Answer:
B
Explanation:
Meiosis ensures that the sperm and egg contain only 50-50.10% of the chromosomes of an organism.
How many electrons can the n = 4 shell hold?
Answer: I think its 32 I'm not sure
Explanation:
yall ever just wanna then ?
Answer:
ummmmm huh?
Explanation:
.......im confused on the question
How much force does a 35 kg child have that is running through the house at an acceleration of 20 m/s2?
Answer:
700N
Explanation:
F=ma
mass=35
acceleration =20
4. What is the specific heat of copper if it took
57.8 J of heat energy added to 10 grams to
produce a 15°C temperature change?
Answer:
Specific heat capacity of copper is 0.385 J/g.°C
Explanation:
Given data:
Specific heat capacity of copper = ?
Heat absorbed by copper = 57.8 J
Mass of copper = 10 g
Temperature changes = 15°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
by putting values
57.8 J = 10 g × c × 15°C
57.8 J = 150 g.°C × c
c = 57.8 J / 150 g.°C
c = 0.385 J/g.°C
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Specific heat capacity of copper is 0.385 J/g.°C.
Which group of elements satisfies the octet rule?
Alkali metals
Alkaline earth metals
halogens
Noble gases
Answer:
the anser is c
Explanation:
Does anyone know the answer please?
Answer:Cs2O + H2O —> 2CsOH [2Cs+ + 2OH-]
Explanation: Cs is the most electropositive element, with electron structure [Xe] 6s1.
What is the mass of 9 atom(s) of Oxygen in grams?
Answer:
2 × 10⁻²² g
Explanation:
Step 1: Given data
Atoms of oxygen: 9 atoms
Step 2: Calculate the moles corresponding to 9 atoms of O
We will use Avogadro's number: there are 6.02 × 10²³ atoms of O in 1 mole of atoms of O.
9 atom × 1 mol/6.02 × 10²³ atom = 1 × 10⁻²³ mol
Step 3: Calculate the mass corresponding to 1 × 10⁻²³ moles of O
The molar mass of O is 16.00 g/mol.
1 × 10⁻²³ mol × 16.00 g/mol = 2 × 10⁻²² g
is anyone blonde hair?????
no why
anser;
explinaton;
When NH3(aq) is added to Cu2 (aq), a precipitate initially forms. Its formula is:
a. Cu(NH)3
b. Cu(NO3)2
c. Cu(OH)2
d. Cu(NH3)22
e. CuO
When NH₃(aq) is added to Cu₂(aq), a precipitate initially forms. Its formula is Cu(NH₃)². The correct option is d.
What is a chemical formula?A chemical formula is a representation of chemical elements and chemical compounds. The chemical letters are used to write the chemical formula. The charges if present is written by charges symbols like plus, minus.
The chemical reaction is
NH₃(aq) + Cu₂(aq) = Cu(NH₃)²
This is called a chemical reaction, which contains reactant on the left side and products on the right side. The precipitate that is formed is copper ammonia whole twice.
Precipitation is the solid crystals' substance that is come out at the surface of the liquid. It is collected in solid form, and it is called a precipitate.
Thus, the correct option is d. Cu(NH₃)².
To learn more about chemical formulas, refer to the link:
https://brainly.com/question/15138610
#SPJ2
Explain why the quantitative value for the lattice enthalpy of calcium bromide is larger than the value for the lattice enthalpy of potassium bromide.
Answer:
Explanation:
We define lattice energy as "the change in internal energy that accompanies the formation of one mole of the solid from its constituent gas phase ions." (Housecroeft and Sharpe, 2012).
Also, lattice energy depends on the size of the ions. In this case, the anion is the same so we consider the relative sizes of the cations. The smaller the size of the cation, the greater the quantitative value of the lattice energy.
Since Ca^2+ is smaller than K^+, the quantitative value for the lattice enthalpy of calcium bromide is larger than the value for the lattice enthalpy of potassium bromide.
A single gold atom has a mass of 197.0 amu. How many gold atoms are in a cube of gold that is 10.0 mm on each side (about the size of a sugar cube) if the density of gold is 19.3 g/cm3
Answer:
5.90x10²² atoms of gold are present in the cube
Explanation:
First, we must find the volume of the cube in cm³. With density we can find the mass of the gold and the moles using its molar mass. As 1 mol = 6.022x10²³ atoms we can find the number of atoms:
Volume in cm³:
(10.0mm)³ = 1000mm³
1mm³ = 0.001cm³
1000mm³ * (0.001cm³ / 1mm³) = 1cm³
Mass gold:
1cm³ * (19.3g/cm³) = 19.3g Gold
Moles Gold:
19.3g * (1mol / 197.0g) = 0.0980 moles Gold
Atoms gold:
0.0980 moles Gold * (6.022x10²³ atoms / mol) =
5.90x10²² atoms of gold are present in the cubeIn the bloodstream, the effective pKa for carbonic acid is 6.35. If the pH of the blood is 7.40, what percentage of the blood buffer is present as bicarbonate
Answer:
The 91.8% is present as bicarbonate ion
Explanation:
It is possible to find pH of a buffer using H-H equation:
pH = pKa + log [A⁻] / [HA]
Where pH is 7.40; pKa is 6.36, [A⁻] is concentration of bicarbonate ion and [HA] concentration of carbonic acid
7.40 = 6.35 + log [A⁻] / [HA]
1.05 = log [A⁻] / [HA]
11.22 = [A⁻] / [HA] (1)
As the question is in therms of percentage:
[A⁻] + [HA] = 100 (2)
Replacing (2) in (1):
11.22 = [A⁻] / 100 - [A⁻]
1122 - 11.22[A⁻] = [A⁻]
1122 = 12.22[A⁻]
91,8% = [A⁻]
The 91.8% is present as bicarbonate ion
Why do the balls of the Newton’s cradle eventually stop?
The balls of the Newton’s cradle eventually stop because they loose energy as they collide.
The balls of the Newton’s cradle lose energy to the air as they move through it due to friction.
These balls make sound when they collide, and consequently the balls loose energy to heat upon collision.
The balls loose energy as they collide with each other and eventually stop.
Thus, we can conclude that the balls of the Newton’s cradle eventually stop because they loose energy as they collide.
Learn more about Newton’s cradle here: https://brainly.com/question/14063949
Draw a Lewis structure for H3O+ . Include all hydrogen atoms and show all unshared electrons and the formal charges, if any. Assume that bonding follows the octet rule.
Answer:
In this Lewis equation it can be seen how oxygen and hydrogen have a dative union, that is, there is a proton that is temporarily "borrowed"
Explanation:
This molecule is the same as water but with one more hydrogen, that is why the general charge of the molecule is positive
A chemist determines by measurements that moles of nitrogen gas participate in a chemical reaction. Calculate the mass of nitrogen gas that participates.
Answer:
0.56 g
Explanation:
A chemist determines by measurements that 0.020 moles of nitrogen gas participate in a chemical reaction. Calculate the mass of nitrogen gas that participates.
Step 1: Given data
Moles of nitrogen gas (n): 0.020 mol
Step 2: Calculate the molar mass (M) of nitrogen gas
Molecular nitrogen is a gas formed by diatomic molecules, whose chemical formula is N₂. Its molar mass is:
M(N₂) = 2 × M(N) = 2 × 14.01 g/mol = 28.02 g/mol
Step 3: Calculate the mass (m) corresponding to 0 0.020 moles of nitrogen gas
We will use the following expression.
m = n × M
m = 0.020 mol × 28.02 g/mol
m = 0.56 g
Explain the differences among "s," "p," "d", and "f," electron orbitals
Answer:
Explanation:
The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).
There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level. Electrons with less energy will be spinning at level 1. Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f. In the sub-level s there can only be a maximum of 2 electrons, in p there can be a maximum of 6 electrons, in the sub-level d 10 electrons and finally in the sub-level f there can be a maximum of 14 electrons.
In other words, the difference between the sub-levels consists of the number of electrons that it can hold at each level. In each sublevel there are a certain number of orbitals [1 orbital describes the rotation of a maximum of two electrons around the nucleus] that can contain a maximum of 2 electrons each. In this way, the maximum number of electrons that each sublevel admits is: 2 in the s; 6 in the p (2 electrons x 3 orbitals); 10 in the d (2 electrons x 5 orbitals); 14 in the f (2 electrons x 7 orbitals).
A typical person has an average heart rate of 69.0 beats/min. Calculate the given questions. How many beats does she have in 7.0 years? How many beats in 7.00 years? And finally, how many beats in 7.000 years? Pay close attention to significant figures in this question.
Answer:
See explanation
Explanation:
Average heart beat = Number of heart beats/ time
7.0 years = 7.0 * 365 * 24 * 60 = 3679200 minutes
If there are 69 beats in 1 minutes
There are x beats in 3679200 minutes
x = 253865 beats
x = 254000.00 beats ( to 3 sf)
beats in 7.00 years = 254000.000 beats
beats in 7.000 years = 254000.0000 beats
a glass of organge juice contains .85dl of juice. how many millimeters of orange juice is that
Answer:
85 ml
Explanation:
move the decimal place over two times
3) 46.7 L of a gas is initially at a pressure of 662 torr and a temperature of 266 K. If the volume decreases to 35.0 L and the temperature increases to 342 K, what is the new pressure?
Answer:
The new pressure is 1,135.67 torr
Explanation:
Boyle's law establishes the relationship between pressure and volume of a gas when the temperature is constant, establishing that the pressure of a gas in a closed container is inversely proportional to the volume of the container. Mathematically, this law says that the product of pressure and volume is constant:
P*V=k
Charles's law establishes the relationship between the temperature and the volume of a gas when the pressure is constant. This law states that the volume is directly proportional to the temperature of the gas. So, Charles's law says that the quotient that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Finally, Gay-Lussac's Law is a gas law that relates pressure and temperature at constant volume. This law says that the pressure of the gas is directly proportional to its temperature:
[tex]\frac{P}{T} =k[/tex]
Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:
[tex]\frac{P*V}{T} =k[/tex]
Analyzing an initial state 1 and a final state 2, it is satisfied:
[tex]\frac{P1*V1}{T1} =\frac{P2*V2}{T2}[/tex]
In this case:
P1= 662 torrV1= 46.7 LT1= 266 KP2= ?V2= 35 LT2= 342 KReplacing:
[tex]\frac{662 torr*46.7 L}{266 K} =\frac{P2*35 L}{342 K}[/tex]
Solving:
[tex]P2=\frac{342 K}{35 L} *\frac{662 torr*46.7 L}{266 K}[/tex]
P2= 1,135.67 torr
The new pressure is 1,135.67 torr
How many chloride ions are needed to create a neutral compound with a barium ion? A. 2
B. 3
C. 4
D. 1
Answer:
Barium chloride is represented as BaCl2.
Explanation:
so answer is a.)2
I hope it's helpful!
The number of atoms or molecules in a mole is known as the __________ constant.
Answer: Avogrado's Constant
Explanation:
One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant. The concept of the mole can be used to convert between mass and number of particles.
Calculate the molar mass of each salt.
Element Molar mass (g/mol)
Beryllium (Be) 9.012
Magnesium (Mg) 24.31
Cobalt (Co) 58.93
Cadmium (Cd) 112.41
Iodine (II) 126.90
a. The Molar mass of CaBr2 is:_______
b. The Molar mass of BeBr2 is:_______
c. The Molar mass of CdBr2 is:_______
d. The Molar mass of CuBr2 is:_______
Answer:
a.
[tex]M_{CaBr_2}=40.08+79.9*2=199.88 g/mol[/tex]
b.
[tex]M_{BeBr_2}=9.012+79.9*2=168.81g/mol[/tex]
c.
[tex]M_{CdBr_2}=112.41+79.9*2=272.21g/mol[/tex]
d.
[tex]M_{CuBr_2}=63.55+79.9*2=223.35g/mol[/tex]
Explanation:
Hello!
In this case, since the molar mass of a compound is computed by adding the molar mass of each element composing it and multiplying it by the number of atoms in the molecule, we have:
a.
[tex]M_{CaBr_2}=40.08+79.9*2=199.88 g/mol[/tex]
b.
[tex]M_{BeBr_2}=9.012+79.9*2=168.81g/mol[/tex]
c.
[tex]M_{CdBr_2}=112.41+79.9*2=272.21g/mol[/tex]
d.
[tex]M_{CuBr_2}=63.55+79.9*2=223.35g/mol[/tex]
Best regards!
importance of solution in industry?
Answer:The majority of chemical processes are reactions that occur in solution. Important industrial processes often utilize solution chemistry. "Life" is the sum of a series of complex processes occurring in solution. Air, tap water, tincture of iodine, beverages, and household ammonia are common examples of solutions.
A solution is a homogenous mixture of substances with variable composition. The substance present in the major proportion is called the solvent, whereas the substance present in the minor proportion is called the solute. It is possible to have solutions composed of several solutes. The process of a solute dissolving in a solute is called dissolution.
Explanation:
what is the mass of 1 mole of NaCl and 1 mole of Nitrogen
Answer:
1 mole of sodium chloride( NaCl)
=58.4g/mol
1 mole of nitrogen
=14.0g/mol
The ideal bond angles marked 1, 2, and 3 in the molecule below are about _______, ______, and ______.
Answer:
D= 109.5 degrees, 109.5 degrees, 120 degrees
Explanation:
The bond angle observed for any bond between two chemical species depends on the hybridization of the atoms.
However, for organic compounds, single bonds normally involve sp3 hybridized atoms with a bond angle of 109.5 degrees such as in the positions marked a and b.
However, a double bond is made of atoms in sp2 hybridized state with a bond angle of 120 degrees such as in c.
Which of these elements has physical and chemical properties most similar to Sulfur (S)?
A)Selenium (Se)
B) Phosphorus (P)
C) Argon (Ar)
D) Chlorine (Cl)
Terri wants to learn about areas that could be volcanically active. Ernesto wants to learn about the history of rocks in
an area. Which statement is true?
O Terri should use a topographic map and Ernesto should use a geographic map.
O Terri should use a geographic map and Ernesto should use a topographic map.
Terri and Ernesto should both use geographic maps.
Terri and Ernesto should both use topographic maps.
Terri and Ernesto should both use geographic maps.
may i have brainliest? :D
Answer:
C.
Explanation:
I dunno. took the test and got it right.
An ________ molecular ion peak usually indicates the presence of an odd number of nitrogen atoms in the molecule.
Answer:
odd
Explanation:
By applying the Nitrogen rule; A molecular ion with odd mass numbers will contain an odd number of a nitrogen atom, however, a molecular ion with an even mass number will contain either an even number of a nitrogen atom or no nitrogen.
So from the given information, the missing word is odd .
Which element easily gains one electron to form a negative ion?
Flourine
Magnesium
Nitrogen
Lithium
Answer: Fluorine
Explanation: Fluorine has an oxidation state of -1, meaning it gains 1 electron in chemical bonds, forming a negative ion. Magnesium has an oxidation state of +2, nitrogen has -3, and lithium has an oxidation state of +1.
Answer:
Fluorine.
Explanation:
I took this test not to long ago. I got this question correct. Also, the reason is because every other element is balanced.
What is the solid product formed from the reaction between aqueous potassium hydroxide and aqueous iron
(III) chloride?
Answer:
potassium chloride (KCl)
Explanation:
The reaction between aqueous potassium hydroxide and aqueous iron (III) hydroxide is a double replacement reaction.
3 KOH + FeCl₃ → 3 KCl + Fe(OH)₃
Hope that helps.
Answer:
The correct answer is
[tex]Fe(OH)_{3}[/tex]
Explanation: I tried the KCI and it was incorrect but it showed the answer so here you go!
