Answers
Answer:
4.5m/s
Explanation:
speed = distance/time
speed = 18/4
speed = 4.5m/s
Related Questions
Which of the following chemical equations violates the law of conservation of mass? (1 point) Li2SO4 + 2Ca(NO3)2 yields 2LiNO3 + 2CaSO4 Ti + 2Cl2 yields TiCl4 2C2H2 + 5O2 yields 4CO2 + 2H2O MgSO4 + 2NaOH yields Mg(OH)2 + Na2SO4
Calculate the pH of the solution formed when 45.0 mL of 0.100M NaOH solution is added to 50.0 mL of 0.100M CH3COOH (Ka for acetic acid = 1.8 x10-5 ).
Ammonium nitrate dissociates in water according to the following equation:43() = 4+()+03−()When a student mixes 5.00 g of NH4NO3 with 50.0 mL of water in a coffee-cup calorimeter, the temperature of the resultant solution decreases from 22.0 °C to 16.5 °C. Assume the density of water is 1.00 g/ml and the specific heat capacity of the resultant solution is 4.18 J/g·°C.1) Calculate q for the reaction. You must show your work.2) Calculate the number of moles of NH4NO3(s) which reacted. You must show your work.3) Calculate ΔH for the reaction in kJ/mol. You must show your work.
Is this the right answer lmk anyone? Please if you know!
Answers
Answer:
The temperature of the system once equilibrium is reached, is 292 Kelvin
Explanation:
Step 1: Data given
Mass of H2O = 34.05 grams
⇒ temperature = 273 K
Mass of H2O at 310 K = 185 grams
Pressure = 1 bar = 0.9869 atm
Step 2: Calculate the final temperature
n(ice)*ΔH(ice fusion) + n(ice)*CP(H2O)(Tfinal- Ti,ice) + n(H20)*CP(H2O)*(Tfinal-Ti,H2O) = 0
Tfinal = [n(ice)*CP(ice)*Ti(ice) + n(H2O)*CP(H2O)*Ti(H20) - n(ice)*ΔH(ice fusion)] / [n(ice)*CP(ice) +n(H2O)*CP(H2O)]
⇒ with n(ice) = moles of ice = 34.05 grams / 18.02 g/mol = 1.890 moles
⇒ with CP(ice) = 75.3 J/K*mol
⇒ with Ti(ice) = the initial temperature of ice = 273 K
⇒ with n(H2O) = the moles of water = 185.0 grams / 18.02 g/mol = 10.27 moles
⇒ with CP(H2O) = CP(ice) = 75.3 J/K*mol
⇒ with Ti(H2O) = the initial temperature of the water = 310 K
⇒ with ΔH(ice, fusion) = 6010 J/mol
Tfinal = [1.890 moles * 75.3 J/K*mol * 273 + 10.27 mol * 75.3 J/K*mol * 310 K - 1.890 moles * 6010 J/mol] / [1.890 moles *75.3J/k*mol + 10.27 mol * 75.3 J/K*mol]
38852.541 + 239732.61 - 11358.9 = 267226.251
Tfinal= 291.8 ≈ 292 Kelvin
The temperature of the system once equilibrium is reached, is 292 Kelvin
Final answer:
We must use the principle of conservation of energy to equate the heat gained by the ice to the heat lost by the water, in a given equation, to calculate the final equilibrium temperature.
Explanation:
The topic here is thermodynamics, specifically calculating the final equilibrium temperature when two substances are mixed. Given the information, we can apply the principle of conservation of energy, which in this context is the heat gained by one substance is equal to the heat lost by the other. In this case, the heat gained by the ice (H2O(s)) as it melts and increases in temperature is equal to the heat lost by the water (H2O(l)). Therefore, we have the equation 34.05 g * 1 kcal/kg * K *(T - 273 K) + 34.05 g * 80 Cal/g = 185 g * 1 kcal/kg*K *(310 K - T) where T is the final temperature to be solved.
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Answers
Answer:
Number of moles = 0.153 mol
Explanation:
Given data:
Mass of sulfur = 5 g
Number of moles of sulfur atom = ?
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of sulfur is 32. 065g/mol.
By putting values,
Number of moles = 5 g/ 32.06 g/mol
Number of moles = 0.153 mol
Answers
Answer:
1. Chromium
2. Chlorine.
3. Chlorine.
4. Chromium.
5. 12 electrons.
Explanation:
Hello,
In this case, the given reaction with the appropriate oxidation states turns out:
In such a way, the oxidation half-reaction is written for chromium as the reducing agent so it is oxidized from +3 to +6, nonetheless, since there are two chromiums undergoing such change, 6 electrons are being transferred as shown below:
On the other hand, chlorine's reduction half-reaction as the oxidizing agent result from the transfer of 6 electrons as well from +1 to 0, nonetheless, there are 6 chlorines undergoing such change:
Therefore, there are 12 electrons that are being transferred, 6 for chromium and 6 for chlorine.
Best regards.
Final answer:
In the given balance redox reaction, ClO- is the species being oxidized, CrO2- is the species being reduced. CrO2- also serves as the oxidizing agent, and ClO- serves as the reducing agent. A total of 6 electrons are transferred in this reaction.
Explanation:
In the given balanced redox reaction: 2CrO2- (aq) + 2H2O(l) + 6ClO- (aq) ⟶ 2CrO42- (aq) + 3Cl2(g) + 4OH- (aq), the species being oxidized is ClO- since it's gaining oxygen and losing electrons. The species being reduced is CrO2- since it's gaining electrons. The oxidizing agent, which is the substance that causes oxidation by accepting electrons, is CrO2-. The reducing agent, which causes reduction by losing electrons, is ClO-. The number of electrons being transferred in this reaction would be 6, as determined by balancing the half reactions for oxidation and reduction.
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Answers
Answer:
Explanation:
To solve this problem, we must use stoichiometry: the calculation of reactants and products in a chemical reaction using ratios.
1. Analyze the Reaction
Check the coefficients, which indicate the moles required for the reaction. 2 moles of sodium (Na) and 1 mole of chlorine (Cl₂) produces 2 moles of sodium chloride (NaCl).
2. Set Up Ratios.
We are asked to find the grams of NaCl produced when 0.548 moles of Na react with excess chlorine.
We need 2 ratios: 1 for finding the moles of NaCl produced and 1 for converting to grams.
The first ratio is found using the coefficients. Since there is excess chlorine, we only need to focus on the sodium and sodium chloride. According to their coefficients, 2 moles of Na produce 2 moles of NaCl. This is the first ratio.
The second ratio uses the molar mass. Since we are solving for the grams of NaCl, we have to find its molar mass.
First, locate these values on the Periodic Table for the individual elements.
- Na: 22.989769 g/mol
- Cl: 35.45 g/mol
There is 1 of each atom in 1 molecule, so we can add these values.
- NaCl: 58.439769 g/mol
Use this value as the second ratio.
3. Calculate
Make 1 expression using the 2 ratios and the initial value of moles.
Flip the ratios so the correct units cancel out.
Multiply. Note that the moles of Na (units) cancel and the moles of NaCl (units). cancel.
The original value of moles has 3 significant figures, so our answer must have the same. For the number we found, that is the tenth place.
- 32.02499341232
The 2 in the hundredth place tells us to leave the 0.
0.548 moles of sodium react with excess chlorine to produce 32.0 grams of sodium chloride.
Answers
Answer: The daughter nuclei is
Explanation:
Electron capture is defined as the process in which an electron is drawn to the nucleus where it combines with a proton to form a neutron and a neutrino particle.
The chemical equation for the reaction of electron capture of Zinc-63 nucleus follows:
The parent nuclei in the above reaction is Zinc-63 and the daughter nuclei produced in the above reaction is copper-63 nucleus.
Hence, the daughter nuclei is
Final answer:
When Zinc-63 undergoes electron capture, it results in the creation of a Copper-63 daughter nucleus. This is due to the atomic number decreasing by one (from 30 to 29) during electron capture, but the mass number remaining unchanged.
Explanation:
Electron capture is a process where a proton-rich nucleus absorbs an inner shell electron, which results in a conversion of a proton into a neutron, and the emission of an electron neutrino. In doing so, the atomic number decreases by one, while the mass number stays the same. Therefore, in the case of 63 Zn (zinc-63), the atomic number is 30 prior to electron capture. After electron capture, the atomic number will decrease by one to become 29, leading to the production of 63 Cu (copper-63).
Remember that the atomic number (bottom number), also known as the proton number, determines the element. Therefore, in our example, Zn changes to Cu. The fact that the mass number (top number) remains the same is due to the total number of protons and neutrons (nucleons) being conserved.
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b. Intermolecular forces become weaker
c. Intermolecular forces do not change
d. Energy increases
Engshus
ratoway
Answers
As the speed of the particles decreases, intermolecular forces become stronger. Thus, the correct option for this question is A.
What are Intermolecular forces?
The intermolecular forces may be defined as the forces of attraction. that is present between atoms, molecules, and ions when they are placed close to each other in order to form a compound or element. This force is continuously acting on the neighboring particles of different molecules.
It is found that at low temperature, when the speed of molecules/particles decrease, they migrate closer to one another that results in their intermolecular forces that become stronger as compared to the initial one.
As the attraction between molecules gradually increases, their movement decreases, and undergo fewer collisions between them.
Therefore, as the speed of the particles decreases, intermolecular forces become stronger. Thus, the correct option for this question is A.
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Answer:
B
Explanation: