help me out with my homework
Answer:
3) The salivary glands present in the mouth produces saliva
what are the list of catalysts that can be used for hydrogenation of nitrobenzene???
Answer:
The multiring aromatic hydrocarbons in the coal liquid were hydrogenated to give saturated molecules that contained only one aromatic ring. Of the several organic bases investigated, potassium bis(trimethylsilyl)amide was found to be the most effective catalyst.
Explanation:
How many grams is 2.393 x 10^24 atoms of CI
70.45 g CI
140.9 ga
140.9 mole CI
70.45 mole CI
Answer:
There are 140.9 grams in 2.393*10²⁴ aotms of Cl.
Explanation:
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression. Avogadro's number applies to any substance.
Then you can apply the following rule of three: if 6.023*10²³ atoms are contained in 1 mole of the compound, 2.393*10²⁴ atoms are contained in how many moles?
[tex]amount of moles=\frac{2.393*10^{24} *1 mole}{6.023*10^{23} }[/tex]
amount of moles= 3.973
If the molar mass of Cl is 35.453 [tex]\frac{g}{mole}[/tex], then the amount of mass that contains 3.973 moles can be calculated as:
3.973 moles*35.453 [tex]\frac{g}{mole}[/tex]= 140.85 grams ≅ 140.9 grams
There are 140.9 grams in 2.393*10²⁴ aotms of Cl.
5 *
1 point
Two elements are in the same group of the Periodic Table.
Which property will be the same for both elements?
A the charge on their ions
B their electronic structure
C their melting point
D their reactivity with water or acids
Answer:
A. the charge on their ions
Explanation:
Elements are grouped into the same group in the periodic table if they have the same valence electrons. However, the number of valence electrons an element has, determines the number of charges it can possess.
According to this question, two elements in the same group of the periodic table will have the same charge on their ions because they both have the same number of valence electrons.
4. What coefficients do you need to balance the following equation?
CH4 + O2 + CO2 + H2O
O 1, 2, 1, 2
O 2, 1, 1, 1
O 1, 1, 1, 1
O 2, 1, 2, 2
Answer:
option first is the right answer
someone help me with this problem pls
Answer:
magnetic field
Explanation:
If 1.00 L of gas at 1.00 atm of pressure is compressed to a volume of 0.473 L, what is the new pressure of the gas?
Answer:
2.11
Explanation:
1/0.473 = 2.11
¿Por qué crees que es importante conocer nuestra condición económica antes de practicar actividades físicas regularmente?
Answer:
el ejercicio físico ayuda a gente a perder peso y reduce el riesgo de desarrollar algunas enfermedades. el ejercicio físico regular el reducen los riesgos de ciertas enfermedades como obesidad, diabetes tipo 2 e hipertensión el ejercicio físico puede ayudar a mantener el cuerpo en un peso saludable pero a veces algunos tienen enfermedades al corazón o asma y les afecta a ser demasiado práctica esa actividad
what do you get if oceanic plates are moving away from one another
Answer:
Explanation:
When two plates are moving away from each other, they are called a divergent plate boundary.Along these boundaries, magma rises from deep within the Earth and erupts to form new crust on the lithosphere.
Helped by none other than the #Queen herself!
Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)
Starting with with 50.0 grams of Pb(NO3)2 and 30.0 grams of NaI:
A. What is the limiting reagent?
B. How many grams of the excess reactant remains?
C. How many grams of each product is formed?
D. If 12 grams of NaNO3 actually formed in the reaction, what is the percent yield of this reaction?
Answer:
Explanation:
Moles of Pb(NO3)2 = mass/molecular mass
= 50.0 grams/(207.20*1 + 14.01*2 + 16*6)
= 50.0 grams/331.22
= 0.15 moles
Moles of NaI
= 30/(22.99+126.9)
= 30/149.89
= 0.2 Moles
A. NaI is less 2x Pb(NO3)2 so NaI is the limiting reagent.
B. The ratio is 1 to 2 so there is 0.15 - 0.2/2 = 0.05 mole
or 16.78 grams of Pb(NO3)2 left.
C. As NaI is limiting, only 0.2 Moles of NaNO3 is formed.
Mass = Moles * Molecular Mass
Molecular Mass of NaNO3 can be calculated as:
Na - 22.99
N - 14.01
O - 3(16) = 48
23+14+48 = 85gram / mole
Thus, Mass = 0.2*85 = 17 gram of NaNO3
Mass is conserved in a chemical reaction.
