Answer:
Q = -897 kJ/mol
Explanation:
From the given information:
The heat released Q = -65.9 kJ
To start with the molar mass of [tex]H_2O_2[/tex] = 2 × (molar mass of H) + 2 × (molar mass of O)
= (2 × 1.008) + (2 × 16.0 )
= 34.016 g/mol
However, given that:
mass of [tex]H_2O_2[/tex] 2.50 g
The number of moles of [tex]H_2O_2[/tex] = [tex]\dfrac{mass}{molar \ mass}[/tex]
[tex]= \dfrac{2.5}{34.016}[/tex]
[tex]= 7.349 \times 10^{-2} \ mol[/tex]
Finally; Using the formula:
[tex]\Delta H = \dfrac{Q}{number \ of \ moles}\\ \\ Q = \dfrac{-65.9 \ kJ}{7.349 \times 10^{-2} \ mol}[/tex]
Q = -897 kJ/mol
Engineers find a new metal that is stronger than steel.. (so on)
Answer is : D "Collaborate with other engineers in the design of a plane made from this metal".
Answer:
Explanation:
same thing as normal plane. just replace normal metal with this new sick metal :cool:
also make sure it weighs a good amount and won't fall from weight... im confused was this already answered???
Answer:
Collaborate with other engineers in the design of a plane made from this metal
Explanation:
<3
Name the type of marked carbon
[This is the stem]
When 2 moles of Mg3N2 are allowed to react, how many moles of H20 also react?
Mg, Na(s) + 6H20(1)
3Mg(OH)2(s) + 2NH3(g)
1 mole
4 moles
6 moles
8 moles
12 moles
Answer:
12 moles of water (E)
Explanation:
The first step is to see that the equation is balanced. It is now, but you did something strange to the Mg3N2.
Mg3N2(s) + 6H20(l) ======> 3Mg(OH)2(s) + 2NH3(g)
What the equation is telling you is that 1 mol of Mg3N2 requires 6 moles of water for the reaction to occur.
So 2 mols of Mg3N2 would require 6*2 mols of water to react.
The answer is 12 moles of water
How many grams of aluminum are needed to completely react with
192 g of oxygen gas?
Answer:
4.28g
Explanation:
What is the pH of sulfuric acid?
Explanation:
0.3,1.2, or 2.1. sorry if it's wrong.
If this temperature on Earth increases what effects would this have all over the world? Match each highlighted region with the most likely effect.
Answer:
Explanation:
Explanation:
If Earth’s temperatures increase, it would likely have these effects:
The East Coast of the United States will face an increased risk of hurricanes as warmer waters increase evaporation.
The polar region will experience melting ice caps, which will cause sea levels to rise.
Warmer water in the Great Lakes will cause heavier lake-effect snows.
In the Pacific Ocean, heating of the water will cause a change in convection currents.
Hot, dry conditions will increase the risk of wildfires in the forests of California.
In the Himalayas, animal and plant life will migrate to higher ground to live.
The coastal regions of Europe will be at greater risk of flooding because of rising sea levels.
Individual Laboratory Follow-up Questions a. Explain the purpose of the experiment. b. What are reasonable sources of error for determining calcium ion concentration by the titration process? c. Summarize the conclusions for your experiment in two to three complete sentences. Include the amount of calcium in your soil.
Solution :
a). In this experiments, we can determine the hardness of the water or [tex]$Ca^{2+}$[/tex] ion concentration in the sample.
b). The Possible errors are :
- During the weighing of calcium standard preparation, if the balance is not traced properly, it will cause an error.
- By dilution of standard from the stock will lead a dilution error of 0.1 mL for 100 mL.
- Misreading the liter values will give an error.
c). Depending upon the calcium content present in the soil, we conclude that the fertile percent of the soil as well as the mineral capacity of the soil.
Most physical and chemical changes in matter include a change of energy true or false
Answer: true
Explanation:
Energy changes are a common component of physical and chemical changes in matter. Hence the statement is True.
Briefing:Physical changes and chemical changes are the two different types of changes that chemists examine. A substance can undergo physical changes without having its identity altered. Chemical transformations take place when one substance transforms into another.
Which is a chemical change?When one chemical material changes into one or more others, as when iron rusts, this is referred to as a chemical transformation. Chemical reactions produce changes in the way that atoms and molecules are ordered, which leads to the formation of new substances with new properties.
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Hillsdale and Cordera are the same distance from the equator, and both are near the ocean. Is Cordera warmer, colder, or the same temperature as Hillsdale? Explain using wrods energy level, temperature, current
Answer:
Cordera is colder than Hillsdale.
Explanation:
They may be at a similar latitude. But you also have to consider the currents nearby the location.
The prevailing wind closer to the equator which carries warm current hits Hillsdale which is why it follows the coastline of the continent. However, for Cordera prevailing winds carrying cold currents hits the continent and follows or hits the coastline of Cordera.
Which of the following statements are true?
Question 1 options:
Chemical equilibrium is achieved when there is a higher concentration of products.
Chemical equilibrium can never be achieved.
When the concentrations of reactants and products remain constant chemical equilibrium is achieved.
Chemical equilibrium is achieved when there is a higher concentration of reactants.
The true statement is that the concentrations of reactants and products remain constant chemical equilibrium is achieved.
What is equilibrium?Equilibrium is a condition where no change in the system of the reaction takes place.
If we represent a chemical reaction in the equilibrium state as:
A + B ⇄ C + D
Where, A & B are reactants and C & D are products and at the equilibrium condition concentration of reactant as well as of products remain constant which is dedicated by double headed arrow.
Higher concentration of product shows the forward condition of the reaction.Higher concentration of reactants shows the backward condition of the reaction.Hence in equilibrium concentration of reactants as well as of products are constant.
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which property of steel is useful for making the car body circle the correct answer
ductile magnetic
sonorous strong
Help I can’t figure it out.
Which type of radiation poses the fewest safety issues?
A. Beta
B. Gamma
C. Alpha
D. X-rays
Answer:
C. Alpha
Explanation:
I did it and I got it right
Answer: C. Alpha
Explanation:
Which of the following molecules has a nonlinear structure?
Answer:
SnCl2 is nonlinear due to the presence of lone pair of electrons on the central atom.....
As a rollercoaster travels upward what type of energy transfer is taking place?A.electrical to thermal energy B.kinetic to potential energy C.mechanical to chemical energy D.potential to kinetic energy
Answer:
B.
Explanation:
Question 3.
The practice of growing two or more dissimilar crops in the same field one after another is
(a) crop rotation
(b) tilling
(c) plantation
(d) weeding
Answer:
(a) Crop rotation.
Explanation:
Crop rotation is the rotational cultivation of crops one after another in the same field or area. This means that different crops are cultivated in sequence, one after the other, on a rotational basis.
Crop rotation is one way of maintaining the nutrients of the soil. It also allows for the production of different crops without the need to move from one place to another. Crop rotation also helps in growing seasonal crops, thereby making crop production stable, providing a constant supply of crops for the farmers.
Thus, the correct answer is option a.
1. Currently, California students are in class 240 minutes every day. How many hours is this?
Answer:
4 hours a day
Explanation:
240/60=4
How much volume will 8.8 moles of gas fill at 0.12 atm at 56*C
Answer:
2000 L
General Formulas and Concepts:
Atomic Structure
MolesTemperature Conversion: K = °C + 273.15Gas Laws
Ideal Gas Law: PV = nRT
P is pressureV is volume (in L)n is number of molesR is gas constantT is temperature (in K)Explanation:
Step 1: Define
[Given] 8.8 moles gas
[Given] 0.12 atm
[Given] 56 °C = 329.15 K
Step 2: Solve for V
Substitute in variables [Ideal Gas Law Formula]: [tex]\displaystyle (0.12 \ atm)V = (8.8 \ mol)(0.0821 \ \frac{L \cdot atm}{mol \cdot K})(329.15 \ K)[/tex]Isolate V: [tex]\displaystyle V = \frac{(8.8 \ mol)(0.0821 \ \frac{L \cdot atm}{mol \cdot K})(329.15 \ K)}{(0.12 \ atm)}[/tex]Multiply/Divide [Cancel out units]: [tex]\displaystyle V = 1981.7 \ L[/tex]Step 3: Check
Follow sig fig rules and round. We are given 2 sig figs.
1981.7 L ≈ 2000 L
How much heat will be transferred when 0.54g of sulfur reacts with 0.54g of oxygen to produce sulfur trioxide according to the following reaction:
2 S + 3 O2 =2 SO3 + 790kJ
Answer:
-4.4 kJ
Explanation:
True or false when matter changes it’s state it is a physical change because it is the same substance the whole time.
Answer:
true
Explanation:
Calculate and Convert (Due Tonight Please Help)
Sorry but I really need these points I just need 5 more sorrrryyy
How many grams of K2O can be made from 43 g of potassium and 32 g of oxygen from the following
equation?
4K + 02 --> 2K2O
Answer:
51.81g of K2O are produced
Explanation:
Based on the reaction, 4 moles of K reacts per mole of oxygen to produce 2 moles of K2O. To solve this question we must find the moles of each reactant in order to find the limiting reactant. With limiting reactant we can find the moles of K2O produced and its mass:
Moles K -Molar mass: 39.0983g/mol-
43g * (1mol / 39.0983g) = 1.1 moles K
Moles O₂ -Molar mass: 32g/mol-
32g * (1mol / 32g) = 1mol O₂
The moles required for the reaction of 1 mole of O₂ are 4 moles of K. As there are just 1.1 moles, K is the limiting reactant.
The moles and the mass of K2O produced are:
1.1moles K * (2mol K2O / 4mol K) = 0.55 moles K
Molar mass K2O = 94.2g/mol
0.55 moles K * (94.2g / mol) =
51.81g of K2O are producedIf 747 joules of energy is added to a sample of aluminum (specific heat capacity = 0.899 J/g*C) and the temperature goes up from 105.0*C to 121.0*C, what is the mass of the aluminum sample?
Answer:
m = 51.93 grams
Explanation:
Given that,
Energy added, Q = 747 joules
The specific heat capacity of Aluminium, c = 0.899 J/g°C
The temperature goes from 105.0°C to 121.0°C.
Let the mass of the aluminum sample is m. We know that, the heat added to the system is given by :
[tex]Q=mc\Delta T\\\\m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{747}{0.899 \times (121-105)}\\\\m=51.93\ g[/tex]
So, the mass of the sample is 51.93 grams.
From the scenarios described below, which would most likely lead to the formation of a hurricane?
A. a high pressure zone meeting a low pressure zone over warm land
B. thunderstorms meeting over cool ocean water
C. thunderstorms meeting over warm ocean water
D. a warm front and a cool front meet over warm water
Answer:
D.
Explanation:
Hurrocanes are caused from un wanted mixed weather
Why does the first method for determining volume work only for a regularly shaped object?
Answer:
please give me brainlist and follow
Explanation:
when using first method for regular shape and 2nd method for an irregular shape. ... It will not work because the weight is different.
What is the highest sublevel for the element Boron?
Answer:
2p
Explanation:
Boron is a member of group 13. The highest energy sub-level is usually found on the outermost shell of the atom of the element involved.
For a group 13 element, its outermost shell configuration is ns2 np1. The electronic configuration for boron is; 1s2 2s2 2p1.
Hence the highest energy sub-level in boron is 2p.
Ametal used in hot water system?
Answer:
Nichrome
Answer: Hot water system coils are commonly made up of metal alloys which are a combination of two or more elements. The most commonly used metal alloy is “Nichrome”. Nichrome is an alloy of nickel (80%) and chromium (20%).
Using spdf notation, what is the electron configuration for a neutral atom of beryllium
Answer:
Beryllium
Explanation:
The bond between which two atoms is most
polar?
(1) C-0
(3) H-O
(2) F-F
(4) N-H
TOITTI
The bond between hydrogen (H) and oxygen (O) (option 3: H-O) has the highest electronegativity difference (1.24). Therefore, the H-O bond is the most polar among the given choices.
The polarity of a chemical bond depends on the electronegativity difference between the two atoms involved. The greater the electronegativity difference, the more polar the bond.
Let's compare the given bond options:
(1) C-O: The electronegativity of carbon (C) is approximately 2.55, and the electronegativity of oxygen (O) is approximately 3.44. The electronegativity difference is 0.89.
(3) H-O: The electronegativity of hydrogen (H) is approximately 2.20, and the electronegativity of oxygen (O) is approximately 3.44. The electronegativity difference is 1.24.
(2) F-F: Fluorine (F) is the most electronegative element with an electronegativity of 3.98. Since both atoms in this case are fluorine, the electronegativity difference is 0.
(4) N-H: The electronegativity of nitrogen (N) is approximately 3.04, and the electronegativity of hydrogen (H) is approximately 2.20. The electronegativity difference is 0.84.
From the options provided, the bond between hydrogen (H) and oxygen (O) (option 3: H-O) has the highest electronegativity difference (1.24). Therefore, the H-O bond is the most polar among the given choices.
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Vibrating molecules and atoms are an example of ___________________ energy, which falls into the ______________________ energy category.