Answer:
Weigh 80g of Sodium chloride and dissolve it in 100ml of water.
Explanation:
The formula for weight percent (w/v) is: [Mass of solute (g) / Volume of solution (ml)] x 100. This is used to prepare a solution of a solid in a liquid.
To prepare 80% solution of sodium chloride in water, 80g of sodium chloride is dissolved in 100ml of water according to the formula above. 80g of sodium chloride is measured in an appropriate weighing balance and carefully transferred to a standard flask and made up to the 100ml mark.
A farmer has a large field with one type of
crop. This area has high biodiversity.
Agree
Disagree
Answer:
Disagree
Explanation:
Biodiversity is having a variety, or a diversity of life. Having one crop is not a variety, therefore this field does not have high biodiversity.
In the terms of biodiversity, a large field planted with only one type of crop does not display high biodiversity. This creates a monoculture, not diverse, and more prone to disease and pests due to lack of genetic diversity.
Explanation:In the context of biodiversity, a large field with only one type of crop is not considered highly diverse. Biodiversity refers to the variety of life within an ecosystem, habitat, or a specific geographic area. It includes all the different types of genes, species, and ecosystems. A field with just one type of crop results in a monoculture, which is the opposite of biodiversity.
Monocultures are more susceptible to pests and diseases because there is a lack of genetic diversity. On the other hand, high biodiversity usually means more stability in an ecosystem, with increased resilience against environmental changes and disturbances.
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Which goes with this phase days after the rainstorm the playground is now dry
Balance N2 + H2 —NH3 what type of reaction
5.00 L of a gas is collected at 100K and then allowed to expand to 20.0 L. What must the new temperature
be in order to maintain the same pressure?
A. 400 °C
B. 127 °C
C. 223 °C
D. 627°C
Answer: Option B) 127 °C
Explanation:
Initial volume of gas V1 = 5.00 L
Initial temperature of gas T1 = 100K
New volume of gas V2 = 20.0 L
new temperature of gas T2 = ?
Since volume and temperature are involved while pressure is constant, apply the formula for Charles law
V1/T1 = V2/T2
5.00 L/100K = 20.0 L/T2
cross multiply
5.00 x T2 = 100 x 20.0
5.00T2= 2000
T2 = 2000/5.00
T2 = 400K
Convert temperature in Kelvin to Celsius
(400K - 273) = 127°C
Thus, the new temperature of the gas is 127°C
What is the random mixing of gas molecules called?
O
A. Diffusion
O B. Volume
O.C. Temperature
OD. Pressure
what does calibrating the cabbage pH indicator mean
Answer:
Calibrating the cabbage pH indicator means creating a color key based on solutions that have known pH values.
Explanation:
Answer: 1st a
2nd b, d
3rd a
Explanation:
Rocks, as they are compressed, begin forming mountains above the Earth's surface when two continental plates converge.
The continental crust increases in depth as the mountains grow above. The Himalayan Mountains formed at a convergent
plate boundary in this manner. The rocks are smashed together causing them to
due to the intense heat and
pressure from the colliding plates and eventually forming
rock.
melt; igneous
layer; sedimentary
recrystallize; metamorphic
melt into the Earth's interior; metamorphic
Final answer:
Continental plates colliding under intense pressure and heat cause existing rocks to recrystallize into metamorphic rocks, contributing to the formation of mountain ranges such as the Himalayas.
Explanation:
When two continental plates converge, the intense pressure and heat they generate cause the existing rocks at the plate boundary to recrystallize, forming metamorphic rocks. This process, often associated with mountain building, is evident in the formation of the Himalayan Mountains at such a convergent plate boundary. Between colliding continental masses, like the African plate and the Eurasian plate forming the Alps, or the Asian and Arabian plates creating the Zagros Mountains, the pressure and heat metamorphose the rocks in the mountain chains. The creation and the shaping of these mountains are not solely due to tectonic forces but are also significantly affected by volcanic activity and erosion by elements like water and ice over time.
11. If you have three moles of S., how many moles of Als, can be produced?
Answer:3
Explanation:
The three moles of S are divided by the moles in your product in this case 1 (AlS)
3/1=3
In standardization of NaOH solution, a student found that 25.55cm3 of base neutralized exactly 21.35cm3 of 0.12M HCl. Find the molarity of the NaOH.
Answer:
0.1M
Explanation:
We'll begin by writing a balanced equation for the reaction between HCl and NaOH. This is illustrated below:
HCl + NaOH —> NaCl + H2O
From the above equation, we obtained:
nA (mole of the acid) = 1
nB (mole of the base) = 1
Data obtained from the question include:
Ma (Molarity of the acid ) = 0.12M
Va (volume of the acid) = 21.35cm3
Mb (Molarity of the base) =?
Vb (volume of the base) = 25.55cm3
Using the equation MaVa/MbVb = nA/nB, the molarity of the base can be obtained as follow:
MaVa/MbVb = nA/nB
0.12 x 21.35 / Mb x 25.55 = 1
Cross multiply to express in linear form.
Mb x 25.55 = 0.12 x 21.35
Divide both side by 25.55
Mb = (0.12 x 21.35)/25.55
Mb = 0.1M
Therefore, the molarity of the base (NaOH) is 0.1M
The molarity of the NaOH solution is calculated using the titration method. Given that 25.55 cm3 of base neutralized 21.35 cm3 of 0.12M HCl, the molarity of NaOH was calculated to be 0.1 M.
Explanation:
In the standardization of NaOH solution, we use the concept of titration where a known concentration of an acid, in this case HCl, is used to find out the concentration of a base, which is NaOH here. During this process, the volume of the base that neutralizes a given amount of acid is measured. From the given data, we know that 25.55 cm3 of base neutralized 21.35 cm3 of 0.12M HCl.
Given that, the stoichiometry of the reaction between HCl and NaOH is 1:1, the moles of HCl used can be calculated using the formula:
moles = Molarity * Volume (in litres)
Therefore, moles of HCl = 0.12 M * 21.35 cm3 / 1000 = 0.002562 mol
Since the reaction is 1:1, the moles of NaOH would be the same, i.e., 0.002562 mol.
The molarity of NaOH can then be calculated using the formula:
Molarity = Moles / Volume (in litres)
So, Molarity of NaOH = 0.002562 mol / 25.55 cm3 x 1000 = 0.1 M
Therefore, the molarity of the NaOH solution is 0.1 M.
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For the formation of ammonia, NH3, the enthalpy of reaction is shown:
3H2(g) + N2(g) --> 2NH3(8)
AH = -45.9 kJ
How much energy is required to convert ammonia back to hydrogen and nitrogen?
Answer: The amount of energy required to convert ammonia back to hydrogen and nitrogen is 45.9 kJ
Explanation:
Endothermic reactions are defined as the reactions in which energy is absorbed in the reaction. The enthalpy change of the reaction is positive.
Exothermic reactions are defined as the reactions in which energy is released in the reaction. The enthalpy change of the reaction is negative.
For the given chemical equation:
[tex]3H_2(g)+N_2(g)\rightarrow 2NH_3(g);\Delta H=-45.9kJ[/tex]
In the above reaction, the enthalpy change is negative. So, the reaction is exothermic in nature.
For the reverse reaction, the magnitude of the enthalpy change remains the same but sign for it changes.
Hence, the amount of energy required to convert ammonia back to hydrogen and nitrogen is 45.9 kJ
most radioactive place on earth
Answer: Ramsar, Iran (happy to help)
Explanation:
How many grams of sodium bromide must be dissolved in 400.0 g of water to produce a 0.500 molar solution?
A20.0 g
B52.18
C2.00 g
D20.6 g
Answer:
D. 20.6g
Explanation:
Molarity is defined as ratio between moles of solute (sodium bromide, NaBr) per liter of water.
As density of water is 1g/mL; volume of 400.0g of water is 400.0mL = 0.4000L.
That means 0.400L of 0.500M solution contains:
0.400L × (0.500mol / 1L) = 0.200moles of sodium bromide.
In mass (NaBr = 102.9g/mol):
0.200mol NaBr × (102.9g/mol) = 20.6g of NaBr
Right answer is:
D. 20.6g
If you're good with covalent bonds please help.
Answer:
[tex]SiS_2[/tex]: Silicon disulfide
[tex]NBr_3[/tex]: Nitrogen tribromide
[tex]N_2Cl_4[/tex]: Dinitrogen tetrachloride
Explanation:
Whenever you have an binary compound such as this, you can look at the individual elements for the name. The first word will simply be the prefix + the name of the element.
*** Notice you don't need to put a prefix if theres only 1. This is understood as mono. Only on the first word.
For the second word, its simply the root + ide.
hi:) are electrostatic forces ionic bonding? I’m kinda confused :/
Answer:
Yes indeed BRUVA!!!! Electrostatic is a term used to describe the charges of the ionic compound
1. If 400 grams of C2H6O2 is added to 4,000 g of water, calculate the molality?
Answer:
1)1.61molKg-1
Explanation:
we find the molality using the formula mole of solute/Kg of solvent..
You have a balloon filled with hydrogen gas
which keeps it at a constant pressure,
regardless of its volume. The initial volume of
the gas is 736 mL at 15.0°C. The gas is heated
until its volume is 2.28 L, what is its final
temperature in degrees Celsius?
Answer:
619.2 K
Explanation:
We can solve this problem by using Charle's Law, which states that:
"For a fixed mass of an ideal gas kept at constant pressure, the volume of the gas is directly proportional to its absolute temperature"
Mathematically:
[tex]V\propto T[/tex]
where
V is the volume of the gas
T is the absolute temperature
The equation can be rewritten as follows for a gas that undergoes a transformation at constant pressure:
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
where in this problem:
[tex]V_1=736 mL = 0.736 L[/tex] is the initial volume of the gas
[tex]T_1=15.0C+273=288 K[/tex] is the initial temperature
[tex]V_2=2.28 L[/tex] is the final volume of the gas
Solving for T2, we find the final temperature:
[tex]T_2=\frac{V_2 T_1}{V_1}=\frac{(2.28)(288)}{0.736}=892.2 K[/tex]
Converting into Celsius degrees,
[tex]T_2=892.2-273=619.2 K[/tex]
Answer:
619
Explanation:
it takes of the 0.2 on CK12
Coconut oil is commonly used as a fuel. Palmitic acid is the primary ingredient that produces the heat. Balance the combustion reactions for palmitic acid.
C16H32O2 + O2 → CO2 + H2O
Answer:
The answer is C16H32O2 + 23 O2 ---> 16CO2 + 16H2O
Explanation:
Answer:
blank, 23, 16 , 16
Explanation:
look at my ss
What’s earths relation to the sun during June solstice and December solstice
During the June solstice, the Northern Hemisphere is tilted towards the Sun resulting in longer days; vice versa for the December solstice when the Southern Hemisphere experiences summer.
During the June solstice, which occurs around June 21, the Earth's Northern Hemisphere is tilted toward the Sun.
This results in the North Pole experiencing 24 hours of daylight, while the Sun's rays are directly over the Tropic of Cancer.Conversely, during the December solstice, around December 21, the Northern Hemisphere tilts away from the Sun, causing shorter days and longer nights.
At this time, the Southern Hemisphere enjoys summer as it leans into the Sun, with the Sun's rays hitting directly over the Tropic of Capricorn. The South Pole experiences 24 hours of daylight.June Solstice: Northern Hemisphere tilted towards the Sun, maximum sunlight at the Tropic of Cancer.
December Solstice: Northern Hemisphere tilted away from the Sun, maximum sunlight at the Tropic of Capricorn.
A scientific theory never changes. ture or false ?
Answer:
False.
Explanation:
Scientific theories and hypothesis are all tentative. Science tries to prove something is either true of false and come up with answers (as much as we can) for many problems. Sometimes they are made based on limited data or information. Over the years, we come up with need findings discoveries which are able to give us more information and give us better answers. There have been a couple of scientific laws which had to be completely revised or discarded after new observations. An example of this would be the Laws of Thermodynamics. A couple of the laws have been changed over the decades after scientists made new disoveries and observations.
What’s the answer for this ?
Answer: Open System
Explanation: It's an open system because the "Cup" is literally exposed to the surroundings. It will lose heat or gain heat or any other type of energy in its surroundings.
The combustion of 1.760 g of propanol (C3H7OH) increases the temperature of a bomb calorimeter from 298.00K to 302.15K. The heat capacity of the bomb calorimeter is 14.24 kJ/K. Determine ΔH for the combustion of propanol to carbon dioxide gas and liquid water in kJ/mol.
Final answer:
To find the ΔH for the combustion of propanol, the heat released is calculated with the calorimeter's heat capacity and temperature change, and then scaled to a per-mole basis.So,combustion of propanol to carbon dioxide gas and liquid water in kJ/mol was -2012.45 kJ/mol.
Explanation:
The question involves finding the ΔH (enthalpy change) for the combustion of propanol (C3H7OH). To calculate the enthalpy change of the reaction, we first need to calculate the heat released (q) during the combustion using the formula: q = C × ΔT, where C is the heat capacity of the calorimeter and ΔT is the change in temperature.
Using the provided data, the heat released by the combustion is:
q = 14.24 kJ/K × (302.15K - 298.00K)
This results in q = 59.288 kJ (rounded to three decimal places), which is the heat released when 1.760 grams of propanol are burned. To find ΔH per mole of propanol, we need the molar mass of propanol (C3H7OH), which is approximately 60.10 g/mol. Thus, we can calculate ΔH using the proportion:
ΔH (per mole) = q (per 1.760 g) × (60.10 g/mol / 1.760 g).
The final calculation yields ΔH as -2012.45 kJ/mol (rounded to two decimal places).
What are eggshells made of?
Answer:
Eggshell is made almost entirely of calcium carbonate
Explanation:
What are the functional groups in oxybenzone?
Answer:
Oxybenzone contains ether, phenol and ketone (-CO) functional group alonq with two aromatic rings.
Explanation:
Answer: apply to almost every part of your body especially like
Explanation: the ears , scalp, back of the neck , and top of the feet , and back of heels.
The mass of an electron is
A. equal to the proton mass plus the neutron mass
B. the smallest of the three major particles
C. the same as the mass of the proton
D. the same as the mass of the atom
Answer:
B
Explanation:
technically an electron has a very negligible mass
please like and Mark as brainliest
Please help me! greatly appreciated
Answer: The answer is a B) Compound
Explanation:A compound is when two things are mixed together and steel is made of iron and carbon mixed together.
Pleassssdseee help meee
What is the unit of measure for energy?
O watt
O newton
O joule
0 meters per second
The unit of measurement for energy is Joule (J) (3rd Option)
What is energy?Energy is simply defined as the ability to work.
Unit of measurement for energyThe system of international (SI) unit for the measurement of energy is Joule (J). Other unit of measurement is kilojoule (KJ), megajoule (MJ) etc
Forms of energyThere are various forms of energy. This includes:
Mechanical energy Solar energy Electrical energy Sound energy Chemical energy etcAll forms of energy are measured in Joule (J)
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Answer:
joules
Explanation:
quiz on edg. 2022
Why do you need to know the balanced chemical equation before calculating the amount of a compound needed to neutralize an acid or a base?
Answer: To determine the mole ratio
Explanation:
A balanced chemical equation is needed ,because it helps to determine the mole ratio of acid and base.
The mole ratio ensures that the number of moles of H+ provided by the acid is equal to number of moles of OH- ion provided by the base, For neutralization to occur, this must be the case.
An electric current can be best conducted by
Answer:
a metal
Explanation:
metals are good conductors of electricity.
A chemist must dilute 34.3mL of 1.72mM aqueous calcium sulfate solution until the concentration falls to 1.00mM. He'll do this by adding distilled water to the solution until it reaches a certain final volume.
Calculate this final volume, in milliliters. Round your answer to 3 significant digits.
To dilute the calcium sulfate solution, use the dilution formula to calculate the final volume, which is approximately 58.7mL.
Explanation:To dilute the 1.72mM aqueous calcium sulfate solution to 1.00mM, we can use the dilution formula:
C1V1 = C2V2
Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume. Rearranging the formula, we have:
V2 = (C1V1) / C2
Plugging in the values: C1 = 1.72mM, V1 = 34.3mL, C2 = 1.00mM, we can calculate the final volume:
V2 = (1.72mM * 34.3mL) / 1.00mM = 58.732mL
Rounding to 3 significant digits, the final volume is approximately 58.7mL.
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