Answer:
False
Explanation:
Atomic radius is defined as the distance between the nuclei of 2 identical atoms that are bonded together
Now, from periodic tables, chromium has a calculated atomic radius of 1.66 Å while iron has a calculated atomic radius of 1.56 Å
Thus, chromium has a bigger atomic radius than iron.
So the statement is false.
Which of the following is an
example of physical change?
1) A Halloween light stick glows after shaking
2) An oxygen balloon explodes when contacted with a flame.
3) browning meat
4) Steam condensed on the mirror after taking a shower.
5) None of the above is a physical change.
Answer:
2 and 4
Explanation:
The rest of the changes are chemical. 1 has a chemical reaction happen which makes light sticks glow. 3 is because browning the meat actually causes some new compounds to form and cause caramelization.
For 2, the oxygen is simply heating up and expanding which pops the balloon. 4 is just a phase change of water vapor to liquid water.
How is thermal energy being transferred when steam rises from a beaker of boiling water?
Answer: The answer is C! Convection.
Explanation:
Apex!! Convection is thermal energy through water, and vapor is still a form of water.
Answer:
c. convection
Explanation:
AP-EX
explain how carbon and oxygen form carbon dioxide
Answer:
Carbon dioxide, or CO2, is a naturally occurring linear compound composed of two oxygen atoms covalently bonded to a carbon atom. The two C=O. Carbon DioxideA central carbon atom is connected to two oxygen atoms via double bonds in a linear structure.
Explanation:
Help? Will mark as brainlist!!
Answer:
1. 4.75
2. 5.50
Explanation:
What is the volume in mL of .00024 moles of mercury? The density of mercury is 13.6 g/mL.
Answer : 3.53x10⁻³ ml
Further explanationDensity : the ratio between mass and volume
Can be formulated :
[tex]\tt \boxed{\bold{\rho=\dfrac{m}{V}}}[/tex]
ρ = density, kg/m³ or g/ml
m = mass, kg or g
V = volume = m³ or ml
While mol : dividing mass with molar mass(MW=molecular weight)
[tex]\tt n=\dfrac{mass}{MW}[/tex]
n= mol
mass = grams
MW = molecular weight ,g/mol
Knownmoles : 0.00024 moles of Mercury(Hg)
MW of Hg = 200,59 g/mol
so the mass of Mercury :
[tex]\tt mass=moles\times MW\\\\mass=0.00024\times 200,59\\\\mass=0.048~g[/tex]
Because the density of Mercury is 13.6 g/mL, then the volume :
[tex]\tt V=\dfrac{mass}{density}\\\\V=\dfrac{0.048~g}{13.6~g/ml}\\\\V=\boxed{\bold{3.53\times 10^{-3}ml}}[/tex]
When a metal atom gains electrons it forms an anion.
Always true
Sometimes true
Never true
What happens in a chemical change that does not occur in a physical change?
Answer:
In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition. Although we call them physical "reactions," no reaction is actually occurring.
How many moles are in 25.3 g of a sample of potassium nitrate (KNO3)?
Answer:
25.3 g of KNO₃ contain 0.25 moles.
Explanation:
Given data:
Number of moles of KNO₃ = ?
Mass of KNO₃ = 25.3 g
Solution:
Formula:
Number of moles = mass/ molar mass
Molar mass of KNO₃:
KNO₃ = 39 + 14+ 16×3
KNO₃ = 101 g/mol
Now we will put the values in formula.
Number of moles = 25.3 g/ 101 g/mol
Number of moles = 0.25 mol
Thus, 25.3 g of KNO₃ contain 0.25 moles.
which best describes matter?
Answer:
matter is anything that has mass and takes up space
Explanation:
what is the amount of electrical energy utilized in moving the electrons from one terminal point in a battery called
Answer:
Explanation:
In a similar way charged particles such as electrons need to have work done to move them from one point to another. The amount of work per unit of charge is called is called the electric potential difference between the two points. The unit of potential difference is called the volt.
If an element has an atomic number of 8 and an atomic mass number of 18, would it be an isotope? Why or why not?
Answer:
It would be an isotope.
Background Information:
Isotopes are typically elements that have a different number of protons than neutrons. The atomic mass is the total number of protons and neutrons. The atomic number is the number of protons.
Explanation:
If the atomic number is the number of protons that means that this particular element has 8 protons. If the atomic mass is the total number of protons and neutrons then we can simply take away the amount of protons from that number, 18 - 8 = 10. If we take protons away from the number of protons and neutrons we are left with the number of neutrons. So there are 10 neutrons. Because there are 8 protons and 10 neutrons, or a different amount of neutrons and protons we know that this particular atom is an isotope.
It would be an isotope.
IsotopeIsotopes are elements that have the same number of electrons and protons but different numbers of neutrons. The atomic mass is the total number of protons and neutrons. The atomic number is the number of protons.
If the atomic number is the number of protons that means that this particular element has 8 protons. If the atomic mass is the total number of protons and neutrons then protons
18 - 8 = 10
If we take protons away from the number of protons and neutrons we are left with the number of neutrons. So there are 10 neutrons. Because there are 8 protons and 10 neutrons, or a different amount of neutrons and protons. So, the particular atom is an isotope.
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is CaCl2 lonic or
Covalent
Answer:
Ionic
Explanation:
Ionic compounds generally form between elements that are metals and elements that are nonmetals. For example, the metal calcium (Ca) and the nonmetal chlorine (Cl) form the ionic compound calcium chloride (CaCl2).
A 25.3-8 sample of an unknown compound contains
0.8 g of oxygen. What is the percent by mass of
oxygen in the compound?
The percentage by mass of oxygen in the 25.3 g sample of the unknown compound is 3.16%
From the question given above, the following data were obtained:
Mass of compound = 25.3 g
Mass of oxygen = 0.8 g
Percentage of oxygen =?The percentage of oxygen in the compound can be obtained as follow:
[tex]Percentage = \frac{mass of element}{mass of compound } *100[/tex]
Percentage of oxygen = [tex]\frac{0.8}{25.3} * 100[/tex]
Percentage of oxygen = 3.16%Thus, the percentage of oxygen in the compound is 3.16%
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Given the mass number and atomic number, how do you determine the number of neutrons?
Answer:
You subtract the given atomic mass by the atomic number
Explanation:
The answer is the explanation
I really l need help with this question
Answer:
A
Explanation:
The skin, mucous membranes, and endothelia throughout the body serve as physical barriers that prevent microbes from reaching potential sites of infection. Tight cell junctions in these tissues prevent microbes from passing through.
Hope this helps:)
What is true about the energy differences between electron orbitals in particular atoms?
Answer: When in a magnetic field, the two electrons in a particular orbital differ very slightly in energy because of a property called electron spin. The theory of electron spin states that the two electrons in a single orbital spin in opposite directions on their axes, causing an energy difference between them
Explanation: I hope this helps!
Which of the following is the ground state electron configuration of Ni?
Answer:
Nickel atoms have 28 electrons and the shell structure is 2.8. 16.2. The ground state electron configuration of ground state gaseous neutral nickel is [Ar]. 3d8.
Explanation:
Sodium bicarbonate is the chemical name for baking powder. Its chemical formula is NaHCO3. What does the subscript 3 mean?
A.
There are three molecules of sodium bicarbonate.
B.
There are three molecules of oxygen in sodium bicarbonate.
C.
There are three atoms of oxygen in sodium bicarbonate.
D.
There are three atoms of sodium bicarbonate.
Answer:
A
Explanation:
Farmers recently have started to use a lot of fertilizer on farms. Extra fertilizer runs off the farms, into the rivers, and out into the oceans. Which of the following would be a likely outcome of this?
A) Animals will use the fertilizer to grow.
B) Kelp on the bottom of the ocean will grow.
C) Coral reefs will grow faster.
D) Algae will grow, causing algae blooms.
answer:
d) algae will grow, causing algae blooms
explanation:
changes in the environment create algae blooms. (ie. excessive use of fertilizer)
https://quizi-zz.com/admin/quiz/5d78f527bbbbcc001ac835d2/ecosystems
good luck :)
i hope this helps
have a great day!
Extra fertilizer runs off the farms, into the rivers, and out into the oceans. Algae will grow, causing algae blooms. Therefore, the correct option is option D.
What is fertilizer?Any substance of either synthetic or natural origin applied to soil or plant tissues to provide plant nutrients is referred to as a fertilizer or fertiliser. It's possible to distinguish fertilizers from liming agents and other non-nutrient soil additives. There are numerous natural and man-made sources of fertilizer.
With the exception of the sporadic inclusion of supplements such rock flour for micronutrients, fertilization for the majority of modern agricultural techniques concentrates on the three basic macronutrients of nitrogen (N), phosphorous (P), plus potassium (K). Farmers recently have started to use a lot of fertilizer on farms. Extra fertilizer runs off the farms, into the rivers, and out into the oceans. Algae will grow, causing algae blooms.
Therefore, the correct option is option D.
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If the volume of oxygen gas is 259 cm3 at 112 kPa, what would the volume be at 101.3 kPa?
Answer:
The answer is 286.36 cm³Explanation:
In order to find the volume be at 101.3 kPa we use Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the final volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\ [/tex]
From the question
P1 = 112 kPa = 112000 Pa
V1 = 259 cm³
P2 = 101.3 kPa = 101300 Pa
We have
[tex]V_2 = \frac{112000 \times 259}{101300} = \frac{29008000}{101300} \\ = 286.3573543...[/tex]
We have the final answer as
286.36 cm³Hope this helps you
The number of valence electrons in an element affects the reactivity
of that element. Which element listed has the fewest valence
electrons?
Select one:
neon (Ne)
sodium (Na)
beryllium (Be)
oxygen (0)
Answer:sodium
Explanation:
Sodium is the element that has the fewest valence electrons. The correct option is B.
What is valance electron?A valence electron is an electron associated with an atom in the outer shell that can take part in the formation of a chemical bond if the surface layer is not closed.
Both atoms in a single covalent bond contribute one valence electron to form a shared pair.
Valence electrons are electrons in an atom's outermost shell, or energy level. For example, oxygen has six electron, two of which are in the 2s subshell and four of which are in the 2p subshell.
Because the highest energy 3s orbital has one electron, neutral sodium atoms have one valence electron.
Thus, the correct option is B.
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What does the law of the kinetic theory state?
How are protons, neutrons be, and electrons similar?
Answer:
This is how
Explanation:
Protons and neutrons have approximately the same mass, but they are both much more massive than electrons (approximately 2,000 times as massive as an electron). The positive charge on a proton is equal in magnitude to the negative charge on an electron.
Answer: They are all subatomic particles that make up an atom.
Which of the following is the name given to protons electrons and neutrons?
what is the lewis structure for RnF2
Answer:
E3 ubiquitin-protein ligase RING2 is an enzyme that in humans is encoded by the RNF2 gene.
Explanation:
Lewis structure of Radon difluoride has three lone pairs and two bonding pairs.
What is Lewis structure?Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, are diagrams that depict the bonding between atoms in a molecule, as well as any lone pairs of electrons that may be present. It's used to depict how electrons in a molecule are distributed around specific atoms. Electrons are shown as "dots" or as a line between two atoms when they are bonded.
Hence, Lewis structure of Radon difluoride is
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is a nuclear reactor an example of fusion or fission?
Answer:
fission
Explanation:
If you don't keep giving a car gas, the car will eventually stop. *
Newton's 1st Law
Newton's 2nd Law
Newton's 3 Law
Law of Universal Gravitation
Law of Conservation of Momentum
Answer:
newtons 2nd law is the answer
the density of an object is 4.78 g/ml . if the object has a mass of 2.34. determine the volume of the object
Answer:
The answer is 0.49 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question
mass = 2.34 g
density = 4.78 g/mL
We have
[tex]volume = \frac{2.34}{4.78} \\ = 0.4895397...[/tex]
We have the final answer as
0.49 mLHope this helps you
When you place a glass over a candle and the flame goes out, the limiting reactant is, oxygen wax energy water
Answer:
oxygen
Explanation:
Putting the jar over the candle keeps oxygen from outside the jar from getting in. The reaction can only use the oxygen that is already in the jar. So, when that oxygen is used up, the reaction can't keep going. Running out of oxygen makes the flame go out.
What happens to wax when you burn a candle?
The heat of the flame vaporizes the liquid wax (turns it into a hot gas), and starts to break down the hydrocarbons into molecules of hydrogen and carbon. These vaporized molecules are drawn up into the flame, where they react with oxygen from the air to create heat, light, water vapour (H2O) and carbon dioxide (CO2).
What type of reaction is burning candle wax?Combustion
And when you light a candle you use the candle's wax as fuel for a chemical reaction called combustion which involves reacting hydrocarbons with oxygen, breaking them down into carbon dioxide and water.
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Plz help!
What is 1 item that is an element?
Give an example of how the 1 item is an element
Oxygen
Oxygen is considered an element because it cannot be broken down any farther.