Answer:
4 days
Explanation:
A radioactive cloud is said Ron contain Iodine-131. It has a half-life of 8 days. If the waste must decay to a concentration of less than 0.1% to be considered safe, then it will take approximately 4 days days to reach safe levels under normal circumstances.
Answer:
100/2 ➙ 50/2 ➙ 25/2 ➙ 12.5/2 ➙ 6.25/2 ➙ 3.13/2 ➙ 1.56/2 ➙ 0.78/2 ➙ 0.39/2 ➙ 0.195/2 ➙ 0.0975
10 half lives x 8 days/half live = 80 days
Which element, Phosphorus or Calcium, is more reactive? Why?
Answer:
phosphorus is more reactive than calcium
Explanation:
Which of the following forms a water solution that will conduct electricity?
F. CaCl2
G. CO2
H. NO2
J. SiF4
Answer: F. CaCl2
Explanation:
Calcium Chloride (CaCl2) is an ionic compound. In an aqueous state,this compound is a good conductor of electricity.
Time (s) [NO2] (mol/L) 0 0.500 1,200 0.444 3,000 0.381 4,500 0.340 9,000 0.250 (Note: The rate law only depends on the concentration of NO2.) Consider the reaction NO2(g) + CO(g) → NO(g) + CO2(g). The data in the table was obtained by observing the reaction. What is the order of this reaction? A. zero order B. first order C. second order D. third order
Answer:
C on plato good luck
Explanation:
What are all substances made of?
Answer:
Atoms
Explanation:
Substances are made up of millions of atoms that make up of molecules, then particles, until a matter is in shape.
Answer:
substances made of atoms or molecules
Explanation:
these atoms and molecules can be combined using chemical bonding or without chemical bonding
name 3 uses for mercury
hydrargyrum , hg swiftplanet, quicksliver
Explanation:
Answer:
Mercury is used in thermometers, barometers, manometers, sphygmomanometers, float valves, mercury switches, mercury relays, fluorescent lamps and other devices, though concerns about the element's toxicity have led to mercury thermometers and sphygmomanometers being largely phased out in clinical environments in favor ...
Explanation:
i know this will help because i got this right
10. If 32.4 mole of CO react with excess Fe2O3, how many moles of Fe will form?
Answer: 21.6 mol of Fe
Explanation:
Fe2O3 + 3 CO → 2 Fe + 3 CO2
32.4 mol CO x __2 mol Fe__ = 21.6 mol of Fe
3 mol CO
Calculate the pOH of a solution if the concentration of hydroxide ions (OH-) is 1.9 x 10-5M?
Answer:
9.28
Explanation:
pOH refers to a measure of hydroxide ions concentration. pOH tells about the alkalinity of a solution. If pOH is less than 7 then aqueous solutions are alkaline, acidic if pOH is greater than 7 and neutral if pOH is equal to 7.
Concentration of the hydroxide ions = 1.9 x 10-5 M
pH = [tex]-log(1.9\times 10^{-5})=4.72[/tex]
pOH = 14 - pH
=14 - 4.72 = 9.28
Why is the C-14/C-12 ratio used to date once-living organisms?
The C-14/C-12 ratio is used to date once-living organisms because C-12 is fixed value of any organisms but the value of C-14 is constantly decreasing by time and so every organism have their specific ratio of C14/C12 .
What do you mean by C-14 and C-12 isotope ?Carbon-12 and carbon-14 are two isotopes of the element carbon. The difference between carbon-12 and carbon-14 is the number of neutrons in each of their atoms.
Because of the different number of neutrons, carbon-12 and carbon-14 differ in terms of radioactivity. Carbon-12 is a stable isotope carbon-14, on the other hand, undergoes radioactive decay:
146C → 147N + 0-1e
C-12 is fixed value of any organisms but the value of C-14 is constantly decreasing by time and so every organism have their specific ratio of C14/C12 ,hence due to this reason the C-14/C-12 ratio used to date once-living organisms .
Learn more about C-14 and C-12 isotope, here:
https://brainly.com/question/9918294
#SPJ2
Final answer:
The C-14/C-12 ratio is used to date once-living organisms by comparing the ratios in living and deceased organisms to calculate the age.
Explanation:
The C-14/C-12 ratio is used to date once-living organisms because after death, the C-14 isotope decays at a known rate, leading to a decrease in the ratio. By comparing this ratio to the ratio in living organisms, scientists can determine the age of the once-living organism by calculating the number of half-lives that have passed.
What can you predict from an element's location on the periodic table?
it's properties
it's chemical name
it's chemical symbol
when it was discovered
Answer:
properties
Explanation:
the location on the periodic table can indicate periodic trends such as electronegativity, ionization energy and also the proton amount of the element.
Final answer:
The periodic table allows predictions about an element's properties and behavior based on its location. The group number indicates valence electrons and chemical reactivity, and elements in the same group share similar chemical properties. The periodic table also provides insights into atomic radius, ionization energies, electron affinities, and electronegativity.
Explanation:
The periodic table provides valuable information about an element's properties and behavior. The number of valence electrons, which determines an element's reactivity, can be determined by its group number on the periodic table. Elements in the same group often have similar chemical properties. Additionally, the location of an element on the periodic table can provide insights into its atomic radius, ionization energies, electron affinities, and electronegativity.
What is the major cause of erosion and weathering that affects coastline features?
Answer:
Image result for What is the major cause of erosion and weathering that affects coastline features?
Coastal erosion, which is the wearing away of coastal land or beaches, is mainly caused by the impact of waves along the shoreline. This is accentuated during storms when waves are large and crash on shore with a lot of energy. ... As the sand and rocks crash into the coast, they grind away land and rock.
Explanation:
Final answer:
The major cause of erosion and weathering affecting coastline features is the action of ocean waves which crash against coastal landscapes, leading to wear and the transport of rock fragments. Water is a key weathering agent and topographical features as well as climate influence the rate of erosion.
Explanation:
The major cause of erosion and weathering that affects coastline features is the action of ocean waves. These waves, through their persistent energy, crash against beaches and coastal cliffs, leading to erosion and the eventual collapse of land masses. Water is a significant weathering agent in the lithosphere, where it contributes to the breakdown of rock into fragments, which can be transported and redeposited elsewhere, shaping various earth surfaces, including river valleys and rocky beach coastlines. Erosion and weathering are influenced by a number of factors including climate, topography, and the presence of water, which promotes biological activity and affects soil characteristics.
Erosion by rivers, glaciers, or ocean waves can create over-steepened slopes that are prone to collapse under certain conditions, such as heavy rains, earthquakes, or the weight of accumulated materials. The role of water in weathering processes is also important for the ecosystem, as it increases the content of dissolved minerals crucial for plants and animals living in water bodies.
Which of these formulas contain equal numbers of nitrogen atoms?
I. CO(NO3)2
II. (NH2)2CO,
III. (NH),PO,
IV. AI(NO3)2
V. NH.NO,
A
Formulas I and III
B
Formulas I and IV
C
Formulas II and III
D
Formulas I, II, and v
Answer:
Its D
Explanation:
Because 1 nitrogen atom is N2 and theres an N2 in all of those
Formulas I, II, and III each contain an equal number of nitrogen atoms.
Explanation:To determine which formulas contain an equal number of nitrogen atoms, we need to count the number of nitrogen atoms in each formula.
Formula I: CO(NO3)2 - This formula has 2 nitrogen atoms.Formula II: (NH2)2CO - This formula has 2 nitrogen atoms.Formula III: (NH4)2PO - This formula has 2 nitrogen atoms.Formula IV: Al(NO3)3 - This formula has 3 nitrogen atoms.Formula V: NH4NO2 - This formula has 1 nitrogen atom.From the count, we can see that formulas I, II, and III each contain an equal number of nitrogen atoms.
Learn more about Number of nitrogen atoms in chemical formulas here:https://brainly.com/question/10055892
#SPJ2
why does mars take 462.3 earth days more than venus to revolve around the sun A.mars is cooler then Venus B. Mars is lighter then Venus C. the sun is closer to Venus then it is to mars D. the diameter of mars is less then that of Venus
Answer:
Explanation:because The Sun is closer to Venus than it is to Mars. The distance between the Sun and Mars is approximately little more than twice the distance between the Sun and Venus. Mars has to cover a longer distance in its orbit than Venus. Hence, Mars takes about 462.3 Earth days more than Venus to revolve around the Sun.
Mars takes longer to revolve around the Sun than Venus because it is farther from the Sun, as described by Kepler's third law of planetary motion, which relates orbital period to distance from the Sun.So,option C is correct.
The reason why Mars takes 462.3 Earth days more than Venus to revolve around the Sun is because the Sun is closer to Venus than it is to Mars. This is directly related to Kepler's third law of planetary motion, which states that the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. In simpler terms, this means that planets farther from the Sun take longer to complete an orbit.
Venus is much closer to the Sun, with an orbital period of approximately 225 Earth days. On the other hand, Mars is farther away from the Sun, resulting in a significantly longer orbital period of about 687 Earth days. The difference in orbital periods is a consequence of their respective distances from the Sun rather than their physical characteristics, such as temperature, mass, or diameter.
How much force is required to lift a 100kg barbell with an acceleration of 3 m/s2?
Answer:
300N
Explanation:
Mass = 100kg
Acceleration = 3m/s²
Force = mass × acceleration
F = ma
Force = 100 × 3
Force = 300N
The force required to move 100kg of barbell with an acceleration of 3m/s² is 300N
What is the net force acting on the box
Answer: 65 N
Explanation:
I just did the question
Find the volume. *
1)
6 in
11 in
Volume =
Known :
r = 6 in
h = 11 in
Asked :
Volume = ...?
Answer :
V = πr²h
= 3.14 × 6² × 11
= 3.14 × 36 × 11
= 3.14 × 396
= 1,243.44 in³
So, the volume is 1,243.44 in³ (2nd choice)
Hope it helpful and useful :)
In most animals, combinations of various tissues make up
functional units
called
Answer:
Animal tissues are grouped into four basic types: connective, muscle, nervous, and epithelial. Collections of tissues joined in units to serve a common function compose organs.
Explanation:
Final answer:
In multicellular animals, tissues such as epithelial, connective, muscle, and nervous form organs with specific functions, which then contribute to various organ systems maintaining life processes within the organism.
Explanation:
In the biological organization of multicellular animals, the combinations of various tissues make up functional units known as organs. These tissues include groups of similar cells that perform related functions. There are four main types of animal tissues: epithelial, connective, muscle, and nervous tissues. Epithelial tissue covers the body surfaces and lines body cavities, connective tissue supports and binds other tissues, muscle tissue is responsible for movement, and nervous tissue is involved in receiving and transmitting nerve impulses.
Each of these tissues contributes to the formation of organs, which are essential structures with specialized functions necessary for the survival of the organism. These organs are then organized into systems such as the digestive, circulatory, and nervous systems, all cooperating to maintain the life processes within the animal body.
Which of the following is a property of an acid?
1. Acids become slippery when dissolved in water.
2. Acids react with metals to form hydrogen gas.
3. Acids produce salts when mixed with other acids.
4. Acids become more acidic when mixed with a base.
The modern periodic table is different from Mendeleevs in several ways. In which way are the two tables the same?
Mendeleev's and the modern periodic table are both organized by increasing atomic number, grouped into periods and groups showing reactivity and physical properties. Both tables also divide into metals, nonmetals and accommodation for chemical families.
Explanation:Both Mendeleev's periodic table and the modern periodic table are organized based on increasing atomic number and have a structure that groups elements into periods (horizontal rows) and groups (vertical columns). This arrangement shows patterns of chemical reactivity and physical properties. Furthermore, both tables accommodate the division into metal and nonmetals, and have provisions for chemical families, such as the alkali metals, alkaline earth metals, halogens, and noble gases.
Learn more about Periodic Tables here:https://brainly.com/question/35461104
#SPJ2
A standard hydrogen atom has how many neutrons?
A. 0
B. 3
C. 2
D. 1
Answer:
D. 1
Explanation:
Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Hydrogen is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.
Answer:
D.1 is the correct answer
Explanation:
The gas sample has a volume of 69.0 μL at 24.2 °C . What is the volume of the gas after the sample is cooled to 8.3 °C at constant pressure? V = μL Which tube represents the gas after the sample is cooled at constant pressure? A
At the constant pressure, the volume of the gas was equal to 65.31 μL at a temperature of 8.3ºC.
What is Charles's law?Charles's law can be described as that when pressure is kept constant, the volume of gas is directly proportional to its temperature.
Therefore, V ∝ T
[tex]\frac{V_1}{T_1} =\frac{V_2}{T_2}[/tex] ..................(1)
Given, the initial temperature of the gas, T₁ = 24.2 ºC
T₁ = 24.2 + 273 = 297.2 K
The final temperature of the gas, T₂ = 8.3ºC
T₂ = 8.3 ºC + 273 = 281.3 K
Given, the initial volume of gas, V₁ = 69.0 μL then the final volume of the gas can be determined as:
Put the value of V₁, T₁, and T₂ in equation (1), and we get:
[tex]\frac{69}{297.2} =\frac{V_2}{281.3}[/tex]
[tex]V_2=\frac{69\times 281.3}{297.2}[/tex]
V₂ = 65.31 μL
Therefore, the volume of the gas was equal to 65.31 μL at a temperature of 8.3ºC. The volume of the gas will decrease when the final temperature is lowered as the pressure remains constant.
Learn more about Charles's law, here
brainly.com/question/16927784
#SPJ5
9. Mr. James owns 12 gas stations in Newport News. He wants to build a
new gas station on the same block that already has a gas station. There
are 3 other different gas stations near by. He thinks it will allow the
community to have a choice as to which gas to use. What type of
viewpoint does Mr. James have? *
preservationist viewpoint
conservationist viewpoint
developmental viewpoint
Mr. James holds a developmental viewpoint. This perspective prioritizes progress, growth, and expansion, often with a focus on economic development and maximizing opportunities for growth and profit.
In Mr. James' case, his decision to build a new gas station in an area already serviced by existing gas stations reflects a desire for development and expansion of his business ventures. He sees the construction of a new gas station as a means to increase accessibility and choice for the community, potentially attracting more customers and generating additional revenue.
From a developmental viewpoint, Mr. James likely perceives the addition of a new gas station as beneficial for the community, offering consumers more options and fostering competition among gas providers. He may believe that competition will lead to better services, lower prices, and improved overall customer satisfaction.
Additionally, Mr. James may view the construction of a new gas station as a way to contribute to the economic growth and development of the area. The establishment of new businesses can create job opportunities, stimulate local economies, and contribute to the overall prosperity of the community.
However, it's important to note that while the developmental viewpoint emphasizes progress and growth, it may not always prioritize environmental or conservation concerns. In Mr. James' case, the decision to build a new gas station may have implications for environmental sustainability, such as increased pollution or depletion of natural resources, which are factors that conservationists may be more inclined to consider.
Overall, Mr. James' decision to build a new gas station reflects a developmental viewpoint focused on growth, expansion, and economic development, with the belief that it will benefit both his business and the community at large.
how many atoms of lead are there in 10.0 g of lead?
Answer:
The number of atoms in 10 g of Pb is 2.9064 × 10²² atoms
Explanation:
According to Avogadro's constant, one mole of a substance contains exactly 6.02214076 × 10²³ particles such as molecules, atoms or ions.
Here we have lead, Pb, which is an uncombined element, therefore, the number of moles present in 10 g of lead can be found as follows;
Molar mass of lead = 207.2 g/mol
Mass of lead sample = 10 g
[tex]Number \, of \, moles, \, n, \, of \, lead \, present = \frac{Mass \, of \, lead}{Molar \, mass \, of \, lead} = \frac{10 \, g}{207.2 \, g/mol} = 0.04826 \ moles[/tex]
Therefore, number of atoms in 10 g of lead is found by multiplying the number of moles by the Avogadro's number as follows;
Number of atoms = Number of moles × Avogadro's number
∴ Number of atoms in 10 g of Pb = 0.04826 × 6.02214076 × 10²³ = 2.9064 × 10²² atoms.
The number of atoms in 10 g of Pb = 2.9064 × 10²² atoms.
Answer:
2.9 ×10^22 atoms of lead.
Explanation:
Now, we have to make use of the Avogadro's number. Remember that according to professor Avogadro, the mole refers to the amount of substance that contains the same number of elementary entities as 12 grams of carbon-12.
The number of elementary particles (atoms, ions, molecules etc) present is one mole of a substance is equal to the Avogadro's number. Hence one mole of a substance contains Avogadro's number of elementary entities.
Now one mole of lead has a mass of 207.2 gmol-1. One mole of lead contains 6.02×10^23 atoms (Avogadro's number) of atoms.
Hence if 207.2 g of lead contains 6.02×10^23 atoms of lead
10.0 g of lead will contain 10.0 × 6.02×10^23 / 207.2 = 2.9 ×10^22 atoms of lead.
Hence 10.0g of lead contains 2.9 ×10^22 atoms of lead.
if the base concentration was 3.0 M, determine the unknown concentration of the sulfuric acid. please answer asap !!!!
Answer:
The concentration of sulfuric acid would be 3.6 M.
Explanation:
If you make a solution that has a H+ concentration of 0.075, what
will the pH of the solution be?
Answer:
1.125
Explanation:
pH = -log[H+]
pH = -log(0.075)
pH = 1.125
Which condition causes a hurricane to rotate?
Answer:
its caused by the convection of air masses with differences in densities mainly due to their differences in temperatures.
-Hops
Identify whether the statement is true or false, and why? “Global temperatures have risen in the past, the reason they are dangerous now is because of how fast the change is happening.”
A. False, it should read “Global temperatures have risen in the past, so there is no danger that they are rising now.”
B. False, it should read “Global temperatures have risen in the past, the reason they are dangerous now is because of how slowly the change is happening.”
C. False, it should read “Global temperatures have not risen in the past, so it is very dangerous that this change is happening.”
D. True
Answer:
c
Explanation:
False, it should read “Global temperatures have not risen in the past, so it is very dangerous that this change is happening.” Hence, option C is correct.
What are global temperatures?Global warming is defined in this report as an increase in combined surface air and sea surface temperatures averaged over the globe and over a 30-year period.
Though natural cycles and fluctuations have caused the earth's climate to change several times over the last 800,000 years, our current era of global warming is directly attributable to human activity—specifically to our burning of fossil fuels such as coal, oil, gasoline, and natural gas
Hence, option C is correct.
Learn more about Global temperatures here:
https://brainly.com/question/5995940
#SPJ2
150 units of chemical energy were converted into 35 units of thermal energy, 5 units of sound energy,
and x units of radiant energy. What is the value of x?
A. 190
OB. 40
O
C.
110
O
D.
100
Answer:
110
Explanation:
difference between exothermic chemical reaction and endothermic chemical reaction
Explanation:
exothermic reaction is a chemical reaction which involves the liberation of heat to the surroundings while endothermic reaction is a chemical reaction that involves the absorption of heat from the surroundings
Answer:
Exothermic= outside
Endothermic= inside
Explanation:
What is the molarity of the solution produced when 85.6 g of hydrochloric acid (HCl) is dissolved in enough water to prepare 385 mL of solution?
Answer:
6.09 M
Explanation:
M(HCl) = 1 +35.5 = 36.5 g/mol
85.6 g * 1 mol/36.5 g = 2.3452 mol HCl
Molarity = mol solute/ L solution = 2.3452 mol/0.385 L = 6.09 mol/L =6.09 M
The number of moles of HCl in 85.6 g is 2.35 moles. Then, the molarity of the 385 ml or 0.385 L solution is 6.10 M
What is molarity ?The molarity of a solution is the ratio of the number of moles of its solutes to the volume of solution in liters. It is the common term to express the concentration of a solution.
To find the molarity of the solution, we need to first calculate the number of moles of HCl in the solution, using the formula:
moles = mass / molar mass
where mass is the mass of the solute (hydrochloric acid) and molar mass is the molecular weight of the solute.
The molecular weight of HCl is approximately 36.5 g/mol (1.008 g/mol for hydrogen and 35.5 g/mol for chlorine).
So, the number of moles of HCl in 85.6 g of HCl is:
moles = 85.6 g / 36.5 g/mol = 2.35 mol
Next, we need to calculate the volume of the solution in liters:
385 mL = 0.385 L
Finally, we can calculate the molarity of the solution using the formula:
molarity = moles of solute / liters of solution
molarity = 2.35 mol / 0.385 L ≈ 6.10 M
Therefore, the molarity of the solution produced is approximately 6.10 M.
Find more on molarity :
https://brainly.com/question/8732513
#SPJ3
The only positive ion found in H2SO4(aq) is the
(1) ammonium ion (3) hydroxide ion
(2) hydronium ion (4) sulfate ion
Final answer:
The positive ion found in aqueous sulfuric acid (H2SO4) is the hydronium ion (H3O+), which forms during the acid's ionization in water.
Explanation:
The positive ion found in H2SO4(aq) is the hydronium ion (H3O+). When sulfuric acid (H2SO4) is dissolved in water, the first ionization results in the formation of hydronium ions (H3O+) and hydrogen sulfate ions (HSO4−). The second ionization of the hydrogen sulfate ion can produce more hydronium ions and sulfate ions (SO42−). Since we are discussing only positive ions, the hydronium ion is the relevant ion in both ionization steps of sulfuric acid in an aqueous solution.
The ammonium ion (NH4+), sulfide ion (S2−), and hydroxide ion (OH−) are not relevant in the context of sulfuric acid in aqueous solution.
In aqueous sulfuric acid, the only positive ion present is the 2. hydronium ion (H₃O⁺).
In the aqueous solution of sulfuric acid, H₂SO₄(aq), the only positive ion that is found is the hydronium ion (H₃O⁺).
When sulfuric acid (H₂SO₄) is dissolved in water, it undergoes ionization:
First ionization: H₂SO₄(aq) + H₂O(l) ⇒ H₃O+(aq) + HSO₄⁻(aq)
Second ionization: HSO₄⁻(aq) + H₂O(l) ⇒ H₃O⁺(aq) + SO₄²⁻(aq)
This ionization process results in the formation of hydronium ions (H₃O⁺), making them the only positive ions in the solution. The correct answer is 2.