Answer:
neck
Explanation:
through the neck and opening of the thermos, where there is no vacuum.. hence heat is easily transmitted resulting into heat loss
a student used a vernier magnetic field sensor to measure the strength of the magnetic field generated by a bar magnet. at which position is the
strength of the magnetic field strongest point a or point b?
The position is the strength of the magnetic field strongest is is the place where the magnetic field leaves, being point A.
What generates a magnetic field?When an electrically charged particle moves, it creates a magnetic field. According to the laws of electromagnetism, this magnetic field originates from the variation of the electric field strength.
In the region of the poles we see that the lines of magnetic induction are closer to each other, therefore, we consider that close to the poles the magnetic field is more intense.
See more about magentic field at brainly.com/question/14848188
#SPJ1
what biological molecules transport other substances, provide structural
support, cause the movement of muscles, and catalyze chemical reactions in
living organisms?
The biological molecules that transport other substances are the proteins.
What are proteins?Proteins are biological macromolecules that contains nitrogen in their molecules and are the building block of a living organism.
The proteins perform the following functions:
they transport other substances,provide structural support,cause the movement of muscles, and catalyze chemical reactions in living organisms.Learn more about protein here:
https://brainly.com/question/10058019
#SPJ1
Which refers specifically to a heated solution that holds more dissolved solution than it can hold at a lower temperature?.
Answer:
Supersaturated solution
Explanation:
Weren't there any options?
Anyways, the best I can think of right now is a supersaturated solution.
How do you know which element the little number (subscript) goes with?
Answer:
you will not
Explanation:
the little subscript number just indicates how many of a certain atom is in a molecule... example H₂O... that little ₂ means that there are 2 hydrogen atoms in the water molecule.
there is an invisible ₁ on the O as well. H₂O₁ shows there is one oxygen atom in the water molecule, but we do not show the 1
Answer:
The little number you see to the right of the symbol for an element is called a subscript. That number indicates the number of atoms of that element present in the compound. When balancing an equation, you can change the coefficients but not the subscripts.
Based on Charles's law, which of the following statements is true for an ideal gas at a constant pressure and mole amount?
The number of collisions is independent of volume.
The number of collisions decreases with increase in volume.
Volume is directly proportional to absolute temperature.
Volume is inversely proportional to absolute temperature.
Answer:
the number of collisions is independent of Volume.
Based on Charles's law, an ideal gas at a constant pressure and mole amount is " the number of collisions is independent of volume."
What is Charles's law?Gases have a propensity to expand while heated, according to Charles' law, an innovative gas law.
What is collisions?A collision would be any situation in where two or even more bodies quickly number of factors on one another.
Based on Charles's law, an ideal gas at a constant pressure and mole amount is " the number of collisions is independent of volume."
Therefore, the correct answer will be option (A).
To know more about collisions and Charles's law
https://brainly.com/question/16927784
#SPJ3
What differences do you notice when you heat up the brick and the iron at same temperature?
After heating the brick and the iron, it is observed that the brick heats up quicker and the brick releases energy quicker.
What is thermal energy?Thermal energy (also called heat energy) is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other.
The iron has more energy than the brick even though it is at the same temperature. That means that the iron must have more particles than the brick.
Iron and brick are both solids and have the same volume, so the difference in total energy must be due to atomic composition.
Learn more about thermal energy here:
https://brainly.com/question/14506133
#SPJ1
Identify the solutions among the following mixtures
Soil, Sea water, Air, Coal, Soda water
Answer:
Out of the above mixtures, seawater, air, and soda water are solutions.
hope this helps :3
if energy can neither be created nor destroyed, into what kinds of energy have these resources been transformed?
Answer:
Heat, Sound
Explanation:
I am pretty sure you are addressing mechanical energy and machine efficiency. So you are probably aware a machine can't achieve 100% efficiency because of the first and second laws of thermodynamics. This energy is lost to friction and air resistance. They convert some gravitational potential energy to heat and sound energy rather than all to kinetic energy, and vice versa.
Why is the alkyl bromide substrate below not capable of undergoing an E2 elimination reaction upon treatment with potassium hydroxide (KOH) in ethanol (EtOH)
An E2 mechanism is not followed because an anti periplanar E2 elimination is impossible due to the lack of beta hydrogen.
What is elimination?The term elimination has to do with the removal of a proton from the substrate by a base.
This question is incomplete and the complete question showing the options have been shown in the image attached to this answer.
This elimination results in an alkene being formed. For the substrate alkyl halide shown in the question, an E2 mechanism is not followed because an anti periplanar E2 elimination is impossible due to the lack of beta hydrogen.
Learn more about elimination reaction:https://brainly.com/question/8739887
#SPJ4
A solution of potassium nitrate is made when potassium nitrate dissolves in water.
Describe a method you could use to obtain crystals of potassium nitrate from
potassium nitrate solution.
You should include an explanation of the process by which the crystals are produced
from the solution.
[6 marks]
Answer:
Boil the water and stir in potassium nitrate. If it doesn't all dissolve, you can cook it on the stove or microwave it until the water boils again. Remove the solution from heat, but let it cool slowly for the best crystal formation.
What is the difference between, Flame tests and Flame emission spectroscopy?
Answer:
Flame testing is an analytical technique where a sample is applied to a flame, and the characteristic emission spectrum is used to identify different elements.
Answer:
Flame testing is an analytical technique where a sample is applied to a flame, and the characteristic emission spectrum is used to identify different elements. When this technique is used to identify metal species, it is called metal flame emission testing while Flame emission spectrophotometry is based on the characteristic emission of light by atoms of many metallic elements when given sufficient energy, such as that supplied by a hot flame.
How many atoms are in 3.2 moles of N2
Answer:
38.54 x 10^23 atoms of N2
Explanation:
Each mole contains Avagadro's Number ( 6.022 x10^23) of particles
3.2 x 6.022 x 10^23 = 19.27 x 10^23 MOLECULES
N2 is TWO atoms soooo 2 x 19.27 x 10^23 = 38.54 x 10^23 atoms
Write the balanced equations for the following nuclear reactions.
ASAPPP
[tex]^{233}_{92}U\;\rightarrow\;^4_{2}He\;+\;^{229}_{90}Th[/tex] is the balanced equations for the following nuclear reactions.
What are balanced equations?A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products
Uranium-233 is produced by the neutron irradiation of thorium-232. When thorium-232 absorbs a neutron, it becomes thorium-233, which has a half-life of only 22 minutes.
Hence, [tex]^{233}_{92}U\;\rightarrow\;^4_{2}He\;+\;^{229}_{90}Th[/tex] is the balanced equations for the following nuclear reactions.
Learn more about the balanced equations here:
https://brainly.com/question/12192253
#SPJ1
What is the pH of a solution that contains 0.0003 moles of KOH in 410 mL of solution?
Answer: 10.865
Explanation:
The molarity of the solution is [tex]\frac{0.0003}{0.410}=0.0007317073 \text{ M}[/tex].
So, the pOH is [tex]-\log(0.0007317073)=3.135[/tex]
Since pH + pOH = 14, the pH is 14-3.135, which is about 10.865
Based on table n, uranium-238 and uranium-235 have different
a)decay modes
b)half lives
c)number of protons
d)number of electrons
According to table N, the isotopes uranium-238 and uranium-235 have different half lives.
What are radioactive nuclides?Radioactive nuclides are those nuclides that are able to undergo radioactive decay. They have specific modes of decay that is peculiar to each isotope.
Hence, according to table N, the isotopes uranium-238 and uranium-235 have different half lives.
Learn more about uranium-238:https://brainly.com/question/9099776
#SPJ1
How do you assume the help position to reduce heat loss in cold water?.
Crossing your arms across the chest and pulling the knees up to your chest is how the HELP position is achieved.
What is HELP position?This is referred to as heat escape lessening position and reduces heat loss in individuals when in cold water.
This position helps to protect groin, head/neck, and rib cage/armpits areas of the body.
Read more about Heat loss here https://brainly.com/question/6850851
#SPJ1
Identify which substitution product is expected to be favored. Explain. The inverted product is expected to predominate slightly, due to SN2 competition. The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
What is substitution product?Substitution product is a product that is gotten from a reaction in which a group of reactant is replaced by another group in the reaction.
Therefore,The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
Learn more about substitution reaction below.
https://brainly.com/question/10143438
#SPJ1
The following diagram represents what type of reaction?
The type of reaction represented by the diagram is (C). Fission
Meaning of Nuclear FissionNuclear fission can be defined as a reaction in which the nucleus of an atom splits or breaks into two or more smaller portions of nuclei.
Nuclear fission is so important and is often seen or encountered when dealing with elements with high nuclear properties.
In conclusion, the type of reaction represented by the diagram is Fission
Learn more about Nuclear Fission: https://brainly.com/question/3992688
#SPJ1
What is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4oC?
[tex]\text{Given that,}\\\\\text{Pressure,}~ P = 1.99~ \text{atm}\\ \\\text{No. of moles,}~ n = 0.182~ \text{mol.}\\\\\text{Temperature,}~ T = 83.4^{\circ}~ C = 356.4~K\\\\ \text{Molar gas constant,}~ R = 0.082~ \text{L}~ \text{atm}~ \text{mol}^{-1}~ \text{K}^{-1}\\\\\text{Volume,}~ V =?\\\\\text{We know that,}~\\\\~~~~~~~PV =nRT\\\\\implies V = \dfrac{nRT}{P}\\\\\\~~~~~~~~~~=\dfrac{0.182 \times0.082 \times 356.4 }{1.99}\\\\\\~~~~~~~~~~\approx 2.68~ \text{L.}\\\\\\[/tex]
[tex]\text{Hence the volume of the gas is 2.68 L.}[/tex]
2.68L is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4°C.
What is volume?A measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected. In contrast to how much space the container actually occupies, the size of a container is typically thought of as its capacity, or the quantity of liquid it could hold.
Volume was initially measured using naturally occurring vessels of a comparable shape and then with standardised containers. Arithmetic formulas can be used to quickly calculate the volume of several straightforward three-dimensional shapes. If a formula again for shape's boundary is known, it is possible to use integral calculus to determine the volumes of more complex shapes.
P×V = n×R×T
V=n×R×T /P
=0.182 ×0.082×356.4 /1.99
=2.68L
Therefore, 2.68L is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4°C.
To know more about volume, here:
https://brainly.com/question/23477586
#SPJ2
How does engineering affect the amount of human labor needed to harvest rice?
Answer:
Yes
Explanation:
The first step of harvesting is draining the paddy. Next, farmers cut the plants -- with a scythe or sickle if by hand -- and transport them elsewhere to be laid out and dried for two or three days. Rice can be cut by hand or machine. In the developed world, harvesting by hand is still very common.
Compare the temperature change for cold sand and cold water when the same amount of hot water was added. what do you discover?
When the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.
What is specific heat capacity?Specific heat capacity is the quantity of heat required to raise a unit mass of a substance by 1 kelvin.
Specific heat capacity of water and sandWater, c = 4,200 J/kg⁰C
Sand, c = 830 J/kg⁰C
Q = mcΔθ
where;
Δθ is temperature changeQ is quantity of heat addedΔθ = Q/mc
Thus, for an equal mass of water and sand, when the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.
Learn more about specific heat capacity here: https://brainly.com/question/21406849
#SPJ1
Answer:t
Explanation:
What errors did the chemistry teacher make in planning to this demonstration and how could checking her work have made a difference?
*THERE ARE A TOTAL OF 4 ERRORS* NEED HELP ASAP BEFORE 11:59 PM
With the hope of sharing an explosive combustion reaction demonstration in class
for her students, a chemistry teacher decides to synthesize water. This process
occurs when oxygen gas (O₂) in the air is combined with hydrogen gas, H₂, in the
presence of a spark or small flame. Like the reactants, the water (H₂O) product is
also a gas.
She knew she didn't want the demonstration to create too much water product,
only 180.0 grams.
Since the oxygen reactant is abundantly present in the air, she needed only to
determine how much hydrogen gas to prepare before class.
She used the following chemical equation to make her predictions:
O2(g) + H2(g) → H₂O(g)
The teacher used have used standard temperature and pressure values in her calculations of volume of hydrogen gas required.
What is the equation for the synthesis of water?The equation for the synthesis of water is given below as follows:
[tex]2 H_2 + O_2 \rightarrow 2H_2O[/tex]
Based on the planned steps of the synthesis of hydrogen gas by the teacher, the following errors were committed by the teacher:
She used temperature in degrees Celsius for her calculations She used the mass of water required instead of moles of water in her calculation using the ideal gas equation She did not use standard temperature and pressure measurement in her calculations She used an unbalanced chemical equation for her calculationTherefore, in calculation molar volume of gases, the measurements should be taken at standard temperature and pressure values.
Learn more about molar gas volume at: https://brainly.com/question/15026766
#SPJ1
What can you determine about the feasibility of a reaction if the enthalpy is positive and
the entropy is positive?
A. The Gibbs energy will always be positive, and the reaction will never be feasible.
B. The Gibbs energy will always be negative, and the reaction will always be feasible.
OC. The reaction could be feasible above a certain temperature.
D. The reaction will usually occur because it is unlikely the entropy will be greater than the enthalpy.
Reset Selection
If the enthalpy is positive and the entropy is positive, the Gibbs energy will always be positive, and the reaction will never be feasible.
What is the Gibbs Free Energy?The Gibb Free Energy is used to obtain the feasibility of a reaction. If the Gibbs free energy is positive the reaction is not spontaneous. If the value is negative, the reaction is spontaneous while a zero values indicates equilibrium.
From the equation;
ΔG = ΔH - TΔS, it follows that if the enthalpy is positive and the entropy is positive, the Gibbs energy will always be positive, and the reaction will never be feasible.
Learn more about Gibbs Free energy:https://brainly.com/question/20358734
#SPJ1
please ill mark u brilliant
+ 10 points
Name all these please I need help. Write the names of the fallowing accoring to the IUPAC rules.
#1
You used red pen highlight which made things messier
The correct name should be.
9-methyl dec-1,2-dieneAs a methyl group attached with 9th carbon
#2
methyl group at 4
double bond at 2
4-Methyl Pent-2-ene#3
Three methyl groups are present
Double bond at 2
2,5,5-Trimethyl Hex-2-ene#4
2,5-Dimethyl Hept-3,5-diene#5
2,5-Dimethyl Hex-3-ene
Match the following
1. coefficient
2. law of conservation of mass
3. product
4. reactant
the number written in front of a
chemical symbol in an equation
principle that during a chemical
reaction the total mass of the system is
unchanged
the substance made in a chemical
reaction
the starting material in a chemical
reaction
The order would be coefficient, law of conservation of mass, products, and reactants respectively.
Word matchingThe number written in front of a chemical symbol in an equation is called a coefficient.
The total mass of a system being unchanged is known as the law of conservation of mass
The substances made in chemical reactions are called products.
The starting materials in chemical reactions are called reactants.
More on reactions can be found here: https://brainly.com/question/17434463
#SPJ1
Select the correct answer from each drop-down menu. a 126.1-gram block of granite at 92.6°c is dropped into a tub of water at 24.7°c in an isolated system. the final temperature of both the granite and the water is 51.9°c. the specific heat capacity of granite is 0.795 joules/gram degree celsius, and the specific heat capacity of water is 4.186 joules/gram degree celsius. the granite block transferred of energy, and the mass of the water is .
Taking into account the definition of calorimetry, the mass of water is 35.70 grams.
What is calorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m.c is the specific heat substance c. ΔT is the temperature variation.Mass of water in this caseIn this case, you know:
For granite:
Mass of granite= 126.1 gInitial temperature of granite= 92.6 °CFinal temperature of granite= 51.9 ºCSpecific heat of granite = 0.795 [tex]\frac{J}{gC}[/tex]For water:
Mass of water = ?Initial temperature of water= 24.7 ºCFinal temperature of water= 51.9 ºCSpecific heat of water = 4.186 [tex]\frac{J}{gC}[/tex]Replacing in the expression to calculate heat exchanges:
For gold: Qgranite= 0.795 [tex]\frac{J}{gC}[/tex] × 126.1 g× (51.9 °C - 92.6 °C)
For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)
If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:
- Qgranite = + Qwater
- 0.795 [tex]\frac{J}{gC}[/tex] × 126.1 g× (51.9 °C - 92.6 °C)= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)
Solving:
4,080.15465 J= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× 27.3 °C
4,080.15465 J= 114.2778 [tex]\frac{J}{g}[/tex]× mass of water
mass of water= (4,080.15465 J)÷ 114.2778 [tex]\frac{J}{g}[/tex]
mass of water= 35.70 grams
Finally, the mass of water is 35.70 grams.
Learn more about calorimetry:
brainly.com/question/11586486
brainly.com/question/24724338
brainly.com/question/14057615
brainly.com/question/24988785
#SPJ1
density is ______ to pressure
Answer:
When pressure increases, density increases.
When the pressure decreases, density decreases.
When density increases, pressure increases.
When density decreases, the pressure decreases.
Explanation:
what is the answer and why?
Answer:
D
Explanation:
There are 2 oxygens on the reactants side (OH)2 but 4 on the products side (2H2O). You cannot get 2 oxygens out of nowhere, so it is not balanced.
The diagram below shows three kettles with their powers and the time they take to boil 500cm3 of water. How much energy is transferred (in kilojoules, kJ) by the 1.4kW kettle while it boils the water?
The energy transferred is given as the product of power and time. The 1.4 kW kettle with boiled water produces 378 kJ of energy.
What is energy?Energy is the quantitative property that determines the work done by the body in the form of heat and light.
The image showing the kettles with time and power is attached below.
Given,
Power of the kettle = 1.4 kW
Time taken = 4.5 minutes
If power = energy ÷ time
Then, energy = power × time
= 1.4 × 0.075
= 0.105 KWh
Therefore, 0.105 kWh or 378KJ is the energy transferred.
Learn more about energy here:
https://brainly.com/question/16948772
#SPJ1