Answer:
hiiiiiiiiiiiiiiiiiiiiiiiiii
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
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
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 are ionic bonds like magnets??
Answer:the opposite charge attracts like magnets
Explanation:
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]
does Al3+ gain or loose electrons?
Answer:
gain
Explanation:
Which describes how atoms form molecules.An atom is to a molecule as
A. A letter is to a word
B. A cat is to a mouse
C. A spoon is to the soup
D. A book is to a page
Photosynthesis cannot happen without:
O light
O chlorophyll
O carbon dioxide
O all of the above
O none of the above
All of the above — plants need light, chlorophyll, and carbon dioxide to perform photosynthesis, a chemical reaction producing glucose (which provides energy for the plant.)
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 :)
what is the bromothymol blue of lemon?
[tex]\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the Litmus paper and pH indications.
Since the Litmus paper and Artificial indicators are used to check the pH of any solution.
=> If a substance is Acidic, its pH range is less than 7 , and the colour are generally red, yellow, orange and hot shades.
=> If a substance is Basic, it's pH range is more than 7 , and the colors are generally Cool shades like, blue, violet, green, etc.
==> In the lemon juice experiment, the pH paper turns from blue to vivid red, indicating the presence of H3O+ ions: lemon juice is acidic. Refer to the table of Universal Indicator Color change for clarification.
A balloon is floating around outside your window. The temperature outside is -1 °C, and the air pressure is 0.800 atm. Your neighbor, who released the
balloon, tells you that he filled it with 5.00 moles of gas. What is the volume of gas inside this balloon?
Express your answer to three significant figures and include the appropriate units.
View Available Hint(s)
HA
?
Vballoon
Value
Units
Submit
Part B
A 14.0 L gas cylinder is filled with 5.00 moles of gas. The tank is stored at 7 °C. What is the pressure in the tank?
Express your answer to three significant figures and include the appropriate units.
View Available Hint(s)
Answer:
140 L (3 sig-figs; includes the zero)*
Explanation:
PV = nRT => V = nRT/P
P = 0.800atm
V = ?
n = 5 moles
R =0.08206 L·atm/mol·K
T = -1°C = (-1 + 273)K = 272K
V = nRT/P = (5mol)(0.08206 L·atm/mol·K)(272K)/(0.800atm) = 139.5 L
*=> 140 Liters (3 sig-figs) => zero is a sig-fig b/c it was result of rounding 139.5 Liters to obtain 140 Liters.
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:
Determine whether each of the following salts will form a solution that is acidic, basic, or pH-neutral.
a. KCl
b. NaClO
c. Al(ClO4)3
d. NH4Cl
e. C5H5NHF
f. NaBr
g. Ca(NO2)2
Answer:
a) Neutral
b) Basic
c) Acidic
d) Acidic
e) Basic
f) Neutral
g)
Explanation:
a) KCl is a neutral salt because K ion in solution form produces both acid and base (KOH)
b) NaClO produces basic solution because ClO− is the conjugate base of a weak acid
c) Al(ClO4)3 will produce acidic solution because ClO4 is component of strong acid
d) NH4Cl will produce acidic solution because NH4+ ion is a strong conjugate acid of the weak base and Cl- is a weak conjugate base of the strong acid
e) Basic
f) Neutral salt
g) Acidic
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.
What 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:
when ammonium nitrate is found at a fire scene, it may undergo thermal decomposition producing which materials?
Answer:
nitrous oxide
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:
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.
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.
What is 17647.05882 rounded to 2 significant figures?
Which type of material incorporates a variety of substances to enhance desired properties such as strength and flexibility?
Answer:
its a polymer
Explanation:
MOLECULES SPEED UP WHEN ENERGY IS CREATED AND SLOW DOWN WHEN ENERGY IS DESTROYED true or false
What does pcv means in medical terms
Answer:
packed-cell volume
Explanation:
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/mLRank 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.
HELP I HAVE NO TIME LEFT
Answer:
Top question is B
Bottom question is A
Explanation:
Answer:
top answer : B. intrusive igneous rock
bottom answer : A. extrusive igneous rock
Hope this helps!
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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.
NEED HELP ASAP FREE BRAINLIST
Answer:
7) C. Sodium
8) G. 1 valence electron
Explanation:
The ocean does NOT influencepur weather.
true or false
Answer:
True
Explanation:
how are atoms an example of unity?
A. All atoms have the same arrangement of electrons.
B. All atoms react with other atoms the same way.
C. All atoms of one kind share common properties.
D. All atoms have the same number of neutrons.
Answer: C. All atoms of one kind share common properties.
Explanation: