Answer:
The sample is a carbonate.
The unknown samples are Na2CO3 and K2CO3.
Explanation:
Let's assume ,the sample is Na2CO3.
Na2CO3 produces 2 moles of NaCl via formation of Na2O
Number of moles of NaCO3= 0.48262g/106gmol= 4.586×10^-3mol
Mass of NaCl= 2(4.586×10^-3)×58.5=0.536g
Let's assume the sample is K2CO3
K2CO3 produces2 moles of KCl
Number of moles of K2CO3= 0.4862g/138.21gmol
Number of moles= 3.517×10^-3mol
Mass of KCl formed= 2(3.517×10^-3)×74.55=0.5246g
how many significant gigures are in each mesasurments 303,000mm
The solid sink to the bottom when placed in a container of water. what does this tell you about it's density
It can be concluded that the density of solid is greater than 1 g/cm³.
We have a solid which sank to the bottom when placed in water.
We have to investigate about its density.
What is the density of water?The density of water is 1 g/cm³.
According to the question -
If a Solid body sinks in water, then it can be concluded that the density of this solid body is greater than that of water. Mathematically -
ρ(b) > 1 g/cm³
Hence, it can be concluded that the density of solid is greater than
1 g/cm³.
To solve more questions on fluids, visit the link below-
https://brainly.com/question/22984182
#SPJ2
Select all that apply.
Which of the following are interactions between particles in a liquid?
ionic bonds
covalent bonds
van der Waals forces
metallic bonds
hydrogen bonds
Answer is: van der Waals forces and hydrogen bonds.
Intermolecular forces are the forces between molecules or particles.
There are several types of intermolecular forces: hydrogen bonding, ion-induced dipole forces, ion-dipole forces andvan der Waals forces.
Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.
Covalent bonds, ionic bonds and metallic bonds are intramolecular interactions, bonds between atoms in molecule.
Is Co a chemical compound
How many moles of oxygen are necessary to completely react with propane (C3H8) to produce 16.3 mol of water according to the following balanced chemical equation? ________________________________________________________________________ C3H8 + 5 O2 -> 3 CO2 + 4 H2O
I tried doing these they are due by 12:00 please help i have 2 more like this
Answer:
20.375 moles of oxygen are necessary to completely react with propane to produce 16.3 moles of water.
Explanation:
[tex]C_3H_8 + 5O_2\rightarrow 3 CO_2 + 4H_2O[/tex]
Mole sof water formed = 16.3 moles
According to reaction , 4 moles of water are obtained from 5 moles of oxygen.
Then 16.3 moles of oxygen will be obtained from:
[tex]\frac{5}{4}\times 16.3 mol =20.375 mol[/tex] of oxygen
20.375 moles of oxygen are necessary to completely react with propane.
Which has a higher frequency, a neutron or electron? Why?
1. Gases are made up of molecules which are relatively far apart.
2. The molecules are in motion at high speeds.
3. The molecular collisions are perfectly elastic.
4. Increase in temperature increases the kinetic energy of the molecules.
Which of the above assumptions accounts for the compressibility of gases as compared to liquids and solids?
A) 1
B) 2
C) 3
D) 4
E) 2 and 3
F) 3 and 4
The assumption that accounts for the compressibility of gases is that gases consist of molecules which are relatively far apart, meaning the correct answer is A) 1.
In regards to the compressibility of gases, the relevant kinetic molecular theory assumption is that gases consist of molecules which are relatively far apart. This is captured in assumption 1 provided in the student's question. When the particles are far apart, there is a considerable amount of empty space between them compared to liquids and solids. This space allows gases to be compressed, as-the molecules can be brought closer together without significant repulsive forces coming into play due to the fact that there are no significant intermolecular forces acting over these large distances. Therefore, the correct answer to the question - which assumption accounts for the compressibility of gases as compared to liquids and solids - is A) 1.
Draw a complete Lewis structure for the conjugate acid of nitromethane that shows all bonds, unshared electron pairs, and minimized formal charges, where appropriate.
Answer:
Lewis structures are shown below
Explanation:
In Lewis structure of nitromethane, a negative charge is present on oxygen atom in nitro group.Hence this oxygen atom acts as a basic center preferably.Therefore conjugate acid of nitromethane should be drawn by adding a hydrogen atom with this oxygen atom.Lewis structure of nitromethane as well as it's conjugate acid has been shown below including all the lone pairs and formal chargesChemical changes ________ involve the breaking and making of chemical bonds.
A) Always
B) Never
C) Sometimes
Fill in the blank
Answer:
A: Always.
Explanation:
Got it correct on Oddesyware
What role do valence electrons play in the formation of compounds from elements?
Final answer:
Valence electrons are pivotal in chemical bonding, participating in either sharing (covalent bonding) or transferring (ionic bonding) to achieve stable electronic configurations aimed at fulfilling the octet rule. Electronegativity influences the nature of these bonds, and the valence bond theory explains the formation of stable compounds through energy considerations.
Explanation:
Valence electrons play a crucial role in the formation of compounds from elements. These electrons are located in the atom's outermost shell and are the primary participants in chemical bonding. Elements combine to form compounds by either sharing valence electrons (covalent bonding) or transferring them (ionic bonding) to achieve stable electronic configurations, often aiming for the octet rule, which is a full set of eight valence electrons that provides stability, reminiscent of the noble gases.
Electronegativity significantly influences how these electrons are shared or transferred. Atoms with higher electronegativity tend to attract valence electrons more strongly, leading to polar covalent or ionic bonds depending on the difference in electronegativity between the bonding atoms.
Select the ion.
a) NO2
b)H2SO4
c) Al+3 ...?
i would go with C. Al+3
phosphorus has an atomic mass of 31 and an atomic number of 15 ,so the number of nuetrons must be ?
In each of the following pairs of compounds, which compound is likely to be more soluble in CCl4?
a) Br2 or NaBr
b) CH3OH or C6H11OH
c) CS2 or KOH
d) I2 or CaF2
The principle 'like dissolves like' is used to determine the solubility of compounds in CCl₄. These are more likely to dissolve: Br₂ over NaBr, C₆H₁₁OH over CH₃OH, CS₂ over KOH, and I₂ over CaF₂.
Explanation:The solubility of compounds in CCl₄ can be calculated using the principle 'like dissolves like', which means that substances with similar types of molecular interactions dissolve in each other. Therefore, compounds with similar polarity will dissolve in each other.
a) Br₂ vs NaBr: Br₂, being nonpolar like CCl₄, is expected to be more soluble. NaBr is an ionic compound, and hence it won't dissolve well.b) CH₃OH vs C₆H₁₁OH: Both are alcohols but CH₃OH contains polarity due to the presence of O-H bonds whereas C6H11OH is less polar. Therefore, C6H11OH would be more soluble in CCl₄.c) CS₂ vs KOH: CS₂ is a nonpolar compound like CCl₄, hence it is expected to be more soluble. KOH is ionic and wouldn't dissolve well.d) I₂ vs CaF₂: I₂ is nonpolar and would therefore be more soluble in CCl₄. CaF₂ is ionic and wouldn't dissolve well.Learn more about Solubility here:https://brainly.com/question/28170449
#SPJ12
Final answer:
The more soluble compounds in carbon tetrachloride (CCl₄) are those that are non-polar: Br₂, C₆H₁₁OH, CS₂, and I₂, because CCl₄ is a non-polar solvent and 'like dissolves like'.
Explanation:
The question asks which compound in each pair is likely to be more soluble in carbon tetrachloride (CCl₄). Solubility often depends on the similarity principle 'like dissolves like', meaning that polar solvents dissolve polar substances, and non-polar solvents dissolve non-polar substances.
a) Br₂ or NaBr: Br₂ (bromine) is a non-polar molecule, while NaBr (sodium bromide) is an ionic compound. Br₂ will be more soluble in CCl₄ since both are non-polar.
b) CH₃OH or C₆H₁₁OH: C₆H₁₁OH (cyclohexanol) is less polar and has a longer non-polar hydrocarbon chain compared to CH₃OH (methanol). Thus, C₆H₁₁OH will be more soluble in CCl₄.
c) CS₂ or KOH: CS₂ (carbon disulfide) is a non-polar molecule, while KOH (potassium hydroxide) is an ionic and polar compound. CS₂ will be more soluble in CCl4.
d) I2 or CaF₂: I₂ (iodine) is a non-polar molecule, while CaF₂ (calcium fluoride) is an ionic compound. I2 will be more soluble in CCl₄.
what is mole concept?
A biochemist performs an experiment to study the behavior of water molecules near proteins. He concludes that water molecules occur in groups of five in the presence of proteins. Skepticism is important in this scenario because it would help him to
Skepticism is important to the biochemist to critically evaluate and verify the conclusion about the behavior of water molecules near proteins.
Explanation:Skepticism is important in this scenario because it would help the biochemist to critically evaluate and verify the conclusion that water molecules occur in groups of five in the presence of proteins. By maintaining a skeptical mindset, the biochemist can consider alternative explanations, conduct further experiments, and review existing research to ensure the validity and accuracy of the conclusion. Skepticism plays a crucial role in scientific inquiry and helps to ensure that scientific findings are reliable and trustworthy.
Learn more about Importance of skepticism in scientific inquiry here:https://brainly.com/question/129067
#SPJ3
How many times does the moon rotate on its axis in one month
The Maunder Minimum would include which of the following years?
Monel metal is a corrosion-resistant copper-nickel alloy used in the electronics industry. A particular alloy with a density of 8.80 g/cm3 and containing 0.073% Si by mass is used to make a rectangular plate that is 15.0 cm long, 12.5 cm wide, and 2.50mm thick and has a 2.50-cm-diameter hole drilled through its center such that the height of the hole is 2.50mm .
The silicon in the plate is a mixture of naturally occurring isotopes. One of the those isotopes is silicon-30, which has an atomic mass of 29.97376 amu and a percent natural abundance of 3.10%
How many silicon-30 atoms are found in this plate?
Express your answer numerically using two significant figures.
The number of silicon-30 atoms in the plate can be calculated using the concept of percent abundance and Avogadro's number. Plugging in the given values, the calculated number of silicon-30 atoms is approximately 4.59 x 10^19.
The number of silicon-30 atoms in the plate can be calculated using the concept of percent abundance and Avogadro's number.
First, we need to determine the mass of the silicon-30 in the plate.
The mass of silicon in the plate can be found by multiplying the mass of the plate by the mass fraction of silicon:
Mass of silicon = Mass of plate x Mass fraction of silicon = (Volume of plate x Density of plate) x Mass fraction of silicon
Next, we can calculate the number of moles of silicon-30:
Number of moles of silicon-30 = Mass of silicon / molar mass of silicon-30
Finally, we can convert the number of moles into the number of atoms using Avogadro's number:
Number of silicon-30 atoms = Number of moles of silicon-30 x Avogadro's number
Plugging in the values, we get:
Number of silicon-30 atoms = (Volume of plate x Density of plate x Mass fraction of silicon) / molar mass of silicon-30 x Avogadro's number
Now, let's calculate the values:
Volume of plate = Length x Width x Thickness - Area of hole x Height of hole
Area of hole = π x (Diameter of hole / 2)^2
Plugging in the values, we get:
Volume of plate = (15.0 cm x 12.5 cm x 2.50 mm) - (π x (2.50 cm / 2)^2 x 2.50 mm)
Now, we can substitute the calculated values into the formula to find the number of silicon-30 atoms:
Number of silicon-30 atoms = ((15.0 cm x 12.5 cm x 2.50 mm) - (π x (2.50 cm / 2)^2 x 2.50 mm) x 8.80 g/cm^3 x 0.073% Si) / (29.97376 g/mol) x (0.0310)
Calculating this expression gives approximately 4.59 x 10^19 silicon-30 atoms in the plate.
Final answer:
By calculating the mass of the Monel plate, the mass of silicon within it using the percent composition, and applying the natural abundance of silicon-30, we find approximately 1.9 × 10²⁰ silicon-30 atoms in the plate.
Explanation:
To calculate the number of silicon-30 atoms in a Monel metal plate with a density of 8.80 g/cm³ that measures 15.0 cm by 12.5 cm and is 2.50 mm thick, having a hole of 2.50 cm diameter, we need to follow these steps:
Determine the volume of the plate (including the hole).
Calculate the mass of the plate using its density.
Find the mass of silicon in the plate using the percent composition.
Calculate the number of moles of silicon based on its mass.
Use the percent natural abundance of silicon-30 to find the moles of silicon-30 specifically.
Use Avogadro's number to convert moles of silicon-30 to the number of atoms.
Let's perform the calculation:
Volume of plate without the hole = (15.0 cm × 12.5 cm × 0.25 cm) = 46.875 cm³
Volume of the hole = (π × (1.25 cm)²) × 0.25 cm = 1.227 cm³
Total volume = 46.875 cm³ - 1.227 cm³ = 45.648 cm³
Mass of plate = Density × Volume = 8.80 g/cm³ × 45.648 cm³ = 401.7 g
Mass of Si in plate = 401.7 g × 0.00073 = 0.293 g
Moles of Si = Mass / Molar mass = 0.293 g / 28.085 g/mol = 0.01044 mol
Moles of Si-30 = Total moles of Si × Percent abundance of Si-30 = 0.01044 mol × 0.0310 = 0.0003236 mol
Number of Si-30 atoms = Moles of Si-30 × Avogadro's number = 0.0003236 mol × 6.02 × 10²³ atoms/mol
The number of silicon-30 atoms in the plate is approximately 1.9 × 10²⁰ atoms, rounded to two significant figures.
increase Crop Production food Engineers combine two plants so that each plant strength compensates for the others weakness what is this technique called
Answer: Cross breeding
Explanation: Cross breeding can be defined as the method by which two plants can be crossed to produce the desired character and compensate the useless characters shown by the plants individually.
Suppose a plant produces pink flower but small slower and another plant produces white flower but big flower.
If we want big pink colored flower then, these two plants can be crossed among each other so to produce the desired characters and hide the useful characters.
What is the most basic building block of matter?
Question 2 options:
the atom
the quark
the electron
the proton
: The Atom
~Sarah Robinsen
A molecule of carbon dioxide (CO2) contains two polar covalent bonds. Why is the molecule nonpolar?
Answer:
The molecule has a symmetrical distribution of charge.
Explanation:
A CO2 molecule is nonpolar because the molecule is linear and has a symmetrical distribution of charge as seen in this diagram:
How do I calculate the molecular formula for a compound with an empirical formula CH2O and a molar mass of 90 g/mol?
When 1 mole of tin IV oxide is heated with 2 moles of hydrogen gas, 1 mole of tin metal and 2 moles of water vapor are generated. SnO2 + 2H2 → Sn + 2H2O How many moles of tin metal will be produced when 0.74 moles of tin IV oxide is heated?
Answer : The moles of tin metal produced will be, 0.74 mole
Explanation : Given,
Moles of [tex]SnO_2[/tex] = 0.74 mole
The given balanced chemical reaction is,
[tex]SnO_2+2H_2\rightarrow Sn+2H_2O[/tex]
From the balanced chemical reaction, we conclude that
As, 1 mole of [tex]SnO_2[/tex] react to give 1 mole of Sn
So, 0.74 mole of [tex]SnO_2[/tex] react to give 0.74 mole of Sn
Therefore, the moles of tin metal produced will be, 0.74 mole
If 255 g of water has 10.0 g of nacl dissolved into initially, how much nacl must be added in order to raise the mass percent of nacl by 10%
Answer: 30.8 g
Explanation:
HELLLLLLLLLLLLP ME PLS 10 points pls
What do the symbols in parenthesis indicate?
CaCl2(aq) + 2AgNO3(aq)) → Ca(NO3)2(aq) + 2AgCl(s)
1 the catalyst used in the reaction
2 the number of atoms of each reactant and product
3 the physical state of each reactant and product
4 the number of units of each reactant and product
A mixture of methane and air is used in a lime kiln. Explain why?
When is a secondary source more helpful than a primary source?
A: When you are an expert in the field being studied in the experiment
B: When you do not need many details about the experiment
C: When you want to know the exact data values
D: When you do not need to know the conclusion of the experiment
Answer:
B: When you do not need many details about the experiment
Explanation:
Primary Sources are the first-hand accounts of the topic.
Secondary sources are the scholarly books or articles.
The secondary source interprets and also analyzes the primary sources.
Thus, secondary data can be used as a precursor for publishing new primary data.
Thus, Option B: When you do not need many details about the experiment is correct.
what is the name given to the electrons in the highest occupied energy level of an atom
What is the mass of 5.05×1021 platinum atoms?
Answer: 1.6 gram
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given atoms}}{\text {Avogadro's Number}}[/tex]
[tex]\text{Number of moles of water}=\frac{5.05\times 10^{21}}{6.023\times 10^{23}}=8.4\times 10^{-3}moles[/tex]
1 mole of Platinum [tex]Pt[/tex] weighs 195 g
[tex]8.4\times 10^{-3}moles[/tex] of Platinum [tex]Pt[/tex] weigh =[tex]\frac{195}{1}\times 8.4\times 10^{-3}=1.6g[/tex]
Thus mass of [tex]5.05\times 10^{21}[/tex] platinum atoms is 1.6 gram.
Final answer:
To calculate the mass of 5.05×10²¹ platinum atoms, first find the number of moles using Avogadro's number, then multiply by the atomic mass of Pt, yielding approximately 1.636 grams of Pt.
Explanation:
To determine the mass of 5.05×10²¹platinum atoms, we need to use Avogadro's number (6.022×10²³ atoms/mol) and the atomic mass of platinum (Pt), which is approximately 195 g/mol. First, we calculate the number of moles of platinum atoms:
Number of moles = Number of atoms / Avogadro's number
Number of moles= 5.05×10²¹Pt atoms / 6.022×10²³ Pt atoms/mol
= 8.39×10⁻³ mol Pt
Next, we find the mass of the platinum atoms by multiplying the number of moles by the atomic mass of platinum:
Mass = Number of moles × Atomic mass of Pt
= 8.39×10⁻³ mol Pt × 195 g/mol
= 1.63605 g of Pt
Therefore, the mass of 5.05×10²¹ platinum atoms is approximately 1.636 g.
Which temperature is coldest??
The temperature 0 degree Celsius is the coldest temperature , Option B is the correct answer.
The complete Question is attached with the answer in form of image
What is Temperature ?The degree of heat a body has measured by the thermometer is called Temperature.
It is asked in the question to determine , which temperature is coldest among the option given
The temperature 0 degree Celsius is the coldest temperature among the options given as it is the lowest
Therefore Option B is the correct answer.
To know more about Temperature
https://brainly.com/question/7510619
#SPJ2