Answer:
The digestive system is a system where our body breaks down food to acquire important nutrients. This is the same as your local recycling center because they collect and breaks the plastic down to be reused into recycled products.
The excretory system is a system where we remove excess unnecessary materials. This can be the same as the recycling center because they remove unnecessary materials (such as trash that is not meant to be recycled).
topic:
surface area
(multiple choice)
irrelevant answers will be reported
Write the Keq for the dissolving of salt: NaCl → Na+ + Cl-.
The equilibrium constant of this reaction can be called the solubility product and is written as; Ksp = [Na^+] [Cl^-]
What is equilibrium constant?The term equilibrium constant refers to the number that shows the extent to which reactants are converted into products.
In this case, the equilibrium constant of this reaction can be called the solubility product and is written as; Ksp = [Na^+] [Cl^-]
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How much energy is released if a sample loses 0.025 kg mass through
radioactive decay?
Answer:
C
Explanation:
The amount of energy in radio active decay will be released 2.25 × [tex]10^{17}[/tex]J.
What is radioactive decay?The process of radioactive decay is the loss of energy through radiation from an unstable atomic nucleus. The term "radioactive" refers to a substance that contains unstable nuclei.
Calculation of energy which released in radioactive decay.
Given data:
M = 0.025 kg
E = ?
Energy of the radioactive decay can be determined by using the formula:
E= m[tex]c^{2}[/tex]
where, E is energy , m is mass and c is speed of light.
Put the value of given data in above equation.
E = (0.025) ×(3×[tex]10^{8}[/tex])∧2J
E = 0.025 × 9 × [tex]10^{18}[/tex].J
E = 0.225 × [tex]10^{18}[/tex].J
E= 2.25 × [tex]10^{17}[/tex]J
Therefore, The amount of energy in radio active decay will be released 2.25 × [tex]10^{17}[/tex]J.
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. The following describes some reactions that started with magnesium metal:
Calcium was heated in air to form a substance G G was added to a beaker of water to form
substance L. This substance L was then added to dilute sulphuric acid to form M and a liquid B.
a) Identify the substances labelled G, L, M and B
(2 Marks)
G
L
M
B
Answer:
This is an exothermic reaction. An exothermic reaction is a term that describes a chemical reaction in which there is a net release of energy (heat). Magnesium is also capable of reducing water to the highly-flammable hydrogen gas, which will be ignited by the excess heat given by the reduction reaction.
Explanation:
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Hydrogen (H
Helium (4)
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Berylium (BE)
Boron (B)
Carbon (c)
Nitrogen (N)
Oxygen (0)
Flaarine (F)
Neon (Nes
sodium (Na)
Magnesium (My
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Raj is trying to make a diagram to show what he has learned about nuclear fusion.
1 H e atom plus Energy right arrow 2 H atoms plus Heat plus Pressure.
Is his diagram correct, and if not, how could he fix it?
Yes, he should leave it as is because one atom of He plus energy results in two atoms of H and heat and pressure.
No, he should place energy on the right and heat and pressure on the left.
No, he should place the He atom and energy on the right, and the H atoms and heat and pressure on the left.
No, he should place the He atom on the right and the H atoms on the left.
Answer:
hope it helps make brainlliest ty
Answer:
C: No, he should place the He atom and energy on the right, and the H atoms and heat and pressure on the left.
Explanation:
Hola!
Bonjour!
Niihau!
Hello!
How are you?! How has life been? This is a mental health check-in. If you see this and you don't think you need to answer this, please leave a spot open for someone who may need it or write in the comments!
So after that: How are you? Happy, Sad, Mad, Confused, Hurt, Slow? Anything. Just tell me anything. If you need advice you can say so and you could get helpful advice from people! I really hope you know you're special and loved beyond imagination. It's gonna be hard some days but that's how we appreciate the good days! :) Keep doing you boo! <3
Answer:
Hi! I'm feeling great and happy! Life's been good! How are you? :) Hope life's good for you and that you are staying safe.
Explanation:
How many flourine atoms are present in 5.3 grams of flourine sample? (note that you have to use the 3 step method)
Answer:
1.7x10²³ Fluorine atoms are present
Explanation:
To solve this question we must know that, to find the amount of atoms of a substance from its mass, we have, as first, to convert this mass to moles using molar mass of the substance. With the moles we can find the amount of molecules using Avogadro's number. And with the formula we can know the atoms presents:
Moles Fluorine (F₂, Molar mass: 37.997g/mol)
5.3g * (1mol / 37.997g) = 0.139 moles F₂
Molecules F₂:
0.139 moles F₂ * (6.022x10²³molecules / mol) = 8.4x10²² molecules F₂
As 1 molecule of F₂ contains 2 atoms of Fluorine:
8.4x10²² molecules F₂ * 2 =
1.7x10²³ Fluorine atoms are presentStudents in a science class prepared flash cards so that they could quiz one another about the
arrangement of the periodic table. One of the flash cards contained information about two
elements, Element L and Element M.
Qualities:
-Atom of element M has two more balances electrons than element atoms of L
- atoms of element L are more reactive than atoms of element M
-both elements are metals
The students had to use the information on n the flash cards to determine possible positions of the two elements on a blank periodic table. Which periodic table has the elements placed in the locations that match the information on the flash cards?
Answer:
the periodic table is G.
The periodic table has the elements placed in the locations that match the information on the flash cards is F.
What is periodic table?The term "periodic table" refers to an arrangement of all known elements in order of increasing atomic number and recurrent chemical attributes. The periodic table is organized into 118 elements.
The term "periodic table" can also refer to a table that lists all known chemical elements in rows and columns.
In the F table, L is found in alkaline earth metals while M is found in transition metals. M has more valence electrons than L, while L is more reactive than M.
Thus, the periodic table has the elements placed in the locations that match the information on the flash cards is F.
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Who discovered electrons
during tbe 1880s and 90s scientist searched cathode rays for the carrier of the electrical properties in matter. the person who discovered Thomson of the electron of 1897.
The pH of a solution with a Hydronium (H30+) ion concentration of 0.001M is
Answer:
The pH of a solution with a Hydronium (H₃O⁺) ion concentration of 0.001 M is 3.
Explanation:
pH, short for Hydrogen Potential, is a measure used to establish the level of acidity or alkalinity of a solution.
pH indicates the amount of hydrogen ions present in a solution or substance. Mathematically the pH is the negative logarithm of the molar concentration of hydrogen ions or protons (H⁺) or hydronium ions (H₃O⁺).
pH= - log [H⁺]= - log [H₃O⁺]
The pH scale goes from 0 to 14. Values less than 7 indicate the range of acidity and those greater than 7 indicate alkalinity or basicity. The value 7 is considered neutral.
In this case, [H₃O⁺]= 0.001 M.
Replacing in the definition of pH:
pH= - log (0.001 M)
Solving:
pH= 3
The pH of a solution with a Hydronium (H₃O⁺) ion concentration of 0.001 M is 3.
The initial amount of low-quality energy available from an energy resource is called its net energy.
Answer:
La cantidad de energía disponible de una fuente de energía determinada se denomina recurso energético. La escasez de recursos energéticos (petróleo, carbón y madera) en algunas de las fuentes de energía más utilizadas plantear necesidad de usar otras fuentes investigar el modo más rentable de emplearlas
Explanation:
Answer:
false
Explanation:
its the amount of high-quality energy available from a given quantity of an energy resource minus the high-quality energy needed to make the energy available.
If you start with 50 grams of H2O how much NaOH would you produce
2 Na + 2 H2O = 2 NaOH + H2
Calcula la densidad del gas a TPE para los siguientes: 969cm3 de un gas 64 grados C y 96.4 kPa con una masa de 1.64g
Respuesta:
2.17 × 10⁻³ g/cm³
Explicación:
Paso 1: Información provista
Volumen inicial (V₁): 969 cm³Temperatura inicial (T₁): 64 °CPresión inicial (P₁): 96.4 kPaVolumen en TPE (V₂): ?Presión estandar (P₂): 100 kPaTemperatura estandar (T₂): 273.15 KPaso 2: Convertir 64 °C a Kelvin
Usaremos la siguiente fórmula.
K = °C + 273.15 = 64 °C + 273.15 = 337 K
Paso 3: Calcular V₂
Usaremos la ecuación combinada de los gases ideales.
P₁ × V₁ / T₁ = P₂ × V₂ / T₂
V₂ = P₁ × V₁ × T₂ / T₁ × P₂
V₂ = 96.4 kPa × 969 cm³ × 273.15 K / 337 K × 100 kPa = 757 cm³
Paso 4: Calcular la densidad del gas a TPE
A TPE, 1.64 g del gas ocupan 757 cm³.
ρ = 1.64 g/757 cm³ = 2.17 × 10⁻³ g/cm³
A sample of gas with a volume of 5.0 m3 at a temperature of 298 K and a pressure of 0.84 atmospheres is left in a closed container where the temperature increases to 323 K and the pressure increases to 0.89 atmospheres. What is the new volume of a gas sample?
Answer:
5.12 m³
Explanation:
Using the combined gas law formula as follows:
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (m³)
V2 = final volume (m³)
T1 = initial temperature (K)
T2 = final temperature (K)
According to this question;
V1 = 5.0 m³
V2 = ?
P1 = 0.84 atm
P2 = 0.89 atm
T1 = 298 K
T2 = 323 K
Using
P1V1/T1 = P2V2/T2
0.84 × 5/298 = 0.89 × V2/323
4.2/298 = 0.89V2/323
Cross multiply
4.2 × 323 = 298 × 0.89V2
1356.6 = 265.22V2
V2 = 1356.6 ÷ 265.22
V2 = 5.12 m³
If I have an unknown quantity of gas at a pressure of 204.83 kPa, a volume of 27.88 liters, and a temperature of 8.76°C , how many moles of gas do I have?
Answer:
700
Explanation:
How to find
Multiply the volume and pressure and divide the product by the temperature and the molar gas constant to calculate the moles of the hydrogen gas.
Solve: 204.83 × 27.88 / 8.76 = 651.901872146
Which is 651.90
In the nearest hundredths, the moles of gas is 700
What is a practically insignificant reaction?
Answer:
Practical significance refers to the magnitude of the difference, which is known as the effect size. Results are practically significant when the difference is large enough to be meaningful in real life. ... Very small differences will be statistically significant with a very large sample size.
Explanation:
Hope it helps
FOLLOW MY ACCOUNT PLS PLS
A(n)
Is the explanation of phenomena through the use of several Investigations or a scientific method.
O hypothesis
O scientific theory
O scientific law
3C6H206
How many atoms are there? Help ASAP!
Answer:
the answer to this is 74 :)
Which air mass would be cold and wet?
Group of answer choices
mP
mT
cT
cP
A
Answer: mP
Explanation:
Maritime polar forms cold water and the weather is cold and wet.
;)
How many grams of aluminum to complete the reactions below?
Extra Content
6HCl(aq) + 2Al(s) → 2AlCl3(s) + 3H2(g)
six moles of hydrochloric acid reacts with two moles of aluminum to produce 2 moles of aluminum chloride plus 3 moles of hydrogen gas.
A.
26.9 grams
B.
55 grams
C.
53.96 grams
D.
2 grams
The answer is option C
Explanation:
Al= 26.982
2 moles of aluminium wad given so
2× 26.982= 53.96 grams
Question 2
5 pts
The air inside a beach ball is at a temperature of 25°C a pressure of 1.0 atm. The ball
contains 0.85 mol of air, what is its volume?
21 L
27 L
0 171
06.11
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Nest
Answer: The volume of given ball is 21 L.
Explanation:
Given : Pressure = 1.0 atm, no. of moles = 0.85 mol
Temperature = [tex]25^{o}C = (25 + 273) K = 298 K[/tex]
According to the ideal gas equation, formula used is as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\1.0 atm \times V = 0.85 mol \times 0.0821 Latm/mol K \times 298 K\\V = 21 L[/tex]
Thus, we can conclude that the volume is 21 L.
Select the correct answer.
An iron bar at 200°C i placed in thermal contact with an identical iron bar at 120°C in an isolated system. After 30 minutes, both iron bars are at
160°C. the iron bars were placed in thermal contact in an open system instead of an isolated system, how would the results be different?
Assume that the room temperature is 25°C.
O A The temperatures of the iron bars after 30 minutes would be less than 160°C because heat would be lost to the surroundings.
O B. it would take more than 30 minutes for both iron bars reach 160°C because heat would be transferred less efficiently.
O C. The temperatures of both iron bars would increase as they absorb heat from the surroundings.
O D. The temperatures of both iron bars would decrease because pieces of them would be lost to the surroundings.
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A gas has a pressure of 1.00 atm at 25 degrees Celsius. What is the pressure of the gas at 323 degrees Celsius.
Please help thanks.
Answer:
The pressure of the gas at 323 degrees Celsius is 2 atm.
Explanation:
Gay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.
In short, when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases.
Gay-Lussac's law can be expressed mathematically as follows:
[tex]\frac{P}{T} =k[/tex]
Where P = pressure, T = temperature, K = Constant
Having two different states, an initial state 1 and a final state 2, it is satisfied:
[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]
In this case:
P1= 1 atmT1= 25 C= 298 K (being 0 C= 273 K)P2= ?T2= 323 C= 596 KReplacing:
[tex]\frac{1 atm}{298 K} =\frac{P2}{596 K}[/tex]
Solving:
[tex]P2=\frac{1 atm}{298 K}*596 K[/tex]
P2= 2 atm
The pressure of the gas at 323 degrees Celsius is 2 atm.
8.0 mol of methane gas reacts completely in a 2.00L container containing excess O2 in 3.2s. Find average rate of consumption of methane
Answer:
1.3 M/s
Explanation:
Step 1: Given data
Initial amount of methane (ni): 8.0 molFinal amount of methane (nf): 0 mol (it reacts completely)Volume of the container (V): 2.00 LTime elapsed (t): 3.2 sStep 2: Calculate the average rate of consumption of methane
Methane burns in excess oxygen according to the following equation.}
CH₄ + 2 O₂ ⇒ CO₂ + 2 H₂O
We can calculate the average rate of consumption of methane (r) using the following expression.
r = - Δn/V × t = - (nf- ni) / V × t
r = - (0 mol - 8.0 mol) / 2.00 L × 3.2 s = 1.3 M/s
Does heating a cup of water allow it to dissolve more sugar? Temperature of the water is measured in degrees Centigrade. Amount of sugar is measured in grams. Dependent
Answer:
Yes
Explanation:
Yes heating water allows it to dissolve more Sugars because the molecular distance increases and this distance can be covered by more sugar. In the given question, The independent variable would be the temperature of water.
An ideal gas contained in 5.0 liter chamber at a temperature of 37°C. If
the gas exerts a pressure of 2.0 atm on the walls of the chamber, which of
the following expressions is equal to the number of moles of the gas?
a.
(2.0)(5.0)
(2.0) (310)
b. (2.0)(0.0821)
(5.0) (37)
c.
(2.0) (0.0821)
(5.0) (310)
d.
(0.0821) (37)
(0.0821)(5.0)
e.
(2.0)(5.0)
(0.0821) (310)
Answer:
i am doing this in science also i would like to know if u know
Explanation:
When does a decay chain end?
A. When there is no more mass
B. When radiation has been emitted
C. When the element is stable
D. When the half-life is reached
Answer:
C. When the element is stable
Explanation:
Just answered on apx
how much heat is required to increase the temperature of 20 grams of water by 26 degrees celsius?
Answer: 2175.68 J heat is required to increase the temperature of 20 grams of water by 26 degrees celsius.
Explanation:
Given: Mass = 20 g
Change in temperature = [tex]26^{o}C[/tex]
The standard value of specific heat of water is [tex]4.184 J/ g^{o}C[/tex]
Formula used to calculate the heat energy is as follows.
[tex]q = m \times C \times \Delta T[/tex]
where,
q = heat energy
m = mass of substance
C = specific heat of substance
[tex]\Delta T[/tex] = change in temperature
Substitute the values into above formula as follows.
[tex]q = m \times C \times \Delta T\\= 20 g \times 4.184 J/g ^{o}C \times 26^{o}C\\= 2175.68 J[/tex]
Thus, we can conclude that 2175.68 J heat is required to increase the temperature of 20 grams of water by 26 degrees celsius.
identify the state of matter in the box,
Answer:
gas
Explanation:
particles are very far apart
The given diagram represents gaseous state of matter. Both a volume and a definite form are absent from a gas. The separation of gas particles is great.
What is state of matter?Solids, liquids, gases, plus plasma are the four states of matter that may be found in daily life. However, a number of additional states of matter have indeed been found.
Some of these additional states are created when a material transitions among two states of matter and doesn't actually exhibit the characteristics of either state. The most exotic are others. Both a volume and a definite form are absent from a gas. The separation of gas particles is great. The gas in a balloon and the air are two examples of gases. The given diagram represents gaseous state of matter.
Therefore, the given diagram represents gaseous state of matter.
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