Answer:
I would say the 2nd one It helps growth and repair of cells of orgasmsBut your school would probably say the 3rd one It helps remove toxins from the body to maintain homeostasisExplanation:
2. Our cells produce a lot of waste that must be eliminated (excreted) from the body. These residues are called excreta. The residues formed from the chemical reactions that take place inside the cells can be eliminated through:
• of the respiratory system (carbon dioxide)
• skin (sweat)
urinary system (urine)
Our cells expel these substances to maintain the dynamic balance (homeostasis) of our body and promote our well-being.
Cream of tartar, a common ingredient in cooking, is the common name for potassium bitartrate (abbreviated KBT, molar mass 188.2 g/mol). Historically, KBT was a crystalline solid that formed on the casks of wine barrels during the fermentation process. Calculate the maximum mass of KBT that can dissolve in 280. mL of solution to make a saturated solution. KBT dissolves to form the potassium ion (K+) and the bitartrate ion (abbreviated as BT-).
KBT(s) → K+(aq) + BT-(aq) Ksp = 3.8×10-4
Answer:
0.288g KBT can be dissolved
Explanation:
The dissolution of KBT produce the dissociation in K⁺ and BT⁻ ions as follows:
KBT(s) → K+(aq) + BT-(aq) Ksp = 3.8×10-4
Where Ksp is defined as:
Ksp = 3.8x10⁻⁴ = [K⁺][BT⁻]
Thus, we need to find the concentration of KBT that can be dissolved = [K⁺] = [BT⁻]:
3.8x10⁻⁴ = [K⁺][BT⁻]
3.8x10⁻⁴ = [KBT][KBT]
3.8x10⁻⁴ = [KBT]²
0.01949M = [KBT]
In 280mL = 0.280L, the moles of KBT that can be dissolved are:
0.01949mol / L * 0.280L =
5.458x10⁻³ moles of KBT. In grams (Using molar mass):
5.458x10⁻³ moles of KBT * (188.2g/mol) =
0.288g KBT can be dissolvedUsing the following equation: 3H2SO4 + 2Fe - +Fe2(SO4)3 + 3H2
How many moles of H2SO4 will react with 8 moles of Fe?
Answer:
12 moles of H₂SO₄
Explanation:
The reaction equation is given as;
3H₂SO₄ + 2Fe⁻ → Fe₂(SO₄)₃ + 3H₂
From the balanced reaction equation:
Number of moles of Fe = 8moles
So;
2 mole of Fe will react with 3 moles of H₂SO₄
8 moles of Fe will therefore yield [tex]\frac{8 x 3}{2}[/tex] = 12 moles of H₂SO₄
How could solar flares affect the Earth's communication?
Answer:Solar flares have been known to affect electronic communication because their energy stirs up the Earth's upper atmosphere.
Explanation:
which statement best describes the process of photosynthesis
A. it is the process of producing fruits. B. it is the process of relesing carbon dioxide C.it is the process of converting energy and producing and producing food D.it is the process of absorbing water and releasing nitrogen.
the most reactive metal elements is group __
Answer:
The most reactive metal elements is Group 1.
Be sure to answer all parts.
A slice of cheese has a mass of 67 g and a volume of 35 cm'. What is the density of the cheese in units of
g/cm² and g/mL?
Answer:
d = 1.91 g/cm³
d = 1.91 g/mL
Explanation:
Given data:
Mass of cheese = 67 g
Volume of cheese = 35 cm³
Density of cheese = ?
Solution:
Formula:
d = m/v
by putting values,
d = 67 g/ 35 cm³
d = 1.91 g/cm³
1cm³ = 1mL
d = 1.91 g/mL
PLEASEEE HELP ;C
Write the following elements in decreasing order of atomic radius. Li, Cs, K, Rb
How are humidity and relative humidity different?
Relative humidity is the percentage of what it can hold. Humidity is the measure of the amount of water vapor it can hold.
hope this helps ^^
2. A quantity of 1.922g of methanol (CH3OH) was burned in a constant-volume
bomb calorimeter. Consequently the temperature of the water rose by 4.20C.
If the heat capacity of the bomb plus water was 10.4KJ/C, calculate the molar
heat of combustion of methanol.
These are not able to conduct electricity or heat very well, very brittle (breakable), and cannot be
made into wires or pounded into sheets
Answer:
Nonmetals
Explanation:
Nonmetals typically lacks the metallic bonding which allows substances to exhibit metallic properties that confers special properties on them.
Metals are malleable and ductileThey are also able to conduct electricity due to the sea of electrons present within their structure. Metals can be made into wire and drawn into sheets.Nonmetals lacks these properties but metalloids are able to show some of the properties under certain and special conditions.
Which topic is commonly used to explain activation energy and how chemical reactions happen?
collision theory
Explanation:
Collision theory, theory used to predict the rates of chemical reactions, particularly for gases. The collision theory is based on the assumption that for a reaction to occur it is necessary for the reacting species (atoms or molecules) to come together or collide with one another.
HELP PLEASE
convert 2.45 • 10^21 formula unit of ammonium sulfate to moles
Answer:
0.0041 mol
Explanation:
Given data:
Number of formula units = 2.45 × 10²¹ formula units
Number of moles = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions ,formula units and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ formula units
2.45 × 10²¹ formula units × 1 mol / 6.022 × 10²³ formula units
0.41 × 10⁻² mol
0.0041 mol
Explain oscillation
Pls help ty!
Answer:regular variation in magnitude or position around a central point. Or movement back and forth at a regular speed
Explanation:
Answer:
movement back and forth at a regular speed
Explanation:
they be oscillatin
Iron reacts with oxygen to produce iron oxide rust this reaction is representative in an equation as to FE plus XO22FE203 identify the value of X that will balance this equation
The balanced equation :
4Fe + 3O₂⇒ 2Fe₂O₃
Further explanationGiven
Rust reaction
Required
Balanced equation
Solution
Reaction
Fe + O₂⇒ 2Fe₂O₃
For a simple equation where one of the reaction coefficients is known, we can immediately add the corresponding coefficient using the principle that the number of atoms of the components in the reactants and products is the same.
In the above reaction :
Fe, left=1, right = 4, so coefficient in the left=4
O, left=2, right = 6, so coefficient in the left=3
choose all the following that are properties of gases
Answer:
compressible.
definite volume.
low density.
indefinite shape.
How many atoms of Oxygen are there in CaSO₄?
How many atoms of Sulfur are there in CaSO₄?
Answer:
There are 4 oxygen and 1 sulfur.
Explanation:
Calcium sulfate is made up of 1 calcium, 1 sulfur and 4 oxygen.
WHAT IS P=MV
EXPLAIN IN BREIF
Answer:
Potential energy = mass(velocity)
Explanation:
It is the formula used to explain how to find the answer for potential energy
Please help me ASAP I’ll mark Brainly thank you
Answer:
A higher hill will give more potential energy, and a lower hill will give less.
Explanation: Gravitational potential energy is the energy stored in an object based on its height and mass. The potential energy in an object increases as its elevation increases.
The table above this place up icicle properties of a diamond by the property names have been left out of the top row which property belongs in column one
Answer:
icicle becausit sounds right
Explanation:
icicles because it sounds right
This is a measure of mass per unit volume.
Answer:
Density
Explanation:
Density is defined as the mass per unit volume. It is the ratio between the mass and the volume of a substance. It does not matter how large or small a sample of matter is, the same substance will always have the same density, because of this. The ratio between the mass and volume remains the same.
1. Calculate the mass of the product, if you started with 4 g of Zn and 3 g of H2CO3.
Zn + H2CO3
ZnCO2 + H2 * I’ll cash app for the right answer plus explanation”
Answer:
6.07 g.
Explanation:
Hello!
In this case, given the chemical reaction:
[tex]Zn + H_2CO_3 \rightarrow ZnCO_3 + H_2[/tex]
We first need to compute the moles of each reactant considering their molar masses:
[tex]n_{Zn}=4gZn*\frac{1molZn}{65.38 gZn} =0.0612molZn\\\\n_{H_2CO_3}=3gH_2CO_3*\frac{1molH_2CO_3}{62.03 gH_2CO_3} =0.0484molH_2CO_3[/tex]
Now, compute the mass of zinc carbonate yielded by each reactant in order to pick out the correct limiting reactant:
[tex]n_{ZnCO3}^{by\ Zn} = 0.0612molZn*\frac{1molZnCO3}{1molZn}*\frac{125.4 gZnCO3}{1molZnCO3}=7.67gZnCO3 \\\\n_{ZnCO3}^{by\ H_2CO3} = 0.0484molH_2CO3*\frac{1molZnCO3}{1molH_2CO3}*\frac{125.4 gZnCO3}{1molZnCO3}=6.07gZnCO3[/tex]
Thus, we conclude carbonic acid is the limiting reactant as it produces the fewest grams of product and therefore the yielded mass of zinc carbonate product 6.07 g.
Best regards.
Click an item in the list or group of pictures at the bottom of the problem and, holding the button down,
correct position in the answer box. Release your mouse button when the item is place. If you change you
the item to the trashcan. Click the trashcan to clear all your answers.
Simplify by expressing fractional exponents instead of radicals.
y
12345678910
1 + xy + 12 13
4 15 16 17 18
9 10
abx
=
NEXT QUESTION
ASK FOR HELP
Answer:
X¹/⁴ Y¹/²
Explanation:
From the question given above, we are required to simplify:
⁸√(X²Y⁴)
The above expression can be simplified as follow:
⁸√(X²Y⁴)
Recall:
ⁿ√Aᵐ = Aᵐ/ⁿ
Therefore,
⁸√(X²Y⁴) = X²/⁸ Y⁴/⁸
⁸√(X²Y⁴) = X¹/⁴ Y¹/²
Thus, ⁸√(X²Y⁴) is equivalent to X¹/⁴ Y¹/²
Using standard heats of formation, calculate the standard enthalpy change for the following reaction. Ca(OH)2(aq) 2HCl(aq)CaCl2(s) 2H2O(l)
Answer:
ΔH = -29.78 KJ/mol
Explanation:
To calculate the Standard enthalpy of change for this reaction, we need to use the following expression:
ΔH = ΔHf(products) - ΔHf(reactants) (1)
Now, the standard heat of formation can be found in different handbooks or websites. I manage to find these for the compounds of the reaction:
ΔHf Ca(OH)₂ = -1002.82 KJ/mol
ΔHf HCl = -167.4 KJ/mol
ΔHf CaCl₂ = -795.8 KJ/mol
ΔHf H₂O = -285.8 KJ/mol
With these values, we can calculate the enthalpy change of the reaction using (1). Let's calculate first the individual values of the products and reactants and then, we can use (1):
Reaction: Ca(OH)₂ + 2HCl ---------> CaCl₂ + 2H₂O
ΔHf (products) = ΔHf CaCl₂ + ΔHf H₂O
ΔHf (products) = (-795.8) + 2(-285.8)
ΔHf (products) = -1367.4 KJ/mol
Keep in mind that if the compound has a coefficient that balances the reaction, you need to multiply that number by the standard heat. Let's calculate reactants:
ΔHf (reactants) = ΔHf Ca(OH)₂ + ΔHf HCl
ΔHf (reactants) = (-1002.82) + 2(-167.4)
ΔHf (reactants) = -1337.62 KJ/mol
Finally using expression (1) we have:
ΔH = (-1367.4) - (-1337.22)
ΔH = -29.78 KJ/molAlex rode her skateboard to the library. Her velocity changed from 2 m/s west
to 6 m/s west in 10 seconds. What was her acceleration?
A. 40 m/s2 west
B. 0.4 m/s2 west
C. 4 m/s2 west
D. 10 m/s2 west
SUBMIT
Answer:
0.4 m/s2 towards the West.
Explanation:
MARK ME THE BRAINLIES PLEASE!!
An organism that has two different alleles for a trait is known as?
Answer:
heterozygous
It takes to break a carbon-iodine single bond. Calculate the maximum wavelength of light for which a carbon-iodine single bond could be broken by absorbing a single photon.
Answer:
502.9 nm
Explanation:
Energy to break to the bond of carbon-iodine is not given assuming it to be 238KJ/mol
we know that
ΔE= hυ
also, υ= c/λ
therefore λ = hc/ΔE
[tex]= \frac{6.626\times10^{-34}\times3\times10^8}{238\times10^3}\\=0.08352\times10^{-29} m mol[/tex]
also, 1 mol = 6.022×10^23 atoms or molecules
[tex]\lambda= 0..08352\times10^{-29}\times6.022\times10^{23}\\=502.9 \times10^{-9}m\\=502.9 nm[/tex]
Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the
correct position in the answer box. Release your mouse button when the item is place. If you change your mind, drag
the item to the trashcan. Click the trashcan to clear all your answers.
Add the following polynomials, then place the answer in the proper location on the grid. Write the answer in descending
powers of x.
Find the sum of 4x3 + 2x2 - 4x + 3 and 7x3 -4x2 + 7x + 8.
DI
11
3
3
213141516
7890CD.
Answer:
11x³ – 2x² + 3x + 11
Explanation:
From the question given above:
We are to find the sum of:
4x³ + 2x² – 4x + 3 and 7x³ – 4x² + 7x + 8
To add the above polynomials together we must recognise that we can only add like terms together. The sum of the above polynomials can be obtained as follow:
. 4x³ + 2x² – 4x + 3
+ 7x³ – 4x² + 7x + 8
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
= 11x³ – 2x² + 3x + 11
Thus, the sum of 4x³ + 2x² – 4x + 3 and 7x³ – 4x² + 7x + 8 is 11x³ – 2x² + 3x + 11
group 1 elements tend to react with group ___ elements to form ___
Answer:
Group 1 elements tend to react with group Group 17 elements to form alkyl halide.
what type of chemical reaction is (a) Vinegar in diluted water?
Answer: When water is added to vinegar, the vinegar's acidity decreases, which results in a higher number on the pH scale. However, diluting vinegar with water can never make it alkaline, because water itself is not alkaline; the pH of the mixture can't be higher than the higher pH value of the two components.
Explanation: it loses acidity. Diluting it can never make it alkaline and the PH mixture can’t be higher.
atomic weight and atomic number of an element is 35 and 17 respectively