The excretory system words with the respiratory system to remove carbon dioxide.
It works with the respiratory system because it helps the lungs get rid of carbon dioxide and water vapors.
Hope this helps,
Davinia.
what is a stationary front?
A) A high pressure system equally matched to a low pressure system and not moving
B) High pressure system overtaking a low pressure system
C) Low pressure system overtaking a high pressure system
D) None of the above
None Of the Above
Is the answer
Hope this helped plz mark
Hi There!
Question - What is a stationary front?
Answer - None of the above.
Why - The reason I say this because in a stationary front its made of low pressure systems so its not A or B. The wind blows the low pressure system which cause precipitation. If its not D then is C.
Hope This Helps :)
Due to radioactive decay over many millions of years, it is possible for the element uranium to decay in
The uranium within these items is radioactive and should be treated with care. Uranium's most stable isotope, uranium-238, has a half-life of about 4,468,000,000 years. It decays into thorium-234 through alpha decay or decays through spontaneous fission.
Neptune is 30.6 au from the sun. How long is the year for neptune?
a) P^2=a^3=30.6^3=28650
b) P=28650=169 years
Final answer:
Neptune takes approximately 165 Earth years to complete one orbit around the sun, as it orbits at a distance of 30 AU from the sun.
Explanation:
The orbital period of Neptune, which is the time it takes for Neptune to complete one orbit around the sun, is approximately 165 Earth years. This is because Neptune orbits at an average distance of 30 astronomical units (AU) from the sun. One AU is the average distance between the Earth and the Sun, which is about 1.496×108 km. Given that Neptune is 4.490×109 km away from the Sun, and considering the substantial distance as compared to Earth's orbit, Neptune's year is much longer.
How does weathering change rock and minerals
Weathering is the process of breaking large rocks and boulders into much smaller ones. Weathering can be brought about by wind and water mostly. Sometimes even biological forces account for some types of weathering.
The more the particles an object has at a given temperature, the more thermal energy it has. True or false
This is im 90% sure false because if an object is bigger it doesnt mean that its temperature is higher :)
calculate the hydroxide ion concentration [OH-] for a solution with a pH of 6.10
There are different formula you need to keep in mind when solving for [OH-]
Given that pH = 6.10
pH + pOH = 14
6.10 + pOH = 14
pOH = 7.9
[OH-] = 10^(-pOH)
[OH-] = 10^(-7.9)
[OH-] = 0.000000013
[OH-] = 1.3 x 10^-8
The hydroxide ion concentration in an aqueous solution is equal to 10⁻⁸M.
What is the pOH?pOH can be determined by taking the negative logarithm of the hydroxide ions concentration in the given aqueous solution.
Mathematically, pOH can be expressed in the form of hydroxide ion concentration as follows:
pOH = - log [ OH⁻]
and, [tex]pH + pOH = 14[/tex] ..............(1)
where [OH⁻] is the hydroxide ions concentration present in an aqueous solution.
Given, the value of pH of the solution containing hydroxide ions:
pH = 6.10
Substitute the value of the pH in equation (1):
pH - log [OH⁻] = 14
6.10 - log [OH⁻] = 14
log [OH⁻] = - 7.9
[OH⁻] = [tex]10 ^{-7.9}[/tex]
[OH⁻] ≈ 10⁻⁸ M
Therefore, the concentration of the hydroxide ions in an aqueous solution is equal to 10⁻⁸ M.
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The type of decay associated with the emission of a photon is
Gamma Decay in the nucleus is similar to Photon Decay in atoms. When a electron charges energy levels in the atoms, it desposes of photon (with energy of order electron volts).
A sulfur atom has a mass number of 31, 16 protons, 15 protons, and 18 electrons. What is the charge of this atom
Answer:
It should be -2; like hydrogen sulfide H2S
Explanation:
How do you find out how many protons,electrons, and neutrons an atom has?
An atom's atomic number equals the number of protons and in a neutral atom, also, the number of electrons. The mass number equals the total number of protons and neutrons. Subtracting the atomic number from the mass number gives the number of neutrons.
Explanation:
In order to determine the number of protons, neutrons, and electrons an atom has, you need to understand the key terms: atomic number and mass number. The atomic number of an element represents the number of protons in an atom and, in a neutral atom, this also equals the number of electrons. The mass number (or atomic mass) is the total amount of protons and neutrons in an atom. To find out the number of neutrons in an atom, you subtract the atomic number from the mass number. Hence, if the atomic number (Z) represents the number of protons and the mass number (A) represents the number of protons plus neutrons, the formula A - Z = number of neutrons can be used to find the number of neutrons in an atom.
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Which pair of atoms is most likely to be covalently bonded?
1) Na and O
2) K and F
3) Ne and O
4) C and S
1 and 2 are a metal - nonmetal pair - that kinda means ionic bond. Na and F are going to lose electrons.
3 [Nonmetals bond to each other covalently! Ne and O are nonmetals. O would need 2e to become stable. Either getting 2e (ionic bond) or sharing 2e (with H, for example). However, Ne is a noble gas, which means it is already doing fine with its 8e on its valence shell and isn't gonna share 2e of its electrons with O. So, despite the fact that they are both nonmetals, they won't form a covalent bond.
Sum up: they are 2 gases haha, and one of them is a noble one. They will never bond to each other covalently
4 - C and S - right answer
As they are both nonmetals (nonmetals bond to each other covalently, none of them is a noble gas, and so on)
How many grams of lead ii sulfide is produced when 25.0 g lead ii acetate reacts with excess hydrogen sulfide
Answer: 18.42 grams of lead (II) sulfide will be produced in the given reaction:
Explanation: The reaction of lead (II) acetate and hydrogen sulfide follows:
[tex](CH_3COO)_2Pb+H_2S\rightarrow PbS+2CH_3COOH[/tex]
To calculate the moles, we use the formula:
[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ....(1)
Molar mass of lead (II) acetate = 325.29 g/mol
Given mass of lead (II) acetate = 25 g
Putting values in above equation, we get:
[tex]Moles=\frac{25g}{325.29g/mol}=0.0768moles[/tex]
We are given that hydrogen sulfide is present in excess, so limiting reagent is lead (II) acetate because it limits the formation of product.
By stoichiometry of the reaction,
1 moles of lead (II) acetate produces 1 mole of lead (II) sulfide
So, 0.0768 moles of lead (II) acetate will produce = [tex]\frac{1}{1}\times 0.0768[/tex] = 0.0768 moles of lead (II) sulfide.
Now, to calculate the mass of lead (II) sulfide, we use equation 1, we get:
Molar mass of lead (II) sulfide = 239.3 g/mol
[tex]0.0768mol=\frac{\text{Given mass}}{239.3g/mol}[/tex]
[tex]\text{Mass of lead (II) sulfide}=18.42g[/tex]
When 25.0 g of lead (II) acetate reacts with excess hydrogen sulfide, 18.37 grams of lead (II) sulfide are produced, based on stoichiometry and molar mass calculations.
To calculate the number of grams of lead (II) sulfide produced when 25.0 g of lead (II) acetate reacts with excess hydrogen sulfide, first, you need to write the balanced chemical equation for the reaction:
Pb(C₂H₃O₂)₂+ H2S ightarrow PbS + 2C₂H₄O₂
This indicates that one mole of lead (II) acetate produces one mole of lead (II) sulfide. Next, find the molar mass of lead (II) acetate and lead (II) sulfide:
Molar mass of Pb(C₂H₃O₂)₂ = 325.29 g/mol
Molar mass of PbS = 239.26 g/mol
Then, calculate the number of moles of lead (II) acetate:
25.0 g Pb(C₂H₃O₂)₂ times (1 mol / 325.29 g) = 0.0768 mol
Assuming complete reaction and that lead (II) acetate is the limiting reagent, the same number of moles of PbS will be formed. Finally, calculate the mass of PbS:
0.0768 mol PbS times (239.26 g/mol) = 18.37 g of PbS
Therefore, 18.37 grams of lead (II) sulfide are produced.
When Calcium (Ca) is mixed with Hydrochloric acid (HCI), a single-displacement reaction occurs. What will be the product or products?
a) CaCI2
b) CaCI2+H2
c) Ca+HCI
d) CI and H
Answer: The correct answer is Option b.
Explanation:
Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element from its chemical reaction.
The reactivity of metal is determined by a series known as reactivity series. The metals lying above in the series are more reactive than the metals which lie below in the series.
When calcium metal reacts with hydrochloric acid, it leads to the formation of a salt known as calcium chloride and also releases hydrogen gas.
The chemical equation for the above reaction follows:
[tex]Ca(s)+2HCl(aq.)\rightarrow CaCl_2(s)+H_2(g)[/tex]
Hence, the correct answer is Option b.
If an object starts at rest and moves 16 m north along a straight line for two seconds what is its average velocity
The answer would be 8 m/s. To find the answer you divide distance by time which is 16 divided by 2.
A known compound contains two atoms of sulfur into atoms of oxygen write the name and formula of this compound
S+O2 =SO2 SULFUR DENOTE S
TWO ATOM OF OXYGEN DENOTE O2
When you push downward on Earth to make a pole vault, does Earth exert an equal source on the pole?
Scientific theories are explanations for naturally occurring events or phenomena. Although scientific theories require extensive observations and experimentation, they can change over time as new evidence is discovered. Scientific laws are principles that are also based on extensive observations and experimentation. Although scientific theories can develop into laws, a theory can only be declared a law if it is proven to be without exception under certain stated conditions. Which of the following is true regarding scientific theories,laws, and knowledge?
A.
New scientific knowledge is gained by memorizing scientific theories and laws.
B.
Scientific theories can lead to scientific knowledge, but scientific theories are not related to scientific knowledge.
C.
Scientific knowledge must be proven by both scientific theories and laws.
D.
Scientific theories and laws develop from the acquisition of scientific knowledge.
Answer: D. Scientific theories and laws develop from the acquisition of scientific knowledge.
Explanation:
The scientific knowledge is acquired by using the detail knowledge of scientific methodology which is used in both scientific theories and laws. The scientific methodology includes the observing things, making hypothesis on the basis of observation, testing the hypothesis, performing the experiment and concluding the results. The results obtain will contribute to new innovation and research which will further contribute to the scientific knowledge.
which of the following atoms would be most likely to have an unstable nucleus?
3
is the answer i do believe
How is Earth's surface most likely to change as water freezes and expands on a mountain side over time?
A.) Erosion will cause the ice to crack the rock.
B.) Physical weathering will cause the ice to crack the rock.
C.) Deposition will cause the water to break the rock into sediment.
D.) Chemical weathering will cause the water to dissolve the rock.
B. Physical weathering will cause the ice to crack the rock.
Answer:
The correct answer is B.
Explanation:
The Earth's surface as water freezes and expands on a mountain slope will cause ice to break the rock. This occurs because the ice occupies a larger volume than the liquid, so it displaces the rock and causes it to break. When the water that accumulates in the rocks freezes, its volume increases in solid-state and exerts a greater pressure, enough to break the rock.
Have a nice day!
Fullerene is a perfect sphere with the chemical formula c60. From this information, what you can deduce about the structure of fullerenes?
1. It only contains one elements
2. It is a compound of 60elements
3. It is a mixture of 60 atoms
4. It is a mixture of 60 elements
Answer:
1. It contains only one element.
Step-by-step explanation:
The formula of fullerene is C₆₀.
Fullerene is a compound. One molecule of fullerene contains 60 atoms of one element, carbon.
2. is wrong, because fullerene consists of only one element.
3. and 4. are wrong, because fullerene is a compound.
Which of the following is most clearly an example of a physical change?
A. A solid dissolves when added to a liquid
B. A solution color when something is added
C. Two liquids produce heat when mixed together
D. A gas is released when two solutions are combined
Answer: Option (A) is the correct answer.
Explanation:
Physical change is defined as a change that does not bring any changes in the chemical properties of a substance.
For example, solubility, density, volume etc are all physical changes.
When sugar dissolves in water then it is a physical change.
Whereas color change may not necessarily shows a physical change because a chemical change can also lead to color change of a solution or substance.
For example, rusting of iron is a chemical reaction in which color change also occurs.
Hence, we can conclude that a solid dissolves when added to a liquid is most clearly an example of a physical change.
At what time should we definitely seek shade to avoid sun exposure?
A:Between 6 a.m. and 8 a.m.
B:Between 8 a.m. and 10 a.m.
C:Between 10 a.m. and 4 p.m.
D:Between 4 p.m. and 10 p.m.
Couldn't find Science in the "Pick a subject" box ;-;
We should definitely seek shade to sun exposure between 10 A.M. and 4 P.M.
Hope this helped!
How many electrons does (Al) have to give up to achieve a noble gas?
Aluminium has 3 valance electrons in its outer shell. This means that it would need to give up 3 electrons to achieve a full octet.
The muscular system and the nervous system work together by
Muscles protect the network of nerves that run throughout the body
Answer:
Muscles protect the network of nerves that run throughout the body
Explanation:
I thank to
Name the isotope used as a fuel and give its symbol , including nucleon number.
fast please
The isotope which is used as fuel in nuclear power generators is uranium - 235. THe nuclear symbol is [tex]\rm_{92}^{235}U[/tex].
What are isotopes?Isotopes are atoms of same element with different mass number. They may differ in the physical and chemical properties also. Not all isotopes of an atom are stable. Some of them are radioactive and are unstable.
Uranium is 92nd element in periodic table. It is a radioactive element placed in among the actinides in f- block elements. Uranium undergo alpha or beta decay producing more stable nuclei with different composition.
Nuclear decay evolves energy and thus radioactive elements such as U are used as fuel in power generation plants.
An isotope is represented by the chemical symbol with the atomic number as subscript and mass number as superscript.The isotopic symbol of U is [tex]\rm_{92}^{235}U[/tex]. The mass number is 235. and the number of protons and neutrons are 92 and 143 respectively.
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Why does food wrapped in aluminum foil keep warm for a long time? A) Aluminum foil is an insulator and prevents heat loss by conduction. B) Aluminum foil forms an air-tight seal and prevents heat loss by convection. C) The silver surface of the foil reflects heat in and prevents heat loss by radiation. D) The silver surface of the foil absorbs heat from the surroundings and keeps the food warm.
The answer is A or D
the correct answer is c.
(02.01 LC)
What type of relationship exists between two organisms if both of them benefit from the relationship? (4 points)
Commensalism
Competition
Mutualism
Parasitism
When uranium-238 is transformed into thorium-234, it is represented by a balanced equation. What is missing from the equation of U-238 undergoing radioactive decay?
The unstable atomic nucleus of Uranium-238 emits ionizing particles and loses energy in order to achieve a stable state. This process is called the Radioactive decay. This isotope undergoes Alpha decay by emitting Alpha rays. It has a decay energy of 4.267 MeV.
Final answer:
The decay of uranium-238 to thorium-234 is represented by a nuclear equation that must balance in terms of both mass numbers and atomic numbers, owing to conservation laws. The emission of an alpha particle during the decay of U-238 results in Th-234, with the mass number decreasing by 4 and the atomic number by 2.
Explanation:
When uranium-238 decays to form thorium-234, this is represented by a nuclear equation owing to the transformation occurring within an atomic nucleus. According to conservation of mass and atomic numbers, the nuclear equation must balance, both in terms of the mass numbers and the atomic numbers. Considering uranium has an atomic number of 92 (Z = 92) and a mass number of 238, when it loses 2 protons and 2 neutrons which occurs during the emission of an alpha particle (He), we are left with thorium-234 (Th).
The balanced nuclear equation for this decay process is:
^238_92U → ^4_2He + ^234_90Th
This shows the loss of an alpha particle from uranium-238 which results in thorium-234. The sum of the mass numbers and atomic numbers on the reactant side must equal the sum on the product side, hence confirming that the equation is correctly balanced. The loss of four nuclear particles (2 protons and 2 neutrons) is accounted for by the alpha particle, reducing the mass number by 4 from 238 to 234, and dropping the atomic number from 92 to 90 which identifies the new element as thorium. Furthermore, this decay sequence continues as thorium-234 decays via beta emission to form protactinium-234, which then decays to uranium-234.
why is bronze preferred in making statue
The percentage composition of oxygen in the compound Ca(ClO3)2 is approximately
assume you have 1 mole (or any other number, it doesn't matter). Mass = 206.98 g/mole. This is straight from the molar mass so that's why I like to use 1 mole
From the chemical formula, 1 mole of Ca(ClO3)2 contains 6 moles of oxygen atoms.
Mass of 6 moles of O atoms = 6 moles * 16 g/mole = 96 g
mass % oxygen = 96 g / 206.98 g * 100 = 46.4%.
You could also do it on a mole percent. 1 mole of Ca(ClO3)2 contains 9 moles of atoms.
6 moles of these are oxygen atoms so the mole % = 6 moles / 9 moles * 100 = 66.7 mole %
If you mean percent by weight or percent by composition? Ca(ClO3)2 is 67% O by composition (number of atoms) and, as calculated by Ricki, 46% by weight.
The percentage composition of oxygen in the compound Ca(ClO₃)₂is approximately is 46.38%.
What is percent composition?Percent composition is defined as a convenient way to record concentration of solution.It is a expression which relates one element to compound as,mass of element/mass of compound ×100.Percent compositions helps in determination of amount of an element which is present in the compound.
Percent composition of a compound or an element is usually in terms of grams of an element or a compound.
In the given example, molar mass of calcium chlorate is 206.98 g/mole and that oxygen present in it is 96 g/mol,substituting these values in above formula we have, 206.98/96×100=46.38 %
Thus, the percentage composition of oxygen in the compound Ca(ClO₃)₂is approximately is 46.38%.
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Match the bond to its formula
1. ionic NaCl
2. covalent CO2
3.metallic ZnCu