Answer: Lava lamps, Earth's mantle, and the Earth's atmosphere.
Explanation: Convection occurs when denser elements sink while less dense elements rise due to difference in density caused by heat.
The wax in lava lamps rises when heated up since their density decreases. The same is for the Earth's mantle, where hotter materials rise, while the cooler ones sink.
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 cubeimportance 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:
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).
Part of the electromagnetic spectrum is visible light. Which color is at the opposite end from red on the visible spectrum?
green
infrared
violet
yellow
Pretty sure it’s violet
Answer:
c voilet
Explanation:
The following data were collected for the reaction between hydrogen and nitric oxide at 700°C: 2H2(g) + 2NO(g) -+ 2H20(g) + N2(g) Experiment [H2]/M [NO]/M Initial rate/M. s-1 1 0.010 0.025 2.4 X 10-6 2 0.0050 0.025 1.2 X 10-6 3 0.010 0.0125 0.60 X 10-6 (a) What is the rate law for the reaction? (b) Calculate the rate constant for the reaction. (c) Suggest a plausible reaction mechanism that is consistent with the rate
Answer:
Explanation:
Given that:
2H₂(g) + 2NO(g) → 2H₂O(g) + N₂(g)
Experiment [H₂] (M) [NO] (M) Initial Rate (M/s)
1 0.010 0.025 2.4 × 10⁻⁶
2 0.0050 0.025 1.2 × 10⁻⁶
3 0.010 0.0125 0.60 × 10⁻⁶
The general formula for rate law is:
[tex]rate = k[H_2]_x [NO]_y[/tex]
From (1) and (2), it is obvious that the concentration of NO looks constant unlike that of H₂ which has decreased by 1/2. Similarly, the initial rate also reduced by 1/2. Hence, the initial rate is proportional to the concentration of H₂. So, x = 1
Also;
From (1) and (3), it is obvious that the concentration of H₂ looks constant unlike that of NO which has decreased by 1/2. Similarly, the initial rate also reduced by 1/4. Hence, the initial rate is proportional to the concentration of NO. So, y = 2
∴
The overall rate law is: [tex]rate = k[H_2][NO]_2[/tex]
[tex]Order \ of \ reaction = 1 + 2 = 3[/tex]
(b)
From (1)
The rate constant is:
[tex]rate = k[H_2][NO]_2[/tex]
∴
[tex]k = \dfrac{rate}{ [H_2] [NO]^2}[/tex]
[tex]k = \dfrac{2.4 \times 10^{-6} \ M/s}{(0.010 \ M)(0.025 \ M)^2 }[/tex]
k = 0.38 / M².s
(c)
From the rate law, it is pertinent to understand that the slow step in the reaction includes one molecule of H₂ and two molecules of NO, where O atoms serve as an intermediary.
SO;
H₂ + 2NO → N₂ + H₂O + O slow step
O + H₂ → H₂O fast step
2H₂ + 2NO → 2H₂O + N₂
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.
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
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.
is anyone blonde hair?????
no why
anser;
explinaton;
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)
How many electrons can the n = 4 shell hold?
Answer: I think its 32 I'm not sure
Explanation:
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 .
how does the percentage by mass of the solute describe the concentration of an aqueous solution os potassium sulfate
Answer:
Explanation:
In an aqueous solution of potassium sulfate (K₂SO₄), the solute is K₂SO₄ and the solvent is water. The percentage by mass describes the grams of solute there are dissolved per 100 grams of solution. It can be calculated as:
mass percentage = (mass of solute/total mass of solution) x 100%
For example, in an aqueous solution which is 2% by mass of K₂SO₄, there are 2 grams of K₂SO₄ per 100 g of solution.
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
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!
Which part of the body is least involved in striking a volleyball?
back
hand
core
legs
The only part used in hitting a volleyball is your hand. T/F?
True
False
.
______ is important in volleyball because it is important that you are able to change direction.
speed
strength
coordination
agility
________ is important in volleyball because in order to strike the ball, you must first see the ball
body coordination
clothing coordination
hand eye coordination
Answer:
1. your back
2. false
3. agility
4. hand eye coordination
Explanation:
hope this helps <3
yall ever just wanna then ?
Answer:
ummmmm huh?
Explanation:
.......im confused on the question
Which group of elements satisfies the octet rule?
Alkali metals
Alkaline earth metals
halogens
Noble gases
Answer:
the anser is c
Explanation:
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
In 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
Does anyone know the answer please?
Answer:Cs2O + H2O —> 2CsOH [2Cs+ + 2OH-]
Explanation: Cs is the most electropositive element, with electron structure [Xe] 6s1.
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
Mercury, also known as quicksilver, is a metallic element and a liquid at room temperature. Calculate mercury's density if a sample of mercury is found to have a mass of 685.0685.0 g and a volume of 51.3951.39 mL. density: g/mL
Answer:
13.33g/mL is mercury's density
Explanation:
The density of a substance is defined as the ratio between the mass of the substance and the space that occupy. We can express the density of mercury in g/mL:
Grams mercury: 685.0g
Volume = 51.39mL
That means the density of the mercury is:
685.0g / 51.39mL
13.33g/mL is mercury's densityhow do you find the guide statements are they easy or difficult to complete?
Answer:
difficult
Explanation:
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!
A triangle has vertices with coordinates (2,0), (3, -1) and (-2,-5). If the triangle is dilated by a scale factor of 3 with the origin as the center of dilation, what are the coordinates of the vertices of the image?
a
(5,3), (6,2), (1,-2)
b
(6,0), (9,-3), (-6,-15)
c
(2/3,0), (1,-1/3), (-2/3,-5/3)
d
(-1,-3), (0,-4), (-5,-8)
A chemist has 2.0 mol of methanol (CH3OH). The molar mass of methanol is 32.0 g/mol. What is the mass, in grams, of the sample? 16 30 32 64
Answer:
[tex]\boxed {\boxed {\sf D. \ 64 \ grams }}[/tex]
Explanation:
Given the moles, we are asked to find the mass of a sample.
We know that the molar mass of methanol is 32.0 grams per mole. We can use this number as a fraction or ratio.
[tex]\frac{32 \ g \ CH_3OH}{1 \ mol \ CH_3OH}[/tex]
Multiply by the given number of moles, which is 2.0
[tex]2.0 \ mol \ CH_3OH *\frac{32 \ g \ CH_3OH}{1 \ mol \ CH_3OH}[/tex]
The moles of methanol will cancel each other out.
[tex]2.0 \ *\frac{32 \ g \ CH_3OH}{1 }[/tex]
The denominator of 1 can be ignored.
[tex]2.0 * 32 \ g\ CH_3OH[/tex]
Multiply.
[tex]64 \ g \ CH_3OH[/tex]
There are 64 grams of methanol in the sample.
The answer is 64 grams, or:
D. 64What 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
During a flood, a mountain stream is carrying clay, silt, sand, and pebbles. The streambed and particle sizes are shown below. Which sediments will most likely be deposited first when the stream slows down?
A. Pebbles
B. Sand
C. Silt
D. Clay
The clay because it has the smallest particles size.
Answer:
Pebbles
Explanation:
The faster a stream flows, the larger the particles it can carry. When the current slows down the largest particles will be deposited first, which in this case are the pebbles. If the stream continues to slow down the sand will be deposited next, followed by the silt and clay. (Clay is only deposited when the water is nearly still.)
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:
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