Answer:
I would say A
Explanation:
our ancestors are the people that lived long before us
3. How many grams of
CoCl, in 1/2 Liter would be
used to make a 1.0 molar
solution?
Answer:
47 grams CoCl needed.
Explanation:
1 mole weight of CoCl in 1 Liter solution => 1.0 molar solution
∴ 1/2 mole weight of CoCl in 1/2 Liter solution => 1.0 molar solution.
1/2 mole weight of CoCl = 1/2(94 g/mole) = 47 grams CoCl needed.
Final answer:
To make a 1.0 molar solution of CoCl₂ in half a liter of water, you would need 64.915 grams of CoCl₂, using its molar mass of 129.83 g/mol.
Explanation:
The question you are asking is about making a 1.0 molar solution of cobalt(II) chloride, CoCl₂, in 1/2 liter of water. To calculate the amount of CoCl₂ required, we will use the formula:
mass (grams) = molarity (mol/L) × volume (L) × molar mass (g/mol).
First, we need to establish the molar mass of CoCl₂. Cobalt has an atomic mass of about 58.93 g/mol, and each chlorine has an atomic mass of about 35.45 g/mol. So, the molar mass of CoCl₂ is:
58.93 g/mol (for Co) + 2 × 35.45 g/mol (for Cl) = 129.83 g/mol.
Now, we can calculate the required mass of CoCl₂ for a 1.0 M solution:
mass = 1.0 mol/L × 0.5 L × 129.83 g/mol = 64.915 grams.
Therefore, you would need 64.915 grams of CoCl₂ to make a 1.0 molar solution in half a liter of water.
Calculate the volume of a 3.50 M solution of H2SO4 made from 49 g of H2SO4
Answer:
0.143L
Explanation:
Molar mass of H2SO4 = 98g/Mol
No of mole = mass/molar mass
No of mole= 49/98 = 0.5 mol
No of mol = concentration × volume
Volume = n/C = 0.5/3.5 = 0.143L
Which of these is a problem with using nuclear energy?
A.
It is very expensive to use.
B.
It is a non-renewable energy source.
C.
There aren't enough qualified technicians.
D.
We don't have a way to contain the radioactive waste produced.
Answer:
I think the answer is B
Explanation:
Nuclear energy is usually considered a non-renewable energy source. Although uranium is found in rocks all over the world, nuclear power plants usually use a very rare type of uranium, U-235. Uranium is a non-renewable resource.
1. A crane lifts 300.5 kg to a platform that is 1.9 m above the ground. How much work is done? (HINT: 1" convert the
mass (kg) into newtons (force), then solve for work.)
Answer:
Work = 5595.31J
Explanation:
Mass = 300.5kg
Distance (h) = 1.9m
Acceleration due to gravity (g) = 9.8m/s²
Work done on an object is the product of the force applied over the distance the object is moved.
Work = force * distance
Force = mass * acceleration (a or g)
F = m* g
F = 300.5 * 9.8
F = 2944.9N
Workdone = force *distance
Work = 2944.9 * 1.9
Work = 5595.31J
The work done is 5595.31J
if a banana is a fruit what type of tree does it come out of?
Answer:
I don't know what?
Explanation:
Answer:
They don’t grow from a tree
Explanation:
They grow from a root system that produces an a over ground structure resembling a stalk
the banana tree is technically an herbaceous plant
If 0.214 mol of argon gas occupies a volume of 343.4 mL at a particular temperature and pressure, what volume would 0.375 mol of argon gas occupy under the same conditions?
Answer:
601.8mL
Explanation:
First, we'll begin by obtaining an equation connecting volume and number of mole together. This is illustrated below:
From the ideal gas equation:
PV = nRT
Divide both side by P
V = nRT/P
Now divide both side by n
V/n = RT/P
Under the same conditions simply means temperature(T), pressure (P) and the gas constant (R) are all constant i.e
RT/P => constant
Therefore, the above equation can be written as:
V1/n1 = V2/n2
Now we can solve for the final volume otherwise known as the new volume as follow:
Data obtained from the question include:
n1 (initial mole) = 0.214 mol
V1 (initial volume) = 343.4 mL
n2 (final mole) = 0.375 mol
V2 (final volume) =?
Applying the the equation V1/n1 = V2/n2, the final volume is obtain as illustrated below:
V1/n1 = V2/n2
343.4/0.214 = V2/0.375
Cross multiply to express in linear form
0.214 x V2 = 343.4 x 0.375
Divide both side by 0.214
V2 = (343.4 x 0.375)/0.214
V2 = 601.8mL
Therefore, 0.375 mol of argon gas will occupy 601.8mL under the same condition.
How many representative particles are in 1.45 g of a molecular compound with a molar mass of 237 g?
Answer:
3.683×10^21 particles
Explanation:
Number of particles in a substance = (mass of the substance/molar mass of the substance)×Avogadro's number
Given;
Mass of compound =1.45g
Molar mass of compound =237g
Avogadro's number=6.02×10^23
Therefore, number of particles = (1.45/237)×6.02×10^23
=3.683×10^21 particles
Answer:
3.68•10^21 particles (correct to 3SF)
Explanation:
1.45 • xg molecular compound • 1mol/237g • (6.02•10^23)/ 1 mol = 3.6831•10^21 representative particles
*6.02•10^23 is Avagadro's number
At dinner your brother got mad and threw your burrito at a speed of 4 m/s. It flies for 18 seconds trough the air. How much distance did the burrito cover?
Answer:
Distance = 72 meters.
Explanation:
Given data:
speed of burrito = 4 meter/ second
Time taken in flight = 18 seconds.
Required: The distance covered during this time and having the above speed by the burrito.
Solution :
Formula of speed is given below.
Speed = distance / time interval
By putting the values of speed and time, we get,
4 meter / second = distance / 18 seconds.
Multiply 18 both, we get
4 x 18 = distance
Distance = 72 meters.
In a flexible container , 15.9 L of gas is under 589 kPa of pressure at a temperature of 56.5 degrees * C . If the pressure and temperature change to STP , what is the new volume ? A 10.2 B 92.4L 112 D 76.6 L
76.6 litres is the volume of the gas if pressure and temperature changes to STP.
Explanation:
Data given:
Volume of the gas V1 = 15.9 litres
pressure of the gas P1 = 589 kPa or 5.81 atm.
temperature T1 = 56.5 degrees or 329.3 K
Final pressure P2 = 101.3 kPa
Final temperature T2 = 273 K
At STP the pressure is 1 atm or 101.3 kPa and the temperature is 273 K. So from the question the final temperature and pressure is at STP.
from Gas Law:
[tex]\frac{P1V1}{T1}[/tex] = [tex]\frac{P2V2}{T2}[/tex]
V2 = [tex]\frac{P1V1T2}{P2T1}[/tex]
Putting the values in the above rearranged equation of Gas Law:
V2 = [tex]\frac{589 X 15.9 X 273}{329.3X 101.3}[/tex]
= 76.6 Litres
If the pressure and temperature change to STP, the new volume will be "76.6 liters".
Pressure and TemperatureAccording to the question,
Initial pressure, P₁ = 589 kPa or,
= 5.81 atm
Final pressure, P₂ = 101.3 kPa
Initial volume, V₁ = 15.9 L
Initial temperature, T₁ = 56.5° or,
= 329.3 K
Final temperature, T₂ = 273 K
By using the Gas law,
→ [tex]\frac{P_1 V_1}{T_1} =\frac{P_2 V_2}{T_2}[/tex]
or, the new volume be:
→ V₂ = [tex]\frac{589\times 15.9\times 273}{329.3\times 101.3}[/tex]
= 76.6 L
Thus the above approach is correct.
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Lakes can disappear due to _
A. Condensation
B. Transpiration
C. Eutrophication
D. Photosynthesis
Answer:
i think it's eutrophication
Lakes can disappear due to Eutrophication, which is a biological process where a buildup of nutrients causes rapid plant growth. When these plants die and decompose, the oxygen in the water is consumed, leading to the disappearance of the lake over time.
