Answer:
decrease.
Explanation:
WHY? - As you go across a period, electrons are added to the same energy level. ... The concentration of more protons in the nucleus creates a "higher effective nuclear charge." In other words, there is a stronger force of attraction pulling the electrons closer to the nucleus resulting in a smaller atomic radius.
Not sure what to do here. It says to convert the following into formulas and states in an unbalanced equation. Please help!
Answer:
Ca2 solid state
H2O liquid state
Ca(OH)2 I believe this would be in solid state
H2 gas state
Explanation:
Ice melting to become water is an example of a physical change.
True or false
Answer:
true
Explanation:
After ice melts into liquid water, you can refreeze it into solid ice if the temperature drops. Freezing and melting are physical changes. The substances produced during chemical changes however cannot easily change back into the original substances.
What is the name of the 3 lenses that have different powers of magnification 4x, 10x and 40x
Answer:
Scanning Objective Lens (4x)
Low Power Objective (10x)
High Power Objective Lens (40x)
Explanation:
Which statement is true about S-waves?
A They are the slowest selsmic waves.
B They travel only through solids.
They are the first to be detected by
seismometers.
D They can travel through solids and
liquids.
please help
Answer:
B They travel only through solids.
Explanation:
Seismic s-waves are also known as secondary or shear-waves. They are elastic waves that travels within a body.
At a seismic station, they are the second set of waves to arrive after the primary - waves. They can only pass through solid bodies as fluids cannot be sheared. The above mentioned property makes them very useful in determining the interior property of the earth. They are not the slowest seismic waves.A balloon is floating around outside your window. The temperature outside is 39 °C, and the air pressure is 0.800 atm.
Your neighbor, who released the balloon, tells you that he filled it with 4.70 moles of gas. What is the volume of gas inside
this balloon?
Express your answer numerically in liters.
Answer:
V = 150.49 L
Explanation:
Given data:
Pressure = 0.800 atm
Temperature = 39 °C (39+273 = 312 K)
Moles of gas = 4.70 mol
Volume of gas = ?
Solution:
Formula:
PV = nRT
V = nRT/P
V = 4.70 mol × 0.0821 atm.L/mol.K × 312 K / 0.800 atm
V = 120.39 atm.L/ / 0.800 atm
V = 150.49 L
(I AM GIVING BRAINLIEST!!!!)
Before there is a transfer of charges between objects, they are uncharged. What does this mean?
A) There are more positive charges than negative charges.
B) There are more negative charges than positive charges.
C) The positive and negative charges are equal.
D) The positive and negative charges do not exist.
Answer:
C) The positive and negative charges are equal.
Explanation:
Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. The correct option are option C.
What is Ions?Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.
Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.
Before there is a transfer of charges between objects, they are uncharged as the positive and negative charges are equal.
Therefore the correct option are option C.
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How many outer-shell d electrons are there in each of the transition-metal ions?Mn(IV) :Co(III) :Fe(II) :Ni(II) :
Answer:
Mn(IV): 3 outer-shell d electrons
Co(III): 6 outer-shell d electrons
Fe(II): 6 outer-shell d electrons
Ni(II): 8 outer-shell d electrons
Explanation:
Mn(IV):
The ion is Mn⁴⁺, so it has lost 4 valence electrons. The ground state electronic configuration of Mn is [Ar]3d ⁵ 4s ². When the neutral atom loses 4 electrons, the electronic configuration is [Ar]3d ³.
outer-shell d electrons = 3
Co(III):
The ion is Co³⁺, so it has lost 3 valence electrons. The ground state electronic configuration of Co is [Ar]3d ⁷4s ². When the neutral atom loses 3 electrons, the electronic configuration is [Ar]3d ⁶.
outer-shell d electrons = 6
Fe(II):
The ion is Fe²⁺, so it has lost 2 valence electrons. The ground state electronic configuration of Fe is [Ar]3d ⁶4s ². When the neutral atom loses 2 electrons, the electronic configuration is [Ar]3d ⁶.
outer-shell d electrons = 6
Ni(II):
The ion is Ni²⁺, so it has lost 2 valence electrons. The ground state electronic configuration of Ni is [Ar]3d ⁸4s ². When the neutral atom loses 2 electrons, the electronic configuration is [Ar]3d ⁸.
outer-shell d electrons = 8
The d electron in the outer shell of each of the transition metal are:
Mn(IV): 3 d electrons in the outer shell.
Co(III): 6 d electrons.
Fe(II): 6 d electrons.
Ni(II): 8 d electrons.
What is electronic configuration?Electronic configuration is the arrangement of the electrons of an atom.
There are subshell s, p, d, f.
The electrons are arranged in these subshells.
Each element has different arrangement of electrons.
Thus, the number of d electron in each of the element is: Mn(IV) :3, Co(III) :6, Fe(II) :6, Ni(II) :8.
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What is the general rule to name ionic compounds form by a cation and a polyatomic ion, write two examples.
Answer:
Rule 1. The cation is written first in the name; the anion is written second in the name.
Rule 2. When the formula unit contains two or more of the same polyatomic ion, that ion is written in parentheses with the subscript written outside the parentheses.
examples: ammonium ion and hydrogen carbonate
Explanation:
hope this helps
Starch and glycogen
are both polysacharides.
True or false
A solution of potassium sulfide is mixed with a solution of magnesium bromide. Identify the two possible products.
Answer:
Magnesium sulfide and potassium bromide.
Explanation:
Hello!
In this case, for the two mentioned solutions, which are composed by both potassium sulfide (K2S) and magnesium bromide (MgBr2), the following chemical reaction would be carried out:
[tex]K_2S+MgBr_2\rightarrow MgS+KBr[/tex]
However, due to the discrepancy in the atoms of bromine and potassium, the balanced chemical equation should be:
[tex]K_2S+MgBr_2\rightarrow MgS+2KBr[/tex]
Whereas the products are magnesium sulfide and potassium bromide which are both soluble in water.
Best regards!
how to find the number of neutrons
Answer:
For all uncharged atoms, the number of electrons equals the number of protons. The mass number 40 is the sum of protons and neutrons. To find the number of neutrons, subtract the number of protons from the mass number.
Answer:
mass number- protons
Explanation:
why the Modern dry process is preferred to another conventional process?
What state of matter is hydrogen?
Answer:
its a gas
Explanation:
Hydrogen is the chemical element in the periodic table that has the symbol H and atomic number 1. At standard temperature and pressure it is a colorless, odorless, non-metallic, univalent, highly flammable diatomic gas. Hydrogen is the lightest and most abundant element in the universe.
In the given question, the state of matter of Hydrogen is gas in nature.
A state of matter is one of the four distinct forms in which matter can exist as solid, liquid, gas, and plasma.
Hydrogen is a chemical element that occurs naturally as a gas at standard temperature and pressure (STP). It is the lightest and most abundant element in the universe and is found in stars, gas giants, and other celestial bodies.
It is also used in various industrial processes, such as the production of ammonia and methanol, and as a fuel source in fuel cells.
Therefore, hydrogen is in the gaseous state at room temperature and normal atmospheric pressure.
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What formula do you use to calculated density?
O Volume X Mass = Density
O Volume + Mass = Density
O Mass + Volume= Density
Mass - (Volume) x Matter = Density
Cle
Answer:
7 AM was the first to be the best Friend and a friend and I have seen the target market share of a million dollars and Diamond.
Answer:Density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre.
Explanation:
A nitrogen atom in N, should have a
charge of 1-
partial charge 6+.
charge of 0.
partial charge
what characteristics are shared by elements in the same period row?
Answer:
Elements in the same period have the same number of electron shells.