Mass of PbI2 can be calculated as:
50+30-16.78-17
= 46.3 gram of PbI2
Mass =
12.75
Thus, 12.75g of Sodium Nitrate can be formed
Answer:
Explanation:
Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)
MM for each compound -
Pb(NO3): 207 + 14x2 + 16x3x2 = 331
PI2: 207 + 127x2 = 461
NaI: 23 + 127 = 150
NaNO3: 23 + 14 + 16x3 = 85
Moles of Pb(NO3)2 = 50/331 = 0.15
Moles of NaI = 30/150 = 0.2
Ratio of moles is 1:2
So NaI is limiting
Limited to 0.2/2 = 0.1 mole of Pb(NO3)2
Excess = 0.15 - 0.1 = 0.05 mole
Mass remains = 0.05x331 = 16.55 grams
Moles of NaNO3 formed = Moles of NaI reacted = 0.2
Mass = 0.2x85 = 17 grams
Moles of PbI2 formed = Moles of Pb(NO3)2 reacted = 0.1
Mass = 0.1x461 = 46.1 grams
If 12 grams of NaNO3 actually formed in the reaction,
percent yield = 12/17x100% = 70.6%
A ball is sitting at the top of a ramp. As the ball rolls down the ramp, the potential energy of the ball decreases. What happens to the potential energy as the ball moves
Answer:
it is converted to kinetic energy
can someone do this for me i wasent there when we learned it
If you want to make 174 grams of NiFz, how many moles of HF will you need, using
the following balanced chemical equation? Ni + 2 HF - NiF2 + H2
Answer:
3.6mol
Explanation:
The balanced chemical equation of this reaction is given as follows:
Ni + 2HF → NiF2 + H2
Based on the above equation, 2 moles of HF will react to produce 1 mole of NiF2.
According to this question, to make 174 grams of NiF2, we find the number of moles of HF required. However, we first convert the mass value of NiF2 to mole value using;
mole = mass/molar mass
Molar mass of NiF2 = 58.7 + 19(2)
= 58.7 + 38
= 96.7g/mol
mole = 174/96.7
mole = 1.799mol of NiF2
Hence, if 2 moles of HF will react to produce 1 mole of NiF2.
- 1.799mol of NiF2 will require (1.799 × 2) = 3.598
= 3.6mol of HF.
1. Who was the first person to create a periodic table? When?
2. What is the modern periodic table?
3. Compare and contrast the periods and groups of the modern periodic table.
4. In the modern periodic table (found in the back of your agenda), find the element named lead (Pb). How many protons do atoms of lead have? To which class of elements does lead belong?
5. Most of the elements on the periodic table belong to what class of elements.
6. Which groups of the modern periodic table contain elements that are classified as metalloids?
Answer:
Mendeleev discovered the periodic table (or Periodic System, as he called it) while attempting to organise the elements in February of 1869.
Explanation:
Mendeleev discovered the periodic table (or Periodic System, as he called it) while attempting to the elements in February of 1869. also I made a enderBender of our pfp!
Summary of exothermic and endothermic
Please help with the chart 10 questions
1. Which type of energy is representing by the moving of objects?
2. What type of energy is stored?
3. Explain the lot of conversation of energy?
4. A metal spoon and a wooden spoon are placed in a pot of boiling water. What property of the metal spoon causes it to become hotter than the wooden spoon and why?
5. The thing we measure when we want to determine the average kinetic energy of random motion is the particles of a substance is ___________.
6. The __________ is the energy needed to raise the temperature of a substance by 1°C.
7. A(n) ________ reaction is one where the products have lower energy than the reactants.
8. __________ reaction requires energy in order to take place.
9. The __________ is used to describe how much energy is produced or used during a chemical change.
QUICK I NEED THAT A.S.A.P Great Sand Dunes National Park in Colorado is famous for its giant sand dunes. Sand dunes are landforms that are found in deserts and on beaches. Visitors to the park can surf down the dunes on sleds or boards.
After visiting the park with his family, Kerry decides to build a model of a sand dune. In addition to sand, what will he need to form the model?
A. ice
B. plants
C. water
D. wind
Science help due by 11:59 What is gravity like on other planets
compared to Earth?
Explanation:
Mercury 0.377 g
Venus 0.905 g
Earth 1 g (midlatitudes)
Moon 0 .165 7 g (average)
Types of chemical bonds & names
Answer:
There are three primary types of bonding: ionic, covalent, and metallic. Definition: An ionic bond is formed when valence electrons are transferred from one atom to the other to complete the outer electron shell.
Explanation:
Fungus on the crops can be controlled by using
Answer:
Explanation:
Fungicides are agents that are used to prevent or eradicate fungal infections from plants or seeds.
Answer:
Fungus on the crops can be controlled by using:-
Start by planting healthy stock.
Choose planting sites based on plant needs.
Avoid overhead watering.
Water early in the day.
Don't crowd plants.
Don't work a wet garden.
Treat with a trusted, proven fungicide.
Explanation:
hope it helps!
:)
Write out and BALANCE the following equation: Solid Scandium metal
reacts with water to produce Scandium(III) oxide and hydrogen gas.
15 point
An ideal gas deviates from a real gas in its properties at which of the following conditions?
You are currently in a stable orbit 9000 km (1km=1000m) from the center of planet Proxima Centauri B.
According to the calculations done by NASA, Planet Proxima Centauri B has a mass of approximately 7.6x10^24kg.
Based on fuel consumption and expected material aboard the ship, your colony ship lander has a mass of approximately 1.1x10^5 kg.
1. Using Newton's Law of Universal Gravitation, determine what the force of gravity on your ship at that orbit be using the early measurements
2.Using Newton’s second law determine the acceleration of your lander due to gravity
3.Upon arrival, you measure the actual force of gravity to be 6x10^5 N,which is different from your calculated value in question 1. Identify 2 specific possible causes that would account for the difference in expected vs. actual values, and why they would affect the calculation.
we had a sub and she didn't even explain the work-the teacher hasn't even been on the calls for a few days so it's like ''what?'
Explanation:
bro this question looks like Astrophysics
By using the universal gravitational law, the gravitational force between the lander and the planet is 688.4 × 10³ N. The acceleration due to gravity of the lander is 6.25 m/s² . The slight changes in gravity may be due to the change with different latitudes of the planet.
What is gravitational force?Gravitational force is the force by which an object attracts other objects into its center of mass. According to universal gravitational law, the gravitational force can be calculated for two masses m1 and m2 at a distance of r with gravitational constant G as follows:
g = G m1m2/r²
Apply the given values of mass and orbital radius to the equation as follows:
g = (6.647 × 10⁻¹¹ N m² Kg⁻²) (1.1 × 10⁵ Kg × 7.6×10²⁴ Kg ) / (9 × 10⁶ m)²
= 688.4 × 10³ N.
The acceleration due to gravity of the lander = force /mass
= 688.4 × 10³ N /1.1 × 10⁵Kg
= 6.25 m/s²
The actual force of gravity may change from the may slightly change from the calculated value because different latitudes will experience different gravity.
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Rocks that form from lava does not contain fossils. Explain why
As sedimentary rocks are formed from the accumulation of sediment, fossils can be buried and preserved over time, leading to the formation of fossil-rich sedimentary rocks.
What is Fossils?
Fossils are the remains or traces of prehistoric plants, animals, and other organisms that are preserved in rocks. Fossils provide valuable insights into the evolution of life on Earth, as they can help scientists to understand the types of organisms that lived in the past, how they evolved, and how they interacted with their environment.
Rocks that form from lava, such as igneous rocks, typically do not contain fossils because the high temperatures involved in the formation of lava can destroy organic matter, including the remains of plants and animals.
When lava flows onto the surface of the Earth, it can quickly cool and solidify, forming an igneous rock. This rapid cooling process does not allow for the preservation of any organic material that might have been present in the lava, including fossils.
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M C Q s
1) The most reactive metal is :
a) Na b) Cu c) Fe d) Ca
Answer:
A
Explanation:
A, Na b/c The elements toward the bottom left corner of the periodic table are the metals that are the most active in the sense of being the most reactive. Lithium, sodium, and potassium all react with water,
how many moles of CO2 molecules are in 120 g of CO2
Answer:
The answer is 44.0095.
Explanation:
1 grams CO2 is equal to 0.022722366761722 mole. so take that and multiply by 120 and you get 44.0095.
120 g of CO₂ correspond to 2.73 moles of CO₂.
First, we need to determine the molar mass (M) of CO₂ by adding the masses of its elements in 1 mole of CO₂.
[tex]M(CO_2) = M(C) + 2M(O) = 12.01 g/mol + 2(16.00 g/mol) = 44.01 g/mol[/tex]
We have a mass (m) of 120 g of CO₂. We can calculate the number of moles (n) using the following expression.
[tex]n = \frac{m}{M} = \frac{120 g }{44.01 g/mol} = 2.73 mol[/tex]
120 g of CO₂ correspond to 2.73 moles of CO₂.
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Which element, when combined with phosphorus, would form an ionic compound?
A) Carbon.
B)Oxygen.
C)Magnesium.
D)Boron.
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option C.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
Since phosphorus is a nonmetal, we need a metal. Out of given option the only element that is metal is Magnesium while others are non metal.
Therefore, the correct option is option C.
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If an electrical current can run though a solution, it is said to contain what?
Answer:
electrolytes
Explanation:
If an electrical current can run though a solution, it is said to contain ions and the solution in which ions are present is called as electrolytes.
What are ions?
An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.
Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.
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how does this data provide evidence for base pairing in dna
Answer:
There are chemical cross-links between the two strands in DNA, formed by pairs of bases. They always pair up in a particular way, called complementary base pairing: thymine pairs with adenine (T–A) guanine pairs with cytosine (G–C)
Explanation:
Hope it helps u
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How is matter conserved through cellular respiration
Answer:
In cellular respiration, complex molecules containing carbon react with oxygen to produce carbon dioxide and other materials. ... Matter is conserved during cellular respiration because atoms are conserved in physical and chemical processes
Explanation:
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The unbalanced basic equation for the reaction in most airbags is NaN3 --> Na + N2.
A normal airbag needs about 67 liters of Nitrogen gas to fully inflate. (At STP: 1 mole of gas = 22.4 liters of that gas.) How many grams of reactant is needed to produce that amount of gas?
Answer:52!
Explanation: