Answer:
Ores mined from shields.
Explanation:
Ores mined from shields are the source from which we get the history of Precambrian rocks. The Ores from shield experience the Precambrian era so that's why its rocks provides information about that era. The Precambrian supereon is the division of the geological time scale which is the first and longest stage in the history of the Earth which also includes the Hádic, Archaic and Proterozoic eons.
If a sample of a gas occupies 5.22 L at 235 oC, what will its volume be at 75 oC if the pressure remains the same?
Answer:
1618.2
Explanation:
235+75=310×75=1618.2
N2 + 3H2 → 2NH3 How many moles of hydrogen are needed to react with 5 moles of nitrogen?
Answer: 15 mol
Explanation:
From the equation, we know that for every mole of nitrogen consumed, 3 moles of hydrogen are consumed.
So, the answer is 5(3) = 15 mol
Can someone please help me on this
Answer:
it's none because the graph is decreasing like a milf so that why
One of the reasons that solid CuSO4 dissolves in water is: a instantaneous dipole-induced dipole forces (dispersion or London forces) between the Cu2 and the SO42- ions b the ion-dipole forces between the ions and the water molecules c the electrostatic force of attraction between the Cu2 and the SO42- ions d the hydrogen bonding between the water molecules e instantaneous dipole-induced dipole forces (dispersion or London forces) between the water molecules
Answer:
the ion-dipole forces between the ions and the water molecules
Explanation:
Water is a polar molecule having a high dipole moment. This high polarity makes it a popular choice of polar solvent.
CuSO4 is an ionic compound composed of Cu^2+ and SO4^2-. When dissolved in water, the positive dipole in water interacts with the negative ion while the negative dipole in water interacts with the positive ion thereby causing the compound(CuSO4 ) to dissolve in water due to the ion-dipole forces between the ions and the water molecules.
a gas with a volume of 20.0l at a pressure of 275 kpa is allowed to expand to a volume of 35.0l. what is the pressure in the container if the temperature remains constant?
1. 2.54 kPa
2. 157 kPa
3. 481 kPa
pls help ;(
Answer:
[tex]\boxed {\boxed {\sf 2. \ 157 \ kPa}}[/tex]
Explanation:
Since temperature remains constant, the only variables that change are volume and pressure. Therefore, we are using Boyle's Law. This states that the pressure is inversely proportional to the volume. The formula is:
[tex]P_1V_1=P_2V_2[/tex]
We know the gas starts with a volume of 20.0 liters at a pressure of 275 kPa. We can substitute these values into the left side of the formula.
[tex]275 \ kPa *20.0 \ L=P_2V_2[/tex]
We know the gas expands to a volume of 35.0 Liters, but we do not know the pressure.
[tex]275 \ kPa *20.0 \ L=P_2* 35.0 \ L[/tex]
Since we are solving for the new pressure, we must isolate the variable P₂. It is being multiplied by 35.0 Liters and the inverse of multiplication is division. Divide both sides by 35.0 L.
[tex]\frac {275 \ kPa * 20.0 \ L}{ 35.0 \ L}= \frac{P_2*35.0 \ L}{35.0 \ L}[/tex]
[tex]\frac {275 \ kPa * 20.0 \ L}{ 35.0 \ L}=P_2[/tex]
The units of liters cancel.
[tex]\frac {275 \ kPa * 20.0 }{ 35.0 }=P_2[/tex]
[tex]\frac {5500}{35.0} \ kPa= P_2[/tex]
[tex]157.142857 \ kPa=P_2[/tex]
The original measurements of pressure and volume have 3 significant figures, so our answer must have the same. For the number we calculated, that is the ones place.
The 1 in the tenths place (157.142857) tells us to leave the 7 in the ones place.
[tex]157 \ kPa= P_2[/tex]
If the gas expanded to a volume of 35.0 liters while the temperature remained constant, the pressure in container was approximately 157 kilopascals.
8.
(a) Tick (™) the box next to the correct statement about the mixture.
mixture of four elements
mixture of four compounds
mixture of two elements and two compounds
mixture of one element and three compounds
Answer:
mixture of four compounds
mixture of two elements and two compounds
Explanation:
it can be one of thosecan u tell me if its correct pls I'm studying this tooHow do the products of a nuclear fusion reaction differ from reactants?
Answer:The products of nuclear fusion are by far heavier than the reactants. Nuclear fusion is the combination of small atomic nuclei into larger ones.This reaction is accompanied with the release of a large amount of energy:
²₁H + ²₁H → ⁴₂He + energy
In the above reaction,
two hydrogen atoms fuse and produce a heavier helium atom which differs from the combining atoms.
Explanation:
Why does the rate of the forward reaction increase when the surface area of a reactant is increased
?
When the surface area increases, the concentration of the substance increases, which reduces
the number of effective collisions.
When the surface area increases, the temperature of the system increases, which in turn
increases the number of effective collisions.
When the surface area increases, the density of the substance increases, which increases the
number of collisions.
When the surface area increases, the number of particle collisions increases, which in turn
increases the number of effective collisions.
What is the iupac name of CH3-O-CH2-CH2-CH3?
Answer:
The iupac name of CH3-O-CH2-CH2-CH3 is Methoxybutane.
A sample of gas has a pressure of 600 volume of 2.5 L, and a temperature of 22°C . If the pressure is changed to 760 mmHg and the volumes changed to 1.8L what will the new temperature be in K?
A) -4K
B)269K
C)-8K
D)435K
it is A it got to be A)-4k
Explanation:
Which of the following pH numbers are acidic? (Choose 2)
9
11
7
5
3
the pH numbers that are acidic above is 3 and 5
Which layer of the earth is the thinnest and thickest?
Answer:
crust
Discuss with the whole class what the relative thicknesses of the layers are — that the inner core and outer core together form the thickest layer of the Earth and that the crust is by far the thinnest layer.
Explanation:
Discuss with the whole class what the relative thicknesses of the layers are — that the inner core and outer core together form the thickest layer of the Earth and that the crust is by far the thinnest layer.
6NaBr+1AlO3=3Na2O+2AlBr3 How many grams of NaBr would be needed in order to make 23.5 grams of AlBr3
Answer:
23.5 grams of AlBr3 will be produced by 27.20 grams of NaBr
Explanation:
The balanced equation here is
6NaBr + 1AlO3 = 3Na2O + 2AlBr3
6 moles of NaBr are required to produce 2 moles of AlBr3
Mass of one mole of NaBr = 102.894 g/mol
Mass of one mole of AlBr3 = 266.69 g/mol
Mass of 6 moles of NaBr = 6*102.894 g/mol
Mass of two moles of AlBr3 = 2*266.69 g/mol
6*102.894 g NaBr produces 2*266.69 g of AlBr3
23.5 grams of AlBr3 will be produced by (6*102.894)/(2*266.69 )*23.5 = 27.20 grams of NaBr
HELP PLEASE!!!!!
What is the molarity of a solution prepared by dissolving 30.0 grams of NaOH in enough water to make a solution with a total volume of 2.40 liters? (5 points)
0.150 M NaOH
0.218 M NaOH
0.313 M NaOH
0.462 M NaOH
Answer:
0.313 M NaOH
Explanation:
Got it right on the test.
Taking into account the definition of molarity, the molarity of the solution is 0.313 M.
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
This caseIn this case, you know:
number of moles= 30 grams×[tex]\frac{1 mole}{40 grams}[/tex]= 0.75 moles (being 40 [tex]\frac{grams}{mole}[/tex] the molar mass of NaOH)volume= 2.40 LReplacing in the definition of molarity:
[tex]molarity=\frac{0.75 moles}{2.40 L}[/tex]
Solving:
molarity= 0.313 M
Finally, the molarity of the solution is 0.313 M.
Learn more about molarity:
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please help me asap i will mark u as brainly and give u 10 points
7 u
Atomic mass = Mass of protons + mass of neutrons
⇒ Atomic mass = 4 u + 3 u = 7 u.
Tip: Electrons have negligible mass.
Mass of e- = 1/2000 × mass of p+.
Answer:
7
Explanation:
To find the Atomic Mass, you just add the protons and neutrons together.
1. How many times more acidic is Lemon Juice than apples?
(PLEASE HELP)
Analyzing the pros and cons of a decision can help you make a difficult choice. Which of the following is a pro associated with the use of hydropower as an energy source?
A. A large amount of energy can be released by a small amount of fuel.
B. The use of hydropower produces environmentally friendly waste products.
C. Hydropower is a renewable energy source.
D. The chemical reactions involved remove harmful substances from the air.
What controls the DNA molecule?
Answer:
nucleotides
Explanation:
The four types of nitrogen bases found in nucleotides are: adenine (A), thymine (T), guanine (G) and cytosine (C). The order, or sequence, of these bases determines what biological instructions are contained in a strand of DNA. ... DNA is made of chemical building blocks called nucleotides.
hope that helped :)
1) An unlabeled laboratory solution is found to contain a H+ ion concentration of 1 x 10-4
M. What is the OH concentration, [OH-], in the solution?
A) 1 x 10-18 M.
B) 1x 10-14 M.
C) 1 x 10-10 M
D) 1x 10-7 M
Answer:
C) 1 x 10-10 M
Explanation:
To solve this question we must use the equation:
Kw = [H+] [OH-]
Where Kw is the equilibrium dissociation of water = 1x10-14
[H+] is the molar concentration of hydronium ion = 1x10-4M
[OH-] is the molar concentration of hydroxyl ion
Replacing:
1x10-14= 1x10-4 [OH-]
[OH-] = 1x10-14 / 1x10-4M
[OH-] = 1x10-10 M
Right option is:
C) 1 x 10-10 MTwo water molecules are weakly attracted to each other when a slightly positive hydrogen atom in the first molecule is attracted to the slightly negative oxygen atom on the second molecule. What type of bond is this
What is the molarity of a solution that is composed of 10 grams of Sodium Chloride ( NaCl) dissolved in 3.50 L of water
Answer: The molarity of solution will be 0.049 M
Explanation:
Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:
[tex]\text{Molarity of solution}=\frac{\text{Given mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution (L)}}[/tex]
We are given:
Given mass of sodium chloride = 10 g
Molar mass of sodium chloride = 58.44 g/mol
Volume of solution = 3.50 L
Putting values in above equation:
[tex]\text{Molarity of NaCl}=\frac{10 g}{58.44g/mol\times 3.50}\\\\\text{Molarity of NaCl}=0.049M[/tex]
Hence, the molarity of solution will be 0.049 M
What is the molecular weight (rmm) of NaOH?
40
20
50
60
Answer: A/40 it is actually 39.997 but since that is not an answer they rounded up
Explanation:
What is the molarity of a solution containing 9.0 moles of solute in 462 mL of solution
Answer:
[tex]\boxed {\boxed {\sf 19 \ M}}[/tex]
Explanation:
Molarity is a measure of concentration in moles per liter, so the formula is:
[tex]molarity= \frac{moles \ of \ solute}{liters \ of \ solution}}[/tex]
This solution has 9.0 moles of solute and 462 milliliters of solution. We must convert milliliters to liters. Remember that 1 liter contains 1000 milliliters.
Create a ratio.
[tex]\frac{ 1 \ L}{ 1000 \ mL}[/tex]Multiply by the value we are converting: 462 milliliters
[tex]462 \ mL *\frac{ 1 \ L}{ 1000 \ mL}[/tex][tex]462 *\frac{ 1 \ L}{ 1000}[/tex][tex]0.462 \ L[/tex]
Now we know both values and we can solve for the molarity.
moles of solute= 9.0 moles liters of solution = 0.462 L[tex]molarity= \frac{9.0 \ mol}{ 0.462 \ L}[/tex]
Divide.
[tex]molarity= 19.4805195 \ mol/L[/tex]
The original measurements of moles and milliliters have 2 and 3 significant figures respectively. We have to round our answer to the least number of sig figs, which is 2 in this case.
For the number we found, that is the ones place. The 4 in the tenths place (19.4805195) tells us to leave the 9 in the ones place.
[tex]molarity= 19 \ mol/L[/tex]
1 mole per liter is equal to 1 molar or M, so our answer is equal to 19 M.
[tex]molarity \approx 19 \ M[/tex]
The molarity of the solution is approximately 19 M.
definition of spirilla
don't write incorrect answer
Answer:
a bacterium with a rigid spiral structure,found in stagnant water and something causing disease
1. Hay un gas con 700 milímetros de Mercurio de presión en 922 ml de volumen a 20 grados Celsius. Calcula la temperatura final a 500 mm de mercurio con 451 ml.
2. un gas ocupa un gas ocupa 205 mililitros a 20 grados centígrados y 1,05 atm. Calcule el volumen final a 60 grados centígrados y 2,4 Atmósferas de presión.
3. tenemos 22 L de un gas a una temperatura de 220 K y una presión de 5 Atm, si se modifican la presión a 6.5 atm y la temperatura a 200 K, cuál será el volumen que obtenemos.
Answer:
püvinlbxyfsswgrxzvnnchcyv nkivtcdg
What does an increase in temperature do to the reaction rate?
Answer:
An increase in temperature typically increases the rate of reaction because an increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision.Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction.
Explanation:
Can you please give this answer a brainliest answer please
answer questions 3 and 4 for a brainly!
Answer:
The correct answer is -
3. Butyne
4. Pentene
Explanation:
The names of such organic compounds are classified on the number of the carbon atoms and based on a number these prefixes are attached -
Meth - one carbon
Eth - two carbons
Prop - three carbons
But - four carbons
Pent - five carbons, and so on
The bonds can be identified by names of an organic compound by their suffixes -
- ane = single bond
- ene = double bond
-yne = triple bond
Thus, for question 3, carbon numbers are 4 and triple bond so Butyne, and similarly for question 4, 5 carbon atoms and double bond so Pentene.
How many miles are in 27.4 g of NO2
Answer:
0.59 moles
Explanation:
Given mass = 27.4 g
Molar mass of NO₂ = 46 g/mol
We need to find the number of moles. We know that,
No of moles = given mass/molar mass
Put all the values,
[tex]n=\dfrac{27.4}{46}\\\\n=0.59[/tex]
Hence, there are 0.59 moles of NO₂ .
Sam is visiting the desert. He is standing beside a cactus watching a
snake move across the sand. There is a lizard basking in the sun on a rock
nearby. Which of the following correctly identifies the biotic and abiotic
parts of the ecosystem?
Abiotic: Rock, Sand, Sun Biotic: Cactus, Lizard, Sam, Snake
Abiotic: Cactus, Rock, Sam Biotic: Lizard, Sand, Snake, Sun
Abiotic: Cactus, Rock, Sand, Sun Biotic: Lizard, Sam, Snake
Abiotic: Cactus, Lizard, Sam, Snake Biotic: Rock, Sand, Sun
Answer:
A
Explanation:
Rock sand sun arent living. cactus lizard sam and snake are living or biotic
5.(08.02 MC)
A 0.680 M Ca(OH)2 solution was prepared by dissolving 55.0 grams of Ca(OH)2 in enough water. What is the total volume of the solution formed? (4 points)
O 1.09 liters
0 1.23 liters
2.01 liters
O 2.18 liters
Answer: 1.09 Liers
Explanation:
I did the problem and got it correct.
Answer:
A. 1.09
Explanation:
I did the Chemistry Exam