Explanation:Lakes can disappear due to various natural phenomena, but particularly due to Eutrophication. This is a biological process, where a buildup of nutrients can cause rapid plant growth, particularly algae, in the lake. As these plants die and decompose, bacteria thrive and consume oxygen in the water, thereby making it uninhabitable for aquatic life. Continued eutrophication can eventually lead to a lake losing its water and becoming a marsh or dry land.
Condensation, Transpiration, and Photosynthesis do not directly contribute to the disappearance of lakes, as these processes are part of the water cycle and the energy balance in ecosystems, respectively.
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determine the molarity of a solution that has 0.267 mol of solute dissolved in 2.25 Liters of solution
Answer:
0.11866M
Explanation:
molarity is mol/L
0.267 mol/2.25L = 0.1186666...
round depending on how many digits you need
Marcia is given an incomplete chemical equation that includes the number of nitrogen atoms present in the products of the reaction. How can she conclude that the reaction started with three nitrogen atoms?
Answer: There would have to be three nitrogen atoms in the products. The law of conservation of matter states that the amount of substance before a reaction occurs should be the same as the amount of substance after the reaction.
Explanation: This is the EXACT sample answer from the test, just reword it if you want. ^
According to the law of conservation of mass, Marcia can conclude that reaction started with 3 nitrogen atoms as mass of reactants and products are equal as per the law of conservation of mass.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass can neither created nor destroyed rather it can be restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional to each other which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.
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Fill in each blank with the correct word.
The male reproductive cell is called a(n)
The female reproductive cell is called a(n)
When the male and female reproductive cells join during fertilization, a
forms.
Final answer:
The male reproductive cell is known as a sperm, and the female counterpart is an egg. They are both gametes, which are haploid cells vital for sexual reproduction. During fertilization, these cells combine to form a diploid cell called a zygote, initiating embryo development.
Explanation:
The male reproductive cell is called a sperm. The female reproductive cell is called an egg. When the male and female reproductive cells join during fertilization, a zygote forms.
Sexual reproduction involves the union of a male and a female gamete. Gametes are haploid cells, each carrying 23 chromosomes—half the number found in other body cells. The process of gametogenesis includes spermatogenesis and oogenesis, where sperm and eggs are produced respectively. In males, this occurs in the testes, often highlighted in figures on the male reproductive system, such as the one labeled Figure 27.2. During spermatogenesis, sperm acquire a tail and the ability to swim, essential for reaching the female gamete. The female counterpart, oogenesis, results in a single large egg from the initially formed four haploid cells.
Upon fertilization, a sperm cell and an egg cell unite to form a zygote, a diploid cell that contains a complete set of chromosomes, one set from each parent. This diploid cell marks the start of a new organism and it divides by mitosis as it travels to the uterus, eventually developing into an embryo.
The illustration shows the path of a laser leaving a laser pointer. At what point is the laser being absorbed?
Answer:
D not c
Explanation:
The point showing the laser being absorbed is D.
What is Laser?LASER stands for “Light Amplification by Stimulated Emission of Radiation”
Lasers not only increase the intensity of light but also generate light. Lasers emit light by stimulated emission of radiation, which increases the intensity of radiation. Some lasers produce visible light, and some produce ultraviolet or infrared rays.
The laser light exhibits some peculiar properties compared with the conventional light which make it unique.
Therefore, The point showing the laser being absorbed is D.
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Have heat waves ever affected the world in a way? Explain.
Answer: Yes, they have.
Explanation: The frequency, severity, and length of heat waves are increasing. Heat and humidity already kill an average of 1,300 people in the U.S. each year. Deadly heat waves of at least 20 days affect 30% of the earth's population. That will increase to 75% by 2100 if global warming isn't stopped.
What role does genetic variation play in the existence of an organism?
Listed in the Item Bank are some key terms and expressions associated with the categories seen in the Venn Diagram. To find out more information about items, some have more details available when you click on them. Drag and drop each item onto the proper area of the diagram. If an item describes more than one category, be sure to place it in the overlapping space.
(This is for a USA TEST PREP)
In the Venn Diagram:
- "DNA replicates" goes under "Cell divides once".
- "4 Daughter cells" is placed under "Cell divides twice".
- "Growth and repair" can be in the overlap of "Asexual Reproduction" and "Both Sexual Reproduction".
In the Venn Diagram:
- "DNA replicates" would go under the category "Cell divides once" as DNA replication typically occurs before cell division.
- "4 Daughter cells" would be placed under the category "Cell divides twice" as it indicates a cell division process resulting in four daughter cells.
- "Growth and repair" can be placed in the overlapping space of "Asexual Reproduction" and "Both Sexual Reproduction" as both types of reproduction involve growth and repair processes.
The probable question maybe:
Listed in the Item Bank are some key terms and expressions associated with the categories seen in the Venn Diagram. To find out more information about items, some have more details available when you click on them. Drag and drop each item onto the proper area of the diagram. If an item describes more than one category, be sure to place it in the overlapping space. ITEMBANK: Move to Bottom 2 Daughter cells DNA replicates 4 Daughter cells Cell divides once Cell divides twice Growth and repair Asexual Reproduction Both Sexual Reproduction drag and drop answer here drag and drop answer here drag and drop answer here
Which of the following statements best describes what happens to water during vaporization?
A. The temperature of the water increases until the water molecules react with nitrogen in the air.
B. Water molecules overcome intermolecular forces and change into the gas phase.
C. Water molecules steadily increase in kinetic energy and gradually become further apart.
D. The temperature of the water increases until the water molecules separate into oxygen and hydrogen gas.
Answer: im pretty sure its D
Explanation:
According to intermolecular forces of attraction, statement which best describes what happens to water during vaporization is 'B'.
What are forces of attraction ?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Answer this question in 2-3 sentences.
How is it possible that the water you are drinking today, is the same water the dinoaurs drank????
Answer ASAP
Extra Points!
Will mark brainiest
Meteorologists in New York City are tracking a hurricane that is approaching the city. What type of instrument or system are these meteorologists most likely using?
a ground station
a weather buoy
a ship
a satellite
a. Adding or removing gas to a constant volume. What happens to the pressure? Is this a
direct or indirect relationship?
I think the answer is direct
what happens if 0.87 mol NaCl is dissolved in pure water creating 3.00 L of solution, what is its molarity of the resulting solution?
Answer:
0.29 molL-1 or 0.29 M
Explanation:
Now we have to use the formula
n=CV
Where
n= number of moles = 0.87 moles
C= concentration of the solution (the unknown)
V= volume of the solution = 3.00L
Now having specified all parameters except the unknown (molarity if the sodium chloride solution) we can now proceed to find it.
C= n/V
C= 0.87mol/3.00L
C= 0.29 molL-1
Answer:
0.29 mol/L
Explanation:
When sodium chloride (NaCl) is dissolved in water, it will dissociates to produce sodium ion (Na+) and chloride ion (Cl-) in solution as shown below:
NaCl —> Na+ + Cl-
Next, let us calculate the molarity of NaCl. This is illustrated below:
Mole of NaCl = 0.87 mole
Volume of solution = 3 L
Molarity =?
Molarity = mole of solute /Volume
Molarity = 0.87mole /3L
Molarity = 0.29 mol/L
Therefore, the molarity of NaCl is 0.29 mol/L
19 points:
The chemical reaction represented by the following balanced chemical equation takes place in aqueous
solution: MnO4 + 5 Fe2+8H - Mn2 + 5 Fe3+ 4H2O
When the disappearance of the permanganate ion, MnO4, is monitored, the rate of reaction for the
consumption of the ion is 4.0x10^2 mol/L.s. Calculate the reaction rate for all other reactants and products.
Answer:
Explanation:
MnO₄⁻ + 5 Fe2⁺ + 8H⁺ = Mn⁺² + 5Fe⁺³ + 4H₂O.
- d [MnO₄⁻ ] / dt = 4 x 10² mol /L.s.
- [ Fe²⁺ ] / dt = 5 x - d [MnO₄⁻ ] / dt
= 5 x 4 x 10² mol /L.s.
20 x 10²
- d [ H⁺] / dt = 8 x - d [MnO₄⁻ ] / dt
= 8 x 4 x 10²
= 32 x 10² mol /L.s.
