Answer:
it's the example of heterogeneous mixture..
What is the hydrogen ion concentration of a solution with pH = 8.75 ?
Answer:
The answer is 1.778*10^-9
Explanation:
Using the formula
pH = -log[H^+]
Since the pH of the solution has been given to be 8.75,
Therefore,
8.75= -log [H^+]
Let's take H^+ to be x
8.75= -log x
Let's look for x, since the log is in base 10
X = 10^-8.75
X = 1.778 * 10^ -9
Therefore, H^+ =1.778 *10^-9
Of 0.605 g of magnesium hydroxide reacts with 0.800 g of sulfuric acid, what is the mass of magnesium sulfate produced? Steps would be appreciated! Thanks (:
Answer:
Mass = 0.963 g
Explanation:
Given data:
Mass of Mg(OH)₂ = 0.605 g
Mass of H₂SO₄ = 0.800 g
Mass of MgSO₄ = ?
Solution:
Chemical equation:
Mg(OH)₂ + H₂SO₄ → MgSO₄ + 2H₂O
First of all we will calculate the number of moles of each reactant.
Number of moles of Mg(OH)₂:
Number of moles = mass / molar mass
Number of moles = 0.605 g / 58.32 g/mol
Number of moles = 0.01 mol
Number of moles of H₂SO₄ :
Number of moles = mass / molar mass
Number of moles = 0.800g / 98.08 g/mol
Number of moles = 0.008 mol
Now we will compare the moles of MgSO₄ with Mg(OH)₂ and H₂SO₄
Mg(OH)₂ : MgSO₄
1 : 1
0.01 : 0.01
H₂SO₄ : MgSO₄
1 : 1
0.008 : 0.008
The number of moles of magnesium sulfate produced by sulfuric acid are less so it will be a limiting reactant.
Mass of magnesium sulfate:
Mass = number of moles × molar mass
Mass = 0.008 mol × 120.37 g/mol
Mass = 0.963 g
Question 4 of 15 2 Points
If 100 joules of heat are added to a gas in an isochoric process, what is the
change in its internal energy?
O A. -100
O B. 300 j
.2003
O D. 100
Answer:D. 100 j
Explanation:
Answer:
100 J
Explanation:
I've just answered this on a quiz
For a different reaction, Kc = 1.39, kf=12.6s−1 , and kr= 9.08 s−1 . Adding a catalyst increases the forward rate constant to 4.28×103 s−1 . What is the new value of the reverse reaction constant, kr, after adding catalyst?
Answer:
Explanation:
The equilibrium constant is equal to the quotient of the forward rate to the reverse rate.
Adding a catalyst increases both the forward rate and the reverse rate in the same proportion without net effect on the equilibrium position.
Then, the equilibrium constant before and after adding the catalyst is the same.
Thus, knowing the forward rate constant and the equilibrium constant you can determine the reverse rate constant:
1. Which is not an example of a physical change to a wooden stick? A) slicing wood shavings from the stick
B) bending the stick back and forth
C) burning the stick
D) chopping the stick in half
The answer is C. burning the stick. This is because burning the stick will change the chemical properties of the wood, and it will not be wood anymore, it will be ash and the rest will be heart or gas.
Answer:
C) Buring the stick
Explanation:
Oh no! The thermometer punctured a hole in the bottom of the coffee cup, and water is spilling out.
Check all actions you would take.
Throw the broken pieces away.
Use the punctured cup as the outside cup,
not the inside cup.
0 Replace the cup
O Clean the area
| Mention the spill to the teacher.
O Call 9-1-1
Answer:Throw the broken pieces away, Replace the cup, Clean the area, Mention the spill to the teacher.
Explanation:
Answer:
1,3,4,5
Explanation:
A chemistry teacher adds 50.0 mL of 1.50 M H2SO4 solution to 200 mL of water. What is the concentration of the final solution? Use M subscript i V subscript i equals M subscript f V subscript f..
0.300 M
0.375 M
6.00 M
7.50 M
Answer:
Explanation:
This question tests for concentration after dilution of the solution. is added to 200ml of water.
The formula for concentration correlation is given as , where the latter relates to the final solution mix.
Therefore the concentration is 0.300M
Answer:
a on edge
Explanation:
Lab Report: Factors Affecting Solution Formation 1. On the basis of your results, what is the relationship between the temperature of the solvent and the solubility of KCl and KClO3 (Show the both graphs)?
2. Provide the two unknowns A and B and describe how you determined the identity using your data.
3. Explain three factors the affect how fast substances dissolve.
PLEASE HELP ME WITH THESE QUESTIONS
Answer:
Maybe the number of atoms, Numbers of ions formed, and strength of the various bonds.
Explanation:
Bicycles- How do different forms of transportation meet people’s transportation needs?
Answer: Different ways of transportation mean getting to one place by multiple different transportation it actually all depends on were you need to go
Explanation:
Which example of transportation most likely involves the widest variety of vehicles? A. Blood is rushed from a blood bank to a local hospital.
B. Fresh vegetables are transported from a farm to a nearby city.
C. science textbook is transported from a printer in China to your school, and then to your home.
D. Gravel from a gravel pit is transported to construction sites across the state.
In the equation below, identify the Brønsted-Lowry acid, Brønsted-Lowry base, conjugate acid, conjugate base. NH4+(aq) + NO-2 (aq) = HNO2(aq) +NH3(aq)
Answer:
HNO₂ is Bronsted- Lowery conjugate acid.
NH₃ is Bronsted- Lowery conjugate base.
NH₄⁺(aq) is Bronsted- Lowery acid.
NO₂⁻²is Bronsted- Lowery base.
Explanation:
Bronsted- Lowery acid:
Bronsted- lowery acid is the specie which have capability to donate the proton.
Bronsted- Lowery conjugate base:
The Bronsted- Lowery conjugate base of Bronsted- Lowery acid is the specie which is formed after when an acid donate the proton.
Bronsted- Lowery base:
Bronsted- lowery base is the specie which have capability to accept the proton.
Bronsted- Lowery conjugate acid:
The Bronsted- Lowery conjugate acid of Bronsted- Lowery base is the specie which is formed after when an base accept the proton.
Chemical equation:
NH₄⁺(aq) + NO₂⁻²(aq) → HNO₂(aq) + NH₃(aq)
NH₄⁺(aq) have an extra proton and can donate it so it is Bronsted- Lowery acid.
NO₂⁻² have negative charge and can accept the proton so it is Bronsted- Lowery base.
HNO₂ is Bronsted- Lowery conjugate acid.
NH₃ is Bronsted- Lowery conjugate base.
Which of these factors make hydrogen fuel cells a better option than burning fossil fuels
Answer: Air
Explanation: Fossil fuels mess up the air while Hydrogen fuel cells keep the air clean
1 Point What is the temperature in kelvins of 23°C?
O A. 11.9K
O B. 6279K
OC. 296K
O D. 250k
Answer:
Option C. 296K
Explanation:
T°C = 23°C
To covert the above to Kelvin temperature, use the following equation
T(K) = T°C + 273
T(K) = 23 + 273
T(K) = 296K
How many grams are in 8.9 moles of CaCO3
Answer:
0.0046108957310483
Explanation: you will have to convert it to grams
Which set of products is most likely to result from the combustion reaction shown below? C4H8(l) + 6O2(g) A. 2C2H4O6(g) B. 4CO2(g) + 4H2O(g) C. 4CO3(g) + 4H2(g) D. 4C(s) + 4H2O(l)+ 4O2(g)
Answer:
Option B. 4CO2(g) + 4H2O(g)
Explanation:
Combustion reaction produces CO2 and H20. We need to write a balanced equation to determine the product formed. This is illustrated below:
C4H8 + 6O2 —> 4CO2 + 4H2O
How many atoms are present in 9 molecules of NH4CN?
Answer:
5.418x10^24 atoms
Explanation:
1mole of a substance contains 6.02x10^23 atoms.
From the above, it means that 1mole of NH4CN contains 6.02x10^23 atoms.
Therefore, 9 moles of NH4CN will contain = 9 x 6.02x10^23 = 5.418x10^24 atoms
What is the standard unit of frequency
Answer:
Hertz (I guess you can say love HERTZ)
Explanation:
The hertz (image: Hz) is the determined unit of recurrence in the International System of Units (SI) and is characterized as one cycle for every second. It is named after Heinrich Rudolf Hertz, the principal individual to give definitive evidence of the presence of electromagnetic waves.
How many grams of H3PO4 are produced when 10.0 moles of water react with an excess of P4O10? P4O10(s) + 6H2O(l) → 4H3PO4(aq)
Answer:
652.6 g of H₃PO₄ are formed
Explanation:
Reaction is:
P₄O₁₀(s) + 6H₂O(l) → 4H₃PO₄(aq)
As P₄O₁₀ is the reactant in excess, the limiting is water.
Ratio is 6:4. We make a rule of three:
6 moles of water produce 4 moles of phosphoric acid
Therefore, 10 moles of water may prodyce (10 .4) / 6 = 6.66 moles of H₃PO₄
We convert the moles to mass:
6.66 moles . 97.9 g / 1mol = 652.6 g
Answer:
652.6 g
Explanation:
trust
Which sources of energy are used by humans to produce electrical energy? (a) Plants, animals, and fossil fuels
(b) Wind, water, and fossil fuels
(c) Water, wood, and wind
(d) Wind, water, and soil
Answer:
(b) Wind, water, and fossil fuels
Explanation:
Answer:
b wind water and fossil fuels
What causes events such as earthquakes, volcanic eruptions, and the creation of mountains?
Answer:
Plate Techtonics
Explanation:
Answer:
The answer is C. Explosions occurring in magma chambers
Explanation:
I took the test and got a 100%!!!!