hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by:
En = −(2.18 × 10^−18J) Z^2 ( 1/n^2 )
where n is the principal quantum number and Z is the atomic number of the element. Plasma is a state of matter consisting of positive gaseous ions and electrons. In the plasma state, a mercury atom could be stripped of its 80 electrons and therefore could exist as Hg80+. Use the equation above to calculate the energy required for the last ionization step.hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by:
En = −(2.18 × 10^−18J) Z^2 ( 1/n^2 )
where n is the principal quantum number and Z is the atomic number of the element. Plasma is a state of matter consisting of positive gaseous ions and electrons. In the plasma state, a mercury atom could be stripped of its 80 electrons and therefore could exist as Hg80+. Use the equation above to calculate the energy required for the last ionization step.hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by:
En = −(2.18 × 10^−18J) Z^2 ( 1/n^2 )
where n is the principal quantum number and Z is the atomic number of the element. Plasma is a state of matter consisting of positive gaseous ions and electrons. In the plasma state, a mercury atom could be stripped of its 80 electrons and therefore could exist as Hg80+. Use the equation above to calculate the energy required for the last ionization step.
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find the valu of
|2x-1|=x+1 is
Explanation:
|2x-1|=x+1
√(2x-1)²= x+1
(2x+1)²=(x+1)²
4x²-4x+1=x²+2x+1
3x²-6x=0
x²-2x=0
x(x-2)=0
x=0 or x=2
Why is it difficult to make vaccines for viruses? (1 point)
O All known vaccine molecules must be tested to find the right one.
O All known viruses must be tested against new vaccines
O Viruses mutate to attack the vaccine molecules so new ones must be continually produced
O Vaccines are very small so it is difficult to determine if the molecule fits
Answer:
All known vaccine molecules must be tested to find the right one.
Explanation:
I took the test
The electrical charge of the nucleus of an atom is +12. How many electrons does the atom have in its neutral state?
O 6
O 12
O 18
O 24
The number of electrons in the atom in its neutral state will be equal to 12. Therefore, option (2) is correct.
What is a neutral atom?A neutral atom can be defined as one in which the number of the positive charge will be equal to the number of the negative charge. Therefore, the overall electrical charge on such an atom is zero and that type of atom is called a neutral atom.
For a neutral atom, commonly say that the number of electrons is equal to the number of protons. All chemical elements present in the modern periodic table are neutral.
Given, the electrical charge of the nucleus of an atom is equal to + 12. It means the given atom has 12 protons. As the number of protons and electrons in the neutral atom is the same, therefore the number of electrons in the given atom is equal to 12.
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How many hydrogen (H) atoms are there in this chemical formula? 3C5HgNNaO4
There don't seem to be any H atoms in that formula. All I see is Hg, which is mercury.
Which statement explains why calcium is classified as
a Group 2 element?
A) A sulfur atom has 2 valence electrons.
B) A sulfur atom has 20 neutrons.
C) Calcium is a grey solid at STP.
D) Calcium reacts with most non-metals.
Answer:
A
Explanation:
This group includes beryllium, magnesium, calcium, strontium, barium, and radium. All group 2 elements have two valence electrons
What ions are produced from acids and from bases?
1.00 g of a compound is combusted in oxygen and found to give 3.14g of CO2 and 1.29 g of H2O. From these data we can tell thatA. the compound contains C, H, and some other element of unknownidentity, so we can’t calculate the empirical formula.B. the compound contains only C and H and has the empirical formulaof C6H.C. the compound contains C, H, and O and has the empirical formulaof CH3O.D. the compound contains only C and H and has the empirical formulaof CH2.E. None of the above is a true statement
Answer:
the compound contains C, H, and some other element of unknownidentity, so we can’t calculate the empirical formula
Explanation:
Mass of CO2 obtained = 3.14 g
Hence number of moles of CO2 = 3.14g/44.0 g = 0.0714 mol
The mass of the carbon in the sample = 0.0714 mol × 12.0g/mol = 0.857 g
Mass of H2O obtained = 1.29 g
Hence number of moles of H2O = 1.29g/18.0 g = 0.0717 mol
The mass of the carbon in the sample = 0.0717 mol × 1g/mol = 0.0717 g
% by mass of carbon = 0.857/1 ×100 = 85.7 %
% by mass of hydrogen = 0.0717/1 × 100 = 7.17%
Mass of carbon and hydrogen = 85.7 + 7.17 = 92.87 %
Hence, there must be an unidentified element that accounts for (100 - 92.87) = 7.13% of the compound.
What is an atomic element
Answer:
An atomic element is an element which exists independently as atoms and can still react with other elements forming a compound
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Type the correct answer in the box. Spell all words correctly.
The boxer crab carries sea anemone in its claws and uses its stinging tentacles against predators. In turn, the anemone consumes the crab's
leftovers. What form of ecological relationship is this?
The relationship between the boxer crab and anemone is a form of
blank
Answer:
The relationship between the boxer crab and the anemone is a form of symbiosis, called mutualism.
Explanation:
The boxer crab —Lybia tesselata— receives its name because it carries anemones in its anterior claws, in the form of boxing gloves, constituting a symbiotic association of a mutual type.
Mutualism is an interspecific relationship where two individuals of different species benefit from each other.
The anemone —usually of the genus Triactis or Bunodeopsis— has tentacles capable of secreting a stinging substance that contributes to the defense of the crab against its natural predators. On the other hand, the crab helps the anemone to transport and feeds on the food remains left by the crab.
Plant A gets no fertilizer, plnt B-5mg/day, and plnt C-10mg/day. Which is the control group?
Answer:
Plant A
Explanation:
This is because Plant A is what you will compare to the other plants. Because it has no fertilizer is is the independent variable.
You eat a large meal and then hike up a hill. What kind of energy transformation is your body performing?
Group of answer choices
Chemical energy to kinetic energy and gravitational potential energy
Chemical energy to kinetic energy and nuclear energy
Kinetic energy to chemical energy and light energy
Gravitational potential energy to sound energy and nuclear energy
Answer:
Chemical energy to kinetic energy and gravitational potential energy
Explanation:
The kinetic and potential energy is collectively known as the mechanical energy. When you eat a large meal and then hike up a hill the energy change taking place is Chemical energy to kinetic energy and gravitational potential energy. The correct option is A.
What is energy?The physical quantity which is transferred from one object to another to perform work or to heat the object is defined as the energy. The SI unit of energy is Joule and it is a derived unit.
The energy possessed by a moving body due to its motion is defined as the kinetic energy. The energy stored by an object due to its position is called the potential energy.
When we eat food, our body uses the chemical energy of food and during climbing, the body gets moved so the kinetic energy gets converted into gravitational potential energy.
Thus the correct option is A.
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How many grams does 1.0 liter of motor oil weigh if the density of motor oil is 0.80 g/mL?
Answer:
800 grams
Explanation:
Density = mass/volume => mass = Density x Volume
Density = 0.80 g/ml
Volume = 1.0 Liter = 1000 ml
mass of 1.0 liter = 0.80 g/ml X 1000 ml = 800 grams
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H2O + C16H17NaO14 = CO2 + 8H20 + C2H3NaO3 Since there are 19 Hydrogen on the Reactants side, due to Law of Conservation of Mass, there must be ___Hydrogen on the Product side.
A. 0
B. 2
C. 8
D. 19
Answer: 8
Explanation:
A 6M sulfuric acid solution (H2SO4 in water) is flowing into a tank at the rate of 100 liters/min (also can be written 100 L/min). The density of the solution is 1.34 g/cm3 . Determine the value of the items requested below (show your work). For parts (b) - (d), first write out the equation using symbols for the appropriate variables, then algebraically solve for the unknown variables, and finally substitute in the numerical values and calculate the values for the unknown variables
Based on the flow rate data provided for the 6 M sulfuric acid solution;
molar flow rate = 600 mol/minMass flow rate = 58.8 kg/mintotal mass flow rate = 134 kg/min What is the molar mass of sulfuric acid, H2SO4?The molar mass of sulfuric acid is obtained from the molar atomic masses of it component elements.
Molar mass of H2SO4 = (2 × 1) + (32 × 1) + (16 × 4)
Molar mass of H2SO4 = (2 = 98 g/mol
Based on the flow rate data provided:
Moles of 6 M sulfuric acid in 100 L = molarity × volume
Moles of 6 M sulfuric acid in 100 L = 6 M × 100 L = 600 moles
molar flow rate = 600 mol/min
Mass of 600 moles sulfuric acid = moles × molar mass
Mass of 600 moles sulfuric acid = 600 × 98 = 58.8 kg
Mass flow rate = 58.8 kg/min
Mass of sulfuric acid in 100 L solution = volume × density
density of sulfuric acid = 1.34 g/cm^3 = 1.34 kg/L
Mass of sulfuric acid in 100 L solution = 1.34 kg/L × 100 L = 134 kg
Therefore, total mass flow rate = 134 kg/min
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Metals can be involved in ____
Answer: ionic bonds, covalent bonds
Explanation:
Got it right on my test.
Metals can forms ionic bond with non-metals by losing electrons from metals to the non-metals. They can also form metal metal bonds when they make metallic complexes and dimers. Thus option 4 is correct.
What is ionic bonding ?Ionic bond is the strongest type of bond formed between metals and nonmetal. Metals are electron rich and thus they are electropositive. They can donate electrons to non-metals.
Electronegative non metal atoms gain one or more electrons from the metals and thus forms the ionic compounds. Hence, ionic compounds are formed between atoms of high electronegativity difference.
Non metals like oxygen, nitrogen , halogens etc are highly electronegative and withdraw electrons from metals. Ionic compounds can have polarity if there occurs a charge separation between atoms.
Metals can also form metal-metal bonds with other metals in the case of coordination compounds and organometallic compounds. Hence, option 4 is correct.
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Your question is incomplete. But your complete question probably was:
Metals can be involved in _______ ?
1, Covalent bonding
2.Ionic bonding
3. Metal-metal bond
4. Two of the above.
what is a redox reaction ?
Answer:
[tex]\sf\fbox\red{Answer:-}[/tex]
Redox is a type of chemical reaction in which the oxidation states of atoms are changed.
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A perfume bottle is dropped in the corner of a room. The odor of the perfume can be detected on the other side of the room. Which statement best describes this observation?
Particles are moving from regions of high concentration to low concentration.
Particles are moving from regions of low concentration to high concentration.
Particles are moving through a small opening into a smaller volume.
Particles are moving through a small opening into a larger volume.
Answer: Particles are moving from regions of high concentration to low concentration.
Explanation:
Diffusion is driven by differences in concentration. When chemical substances such as perfume are let loose in a room, their particles mix with the particles of air. The particles of smelly gas are free to move quickly in all directions. They eventually spread through the whole room from an area of high concentration to an area of low concentration. This continues until the concentration of the particles of smelly gas is the same throughout the room. Remember that the particles still move, even when the smell is evenly spread.
Answer:
Answer: Particles are moving from regions of high concentration to low concentration.
Explanation:
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How many liters of CO2 and H2O - measured together at 710 K - can be produced from the combustion at 710 K of 5.75 L of CH4 and as much O2 as needed?
In the complete combustion of 5.75 L of CH₄ at 710 K, 5.75 L of CO₂ and 11.5 L of H₂O.
What is combustion?Combustion is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.
Step 1: Write the balanced combustion reaction.CH₄(g) + 2 O₂(g) ⇒ CO₂(g) + 2 H₂O(g)
Step 2: Calculate the volume of CO₂ produced.According to the balanced equation, the volume ratio of CH₄ to CO₂ is 1:1.
5.75 L CH₄ × 1 L CO₂/1 L CH₄ = 5.75 L CO₂
Step 3: Calculate the volume of H₂O produced.According to the balanced equation, the volume ratio of CH₄ to H₂O is 1:2.
5.75 L CH₄ × 2 L H₂O/1 L CH₄ = 11.5 L H₂O
In the complete combustion of 5.75 L of CH₄ at 710 K, 5.75 L of CO₂ and 11.5 L of H₂O.
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vitamin A in chemistry
Answer:
[tex]\sf\fbox\red{Answer:-}[/tex]
Vitamin A is a fat-soluble vitamin and an essential nutrient for humans. It is a group of organic compounds that includes retinol, retinal (also known as retinaldehyde), retinoic acid, and several provitamin A carotenoids (most notably beta-carotene (β-carotene).
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Adam likes to make sure he eats healthy diet including fruits and vegetables. His body system works to make sure this food is broken down into small enough pieces and is then delivered to the areas in his body that need it the most . Which body system will work together to make sure nutrients get to every cell in his body
Answer:
Explanation:
Your circulatory system carries oxygen, water, and nutrients to cells throughout your body. Wastes from the cells are eliminated by your respiratory system, your excretory system, and your skin. Your nervous system controls all these activities with electrical impulses.
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Answer:
Thx
Explanation:
. In an experiment, 1.90 g of NH3 reacts with 4.96 g of O2. 4NH3(g) + 5O2(g) ⟶ 4NO(g) + 6H2O(g) (i) Which is a limiting reactant? Show your working. (ii) How many grams of excess reactant remain? Show your working. (iii) How many grams of NO is formed? Show your working
1. The limiting reactant in the reaction is NH₃
2. The mass of the excess reactant remaining is 0.49 g
3. The mass of NO produced from the reaction is 3.35 g
Balanced equation4NH₃ + 5O₂ —> 4NO + 6H₂O
Molar mass of NH₃ = 14 + (3×1) = 17 g/mol
Mass of NH₃ from the balanced equation = 4 × 17 = 68 g
Molar mass of O₂ = 16 × 2 = 32 g/mol
Mass of O₂ from the balanced = 5 × 32 = 160 g
Molar mass of NO = 14 + 16 = 30 g/mol
Mass of NO from the balanced equation = 4 × 30 = 120 g
SUMMARY
From the balanced equation above,
68 g of NH₃ reacted with 160 g of O₂ to produce 120 g of NO
1. How to determine the limiting reactantFrom the balanced equation above,
68 g of NH₃ reacted with 160 g of O₂
Therefore,
1.90 g of NH₃ will react with = (1.90 × 160) / 68 = 4.47 g of O₂
From the calculation made above, we can see that only 4.47 g out of 4.96 g of O₂ given is needed to react completely with 1.90 g of NH₃.
Therefore, NH₃ is the limiting reactant.
2. How to determine the mass of the excess reactant remaining Mass of excess reactant (O₂) given = 4.96 gMass of excess reactant (O₂) that reacted = 4.47 gMass of excess reactant (O₂) remaining =?Mass of excess reactant (O₂) remaining = 4.96 – 4.47
Mass of excess reactant (O₂) remaining = 0.49 g
3. How to determine the mass of NO producedIn this case, the limiting reactant (NH₃) will be used.
From the balanced equation above,
68 g of NH₃ reacted to produce 120 g of NO
Therefore,
1.90 g of NH₃ will react to produce = (1.90 × 120) / 68 = 3.35 g of NO.
Thus, 3.35 g of NO were obtained from the reaction.
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What is an orbital? (10 points)
Why do water pipes sometimes burst in winter? (Has to do with volume)
Answer:
Water pipes sometimes burst during the winter because the cold causes the water to expand when frozen so the pipes cant exactly stretch causing stress on the pipe until it inevitably bursts
How are infrared visible light and ultraviolet Ray's related.
Answer:
Infrared radiation has longer waves than red light, and thus oscillates at a lower frequency and carries less energy. Ultraviolet radiation has shorter waves than blue or violet light, and thus oscillates more rapidly and carries more energy per photon than visible light does.
Explanation:
Identify the shape of the molecules that could result from each of the hybrid orbitals given below. Check all of the boxes that apply. sp-orbitals bent, linear, trigonal planar.
Answer:
sp2 = Bent, trigonal plannar
ap3=Bent, trigonal bipyramidal
Explanation:
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Answer:
sp2 bent
trigonal planar
sp3 bent
tetrahedral
Explanation:
An ideal solution is prepared by mixing 15.6 g of toluene, C6H5CH3, and 136.2 g of butan-
1-ol, C4H9OH at 25 °C. The vapour pressure of pure butan-1-ol is 885 Pa at this
temperature. Calculate the partial pressure of butan-1-ol in the vapour above the mixture.
This problem is providing the masses of both toluene and butan-1-ol and the vapor pressure of the latter when pure. Thus, it asks for the vapor pressure of this alcohol in the mixture, therefore the answer turns out 812 Pa.
Raoult's lawIn chemistry, when two pure liquids are mixed, their properties as a mixture differ from those when pure, for that reason we use the Raoult's law in order to quantify these properties as pure substances, or when mixed with other substances.
In such a way, one can write this law for butan-1-ol as follows:
[tex]P_{but}=P_{but}^{pure}*x_{but}[/tex]
Where we know its vapor pressure as 885 Pa and we want to calculate its partial pressure but first its molar fraction with the given masses converted to moles as follows:
[tex]x_{but}=\frac{n_{but}}{n_{but}+n_{tol}} \\\\n_{but}=136.2g*\frac{1mol}{74.121g}=1.838mol\\ \\n_{tol}=15.6g*\frac{1mol}{94.14g} =0.166mol\\\\x_{but}=\frac{1.838mol}{1.838mol+0.166mol}=0.927[/tex]
Finally, we solve for its partial pressure:
[tex]P_{but}=885Pa*0.917\\\\P_{but}=812Pa[/tex]
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Which unequal condition causes a sea breeze to develop
A:warmer air over land than water
B:warmer air over water than land
Please help me
Answer:
Drier air over land than water
OR
A:warmer air over land than water
Which term identifies the amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius?
Specific heat
Boiling point
Melting point
Specific heat capacity
The term that identifies the amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius is Specific heat capacity.
What is specific heat capacity?
Specific heat capacity is the quantity of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius. The unit of specific heat capacity is joule per gram per degree Celsius (J/g⁰C).
Difference between heat capacity and specific heat capacitySpecific heat capacity is heat required to raise the temperature of a unit mass of a substance while heat capacity is the quantity of heat required to raise the temperature an entire mass of a substance.
Heat capacity is measure in Joules (J) while specific heat capacity is measured in joule per gram per degree Celsius (J/g⁰C).
Thus, the term that identifies the amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius is Specific heat capacity.
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The term that identifies the amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius is : ( A ) Specific heat
Specific heatSpecific heat also known specific heat is the amount of heat that is added to 1 unit ( gram ) of a substance in order to raise its temperature by one ( 1 ) degree Celsius of temperature.
Hence we can conclude that The term that identifies the amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius is Specific heat
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who often does galeras erupt
Answer:
Galeras has erupted more than 20 times since the 1500s. Volcanic activity has been frequent in the last five years, including an eruption in January 1993 that killed nine people on a scientific expedition to the volcano summit. Chuck Wood of VolcanoWorld was on Galeras at that time but was not injured
Explanation:
Galeras has erupted more than 20 times since 1500s. Volcano activity has been frequent in the last 5 years,including an eruption in January 1993 that killed nine people on a scientific expedition to the volcano summit.