Answer:
Calcium
Explanation:
Periodic table
А group of students are investigating what happens when you put different
temperatures of water together. In this investigation, they have set up a vial
of colorless room-temperature water and are adding purple hot water at the
bottom of the vial, using a pipette
What do you predict happens in the first 5 seconds.
Answer:
B. The hot water mixes all through the vial
Explanation:
The hot water is able to mix all through the vial because when water is heated, it's molecule are loosed. They are able to speed up and spread, occupying a larger volume. Hot water is less dense than room-temperature water and the hot water can float on room-temperature water.
Convert 9.13 decigram into milligram
Answer:
(9.13)
multiply the mass value by 100
=913 milligrams
Answer:
913 mg
Explanation:
913
electrictron configuration
Explanation:
So what do you wanna know? The definition?
In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s² 2s² 2p⁶, using the notation explained below.
The graph below represents the relationship between the distance traveled and time elapsed for an object in motion.
During which interval is the speed of the object changing?
Group of answer choices
BC
DE
Answer:
DE
Explanation:
BC has a constant speed of 0, and DE does not have a consistent slope, therefore the speed is changing
The speed is defined as the rate of change of distance with respect to time.
In interval DE , speed of the object is changing.
Since, speed is defined as the rate of change of distance with respect to time.
[tex]v=\frac{dx}{dt}[/tex] , where x represent distance.
Slope of given graph represent distance, In interval BC slope is constant.
In interval, DE slope is always changing at each point.
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Imagine you are a lab technician, and a colleague informs you there have been problems with the 25.0-mL samples you have been providing. You know you have been measuring the volume carefully and reading the meniscus correctly, so you decide to check the calibration of the graduated cylinder you have been using. You fill the graduated cylinder with water at 25 °C up to the 25.0 mL mark, and then measure the mass of this volume of water. You find that the mass is 22.4 g. The density of water at 25 °C is 0.99704 g/mL. What is the actual volume of the water?
Answer:
22.5mL is the volume of the water
Explanation:
When the graduated cylinder is in the 25.0mL mark, the mass of this volume is 22.4g. To convert this mass to volume we need to use density, as follows:
22.4g × (1mL / 0.99704g) = 22.5mL is the volume of the water.
That means the cylinder is uncalibrated in 2.5mL when the cylinder is in the 25.0mL mark
Describe what type of electron transfer happens between these two atoms.
Answer:
Magnesium loses it's two electrons and Oxygen gains two electrons. Magnesium is now a cation and Oxygen is now an anion. Both become stable.
Explanation:
The type of electron transfer which happens between the Mg and O atom is a complete transfer of electrons from the Mg atom to the O atom in an ionic bond.
As we know, Ionic bonding is a type of chemical bonding characterized by the complete transfer of electrons from one atom to the other.The most electropositive electron usually is usually the donor while the most electronegative elements is the acceptor.
As evident in the case above;
Mg, which is the electropositive element with 2 Valence electrons loses its Valence electrons to become Mg²+.O, which is the electronegative element with 6 Valence electrons, and consequently, only needs 2 electrons to complete it's octet.Ultimately, an ionic bond is formed between the Mg and O atoms.
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What volume of water (in mL) is required to prepare a 3.000 M solution by dissolving 43.83 g of of NaCl.
Select one:
a. 250.0 mL
b. 2500.0 mL
c. 2.50 mL
d. none of these
e. 25.0 mL
Answer:
Option A. 250 mL
Explanation:
From the question given above, the following data were obtained:
Molarity of NaCl = 3 M
Mass of NaCl = 43.83 g
Volume of water =..?
Next, we shall determine the number of mole in 43.83 g of NaCl. This can be obtained as follow:
Mass of NaCl = 43.83 g
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mole of NaCl =?
Mole = mass/molar mass
Mole of NaCl = 43.83/58.5
Mole of NaCl = 0.749 mole
Next, we shall determine the volume of water required to prepare the solution as follow:
Mole of NaCl = 0.749 mole
Molarity of NaCl = 3 M
Volume of water =..?
Molarity = mole /Volume
3 = 0.749 /volume
Cross multiply
3 × volume = 0.749
Divide both side by 3
Volume = 0.749/3
Volume = 0.25 L
Finally, we shall convert 0.25 L to millilitres (mL). This can be obtained as follow:
Recall:
1 L = 1000 mL
Therefore,
0.25 L = 0.25 L × 1000 mL / 1 L
0.25 L = 250 mL
Therefore, 0.25 L is equivalent to 250 mL.
Thus, the volume of water needed to prepare the solution is 250 mL
Mass is a unique property of any property.
Calculate the number of total atoms in 195 grams of Ni(OH)2. Use 6.022x10^23mol-1 for Avogadro’a number
195 g×
1 mol
Ni(OH)
2
92.71
g Ni(OH)
2
×
6.022×
10
23
formula units
mol
=1.27×
10
24
formula units of Ni(OH)
2
Since there are
5
atoms—one
Ni
atom, two atoms of
O
and two atoms of
H
—in each formula unit of
Ni(OH)
2
,
we multiply the number of formula units calculated above by
5
:
1.27×
10
24
formula units of Ni(OH)
2
×
5 atoms
formula unit of Ni(OH)
2
=6.33× 10^ 24 total atoms
The number of total atoms in 195 grams of [tex]Ni(OH)_2[/tex] is[tex]6.30\times 10^{24}[/tex] atoms
Explanation:
Given:
The 195 grams of nickel(II) hydroxide,[tex]Ni(OH)_2[/tex] .
To find:
The total number of atoms in 105 grams of nickel(II) hydroxide.
Solution:
The mass of nickel(II) hydroxide = 195 g
The molar mass of nickel(II) hydroxide = 92.708 g/mol
The moles of nickel(II) hydroxide:
[tex]=\frac{195 g}{92.708 g/mol}=2.10 mol[/tex]
According to the mole concept:
1 mole =[tex]N_A=6.022\times 10^{23} mol^{-1}[/tex]
The number of molecules of nickel(II) hydroxide =
[tex]N=2.10 mol\times 6.022\times 10^{23} mol^{-1} =1.26\times 10^{24} molecules[/tex]
In 1 molecule of nickel(II) hydroxide there is 1 nickel atom, then in N molecules of nickel(II) hydroxide:
[tex]=1\times 1.26\times 10^{24} atom=1.26\times 10^{24} atoms[/tex]
In 1 molecule of nickel(II) hydroxide there are 2 oxygen atoms, then in N molecules of nickel(II) hydroxide:
[tex]=2\times 1.26\times 10^{24} atom=2.52\times 10^{24} atoms[/tex]
In 1 molecule of nickel(II) hydroxide there are 2 hydrogen atoms, then in N molecules of nickel(II) hydroxide:
[tex]=2\times 1.26\times 10^{24} atom=2.52\times 10^{24} atoms[/tex]
The total number of atoms:
[tex]=1.26\times 10^{24} atoms+2.52\times 10^{24} atoms+2.52\times 10^{24} atoms=6.30\times 10^{24} atoms[/tex]
The number of total atoms in 195 grams of [tex]Ni(OH)_2[/tex] is[tex]6.30\times 10^{24}[/tex] atoms.
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If the hydrogen atom emits red, blue-green, blue, and violet light, how many energy levels does it have in the visible region of the spectrum?
A. 3
B. 4
C. 5
D. 6
Answer:
The correct answer is - option B. 4.
Explanation:
The visible spectrum of light emitted by a sample of active or excited hydrogen atoms splits into four wavelengths that are basically four distinct levels of energy in the visible region of the spectrum. There four different wavelengths are 410 nm, 434 nm, 486 nm, and 656 nm.
These shows for colors according to the spectrum and wavelength violet, blue, green, and red, where 656 nm wavelength is most intense on the spectrum.
If a hydrogen atom emits red, blue-green, blue, and violet light, the number of energy levels it has in the visible region of the spectrum is: B. 4
An electromagnetic spectrum can be defined as a range of frequency and wavelength that an electromagnetic wave is distributed (extends).
Generally, the electromagnetic spectrum comprises the following:
Gamma rays.Visible light.Ultraviolet radiation.X-rays.Radio waves.Infrared radiation.When the atom of an element emits a radiation, each color of the radiation represents an energy level within the visible region of the electromagnetic spectrum.
Since the hydrogen atom emitted four colors (red, blue-green, blue, and violet light), it has four (4) energy levels in the visible region of the electromagnetic spectrum.
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Identify each term as a description of an electron geometry or a molecular geometry. Trigonal pyramidal for N F 3 Choose... Tetrahedral for N F 3 Choose... Arrangement of bonding and non-bonding electron domains Choose... Arrangement of only the atoms in a molecule Choose...
Answer:
electron geometry
Tetrahedral for N F 3
Arrangement of bonding and non-bonding electron domains
molecular geometry
Trigonal pyramidal for N F 3
Arrangement of only the atoms in a molecule
Explanation:
According to valence shell electron pair repulsion theory, the shape of a molecule is determined by the number of electron pairs on the valence shell of the central atom in the molecule.