+d [ Mn⁺² ] / dt = - d [MnO₄⁻ ] / dt
= 4 x 10² mol /L.s
+d [ Fe⁺³ ] / dt = 5 x - d [MnO₄⁻ ] / dt
= 20 x 10² mol /L.s
Which elements have similar behavior?
A. Barium
B. Silicon
C. Aluminum
D. Strontium
E. Osmium
F. Beryllium
Answer:
The elements which have similar behavior are Barium, strontium and beryllium.
The elements that have similar behavior are Barium, strontium, and beryllium. The correct options are A, D, and F.
What are chemical elements?Chemical elements are substances present in the periodic table. There are 118 elements in the periodic table. All elements are arranged according to the atomic numbers of the elements.
Barium, strontium, and beryllium belong to the same group of the periodic table. They are called alkaline earth metals. They are very reactive at room temperature. These metals are all white, silvery, and shiny metals.
Alkaline earth metals have two electrons in their outer shell. Which gives them the same oxidation number, which is 2+. Alkaline earth metals have beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
Thus, the correct options are A, Barium, D, Strontium, and F, Beryllium.
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What is the mass of solute in a 500 mL solution of 0.200 M
sodium phosphate (Na3PO4: M.W. 164.0)?
16.4 grams is the mass of solute in a 500 mL solution of 0.200 M .
sodium phosphate
Explanation:
Given data about sodium phosphate
atomic mass of Na3PO4 = 164 grams/mole
volume of the solution = 500 ml or 0.5 litres
molarity of sodium phosphate solution = 0.200 M
The formula for molarity will be used here to know the mass dissolved in the given volume of the solution:
The formula is
molarity = [tex]\frac{number of moles of solute}{volume in litres}[/tex]
putting the values in the equation, we get
molarity x volume = number of moles
0.200 X 0.5= number of moles
number of moles = 0.1 moles
Atomic mass x number of moles = mass
putting the values in the above equation
164 x 0.1 = 16.4 grams
16.4 grams of sodium phosphate is present in 0.5 L of the solution to make a 0.2 M solution.
The mass of solute in 500mL solution is 16.4 grams. The number of moles can be calculated by using Molarity formula to find Mass of the solute.
Given:
Atomic mass of Na3PO4 = 164 grams/mole
Volume of the solution = 500 ml or 0.5 litres
Molarity of sodium phosphate solution = 0.200 M
Calculation of Molarity:The formula for molarity will be used here to know the mass dissolved in the given volume of the solution:
Molarity = Number of solute / Volume of solution
Molarity * volume = number of moles
0.200 * 0.5= number of moles
Number of moles = 0.1 moles
Mass= Atomic mass * number of moles
On subsituting:
164 * 0.1 = 16.4 grams
16.4 grams of sodium phosphate is present in 0.5 L of the solution to make a 0.2 M solution.
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what is the chemical formula for sodium oxide?
Answer:
Na20
Explanation:
I did a quick google search and it was right there lol
Answer:
It would be Na20 please mark brainliest have a nice day
When the DNA changes from AGT TAC CCG ATT to AGT TAG CCC GAT, what type of mutation has occurred?
A)Translocation
B)Point
C)Deletion
D)Insertion
When the DNA changes from AGT TAC CCG ATT to AGT TAG CCC GAT,
Translocation occur.
What is translocation of DNA?a type of genetic alteration when a segment of one chromosome separates and joins another. Chromosomes from different species can occasionally swap portions with one another.
Deoxyribonucleic acid (DNA) exists an organic chemical that contains genetic information and teachings for protein synthesis. It exists located in most cells of every organism. DNA exists as a key part of reproduction in which genetic heredity happens via the passing down of DNA from parent or parents to offspring.
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Which reactant will be in excess, and how many moles of it will be left over?
Answer:
Oxygen and 0.36
Explanation:
Oxygen is usually always in excess and you use the math to find the 0.36
Describe how to prepare a 80% solution of salt water (NaCl).
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.
C6H1206 +602 → 6002 + 6H20 AH = -2,799 kJ
How much energy is given off when 100.0 g of C6H1206 react?
Answer:
C^6 H^1206, 602,6002, 6H ^20, 2799 AHkJ, 100g C^6 H^1206
Explanation: