Answer:
The correct answer is : Alfred Wegener
Explanation:
I know this is super late > but i hope this helps!
give an example of competition in an ecosystem
hbzjaj
Explanation:
competition for food
What is the volume in liters of 3.80 moles of CO2gas at STP?
Answer:
V = 85.2
Explanation:
STP = 273K and 1 atm
Considering what we know about STP, we get the moles, temperature, and pressure. Using the ideal gas law we can find the volume (PV = nRT). Plug in our variables: (1 * V = 3.80 * R * 273). Since we are dealing with atm and not kPA or mmHg, we use the constant for atm (0.0821) which we use for R. (So.. now our equation is 1 * V = 3.80 * 0.0821 * 273). We now multiply the right side to get 85.17054. So... V = 85.2 considering sigificant figures (this is the part where I am the least sure of, since I havent done sig figs in a while)
how do you balance sulfur + fluoride = sulfur hexafluoride?
S + F2 >>> SF6
Step 7: Measure Pressure and Volume with the Book
and 2 kg of Weight
Total the mass on the syringe. Record it in the
correct row of the data table.
kg
Answer:
1) 2.498
2) 1.27
3) A) 40.5
4) 51.4
Explanation:
Answer: 2.498
Explanation:
I’m taking it rn and got it wrong so y’all could get it right
HELPPPP!!!!
Four students were asked to identify the part of an atom that determines the atom's identity and chemical properties. The student's responses are shown in the chart below. Which of the student's responses is correct?
Answer:
The number of protons is what determines a atoms identity.
This means that student 3 is correct.
Explanation:
Is this balanced ?CsH12 + 702 → 5 CO2 + 6H2O
Answer:
Nope
Explanation:
Answer: nope, it should be : C5H12 + 8O2 → 5CO2 + 6H2O
A balanced chemical equation takes into account the theory that:
a. Compounds and elements remain unchanged in a chemical reaction
b. Atoms are neither created nor destroyed in a chemical reaction
c. The total mass always increases during a chemical reaction
d. The mass of any gases involved can be ignored.
Which is correct?
Answer:
b. Atoms are neither created nor destroyed in a chemical reaction
Explanation:
B is correct, because the law of conservation of mass tells us that during a chemical reaction, there is no net gain or loss of mass. Mass comes from the atoms themselves that are participating in the reaction, so there is no gain or loss (creation or destruction) of atoms.
Which of the following would have three iron atoms in its formula? Iron oxide, iron Ill oxideiron phosphide, or iron phosphide.
Answer:
1 and 4 and 24
Explanation:
I know this because i passed 1st grade
how do you make fried chicken im white and don't know how to season
Answer:
lol you use batter use flour salt pepper thats what gives it the fried and crispy taste
Explanation:
Judge Joe is looking over a list of expert witnesses that must be summoned to court. Which one of the following actions would he take pretrial to ensure they appear? A. Issue an arrest warrant. B. Conduct a jury poll. C. Send out subpoenas. D. Interpret case law.
Help please you don’t need to show work
Answer:
24.07
Explanation:
4 Al + 3 O₂ --> 2 Al2Ol₃ Given 6 moles of aluminum, how many grams of aluminum oxide will be produced?
Answer:
305.88 g
Explanation:
4 Al + 3 O₂ → 2 Al₂O₃
First, we convert 6 moles of aluminum (Al) into moles of aluminum oxide (Al₂O₃), using the stoichiometric coefficients:
6 mol Al * [tex]\frac{2molAl_2O_3}{4molAl}[/tex] = 3 mol Al₂O₃
Finally we convert 3 moles of aluminum oxide into grams, using its molar mass:
3 mol Al₂O₃ * 101.96 g/mol = 305.88 g
AA this is rlly important, i will give brainliest but could someone please explain the photosynthesis process pretty much in their own words?? i kind of need this and yes it is 3 am, at least a paragraph please, and strongly preferred scientific words.
Answer:
Please find the explanation of photosynthesis below
Explanation:
Photosynthesis is a metabolic process that occurs in the chloroplast of plants and algae. It involves the synthesis of food in form of glucose in the presence of sunlight. Photosynthesis occurs in two major stages namely: light dependent stage and light independent stage.
The overall chemical equation are as follows:
6CO2 + 6H2O → C6H12O6 + 6O2
- Light dependent stage occurs in the thylakoid lumen of the chloroplast. In this stage, ATP and NADPH, which are energy carrier and electron acceptor respectively, are produced. They are then used in the light independent stage. This reaction strictly occurs only in the presence of sunlight.
- The light independent stage is also called Calvin cycle. The ATP and NADPH produced from earlier are used to synthesize glucose (C6H12O6) and oxygen (waste product) by combining CO2 and water (H2O).
the equation of 3times x is 38
Answer is 38/3 or 12.67
3x=38
x=38/3
therefore answer is the one mentioned above
please help!! will give brainliest if u tell me how
Why does heat transfer from object to object?
Select one:
a.Heat transfers because of the temperature differences between objects
b.Heat transfers because of the mass difference between objects
c.Heat does not transfer between objects
d.Heat is energy so it moves
A closed gas system initially has pressure and volume of 0.922 atm and 4.64L with the temperature unknown. If the same closed system has values of 1030 torr, 4.36 L, and 837K, what was the initial temperature in K?
Answer:
606.09K
Explanation:
Using the combined gas law equation;
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the provided information in the question;
P1 = 0.922atm
P2 = 1030torr = 1.355atm
V1 = 4.64L
V2 = 4.36L
T1 = ?
T2 = 837K
Using P1V1/T1 = P2V2/T2
0.922 × 4.64/T1 = 1.355 × 4.36/837
4.278/T1 = 5.9078/837
Cross multiply
5.9078T1 = 837 × 4.278
5.9078T1 = 3580.69
T1 = 3580.69/5.9078
T1 = 606.09K
In a warehouse, the workers sometimes slide boxes along the floor to move them. Two boxes were sliding toward each other and crashed. The crash caused both boxes to change speed. Based on the information in the diagram, which statement is correct? In your answer, explain what the forces were like and why the boxes changed speed.
Box 1 has more mass than Box 2.
Box 1 and Box 2 are the same mass.
Box 1 has less mass than Box 2.
Answer:
Box 1 and Box 2 are the same mass.
Explanation:
Because they both change speed due to having the same mass!
Hope this helps! :) BRAINLIEST PLZ
Is the fractional distillation of liquefied air a physical or chemical change?
Answer:
Physical Chanhe is the answer : )
Select all of the answers that apply.
multiple selection answer
Surface currents are driven by _____.
salinity
density
wind
temperature
the moon
[tex]\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the Geography.
Surface currents in a ocean or a sea are driven by Winds.
Answer:
winds :)
Explanation:
2 NH3(g) → N2(g) + 3 H2(g)
What type of reaction is shown above?
A)
single replacement
B)
decomposition
C)
double replacement
D)
synthesis
Answer:
Decomposition Reaction
Explanation:
In the provided reaction, we can see that Ammonia is getting decomposed into Nitrogen and Hydrogen gas.
Another way to think about it is that Decomposition is nothing but one thing giving rise to 2 or more than 2 things.
Since our Ammonia is giving rise to 2 gases, this reaction is an example of Decomposition reaction
A student has a salt water solution. When the student adds more salt to the solution it completely dissolves. What type of solution did the student start with?
unsaturated
saturated
supersaturated
Answer:
SaturatedExplanation:
Asaturated solution is a solution that contains the maximum amount of solute that is capable of being dissolved. Table salt (NaCl) readily dissolves in water.
Why might the seismic waves have traveled faster to one city than the other? A. They were traveling through different types of rocks. B. One city was quieter that the other. C. It is impossible for waves to travel at different speeds. D. One city was smaller than the other.
Answer: A. They were traveling through different types of rocks
Explanation:
A swimmer is moving at a speed of 2.0 meters/second. How long will it take for the swimmer to go 100 meters?
which image of earth is more recent?
Answer:
b
Explanation:
Answer:
2
Explanation:
its has more space now cause of The to contemplates
how do i make chrystals
Answer:
1. In the beaker, stir 1/2 cup of Epsom salts with 1/2 cup of very hot tap water for at least one minute. ...
2. Add a couple drops of food coloring if you want your crystals to be colored.
3. Put the beaker in the refrigerator.
4. Check on it in a few hours to see a beaker full of epsom salt crystals!
Explanation:
please help! Question is on the bottom
Help please
what is the half-life of c-14 at 250g?
Answer:
5,730 years
hope im right
Explanation:
Its half-life is 5,730 years. How much of a 250g sample of carbon-14 will be left in 5,000 years?
What is the approximate elevation above sea level at which atmospheric pressure is 10-1 atmosphere
Answer:
The answer is 17km
We need a 3.0M aqueous HCl solution to dissolve the middle of a penny which is made of nickel. What mass of HCl is contained in 2.40 L of a 3.0M solution?
Answer:
262.8 g
Explanation:
Molarity = 3.0M
Mass = ?
Volume = 2.40L
The relationship between these quantities is given as;
Molarity = Number of moles / Volume
Number of moles = Molarity * Volume
Number of moles = 3 * 2.4 = 7.2 mol
Mass = Number of moles * Molar mass
Molar mass of HCl = 1 + 35.5 = 36.5 g/mol
Mass = 7.2 * 36.5 = 262.8 g
Answer:
262.44 grams of HCl is contained in 2.40 L of a 3.0 M solution.
Explanation:
Molarity (M) or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.
Molarity is calculated as the number of moles divided by the volume of the solution:
[tex]Molarity=\frac{number of moles of solute}{volume of solution}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
In this case:
Molarity= 3 MNumber of moles of solute= ?Volume of solution= 2.4 LReplacing:
[tex]3 M=\frac{number of moles of solute}{2.40 L}[/tex]
and solving you get:
number of moles of solute= 3 M* 2.40 L
number of moles of solute= 7.2 moles
Being the molar mass of HCl 36.45 g/mole, then you can apply the following rule of three: if 1 mole has 36.45 grams, 7.2 moles how much mass does it have?
[tex]mass of HCl=\frac{7.2 moles*36.45 grams}{1 mole}[/tex]
mass of HCl= 262.44 grams
262.44 grams of HCl is contained in 2.40 L of a 3.0 M solution.
What is the pH of a buffer solution prepared by mixing 20.0 mL of 0.0800 molL−1NaOH with 20.0 mL of 0.130 molL−1 cacodylic acid?
Answer:
pH = 6.20
Explanation:
The pKa of cacodylic acid is 6.
To solve this question we must use Henderson-Hasselbalch equation:
pH = pKa +log [A⁻] / [HA]
Where pKa is the pKa of the weak acid = 6
And [] could be taken as the moles of A⁻ the conjugate base, and HA, the weak acid.
The moles of the NaOH added to the solution of the weak acid are = Moles A⁻
And moles HA = Initial moles HA - Moles NaOH added
Initial moles HA:
0.0200L * (0.130mol / L) = 0.00260 moles
Moles NaOH:
0.0200L * (0.0800mol / L) = 0.00160 moles = [A⁻]
Moles HA =
0.00260 moles - 0.00160 moles = 0.00100 moles = [HA]
pH = 6 +log [0.00160 moles] / [0.00100 moles]
pH = 6.20The pH of the resulting solution is 1.6.
Let cacodylic acid be HA, mixing cacodylic acid and NaOH, the following occurs;
HA(aq) + NaOH(aq) ------> NaA(aq) + H2O(l)
Number of moles of NaOH = 0.0800 molL−1 × 20.0/1000 = 0.0016 moles
Number of moles of HA = 20.0/1000 × 0.130 = 0.0026 moles
We can see that the HA is in excess, Number of moles of excess acid =
0.0026 - 0.0016 = 0.001 moles
Total volume of solution = 20.0 mL + 20.0 mL = 40 mL or 0.004 L
Molarity of excess acid = 0.001 moles/0.004 L = 0.025 M
pH = -log[H^+]
pH = -log[0.025 M]
pH = 1.6
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