The electron pair geometry refers to the arrangement of bonding and non-bonding electron domains. For NF3, the electron geometry is tetrahedral.
The molecular geometry refers to the arrangement of only the atoms in a molecule. For NF3, the molecular geometry is trigonal pyramidal.
NF₃ has different geometry as per the arrangements of electrons. Tetrahedral and Trigonal bipryamidal are the two geometries.
According to valence shell electron pair repulsion theory:The shape of a molecule is determined by the number of electron pairs on the valence shell of the central atom in the molecule.
Electron geometry
Tetrahedral for NF₃
Arrangement of bonding and non-bonding electron domains
Molecular geometry
Trigonal pyramidal for NF₃
Arrangement of only the atoms in a molecule
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According to the octet rule, an atom is usually stable when it has _____ valence electrons.
A. 4
B. 8
C. 6
D. 10
Answer:
B. 8
Explanation:
PLEASE HELPPP!!!!!!!!
Explanation:
Label A: oceanic - oceanic
Label B: oceanic - continental
Label C: continental - continental
Answer:
Oceanic-continental convergence---- letter B.
Oceanic-oceanic convergence ---- letter A.
Continental-continental convergence ---- letter C
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How many oxygen atoms are in H2SO4?
plzzz help hahsbhd db question 5
Answer:
chemical reactions
Explanation:
Answer:
chemical reactions
Explanation:
Chemical reactions like weathering can cause rock and earth movement, plants grow from rain which is weathering, snow is weathering and cold winters is freezing water. I don't see how flowing water can contribute to weathering because in rivers, creeks, etc, always flowing. So if flowing water is always moving, it's not caused by weathering.
I EDITED MY ANSWER:
Physical weathering is caused by purely mechanical changes to the rock, while chemical weathering is caused by chemical reactions. The answer is chemical reactions
In a hot shower or steam room, you look up at the ceiling. What do you observe on the ceiling and why?
Which statement best explains why the overall charge on an atom is zero?
Answer:
which statements
Explanation:
Answer:
The positive charge of the protons in the nucleus equals the negative charge in the electron cloud.
Explanation:
I just took the assignment.
Which of the following cannot be read directly from the periodic table?
an element's atomic mass
an element's number of neutrons
an element's symbol
an element's number of protons
Problem PageQuestion Nitric acid and nitrogen monoxide react to form nitrogen dioxide and water, like this: (aq)(g)(g)(l) At a certain temperature, a chemist finds that a reaction vessel containing a mixture of nitric acid, nitrogen monoxide, nitrogen dioxide, and water at equilibrium has the following composition: compound amount Calculate the value of the equilibrium constant for this reaction. Round your answer to significant digits. Clears your work. Undoes your last action. Provides information about entering answers.
Answer:
3.4
Explanation:
Nitric acid and nitrogen monoxide react to form nitrogen dioxide and water, like this: 2 HNO₃(aq) + NO(g) ⇄ 3 NO₂(g) + H₂O(l)
At a certain temperature, a chemist finds that a 9.5L reaction vessel containing a mixture of nitric acid, nitrogen monoxide, nitrogen dioxide, and water at equilibrium has the following composition:
compound amount
HNO₃ 15.5g
NO 16.6g
NO₂ 22.5g
H₂O 189.0g
Calculate the value of the equilibrium constant Kc for this reaction. Round your answer to 2 significant digits.
Step 1: Write the balanced equation.
2 HNO₃(aq) + NO(g) ⇄ 3 NO₂(g) + H₂O(l)
Step 2: Calculate the molar concentration of the species at equilibrium
We will use the following expression.
M = mass of solute / molar mass of solute × liters of solution
[HNO₃] = 15.5g / 63.01 g/mol × 9.5 L = 0.026 M
[NO] = 16.6g / 30.01 g/mol × 9.5 L = 0.058 M
[NO₂] = 22.5g / 46.01 g/mol × 9.5 L = 0.051 M
We do not calculate the molarity of water because it is a pure liquid and will not be included in the equilibrium constant.
Step 3: Calculate the equilibrium constant (Kc)
Kc = [NO₂]³/[HNO₃]²×[NO]
Kc = 0.051³/0.026²×0.058
Kc = 3.4
Pls, Help!!!!
When ionized, which of the following would become isoelectronic with argon?
Answer:
[tex]Cl^-[/tex]
Explanation:
Hello.
