Answers
Answer: C & D
Explaination:
C because the atomic number increases sequentially and also the nuclear charge
D because as you're moving down a column the valance electrons does not change, only the atomic radius does.
Related Questions
Which are reactions that release energy?
Answers
Which statements explain why theories change over time? Check all that apply.
Scientists change the definition of theory to have their ideas accepted.
New information and technology may be developed that influence the theory.
Theories change with each new generation of scientists.
New experimental methods provide new information.
Theories may or may not be supported by new information.
Answers
The following are true about a theory;
New information and technology may be developed that influence the theory.New experimental methods provide new information.Theories may or may not be supported by new information.What is a theory?A theory is an explanation that is given to a phenomenon which may have some kind of underpinning reasoning that may not necessarily be empirical. Thus a theory has withstood some kind of scrutiny but is not yet absolutely accepted as true.
Thus the following are true about theory;
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What volume (in L) of 1.50 M Na₂CO₃ would be required to obtain 0.650 moles of Na⁺ ions?
Answers
The Volume of Na₂CO₃ solution required to obtain 0.650 moles of Na⁺ ions is 216 mL.
What is the number of moles sodium ions produced by the dissociation of 1 mole of Na₂CO₃?The number of moles sodium ions produced by the dissociation of 1 mole of Na₂CO₃ is determined from the dissociation equation of Na₂CO₃ given below:
Na₂CO₃ (aq) → 2 Na⁺ (aq) + CO₃²⁻ (aq)
From the equation above, 1 mole of Na₂CO₃ produces 2 moles of Na⁺ ions.
Number of moles of Na₂CO₃ that will produce 0.650 moles of Na⁺ ions = 0.650/2 moles
Number of moles that will produce 0.650 moles of Na⁺ ions = 0.325 moles of Na₂CO₃ solution.
Volume of Na₂CO₃ solution required = moles of Na₂CO₃/molarityVolume of Na₂CO₃ solution required = 0.325/1.5
Volume of Na₂CO₃ solution required = 0.216 L
Volume of Na₂CO₃ solution required in mL = 216 mL
In conclusion, the volume of Na₂CO₃ solution required is obtained from the molarity and moles of Na₂CO₃.
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You sent
Can you please review the following to ensure that I'm doing this right ?
If I have a medication (powder) that is 1 gram / 100gallons of water and I want to treat a 75gallon aquarium.
1 gram = 1mL
Let's say I take 1 gram and add it to a bottle of 40mL of water. Shake it up and then draw it up with a syringe that is in MLs.
Is this the correct dimensional analysis
40MLs x 1gram/100gallons x 75 gallons = 30 MLs
So then from the solution in the bottle I would draw up 30 mLs and add that to the fish tank?
Is this correct
Answers
The volume of medication required for 75 gallons is 30 mL.
What is the correct procedure for determining the volume of a medication powder that is 1 gram / 100gallons of water required to treat a 75 gallon aquarium?The correct procedure for determining the volume of a medication powder that is 1 gram / 100gallons of water required to treat a 75 gallon aquarium is the procedure which ensures that the answer expressed in the proper units.
The required concentration of the medication is 1 gram / 100gallons of water.
Volume of water to be be treated is 75 gallon.
1 g of the medication is dissolved in 40 mL of water.
Therefore, 40 mL of the medication contains 1 g of the medication powder.
40 mL of the medication will treat 100 gallons of water.
Volume of medication required for 75 gallons will be:
Volume of medication required for 75 gallons = 40 mL * 1 g/ 100 gallons * 75 gallons
Volume of medication required for 75 gallons = 30 mL
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What is one element a topographic map shows?
Air flow
Climate
People
Relief
Answers
Answer:
Relief is one element on a topographic map
Explanation:
Which monatomic ions would you expect potassium (Z=19) and oxygen (Z=8) to form?
Answers
The monoatomic ion of potassium is K+ and Oxygen is O2-
The term "monatomic ion" refers to an ion with only one atom. A polyatomic ion is one that has more than one atom, even if they are all from the same element.The monatomic ions generated by potassium (K) and Oxygen (O) are being askedwe will first look for the group number that an element belongs to in order to establish the charge of that element. For non-metals, the charge of the ion is calculated by deducting 8 from the group number For metals, the charge of the ion is equal to the group number.Since K is a metal, its ion is a cation with a charge of 1, and it is a member of group 1A. K+ is hence the potassium's monoatomic ion.similarly oxygen is non metal therefore the monoatomic ion of oxygen is O2−.Learn more about monoatomic ions here:
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What is density?
A.The volume of an object.
B.The weight of an object.
C.The measure of mass of a material within a given space.
D.The mass of an object.
+11 points
Answers
Answer:
C.The measure of mass of a material within a given space.
Explanation:
C. The measure of mass of a material within a given space.
What is the correct way to report the length of the rectangle in centimeters ?
Answers
The length of the rectangle is 16 cm.
What is the length of the rectangle?We know that area is the product of the rectangle is the product of the length and the breadth of the rectangle. The perimeter of the rectangle is the distance round the rectangle. In this case, the rectangle has been showed in the image attached to the question.
We can see the meter rule which is the instrument that is used in the measurement of length. The meter rule is often calibrated in accordance with the metric system or the subunits of the metric system.
Having looked at the measurement is shown in the image shown, it is then clear that the length of the rectangle is 16 cm.
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find the absolute and percent relative uncertainty
91.3 (+-1.0) mM * (40.3 (+-0.2) mL) / (21.1 (+-0.2) mL)
Answers
a. The percentage relative uncertainty is 1.1 %
b. The absoulte uncertainty is ± 1.9
a. How to calculate the percentage relative uncertainty?Since 91.3 (+-1.0) mM * (40.3 (+-0.2) mL) / (21.1 (+-0.2) mL) is in the form
R = A × B/C, the relative uncertainty is given by
ΔR/R = √[(ΔA/A)² + (ΔB/B)² + (ΔC/C)²] where
ΔA = ± 0.2 mMA = 91.3 mMΔB = ± 0.2 mLB = 40.3 mLΔC = ± 0.2 mLC = 21.1 mLSubstituting the values of the variables into the equation, we have
ΔR/R = √[(ΔA/A)² + (ΔB/B)² + (ΔC/C)²]
ΔR/R = √[(0.2 mM/91.3 mM)² + (0.2 mL/40.3 mL)² + (0.2 mL/21.1 mL)²]
ΔR/R = √[(0.002191)² + (0.004963)² + (0.009479)²]
ΔR/R = √[0.00000480 + 0.00002463 + 0.00008985]
ΔR/R = √0.00011928
ΔR/R = ± 0.0109
ΔR/R ≅ ±0.011
So, the percentage relative uncertainty % ΔR/R = ΔR/R × 100 %
= 0.011 × 100 %
= 1.1 %
So, the percentage relative uncertainty is 1.1 %
b. How to calculate the absolute uncertainty?Since R = A × B/C where
A = 91.3 mM, B = 40.3 mL and C = 21.1 mLSo, R = A × B/C
= 91.3 mM × 40.3 mL/21.1 mL
= 3679.39 mMmL/21.1 mL
= 174.38 mM
≅ 174.4 mM
Now, the absoulte uncertainty in R, ΔR = ΔR/R × R
= ±0.011 × 174.4 mM
= ± 1.92
≅ ± 1.9
So, the absoulte uncertainty is ± 1.9
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(d) Why did Thomson conclude that atoms also contain
a positive charge?
Answers
Answer: To counterbalance the negative charge on the electrons.
Explanation:
The plum pudding model
Thomson knew that atoms had an overall neutral charge. Therefore, he reasoned that there must be a source of positive charge within the atom
Thomson found that the path taken by the cathode ray could be bent towards a positive metal plate, and away from a negative metal plate. As a result, he reasoned that the particles in the cathode ray were negative.
: )
I need some help with crush advise. So basically i have a crush on this dude but i don't think he know me we are not in the same class but we see each other at morning time and recess by the way he is Vietnamese and he is cute. If you have some advice. ( PLEASE TELL ME) please don't just steal the points, really help me out
Answers
Answer:
Go for it!
Explanation:
You only live once, seriously just go up and talk to him. Say something like, "Hey, you seemed cool I just wanted to say hi. Do you have an ig?" :) you won't regret it.
Answer:
There are a couple of things you should do! first, you should become his friend, and be a good friend, too. Don't fl!rt with him when you first meet, or in the first couple of times you guys meet. Ask him things you are genuinely curious to know about him, don't ask generic questions such as " whats your favorite color" or make small talk. Ask him things that relate to him more like what's his full name, or where is he from. If you really are curious to know what his favorite color is, you can ask him, but make sure he knows you are genuinely curious to know, and not just making small talk. After getting to know him better, you have to ask yourself if you are still interested in him in "that" way, or interested at all, even. If the answer is yes, you still have love interest the next thing you should know is if he is single, or likes someone. When you ask him if hes single don't make it weird if he says no, just be chill. If he is single, but has a crush on someone you should ask him who. If he doesn't tell you and you guys are close already, it's probably you. After finding out all these things about him, you should wait about 2 months and then confess to him that you like him (if he has not already confessed to you) and no worries if he rejects you, rejection happens sometimes and it's totally okay. It may not feel like it right away, or even longer away but you will eventually get over him.
Explanation:
I hope these tips were helpful, and if you have any more questions please ask I'm here to help you <3
how are physical and chemical properties of each family different?
Answers
Physical and chemical properties of each family different 'depend on valence electron'
The vertical columns on the periodic table are called groups or families because of their similar chemical behavior and all the members of a family of elements have the same number of valence electrons and similar chemical properties and isotopes of an element have same number of electron as an atom of that element but they have different number of neutron which affect the mass number and mass number determine the physical properties while atomic number determine the chemical properties
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1.) A substance has a pOH of 5.9. Calculate the [OH-] of the substance and explain how you reached your answer? (30 points) 2.) If the pH of a substance is 3, what is the pOH of the substance? Explain how you reached your answer. (35 points) 3.) Would you expect the [H3O+] concentration of hydrogen sulfide (H2S) to be high or low? Explain your answer. (35 points)
Answers
The pOH of the substance is known to be given by the hydroxide ions. A substance has a pOH of 5.9. The [OH-] of the substance is 7.23.
What is pOH?By estimating the concentration of OH ions in a solution, pOH can be used to gauge both acidic or alkaline a solution is. The OH ion concentration's negative logarithm is known as pOH.
pOH = -[tex]\rm -Log_{10}[OH]^{-}[/tex]
In this problem,[tex]\rm -Log_{10}[OH]^{-}[/tex]
pOH = ] = [tex]\rm -Log_{10}[OH]^{-}[/tex]
- log₁₀[5.9] = 7.23
A substance has a pOH of 5.9. The [OH-] of the substance is 7.23 .
Once you get the value of pOH we will get the value of pH.
pOH = 14 - pH
pH = 14 - 3 = 11
An acid that is weak is [tex]\rm H_{2} S[/tex]. As a result, has a pH of 3.92.
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The two main types of weathering are
mechanical and physical
physical and kinetic
chemical and physical
chemical and acidic
Carbonic acid
Answers
Answer:
chemical and mechanical/physical
Answer:
C
Explanation:
Chemical/Physical
Calculate the mass of boron present in 30 g of borax.
Answers
the mass of boron present in 30 g of borax is 1.991×10²⁴
Chemical element boron has the atomic number 5 and the letter B in its symbol. It is an amorphous brown powder and a brittle, black, glossy metalloid in its crystalline form. There may be antioxidant effects of boron. Boron is frequently used to treat vaginal yeast infections and boron insufficiency. Additionally, it is used to treat menstrual cramps, osteoarthritis, osteoporosis, and numerous other ailments, but many of these applications lack strong scientific backing.
Molar mass of B = 10.81g/mol
So, 1 mole of B = 10.81g
and 1 mole = NA= 6.023×10²³
By combining,
10.81g of B = 6.023×10²³ atoms of B thus,
35.76g of B = 6.023×10²³
10.81×35.76
35.76g of B
= 1.991*10²⁴
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Calculate the mass of 12.044x10^23 atoms of calcium
Answers
Answer: 2g
Explanation: 12.044 * 10^23/6.022*10^23 * 1 = 2
An unknown compound contains only carbon, hydrogen, and oxygen (C₂H₂O₂). Combustion of
4.50 g of this compound produced 6.60 g of carbon dioxide and 2.70 g of water.
How many moles of carbon, C, were in the original sample?
Express your answer to three significant figures and include the appropriate units.
Answers
The number of moles of carbon in the original sample is 0.15 moles.
Let the formula of compound be CaHbOc.
The reaction when this compound undergoes combustion is as follows,
CaHbOc + O2 = CO2 + H2O
We are given that 4.50 g of compound releases 6.60 g of CO2 and 2.70 g of H2O.
First we have to calculate the moles of CO2 and H2O by dividing the given mass by their molar mass.
Moles of CO2 = 6.60/44 = 0.15 moles
Moles of H2O = 0.15 moles
The mass of carbon in CO2 = 0.15 x 12 = 1.80 g
The mass of carbon in CO2 is equal to the mass of carbon in the original sample.
Therefore, the number of moles of carbon in the original sample is 0.15 moles.
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Which of the following processes requires more heat energy?
a. raising the temperature of 100. g of water by 10.0 °C
b. raising the temperature of 100. g of aluminum by 10.0 °C?
Answers
Raising the temperature of 100 grams of water by 10.0 C is one of those processes which requires more heat energy.
What degree of heat can 100 grams of water withstand?30.514KJ is the amount of heat can 100 grams of water withstand.
Water has a volume of 100 milliliters and weighs 100 grams. (100°C - 27°C) is the temperature difference, which equals 73°C. Water has a specific heat of 4.18 J/g/°C, thus we can apply the calculation below to determine how much energy is required. The necessary energy is equal to 30.514KJ for 100g at 73°C and 4.18 J/g/°C.
What happens to water's thermal energy as it transforms from a liquid to a solid state?Once all of its thermal energy is gone, water freezes, changing from a liquid to a solid. In our daily lives, these kinds of occurrences constantly occur. Puddles, ponds, lakes, and even parts of oceans freeze when the water gets cold enough. In colder climates, the surface water on Earth freezes and solidifies.
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4521 kg into milligrams
Answers
Answer:
5421 kg = 5421000 mg
Explanation:
Hope this helps!
Answer:
4521 kg = 4521000000 milligrams
Hope this helps :)
a block has a mass of 4.465 g ad a volume of 144.2cm3 calculate the density in g/cm3
Answers
Density of given block is 0.0308 g/cm³
The measure of how densely a material is packed together is called density. As the mass per unit volume, it is defined as mass per unit Volume. Unit of density is g/cm³the cubic measurement of the area taken up by a three-dimensional object is volume.The quantity of matter that makes up a thing is referred to as its mass.unit of mass gram, kilograms etc.Given,
mass of the object is 4.465g
volume of the object is 144.2cm³
we have to find out density of object in g/cm³
we know that,
Density = mass / volume
= 4.465 / 144.2 cm³
= 0.0308 g/cm³
Therefore density of object with mass of 4.465 g and volume of 144.3cm³ is 0.0308 g/cm³.
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Liquid hexane (CH3(CH2)4CH3) reacts with gaseous oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O) . If 24.0g of carbon dioxide is produced from the reaction of 22.40g of hexane and 124.1g of oxygen gas, calculate the percent yield of carbon dioxide.
Round your answer to significant figures.
Answers
54% is the calculated percent yield.
The correct answer is:
Finding the limiting reactant is the first step. To do this, we figure out how many moles there are of each ingredient and divide the answer by the stoichiometric coefficient.
3.4 g octane divided by 114.23 g/mol yields 0.030 mol octane.
0.015 mol octane/2 0.030
5.9 g O2 / 32 g/mol equals 0.18 mol O2.
0.0074 mol = 0.18 mol O2/25
The limiting reactant in this example is oxygen, which is the lower number. The value is in accordance with the reaction's theoretical yield. In a similar manner, the product is used to determine the genuine yield. 0.0636 mol CO2 is equal to 2.80 g CO2/44.01 g/mol.
0.00398 mol = 0.0636 mol CO2/16
The ratio of the two times 100 is what determines the percent yield.
% yield = 0.0398/0.0074 * 100, or 54%.
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density is 1.53g/cm^3 what is the mass of 26.0l of this substance in kg
Answers
Mass of substance is 39.78kg
The amount of matter that makes up an object is quantified by its mass. The kilogramme or kg is the fundamental SI unit of mass.The measure of how densely a material is packed together is called density. As the mass per unit volume.Density = mass / volume
We can find out any term if the value of two terms are given in the formula.Given,
Density of the substance is 1.53g/cm³
Volume of the substance is 26 L = 26000cm³
we have to find out mass by this two terms
Density = mass / volume
1.53. = mass / 26000
mass = 26000 × 1.53
= 39780gm = 39.78kg
Therefore the mass of the given substance is 39.78kg.
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30. What is the final volume of a 400.0 mb gas sample that is subjected to a temperature
change from 22.0 °C to 30.0 °C and a pressure change from standard pressure to 0.47 atm?
Gas Law Used:
Answers
The calculated final volume is V2 = 410.84 mL
The unit of pressure equal to the average atmospheric pressure at sea level is known as a standard atmosphere, or atm. The SI unit of pressure is the atm, which is precisely 101,325 pascals.
Standard pressure is 1 atmosphere, or 760 mm Hg, and the standard temperature is 273 Kelvin, or 0°C. In an experiment, a mole of any gas at STP takes up 22.4 litres of space. The equation has the following form: At STP, one mole of gas is 22.4 liters of gas.
V1/T1 = V2/T2
400.0/295 /V2/303 295 x V2 = 400.0 x 303 295
V2 = 121200 /V2 = 121200/295
V2 = 410.84 mL where
T1 = 22.0°C + 273
= 295 K and
T2 = 30.0°C + 273
= 303 K
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Question 19
When the reaction here goes in the backwards direction what is acting as the base?
H3O+ PH3 PH4* + H₂O.
OPH₂*
O H₂O
OPH₂
O H₂O*
1.5 p
Answers
If you ride your bicycle down a straight road for 500 m then turn around and ride back, your distance is ____your displacement.
Answers
Answer:
Greater than
Explanation:
Use the periodic table to predict which ion will form from each main-group element.
Na:
F:
N:
I:
Sr:
Answers
The ions that are formed by the ions is;
Na^+F^-N^3-I^-Sr^2+What is an ion?The term ion refers to a specie that is obtained by the loss or gain of electrons. A positive ion is formed by the loss of electrons while a negative ion is formed by gain of electrons.
A positive ions has more protons than electrons while a negative ion has more electrons than protons. There is only one major ion that could be formed by main group elements.
The ions that are formed by the ions is;
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A 2.300 −g sample of quinone (C6H4O2) is burned in a bomb calorimeter whose total heat capacity is 7.854 kJ/∘C . The temperature of the calorimeter increases from 24.64 ∘C to 32.09 ∘C .What is the heat of combustion per gram of quinone?
Answers
The heat of combustion per gram of quinone is -25.43 KJ/g.
A constant-volume bomb calorimeter can be used to calculate a substance's heat of combustion. The heat absorbed by the bomb calorimeter can be compared to the heat emitted by the reaction. Additionally, it is necessary to understand the calorimeter's heat capacity.- Q(rxn) = Q(cal) = C(cal)ΔTGiven,
mass of sample = 2.300g
total heat capacity = 7.854 kJ/∘C
Temperature change = 32.09 - 24.64 = 7.45
we have to find out heat of combustion per gram of quinone.
- Q(rxn) = Q(cal) = C(cal)ΔT
Q(rxn) = -(7.854kJ/⁰C)(32.09 - 24.64)
= -58.5 KJ
Now, we will calculate heat of combustion per gram.
Q(rxn) = -58.5/2.3g = -25.43 KJ/g
negative sign denote exothermic reaction.
Thus, heat of combustion per gram of quinone is -25.43 KJ/g.
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please don't search this up thx or ill taker the points back- the question I need help is-What are respiratory disorders? Explain that term in your own words.
Answers
These are diseases that affect primarily the lungs or any other part of the respiratory system.
What are respiratory disorders?The term respiratory disorders refers to those diseases that affect primarily the lungs or any other part of the respiratory system. These are the diseases that prevent a person from breathing in and out normally and prevent the lungs from playing its usual role in gaseous exchange.
The respiratory disorders could be able to make a person not to be able to breathe well and it may lead to hospitalization and death of the patient of adequate treatment is not sought from an expert who could diagnose and treat such respiratory disorders.
The common types of respiratory disorders are;
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I don't know how to write the chemical form of glucose. Can you guys help me?
Answers
answer:
that is the chemical form of glucose.
Match each electron configuration to the correct element. Use the periodic table to determine the number of electrons that each element has. Drag the tiles to the correct boxes to complete the pairs. Tiles [Kr] 5s2 4d10 5p2 1s2 2s2 2p6 3s2 3p5 1s2 2s2 2p6 3s2 3p6 4s2 3d10 [Ar] 4s2 3d6
Answers
[Kr]5s₂4d₁₀5p₂, 1s₂2s₂2p₆3s₂3p₅, 1s₂2s₂2p₆3s₂3p₆4s₂3d₁₀, [Ar]4s₂3d₆ are electronic configuration of tin (Sn), Chlorine (Cl), Zinc (Zn), Iron (Fe) respectively.
The distribution of electrons in an element's atomic orbitals is described by the element's electron configuration. Atomic electronic configurations are written using a standard notation that arranges all atomic subshells that contain electrons in a sequential order.Filling of atomic Orbitals are done by following principles: Aufbau principle, Pauli exclusion principle, and Hund's rule.The theory states that electrons fill up in the following order: 1s, 2s, 2p, 3s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, and 7s, 5f, 6d, 7p....[Kr]5s₂4d₁₀5p₂
Tin
Number of electrons = 50
1s₂2s₂2p₆3s₂3p₅
Chlorine
Number of electrons = 17
1s₂2s₂2p₆3s₂3p₆4s₂3d₁₀
Zinc
Number of electrons = 30
[Ar]4s₂3d₆
Iron
Number of electrons = 26
Hence, these electronic configuration are of Tin, chlorine, zinc, and Iron.
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Answer: screen shot below.
Explanation: