Answer:
Q = -22.9 kJ
Explanation:
Given that,
Mass of water, m = 150.3 g
Water gets cool from 25.60°C to -10.70°C.
The specific heat of water, c = 4.2 J/g°C
The formula for heat needed is given by :
[tex]Q=mc\Delta T\\\\Q=150.3\times 4.2 \times (-10.7-25.6)\\\\Q=-22914.738\\\\or\\\\Q=22.9\ kJ[/tex]
So, 22.9 kJ of heat is needed to be removed to cool.
Potassium chlorate decomposes to produce potassium chloride and oxygen gas according to the balanced equation below. If 1.00 g of potassium chlorate decomposes, and 0.500 g of solid potassium chloride is collected, what is the theoretical yield of potassium chloride and the % Yield of potassium chloride
Answer: The theoretical yield of potassium chloride is 0.596 grams and the % Yield of potassium chloride is 83.9%
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} KClO_3=\frac{1.00g}{122.5g/mol}=0.008moles[/tex]
[tex]2KClO_3\rightarrow 2KCl+3O_2[/tex]
According to stoichiometry :
2 moles of [tex]KClO_3[/tex] produce= 2 moles of [tex]KCl[/tex]
Thus 0.008 moles of [tex]KClO_3[/tex] will produce=[tex]\frac{2}{2}\times 0.008=0.008moles[/tex] of [tex]KCl[/tex]
Theoretical yield of [tex]KCl=moles\times {\text {Molar mass}}=0.008moles\times 74.5g/mol=0.596g[/tex]
% yield = [tex]\frac{\text {Actual yield}}{\text {Theoretical yield}}\times 100=\frac{0.500g}{0.596g}\times 100\%=83.9\%[/tex]
The theoretical yield of potassium chloride is 0.596 grams and the % Yield of potassium chloride is 83.9%
Which material would conduct heat best?
А.Air
B.Copper
C.Wood
D.Rubber
Answer:
I believe the best answer is B. Copper.
Write the name for the acid H2 SO4 when it is dissolved in water.
Answer: Sulfuric acid
Explanation: hope this help! :)
46.0 mL sample of gas at 28.0°C and 748 torr. What volume would this gas
sample occupy at stp?
Answer:
2
Explanation:
how many moles are in 83 particles of sodium chloride?
Answer:
there are 1.4201927800478769 moles in 83 particles of sodium chloride. or 1.42 for short.
Explanation:
What evidence can be used to explain the type of mutualistic relationship present between the water buffalo and frog?
which type of neuron carries impulses from the brain?
Answer:
Using my searching skills, the answer is motor neurons.
Explanation:
Motor neurons carry impulses from the brain and spinal cord to muscles or glands.
Describe the cause and effect relationship between density and ocean currents.
Answer:
Differences in water density affect vertical ocean currents. Denser water tends to sink, while less dense water tends to rise. Other causes of currents include tides, rain, runoff, and ocean bottom topography. Topography is the surface features of a place. Ocean topography includes slopes, ridges, valleys, and mountains! All these things are found at the bottom of the ocean, and can influence currents.
The cause-and-effect relationship between density and ocean currents is the mixing and circulation are influenced by the density differences between the various layers of the water column.
What are ocean currents?The continuous, predictable, and directional movement of seawater known as ocean currents is caused by gravity and wind.
Ocean vertical currents are influenced by variations in water density. Less dense water tends to rise, while denser water sinks. Tides, rainfall, runoff, and the topography of the ocean bottom are additional causes of currents.
Thus, the mixing and circulation are influenced by the differences in densities between the various layers of the water column, which is the cause-and-effect relationship between density and ocean currents.
To learn more about ocean currents, refer to the below link:
https://brainly.com/question/1543125
#SPJ2
One of the methods that scientists can use to determine the toxicity of a chemical compound is to perform a dose-response analysis.
a. True
b. False
Answer:
a. True
Explanation:
Hello there!
In this case, since the dose-response method is crucial concept in toxicology as it exhibits the result of exposures to toxic chemical compounds with changes in body functions or health, this statement is a. True , as this analysis is understood by means of the relationship -the higher the dose, the more severe the response-, and of course, it is based on observed data from controlled experiments in animal, human clinical, or cell studies, in the light of the determination of the toxicity of the analyzed chemical.
Regards!
Which statement can be made about the above passage
Answer:
Explanation:
whats the qustion?
in which location are there no changes in season
a north pole
B South Pole
C equator
D antártica
Answer: I'm going to say it's Antartica because the only seasons it have is summer and winter and it doesn't change.
Explanation:
4NH3 + 502 --> 4NO + 6H20
How much excess reactant is leftover after if 6.30g of ammonia react with
1.80g of oxygen?
Answer:
5.52 g
Explanation:
4NH₃ + 5O₂ → 4NO + 6H₂OFirst we convert the given masses of both reactants into moles, using their respective molar masses:
6.30 g NH₃ ÷ 17 g/mol = 0.370 mol NH₃ 1.80 g O₂ ÷ 32 g/mol = 0.056 mol O₂Now we calculate with how many NH₃ moles would 0.056 O₂ moles react, using the stoichiometric coefficients:
0.056 mol O₂ * [tex]\frac{4molNH_3}{5molO_2}[/tex] = 0.045 mol NH₃As there more NH₃ moles than required, NH₃ is the excess reactant.
Then we calculate how many NH₃ moles remained without reacting:
0.370 mol NH₃ - 0.045 mol NH₃ = 0.325 mol NH₃Finally we convert NH₃ moles into grams:
0.325 mol NH₃ * 17 g/mol = 5.52 gexplain the effect of the coil of wire after it has been charged by the batteries
Suggest two observations that would be made when rubidium is added to cold water.
Answer:
1. Rubidium metal reacts very rapidly with water to form a colorless basic solution of rubidium hydroxide (RbOH) and hydrogen gas (H2).
2. Rubidium sinks because it is less dense than water. It reacts violently and immediately, with everything leaving the container. Rubidium hydroxide solution and hydrogen are formed.
help out here plzzzzzzzzzzzzz
Answer:
Chromosomes are duplicated in the "s phase" of interphase.
A chemist mixed two substances together: a blue powder with no smell and a colorless liquid with a strong smell. Their repeating groups of atoms are shown above on the left. After they were mixed, the chemist analyzed the results and found two substances. One ending substance had the repeating group of atoms shown above on the right. Is the ending substance the same substance as the blue powder? What happened to the atoms of the starting substances when the ending substances formed? Be sure to explain your answers to both of these questions.
Answer:
fouse the fact sheet it helps more
ASAP PLEAE ANSWER I NEED HELP ITS OVERDUE what’s the definitions?
Answer:
Eclipse: 3. To vanish
Corona: 2. During a solar eclipse, the moon covers the sun, a small ring of fire is visible around the edge
Umbra: 4. The inner, darkest, cone-shaped shadow is
Penumbra: 1. The outer, larger, lighter shadow
Answer:
I found 3. 2. 4. and 1.
Explanation:
I got my answer from this website https://eclipse.aas.org/eclipse-america/eclipse-glossary
What heats up faster but loses heat faster?
-Water
-Air
Or
Land
the exact position of the electrons of an atom cannot be determined because they are in constant ___
When a system is at equilibrium, ________. When a system is at equilibrium, ________. the reverse process is spontaneous but the forward process is not the forward and the reverse processes are both spontaneous both forward and reverse processes have stopped the forward process is spontaneous but the reverse process is not the process is not spontaneous in either direction
Answer:
When a system is at equilibrium, the process is not spontaneous at either direction.
Explanation:
The process is not spontaneous at either direction , when a system is at equilibrium ΔG = 0, because -
We know that a negative ΔG indicates a forward-moving phase that is random.
We already know that a positive ΔG implies a non-spontaneous phase going forward.
Thus , here ΔG = 0, so the process is not spontaneous in either direction.
Arrange the following in order of increasing bond strength of the carbon oxygen bond: Group of answer choices Carbon monoxide < carbon dioxide < carbonate ion Carbonate ion < carbon monoxide < carbon dioxide Carbon dioxide < carbon monoxide < carbonate ion Carbon dioxide < carbonate ion < carbon monoxide carbonate ion < carbon dioxide < carbon monoxide Carbon monoxide < carbonate ion < carbon dioxide Carbonate ion < carbon monoxide < carbon dioxide
Answer:
carbonate ion < carbon dioxide < carbon monoxide
Explanation:
Bond strength depends on the bond order of a bond. The higher the bond order, the greater the bond strength since shorter bonds are stronger than longer bonds.
The carbonate ion has a bond order of 1.33, carbon dioxide has a bond order of 2 while carbon monoxide has a bond order of 3.
Since the compound with the highest C-O bond order has the strongest C-O bond, then carbon monoxide possesses the strongest C-O bond.
Answer: carbonate ion < carbon dioxide < carbon monoxide
Explanation: Carbon dioxide (chemical formula CO2) is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature, and as the source of available carbon in the carbon cycle, atmospheric CO2 is the primary carbon source for life on Earth. In the air, carbon dioxide is transparent to visible light but absorbs infrared radiation, acting as a greenhouse gas. Carbon dioxide is soluble in water and is found in groundwater, lakes, ice caps, and seawater. When carbon dioxide dissolves in water, it forms carbonate and mainly bicarbonate (HCO−3), which causes ocean acidification as atmospheric CO2 levels increase. Bond strength depends on the bond order of a bond. The higher the bond order, the greater the bond strength since shorter bonds are stronger than longer bonds. The carbonate ion has a bond order of 1.33, carbon dioxide has a bond order of 2 while carbon monoxide has a bond order of 3. Since the compound with the highest C-O bond order has the strongest C-O bond, then carbon monoxide possesses the strongest C-O bond. It is a trace gas in Earth's atmosphere at 421 parts per million (ppm), or about 0.04% by volume (as of May 2022), having risen from pre-industrial levels of 280 ppm. Burning fossil fuels is the primary cause of these increased CO2 concentrations and also the primary cause of climate change.
need this ASAP
Which of these must be FALSE, in order for evolution by natural selection to occur?
A. Variation between individuals exists in a population.
B. Particular variations of traits are passed on from one generation to the next.
C. Resources are limited, leading to competition within the population.
D. The particular traits present in one generation have no effect on traits in the next generation.
thank you :D
(giving brainiest) solve please! dont copy I've looked up everything ill know if you copied something!
Answer:
Precipitation falls in liquid and solid
Evaporation changes liquid water to gas
Explanation:
Precipitation exists in snow, rain, sleet, many forms liquid or solid but NOT gas.
Evaporation is from a liquid to a gas change, also called vaporization.
arrow futhermost to left is evaporation (rising into air)
arrow futhermost to right is precipitation ( falling back to ground)
hope this helped xxx please mark brainliest
PLS HELP AND ANSWER QUICK PLZ HELP
Answer:
i tried
Explanation:
1-A divergent boundary occurs when two tectonic plates move away from each other
2-A transform plate boundary occurs when two plates slide past each other
3-A convergent boundary is when two plates come together
4- I don't know
anyone know the name of this structure please
The electron affinity of an element is positive if energy is absorbed during the process of accepting an electron and negative if energy is released during the process. Using the electron configuration of the atom or ion undergoing the addition of an electron, predict whether the electron affinity will be positive or negative for the following reactions, and classify them accordingly.
Atom or ion Electron configuration
Ne 1s22s22p6
Br 1s22s22p63s23p64s23d104p5
Na 1s22s22p63s1
Mg 1s22s22p63s2
Cl 1s22s22p63s23p6
Answer:
See explanation
Explanation:
Ne is a noble gas. It already has an octet of electrons hence, the electron affinity of neon is negative.
Br is a halogen, halogens need one electron to complete their octet. The electron affinity for bromine is negative.
Sodium is a metal that has only one electron in its outermost shell. The electron affinity of sodium is positive.
Magnesium is a metal having two electrons in its outermost shell. The electron affinity of magnesium is positive.
Chlorine is another halogen, energy is released when an electron is added to chlorine hence the electron affinity of chlorine is negative.
Which of the following statements are true?
Question 1 options:
According to collision theory, any factor that can cause more collisions will increase the rate of reactions.
According to collision theory, factors can cause more collisions, but will not change the rate of reactions.
According to collision theory, factors that can cause more collisions have less energies than the activation energy, thus will decrease the rate of reaction.
According to the collision theory, no factors can influence reaction rates.
Answer:
c
Explanation:
factor can cause more collision and increase the rate of reaction
which has a higher ionization energy magnesium or calcium?
Answer:
magnesium has a higher ionization energy because its radius is smaller. calcium has a higher ionization energy because it outermost sub-energy level is full. they have the same ionization energy because they have the same number of valence electrons.
Explanation:
hope this helps
Structure of benzylidene diacetate....
Explanation:
Benzal .....
Molecular Formula: C11H12O4
Write
a word equation for the reaction in which hydrogen and oxygen react to form water
Hydrogen + Oxygen → Water.