Help with this question
Answer:
I’ll help what’s the question
Explanation:
Answer:
Aight wats da question
Explanation:
5. A gas at 127०C and 10.0 L expands to 20.0 L. What is the new temperature in Celcius? (HINT: You need to convert to Kelvins solve then convert answer back to ०C)
Answer:
The new temperature is 527.15 ºC.
Explanation:
Charles’s law states that the volume of a fixed amount of gas maintained at constant pressure is directly proportional to the absolute temperature of the gas (the absolute temperature is the Kelvin temperature).
We need to calculate the temperature after the expansion, that is T₂. For that, we use Charles' law:
[tex] V₁ ÷ T₁ = V₂ ÷ T₂ [/tex]
Because we have to use the absolute temperature, we convert ºC to K adding 273.15:
T₁ = 127 ºC + 273.15 ºC = 400.15 K
[tex] T₂ = V₂ × T₁ ÷ V₁ [/tex]
[tex] T₂ = 20. 0 L × 400.15 K ÷ 10.0 L [/tex]
T₂ = 800.3 K
We substract 273.15 to the result to convert it back to ºC:
T₂ = 800.3 - 273.15 = 527.15 ºC.
Can someone help me with this chemistry question?
(This isn't the question but I need some help, I'll give 50 points to whoever can correctly answer my next question)
Answer:
We can't see the question. Can you upload a picture of it or write the question in the comments
KK
Which chemistry question?
The immune system consists of two main parts or system. One system works 24/7 and protects your regardless of what type of microorganism is encountered. This system is called the ______________________ system. The other system requires recognition of the invader to react and begin to fight back an infection. This is called the __________________________ system.
Answer:
Innate immune system Acquired immune systemExplanation:
The innate immune system is a defense system with which we are all born and which protects us at all times against all antigens, prevents harmful external bodies from entering our body.
The acquired immune system is the second line of defense and develops by exposing itself to various antigens, building a defense against it when the innate system cannot fight the invader.
Answer:
Part A. The Innate immune system
Part B. The adaptive (or active) immune system
Explanation:
The immune system refers to the organs, tissues cells and proteins which work together to protect the body from harmful invaders that cause disease such as micro-organisms like viruses, bacteria, etc.
Organs and tissues that form part of the immune system include the thymus and bone marrow, lymph nodes and vessels, spleen, and skin.
The main immune cells are the white blood cells, also called leukocytes. Some types of white blood cells, called phagocytes engulf invading organisms. Others called lymphocytes help the body remember the invaders and destroy them. The two kinds of lymphocytes are B lymphocytes and T lymphocytes, whose name depend on where they mature. Lymphocytes start their life in the bone marrow and either stay there and mature into B cells, or go to the thymus gland to mature into T cells.
The immune system consists of two main parts or system.
Innate immunity: This refers to the immunity one is born with. Innate (or natural) immunity, provides a general type of protection. For example, the skin acts as a barrier to block germs from entering the body. Adaptive (or active) immunity: This refers to the immunity one develops throughout their lives. It is developed when one is exposed to diseases or when one is immunized against them with vaccines.rust is an oxide of _____
Answer:
iron
Explanation:
rust is an oxide of iron
are computers capable of inductive reasoning
A substance changes from a solid to a liquid at its
Answer:
Melting point
Explanation:
Answer:
Melting point
Explanation:
When a solid turns into a liquid, it is melting. Therefore, it is the melting point.
Which quantities are conserved in all oxidation-reduction reactions?
Answer:
Mass and charge is conserved
Explanation:
According to the law of conservation of mass, matter is neither created or destroyed. With the exception of nuclear reactions where mass is converted to energy thereby leading to an apparent loss in mass, this law applies to chemical reactions.
A redox reaction is a type of chemical reaction which involves a transfer of electrons. In a redox reaction, the mass of reactant particles is conserved. Also, as electrons are transferred between atoms, one donates and the other accepts. The charge of atoms depends on this gain or loss of electrons. A gain of electrons reduced the charge of an atom whereas a loss of electrons increases the charge. This two processes occur concurrently, therefore, charge is also conserved.
Bronwyn completed the same chemical reaction four times. She weighed the amount of chemical produced by each experiment. Which result would show that the experiment is valid?
Answer:
If the weight of chemical is same so it represent that the experiment is valid.
Explanation:
If Bronwyn performed the same chemical reaction four times and she measure the weight of chemical with the help of electrical weight balance so if she find out the weight of the chemical that is produced during four experiments then we can say that the experiment is valid because the experiment was performed four times and that is enough for validation of the experiment.
What is the volume of .00831 mol of gas under ideal conditions if the
pressure is 1.01 atm and the temperature is 25 degrees C?*
Answer:
Approximately [tex]0.20\; \rm L[/tex].
Explanation:
Convert the temperature of this gas to absolute temperature:
[tex]T = 25\; \rm ^\circ C \approx (25 + 273.15)\; \rm K = 298.15\; \rm K[/tex].
Let [tex]P[/tex] and [tex]V[/tex] represent the pressure and volume of this gas, respectively. Let [tex]n[/tex] represent the number of gas particles in this gas. Let [tex]R[/tex] represent the ideal gas constant. By the ideal gas law:
[tex]P \cdot V = n \cdot R \cdot T[/tex].
For this question:
[tex]P = 1.01\; \rm atm[/tex] (given,) [tex]T = 298.15\; \rm K[/tex] (from unit conversion,) and[tex]n = 0.00831\; \rm mol[/tex].Look up the ideal gas constant [tex]R[/tex] that takes [tex]\rm atm[/tex] as the unit for pressure:
[tex]R \approx 0.082057\; \rm L \cdot atm \cdot K^{-1}\cdot mol^{-1}[/tex].
This question is asking for [tex]V[/tex], the volume of this gas. Rearrange the ideal gas equation and solve for [tex]V[/tex]:
[tex]\begin{aligned} V &= \frac{n \cdot R \cdot T}{P} \\ &\approx \frac{0.00831\; \rm mol\times 0.0082057\; \rm L \cdot atm \cdot K^{-1}\cdot mol^{-1}\cdot 298.15\; \rm K}{1.01\; \rm atm} \\ &\approx 0.0020\; \rm L\end{aligned}[/tex].
Determine the freezing point of a water solution of fructose (C6H12O6) made by dissolving 92.0 g of fructose in 202 g of water.
Answer in units of ◦C.
Answer:
THE FREEZING POINT OF A WATER SOLUTION OF FRUCTOSE MADE BY DISSOLVING 92 g OF FRUCTOSE IN 202g OF WATER IS -4.70 ◦C
Explanation:
To calculate the freezing point of a water solution of fructose,
1. calculate the molar mass of Fructose
( 12 * 6 + 1*12 + 16*6) =72 + 12 +96 = 180 g/mol
2. calculate the number of moles of fructose in the solution
number of moles = mass / molar mass
n = 92 g / 180 g/mol
n = 0.511 moles.
3. calculate the molarity of the solution
molarity = moles / mass of water in kg
molarity = 0.5111 / 202 g /1000 g
molarity = 0.5111 / 0.202
molarity = 2.529 M
4. calculate the change in the freezing point of pure solvent and solution ΔTf
ΔTf = Kf * molarity of the solute
Kf = 1.86 ◦C/m for water
ΔTf = 1.86 * 2.529
ΔTf = 4.70 C
5. the freezing point is therefore
0.00 ◦C - 4.70 ◦C = -4.70 ◦C
Answer:
-4.7°C
Explanation:
In this question, we want to calculate the freezing point of the water solution of fructose.
We proceed as follows;
Firstly, we find the number of moles of the fructose using molar mass
Number of moles = mass/molar mass
mass is 92g , molar mass of fructose is 180g/mol
Number of moles = 92/180 = 0.51 moles
Next thing is to calculate the molality of the solution = number of moles of fructose/mass of water in kg = 0.51/(202/1000) = 0.51/0.202 = 2.525m
Now, we calculate the freezing point depression;
Δ[tex]T_{f}[/tex] = [tex]K_{f}[/tex] × m
where [tex]K_{f}[/tex] refers to the molal freezing point depression of the solvent = 1.86
Δ[tex]T_{f}[/tex] = 1.86 × 2.525 = 4.7 °C
Since the presence of impurities decrease freezing point and the normal freezing point of water is 0 °C, the freezing point of the solution is 0-4.7 = -4.7 °C
How can scientists use data to predict changes in
the shape of the Earth?
Which solution will boil at the highest temperature? *
1 mole of sugar in 500 g of water
1 mole of sugar in 1,000 g of water
2 moles of sugar in 500 g of water
2 moles of sugar in 1,000 g of water
Answer:
2 moles of sugar in 1,000g of water
_______ is force divided by area.
Answer:
Pressure
Explanation:
Basically when you are pressing something you are applying force over an area thus Pressure is force divided by area.
Answer:
pressure
Explanation:
what is the new temperature when 10 L at 5 K is compressed to 4.00 L
a) 20 K
b) 25 K
c) 2 K
d) 0.5 K
Answer: C
Explanation:
For this problem, we would use Charles's Law. We fill in what we are given and solve.
Charles's Law: [tex]\frac{V_{1} }{T_{1} } =\frac{V_{2} }{T_{2} }[/tex]
[tex]\frac{10 L}{5K} =\frac{4.00L}{T_{2} }[/tex]
[tex]10T_{2}= 20[/tex]
[tex]T_{2}=2K[/tex]
Express glucose in terms of atom ratio and mass ratio
Answer:
C6H120
Explanation:
atom ratio= 1:2:1 even though it has 6 carbon.
mass ratio=6:1:8
is this what you wanted/needed?
heat transfer between two systems only occurs if there is a
Answer: thermal equilibrium
Explanation: the temperature increased only when all of the water was in one phase.
What is activation energy?
A.the heat energy given off by a reaction
B.the energy needed to get a reaction started
C.the energy absorbed by the bonds that form in a reaction
D.the energy stored in the bonds of a reactions enzyme
I NEED HELP ASAP
Answer:
B
Explanation:
energy needed to get a reaction started
hope this helps. good luck :)
Why can’t molecular compounds replenish electrolytes when dissolved in water
Answer:
Electrolytes are salts or molecules that ionize completely in solution. As a result, electrolyte solutions readily conduct electricity.
Nonelectrolytes do not dissociate into ions in solution; nonelectrolyte solutions do not, therefore, conduct electricity.
nonelectrolyteA substance that does not dissociate into ions when in solution.
solutionA homogeneous mixture, which may be a liquid, gas, or solid, formed by dissolving one or more substances.
solute Any substance that is dissolved in a liquid solvent to create a solution.
electrolyte A substance that dissociates into ions when in solution.
saltAn ionic compound composed of cations and anions that are held together by electrostatic attraction.
when an ionizable solute dissociates, the resulting solution can conduct electricity. Therefore, compounds that readily form ions in solution are known as strong electrolytes. (By this reasoning, all strong acids and strong bases are strong electrolytes.)
By contrast, if a compound dissociates to a small extent, the solution will be a weak conductor of electricity; a compound that only dissociates weakly, therefore, is known as a weak electrolyte.
A strong electrolyte will completely dissociate into its component ions in solution; a weak electrolyte, on the other hand, will remain mostly undissociated in solution. An example of a weak electrolyte is acetic acid, which is also a weak acid.
Nonelectrolytes are compounds that do not ionize at all in solution.
14. Acid + Metal carbonate:?
a. Salt + water + carbon dioxide
b. Salt + carbon dioxide
c. Salt + water + hydrogen
d. Salt + hydrogen
Answer:
The answer is A.
Explanation:
When acid react with metal carbonate, it will form salt, water and carbon dioxide.
For example :
HCl + CaCO3 → CaCl + H2O + CO2
Which of the following elements has the highest first ionization energy?
A. Calcium (Ca)
B. Beryllium (Be)
C. Strontium (Sr)
D. Magnesium (Mg)
Answer:
B. Beryllium
Explanation:
because the trend of ionization is going up a group it increases, as going across a period it deceases. beryllium being closes to the hist point in the periodic table it has the highest ionization energy. hope this helps.
Answer: B. Beryllium
Explanation: Apex
Which is most likely to influence the properties of an element? *
-its atomic mass
-its atomic number
-the number of outer electroms
-the number of isotopes
Answer:
-the number of outer electrons
Explanation:
Outer electrons are referred to as valence electrons and they are typically what determines the property of an elements such as their reactivity.
For eg, Na (sodium) has 1 valence electron and it really wants to give it aways so it can return back to octet rule (having 8 electrons in outershell) to become stable. So when you put sodium in water (you can watch videos of it) it literally blows because of high reactivity.
Given:
CH4 + 2O2 → CO2 + 2H2O, ΔH = -890 kJ/mol
How much energy is released when 59.7 grams of methane (CH4) reacts with oxygen?
The combustion of 59.7 grams of methane releases ___ kilojoules of energy
(I've seen two different answers both with goof reviews but I don't know which one is correct. This is for Edmentum btw)
Answer:
The combustion will release -3,321 KJ/mol of energy
Explanation:
What we need to do here is to first calculate the number of moles of methane burnt.
Mathematically, the number of moles of methane burnt = mass of methane/molar mass of methane
Molar mass of methane = 16g /mol
Thus the
number of moles will be ;
59.7/16 = 3.73 moles
Now, 1 mole of methane produces -890 KJ/mol if energy
Then the energy produced by by 3.73 moles of methane would be 3.73 * 890 = -3,320.8125
which is approximately -3,321 KJ/mol
Kindly note that the amount of heat is negative because it is an exothermic reaction
What happens when the pressure of a gas is lowered? A. The number of molecules increases. B. The molecules collide less frequently. C. The molecules decrease in volume. D. The temperature of the system increases.
Answer:
B. The molecules collide less frequently.
Explanation:
When the pressure of a gas is lowered, the molecules collide less frequently and the correct option is option B.
Pressure of a gas is a measure of the force exerted by gas molecules on the walls of the container in which the gas is contained. It is a result of the random and continuous collisions of gas molecules with the container surface.
When the pressure of a gas is lowered, it means that the force exerted by the gas molecules on the container walls decreases. This can occur due to a decrease in the number of gas molecules or a decrease in their average kinetic energy, resulting in less frequent and less forceful collisions with the container.
Lowering the pressure of a gas does not necessarily imply an increase in the number of gas molecules or a decrease in their volume.
Thus, the ideal selection is option B.
Learn more about Pressure of gas, here:
https://brainly.com/question/31525061
#SPJ6
in the lewis structure for a molecule of methyl chloride, how many lone pairs of electrons does chlorine have when it is bonded with carbon
A. 4
B. 0
C. 3
D. 2
Answer : The correct option is, (C) 3
Explanation :
Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.
In the Lewis-dot structure the valance electrons are shown by 'dot'.
The given molecule is, [tex]CH_3Cl[/tex]
As we know that carbon has '4' valence electrons, hydrogen has '1' valence electron and chlorine has '7' valence electrons.
Therefore, the total number of valence electrons in [tex]CH_3Cl[/tex] = 4 + 3(1) + 7 = 14
According to Lewis-dot structure, there are 8 number of bonding electrons and 6 number of non-bonding electrons.
Hence, the number of lone pairs of electrons present on chlorine are, 3.
Which is not a binary compound?
a - h2o
b- NaCl
c- NaOH
d-CH4
11 grams of carbon dioxide, CO2, is dissolved in 1000 mL of solution. Determine the molarity (M).
Answer: The molarity is 0.25 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in ml
moles of [tex]CO_2[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{11g}{44g/mol}=0.25mol[/tex]
Now put all the given values in the formula of molality, we get
[tex]Molarity=\frac{0.25\times 1000}{1000ml}[/tex]
[tex]Molarity=0.25M[/tex]
Therefore, the molarity is 0.25 M
which one of the following is not responsible
forgrowth of Industries
Rapid growth of Industries
2 Increasing population
3 Haqvy rainfall
4 mismanagement of water resources
the length of a string is 16cm.Its length becomes 20cm when supporting a weight of 5N.Calculate the length of the string when supporting a weight of 6N.Comment on the answer
Answer:
[tex]20.8cm[/tex]Explanation:
According to hooks law "provide the elastic limit of an elastic material is not exceeded the extension e is directly proportional to the applied force F"
[tex]F= ke[/tex]
where F= applied force
k= spring constant
e= extension
Given data
length of string l = 16cm
extension e = 20-16= 4cm
applied force = 5N
we need t o first calculate the spring constant k
apply the formula
[tex]F= ke[/tex]
[tex]5=k*4\\k= \frac{5}{4} \\k= 1.25N/cm[/tex]
we can now calculate the extension of the string when supporting a 6N weight
[tex]F= ke\\6=1.25*e\\e= \frac{6}{1.25} \\e= 4.8cm[/tex]
The length of the string when supporting a 6N weight is
[tex]= length+ extension\\= 16+4.8\\= 20.8cm[/tex]
COMMENT :According to the analysis an extra weight of 1N will cause add 0.8cm to the length of the string
what does temperature mean
Answer:
the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.
Explanation:
if you need a definition of a word, you can look in a dictionary as well for future reference
Answer:
Temperature means the hotness or coldness of anything.
Explanation:
The exact definition is: "The degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch."
