An unknown amount of water
was heated with 3.5 kJ, raising
its temperature from 26°C to
66°C. What was the mass of
the water?
Answer:
20.9grams
Explanation:
Using the formula:
Q = m × c × ∆T
Where;
Q = amount of heat (joules)
m = mass of substance (g)
c = specific heat of water (4.184 J/g°C)
∆T = change in temperature (°C)
According to the provided information;
Q = 3.5kJ = 3.5 × 1000 = 3500J
m = ?
c of water = 4.184 J/g°C
∆T = 66°C - 26°C = 40°C
Using Q = m × c × ∆T
m = Q ÷ (c × ∆T)
m = 3500 ÷ (4.184 × 40)
m = 3500 ÷ 167.36
m = 20.9
mass = 20.9grams
What are at least 3 pros of using solar energy ?
Answer:
Renewable Energy Source. Among all the benefits of solar panels, the most important thing is that solar energy is a truly renewable energy source
Reduces Electricity Bills
Diverse Applications
Explanation:
PLS HELP!! 40 POINTS (Absurd or Spam answers will be reported. No copying from other answers.)
Phases of Matter Activity
Now it is your turn to show what you know about phases of matter and thermal energy transfer! Your task is to create a presentation to explain the transformation of a substance as it changes phases. You may choose to write a story or create a comic strip. For your story or comic, you will create a main character and detail the adventure as your character is exposed to thermal energy, causing it to undergo phase changes from a solid, to a liquid, to a gas. You may create your own comic strip using drawings, presentation software, or this comic strip template.
Your presentation must include the following:
title and introduction of your character, including what substance the character is made of
source of thermal energy your character encountered (conduction, convection, and/or radiation)
detailed description and/or diagram of the particle transformation from solid to liquid phase
detailed description and/or diagram of the particle transformation from liquid to gas phase
You may get creative on this activity. If you are unsure if your idea or software for a presentation will work, contact your instructor for assistance. Be sure to review the grading rubric before you begin.
Answer:
lol i know this isnt the best but Your comic strip can be about how when you put smores in a campfire, the smores become burnt that is example of energy transfer because energy is traveling as heat to another object.
Explanation:
How are ionic bonds like magnets??
Answer:the opposite charge attracts like magnets
Explanation:
The ocean does NOT influencepur weather.
true or false
Answer:
True
Explanation:
A. What is the pH of 8.9 × 10−3 M HCl?
B. What is the pH of 8 × 10−8 M HCl?
Answer:
A. p(H) = 2.0506
B. p(H) = 7.0969
Explanation:
A.
p(H)= -log[H+]
p(H)= -log(8.9×10^-3)
p(H) = 2.0506
B.
p(H)= -log[H+]
p(H)= -log(8×10^-8)
p(H) = 7.0969
Which type of stress causes rocks to fold?
compression
shearing
strike-slip
tension
Answer:
tension
Explanation:
Which of the following is not part of the nucleus?
A. Ribosome
B. Chromosome
C. Nucleus
D. Gene
I believe the answer is Ribosome
A substance has a specific heat capacity of 2.0 J/g °C. How many joules are needed to raise the temperature of 30.0 g of this substance from 0°C to15°C?
a. 1 J
b. -1 J
c. -900 J
d. 900 J
Answer:
g
Explanation:
know what you think about th can get it
Answer:
[tex]\Large \boxed{\sf 900 \ J}[/tex]
Explanation:
Use formula
[tex]\displaystyle \sf Energy\ (J)=mass \ (g) \times specific \ heat \ capacity \ (Jg^{-1}\°C^{-1}) \times change \ in \ temperature \ (\°C)[/tex]
Substitute the values in formula and evaluate
[tex]\displaystyle \sf Energy\ (J)=30.0\ g \times 2.0 \ Jg^{-1}\°C^{-1} \times (15\°C-0\°C)[/tex]
[tex]\displaystyle Q=30.0 \times 2.0 \times (15-0 )=900[/tex]
Plz answer ASAP
At what point during the digestive process does your body begin to receive energy from the food?
Answer:
this should help *not a virus
Explanation:
https://kidshealth.org/en/teens/digestive-system.html
5. A sample of pure acetyl salicylic acid had a mass of 0.268 grams. It was dissolved in NaOH and diluted to 500.00mL in a volumetric flask.
a. What is the concentration of aspirin in the solution?
b. If an 8.00mL sample of this solution was pipetted into a volumetric flask and diluted to 100.00mL, what is the concentrated of aspirin after this dilution?
Answer:
a. 5.36x10⁻⁴ g/mL
b. 4.29x10⁻⁵ g/mL
Explanation:
As the units for concentration are not specified, I'll respond using g/mL.
a. We divide the sample mass by the final volume in order to calculate the concentration:
0.268 g / 500 mL = 5.36x10⁻⁴ g/mLb. We can use C₁V₁=C₂V₂ for this question:
8.00 mL * 5.36x10⁻⁴ g/mL = C₂ * 100.00 mL C₂ = 4.29x10⁻⁵ g/mLWhat does pcv means in medical terms
Answer:
packed-cell volume
Explanation:
A chemist needs to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solution. He has a 0.1071 M standard sodium hydroxide solution. He takes a 25.00 mL sample of the original acid solution and dilutes it to 250.0 mL. Then, he takes a 10.00 mL sample of the dilute acid solution and titrates it with the standard solution. The endpoint was reached after the addition of 12.69 mL of the standard solution. What is the concentration of the original sulfuric acid solution?
Answer:
The way the chemist works is through the chemistry of astronomical events in the atmosphere of delocalisation which causes a significant impact on Kanye West which ellaborates the terrific police of the UK. And thats why me and Jennifer Lopez share the same hair band.
Carbon dioxide and water react to form methanol and oxygen, like this:
2CO2(g) + 4H2O(g) → 2CH3OH(l) + 3O2 (g)
At a certain temperature, a chemist finds that a 7.5L reaction vessel containing a mixture of carbon dioxide, water, methanol, and oxygen at equilibrium has the following composition:
Compound Amount
CO2 3.28g
H2O 3.86g
CH3OH 1.51g
O2 2.80g
Required:
Calculate the value of the equilibrium constant Kc for this reaction. Round your answer to 2 significant digits.
Answer:
24x10³
Explanation:
2CO₂(g) + 4H₂O(g) → 2CH₃OH(l) + 3O₂ (g)
The equilibrium constant for this reaction is:
Kc = [tex]\frac{[O_2]^3}{[CO_2]^2[H_2O]^4}[/tex]
The expression of [CH₃OH] is left out as it is a pure liquid.
Now we convert the given masses of the relevant species into moles, using their respective molar masses:
CO₂ ⇒ 3.28 g ÷ 44 g/mol = 0.0745 mol CO₂H₂O ⇒ 3.86 g ÷ 18 g/mol = 0.214 mol H₂OO₂ ⇒ 2.80 g ÷ 32 g/mol = 0.0875 mol O₂Then we calculate the concentrations:
[CO₂] = 0.0745 mol / 7.5 L = 0.0099 M[H₂O] = 0.214 mol / 7.5 L = 0.0285 M[O₂] = 0.0875 mol / 7.5 L = 0.0117 MFinally we calculate Kc:
Kc = [tex]\frac{0.0117^3}{0.0099^2*0.0285^4}[/tex] = 24x10³What is the reaction when you take hydrogen gas and oxygen gas to form liquid hydrogen peroxide
Answer:
Hydrogen gas (H2) and oxygen gas (O2) react to form liquid hydrogen peroxide (H2O2). The atoms of the reactants have combined to form a new substance. The new substance has its own set of properties that is different from the properties of each reactant.
Explanation:
10
Which of the following statements best explains how heat flows by
conduction?
A large mass of warm air rises, replacing the cooler air above
Energy is transferred by electromagnetic waves.
A large mass of air begins to move faster.
Energy is transferred from direct contact between two objects.
Sunlight warms an area of Earth's surface. Winds then carry thermal energy 1 po
I need help on this question on reaction enthalpy kJ
Answer:
-34kJ
Explanation:
Reverse first reaction: -68kJ
Divide by 2: -68/2 = -34kJ
_HNO3+ Fe+2
2+ H+ +_NO+ Fe+3+ H2O
What is the coefficient for water after the equation is balanced?
Answer: The coefficient for water after the equation is balanced is 2.
Explanation:
The balanced chemical equation must have same charge and same number of atoms on both sides of the equation.
As the given reaction is a redox recation occuring in acidic medium.
[tex]HNO_3+3Fe^{2+}+3H^+\rightarrow NO+3Fe^{3+}+2H_2O[/tex]
The coefficient for water will be 2 after the equation is balanced.
All of these are examples of things that produce light energy except.
a. candle
b.flashlight
cDesklamp
d.compass
Answer:
Explanation:
A compass. Its main purpose is to tell what direction you are travelling.
Acetic acid and water react to form hydronium cation and acetate anion, like this:
HCH3CO2(aq) + H2O(l) → H3O^+ (aq) + CH3CO2^-(aq)
Imagine 226. mmol of CH3CO2- are added to a flask containing a mixture of HCH3CO2, H2O, H3O and CH3CO2- at equilibrium, and then answer the following question.
What is the rate of the reverse reaction before any CH3CO2^- has been added to the flask?
Answer:
The answer is "Greater than zero, and greater than the rate of the reverse reaction".
Explanation:
It applies a rate of reaction to the balance, a forward response dominates until it reaches a constant. This process is balanced before 52 mmol of the reactant[tex]HC H_{3} \ CO_2[/tex], to which 3 is added. In balance, that rate of the forward reaction was its rate with forwarding reaction, both of which are higher than 0 as the response has achieved balance so that both species get a level greater than 0.
Rank the following compounds in order of decreasing acid strength using periodic trends. Rank the acids from strongest to weakest.
a. HCl
b. H2S
c. HBr
d. BH3
Answer:
HBr > HCl > H2S > BH3
Explanation:
In many acids, the magnitude of electronegativity of the nonmetal determines the strength of the acid. The less electronegative the non-metal is, the stronger the acidity of the acid.
This is because the less electronegative the nonmetal is, the more easily the H-X bond is broken since it is longer and weaker.
This explains the order of acid strength shown in the answer above.
what volume of nitrogen gas is equal too 3.42x10^22 molecules of this substance
if i am correct the volume of nitrogen gas has to equal to molecules density, making the substance 1.27 liters :)
The blue colour of the sky results from the scattering of sunlight by air molecules. Blue light has a frequency if about 7.5*10^14Hz
Calculate the energy of a mole of photon associated with this frequency
Answer: The energy of a mole of photon associated with this frequency is [tex]49.5\times 10^{-20}J[/tex]
Explanation:
The energy and frequency are related by :
[tex]E=N\times h\times \nu[/tex]
E = energy of photon
N = number of moles = 1
h = planks constant = [tex]6.6\times 10^{-34}Js[/tex]
[tex]\nu[/tex] = frequency = [tex]7.5\times 10^{14}Hz[/tex]
[tex]E=1\times 6.6\times 10^{-34}Js\times 7.5\times 10^{14}s^{-1}=49.5\times 10^{-20}J[/tex]
The energy of a mole of photon associated with this frequency is [tex]49.5\times 10^{-20}J[/tex]
3
Carl's baseball team is selling
trash bags to raise money for
uniforms and equipment. Each
player starts with a credit of $50
towards their sales, and each roll of
trash bags sells for $8. Determine
how many rolls of trash bags each
person must sell to make $300.
31 rolls of trash bags
Answer:
300 divide by 8 is equals to 37.5
what is the gram of hydrogen in periodic table?
Answer:
This is your answer
Hope it helps!!!
In the following reactions identify which substances are solid (s) or aqueous (aq). 1. Li,SO4( aq ) + MgCl, ( aq ) - 2LICI ( 2LICI ( ) + Mgso( ) I 2. AgNO3 ( ) + Na, S( ) ► Ag,s ( ) + Nanoz ( ) 3. Nano, ( ) + KCI ( ) = Naci ( ) + KNO,( ) Which reaction above would be difficult to see if anything occurred and why?
Answer:
Ok
Explanation:
A first order reaction B=C has a half life of
20 minutes. What percentage shall have reacted
after 47 minutes?
Answer:
90.46 well that's how I got the answer from my calculations
How much heat must be added to heat 0.750 g of water from 20.0 degrees * C to 40.0C (Remember, Q=C*m* Delta T) The specific heat of water is joule/gram.
D. 62.8 J
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Thermodynamics
Specific Heat Formula: q = mcΔT
q is heat (in joules)m is mass (in grams)c is specific heat (in J/g °C or J/g K)ΔT is change in temperature, final minus initial (°C or K)Explanation:Step 1: Define
[Given] m = 0.750 g
[Given] c = 4.186 J/g °C
[Given] ΔT = 40.0 °C - 20.0 °C = 20.0 °C
[Solve] q
Step 2: Solve
Substitute in variables [Specific Heat Formula]: q = (0.750 g)(4.186 J/g °C)(20.0 °C)[Heat] Multiply [Cancel out units]: q = 62.79 JStep 3: Check
Follow sig fig rules and round. We are given 3 sig figs.
62.79 J ≈ 62.8 J
please help. thank youuuu
Determine the [OH−] , pH, and pOH of a solution with a [H+] of 9.5×10−13 M at 25 °C.
Determine the [H+] , pH, and pOH of a solution with an [OH−] of 9.4×10−6 M at 25 °C.
Determine the [H+] , [OH−] , and pOH of a solution with a pH of 5.37 at 25 °C.
Determine the [H+] , [OH−] , and pH of a solution with a pOH of 9.63 at 25 °C.
Answer:
'See Explanation
Explanation:
Determine the [OH−] , pH, and pOH of a solution with a [H+] of 9.5×10−13 M at 25 °C.
Given [H⁺] = 9.5 x 10⁻¹³M => [H⁺][OH⁻] = 1.0 x 10⁻¹⁴ => [OH⁻] = 1.0 x 10⁻¹⁴/9.5 x 10⁻¹³ = 0.0105M
pH = -log[H⁺] = -log(9.5 x 10⁻¹³) = - (-1202) = 12.02.
pOH = -log[OH⁻] = -log(0.0105) = -(-1.98) = 1.98
Now you use the same sequence in the remaining problems.
Respiration takes place in:
O only plants
O only animals
O both plants and animals
Answer:
both
Explanation:
plants have mitochondria and can preform cellular respiration
animals and plants use oxygen in respiration to produce corbon dioxide
Answer:
I think it's both.
Explanation:
I just looked it up, so yeah.