Hello and Good Morning/Afternoon
Let's consider all the choices to determine the attributes of isotopes
Choice (A) is wrong⇒ isotopes are often found in nature as they are often the atoms
that form the world around us
Choice (B) is wrong⇒ isotopes describe a certain type of atom with a certain
characterist that exists, thus it isn't theoretical
Choice (C) is wrong⇒ as said before, isotopes are found in nature and form the world
Choice (D) is correct⇒Isotopes are a type of atoms thus they are found in nature
Answer: (D)
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Answer:
D. found in nature.
Explanation:
Isotope is any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights. There are 275 isotopes of the the 81 stable elements, in addition to over 800 radioactive isotopes, and every element has known isotopic forms. Isotopes of a single element possess almost identical properties. An isotope of an element is just a version of that element with a particular number of neutrons. Some numbers are stable, some are not; the ones that aren't shoot particles out at extremely high speeds ("radiation").
Since radioisotopes generally have the same chemistry as their stable counterparts (since neutrons play almost no role in chemistry), they'll get wherever other atoms of that element would get. Iodine, for example, accumulates in your thyroid gland - so do radioactive forms of iodine, which can then cause thyroid cancer by irradiating it from the inside.
Also because they're chemically almost indistinguishable, they're almost impossible to separate out by any normal means. It's like giving someone a giant bin of golf balls, some of which are 1% heavier than the other golf balls but are otherwise exactly the same, and saying "okay, sort these". Except the golf balls are atoms and the bin is the size of a small country.
how many moles of pbcl2 are produced when 16 alcl3 are consumed
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 is the study of matter called
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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Calculate the osmotic pressure of a 5% solution of glucose at 18°C.
Answer:
6.97 atm is the osmotic pressure.
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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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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What’s the correct answer answer asap for brainlist
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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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.
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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116) If the juice from a lemon is mixed with 55% water the lemon juice is the A) solution B) solute C) solvent D) None of the above
117) If the juice from a lemon is mixed with 55% water the water is the A) solution B) solute C) solvent D) None of the above
118) Which of the following is NOT c onsidered a solution? A) Gasoline B) Coca-Cola C) Water
119) Which statement is true? D) Bleach A) All mixtures are solutions. B) All mixtures are acidic. C) All solutions are mixtures. D) All solutions are alkalizing
120) Which of the following is considered a solution? A) 14k gold ring C) Sand in the ocean B) Wood chips on the ground D) Rocks in water
Answer:
Explanation:
d because a b and c is in correct
Oxygen decays to form nitrogen. 15 8 O → 15 7 N + 0 1 e This type of nuclear decay is called
The type of nuclear decay in which Oxygen decays to form nitrogen is beta plus decay.
What is a beta plus decay?A beta plus decay is a type of decay in which a proton in an element disintegrates to produce a neutron resulting in a decrease in the atomic number of the radioactive element.
In the given equation below:
[tex]^{15}_{7}O \rightarrow ^{15}_{7}N + ^{0}_{1}e[/tex]Oxygen decays to form nitrogen due to a decrease in atomic number.
This is an example of beta plus decay.
In conclusion, oxygen decays to form nitrogen beta plus decay.
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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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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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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)
A section of a high speed test track is circular with a radius of curvature R = 1860 m.
At what angle of θ should the track be inclined so that a car traveling at 61.0 m/s (136 mph) would keep moving in a circle if there is oil on that section of the track, i.e., it would not slip sideways even with zero friction on that section. (Hint: The car's vertical acceleration is zero.)
Using Newton's second law, the car is experiencing a net force parallel to the banked curve such that
[tex]mg \sin(\theta) = \dfrac{mv^2}r \implies \sin(\theta) = \dfrac{v^2}{rg}[/tex]
where [tex]v[/tex] is the tangential speed of the car and [tex]r[/tex] is the radius of the curve. Solve for [tex]\theta[/tex] :
[tex]\sin(\theta) = \dfrac{\left(61.0\frac{\rm m}{\rm s}\right)^2}{(1860\,\mathrm m)g} \approx 0.204 \implies \theta = \sin^{-1}(0.204) \approx \boxed{11.8^\circ}[/tex]
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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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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I NEED HELP!!!
How much heat (kJ) is needed to raise the temperature of 100.0 grams of water from 290.0 K to 325.0 K?
(Specific Heat of Water = 4.18 J/g °C)
• 10450
• 146
• 14630
• 10.5
• 14.6
Answer:
Explanation:
Formula
Heat = m * c * delta t
t = temperature in centigrade.
The first thing you have to do is convert kelvin degrees to centigrade. The conversion factor is - 273. The formula is degrees centigrade = degrees kelvin - 273. It is easier to understand with a couple of examples.
290o K = 290 - 273 = 17325. K = 325 - 273 = 52Solution
Heat = 100.0 grams * 4.18 J/g*C * (52 - 17)
Heat = 100 * 4.18 * 35
Heat = 14630 Joules
But you want kj
Heat = 14630 / 100 = 14.63
Answer
Heat = 14.6 kj
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.
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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What is the definition of specific heat? O A. The heat required to break the molecular bonds within a substance B. The total amount of energy contained within 1 mole of a substance C. The heat needed to raise the temperature of 1 g of a substance 1°C D. The temperature change between the melting and boiling points of a substance N What is the definition of specific heat ? O A. The heat required to break the molecular bonds within a substance B. The total amount of energy contained within 1 mole of a substance C. The heat needed to raise the temperature of 1 g of a substance 1 ° C D. The temperature change between the melting and boiling points of a substance N
Answer:
C
Explanation:
C . specific heat = J / gm-C
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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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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Which of the following has eight valence electrons?
o ti4+
CI
Na+
O Kr
O all of the above
Answer:
all of the above
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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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
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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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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