Answer:
Drycell and car battery
Explanation:
Is it only one answer because I think both of these are redox reactions.
The average adult heart pumps about 84./mLs of blood at 72 beats per minute. Suppose you need to calculate how long it would take the average heart to circulate 1700.mL of blood. Set the math up.
Answer:
1700 mL / 84 mLs
Explanation:
Given that:
Volume of blood pumped per minute = 84 /mLs
Time it takes to circulate 1700 mL of blood :
Time taken = Volume of blood circulate / Rate
Hence, to circulate 1700 mL of blood :
Time taken = 1700 mL / 84 mLs
I NEED HALPPPPPP PLEASE
Question 1 options:
instant tea
water
Question 2 options:
instant tea
water
Question 3 options:
mixture
solution
question 1 water question 2 instant tea question 3 mixture
dicotyledonous plants
The dicotyledons, also known as dicots, are one of the two groups into which all the flowering plants or angiosperms were formerly divided. The name refers to one of the typical characteristics of the group, namely that the seed has two embryonic leaves or cotyledons.
A chemistry student is given 700. mL of a clear aqueous solution at 26.° C. He is told an unknown amount of a certain compound X is dissolved in the solution. The student allows the solution to cool to 26.° C. The solution remains clear. He then evaporates all of the water under vacuum. A precipitate remains. The student washes, dries and weighs the precipitate. It weighs 0.032 kg.
Required:
Using only the information above, can you calculate the solubility of X in water at 22.0°C ? If you said yes, calculate it. Be sure your answer has a unit symbol and 2 significant digits.
Answer:
The correct answer is - yes, 4.57 g of solute per 100 ml of solution
Explanation:
The correct answer is yes we can calculate the solubility of X in the water at 22.0°C. The salt will remain after the evaporate from the dissolved and cooled down at 26°C.
Then, the amount of solute dissolved in the 700 ml solution at 26°C is the weighed precipitate: 0.032 kg = 32 g.
Then solublity will be :
32. g solute / 700 ml solution = y / 100 ml solution
⇒ y = 32. g solute × 100 ml solution / 700 ml solution = 4.57 g.
Thus, the answer is 4.57 g of solute per 100 ml of solution.
The following conditions must be met before a standard calibration curve equation can be used to solve for the concentration of an unknown solution:
a. The same instrument must be used to measure the unknown solution as was used to measure the known (standard) solutions that were used to create the calibration curve.
b. The analyte in the unknown solution must be the same analyte (or type of analyte) that is present in the known (standard) solutions that were used to create the calibration curve.
c. The equation from the calibration curve can only be linear.
d. Domain and range restrictions must be observed.
Answer:
The same instrument must be used to measure the unknown solution as was used to measure the known (standard) solutions that were used to create the calibration curve.
The analyte in the unknown solution must be the same analyte (or type of analyte) that is present in the known (standard) solutions that were used to create the calibration curve.
Domain and range restrictions must be observed.
Explanation:
Calibration curves are tools necessary in understanding the instrumental response for any analyte.
A calibration curve is obtained by preparing a set of standard solutions with known concentrations of the analyte. The instrument response for each concentration is measured and plotted against the concentration of the standard solution. The linear portion of this plot may be used to determine the unknown concentration of a sample of the analyte.
The equation of the best-fit line is used to determine the concentration of the unknown sample.
Can someone please help me with this I’ll mark brainliest, in the boxes below label what level of organization might look like?
Answer:
Vascular tissue transports water, minerals, and sugars to different parts of the plant. Vascular tissue is made of two specialized conducting tissues: xylem and phloem. Xylem tissue transports water and nutrients from the roots to different parts of the plant, and also plays a role in structural support in the stem.
Explanation:
HOPE THIS HELPS!
HELPPPPPPPPPPPPPPPPPPPPPP PLZ
While cleaning my room, I use 5 Newtons of force to lift a board game from the floor to the shelf in my closet that's 2 meters high. How much work was done on the board game?
10 Joules
10 Watts
2.5 Watts
2.5 Joules
10 joules
hope that helps^^
Answer:
10 joules im not sure tho
A chemical supply company sells sulfuric acid
(H2SO4) in a concentration of 4.00 M. What
volume of this solution would you need to make
12.0 mL of a 0.50 M H2SO4 solution?
Which equation should you use?
Answer:
A.
1.5
B
Explanation:
2H2(g)+O2(g)→2H2O(l)
What is the mass of water, H2O(l) , produced when 5.70 g of O2(g) reacts with excess H2(g)?
Answer:
6.4g
Explanation:
32g of O2 produce 36g of H2O/5.70g of O2 produce x the answer is 6.4g
How many CaF are in a 1.7x10^25 please I need help fast!!
28 mol CaF
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 1.7 × 10²⁵ molecules CaF
[Solve] moles CaF
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 1.7 \cdot 10^{25} \ molecules \ CaF(\frac{1 \ mol \ CaF}{6.022 \cdot 10^{23} \ molecules \ CaF})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 28.2298 \ moles \ CaF[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
28.2298 mol CaF ≈ 28 mol CaF
When a baseball bat hits a baseball, what happens to the energy?
completo ancur
Answer: the baseball bat transfor its energy in the ball.
Explanation: you hit it with one and find out and tell me what you think what happen.
An FCC iron-carbon alloy initially containing 0.20 wt% C is carburized at an elevated temperature and in an atmosphere wherein the surface carbon concentration is maintained at 1.0 wt%. If after 48 h the concentration of carbon is 0.35 wt% at a position 3.9 mm below the surface, determine the temperature at which the treatment was carried out. You will need to use data in the two tables below to solve this problem.
Answer:
Hello the table required is missing attached below is the missing table
Answer : 1299.05 k
Explanation:
Given data :
concentration of carbon ( Cx ) at a position 3.9mm below surface = 0.35
concentration of carbon ( Co ) = 0.20
surface carbon ( Cs ) = 1
Determine the temperature at which the treatment was carried out
first we will determine the value of Z in the table attached
given that the value of erf ( Z ) for Z = 0.8125 from the table
= [tex]\frac{Z- 0.9}{0.95-0.9} = \frac{0.8125-0.797}{0.8209-0.797}[/tex]
make Z subject of the equation
Z = 0.932
next calculate the diffusion coefficient using the relation below
Z = [tex]\frac{x}{2\sqrt{Dt} }[/tex] ----- ( 1 ) where ; z = 0.932 , x = 3.9 mm , t = 48h
0.932 =
x = 3.9 mm = 0.0039 m
t = 48 h = ( 48 *60* 60 ) = 172800 secs
Insert values into equation 2
0.932 = [tex]\frac{0.0039}{2\sqrt{D * 172800} }[/tex]
[tex]\sqrt{D*172800}[/tex] = (0.0039 / 0.932 ) / 2
172800 * D =( 0.0021 )^2
therefore D = 2.55 * 10^-11 m^2/s
Finally calculate the temperature at which the treatment was carried out
D = [tex]Do exp(\frac{-Qd}{RT} )[/tex] ----- ( 3 )
D = 2.55 * 10^-11 m^2/s ,
Do = 2.3*10^-5 m^2/s ( gotten from Diffusion data table )
Qd = 148000 J/mol ( gotten from Diffusion data table )
R = 8.31 J/mol k ( gotten from Diffusion data table )
back to equation 3
D / Do = exp ( -17810 / T )
1.11 * 10^-6 = exp ( -17810 / T )
therefore T = -17810 / ln( 1.11 * 10^-6 )
= - 17810 / -13.71 = 1299.05 k
By definition, a(n) _______acid is any species that can donate a proton. Ammonia has a proton bonded to nitrogen, so ammonia can be an base (although a very weak one). A(n)___________ base is a proton acceptor, that is, it must have a pair of electrons to share with a proton. In theory, any atom with an unshared electron pair can be a________ pair so ammonia is a_______ proton; instead, it acts as a base and pulls a proton from water to a small extent. base The nitrogen in ammonia has an unshared electron In water, ammonia is too weak an ______-to give up its
Answer:
A Brønsted-Lowry acid.
A Brønsted-Lowry base.
Ammonia is an acceptor of proton.
Explanation:
A Brønsted-Lowry acid is any atom that can donate a proton (H +) to another atom or molecule whereas Brønsted-Lowry base is any species that can accept a proton from another atom or molecule or in other words, a Brønsted-Lowry acid is a proton donor, while on the other hand, a Brønsted-Lowry base is a proton acceptor. The ammonia molecule accepts the hydrogen ion is considered as the Brønsted-Lowry base.
100
Continue reflecting on managing the effects of tropical cyclones by a
the phrases below:
I have learned that the Philippine Area of Responsibility
The Philippine Atmospheric, Geophysical, and Astronomical Services Administration
The Philippines is prone to typhoons because
You can trace the path of typhoons using
You will then understand that landmasses and bodies of
water affect the intensity of typhoons causing it to increase when
and decrease when
We should stay informed about the weather. Public Storm Warning Signals indicate
The higher the PSWS, the
the damage felt. Hazards that may
accompany tropical cyclones are
But tropical cyclones also have benefits, such as
Great work! Now that you know more about the effect of typhoons, you can
ssen the damages by knowing what to do. Answer the next activity, to eva
nowledge on precautionary measures to lessen the risk brought about by
10
Answer:
?????
Explanation:
...? what...?
Which is mainly responsible for preventing erosion?
A) Mining
B) Farming
c) Rooting of Plants
D) Logging
Answer:
B. Farming
Explanation:
An ionic compound and a covalent compound are dissolved in separate beakers of H2O. Which solution will conduct an electric current?
Answer:
ionic compound
Explanation:
An ionic compound and a covalent compound react differently when dissolved in water (H2O).
The ionic compounds when dissolved in H2O, undergo a physical change called dissociation. In this change the molecules of water surround the ionic compound and ions of ionic compound disperse uniformly in the water. The complete dissociation of ionic compounds in H2O makes it a strong electrolyte and solution will conduct an electric current.
Some of the covalent compounds also conduct electricity as when they dissolve in H2O, the molecule of covalent compound react chemically with the solvent to produce ions. Generally, covalent compounds are weak electrolytes and do not conduct much electricity as ionic compounds but exception are their such as HCl and benzene.
Each polysaccharide tested gives different color results with the iodine test
Read: https://kids.britannica.com/kids/article/DNA/390730 (Links to an external site.)
Answer the following questions:
1. What sort of things does DNA determine for a creature? (Think physical traits)
2. Sometimes there are mistakes in DNA, what are these mistakes called? what sort of things can these mistakes cause?
3. What makes up the sides of the DNA structure?
4. There are four different bases in DNA: adenine, thymine, guanine, and cytosine. About how many total pairs do humans have in their DNA?
Answer:
im not doing your whole homework. but ill give you one cent ;>, whats ur paypal
Explanation:
What is the scientific name of hydrogen -2 and hydrogen -3.
Answer:
Hydrogen 2 is called deuterium, Hydrogen 3 is called Tritium
Explanation:
Hydrogen is the only element whose isotopes have different names in common use today: the 2H (or hydrogen-2) isotope is deuterium and the 3H (or hydrogen-3) isotope is tritium.
Judy's brand new Lamborghini car travels 280 km in 4 hours. What is its average speed?
A 32.4 L gas sample at STP is compressed to a volume of 28.4 L, and the temperature is increased to 352 K. What is the new pressure of the gas in atmospheres
Answer:
1.47 atm
Explanation:
Step 1: Given data
Initial volume (V₁): 32.4 LInitial pressure (P₁): 1 atm (standard pressure)Initial temperature (T₁): 273 K (standard temperature)Final volume (V₂): 28.4 LFinal pressure (P₂): ?Final temperature (T₂): 352 KStep 2: Calculate the final pressure of the gas
We can calculate the final pressure of the gas using the combined gas law.
P₁ × V₁ / T₁ = P₂ × V₂ / T₂
P₂ = P₁ × V₁ × T₂ / T₁ × V₂
P₂ = 1 atm × 32.4 L × 352 K / 273 K × 28.4 L = 1.47 atm
Plz help it over science stuff
Which of the following destroys the marine ecosystem?
A. fishpond C. dynamite fishing
B. reclamation D. constructing man-made sanctuaries
Answer:
The correct one is dynamite fishing
Find the molecular mass of
MgSO4 7H₂O.
Answer:
MgO +H2SO4
Explanation:
use photomath
How many moles of N2 is 25.92g of N2?
Explanation:
number of moles = mass /relative molecular mass
n = 25,92/mr(N2)
n=25,92/14×2
n=25,92/28
n=0.93moles
What do atoms make up
I need help answering number 14 A B and C. Thank you!
Answer:
Explanation:
TiO2 + C + 2 CI2 → TiCI4 + CO2
(a)
(2.16 mol TiO2) x (2 mol CI2 / 1 mol TiO2) x ( 70.9064 g C/mol) = 306 g CI2
(b)
(2.16 mol TIO2) x (1 mol C / 1 mol TiO2) x ( 12.01078 g C/mol)n= 25.9 g C
(c)
Use the law of conservation of mass:
(2.16 mol TiO2) x ( 79.8660 g TiO2/mol) + (306 g CI2 + 25.9 g C = 504 g total.
Hope this help!:)
How many atoms are in phosgene
Answer:
3 atoms
Explanation:
there is one calcium and two chlorine
Suppose you perform a calorimeter experiment to determine the molar heat of neutralization of an unknown acid, H A HA, with sodium hydroxide, N a O H NaOH. You mix 37.2 mL of 0.50 M H A HA with 56.8 mL of 0.75 M N a O H NaOH and calculate the heat of reaction as -1.6 kJ. What is the molar heat of neutralization (in kJ/mol) for the unknown acid
Answer:
-86.02 kJ/ mole
Explanation:
The moles of the acid used = Molarity × Volume (L) =
= 0.50 (0.0372 L)
= 0.0186 moles
The heat released = -1.6 kJ
∴ 0.0186 moles neutralization of HA heat is: -1.6 kJ
The molar heat of neutralization due to one mole of the unknown acid = -1.6/0.0186
= -86.02 kJ/ mole
The molar heat of neutralization for the unknown acid is -86.02 kJ/ mole.
How to calculate Moles?The moles of the acid used = Molarity × Volume (L) =
= 0.50 (0.0372 L)
= 0.0186 moles
Thus, the moles of the acid used is 0.0186.
The heat released = -1.6 kJ
Thus, 0.0186 moles neutralization of HA heat is: -1.6 kJ
Molar heat of Neutralization: It is the amount of heat each mole of base added to the acid (or vice versa) causes the reaction to give off.
The molar heat of neutralization due to one mole of the unknown acid = [tex]\frac{-1.6}{0.0186}=-86.02kJ/mole[/tex]
So, the molar heat of neutralization is -86.02kJ/mole.
Find more information about Moles here:
brainly.com/question/13314627
You need to produce a buffer solution that has a pH of 4.97. You already have a solution that contains 10. mmol (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acetic acid) will you need to add to this solution?
Answer:
16.9 mmoles are needed to add to the solution
Explanation:
To solve this, we can apply the Henderson Hasselbach equation:
Acetic acid → CH₃COOH
CH₃COOH + H₂O ⇄ CH₃COO⁻ + H₃O⁺ Ka
That is the acid base equilibrium, to determine the amount:
pKa of acetic acid is 4.74
Henderson Hasselbach formula is:
pH = pKa + log (base/acid)
We replace → 4.97 = 4.74 + log (B / 10mmoles)
Let's verify mmoles of B
4.97 - 4.74 = log (B/10)
0.23 = log (B/10)
10^(0.23) = 10^(log (B/10)
1.698 = B/10
B = 1.698 . 10 → 16.9 mmoles
