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.
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
Which statement is true?
In an exothermic reaction, the energy of the products is the same as the energy of the reactants.
In an endothermic reaction, the energy of the products is less than the energy of the reactants.
In an exothermic reaction, the energy of the products is less than the energy of the reactants.
In an endothermic reaction, the energy of the products is the same as the energy of the reactants.
Answer:
C
In an exothermic reeaction, the energy of products is less than the energy of reactants.
Explanation:
Answer:
In an exothermic reeaction, the energy of products is less than the energy of reactants.
Explanation:
What is the volume, to the nearest whole cubic inch, of a cylinder with a height of 10 inches and a radius of 8 inches? Use Pi = 3.14 and round your answer to the whole number.
cubic inches
Answer:
v=2010 inches^3
Explanation:
The volume of a cylinder can be found using:
[tex]v=\pi r^2h[/tex]
We know the height is 10, the radius is 8, and we can substitute 3.14 in for pi
v=3.14(8^2)(10)
Solve the exponent first
v=3.14(64)(10)
v=3.14(640)
v=2009.6
To the nearest whole number:
v=2010 inches^3
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
Select all the correct images.
Select the atomic models that belong to the same element.
.
Answer:
There is no image
Explanation:
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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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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Increasing the mass of an object will... *
Answer:
Increasing the mass of an object will decrease the acceleration, because of Newton's Second Law (the acceleration of an object increases with increased force, decreases with increased mass, and moves the same direction as the force).
DNA damage can also occur in the form of broken bonds as in the sugar-phosphate backbone of DNA. This type of DNA damage can cause deletion mutations if pieces of DNA break away from the molecule. When those pieces rejoin a different molecule of DNA, what type of mutation has occurred?
A)Messenger Mutation
B)Mechanical Mutation
C)Translocation Mutation
D)Relocation Mutation
Answer:
A
Explanation:
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
What is [H30+] in a solution with a pH of 10.4?
Answer:
(H30+) = 3,98 x10 ^-11 M
Explanation:
The pH gives us an idea of the acidity or basicity of a solution. More precisely, it indicates the concentration of H30 + ions present in said solution. The pH scale ranges from 0 to 14: from 0 to 7 corresponds to acid solutions, 7 neutral solutions and between 7 and 14 basic solutions. It is calculated as:
pH = -log (H30 +)
We solve (H30+) and calculate:
(H30+) = antilog - pH
(H30+) = antilog - 10.4
(H30+) = 3,98 x10 ^-11 M
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
Consider the following three-step reaction pathway.
Step 1: (CH3)3AUPH3 → (CH3)3Au + PH3 (fast)
Step 2: (CH3)3Au → (CH3)Au + C2H6 (slow)
Step 3: (CH3)Au + PH3 – (CH3)AuPH3 (fast)
Which is the correct list of reaction intermediates from the reaction pathway above?
A.) (CH3)3AuPH3, (CH3)3Au, and (CH3)Au
B.) PH3 and (CH3)Au
C.) (CH3)3AUPH3 and C2H6
D.) PH3, (CH3)3Au, and (CH3)Au
Final answer:
The correct list of reaction intermediates is A)(CH3)3AuPH3, (CH3)3Au, and (CH3)Au.
Explanation:
The correct list of reaction intermediates from the given reaction pathway is:
A)(CH3)3AuPH3
,
(CH3)3Au
, and
(CH3)Au
This can be determined by examining the steps of the reaction pathway. In step 1, (CH3)3AUPH3 is converted into (CH3)3Au and PH3. In step 2, (CH3)3Au reacts to form (CH3)Au and C2H6. Finally, in step 3, (CH3)Au reacts with PH3 to form (CH3)AuPH3. Therefore, the intermediates are (CH3)3AuPH3, (CH3)3Au, and (CH3)Au.
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In the provided chemical reaction pathway, the intermediates are (CH3)3Au and (CH3)Au as they are produced in a step and consumed in a later step. This makes option D correct.
Explanation:In a chemical reaction, intermediates are substances that form during the reaction but are consumed before it's completed. Here, judging from the three-step reaction pathway you've been provided:
Step 1: (CH3)3AUPH3 → (CH3)3Au + PH3 (fast) Step 2: (CH3)3Au → (CH3)Au + C2H6 (slow) Step 3: (CH3)Au + PH3 → (CH3)AuPH3 (fast)
The intermediates can be identified as the molecules that are produced in one step and consumed in a later step. Based on this, the correct list of reaction intermediates from this reaction pathway is (CH3)3Au, because it is produced in step 1 and consumed in step 2 and (CH3)Au, because it is produced in step 2 and consumed in step 3. So, option D.) PH3, (CH3)3Au, and (CH3)Au 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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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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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.
While waiting for your car to warm up one winter morning, you notice a liquid dripping from your tailpipe. You recently
learned in chemistry class that combustion reactions occur in car engines. The liquid dripping from your tailpipe is, therefore,
a product of this combustion.
What is the identity of the liquid?
A)
Methanol
B)
Octane
Propane
Water
Answer:
A
Explanation:
Menthol (M 156.3 g/mol), the strong-smelling substance in many cough drops, is a compound of carbon, hydrogen, and oxygen. When 0.1595 g of menthol was bunted in a combustion apparatus. 0.449 g of CO_2 and 0.184 g of H_2 O formed.
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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Now molecules: molecules of H2 + molecules of O2 → molecules of H2O
Answer:
Now molecules:
(2) molecules of H 2 + (1) molecules of O 2 → (2) molecules of H 2 O
Explanation:
i just got the answer correct
The question involves a basic chemical reaction in Chemistry. Two molecules of hydrogen and one molecule of oxygen combine to form two molecules of water. It shows the process of a balanced chemical equation.
Explanation:The question provided involves a basic chemical reaction, in which hydrogen (H2) and oxygen (O2) molecules combine to create water (H2O). This process is an example of a balanced chemical reaction, in accordance with the law of conservation of matter that requires the total number of atoms for each element to remain the same before and after a reaction. Essentially, 2 molecules of hydrogen (H2) and 1 molecule of oxygen (O2) will combine to form 2 molecules of water (H2O)
This can be represented as: 2H2 + O2 → 2H2O. This means, two hydrogen molecules (each containing 2 hydrogen atoms) react with one molecule of oxygen (containing 2 oxygen atoms) to form two molecules of water (each containing 2 hydrogen atoms and 1 oxygen atom).
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how many grams of calcium fluoride contain 38 grams of fluoride atoms
What size volumetric flask would you use to create 1.50 M
solution using 43.85 g of NaCl?
The size of volumetric flask is 0.5L = 500mL
Explanation:
In order to estimate the concentration of a solution in molarity, then the total number of moles of the solute is divided by the total volume of the solution.
Molarity of a solution is given by;
[tex]M= \frac{n}{V}[/tex]
Where;
n= number of moles of solute
V= volume of solution = size of volumetric flask
[tex]n=\frac{m }{ m.m}[/tex]
Where;
m= mass of solute=43.85g
m.m= molar mass of solute=58.5g
Note that solute is NaCl(s)
[tex]n=\frac{43.85}{58.5}=0.75mol[/tex]
We know that the molarity is 1.50M
To find the size of the volumetric flask, we make V in M=n/V subject of formula
[tex]V=\frac{n}{M}[/tex]
[tex]V=\frac{0.75}{1.50}[/tex]
[tex]V=0.5[/tex]
Therefore, the size of volumetric flask is 0.5L = 500mL.
Final answer:
To prepare a 1.50 M NaCl solution using 43.85 g of NaCl, calculate the moles of NaCl and then divide by the desired molarity, resulting in a volume of 0.500 liters. Therefore, a 500 mL volumetric flask should be used.
Explanation:
To determine what size volumetric flask is needed to create a 1.50 M solution using 43.85 g of NaCl, we first need to calculate the amount of solvent required to achieve this molarity. The molar mass of sodium chloride (NaCl) is approximately 58.44 g/mol. To find the number of moles in 43.85 g of NaCl, we divide the mass by the molar mass:
moles of NaCl = 43.85 g / 58.44 g/mol = 0.750 moles
Next, we use the formula for molarity (M), which is moles of solute (n) divided by liters of solution (V). Since we want a 1.50 M solution:
1.50 M = 0.750 moles / V (liters)
Solving for V gives us:
V = 0.750 moles / 1.50 M = 0.500 liters
Thus, a 500 mL volumetric flask is appropriate to prepare this solution, ensuring the final volume accounts for the added volume after the solute has dissolved.
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.
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
A magnet moved near a coil of wire can cause a(n)
to flow.
A. electric current
B.protons
c. magnetic field
D.neutrons
Answer:
A magnet moved near a coil of wire can cause a(n) electric current to flow. (The magnet's magnetic field also moves.)
Explanation:
The answer is A.
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
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.
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.
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
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.
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