Answer:
If you look at yourself in the front of the spoon, you see that the mirror forms an inverted real image.
Explanation:
The word 'concave' means to bend inwards.
A curved mirror is a mirror that has a curved reflecting surface.
The front side of the spoon is just like a concave mirror. If you look at yourself in the front of the spoon, you see that the mirror forms an inverted real image.
Concave mirrors produce real inverted image of an object only if it is placed further away from the mirror than the focal point.
Answer:
It shows me upside down like a ghost. OoooOooh
Explanation:
Boo
Substitute natural gas (SNG) is a gaseous mixture containing CH4(g) that can be used as a fuel. One reaction for the production of SNG is
4CO(g) + 8H2(g) → 3CH4(g) + CO2(g) + 2H2O(l) ΔHo = ?
Use appropriate data from the following list to determine ΔHo for this SNG reaction.
C(graphite) + 1/2O2(g) → CO(g) ΔHo = -110.5 kJ
CO(g) + 1/2O2(g) → CO2(g) ΔHo = -283.0 kJ
H2(g) + 1/2O2(g) → H2O(l) ΔHo = -285.8 kJ
C(graphite) + 2H2(g) → CH4(g) ΔHo = -74.81 kJ
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔHo = -890.3 kJ
Answer:
ΔH° of the reaction is -747.54kJ
Explanation:
Based on gas law, it is possible to find the ΔH of a reaction using ΔH of half reactions.
Using the reactions:
(1) C(graphite) + 1/2O₂(g) → CO(g) ΔH° = -110.5 kJ
(2) CO(g) + 1/2O₂(g) → CO₂(g) ΔH° = -283.0 kJ
(3) H₂(g) + 1/2O₂(g) → H₂O(l) ΔH° = -285.8 kJ
(4) C(graphite) + 2H₂(g) → CH₄(g) ΔH° = -74.81 kJ
(5) CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) ΔH° = -890.3 kJ
The sum of 4×(4) + (5) gives:
4C(graphite) + 8H₂(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) + 3CH₄(g)
ΔH° = -74.81 kJ ×4 - 890.3 kJ = -1189.54kJ
Now, this reaction - 4×(1) gives:
4CO(g) + 8H₂(g) → CO₂(g) + 2H₂O(l) + 3CH₄(g)
ΔH° = -1189.54kJ - 4×-110.5 = -747.54kJ
Thus ΔH° of the reaction is -747.54kJ
ΔH° of the reaction is for the production of SNG -747.54kJ
Hess law and enthalpyAccording to Hess’ law of constant summation, the standard reaction enthalpy is independent of the pathway or number of the reaction steps taken for a multistep reaction, rather it is the sum of standard enthalpies of intermediate reactions involved at the same temperature.
Based on Hess law, it is possible to find the ΔH of a reaction using ΔH of half reactions.
From the given reactions:
C(graphite) + 1/2O₂(g) → CO(g) ΔH° = -110.5 kJCO(g) + 1/2O₂(g) → CO₂(g) ΔH° = -283.0 kJH₂(g) + 1/2O₂(g) → H₂O(l) ΔH° = -285.8 kJC(graphite) + 2H₂(g) → CH₄(g) ΔH° = -74.81 kJCH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) ΔH° = -890.3 kJThe sum of Reaction 4 × 4 + Reaction 5 - Reaction 1 × 4 gives the reaction below:
4CO(g) + 8H₂(g) → CO₂(g) + 2H₂O(l) + 3CH₄(g)
ΔH° = {-74.81 kJ × 4} - 890.3 kJ {- 4 ×-110.5}
ΔH° = -747.54kJ
Therefore, ΔH° of the reaction is for the production of SNG -747.54kJ
Learn more about enthalpy and Hess' law at: https://brainly.com/question/9328637
what can a criminal do to make the bullet not match the gun hurry plz
find reducing and oxidizing agents
Answer:
SO4^2- is the oxidizing agent.
l^- is the reducing agent.
Explanation:
SO4^2- + I^- + H^+ —> H2S + I2 + H2O
To know which is the oxiding agent or the reducing agent, let us calculate the change in oxidation number of each element. This is illustrated below:
Note: the oxidation number of Hydrogen (H) is always +1 except in hydride where it is -1.
The oxidation number of Oxygen (O) is always -2 except in peroxide where it -1
For S:
SO4 = -2
S + 4O = -2
O = - 2
S =.?
S + (4 x -2) = -2
S - 8 = -2
Collect like terms
S = -2 + 8
S = +6
H2S = 0
2H + S = 0
H = +1
S =..?
2(1) + S = 0
2 + S = 0
Collect like terms
S = 0 - 2
S = -2
The oxidation number of S changes from +6 to -2
For I:
I = - 1
I = 0
The oxidation of I changes from -1 to 0.
Since the oxidation number of S changes from +6 to -2 i.e reduce, therefore SO4^2- is the oxidizing agent.
The oxidation number of I changes from -1 to 0 ie increased. Therefore, l^- is the reducing agent.
Balance the reaction. A coefficient of "1" is understood. Choose option "blank" for the correct answer if the coefficient is "1." 2AgNO₃ + MgCl₂ 2AgCl + Mg(NO₃)₂
Answer:
The balanced equation is: 2AgNO₃ + MgCl₂ ------> 2AgCl + Mg(NO₃)₂
Explanation:
The law of conservation of mass states that in a normal chemical reaction, matter is neither created nor destroyed.
According to the law of conservation of mass, therefore, when a chemical reaction occurs, the mass of the products should be equal to the mass of the reactants. This implies that the amount of the atoms in each element in the chemical reaction remains the same before and after the reaction. A balanced chemical equation therefore, is one that shows that the number of the atoms involved in the reactants side is equal to the number of atoms in the products side.
Considering the given reaction:
2AgNO₃ + MgCl₂ ------> 2AgCl + Mg(NO₃)₂
The amount in moles of each atom in the reaction is as follows;
Ag = 2 moles of atom on each side
N = 2 moles of atoms on each side
O = 6 moles of atoms on each side
Mg = 1 mole of atoms on each side
Cl = 2 moles of atoms on each side
Therefore, the above chemical equation is balanced.
Answer:
The equation is already balanced.
Explanation:
What is the normal boiling point of of a solution containing 64.5g of non volatile quinoline ( MW 129 ) in 500 g of benzene when the normal boiling point is 80.10 and KB = 2.50
Answer:
THE NORMAL BOILING POINT OF A SOLUTION CONTAINING 64.5 g OF QUINOLINE IN 500 g OF BENZENE IS 82.6 C
Explanation:
Boiling point = old boiling point + molarity * boiling point constant (Kb)
First, you calculate the number of moles of quinoline in the solution
number of moles = mass / molar mass
Since the molar mass of quinoline has been given as 129 g/mol
number of moles = 64.5 g / 129 g/mol
number of moles = 0.5 moles.
Next is to determine the molarity:
molarity = number of moles of solute / kilogram of solvent
molarity = 0.5 moles / 500/1000 kg
molarity = 0.5 / 0.5
molarity = 1 M
The new boiling point can then be calculated using the formula:
B. P = old B.P + Kb * molarity
B.P = 80.10 + 2.50 * 1
B.P = 80.10 + 2.50
B.P = 82.6 degree celsius
Does the number of ions in solution increase, decrease, or remain constant?
It decreases at first, then increases.
It continuously increases.
It continuously decreases.
It increases at first, then decreases.
Answer:
It continuously decreases.
A catalyst can only be used once.
True
False
Answer:
False
Explanation:
Catalysts are reusable because they keep the chemical reactions moving without being consumed.
Orange juice has a hydrogen ion concentration of approximately 10^-4. What is the pH of orange juice?
Black coffee has a hydrogen ion concentration of approximately 10^-5. Is black coffee a stronger or weaker acid than orange juice?
Pure water has a hydrogen ion concentration of 10^-7M. What is the pH of water? Is it acid or base?
A) 4
pH=-log[H+]
pH=-log(10^-4)
B) Weaker
pH of orange juice=4
pH of coffee=5
An acid with pH of 4 is stronger than a pH of 5
C) 7, neither/neutral
pH of water=7
What is one way to make stored water safe?
Even though you asked for ONE WAY, I found some other good ways.
1. Thoroughly wash plastic soda bottles or milk jugs with warm, soapy water.
2. Store sealed containers in a dark, dry, and cool place.
3. If after six months you have not used the stored water, empty it from the containers and repeat steps 1 through 3 above.
What is a criterion for all products made using the process of technological design? The product must be cheaper than similar products.
The product must be available to any user who wants it.
The product must solve the problem for which it was designed.
The product must be capable of solving a variety of problems.
Answer:
C. The product must solve the problem for which it was designed.
Explanation:
Technological design is the study, development and application of technological process with the intent of designing a product to solve required problem.The process could be based on the use of a computer.
Generally, technological process and development always tend to design a problem solver product. Through this process, more new technologies are produced.
Therefore in technological process, the product must solve the problem for which it was designed.
Answer:
C) The product must solve the problem for which it was designed.
How are ancient CO2 levels measured?
Answer:
Ancient CO₂ levels can be measured from
1) Air bubbles trapped in deep ancient ice cores (up to 800,000 years ago) or
2) Tree rings (up to 10,000 years ago)
Explanation:
The percentages of CO₂ concentration in the atmosphere from previous or ancient times are found by analyzing the CO₂ content in trapped air located in the deep ancient ice cores present in Antarctica and Greenland such as the EPICA Dome C cores
As the ice is drilled though, the air released from trapped bubbles are captured for analysis and the time frame for the captured bubbles can date back up to 800,000 years
Ancient CO₂ levels can also be measured from tree rings which provide ancient CO₂ levels up to 10,000 years
Photosynthesis produces (4 points)
carbon dioxide and energy
carbon dioxide and oxygen
glucose and oxygen
glucose and carbon dioxide
(I'm pretty positive it's C, but correct me if I'm wrong)
Answer:
Glucose and oxygen is produced during photosyntheis
Explanation:
Carbon dioxide and water are required for photosyntheis producing oxygen and glucose
Answer:
C.Glucose and oxygen
HELP MY CHEMISTRY NERDS PLEASE PLEASE PLEASE !!!!! I WILL LUV U 4EVER
Answer:
A. 40 kPa
Explanation:
P(total) = P(O2) + P(N2) + P(CO2)
300kPa = 160 kPa + 100kPa + P(CO2)
P(CO2) = 300-160-100= 40 kPa
How many moles of ethylene glycol must be added to 1 kg of water to make a solution with a freezing point of -2.4°C? The freezing point depression constant for water is 1.86°C•kg/mol. What is the molality of the solution?
Answer: 1.29 moles of ethylene glycol must be added to 1 kg of water to make a solution with a freezing point of -2.4°C. Molality of solution is 1.29 m.
Explanation:
Depression in freezing point is given by:
[tex]\Delta T_f=i\times K_f\times m[/tex]
[tex]\Delta T_f=T_f^0-T_f=(0-(-2.4))^0C=2.4^0C[/tex] = Depression in freezing point
i= vant hoff factor (for non electrolyte , i = 1)
[tex]K_f[/tex] = freezing point constant for water= [tex]1.86^0C/kgmol[/tex]
m= molality =[tex]\frac{\text{moles of solute}}{\text{weight of solvent in kg}}[/tex]
m= molality =[tex]\frac{x}{1kg}[/tex]
[tex]2.4^0C=1\times 1.86^0C/kgmol\times \frac{x}{1kg}[/tex]
[tex]x=1.29[/tex]
Molality = [tex]\frac{\text{moles of solute}}{\text {weight of solvent in kg}}=\frac{1.29mol}{1kg}=1.29m[/tex]
Thus 1.29 moles of ethylene glycol must be added to 1 kg of water to make a solution with a freezing point of -2.4°C. Molality of solution is 1.29 m.
Answer:
1) C (m=T f/Kf)
2) 2.4 C
3) 1.3 m
4) 1.3 moles
Explanation:
This is correct on ed
What is the name of Al2(CO3)3 ?
Answer: Aluminum Carbonate
Explanation:
Answer:
Aluminum carbonate.
Explanation:
It is an aluminum salt form of carbonic acid.
the list which contains only metals is
Answer:
Hydrogen in its metallic state (usually considered a nonmetal)
Lithium.
Sodium.
Potassium.
Rubidium.
Cesium.
Francium.
Explanation:
Answer:
The list of elements that contains only metals is tin, copper and cesium.
Carbon and iodine aren't metals.
Helium isn't metal.
Neither iodine, carbon, nor argon are metals.
(Hope this helps) Sky
how much volume do the gas molecules take up in an inflated balloon
Answer:
The volume of a gas is determined by the volume of the container it is in. Gases take the shape of their container and the volume of the container....
Explanation:
What happens to the volume or size of a balloon as it rises in the air?
When a balloon goes up higher in the air, its size will increase. Since there's less air in the upper atmosphere, there's less stuff pushing back on the balloon, and hence the pressure is lower, which allows the balloon to expand.
Is pressure inside a balloon greater?
The pressure inside the balloon is higher than the pressure on the outside. ... And the direction of airflow is always from higher to lower pressure. If the pressure was same then there would be no airflow and if the pressure outside was higher , air will flow from outside to the inside of the balloon.
What is the relationship between volume and pressure?
Boyle's law is a gas law, stating that the pressure and volume of a gas have an inverse relationship. If volume increases, then pressure decreases and vice versa, when temperature is held constant. Therefore, when the volume is halved, the pressure is doubled; and if the volume is doubled, the pressure is halved.
Mark as brainliest if liked it. Thanks hope this helps
You make an iron (II) sulfate solution with a molarity of 2.1 M. If the solution is 500 mL total, how many grams of iron (II) sulfate is that?
Answer:
Explanation:
2.1>1000
?>500
(500×2.1)÷1000=1.05moles
Mass= molesx molar mass
1.05×(56+32+(16×4))
1.05×152=159.6g
The disinfectant hydrogen peroxide (H2O2)
decomposes to form water and oxygen gas.
How much O2 will result from the decomposition of 2.22 mol of hydrogen peroxide?
Answer:
1.1 mol of O2
Explanation:
First we need the balance chemical equation which is
2 H2O2 -------> 2 H2O + O2
This is important because in stoichiometry you can go from units of one thing to other by using mole ratios, here the mole ratio is 2 mol of H2O2 for one mole of O2.
[tex]2.2 mol H2O2 \frac{1mol O2}{2 mol H2O2}[/tex] = 1.1 mol of O2
What is the molar mass of Al2(SO4)3?
Answer:
342.14g/mol.
Explanation:
The molar mass of Al2 (SO4)3 is 342.15g/mole.
Reasons that one aluminum atom=26.98. Therefore two aluminum atoms:=2(26.98 g/mole) =53.96 g/mole.
Mass of SO4=96.06g/mol.
Therefore molar mass of Al2(SO4)3= 53.96+(96.06)×3=342.14g/mol
Answer:
342.17 g/mol
Explanation:
Al= 26.98
S= 32.07
O= 16.00
To calculate that you would have
2(26.98) since there are two Als
and then you have to distribute the 3 to the S and O so...
3S and 12O
which is
3(32.07) + 12(16.00)
which means you add
2(26.98) + 3(32.07) + 12(16.00)
=53.96 + 96.21 + 192
=342.17
there you Go! the final answer is 342.17 g/mol.
Why does the ionization energy change when moving down a group of elements?
The number of valence electrons increases.
The nuclear positive charge increases.
The energy levels are increasing.
The attractive force decreases as the atom gets larger.
Answer:
D) The attractive force decreases as the atom gets larger.
Explanation:
i did the lesson and tried all 3, all 3 times, this was the last one and only choice left so it has to be.
Answer:
The attractive force decreases as the atom gets larger.
Explanation:
A 500ml bottle contains 2.50 moles of gas. What is the new volume when the number of miles is increased 5.00 moles?
Answer:
The new volume is 1,000ml
Explanation:
Mathematically, we know that the number of moles per ml(volume) should be constant irrespective of the increase.
Initially, we have a volume of 500 ml and number of moles of 2.5 moles
The ratio of the number of moles to the volume is 2.5/500 = 0.005 mole/ml
Now, this is expected to remain the same even if we have an increment.
let’s call the new volume x
0.005 mol/ml = 5 moles/x ml
x = 5/0.005 = 1,000 ml
Which of the following elements have the same number of valence electrons?
I. Nitrogen (N)
II. Oxygen (O)
III. Fluorine (F)
IV. Sulfur (S)
V. Selenium (Se)
H2(g) + I2(g) ↔2HI(g) + heat. If more I2 is added, in what direction will the equilibrium shift? Group of answer choices
Answer:
Towards the products, or to the right
Explanation:
There are no provided answer choices, but the answer should be to the right.
By Le Chatelier's principle, which basically can be summarized as "if you mess with chemistry, chemistry messes back", if more reactants are added, the equilibrium will shift to the right towards the products in order to make more products and counteract the increase in I₂.
what a neat and well labelled diagram of nitrogen cycle in nature
Answer:
In the picture.
I hope it helps
Explanation:
Nitrogen cycle is a complex process (or sequence of reaction) by which nitrogen is removed and added to the soil.
Which of the following reactions shows that the formation of CO2 releases
393.5 kJ/mol?
A. C(s) + O2(g) → CO2(g) + 393.5 kJ
O B. C(s) + 20(g) + 393.5 kJ → CO2(9)
O C. C(s) + O(g) + CO2(g) + 393.5 kJ
D. C(s) + O2(g) + 393.5 kJ → CO2(g)
Answer:
A. C(s) + O2(g) → CO2(g) + 393.5 kJ
Explanation:
The formation of carbon IV oxide (CO2) is an exothermic process. n exothermic process is a chemical process in which heat is evolved. Speaking in lay man's terminology, heat is one of the 'products' of the reaction. This implies that heat is evolved by the process.
The formation of CO2 is always a combustion reaction where heat is evolved or released by the reaction system. Hence the reaction could be shown as;
C(s) + O2(g) → CO2(g) + 393.5 kJ
This implies that 393.5 kJ of energy is released in the reaction in the form of heat. Hence the answer given in the answer box.
Answer: C(s) + O2(g) → CO2(g) + 393.5 kJ
In the movie bee movie how does the bee berry communicate
Answer:
they stick together as a group and that they berly fought or argue
Answer:first get a jar
Explanation:
Patrick that’s a jokers side special
Which phrase best describes the path of a light wave ?
A. Straight away from the source
B. Spiraling around the source
C. Perpendicular to the source
D. Parallel to the source
Answer:
La B
Explanation:
It's B on Ap3x
Straight away from the source
Read the following statements carefully: X: It is a thick black coloured liquid which is obtained from coal.Y: It was used earlier in railway engines to produce steam to run trains.Z : It is used to run heavy vehicles such as buses, trucks, tractors, etc.X, Y and Z respectively are
Options are not given in the question. The complete question is as follows:
Read the following statements carefully: X: It is a thick black coloured liquid which is obtained from coal.Y: It was used earlier in railway engines to produce steam to run trains.Z : It is used to run heavy vehicles such as buses, trucks, tractors, etc.X, Y and Z respectively are
A. a. Coal tar b. Coal c. Diesel
B. a. Coal b. Paraffin wax c. Petrol
C. a. Coke b. Coal tar c. Kerosene
D. a. Coke b. Coal c. Coal tar
Answer:
A. a. Coal tar b. Coal c. Diesel
Explanation:
Coal Tar is a thick black or dark brown colored liquid obtained from coal. Coal Tar consists of hydrocarbons and free carbon extracted from coal using a process of destructive distillation. So, X is coal tar.
Earlier coal was used to produce steam to run steam engine trains. Air flows are allowed to burn coal hotter, then the hot coal turns water to steam and helps in the locomotive steam engine to run. So, Y is coal.
Deisel is used to run heavy vehicles such as buses, trucks, tractors, etc. because diesel burns at slow speed and produces a higher torque that can move heavy automobiles. So, Z is deisel.
Hence, the correct option is A.
3. Sugar solution(sugar + water) is a homogeneous mixture and sugar can be separated from water through evaporation .Comment.
Plz, answer
Answer:
water is the answer
Explanation:
The sugar and water mix to make sweet water but the sun extracts the sugar from the water leaving only normal water
Answer:
water can be evaporated
Explanation:
the water will be evaporated leaving only the sugar residue behind.