In this case, when chlorine gets ionized by gaining one electron it goes:
[tex]Cl^-[/tex]
Whose electron configuration is the same as argon:
[tex]Cl^-=Ar:1s^2,2s^2,2p^2,3s^2,3p^6[/tex]
Since the both of them have 18 electrons, they become isoelectric with the same neutral charge.
Best regards.
When vinegar and baking soda are combined bubbles begin to form. Bubbles are evidence of a chemical reaction because they
Answer:
bubbled
Explanation:
its simple they bubbled
signs of chemical reactions are change of
odor
bubbles
solid turns liquid
liquid turns solid
change of color
Calculate the density of the football. Use the formula D = m/V where D is the density, m is the mass, and V is the volume. Record your calculations in Table B of your Student Guide. What is the density of the football while it is deflated? g/cm3
Answer:
0.84 g/cm3 EDGE 2020
Explanation:
Answer:
What is the density of the football while it is deflated?
⇒ 0.84 g/cm3
what is the ph of blood
Answer:
7.35 to 7.45
Explanation:
According to healthline.com, the average pH of blood is 7.35 to 7.45.
HELP HELP PLEASE ILL GIVE BRAINLEST
compare the circulatory system of a frog and the circulatory system found in humans
Answer:
Frogs have three circuits for their circulation, unlike humans who only have two. Like humans, however, frogs have a systemic circuit, which pumps oxygenated blood throughout the body. The pulmonary circuit moves blood to the lungs to pick up oxygen.
Explanation:
Answer:
A
Explanation:
How might sediment be a good thing?
Answer: Sediment is important because it often enriches the soil with nutrients. Areas rich in sediments are often also rich in biodiversity. Sedimentary soil is usually better for farming. Deltas and river banks, where much sediment is deposited, are often the most fertile agricultural areas in a region.
What is the wavelength of an electromagnetic wave that travels at 3.0 x 10^8m/s and has a frequency of 5.43 x 10^-12Hz?
Answer:
frequency f = velocity of light (c)/wavelength
therefore, wavelength =
velocity of light /frequency
= 3 x 10^8/ 5.43 x 10^-12
= 0.552 x 10^20.
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What is gonna be the density of a block charger that is 22g and 210 cm3
Answer:
Control group
Calculate the nuclear binding energy per nucleon for cobalt-59, the only stable isotope of cobalt. The mass of cobalt-59 is 58.933198 amu. (The mass of 11H is 1.00783 amu, and the mass of a neutron is 1.00866 amu.)
Answer:
8.54 * 10^15 J
Explanation:
For Co-59
Protons- 27
Neutrons- 32
total calculated mass of protons = 27 * 1.00783 amu = 27.211 amu
total calculated mass of neutrons = 32 * 1.00866 amu =37.320 amu
Total calculated mass of nucleons = 27.211 amu + 37.320 amu = 64.531 amu
Mass defect = 64.531 amu - 58.933198 amu = 5.5978 amu
Binding energy = E=(Δm)c^2
Δm= mass defect
c= speed of light
E= 5.5978 amu (3.0 *10^8)^2
E= 5.03 * 10^17 J
Binding energy per nucleon = Binding energy/ total number of nucleons
= 5.03 * 10^17 J/ 59 = 8.54 * 10^15 J
which statement is true about the atomic masses?
A: it is never greater than the atomic number.
B: it can be greater than the atomic number.
C: it always equals the atomic.
D: it is always lower than the atomic number.
it is never greater than the atomic number.
OR,
Atomic mass is greater than Atomic number.. so, Answer is A . If you like this answer then mark this answer as BRAINLIEST answer.Thank you ☺️☺️
Draw the structural formula for CH2CONHCH3 and what its functional group
Answer:
The structural formula of CH2CONHCH3 is attached below -:
and the functional group of CH2CONHCH3 is - Amide
Explanation:
The IUPAC name of CH2CONHCH3 is -: N-methyl ethenamide .
ABOUT AMIDE FUNCTIONAL GROUP -: In organic chemistry, an amide, also known as an organic amide or a carboxamide, is a compound with the general formula RC(= O) NR 'R' where R, R 'and R' represent hydrogen organic groups or atoms. When it is part of the main protein chain, the amide group is referred to as a peptide bond and isopeptide bond when it appears in a side chain, such as asparagine and glutamine in the amino acids.
The structural formula shows the arrangement of atoms and groups in a compound.
A chemical compound is composed of atoms of elements. There are three structures that could be written for a chemical substance. These are;
Empirical formulaMolecular formulaStructural formulaThe structural formula of a compound shows the arrangement of atoms and groups in the compound in space. The structural formula of the compound CH2CONHCH3 has been shown in the image attached. The following functional groups are present in the compound;
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