In the burning food investigation where you are trying to find out which food contains the most energy - what is the independent variable? *
Answers
Answer:
sorry but i dont know it but you can ask me other things
Related Questions
In a closed system, there is 500 J of potential energy and 800 J of kinetic energy and no other forms of energy are present in this
system. Ten years later, the kinetic energy is measured at 300 J. After 10 years, the amount of potential energy is:
O 300 J.
O 800J.
O 500 J.
O 1000 J
Answers
Answer:
I think the answer is 800J
Explanation:
As the kinetic energy goes down, the potential energy goes up
In formaldehyde, CH2O, where carbon is the central atom, the formal charge on the oxygen is zero and the hybridization of the oxygen atom is sp2.
True or False
Answers
In formaldehyde, CH₂O, where carbon is the central atom, the formal charge on the oxygen is zero and the hybridization of the oxygen atom is sp2 is True.
This is because in CH₂O, the carbon atom is sp2 hybridized, and it forms a double bond with the oxygen atom. The other two valence electrons on the oxygen atom occupy two sp2 hybrid orbitals and are non-bonding pairs, giving the oxygen atom a trigonal planar geometry. This arrangement of electrons results in a formal charge of zero on the oxygen atom.
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Write the balanced COMPLETE
ionic equation for the reaction
when ammonium carbonate and calcium chloride are mixed in aqueous solution. If no reaction occurs, simply write only NR. Be sure to include the proper phases for all species within the reaction.
Answers
Answer:
Explanation:
ammonium carbonate + calcium chloride -----> ammonium chloride + calcium carbonate
(NH4)2CO3 + CaCl2 ----> NH4Cl + CaCO3
The balanced chemical equation for the given reaction is (NH₄)₂CO₃ + CaCl₂ ----> NH₄Cl + CaCO₃.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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- Lead acid batteries used in cars contain a concentrated
solution of sulfuric acid. When these batteries are
recycled, their sulfuric acid is drained and neutralized to
produce water and sodium sulfate. Suggest a compound
that could be used to neutralize sulfuric acid and produce
sodium sulfate. Justify your choice by writing the chemical
equation for the reaction.
Answers
As per the chemical reaction ,sodium hydroxide can be used for neutralization of sulfuric acid as,2 NaOH+H₂SO₄\(\rightarrow\)Na₂SO₄ +2 H₂O.
What are chemical reactions?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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The amount of radioactive carbon-14 in a sample is measured using a Geiger counter, which records each disintegration of an atom. Living tissue disintegrates at a rate of about 13.5 atoms per minute per gram of carbon. In 1977 a charcoal fragment found at Stonehenge, England, recorded 8.2 disintegrations per minute per gram of carbon. Assuming that the half-life of carbon14 is 5730 years and that the charcoal was formed during the building of the site, estimate the date when Stonehenge was built
Answers
Answer:
4121 years
Explanation:
From;
0.693/t1/2 = 2.303/t log No/N
t1/2= half life of the carbon-14
No= count rate of the living tissue
N= count rate of the sample
t = age of the sample
0.693/5730 =2.303/t log (13.5/8.2)
1.21 * 10^-4 = 2.303/t * 0.2165
1.21 * 10^-4 = 0.4986/t
t = 0.4986/1.21 * 10^-4
t = 4121 years
1) Predict the overall reaction from the following two-step mechanism:2A -> A2 (slow)A2 + B -> A2B (fast)Express your answer as a chemical equation.2) Predict the rate law from the following two-step mechanism:2A -> A2 (slow)A2 + B -> A2B (fast)Express your answer in terms of k, [A] and [B] as necessary.___________________________________________________________3) What is the rate law for the following mechanism in terms of the overall rate constant k?Step 1: A + B ⇌ C (fast)Step 2: B + C -> D (slow)
Answers
1) To predict the overall reaction from the two-step mechanism, you need to add the two individual reactions together. Here are the given reactions:
Step 1: 2A -> A2 (slow)
Step 2: A2 + B -> A2B (fast)
Add the two reactions together:
2A + A2 + B -> A2 + A2B
Now, cancel out the A2 from both sides:
2A + B -> A2B
The overall reaction is:
2A + B -> A2B
2) To predict the rate law from the two-step mechanism, we need to consider the slow step, as it determines the overall reaction rate. The slow step is:
2A -> A2 (slow)
The rate law for this step is:
Rate = \(k[A]^{2}\)
Since the slow step only involves the reactant A, the overall rate law is:
Rate = \(k[A]^{2}\)
3) To determine the rate law for the given mechanism in terms of the overall rate constant k, we need to focus on the slow step:
Step 1: A + B ⇌ C (fast)
Step 2: B + C -> D (slow)
The slow step determines the rate:
Rate = k'[B][C]
However, we need to express the rate law in terms of A and B. From the first step, we can write the equilibrium constant:
K = [C]/([A][B])
Rearrange for [C]:
[C] = K[A][B]
Now, substitute this expression for [C] into the rate law for the slow step:
Rate = k'[B](K[A][B])
Rate = \(k[A][B]^{2}\)
Since k' and K are constants, we can combine them into a single constant, k:
Rate =\(k[A][B]^{2}\)\(k[A][B]^{2}\)
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The lengths of the sides of a triangle are 7 cm, 4 cm, and 10 cm. Change the length of the longest side so the lengths will form a right
triangle. What is the new length? Round your answer to the nearest tenth
Answers
To change the lengths of the sides of a triangle (7 cm, 4 cm, and 10 cm) so they form a right triangle, we need to modify the length of the longest side. By using the Pythagorean theorem, which states that in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides, we can determine the new length. In this case, the new length of the longest side, rounded to the nearest tenth, is approximately 10.8 cm.
In a right triangle, the Pythagorean theorem can be used to relate the lengths of the sides. According to the theorem, in a right triangle with sides of lengths a, b, and c (where c is the hypotenuse, the side opposite the right angle), the following equation holds true: a^2 + b^2 = c^2.
In the given triangle, the longest side is 10 cm. To make the lengths form a right triangle, we need to modify the length of the longest side. Let's assume that the new length is x.
Using the Pythagorean theorem, we can set up the equation: 7^2 + 4^2 = x^2.
Simplifying the equation, we have 49 + 16 = x^2, which becomes 65 = x^2.
Taking the square root of both sides, we find that x ≈ 8.06.
Therefore, the new length of the longest side, rounded to the nearest tenth, is approximately 8.1 cm.
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Benzene gas C6H6 is burnt in a combustion chamber in a steady flow, constant pressure process, with 90% theoretical air. The fuel, which has a flow rate of 0.05 kg/min, enters the chamber at a temperature of 298K. The air enters at 500K, and the exhaust products leave the chamber at 1300K. Determine: (i) The air/fuel ratio by mass (ii) The rate of heat loss in kW from the combustion chamber (10 marks
The molecular weights of carbon, oxygen and nitrogen are as follows:
Carbon (C) = 12 kg;
= 2 kg Oxygen (O2) = 32kg; Nitrogen (N2) = 28 kg; Hydrogen (H2)
Answers
(i) The air/fuel ratio by mass is approximately 0.0487 kg air / kg fuel.
(ii) The rate of heat loss from the combustion chamber is approximately 0.0349 kW.
To solve the given problem, we need to determine the air/fuel ratio by mass and the rate of heat loss from the combustion chamber. Let's calculate each of these values step by step:
(i) Air/Fuel Ratio by Mass:
To calculate the air/fuel ratio by mass, we need to determine the mass flow rates of air and fuel entering the combustion chamber.
Given:
Flow rate of fuel (benzene): 0.05 kg/min
To find the mass flow rate of air, we need to determine the stoichiometric ratio between air and fuel. The balanced equation for the combustion of benzene (C₆H₆) is:
C₆H₆ + (15/2)O₂ → 6CO₂ + 3H₂O
From the balanced equation, we can see that 1 mole of C₆H₆ reacts with (15/2) moles of O₂. Therefore, the stoichiometric ratio of air to fuel is:
(15/2) * (32 kg O₂ / 1 mole O₂) / (78 kg C₆H₆ / 1 mole C₆H₆) = 20.51 kg air / kg fuel
The air/fuel ratio by mass is the inverse of the stoichiometric ratio:
1 / (20.51 kg air / kg fuel) = 0.0487 kg fuel / kg air
Therefore, the air/fuel ratio by mass is approximately 0.0487 kg air / kg fuel.
(ii) Rate of Heat Loss from the Combustion Chamber:
To determine the rate of heat loss, we can use the energy balance equation for the combustion chamber. The energy balance equation is:
Q_in - Q_out - W_out = ΔE_system
where:
Q_in = Heat input from fuel combustion
Q_out = Heat loss from the combustion chamber
W_out = Work output from the combustion chamber
ΔE_system = Change in internal energy of the combustion chamber
In this case, the process is steady flow and constant pressure, so there is no work output (W_out). Additionally, we can assume that there is no change in internal energy (ΔE_system ≈ 0) since the temperature difference is relatively small.
Therefore, the energy balance equation simplifies to:
Q_in - Q_out = 0
This means that the heat input from fuel combustion is equal to the heat loss from the combustion chamber.
To calculate the rate of heat loss, we need to determine the heat input from fuel combustion. The heat of combustion for benzene (C₆H₆) is -3267 kJ/mol.
Given:
Flow rate of fuel (benzene): 0.05 kg/min
Heat of combustion of benzene: -3267 kJ/mol
First, we need to convert the flow rate of fuel to moles per minute. The molar mass of benzene (C₆H₆) is:
(6 * 12 kg/mol) + (6 * 1 kg/mol) = 78 kg/mol
The moles of benzene consumed per minute is:
(0.05 kg / min) / (78 kg/mol) = 0.000641 mol / min
The heat input from fuel combustion is:
Heat input = moles of fuel * heat of combustion
= 0.000641 mol / min * (-3267 kJ/mol)
= -2.095 kJ/min
Since the heat input and heat loss are equal (Q_in = Q_out), the rate of heat loss from the combustion chamber is 2.095 kJ/min (or 0.0349 kW).
Therefore, the rate of heat loss from the combustion chamber is approximately 0.0349 kW.
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How can water pollution be reduced?
Answers
Answer:
Don't throw paints, oils or other forms of litter down the drain. Use environmentally household products, such as washing powder, household cleaning agents and toiletries. Take great care not to overuse pesticides and fertilisers. This will prevent runoffs of the material into nearby water sources.
A sample containing 15.0 g of dry ice (CO₂ (s)) is put into a balloon
and allowed to sublime according to the following reaction:
CO₂ (s) → CO₂ (g)
How big will the balloon be (i.e; what is the volume of the balloon), at 22 °C and
1.04 atm, after all of the dry ice has sublimed?
Answers
The Ideal Gas Law may be used to determine the balloon's volume. According to the Ideal Gas Law, a gas's pressure, temperature, and volume are all correlated. PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is temperature, is the exact equation.
We can find V by using the information that has been supplied. We must first determine how many moles of CO2 are in the sample. To calculate this, divide the dry ice's (15.0 g) mass by the molar mass of carbon dioxide (44.01 g/mol). We now have 0.340 moles of CO2.
The gases which are perfect that obeys the ideal laws that is the equation for the ideal can be implied to it.
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1) Conversion Factors: 1 package = 10 oz
How many packages(pkgs) are in 10 ounces (oz) of marshmallows (mm)? 1 pky
Answers
Please help
1: Wood being sawed in half is an example of _____________________.
2: Dicing tomatoes is a physical change. T or F
3: Milk turns sour. This is an example of _______________.
4: The mass of lead is a ______ property.
5: Which of the following is a physical change?
6: Which of the following is a chemical change?
7: Which of the following is a chemical change?
Answers
Answer:
1. Physical change
2. T
3. Chemical change
4. Physical
5. ?
6. ?
7. ?
Explanation:
There are no choices listed for 5, 6, and 7 but I can help with those if you add a picture or clarification.
When the core of a star like the sun uses up its supply of hydrogen for fusion, the core begins to______________ shrink but maintain constant temperature expand shrink and cool shrink and heat.
Answers
When the core of a star like the sun uses up its supply of hydrogen for fusion, the core begins to shrink but maintains a constant temperature.
The core of a star like the sun is where hydrogen fusion takes place. During this process, hydrogen atoms combine to form helium, releasing a large amount of energy in the form of heat and light. However, the supply of hydrogen in the core is not infinite, and eventually, the core will run out of hydrogen fuel.
When this happens, the core of the star begins to shrink due to the gravitational pull of the outer layers of the star. As the core shrinks, the pressure and temperature in the core increase, causing helium fusion to occur. This new fusion process generates enough energy to counteract the gravitational force, and the core stabilizes.
During this phase, the core is smaller but maintains a constant temperature. The energy generated by helium fusion balances the inward gravitational force, preventing the core from shrinking further. The outer layers of the star will continue to burn hydrogen, releasing energy and preventing the star from collapsing completely.
The star will eventually enter a new phase of evolution, depending on its mass and composition.
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How many moles is 1.8 x 1023 atoms of Be?
Answers
Answer:
3.0059572661984113e-24
Explanation:
10. If 3.5 kJ of energy are added to a 28.2 g sample of iron at 20°C, what
is the final temperature of the iron in kelvins? The specific heat of iron
is 0.449 J(g•K).
Answers
Answer:
569K
Explanation:
Q = 3.5kJ = 3500J
mass = 28.2g
∅1 = 20°C = 20 + 273 = 293K
∅2 = x
c = 0.449
Q = mc∆∅
3500 = 28.2×0.449×∆∅
3500 = 12.6618×∆∅
∆∅ = 3500/12.6618
∆∅ = 276.4220
∅2 - ∅1 = 276.4220
∅2 = 276.4220 + ∅1
∅2 = 276.4220 + 293
∅2 = 569.4220K
∅2 = 569K
When the temperature is increased, there is the increase in thermal energy of the system. The final temperature of the iron in kelvins is 570 K.
What is energy?The energy is the ability to do work.
Given is the energy Q = 3.5 kJ = 3500 J, mass of sample m = 28.2 g, specific heat of iron Cp = 0.449 J(g•K).
The initial temperature in kelvins is T1 = 20°C = 20 + 273 = 293K
The heat is related to the temperature difference as
Q = m c ∆T
Substitute the values into the expression,
3500 = 28.2 × 0.449 × ∆T
3500 = 12.6618 × (T2 -T1)
T2 - T1 = 276.4220
T2 = 276.4220 K +293 K
T2 = 569.4220K
The temperature of the iron is approximately 570 K.
Thus, the final temperature of the iron in kelvins is 570K.
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What is the difference between an element and a compound? Give an example of each.
please answer in a sentence.
Answers
Answer:
An element is a single atom by itself found on the periodic table. A compound is made when two or more elements chemically bond together. An example of an element is hydrogen. (H) An example of a compound is \(H_{2} O\).
Explanation:
explained above
3.A chair will move by itself because of its inertia.True or False.
Answers
Answer:
false
Explanation:
Inertia is the resistance of any physical object to any change in its velocity, so it can't move by itself. Only by a different entity.
Answer: False
Explanation: In order to understand this, you need to understand what inertia means. In short, inertia is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
HELP ME ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!
Answers
Answer:
Digestive
Explanation:
Convert 35 joules into calories.
OR 1.410 cal
OC 82,500 cal
OD. 1.420,000 cal
Answers
Answer:
0.83Cal
Explanation:
Given parameters:
Amount of energy given;
35J;
Convert to Cal;
1 calorie = 42 joules
x calories = 35 joules
Cross multiply;
42x = 35
x = \(\frac{35}{42}\) = 0.83Cal
Elements that are shiny and are good conductors of electricity are:
a. Non-metals
b Metals
c. Halogens
d. Compounds
Answers
Answer:
Metals
Explanation:
Convert the following number from scientific notation to numerical notation:
9.9 x \(10^{7}\)
Answers
Reaction between silver nitrate and sodium chloride. A balanced chemical equation
Answers
Answer:
NaCl(aq) + AgNO3(aq) Sodium Silver chloride nitrate AgCl(s) + NaNO3(aq) Silver Sodium chloride nitrate
what is emprical evidence
Answers
Answer:
the correct answer is
Empirical evidence is the information received by means of the senses, particularly by observation and documentation of patterns and behavior through experimentation. The term comes from the Greek word for experience,
Explanation:
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46.0 g of barium nitrate is dissolved in 360 g of water. What is the percent concentration of the barium nitrate solute in the solution?
Pls help with answer I don’t get it
Answers
The percent concentration of the Barium nitrate : 11.33%
Further explanationThe concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
\(\tt \%mass=\dfrac{mass~solute}{mass~solution}\times 100\%\)
mass solute=mass Barium nitrate(Ba(NO₃)₂)=46 g
mass solvent=mass water=360 g
mass solution=mass solute+mass solvent=46+360=406 g
\(\tt \%mass=\dfrac{46}{406}\times 100\%\\\\\%mass=\boxed{\bold{11.33\%}}\)
I onlyI and II onlyII onlyII and III onlyI and III onlyIII only
Answers
The species that act as acid are the ones that donates H⁺ in the reaction.
Since we are working with an equilibrium, we have to consider both directions.
From left to right, we have H₂O turning into OH⁻ because it lost one H⁺, so H₂O is acting as an acid in the forward reaction.
From right to left, we have CH₃NH₃⁺ tunrning into CH₃NH₂ because it lost one H⁺, so CH₃NH₃⁺ is acting as an acid in the backwards reaction.
So, the species that act as acids are H₂O and CH₃NH₃⁺, I and II only.
These diagrams show two atoms of fluorine and an atom of magnesium.
On the left, a purple circle labeled F is shown twice, both times surrounded by 2 concentric circles. The inner circle has 2 small green spheres. The outer circle has 7 small green spheres. On the right, a purple circle labeled M g surrounded by 3 concentric circles. The inner circle has 2 small green spheres. The middle circle has 8 small green spheres. The outer circle has 1 small green sphere.
Which shows the correct steps in the formation of an ionic bond between these atoms?
A magnesium atom accepts six electrons from the fluorine atoms → Each fluorine atom donates three of the electrons → The magnesium atom becomes a -2 ion → Each fluorine atom becomes a +1 ion
A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a -2 ion → Each fluorine atom becomes a +1 ion
A magnesium atom accepts two electrons from the fluorine atoms → Each fluorine atom donates one of the electrons → The magnesium atom becomes a -2 ion → Each fluorine atom becomes a +1 ion
A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a +2 ion → Each fluorine atom becomes a -1 ion
Answers
Answer: D
Explanation:
took test
Answer:
D
Explanation:
got it right
Convert 2.55 moles of water to grams.
Answers
Explanation:
No of mass = no of moles × molar mass
=2.55 × 18 g
= 45.9 g
what is the coefficient for water after the equation is balanced?
Answers
Answer:
1
Explanation:
write the ionic equation for dissolution and the solubility product (ksp) expression for each of the following slightly soluble ionic compounds: (a) pbcl2 (b) ag2s (c) sr3(po4)2 (d) srso4
Answers
The ionic equation for dissolution and the solubility product (ksp) expression for each of the following slightly soluble ionic compounds.
(a) For PbCl2:
Dissolution: PbCl2 (s) → Pb²⁺ (aq) + 2Cl⁻ (aq)
Ionic equation: PbCl2 (s) ⇌ Pb²⁺ (aq) + 2Cl⁻ (aq)
Solubility product (Ksp) expression: Ksp = [Pb²⁺][Cl⁻]²
(b) For Ag2S:
Dissolution: Ag2S (s) → 2Ag⁺ (aq) + S²⁻ (aq)
Ionic equation: Ag2S (s) ⇌ 2Ag⁺ (aq) + S²⁻ (aq)
Solubility product (Ksp) expression: Ksp = [Ag⁺]²[S²⁻]
(c) For Sr3(PO4)2:
Dissolution: Sr3(PO4)2 (s) → 3Sr²⁺ (aq) + 2PO₄³⁻ (aq)
Ionic equation: Sr3(PO4)2 (s) ⇌ 3Sr²⁺ (aq) + 2PO₄³⁻ (aq)
Solubility product (Ksp) expression: Ksp = [Sr²⁺]³[PO₄³⁻]²
(d) For SrSO4:
Dissolution: SrSO4 (s) → Sr²⁺ (aq) + SO₄²⁻ (aq)
Ionic equation: SrSO4 (s) ⇌ Sr²⁺ (aq) + SO₄²⁻ (aq)
Solubility product (Ksp) expression: Ksp = [Sr²⁺][SO₄²⁻]
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We have two surfaces A and B where same amount of Force is acting. Area of Surface A is greater than Area of Surface B. which of the following will be true *
1 point
Pressure on Surface A > Pressure on Surface B
Pressure on Surface B > Pressure on Surface A
Pressure does not depend on area
Pressure on Surface A= Pressure on Surface B
Answers
Answer:
Pressure on Surface A > Pressure on Surface B
Explanation:
Pressu
re on Surface B > Pressure on Surface A