Explanation:
Cr=35.880/51=0.73≈0.7
P=21.076/31=0.67≈0.7
O=43.543/16=2.71
Divide each by 0.7 u get
Cr=1 ,P =1, O=4
Empirical formula is CrPO4
5. What percentage of energy generation is
produced by fossil fuels? sc.7.P.11.2
A 19.5%
B 33.2%
© 66.9%
D 86.4%
Answer:
i think it's B maybe..I'm not sure
(Hurry ASAP!!!) There are 1.5 moles of methane (CH4) in a tank. It has a pressure of 4.4 atm at 173°C. Find the volume occupied by the gas.
Answer:
hope this help !
Explanation:
Use the given functions to set up and simplify 173 ° C .
1.5 =
CH4 = CH4
4.4 = CH4
173 ° C = CH4
Pls help with this “can get 16 points!”
Explanation:
I believe mitosis is the answer
please mark me brainliest
The graph above represents an object moving with a __________________. A) constant velocity B) constant acceleration C) constant positive acceleration D) constant negative acceleration
Answer: I think its C or B
Explanation: Hope this was helpful....
What determines how many electrons an atom will gain, lose, or share when it forms a chemical bond?
Answer:
To be stable an atom will gain, lose, or share electrons to complete the outer most energy level (electron shell). Octet Rule because levels 2 and 3 need 8 electrons to be stable.
What distinguishes an element from all other elements
Answer:
Elements are distinguished from one another by their atomic numbers. No two elements have the same atomic number. It is the atomic number, and therefore the number of protons in its atomic nuclei, that define an element.
4. Biotic factors that affect other organisms in an ecosystem include all but which of the following factors? a. Symbiosis b. Predation C. Volcanic eruptions d. Competition
I think its d but im not sure
Answer:
Below
Explanation:
The answer is C, because ecosystems include:
Competition
Predation
Consumption
Parasitism
Disease
Symbiosis
I need an answer and explanation pls
Answer:
Cl2 + 2NaBr --> 2NaCl + Br2
Explanation:
This is a single displacement reaction where one side of the ionic compound switches with the other.
So, Cl2 + NaBr ---> NaCl + Br2
This isolates the Bromine and puts the Chlorine in it's place.
Then, balance out the equation like so and you should get
Cl2 + 2NaBr --> 2NaCl + Br2
Which one has a larger atomic radius cobalt or nickel
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, cobalt has larger atomic radius than nickel.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
On going down the group of periodic table size increases due to increase in number of shells, on going from left to right in a period the size decreases because of increase in effective nuclear charge. Cobalt or nickel comes in the same period, cobalt comes first to nickel. Cobalt has larger atomic radius than nickel. Ni and Co belongs to d block.
Therefore, cobalt has larger atomic radius than nickel.
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An inflated balloon is left outside overnight. initially it has a volume of 1.84 L when the temperature is 293.4 K and the pressure. what temperature will the balloon have a volume of 1540mL. If the pressure falls to 14.41 psi?
Answer:
ffff
Explanation:
which place is a likely location for primary succession
Answer:
Places where primary succession occurs
include newly exposed rock areas, sand dunes, and
lava flows.
Sweat and releasing thermal energy from blood vessels are ways the skin helps control body temperature. Group of answer choices False True
memeemme eemmememmememmemmeemmeemememmemmemememmee Explanation:
please help hehehheh
Answer: C is the definete awnser so yeah its just a lol of REHEHEHEHHEHEHEHEHEHEHEHEHEHEHHEHEHEHEHEHEHEHEHHEHEHEHEHHEHEHEHEHEHEHEHEHHEHEHEHEHEHEHEHEHEHEHEHHE
Please help me with 6 7 8 and don’t send me a link tell me here please
Answer:
6 b physical properties
7b melting point
8 boiling
What does replacement mean?
Answer: Replacement means a person or thing that takes the place of another; a substitute.
What are most semiconductors made from? iron copper aluminum silicon
Answer:
silicon
Explanation:
Silicon is at a higher level than germanium, tin, and lead.
Most semiconductors are made up of silicon. Thus, the correct option for this question is D.
What are semiconductors?A Semiconductor may be defined as a type of solid substance that possesses an electrical conductivity between that of an insulator and a conductor. It has a specific electrical property that allows it to function as a foundation for computers and other electronic devices.
Silicon is the most widely utilized in the manufacturing of semiconductors. Apart from this, germanium, gallium, and arsenide are also used. Among all these elements, germanium was one of the earliest semiconductors material used.
Semiconductors are widely used in the production of Integrated circuits (ICs) and electronic discrete components such as diodes and transistors.
Therefore, most semiconductors are made up of silicon. Thus, the correct option for this question is D.
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If there is no subscript on an element symbol there is/are __________________ atom(s) of that element.
Answer:
If there is no subscript written after a symbol that means there is one atom of that element present
Explanation:
correct me if I'm
If there is no subscript on an element's chemical symbol there is one atom of that element.
What is an element ?
It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.Elements combine to form compounds.
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Which compound is insoluble in water?
A) calcium bromide
B) potassium bromide
C) silver bromide
D) sodium bromide
Answer:
C) silver bromide
Explanation:
Calcium bromide is incorrect.
The compound which is insoluble in water is silver bromide (AgBr).
Which compounds are insoluble in water?Those compounds which have high attraction force between their constitutes ions as compare to ions between the water and compounds are insoluble in water.
Among given compounds all are soluble in water except silver bromide, because silver is having high nuclear charge than other given alkali metals as calcium, potassium and sodium. So it tightly attracts the bromide ion towards itself and this attraction is more than the attraction between the H⁺ ion of water and bromide ion, as a result of which it is insoluble in water.
Hence, option (C) is correct i.e. silver bromide.
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When sediment is eroded and then deposited at the mouth of a river, it can form a
Answer:
fossil?..................
How can the speed of solvent molecules be slowed down?
A. by increasing the temperature
B. by increasing the surface area of the solute
C. by increasing the pressure
D. by decreasing the temperature
E. by decreasing the surface area of the solute
A. by increasing the temperature
B. by increasing the surface area of the solute
C. by increasing the pressure
D. by decreasing the temperature
E. by decreasing the surface area of the solute
Concentrated hydrochloric acid is 12.0 M. What volume of this concentrated
solution would be needed to mix with water to produce 100. mL of 5.0 M. (Hint: the
number of moles in the diluted solution must be the same as the number of moles
from the concentrated solution.)
Answer:
41.67 ml HCl
Explanation:
n = M x V
Since the number of moles is the same:
M1 x V1 = M2 x V2
V1 = M2 x V2 /M1 =(0.1 L x 5.0 M) / 12.0 M = 0.041667 L = 41.67 ml
What 2 subatomic particles are found in the nucleus?
Answer:
Protons and Neutrons
Explanation:
Thats it
How many atoms are in 9.3moles of lithium?
Answer:
3.45 moles Li contains 2.08 × 10 (to the power of)24 atoms .
Explanation:
The relationship between atoms and moles is:
1 mole atoms =
6.022 × 10 (to the power of)23
atoms
In order to determine how many atoms occupy a given number of moles, multiply the given moles by
6.022 × 10 (to the power of)23
atoms/mole
.
In the case of 3.45 moles lithium (Li):
3.45 mol Li × 6.022 × 10 (to the power of)23 atoms Li/ 1 mol Li =
2.08 × 10 (to the power of)24
atoms Li rounded to three
Answer: 3.45 moles Li contains 2.08 × 10 (to the power of)24 atoms
Explanation:
CaCO3(s)⇄CaO(s)+CO2(g) When heated strongly, solid calcium carbonate decomposes to produce solid calcium oxide and carbon dioxide gas, as represented by the equation above. A 2.0mol sample of CaCO3(s) is placed in a rigid 100.L reaction vessel from which all the air has been evacuated. The vessel is heated to 898°C at which time the pressure of CO2(g) in the vessel is constant at 1.00atm , while some CaCO3(s) remains in the vessel. (a) Calculate the number of moles of CO2(g) present in the vessel at equilibrium. (b) Write the expression for Kp, the equilibrium constant for the reaction, and determine its value at 898C.
A) The number of moles of CO₂(g) present in the vessel at equilibrium is; 1.04 moles
B) The expression for Kp, the equilibrium constant for the reaction, and its value at 898°C is; Kp = (P[CO₂] * P[CaO])/(P[CaCO₃]) and Kp = 0.0104 mol/L
How to Calculate Equilibrium Constant
We are given the reaction equation as;
CaCO₃ (s) ⇄ CaO (s) + CO₂(g)
We are given;
Number of moles of CaCO₃ used = 2 mols
Volume of vessel; V = 100 L
Temperature; T = 898°C = 1171 K
Pressure of CO₂ in the vessel; P = 1 atm
A) Formula for number of moles of CO₂ in the vessel at equilibrium is;
n = PV/RT
where;
P is Pressure
V is Volume
R is gas constant = 0.08206 L·atm/mol·k
n = (1 * 100)/(0.08206 * 1171)
n = 1.04 moles of CO₂
B) Formula to find the equilibrium constant kp is;
Kp = (P[CO₂] * P[CaO])/(P[CaCO₃])
Where;
P[CO₂] is the partial pressure of CO₂
P[CaO] is the partial pressure of CaO
P[CaCO₃] is the partial pressure of CaCO₃
Since concentration of solids is taken as 1, then it means that;
Kp = P[CO₂]
Kp = 1.04/100
Kp = 0.0104 mol/L
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A student dissolves 1 gram of sugar in 10 grams of water. She then
determines the mass of the solution. What is the mass of the dissolved
sugar and water? PS1-5 DOK 1
more than 11 grams<>11 grams
Answer:
11 grams
Explanation:
your welcome!!!!!
Choose the answer that best explains why Orion is important to star watchers.
Orion is located on the celestial equator. Its location causes the rest of the stars to appear to revolve around Orion as the Earth rotates.
Since Orion can be seen in both the Southern and Northern Hemispheres it is useful for finding north in the night sky.
Orion, the hunter, was an important figure in Greek Mythology making the constellation of central importance to astronomers.
Orion is easy to locate, it can be seen in both hemispheres and is helpful for locating prominent stars, nebulas and surrounding constellations.
Answer:
Orion is located on the celestial equator. Its location causes the rest of the stars to appear to revolve around Orion as the Earth rotates.
Explanation:
The above stated statement is the reason why those who watches for stars commonly called the star watchers use the Orion as their base point in star observation. Without this, it would be difficult to trace the stars or know the exact ones which appears on the sky.
Under each DNA sequence write the complimentary mRNA base sequence that each of these gene fragments would produce. Remember that in the production of mRNA, the DNA base sequence "A" _________________ specifies the RNA base ____________________
Answer:
The correct answer would be -
Thymine to adenine
Cytosine to guanine
guanine to cytosine
Adenine, and "U" uracil respectively.
Explanation:
mRNA is a sequence of complementary base sequences encoded from a gene or DNA segment which is used to produce the protein by the process called translation.
From converting a sequence from DNA to its complementary mRNA sequence, the rules of complementary base pairing will be applied: Cytosine (C) is replaced with Guanine (G) – and vice versa. Uracil (U) is replaced by Adenine (A) and Thymine is replaced by adenine.
Please help! How many grams is 4.5 x 10^27
Answer: The answer is 4.5e+27 grams, I hope I helped!
Explanation: N/A (I threw away my paper ^^")
Why are we pulled to the center of the Earth and not into the much larger sun?
Answer:
The sun's gravity pulls on the earth, and the earth pulls back on the sun at the same time. This is why the center of the solar system is not the center of the sun. As one gravitational body gets bigger than the other, it circles closer to the center of the system (shown in red).
Explanation:
hope this helps...
The earth is known to be falling towards the sun as a result of intense gravity. The earth is known to have plenty of sideways momentum and due to this sideways momentum, the earth is often falling towards the sun and missing it.
The reason we are pulled to the center of the Earth and not into the much larger sun by gravity is that all objects with mass, like our Earth, do bend and curve the fabric of the universe referred to as spacetime.
At most, the gravity from the sun result in our planet moving in a curved, elliptical path. but, the planets are moving fast enough so that they are not pulled into the sun.
The sun has a more weaker gravity and as it loses mass, it causes the Earth to slowly move away from it.
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How is an ion formed