Answer:
Without angiosperms, average annual rainfall in the area declined by 300 millimeters. In the eastern Amazon basin, the length of the wet season decreased by nearly 3 months. The extent of the wettest rainforests, which receive more than 100 millimeters of rain per month, shrank by 80%.
When fossil fuels are burned, they release pollutants into the air. When hydrogen is burned, it produces clean water. There are limited amounts of fossil fuels that can be uncovered by digging in the Earth. Hydrogen must be produced from other materials, such as water, which requires using energy.
In order to determine whether replacing fossil fuels with hydrogen would be good for the environment, what question must be answered?
Answer: can hydrogen produce as much energy as burning fossil fuels?
Explanation:
A student observes the phenomenon where a straw has a different appearance when placed in water. Once this was noted by the student, they then immediately thought about why they have been unable to successfully catch fish when spearing them in the water. Relate these two phenomenon and select ALL statements that apply to the phenomena described here.
A)The water distorts the image of the fish so that its image is inverted.
B)The student is not aiming correctly due to refraction of the fish in the water.
C)The water magnifies the image, making the target fish look bigger than it actually is.
D)The light waves travel at a different speed in water and make the fish appear farther away.
E)The diffraction of the light around objects flips the image from left to right, making aiming for fish more of a challenge.
Answers are B and D
Answer:
b, and d
Explanation:
if the student did not aim correctly, and for d if the light waves travelled differently
Which of the following distinguishing electron configurations is characteristi
of noble gases?
O nf14
Ond10
O npo
Ons2
Answer:
no.3 is your correct answer
whats ur favorite type of subject in school
Answer:
MAthhh
Explanation:
Give me a brainly
Answer:
My favorite subject in school is P.E or Language arts
Explanation:
You are conducting an experiment with two very reactive substances. One will react with oxygen (O) and other substances in the air, and the other will react to metal in a container. What type of environment can you seal them in so they only react with each other?
A. Seal them in a glass container in an atmosphere of argon (Ar) gas.
B. Suspend them in a bromine (Br) solution inside a glass container.
C. Seal them in a container of soft alkali metal such as lithium (Li), in an atmosphere of hydrogen (H) gas.
D. Seal them in a container made of alkali earth metal, such as calcium (Ca).
Answer:
A. Seal them in a glass container in an atmosphere of argon (Ar) gas.
Because Argon is an inert/noble gas which do not react with other elements/radicals. Thus, best way to make two radicals/substance only react is to seal them in glass container consisting atmosphere of Argon (Ar)..
Note: I also dont know if it's correct answer.. Since I am just giving my logic.. I hope it will help you
- Regards Rishab...
Answer: C. Seal them in a glass container in an atmosphere of argon (Ar) gas.
Explanation: Founders Educere answer ;)
A graphic designer has the choice to download design software on her computer and then design a logo or to use an online
version of the software to design the logo. Identify one advantage and one disadvantage of using the online software to design
the logo 2 points)
An online version is the availability of the application on the web and the internet. The online version of the logo designer is advantageous as it provides more customization choices.
What is logo designing?A logo design is a method to create logos that represent the brand of the business corporation or any other organization, it represents the company and brand.
Online software for logo designing provides more choices for customization as more fonts, styles, graphics, colors, and effects are present in online software.
The use of online software can be disadvantageous as it can be copied. The same tool and online data can be used to create the same logo and can be harmful to the company.
Therefore, using online software for logo designing can be both advantageous and disadvantageous.
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Answer:
Explanation:first one
Oleic acid, a component of olive oil, is 76.54% C, 12.13% H, and 11.33% 0. The
experimental value of the molar mass is 282 g/mol.
a. What is the molecular formula of oleic acid?
b. If oleic acid has a density of 0.895 g/mL, how many molecules of oleic acid
are in 3.00 mL of oleic acid?
Answer:
a) The molecular formula of oleic acid is: [tex]C_{18}H_{34}O_{2}[/tex]
b) There are 5.74 x 10^21 molecules of oleic acid in a 3.00 mL sample.
Explanation:
a)
First, let's determine the empirical formula of oleic acid from the percentage composition provided by the question:
- Assuming a 100g sample of oleic acid, the correspondent mass of C, H and O would be:
mass of C = 76.54g
mass of H = 12.13g
mass of O = 11.33g
- We must determine the number of moles contained in each of the masses determined above. For that, let's use the atomic masses of C (12.01 u), H (1.007 u) and O (15.99 u) and the following equation:
[tex]number of moles = \frac{mass of sample}{molar mass}[/tex]
number of moles of C = 76.54g / 12.01 g/mol = 6.373 mol C
number of moles of H = 12.13g / 1.007 g/mol = 12.04 mol H
number of moles of O = 11.33g / 15.99 g/mol = 0.7086 mol O
- Next, we'll try to find whole-number ratios by dividing each number of moles obtained by the smallest value obtained (0.7086):
C = 6.373 / 0.7086 = 8.994 ≅ 9
H = 12.04 / 0.7086 = 16.99 ≅ 17
O = 0.7086 / 0.7086 = 1.000
- Now, we can write the empirical formula of oleic acid as: [tex]C_{9}H_{17}O[/tex]
Now that we have the empirical formula for oleic acid (C9H17O), let's check its molar mass and compare it to the experimental value provided by the question (282 g/mol):
molar mass (C9H17O) = 9 * 12.01 + 17 * 1.007 + 1 * 15.99 = 141.9 g/mol
Note that the molar mass obtained from the empirical formula (141.9 g/mol) and the experimental molar mass (282 g/mol) are different, thus we need to find an integer multiple to determine the molecular formula (keep in mind that molecular formulas always present kind and number of atoms of each element present in the molecular compound, while the empirical formula presents the smallest coefficients for each atom).
Molecular formula = n × Empirical formula
This integer multiple, n, can be obtained by dividing the molar mass, MM , of the compound by the empirical formula mass, EFM (the molar mass represented by the empirical formula):
n = MM / EFM
n = 282 / 141.9
n = 1.987 ≅ 2
Since the integer multiple is 2, we can multiply all coefficients in the empirical formula by 2 to find the molecular formula of oleic acid:
C9 H17 O x 2 = C18 H34 O2
Therefore, the molecular formula of oleic acid is: [tex]C_{18}H_{34}O_{2}[/tex]
b)
We need to calculate the amount of molecules of oleic acid in a 3.00mL sample, considering the density as 0.895 g/mL.
From the density provided, we can calculate the mass, in grams, of oleic acid contained in 3.00 mL of this compound:
1 mL ----------------------- 0.895 g oleic acid
3.00 mL ----------------- x
Solving for x, we have that there are 2.69 g of oleic acid in a 3.00 mL sample.
Next, considering the molar mass of oleic acid (282 g/mol), we can calculate the number of moles contained in 2.685g of the acid:
282 g -------------------- 1 mol oleic acid
2.69 g ----------------- y
Solving for y, we have that there are 0.00953 moles of oleic acid in a 3.00 mL sample.
Now, using the Avogadro's number (6.022 x 10^23 particles/mol), we can calculate the amount of molecules of oleic acid in the sample:
1 mol oleic acid ------------------------------- 6.022 x 10^23 molecules oleic acid
0.00953 mol oleic acid ------------------- z
Solving for z, we have that there are 5.74 x 10^21 molecules of oleic acid in a 3.00 mL sample.
How many molecules are there in a 42.3g sample of water
Answer:
This means that one mole of water molecules has a mass of 18.015g.
42.3g * 1 mole H2O/18.015g
= 2.3480 moles H2O
We are using the avogadros number to find the number of molecules of water
2.3480 H2O * 6.022*10^ 23moles/ 1mole of H2O
That's 2.3480 multiplied by 6.022*10^23 divided by 1 mole of H2O
Number of molecules = 1.4140 *10^24 molecules
plss help me with this I don't even know where to start to solve it
From the balanced equation of the reaction, the coefficients of the reactants and products are 1:2:1.
What is a balanced equation of a chemical reaction?A balanced equation of a chemical reaction is an equation which balances the atoms of each element on the reactants as well as the products side of a chemical reaction.
The balanced equation of the reaction that occurs when magnesium bromide is heated is shown below:
[tex]MgBr_2 \rightarrow Br_2+Mg [/tex]
Therefore, the coefficients of the reactants and products are 1:2:1.
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Wildfires displace many animals and leave behind ash and soot-covered habitats for the animals that
survive. If a wildfire
occurred in the Everglades, which insect would be the
most likely to survive
predators in an ash and soot-covered habitat? (SC.5.L. 15.1)
A. Red dragonfly
B. Green grasshopper
C. Brightly colored butterfly
D. Gray-colored speckled moth
7. A group of students is using models to explore the relationship between the shape of a bird's beak
the type of food it eats. The students design an investigation using classroom items as beaks. Each
If a wildfire occurred in the Everglades, the insect which most likely to survive predator is gray-colored speckled moth.
What are predators?Predators are those animals which for their survival will hunt or kill another animals for the fulfilment of their food need.
If wildfire occured in the everglades region then the insect would be the most likely to survive predators in an ash and soot covered habitat is gray-colored speckled moth which is also known as darwin moth as it takes part in evolution of natural process.
Hnece the required animal is gray-colored speckled moth.
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okay this is the only way to get my answers
Answer:
Your answer is Answer thank me later :) <3
Explanation:
Calculate the molarity of a solution prepared by diluting 7.0 mL of 4.0 M solution to a volume of 30 mL. Select the correct answer below: 0.76 M 0.87 M 0.93 M 1.02 M
Answer:
0.93 M
Explanation:
Molarity = [tex]\frac{Moles}{Volume}[/tex]
4.0M = [tex]\frac{x}{0.007 L}[/tex]
4.0 M x 0.007 L = Moles = 0.028
Molarity = [tex]\frac{Moles}{Volume}[/tex]
Molarity = [tex]\frac{0.028 moles}{0.03 L}[/tex]
= 0.93 M
Florida and the eastern border of South Carolina share a regional landform characterized by flat land and low elevation. Identify the landform shared by both states.
Karst
Keys
Coastline
Plateau
Answer: it is coastline.
Explanation: This anwser would only makw sense because of the low elevation and the flat land.
The landform shared by Florida and the eastern border of South Carolina is the coastline. Option C is the correct answer.
Both states are located along the Atlantic Ocean and have a similar geographical feature characterized by flat land and low elevation along their eastern borders. Option C is the correct answer.
The coastline refers to the area where the land meets the sea. It is typically marked by sandy beaches, coastal marshes, and barrier islands. In the case of Florida and the eastern border of South Carolina, this coastline is known for its relatively flat terrain and low elevation, which makes it susceptible to flooding and storm surge during hurricanes. The coastline plays a significant role in the economies and ecosystems of both states. It attracts tourism and provides opportunities for recreational activities such as beachgoing, fishing, and boating. It is also a vital habitat for various marine and coastal species, including birds, turtles, and marine mammals.
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The complete question is, "Florida and the eastern border of South Carolina share a regional landform characterized by flat land and low elevation. Identify the landform shared by both states.
a. Karst
b. Keys
c. Coastline
d. Plateau"
name this please, please pleas
Answer:
propyne
Explanation:
100 points! Please help if you are able to.
Here are the balanced equations
C_2H_5OH+3O_2--->2CO_2+3H_2O+Energy2AgCl-->2Ag+Cl_2AgNO_3+Zn--->Ag+ZnNO_33BaCl_2+Al_2(SO_4)_3--->3BaSO_4+2AlCl_3H_2+I_2--->2HIDone!
Ethanoic acid has a pKa of 4.75. Find the pH of the solutions that results from the addition of 40.0 mL of 0.040 M NaOH to 50.0 mL of 0.075 M ethanoic acid.
Answer:
About 4.63.
Explanation:
The reaction between ethanoic acid (CH₃COOH) and sodium hydroxide (NaOH) can be described by the following net ionic equation:
[tex]\displaystyle \text{CH$_3$COOH}_\text{(aq)} + \text{OH}^-_\text{(aq)}\longrightarrow \text{CH$_3$COO}^-_\text{(aq)} + \text{H$_2$O}_\text{($\ell$)}[/tex]
40.0 mL of 0.040 M NaOH contains:
[tex]\displaystyle 40.0\text{ mL} \cdot \frac{0.040\text{ mol NaOH}}{1000\text{ mL}} = 0.0016\text{ mol NaOH}[/tex]
Because NaOH is a strong base, it dissociates completely. Hence, the amount of OH⁻ present is 0.0016 mol. Na⁺ acts as a spectator ion.
50.0 mL of 0.075 M CH₃COOH contains:
[tex]\displaystyle 50.0\text{ mL} \cdot \frac{0.075\text{ mol CH$_3$COOH}}{1000\text{ mL}} = 0.0038\text{ mol CH$_3$COOH}[/tex]
OH⁻ is the limiting reagent of the reaction. Therefore, as the reaction proceeds to completion:
The amount of OH⁻ drops to 0 mol. The amount of CH₃COOH decreases to (0.0038 - 0.0016) mol = 0.0022 mol. And the amount of CH₃COO⁻ increases to (0 + 0.0016) mol = 0.0016 mol.Note that all species present are in a one-to-one ratio.
To find pH, we can use the Henderson-Hasselbalch equation:
[tex]\displaystyle \text{pH} = \text{p}K_a + \log\frac{[\text{Base}]}{[\text{Acid}]}[/tex]
The total volume of the solution is 40.0 mL + 50.0 mL = 90.0 mL.
Hence, find [CH₃COOH]:
[tex]\displaystyle \left[\text{CH$_3$COOH}\right] = \frac{0.0022\text{ mol}}{90.0\text{ mL}} \cdot \frac{1000\text{ mL}}{1\text{ L}} = 0.024\text{ L}[/tex]
Find [CH₃COO⁻]:
[tex]\displaystyle \left[\text{CH$_3$COO}^-\right] = \frac{0.0016\text{ mol}}{90.0\text{ mL}}\cdot \frac{1000\text{ mL}}{1\text{ L}} = 0.018\text{ M}[/tex]
Therefore, the pH of the resulting solution is:
[tex]\displaystyle \begin{aligned}\text{pH} & = \text{p}K_a + \log\frac{[\text{Base}]}{[\text{Acid}]} \\ \\ & = (4.75) + \log \frac{(0.018)}{(0.024)} \\ \\ & = 4.75 + (-0.12) \\ \\ & = 4.63\end{aligned}[/tex]
In conclusion, the pH of the resulting solution is about 4.63.
During complete metamorphosis, what best describes the transformation from a larva to a pupa?
The larva goes through a big change in color.
The larva might form a cocoon or a chrysalis.
The larva might hatch into an adult.
The larva sheds its skin several times.
Answer:The larva might form a cocoon or a chrysalis.
Explanation:
Which of the following conversions is/are incorrect.
a.1 meter = 1000 millimeters
b.100 millimeters = 1 centimeter
c.500 centimeters = 0.5 meters
d. 1 kilometer = 1000 meters
C+A
B+ C
D+ C
A+B
Answer:
B + C ARE INCORRECT FROM THE ABOVE GIVEN CONVERSIONS.
Why is sodium chloride not considered a molecular compound? What kind of compound is it?
Answer:
Something like table salt (NaCl) is a compound because it is made from more than one kind of element (sodium and chlorine), but it is not a molecule because the bond that holds NaCl together is an ionic bond. If you like, you can say that sodium chloride is an ionic compound.
Explanation:
copper ii oxide and charcoal are black solids how would you distinguish between the two solid
Answer:Charcoal will burn. You may also be able to distinguish it by smell, since it's rarely purged of all its “burnt wood” residue. Copper oxide will dissolve in a strong acid, such as hydrochloric or sulphuric and form a blue solution
Explanation:
How does a specific theory compare to a scientific law
Do you mean scientific theory? If so, then scientific theories and laws are principles which can be used to better understand the world and space around us.
pls pls help me with this
Answer:
1. lava
2. caldera
3. true
4. true
5. before
Which element has the highest 2nd ionization energy?
A. Be
B. C
C. Li
D. B
Answer:
The answer is c.........
If 25.0 mL of a 2.00 M HCl solution is diluted to 2.00 L, what is the molarity of the new solution?
The molarity of a new solution that has a volume of 25.0 mL of a 2.00 M HCl solution and diluted to 2.00 L is 0.025M.
How to calculate molarity of a solution?The molarity of a solution can be calculated using the following formula:
C1V1 = C2V2
Where;
C1 = initial concentrationC2 = final concentrationV1 = initial volumeV2 = final volume2 × 25 = 2000 × C2
50 = 2000C2
C2 = 50 ÷ 2000
C2 = 0.025M
Therefore, the molarity of a new solution that has a volume of 25.0 mL of a 2.00 M HCl solution and diluted to 2.00 L is 0.025M.
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Where does runoff end up?
a)ponds
b)streams
c)rivers
d)all of the above
Answer:
All of the above :D
Explanation:
When rain falls, if it doesn't get absorbed by the dirt, it will go into streams, rivers, and ponds. That is actually how flooding is caused!!! :D
Have an amazing day!!
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what is the size of an atom when it generally decreases
Answer:
the size depends on where is moves across the periodic table.
Calculate the Kelvin and Fahrenheit temperature equivalent to 37° Celsius.
Answer:
310.15 Kelvin. 98.6 Farenheit
Explanation:
To calcuate the celsius to Kelvin you add 273.15 to the celsius. To calculate the celsius to farenheit you do (°C × 9/5) + 32 = °F. For the example, (37°C × 9/5) + 32 = 98.6°F.
according to newtons second law of motion,what is force equal to?
Answer:
This isn't chemistry but the answer is Force = mass x acceleration
Which of the following best describes the process of carbon dioxide
sequestration?
O A. Technologies reduce the amount of carbon dioxide consumed by
forests.
O B. Technologies capture carbon dioxide and inject it into rock
formations,
O C. Technologies reduce the amount of carbon dioxide produced by
factories.
O D. Technologies capture carbon dioxide and release it into the
atmosphere
Answer:
C. Technologies reduce the amount of carbon dioxide produced by
factories.
Explanation:
simply the answer is C. trust me, im very smart
what is daily product ? Any ten point
Answer:
the interest applied on the end of day balance.
Explanation: