Answer:
Answer choices A, B, and C all contain a certain level (or amount, if you will) of Calcium Carbonate, but B. chalk contains the most amount out of all three.
Explanation:
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Suppose 0.258g of lead(II) acetate is dissolved in 250.mL of a 13.0 m M aqueous solution of ammonium sulfate.
Calculate the final molarity of acetate anion in the solution. You can assume the volume of the solution doesn't change when the lead(II) acetate is dissolved in it.
Round your answer to 3 significant digits.
Molarity is the estimation of the solute concentration in the solution. The final molar concentration of the acetate anion in the solution is 0.006 M.
What is Molarity?
Molarity is the ratio of the moles to the volume in liters.
Given,
Mass of lead (II) acetate = 0.258 gm
Volume of solution = 0.25 L
Moles are calculated as:
Moles = mass ÷ molar mass
= 0.258 g ÷ 325.29 g/mol
= 0.00079
Molarity is calculated as:
M = moles ÷ volume
= 0.00079 ÷ 0.25
= 0.0032
The molar concentration of the acetate ions: 2 × 0.0032 = 0.0064 M
Therefore, the molarity of the acetate anion in the solution is 0.006 M.
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Which of the following has eight valence electrons?
o ti4+
CI
Na+
O Kr
O all of the above
Answer:
all of the above
What part of the scientific method involves controlling variables while testing a hypothesis? (2 points) Select one: a. Analyzing data b. Conducting an experiment c. Drawing a conclusion d. Making observations
Answer:
D
Explanation:
best choice, makes the most sense
In the scientific method, conducting an experiment involves designing and performing controlled experiments to test a hypothesis and the correct option is option B.
Scientists manipulate the independent variable while controlling other variables (dependent and controlled variables) to observe and measure the effect on the dependent variable.
By controlling variables, scientists can isolate the factors that influence the outcome, ensuring that any observed changes are a result of the manipulated variable and not other unrelated factors. This step allows for the collection of reliable data, which is essential for drawing meaningful conclusions based on the evidence gathered from the experiment.
Thus, the ideal selection is option B.
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5pts. Chemistry multiple choice
Answer:
C. Xenon
Explanation:
The question only requires you to use your visual skills to identify the unknown gas. Look at the spectra of unknown gas and xenon, are they not identical? SInce they are same, the unknown sample must be xenon.
3.4x10^4=
In ordinary numbers
3.4x10^4 = 34000
3.4×104 = 3.4 ×10000 = 34×1000=34000
What is a ordinary number?In linguistics, ordinal integers or ordinal digit words are terms representing place or rank in sequential ordering; the order may be of a size, significance, record, and so on (e.g., "third", "tertiary").
They vary from cardinal digits, which mean quantity (e.g., "three") and other kinds of numerals.
Thus, 34000 is the answer.
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what is the study of matter called
how does resistance change with temperature? is there more resistance or less resistance at higher temperatures?
The resistance has a linear relationship with temperature because it increases as temperatures increases.
What is temperature?Temperature refers to the activity (motion or thermal energy) in the atoms that form molecules.
The resistance of an electric conductor increases as the temperature increases since the thermal energy of subatomic electrons also increases.
In conclusion, the resistance has a linear relationship with temperature because it increases as temperatures increases.
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4. It is desired to prepare 0.5 L of a 0.1 M solution of NaCl
from a 1 M stock solution. How many milliliters of the
stock solution must be taken for the dilution?
5. Calculate the osmotic pressure of a 0.5 M sucrose
solution if the temperature is 298 K.
4) 0.05 L of the stock solution must be taken.
5) The osmotic pressure would be 12.23 atm
Miscellaneous calculations
4) Using the dilution equation: m1v1=m2v2
m1 = 1M, m2 = 0.1M, v2 = 0.5L
v1 = m2v2/m1 = 0.1 x 0.5/1 = 0.05 L
5) Using the formula: osmotic pressure = icRT
Since sucrose does not ionize in water, i = 1
C = 0.5
R = 0.0821
T = 298
Osmotic pressure = 1 x 0.5 x 0.0821 x 298 = 12.23 atm
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What will the cleaning sanitation and storage of food contact surfaces of equipment and utensils help prevent?
Proper cleaning and sanitizing practices are critical in preventing bacteria that can cause foodborne illness.
Benefits of sanitizing:
Eliminates Pathogens.
Sanitizing Improves Home Odor.
Reduces Respiratory issues.
Decreases Allergy Flare-Ups.
Easy to Use.
Reduces Stress.
Helps the Immune System.
When and how to clean surfaces in your home.
Important to clean and sanitize kitchen premises
Cleaning your kitchen premises and equipment ensures that clean food preparation is carried out in order to improve kitchen efficiency and reduce environmental impacts.
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A 0.250 L solution is made with 1.60 g of glucose, in water at 25.00∘C. What is the osmotic pressure of the solution?
Use −273.15∘C for absolute zero.
Use R=0.08206 L atmmol K for the ideal gas constant
The osmotic pressure of the 0.250 L solution made with 1.60 g of glucose, in water at 25.00°C is 0.869atm.
How to calculate osmotic pressure?The osmotic pressure of the solution can be calculated using the following expression:
PV = nRT
where;
P = pressureV = volumen = no of molesT = temperatureR = gas law constantno of moles of glucose = 1.60g ÷ 180g/mol = 8.89 × 10-³mol
P × 0.250 = 0.00889 × 0.08206 × 298
0.25P = 0.217
P = 0.217/0.25
P = 0.869atm
Therefore, the osmotic pressure of the 0.250 L solution made with 1.60 g of glucose, in water at 25.00°C is 0.869atm.
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How many formula units are in 239.2g of
Br2
MgCl2
H2O
Fe
The formula units in the substances are as follows:
Br2 = 8.99 × 10^23 formula unitsMgCl2 = 1.51 × 10^24 formula unitsH2O = 2.57 × 10^24 formula unitsFe = 2.57 × 10^24 formula unitsHow many moles are in 239.2 g of the given substances?The moles of the substances are determined from their molar mass.
Molar mass of the substances is given as follows:
Br2 = 160 g/molMgCl2 = 95 g/molH2O = 18 g/molFe = 56 g/molFormula units = mass/molar mass × 6.02 × 10^23
The formula units in the substances are as follows:
Br2 = 239.2/160 × 6.02 × 10^23 = 8.99 × 10^23 formula unitsMgCl2 = 239.2/95 × 6.02 × 10^23 = 1.51 × 10^24 formula unitsH2O = 239.2/18 × 6.02 × 10^23 = 2.57 × 10^24 formula unitsFe = 239.2/56 × 6.02 × 10^23 = 2.57 × 10^24 formula unitsIn conclusion, the number of formula units is derived from the moles and Avogadro number.
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The sparse area surrounding a spiral galaxy is called its
Answer:
Halo
Explanation:
Vehicle air bags require that a very specific amount of gas is created so that the gas inflates the airbag without causing it to rupture.
Commonly, this is accomplished by decomposing sodium azide (NaN3) to produce sodium metal and nitrogen gas. How much sodium azide is required to produce 80.0 g of nitrogen gas?
The amount of sodium azide required will be 123.72 grams
Stoichiometric problemFrom the equation of the reaction below:
[tex]2NaN_3 --- > 2Na + 3N_2[/tex]
The mole ratio of sodium azide to nitrogen gas is 2:3
Mole of 80.0 g nitrogen = 80/28.02 = 2.855 moles
Equivalent mole of sodium azide = 2/3 x 2.855 = 1.903 moles
Mass of 1.903 moles sodium azide = 1.903 x 65 = 123.72 grams
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how do biotic components interact with abiotic components? explain with example.
Answer:
An ecosystem is defined by the interactions between the living and non-living things in any given area. Abiotic factors are the non-living components of an ecosystem. These include: air water, wind, soil, temperature, sunlight. One of the most critical interactions in an ecosystem between the biotic and abiotic environment is photosynthesis , the base chemical reaction that drives most life on earth. Plants and algae use sunlight, water and carbon dioxide to create the energy they need to grow and live via photosynthesis.
There are four main types of species interactions that occur between organisms in an ecosystem:
Predation , parasitism and herbivory – In these interactions, one organism benefits while the other is negatively affected.
* Competition – Both organisms are negatively affected in some way due to their interactions.
* Commensalism – One organism benefits while the other is neither harmed nor gains.
* Mutualism – Both organisms benefit from their interactions.
Plants with bird or butterfly pollinators are good examples of mutualistic interactions. Plants benefit by having their flowers pollinated so they can reproduce.
How many kilograms of NH3 are needed to produce 120 of pf3 if the reaction has 78.1% yield.
99.25 grams = .09925 Kg of fluorine gas is needed.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Balanced chemical reaction: P₄ (s) + 6F₂ (g) → 4PF₃ (g).
m(PF₃) = 120.0 g; mass of phosphorus trifluoride.
n(PF₃) = m(PF₃) ÷ M(PF₃).
n(PF₃) = 120 g ÷ 88 g/mol.
n(PF₃) = 1.36 mol.
From chemical reaction: n(PF₃) : n(F₂) = 4 : 6 (2 : 3).
n(F₂) = 1.36 mol · 3 / 2.
n(F₂) = 2.04 mol; amount of substance.
m(F₂) = n(F₂) · M(F₂).
m(F₂) = 2.04 mol · 38 g/mol.
m(F₂) = 77.52 g ÷ 0.781.
m(F₂) = 99.25 g.
Hence, 99.25 grams = .09925 Kg of fluorine gas is needed.
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Question 21
How many moles of O atoms are in 88 grams of CO₂?
2.8 moles
6.0 moles
1.00 moles
2.0 moles
4.0 moles
It takes 5.4 kJ to vaporize 1.6 moles of substance Z. What is the molar heat of vaporization of substance Z? Give your answer in units of kJ/mol with correct significant figures.
The molar heat of vaporization of substance Z is 3.375 kJ/mol.
Molar heat of vaporization of substance Z
The molar heat of vaporization of substance Z is calculated as follows;
ΔH(vap) = E/n
where;
E is the energy requiredn is number of molesΔH(vap) = 5.4 kJ/1.6
ΔH(vap) = 3.375 kJ/mol
Thus, the molar heat of vaporization of substance Z is 3.375 kJ/mol.
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4Al(s) + 30₂(g) → 2Al2O3 (s)
How many molecules of O₂ are used in the reaction?
How many oxygen atoms are required?
How many moles of Al2O3 are formed?
What is the mole ratio of Al to O₂?
How many total atoms are in 0.680 g of P₂O5?
Answer: 2.88×[tex]10^{24}[/tex]atoms [tex]P_{2}O_{5}[/tex]
Explanation: First, using stoichiometry, we must convert this from grams to moles, then from moles to atoms.
1. For the first step, we should also look at the periodic table to find the molar mass of the compound, then use that as the denominator.
[tex]0.680g P_{2} O_{5} *\frac{1molP_{2} O_{5} }{141.948gP_{2} O_{5} } =4.79mol P_{2} O_{5}[/tex]
2. Now that it is converted to moles, we must convert it to atoms by multiplying it by Avogadro's number.
[tex]4.79molP_{2} O_{5} *\frac{6.022X10^{23} }{1mol} =2.88*10^{24}[/tex]
With this information, we know that there are [tex]2.88X10^{24}[/tex] total atoms in 0.680 grams [tex]P_{2} O_{5}[/tex].
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Place a check mark next to each star that is only fusing hydrogen into helium at this time.
Answer:
star 3
Explanation:
the color determines the fusion in between
25g of gold with initially 27grade centigrade what is the final temperature uppon absorbing 2.3kj of heat
The final temperature of the mass of gold is 737 °C.
What is the specific heat capacity of gold?The specific heat capacity of gold is 0.126 J/g/K
The final temperature, T2 of the gold is calculated as follows:
T2 = T + Q/mc
where;
T is initial temperature, m is mass, and c is specific heat capacity of gold.
T2 = 27 + 2.3 x 1000/(25 x 0.126)
T2 = 737 °C
Therefore, the mass and heat capacity of gold determines its final temperature.
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how many moles of pbcl2 are produced when 16 alcl3 are consumed
what are correct statements about all greenhouse gases? check all that apply.
The correct statements about all greenhouse gases include the following:
They interact with wavelengths shorter than IR to produce IR. Their absorption spectra will show absorbance in the 400-700 nm region. What is greenhouse gas?These are gases which are found in the atmosphere and have varying effects on the energy present on earth.
Examples include carbon dioxide, methane etc and their characteristics are mentioned above.
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Sulfuryl chloride, SO2Cl2(g), decomposes at high temperature to form SO2(g) and
Cl2(g). The rate constant at a certain temperature is 4.68 x 10-5s-1. What is the the order of the reaction?
A) zero
B) first
C) second
D) third
E) More information is needed to determine the order.
The rate constant is s-1 which is the unit of first order reaction rate constant thus the reaction is a first order reaction. Option B
What is the rate of reaction?The term rate of reaction refers to how fast or slow a reaction proceeds a reaction could be;
First orderSecond order or Third orderWe can know the order of reaction here by looking at the unit of the rate constant. The rate constant is s-1 which is the unit of first order reaction rate constant thus the reaction is a first order reaction.
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Do the ch3f molecules appear to attract each other much? briefly describe their interaction.
Neither attract much nor allows it be free.
How the molecules behave in such way?
Because fluorine has a higher electronegativity than carbon and hydrogen, CH3F possesses a non-zero dipole moment. As a result, fluorine draws a partial negative charge whereas other atoms (such as carbon or hydrogen) draw a partial positive charge, leading to a non-zero dipole moment in CH3F. Lewis' structure, CH3F, is made up of one carbon atom, three hydrogen atoms, and one fluorine atom. Carbon is the key atom in the CH3F lewis structure because it is the least electronegative. The CH3F lewis dot structure consists of 3 lone pairs and a total of 4 bound pairs.
Properties of CH3F
It molar mass is 34.03 g/mol.The density of CH3F is 1.4397 g/L and 0.557 g/cm³ at saturated pressure and temperature.The melting point of CH3F is -137.8ºC and the Boiling point is -78.4ºC.Its vapor pressure is 3.3 MPa.Its IUPAC name is Fluoromethane.Know more about carbon here:
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what are the rules guiding iupac nomenclature?
Explanation:
Hope it helps you!!What is Lewis symbol for K+
Lewis symbol for K+ is given by a dot and K.
Meaning of Lewis symbolLewis symbols can be defined as a symbol the is used in describing the valence electron configurations of an atom ions.
A Lewis symbol consists of the symbol of the element and then surrounded by one dot for each of its valence electrons.
In conclusion, Lewis symbol for K+ is given by a dot and K.
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What’s the correct answer answer asap for brainlist
screen shot is attached , please help
Answer: 0.680 mol
Explanation:
From the coefficients of the equation, we know that for every 3 moles of carbon dioxide produced, 5 moles of oxygen gas are consumed.
So, the answer is (5/3)(0.408) = 0.680 mol (to 3 sf)
Calculate the osmotic pressure of a 5% solution of glucose at 18°C.
Answer:
6.97 atm is the osmotic pressure.