Answer:
The mass of one mole of a substance is equal to that substance's molecular weight. ... water is 18.015 atomic mass units (amu), so one mole of water weight 18.015 grams. ... Avogadro's number is a proportion that relates molar mass on an atomic ... one molecule of water (H2O), one mole of oxygen (6.022×1023 of O atoms)
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:
Calculate the molarity of a solution containing 21.9g of MgCl, in enough water to
make a 750.mL solution.
The calorimeter pictured below shows the final temperature after calcium chloride was added to water. (The initial temperature was 25°C.) Which of the following best describes what occurred within the calorimeter?
A. Only Bond forming occurred
B. The bonds that formed were the most part stronger than the bonds that were broken
C. More energy was absorbed in breaking bonds than was released when new bonds form
D. As the powder dissolved, the breaking of bonds released energy
Answer:
The answer is acctualy B
Explanation:
I did the gizmo
The calorimeter has the final temperature rise with the addition of calcium chloride as formation of bonds stronger than the bonds that are broken. Thus option B is correct.
There has been increased in the temperature as the breaking of bonds has released energy in the solution. With the high energy in the solution, the part of the energy has been used for the bond formation. However the rise results as the bonds formed are stronger than the bonds broken.
The calorimeter has the final temperature of [tex]\rm 52^\circ C[/tex]. The addition of calcium chloride results in a rise in temperature. This has resulted in the formation of bonds stronger than the bonds that are broken. Thus option B is correct.
For more information about the calorimeter, refer to the link:
https://brainly.com/question/10987564
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:
Calculate the change in heat (Q) that occurs when 7.58grams of steam at 101°C cools to liquid water at 40°C. (cp = 4.184 J/g°C)
Answer:
Q = 19065.4 J
Explanation:
Q₁ = the required energy for phase change of H₂O from vapor to liquid
Q₁ = mass of H₂O * heat of vaporization
Q₁ = 7.58 g * 2260 J/g
Q₁ = 17130.8 J
Q₂ = energy required to cool the water fro 101°C to 40°C
Q₂ = mass of H₂O * specific heat of H₂O * ΔT
Q₂ = 7.58 × (4.184 J/gC) × (101 - 40)
Q₂ = 1934.6 J
Q = Q₁ + Q₂
Q = (17130.8 + 1934.6) J
Q = 19065.4 J
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:
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?
HELP WITH THIS WORD PROBLEMStudents want to gather evidence for the claim that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction. They decide to react vinegar and baking soda in a sealed plastic bag. Which of the following would provide the evidence the students need?
The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
Bubbles were produced during the reaction, which meant that a gas was being produced
.The plastic bag did not change in any way, indicating that it was not involved in the reaction.
The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.
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
Give me lil reasoning so I know your not lying for points
:(
(I’ll mark you as brainlister )
Answer:
C
Explanation:
An inverse relationship means that as one increases the other decreases. From the negative slope of this graph, you can tell that as volume increases, pressure decreases. If you look at the data point for 20 on the volume axis, it matches up with about 240 on the pressure axis.
A swimmer is moving at a speed of 2.0 meters/second. How long will it take for the swimmer to go 100 meters?
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
Learn more: https://brainly.com/question/2510654
Is the fractional distillation of liquefied air a physical or chemical change?
Answer:
Physical Chanhe is the answer : )
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:
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
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.
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
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!! 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
give an example of competition in an ecosystem
hbzjaj
Explanation:
competition for food
answer pls ill give brainly
How is energy from the sun used as food energy by organisms in an ecosystem?
Energy from the sun is absorbed as heat by consumers.
Energy from the sun is absorbed by fungi, and it is then passed on to consumers.
Energy from the sun is converted into food energy by producers, which is then passed on to consumers.
Energy from the sun is converted into food by consumers, which is then passed on to producers.
Answer:
its absorbed by heat from consumers
How many protons are in an oxygen atom.
Answer:
Hello
there are 8 protons in oxygen atom
Explanation:
thanks...hope it helps
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
Classify the following as homogeneous or heterogeneous mixtures, or pure
we
is a pure substance, whether it is an element or a
Mixture: homogeneous/
Substance
heterogeneous
Pure substanca
element companie
2.1 Sugar
2.2 Magnesium ribbon
2.3 Vegetable soup
2.4 Bath oil
2.5
Tin of assorted biscuits
2.6
Peanuts and raisins
2.7 Copper wire
2.8
Bicarbonate of soda
(Baking soda)
Explanation:
Sugar - Pure substance
Magnesium Ribbon - Pure Substance
Vegetable soup Heterogeneous mixture
Bath oil - Homogeneous mixture
Tin of assorted biscuits - Heterogeneous mixture
Peanuts and raisins - Heterogeneous mixture
Copper wire - Pure Substance
Bicarbonate of soda (Baking soda) - Pure Substance
80g of Sodium react with 40g of Chloride to produce a product of Sodium Chloride. How many grams of sodium chloride will be present after this chemical reaction?
Na2 + 2Cl2 —> 2NaCl2
Students in Ms.Tillman’s class added 100 grams of copper to 15 grams of oxygen. A chemical reaction occurred produced copper oxide, as shown in the equation below
2 Cu + ___O2 —> 2 CuO
What type of reaction is this?
How many total grams should be present at the end of the chemical reaction?
Which choice represents a compound?Required to answer. Single choice.
(1.5 Points)
Cu
Fe
CO
Br
Answer:
CO
Explanation:
Elements will only one capital letter, that may/may not have a lower case letter after it. CO has a capital letter followed by another capital, so it's a compound
5. Keratin and collagen are examples of *
li
Answer:
Structural proteins
Explanation:
Glad I could Help Pls Brainliest
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
A teacher tells the student to dlaw the same wave with double the frequency, while keeping the amplitude the same. How would the student draw the new wave?
Answer:
A.
Explanation:
Frequency is how often one complete cycle or wave takes place. Amplitude is the height of the wave from the midpoint to the crest.
The new drawing should have twice as many waves in the same period of time, with the same height wave.
Answer:
A.)
Explanation:
Frequency is how often one complete cycle or wave takes place. Amplitude is the height of the wave from the midpoint to the crest.
The new drawing should have twice as many waves in the same period of time, with the same height wave.
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.