Scandium has 21 electrons, which are distributed according to its electronic configuration ([Ar] 3d¹4s²).
Explanation:The number of electrons in an atom of scandium (Sc) is equal to its atomic number, which is 21. The electronic configuration of scandium is [Ar] 3d¹4s², denoting that there are 2 electrons in the 4s orbital and 1 electron in the 3d orbital, after the argon core.The number of electrons in an atom of scandium (Sc) is equal to its atomic number, which is 21. Scandium is a transition metal and it is important to know that in its ionic form (Sc³+), it loses the 3 outer electrons and assumes an electronic structure similar to argon.
Learn more about Scandium Electrons here:https://brainly.com/question/42032919
#SPJ2
Which of the following statements about Dalton’s atomic theory is true?
Dalton’s theory recognized that all matter is composed of atoms.
Dalton’s theory recognized the existence of smaller particles within atoms.
Dalton’s theory did not account for the similarities of atoms of the same element.
Dalton’s theory stated that atoms could not combine with each other.
We have to get the true statement about Dalton's atomic theory.
The true statement is: Dalton’s theory recognized that all matter is composed of atoms.
According to Dalton's atomic theory, all matter is made of atoms and atoms are indivisible and not destructible. So, the statement -Dalton’s theory recognized that all matter is composed of atoms- is true whereas the statement - Dalton’s theory recognized the existence of smaller particles within atoms is false.
As per Dalton's theory, all atoms of a given elements are identical in mass and properties, so the statement -Dalton’s theory did not account for the similarities of atoms of the same element is false.
Also, compounds are formed by a combination of two or more different kinds of atoms hence the statement - Dalton’s theory stated that atoms could not combine with each other is false.
Answer:
evidence that some kinds of matter are made up of waves instead of particles
observations that cannot be explained by the theory
Explanation: these ones are right trust
Which answer describes a chemical reaction in equilibrium?
1. the reactants are all used up
2. all the product is formed
3. the forward and reverse reactions have ceased
4. the forward and reverse reaction rates are the same
Answer is: 4. the forward and reverse reaction rates are the same.
The reaction rate is the speed at which reactants are converted into products.
The formation constant can be calculated when chemical equilibrium is reached, when the forward reaction rate is equal to the reverse reaction rate.
In a chemical reaction, chemical equilibrium is the state in which both reactants and products are present in concentrations which have no further tendency to change with time.
Reaction rates of the forward and backward reactions are equal and there are no changes in the concentrations of the reactants and products.
The density of red wine is 1.01g/cm3 and the density of olive oil is 0.92g/cm3.A salad dressing that consisted of these two ingredients was left sitting too long.The ingredients separated in the bottle ,which ingredient is which layer?Explain.
the red wine is the densest so, it will be on bottom olive oil will be on the top. because its less than the red wine
Which statement about chemical reactions is not true?
The ways in which atoms are joined together are changed.
The starting substances are called reactants.
The bonds of the reactants are broken and new bonds of the products are formed. New atoms are formed as products.
The chemical reaction is the process in which one or more reactants are converted into one or more than one product. The statement about chemical reactions is not true is new atoms are formed as products.
What is chemical reaction ?In a chemical reaction, one or more materials known as reactants are changed into one or more additional substances also known as products. Chemical elements or chemical compounds make up substances.
When one or more chemicals are transformed into one or more other compounds, a chemical reaction takes place. Example: the formation of rust when iron and oxygen combine. Sodium acetate, carbon dioxide, and water are produced when vinegar and baking soda are combined.
As long as the mass of the reactants before the reaction is equal to the mass of the products after the reaction, mass is conserved in chemical reactions even when new products are formed.
Thus, Option D is correct.
To learn more about chemical reaction follow the link below;
https://brainly.com/question/3461108
#SPJ3
PLEASEEEEE HELPPPP (ALL MY POINTS)
A natural gas stove transforms R energy into P energy.
What do R and P most likely represent?
A.) R represents chemical energy, P represents thermal energy
B.) R represents thermal energy, P represents chemical energy
C.) R represents potential energy, K represents electrical energy
D.) R represents electrical energy, K represents potential energy
A.) R represents chemical energy, P represents thermal energy
explanation: Gas is chemical. So when you turn on the gas stove the chemical comes out and then ignite and then after that fire appears and that is a thermal energy
Answer:
A.
Explanation:
Because gas is a chemical and it gets transferred into thermal because of a small flint making fire which is heat or thermal energy.
How many moles are equal to 89.23 g of calcium oxide
the molecular formula of calcium oxide - CaO
The molar mass of CaO - 40 + 16 = 56 g/mol
Which means that 1 mol weighs 56 g
Therefore 56 g of CaO is - 1 mol
Then 89.23 g is equivalent to - 1/56 x 89.23 = 1.6 mol of CaO.
Final answer:
To find the number of moles in 89.23 g of calcium oxide, divide the mass by the molar mass of CaO, which is 56.0 g/mol, resulting in approximately 1.5934 moles.
Explanation:
To calculate the number of moles equivalent to 89.23 grams of calcium oxide (CaO), one must use the molar mass of CaO as a conversion factor. The molar mass of CaO, where calcium (Ca) has an atomic mass of 40.0 u and oxygen (O) has an atomic mass of 16.0 u, is 40.0 g/mol + 16.0 g/mol = 56.0 g/mol.
The number of moles of CaO can be determined by dividing the given mass by the molar mass:
Number of moles of CaO = (mass of CaO) / (molar mass of CaO)
= 89.23 g / 56.0 g/mol
= 1.5934 moles
Therefore, 89.23 grams of calcium oxide are equal to approximately 1.5934 moles of CaO.
Which is the chemical formula for iron(II) chloride tetrahydrate? A. FeCl2•4H2O B. FeCl3•6H2O C. FeCl2•3H2O D. FeCl3•4H2O
I would have to say A. FeCl2•4H2O
I hope this helps!
Cheers, July. :)
What is the empirical formula of a compound that breaks down into 4.12g of N and 0.88g of H? Please explain why.
Answer:
nh3
Explanation:
It is widely known that fossil fuels pollute the environment and cause harmful effects. Why then are fossil fuels still being widely used?
1. not enough of society knows the harmful nature of fossil fuels
2. cost-effective alternatives are not yet ready to replace fossil fuels
3. alternative fuels offer just as many environmental problems as fossil fuels
4. the demand for alternative fuels cannot be met by current manufacturers
Fossil fuels are still being widely used because of the fact that the demand for alternative fuels cannot be met by current manufacturers.
Answer:
cost-effective alternatives are not yet ready to replace fossil fuels; they are the cheapest resource, especially oil.
Four students presented different analogies to describe the formation of an ionic bond.
Student A: Two countries using a common waterway for navigation
Student B: A small dog and a big dog tugging at a bone with equal strength
Student C: Two neighbors carpooling to work
Student D: Assets of a small company being taken over by a large company
Which student presented a correct analogy?
The correct student would be student D since an ionic bond is made up of a metal and nonmetal where metals usually give electrons and nonmetals take.
Answer is: Student D: Assets of a small company being taken over by a large company.
Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).
For example, compound magnesium chloride (MgCl₂) has ionic bond.
In this example, chlorine is large company, because it has greater electronegativity than magnesium (small company) and take electrons (assets) from it.
Magnesium (Mg) transfers two electrons, became positive cation, to chlorine (Cl), which became negative anion.
Magnesium is metal from group 2 and chlorine is nonmetal from group 17 of the Periodic table.
Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.
Suppose you use 0.0150 liter of a 2.50 M solution of silver nitrate. Assuming the reaction goes completion how much silver sulfide is produced
M= Moles/ L
2.50=x/0.0150
x=0.0375 moles
moles x mm= grams
0.0375 x 247.8= 9.2925 grams
the answer is
C. 9.30 g
who is known as the "Father of Medicine." A. Galen B. Aristotle C. Galileo D. Hippocrates
D. Hippocrates
As quoted from Wikipedia, "he is often referred to as the "Father of Medicine"[1] in recognition of his lasting contributions to the field as the founder of the Hippocratic School of Medicine."
I hope this helps!
Cheers, July.
what is the molarity of 60 grams of NaOh dissolved in 750
Answer:
Here we need to find the morality of 60 grams of NaOH dissolved in 750ml because the amount of solute is usually taken in ml and 750 litres is way to high.
So, coming towards the question, we need to find molarity.
As we know, molarity is no of moles of a substance per litre of the solution.
Molarity= mole\volume ----> 1
Now we will change 750ml to litres
750/1000 = 0.75 litres
Now we need to find no of moles of NaOH.
As we know, no of moles = mass /molar mass
no of moles =60 grams / 40
no of moles= 1.5 moles
Putting the values of no of moles and volume in equation 1
Molarity= mole\volume ----> 1
=1.5 moles/ 0.75 litres
=2 M
So the answer will be 2 Molar.
How to determine the amount of electrons transferred in a redox reaction
The amount of electrons transferred depends on how many electrons an element gains/loses. Metals normally lose electrons and nonmetals gain electrons to attain a total of 8 electrons.
Which of these would have the LEAST amount of inertia? A. a car B. a building C. a gold brick D. a moving car
Answer: (c) a gold brick would have the least amount of inertia.
The inertia of an object refers to its ability to continue in its present state of rest or uniform motion until any external force act of the body to change its state of motion.
The inertia of a body increases with its mass. For this reason, a body with more mass and high inertia needs larger force to change its state of motion or rest. Among the given objects, the mass of a gold brick is the least. For this reason, it would have the least amount of inertia and least amount of force is required to change its state of motion or rest.
Describe how to write the Ksp.
b2+ + 2 NO3- + 2 Na+ + 2 I- >> PbI2 (s) + 2 Na+ + 2 NO3-
net ionic
Pb2+ + 2 I- >> PbI2
Ksp = [Pb2+] [I-]^2
Ksp = 7.1 x 10^-9
molar solubility
let x = mol/L of Pb2+ that dissolve . This will give x mol/L Pb2+ and 2x mol/L I-
7.1 x 10^-9 = (x) (2x)^2 = 4x^3
molar solubility = 0.0012 M
~~thanks to google research~~
is water an element compound or mixture
Final answer:
Water is classified as a compound because it consists of hydrogen and oxygen atoms bonded in a fixed ratio, represented by the chemical formula H2O. Elements contain only one type of atom, and mixtures combine substances without forming new chemical bonds.
Explanation:
Water is a compound, not an element or a mixture. This is because it is composed of hydrogen and oxygen atoms in a fixed ratio. To be more precise, a water molecule consists of two hydrogen atoms bonded to one oxygen atom, which can be represented by the chemical formula H2O. Molecules of elements contain only one type of atom, whereas molecules of compounds, like water, contain two or more types of atoms bonded together in a specific geometric arrangement.
In contrast, a mixture is a combination of two or more substances that maintain their own chemical identities, and they do not bond chemically to form a new compound. For example, air is a mixture of nitrogen, oxygen, argon, and carbon dioxide, among other gases.