Answer: 6158.46
Explanation:
1 mole of helium gas contains 6.02 x1023 helium atoms. 1 mole of water contains 6.02 x1023 water molecules.
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
Help please you don’t need to show work
Answer:
24.07
Explanation:
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
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).
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:
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
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
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)
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?
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:
the reaction 2F2+ 2H2O + 4HF + 02 find the number of moles of oxygen produced from 10 moles of fluorine
Answer:
20 moles of Oxygen
Explanation:
2F2 + 2H20 -> 4HF + O2
We have 10 moles of fluorine. Based on the reaction equation, we see that:
n O2 = 2 * n F2 (n is the number of moles)
=> n O2 = 2 * 10 = 20 (moles)
Because of this, the number of moles of oxygen is 20 moles.
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.
A student wants to carry out flame tests on these three chemicals. Describe how to carry out a flame test.
Answer:
Flame test is one of the chemical tests that can be used to identify a metal or metaloid
in an ionic compound.
Explanation:
Flame test is guided by a principle that when an unknown metal is heated, heat of the flame converts the metal ions into atoms which become excited and emit visible light.
To carry out flame test in a laboratory the following instruments are required:
--> a wire loop
--> Bunsen burner
--> the chemical compound under observation
--> protective wears.
The procedure involves the following steps:
--> turn on the Bunsen burner and adjust the barrel of the burner roll the flame is blue.
--> using a clean wire loop deep into a beaker containing hydrochloric acid.
--> to ensure that the loop is clean, it will give the same blue colour of the flame when heated.
--> deep the loop in the acid again and then use it to pick few grains of the metal.
--> place the wire loop in the side of the flame and observe the colour of the flame.
Result of flame tests of some metallic ion will show the following:
--> sodium ion will give yellow colour flame
--> potassium ion will give lilac colour flame
--> calcium ion will give orange-red colour flame
Cars require multiple energy transformations. Gasoline is put in the tank to burn for the car to go. The car battery provides the energy for other functions of the car as well.
Which of the following type of energy is NOT used in a car?
A.Chemical Energy
B.Electrical Energy
C.Kinetic Energy
D.Sound Energy
PS: I Need This Right Now, Please Help You Will Get 10 Points For Answering The Question. Give TRUE HONEST Opinion That YOU Think Is Right. This Is Due Today ( Friday March 5th 2021 ) America’s Date.
The energy is found to has a specific physical meaning. There are different forms of energy on earth. The ability to do the work is defined as the energy. Here chemical energy is not used by the car. The correct option is A.
What is Kinetic energy?The measure of the work an object can do by virtue of its motion is defined as the kinetic energy. To accelerate an object, it is very important to have the kinetic energy. Activities like walking, jumping, and falling involve kinetic energy.
The energy which is stored in the molecules and atoms and is converted to other forms of energy is defined as the chemical energy. The fuel and air are chemical energy which is transformed to mechanical for a race car. Here kinetic energy inside the engine is transformed from chemical energy to mechanical energy.
So electrical energy, kinetic energy and sound energy are used by cars.
Thus the correct option is A.
To know more about Chemical Energy, visit;
https://brainly.com/question/30288262
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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
For the reaction N2+3H2⇌2NH3, the metals Fe and Mo used as catalyst. which of the following is NOT a reason that catalysts have no effect on the equilibrium state?
A. In the presence of a catalyst, the same amounts of reactants and products will be formed as would form in the uncatalyzed reaction.
B. The addition of a catalyst speeds the rate of both the forward and reverse reactions, resulting in no change to the equilibrium.
C. Catalysts reduce the required activation energy and allow a reaction to reach equilibrium more quickly.
D. Catalysts get used up in the formation of the product.
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.
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.
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
how do you balance sulfur + fluoride = sulfur hexafluoride?
S + F2 >>> SF6
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:
Is this balanced ?CsH12 + 702 → 5 CO2 + 6H2O
Answer:
Nope
Explanation:
Answer: nope, it should be : C5H12 + 8O2 → 5CO2 + 6H2O
Is the fractional distillation of liquefied air a physical or chemical change?
Answer:
Physical Chanhe is the answer : )
What is the approximate elevation above sea level at which atmospheric pressure is 10-1 atmosphere
Answer:
The answer is 17km
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
please help! Question is on the bottom
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:
which image of earth is more recent?
Answer:
b
Explanation:
Answer:
2
Explanation:
its has more space now cause of The to contemplates
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
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: