. The middle circle has eight black spheres. The outermost circle has one black sphere. To the right of this figure labeled Atom D is another figure labeled Atom E. Atom E has a shaded sphere at the center of four concentric circles. The innermost circle has two black spheres. The second and the third circles have eight black spheres each. The outermost circle has one black sphere.
Which of the following best explains the position of the two atoms in the periodic table?
a
Both atoms have an estimated Zeff of 1; therefore, Atom D is to the right of Atom E in the same period.
b
Both atoms have Zeff of 1; therefore, Atom D is above Atom E in the same column because of the additional energy level.
c
Atom D has an estimated Zeff of 1 and is therefore to the left of Atom E, which has a Zeff of 9.
d
Atom D has an estimated Zeff of 1 and is therefore below Atom E in the same column, which has a Zeff of 9.
The correct answer is option b) Both atoms have Zeff of 1; therefore, Atom D is above Atom E in the same column because of the additional energy level.
The term "Zeff" refers to the effective nuclear charge, which is equal to the atomic number (number of protons) less the core electrons (all the electrons less the valence electrons).
Zeff = no. of protons - no. of core electrons
Now, each circle in the image indicates a distinct energy level, with rising energy as one moves away from the nucleus. Since atom D has fewer energy levels than atom E, hence, it is placed above atom E in the periodic table.
Furthermore, according to the trends of the periodic table, atoms with the same number of valence electrons will be in the same column. Since atoms D and E both have a single valence electron. Hence, they are in the same column and have the same Zeff of 1.
Therefore, both atoms have Zeff values of 1, and Atom D is positioned above Atom E in the same column due to the additional energy level in atom E.
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Which statements are true about balancing chemical equations?
Check all that apply.
A. Balancing chemical equations does not involve trial and error.
B. Balancing chemical equations involves trial and error.
C. Atoms that are in only one of the reactants and only one of the
products should be done last.
D. Single atoms should be done last.
Answer:
statement C is the correct answer
the length of a soccer field; 120. m (three significant figures), to inches
given the following equivalences:
1 in 2.54 cm
=
1 ft = 12 in
When we convert 120 meter to feet we obtain 393.6 feet.
How do you convert from meter to feet?Unit conversions is very important in science. It is important that we are able to express a value in different units as this is able to ease the process of making calculations.
We know that;
1 meter = 3.28 foot
120 meter = 120 meter * 3.28 foot/1 meter
= 393.6 feet
Thus, when we convert 120 meter to feet we obtain 393.6 feet.
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some scientific tools are used for making observations,and others are used for making measurements. whivh of these tools would be most useful for observing the behavior of ants? is it A.hands lens. b.metric ruler. C.electronic balance D.graduated cylinder,And explain .
What is the numerical value of 1.2 × 1.222? Express your answer using the correct number of significant figures.
Using simple multiplication, we can conclude that 1.5 is the numerical value of 1.2 × 1.222.
What is numerical ?When solving mathematical analysis issues, numerical analysis is the study of methods that employ numerical approximation rather than symbolic manipulation (as distinguished from discrete mathematics). The study of numerical techniques aims to identify approximate rather than precise answers to issues.
Numerous engineering and physical science disciplines, as well as the life and social sciences, as well as commerce, the arts, and even medicine, use numerical analysis.
The use of more complex numerical analysis is now possible thanks to the rise in computing power, which also enables the creation of intricate and accurate mathematical models for use in engineering and science. Ordinary differential equations, which are used in celestial mechanics to forecast the motion of planets, stars, and galaxies, are examples of numerical analysis.
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How many atoms are in 100.0 grams of neon, Ne?
Answer: 20.179 grams
I had to do a project on this recently, so here is your answer!
Hope this is helpful!
Answer:
2.894 x 10²⁴ atoms Ne
Explanation:
To find the amount of neon atoms, you need to (1) convert grams to moles (using the atomic mass) and then (2) convert moles to atoms (using Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator of the ratios in this case). The final answer should have 4 sig figs like the given value (100.0 = 4 sig figs).
Atomic Mass (Ne): 20.180 g/mol
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
100.0 g Ne 1 mole 6.022 x 10²³ atoms
-------------------- x ----------------- x ------------------------------- = 2.894 x 10²⁴ atoms
20.180 g 1 mole
Which is the MOST important safety measure to follow when using an acid in a classroom laboratory?
The most important safety measure to follow when using an acid in a classroom laboratory is wearing gloves, wear face shield and protective clothing etc
On performing experiments in a lab, then it is necessary to follow the instructions of the teacher and safety measures thoroughly so that any accident will not lead to any a major injury kind. Wearing gloves, goggles, and other safety gear is the minimum requirement for doing an experiment while the teacher is not present. protective clothing.To guarantee appropriate protection from concentrated acid spills, you must wear a face shield over your safety glasses, nitrile gloves (if available), and neoprene aprons.To learn more about face shield visit:
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Drag each tile to the correct box. Based on your observations in this task, rank the three types of substances according to the strength of the forces between particles, from weakest to strongest. Tiles polar substancesnonpolar substancesionic substances Sequence <
Intermolecular force is the force of attraction that holds the particles in the atom together. The force referred to in the question is the force that binds the various elements together when they come together.
The intermolecular forces presented in the answer options in order of strength to weakness are ion-dipole hydrogen bonds dipole-dipole and van der Waals forces. The dipole-dipole interaction is the strongest intermolecular attraction. These are the weakest intermolecular forces and exist between all types of molecules, whether ionic or covalent, polar or non-polar.
Solids usually have the strongest intermolecular forces compared to liquids and gases. In solids, they are incompressible and dense because the particles are close together. The weakest intermolecular force is the London dispersion force. London Dispersion Force The London dispersion force is also known as the induced dipole induced dipole because it is a temporary attractive force that generates a temporary dipole. London dispersion exists in nonpolar monatomic gases.
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Answer:
nonpolar substance < polar substance < ionic substance
Explanation:
Answer key
A classical radio station broadcasts at 93.5 MHz. Find the wavelength of this radiation, in meters, and the energy of one of these photons, in J