Explanation:
elements gain electrons and protons and become less metallic
12. Calculate the no of molecules in:
34g of ammonia molecules, NH3
Answer:
1.2 × 10²⁴ molecules NH₃
General Formulas and Concepts:
Chemistry
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Dimensional AnalysisExplanation:
Step 1: Define
34 grams NH₃
Step 2: Define conversions
Avogadro's Number
Molar Mass of N - 14.01 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of NH₃ - 14.01 + 3(1.01) = 17.04 g/mol
Step 3: Convert
[tex]34 \ g \ NH_3(\frac{1 \ mol \ NH_3}{17.04 \ g \ NH_3} )(\frac{6.022 \cdot 10^{23} \ molecules \ NH_3}{1 \ mol \ NH_3} )[/tex] = 1.20157 × 10²⁴ molecules NH₃
Step 4: Check
We are given 2 sig figs. Follow sig fig rules.
1.20157 × 10²⁴ molecules NH₃ ≈ 1.2 × 10²⁴ molecules NH₃
A blank solution containing only solvent had an absorbance of 0.029 at the same wavelength. Find the molar absorptivity of compound A.
Answer:
The question is incomplete. Searching in google I found: A 3.96x10⁻⁴ M solution of compound A exhibited an absorbance of 0.624 at 238 nm in a 1.000-cm cuvette. A blank solution containing only solvent had an absorbance of 0.029 at the same wavelength. Find the molar absorptivity of compound A.
The molar absorptivity of compound A is 1502.5 M⁻¹cm⁻¹.
Explanation:
The question is incomplete. Searching in google I found: A 3.96x10⁻⁴ M solution of compound A exhibited an absorbance of 0.624 at 238 nm in a 1.000-cm cuvette. A blank solution containing only solvent had an absorbance of 0.029 at the same wavelength. Find the molar absorptivity of compound A.
The absorbance (A) is given by:
[tex] A = \epsilon cl [/tex]
Where:
c: is the concentration of compound A = 3.96x10⁻⁴ M
ε: is the molar absorptivity of compound A =?
l: is the pathlength = 1 cm
[tex]A_{s}[/tex]: is the absorbance of the solution= 0.624
[tex]A_{b}[/tex]: is the absorbance of the blank solution= 0.029
First, we need to find the absorbance of compound A:
[tex] A = A_{s} - A_{b} = 0.624 - 0.029 = 0.595 [/tex]
Now, we can calculate the molar absorptivity of compound A:
[tex] \epsilon = \frac{A}{cl} = \frac{0.595}{3.96 \cdot 10^{-4} M*1 cm} = 1502.5 M^{-1}cm^{-1} [/tex]
Therefore, the molar absorptivity of compound A is 1502.5 M⁻¹cm⁻¹.
I hope it helps you!
The distance from San Francisco to Los Angeles is approximately 385 miles. 1609 m = 1 mile. How many kilometers is this? Do not enter “kilometers” as part of your answer.
Answer:
619.465 kilometers
Explanation:
1609 m = 1 mile
so 385 miles is equal to 619465 meters (385 x 1609= 619465)
1000 meters = 1 km
so 619465 meters is 619.465 kilometers
A image of a drag race car has long arrow A pointing up, medium length arrow B pointing down, medium length arrow C pointing forward and left, and short arrow D pointing backward and right. Which arrow represents the force of gravity acting upon the car? Which arrow represents the normal force on the car? Which arrow represents the applied force on the car when the driver steps on the gas pedal?
Which arrow represents the force of gravity acting upon the car?
✔ B
Which arrow represents the normal force on the car?
✔ A
Which arrow represents the applied force on the car when the driver steps on the gas pedal?
✔ C
Calculate the number of moles of Cl atoms in 1.81×1024 formula units of magnesium chloride, MgCl2.
10 m/s to 80 m/s in 5 seconds
900 mph................
Answer:
a = 0.8 m/s/s
Vav = 45m/s
Explanation:
Vav = [tex]\frac{Vi + Vf}{2\\}[/tex]
Vav = [tex]\frac{10 +80}{2}[/tex]
Vav = 45m/s
a = [tex]\frac{v}{t}[/tex]
a = [tex]\frac{4m/s}{5s}[/tex]
a= 0.8m/s/s
1s22s22p63823p64523d104p5s24d105p5
What is the name of the element?
Answer:
IODINE
Explanation:
The sublevel notation of the element:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵
To find this element, we must add the powers of the each of the sublevels. This is the number of electrons in the orbital of the atom.
2 + 2 + 6 + 2 + 6 + 2 + 10 + 6 + 2 + 10 + 5 = 53
This give atom has 53 electrons and we can assume it to have an atomic number of 53.
The element is IODINE
Sodium, potassium, and cesium belong to which group?
inner transition metals
halogens
alkali metals
Answer:
Alkali Metals
Explanation:
#45 State whether the following sets of quantum numbers are valid. If the set of quantum numbers aren’t valid, indicate why.Indicate what orbital the electron is in regardless of whether the numbers are valid or not.
n = 3 l = 3 ml= 0 ms= +1/2
n = 2 l = 1 ml= -1 ms= -1/2
n = 3l = 0 ml= 1 ms= +1/2
#46 Give the “COMPLETE” electron configuration for antimony. Is it paramagnetic or diamagnetic? If there are unpaired electrons, indicate how many.
Answer:
(a) "l" cant be more than n-1. n= 3 so l cant be more than 2.
(b) Valid
(c) If l=0, ml can only be 0.
Sb, Antimony, 51 electrons
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p3
paramagnetic 3 unpaired electrons
Explanation:
(a) "l" (lower case L) can be 0, 1, 2 up to n-1. If n=3, l can be 0, 1, or 2.
(b) This set of quantum numbers is valid. n can be 1, 2, 3, ...
since n= 2, l can be any number from 0 to n-1 or 0,1
Since l=1, ml can be -1, 0, 1
ms can always be +1/2 or -1/2
(c) ml can only be from -l to +l. If l=0, ml=0.
If l was 2, ml could be -2, -1, 0, 1, 2
how many moles of hydrogen are needed to produce 8 moles of methane CH4? C + H2-> CH4
Answer:
20 mol H₂
General Formulas and Concepts:
Chem
StoichiometryExplanation:
Step 1: Define
RxN: C + H₂ → CH₄
8 moles CH₄
Step 2: Balance RxN
C + 2H₂ → CH₄
Step 3: Stoichiometry
[tex]8 \ mol \ CH_4(\frac{2 \ mol \ H_2}{1 \ mol \ CH_4} )[/tex] = 16 mol H₂
Step 4: Check
We are given 1 sig fig. Follow sig fig rules.
16 mol H₂ ≈ 20 mol H₂
Which part of an atom is gained, lost, or shared during a chemical reaction? (2 points)
оа
Electron
Oь
Proton
ос
Neutron
Od
Nucleus
Answer:
a) electron
Explanation:
Answer:
a
Explanation:
i took the test
Dan bikes 10 km west and then bikes another 5 km west. What is Dan's
velocity if it takes him 45 minutes?
A. 0.1 km/min west
B. 3 km/min west
C. 0.3 km/min west
D. 9 km/min west
What is the total number of electrons in a S2- jon?
1.
10
2.
14
16
4.
18
the answer is D) 18 electrons
Which of the following can be predicted using the activity series?
Speed of an acid-base reaction
Speed of a double replacement reaction
Possibility of a double replacement reaction
Possibility of a single replacement reaction
Answer:
Possibility of a single replacement reaction
Explanation:
The activity series of element can be used to predict the possibility of a single replacement reaction.
A single replacement reaction is one in which one substance is replacing the other. The replacement of a metallic ion in solution by a metal atom higher in the activity series than the metal in solution falls into this category of reactions. The relative position of the two elements in the activity series provides the driving force for this kind of reaction. If the element to replace the other is more reactive, the reaction will occur. If it is less reactive, the reaction will not occur.Answer:
Possibility of a single replacement reaction
Explanation: