Answer:
Ca
Explanation:
Ca is larger than Ca2+ because, in the periodic table, the atomic radius increases from top to bottom and from left to right. Also Ca has 2 more electrons than Ca2+ therefore, its atom is bigger because it has an extra shell.
Ca²⁺ is smaller than Ca. As Ca²⁺ has lost two electrons to become positively charged.
Ca²⁺ is the calcium ion, which has lost two electrons to become positively charged. When an atom loses electrons, it becomes smaller because there are fewer negatively charged electrons in the electron cloud to balance the positive charge of the nucleus.
On the other hand, Ca refers to the neutral calcium atom, which has an equal number of protons and electrons. In comparison to Ca²⁺, the neutral calcium atom has two additional electrons, which increases the electron cloud and overall size of the atom.
Therefore, Ca²⁺ is smaller than Ca.
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How much of earth's freshwater is in the solid state or under ground?
That would be B: 33%, but please correct me if I'm wrong ^^
Answer:
that would be b:33 i believe pls dont blame met
6
The
force between each planet and the Sun keeps the planets in orbit around the Sun.
OA.
frictional
OB magnetic
OC.
gravitational
OD.
nuclear
Reset
Next Question
Answer:
oc gravitaional
Explanation:
Charlotte completed an experiment in which she investigated and discovered that an electrically charged object can attract an uncharged object without any contact. She used a PVC pipe and small pieces of paper for her experiment. Each time, she rubbed the PVC pipe with a cloth to give it a charge and then held it over paper. What would be Charlotte's control group in this experiment?
1. Using the cloth and rubbing it against the PVC pipe
2. Taking the pieces of paper and rubbing it against the cloth
3. Not rubbing the cloth against the PVC pipe or the paper
4. Rubbing the cloth against both the paper and the PVC pipe
Charlotte's control group in this experiment would be "Not rubbing the cloth against the PVC pipe or the paper." (C)
Answer:
C. Not rubbing the cloth against the PVC pipe or the paper
Explanation:
Hope this helped! :)
14
Select the correct answer.
Which of these groups of elements show the least electronegativity?
A. inner-transition elements
B. halogens (7A)
O C.
alkali metals (1A)
D.
transition elements
O E
alkaline earth metals (2A)
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The alkali metals (1A) show the least electronegativity among the groups of elements listed.
What is electronegativity ?Electronegativity is the tendency of an atom to attract electrons towards itself when it forms a chemical bond with another atom. It is determined by factors such as the nuclear charge, atomic radius, and electron configuration of the atom.
Elements with high electronegativity values, such as the halogens (7A) and oxygen, tend to attract electrons strongly and form negative ions or polar covalent bonds.
On the other hand, elements with low electronegativity values, such as the alkali metals (1A) and alkaline earth metals (2A), have weak tendencies to attract electrons and are more likely to lose electrons and form positive ions in chemical reactions.
Among the groups listed, the alkali metals have the lowest electronegativity values, as they have a single valence electron that is located far from the nucleus and shielded by inner electrons. This makes them highly reactive and easily form cations in ionic compounds.
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2) If I have an unknown quantity (# of moles) of gas at a pressure of 32 atm, a volume of 70 L, and a temperature of 25˚C. How many moles of gas are in the sample?
Answer:
91.5 mol
Explanation:
Volume of gas = 70 L
Temperature = 25°C
Pressure = 32 atm
Moles of gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
25+273.15 = 298.15 K
By putting values,
32 atm × 70 L = n ×0.0821 atm.L /mol.K × 298.15 K
2240 atm.L = n ×24.48 atm.L /mol
n = 2240 atm.L / 24.48 atm.L /mol
n = 91.5 mol
Balance Nuclear Reaction
94239Pu --> 24He + ________
"The incredible diversity of pterosaurs is perhaps best expressed in one of the
prehistoric flying reptile's most intriguing and mysterious features: the head crest."
What evidence from the text supports the idea that the diversity of pterosaurs is best
expressed in their head crests?
A "Many pterosaurs had flesh-and-bone crests atop their skulls - dramatic
anatomical characteristics whose purpose is still debated by paleontologists."
B "Akin to a rooster's comb, peacock's crown, or the frill on some lizards!
necks, pterosaur crests were prominent anatomical features found across many
species."
C "Pterosaurs crests are thought to have been fairly ubiquitous, appearing in
many groups of pterosaurs from the Triassic (252-201 million years ago)
through the Jurassic (201–145 million years ago) and Cretaceous (145-66
million years ago) periods."
D "Among pterosaur species known to have had crests, there is an amazing
range of shapes and sizes."
Answer:
b
Explanation:
What is the highest main energy level of Cl? How many inner shell electrons does Cl have?
Answer:
The highest energy level in which you would find electrons in a ground state chlorine atom is the third energy level.
Explanation:
The highest energy level in which you would find electrons in a ground state chlorine atom is the third energy level.
Which bond consists of EQUAL sharing of electron pairs between two atoms?
A. Ionic
B. Polar covalent
C. Nonpolar covalent
Answer: Non-polar covalent bond
Explanation: If two atoms have no difference between their electronegativity charges, they will form nonpolar covalent bonds. This means that the electrons will be shared with the same intensity.
Which of the following latitudes receive the most direct solar energy?
A latitudes near the north pole
B latitudes near the south pole
C latitudes near mountain ranges
D latitudes near the equator
Answer:
The answer to your question is D.
Explanation:
The latitudes near the equator receives the most direct solar energy.
Hope this helps :)
A brown rabbit is easily hunted and killed in an arctic ecosystem. Which would be expected to appear most often future generations born in the same ecosystem?
A. brown rabbits
B. gray rabbits
C. white rabbits
D. an even mix of brown, gray, and white rabbits
Answer:
D..................ig
Explain how scientists know the composition of the bottom layer of the crust?
How many atoms are there in 7.80 moles of germanium
4.70 × 10²⁴ atoms Ge
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
BracketsParenthesisExponentsMultiplicationDivisionAdditionSubtractionLeft to RightChemistry
Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
7.80 mol Ge
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]\displaystyle 7.80 \ mol \ Ge(\frac{6.022 \cdot 10^{23} \ atoms \ Ge}{1 \ mol \ Ge} )[/tex] = 4.69716 × 10²⁴ atoms Ge
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
4.69716 × 10²⁴ atoms Ge ≈ 4.70 × 10²⁴ atoms Ge
2. Calculate the mass of Al(SO), in 250 mL of solution if the concentration
is 0.48 N.
Answer:
s
Explanation:
How much iron is present in 1.3400 grams of iron (III) oxide?
Answer:
69.94%
Explanation:
69.94% IRON IS PRESENT
What are the disadvantages of using nonrenewable energy resources?
They are readily available.
They are harmful to the environment.
There is only a certain amount of each source.
They are easy to extract from the earth.
explain why fossil fuels are exhaustible natural resources
Answer:
Fossil Fuels are exhaustible natural resources, because they can't be renewed. Once these fuels are used up, there are NONE left! We can change that by reducing the amount we use. It takes millions of years for it to be remade, and we will soon die out before that happens. Thats why fossil fuels are exhaustible. :)
Explanation:
Hope this helps! :)
Help plzzzzz ASAP!!!!!!!!
1. NaF, Na₂S, Na₃P, Na₂O
2. MgF₂, MgS, Mg₃P₂, MgO
3. AlF₃, Al₂S₃, AlP, Al₂O₃
Further explanationGiven
Ionic charge
Required
The formula of binary ionic compounds
Solution
Ionic compounds consisting of cations (ions +) and anions (ions -)
Ionic compounds usually consist of metal cations and non-metal anions
Metal: cation, positively charged.
Nonmetal: negatively charged
The anion cation's charge is crossed
The ionic compounds :
1. NaF, Na₂S, Na₃P, Na₂O
2. MgF₂, MgS, Mg₃P₂, MgO
3. AlF₃, Al₂S₃, AlP, Al₂O₃
PET plastic # 1 is used in water bottles and pop bottles. Why should they be recycled but not be reused?
They should be recycled but not reused because the "repeated use increases the risk of leaching and bacterial growth." Also, recycling PET plastic "results in reduced energy consumption, lower cost, and reduced environmental impact."
what is FI5 compound name?
Answer:
this is the name for it PENTADECANOIC ACID
Explanation:
I kinda don't understand what you mean by the compound name but this is the scientific name, tell me if it helped :)
What is CO2?????????
Answer: carbon dioxide
Explanation: because it is 1 carbon and 2 oxygen, and two means di-.
Which pair of elements are in the same period on the periodic table?
А
Lithium & Sodium
B
Hydrogen & Potassium
C
Boron & Silicon
D
Sulfur & Argon
1 Produce a time line for the formation of the atmosphere,
starting with the formation of the Earth 4500 million years ago.
2 Use your research skills to find out:
a more about the ozone hole problem
b what precautions are necessary to prevent an increase in
skin cancers.
Pls help!!!!!
Answer:
1) Well I think you need to research that in G00GLE
Explanation:
2 answer
a) The thinning is most pronounced in the polar regions, especially over Antarctica. Ozone depletion is a major environmental problem because it increases the amount of ultraviolet (UV) radiation that reaches Earth's surface, which increases the rate of skin cancer, eye cataracts, and genetic and immune system damage.
b) Seek the shade, especially between 10 AM and 4 PM.
Don't get sunburned.
Avoid tanning, and never use UV tanning beds.
Cover up with clothing, including a broad-brimmed hat and UV-blocking sunglasses.
Use a broad-spectrum (UVA/UVB) sunscreen with an SPF of 15 or higher every day.
Magnetic Quantum Number tells you what? how many orbitals are in s, p ,d?
Given the balanced equation:
2NO2 —————->N2O4
what mass in grams of n2o4 is produced when 10 moles of no2 is consumed?
a) 153 b) 690 c) 368 d) 460 e) 1150
Answer:
d) Mass = 460 g
Explanation:
Given data:
Mass of N₂O₄ produced = ?
Number of moles of NO₂ consumed = 10 mol
Solution:
2NO₂ → N₂O₄
Now we will compare the moles of NO₂ and N₂O₄.
NO₂ : N₂O₄
2 : 1
10 : 1/2×10 = 5 mol
Mass of N₂O₄ produced:
Mass = number of moles × molar mass
Mass = 5 mol × 92 g/mol
Mass = 460 g
Question: Based on this information, which type of light is more likely to damage the material?
1)The gamma ray light is more likely to damage the material because the gamma ray light can
pull energy out of the material when it passes through the material.
b
2)The X-ray light is more likely to damage the material because the X-ray light bounces off of
the material, which means that it has more energy.
3)There is no way to know because they are two different types of light, and different types of
light can change a material in different ways.
4)Neither type of light is likely to damage the material because the material does not take in
energy from either the X-ray light or the gamma ray light.
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Save and Continue
lol
Answer: It will be D which is number 4........
Neither type of light is likely to damage the material, because the material does not take in energy from either the X-ray light or the gamma ray light.
Explanation:
How might the information on melting point, boiling point, and flammability be useful to materials scientists
The information on melting point, boiling point, and flammability might be useful to materials scientists as:
What is Melting point?The temperature for the pure substance at which the liquid and solid phase exist in equilibrium condition
What is Boiling point?The temperature at which the vapour pressure of the liquid is equal to the atmospheric pressure.
What is flammability?Flammability is the ability of a substance such as solid, liquid and gases to ignite in air if source of ignition is applied.
Material scientist apply the knowledge of physical and chemical properties of different compounds to synthesize new product or improve existing ones.
Hence to know the knowledge about melting point, boiling point, flammability might be necessary conditions for material scientist.
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calculate the freezing point of 3.46 gram of a compound X in 160 gram of benzene when a separate sample of X was vaporized it's density was found to be 3.27 gram/liter at 116°c and 773 torr. The freezing point of pure benzene is 5.45°c of Kf=5.1°/m
Answer: The freezing point of 3.46 gram of a compound X in 160 gram of benzene is [tex]4.38^0C[/tex]
Explanation:
The relation of density and molar mass is:
[tex]d=\frac{PM}{RT}[/tex]
where
d = density = 3.27 g/ L
P = pressure of the gas = 773 torr = 1.02 atm (760 torr = 1atm)
M = molar mass of the gas = ?
T = temperature of the gas = [tex]116^0C=(116+273)K=389K[/tex]
R = gas constant = [tex]0.0821Latm/Kmol[/tex]
[tex]M=\frac{dRT}{P}=\frac{3.27g/L\times 0.0821Latm/Kmol\times 389K}{1.02atm}=102.3g/mol[/tex]
The relation of depression in freezing point with molality:
[tex]\Delta T_f=k_f\times m[/tex]
[tex]\Delta T_f[/tex] = depression in freezing point = [tex]T_f^0-T_f[/tex] = [tex]5.45-T_f[/tex]
[tex]k_f[/tex] = freezing point constant = 5.1
m = molality = [tex]\frac{\text {moles of X}}{\text {weight of solvent in kg}}=\frac{3.46\times 1000}{102.3\times 160}=0.21[/tex]
[tex]5.45-T_f=5.1\times 0.21[/tex]
[tex]T_f=4.38^0C[/tex]
Thus the freezing point of 3.46 gram of a compound X in 160 gram of benzene is [tex]4.38^0C[/tex]
From the information contained in the question, the freezing point of the solution is 4.38°C.
The molar mass of the compound can be obtained from;
M = dRT/P
Where;
d = Density of the gas = 3.27 gram/liter
R = molar constant = 0.082 atmL-K-1mol-1
T = Absolute temperature = 389 K
P = pressure = 773 torr or 1.02 atm
M = 3.27 gram/liter × 0.082 atmL-K-1mol-1 × 389 K/1.02 atm
M = 102.3 g/mol
Number of moles of X = 3.46 gram/102.3 g/mol = 0.034 moles
Molality of the solution = Number of moles of solute/ Mass of solution in kilograms = 0.034 moles/0.16 = 0.21 m
Using the relation;
ΔT = K m i
Where;
ΔT = Freezing point depression
K = Freezing constant = 5.1°C/m
m = molality of solution = 0.21 m
i = Van't Hoff factor = 1
ΔT = 5.1°C/m × 0.21 m × 1
ΔT = 1.07 °C
But;
ΔT = Freezing point of pure solvent - Freezing point of solution
Freezing point of solution = Freezing point of pure solvent - ΔT
Freezing point of pure solvent = 5.45°C
Freezing point of solution = 5.45°C - 1.07 °C
Freezing point of solution = 4.38°C
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which of the following is an example of a longitudinal wave
Answer:
Examples of longitudinal waves include: sound waves. ultrasound waves. seismic P-waves.
Explanation:
How many moles of oxygen are required to produce 12 moles of water?
Answer:
6 moles of Oxygen required
Answer:
6
Explanation:
I hope this helps with your question :)
