Answers
Answer:
Explanation:
Hello,
In this case, for the computation of the energy loss when the cooling process is carried out, we use the shown below equation:
Whereas we need the mass, specific heat and change in temperature of iron within the process. Thus, the only value we need is the specific heat that is 0.444 J/(g°C), therefore, we compute the heat loss:
Negative sign points out the loss due to the cooling.
Regards.
Related Questions
State and explain grahms law of diffusion
Use the following structures of amino acids to answer the questions below. Note that the difference in the structures (the side chains) is highlighted by gray shading.A student performed chromatography of the four amino acids and theresults were shown in the chromatogram below. If an anion exchangecolumn (column is positively charged) was used in a neutral buffer,assign each amino acid to the corresponding peak in the chromatogram.
1. Which statement describes the particles of an ideal gas, based on thekinetic molecular theory?* O There are attractive forces between the particles. O The particles move in circular paths. O The collisions between the particles reduce the total energy of the gas. О The volume of the gas particles is negligible compared with the total volume of the gas.
The escape velocity required for gas molecules to overcome the earth’s gravity and go off to outer space is 1.12 x 103m/s at 15oC. Calculate the molar mass of a species with that velocity.
Answers
Answer:
False
Explanation:
Magnesium is the element of second group and third period. The electronic configuration of magnesium is - 2, 8, 2 or
There are 2 valence electrons of magnesium.
Only the valence electrons are shown by dots in the Lewis structure.
As, stated above, there are only two valence electrons of magnesium, so in the Lewis structure, two dots are made around the magnesium symbol.
Given that the electronic configuration is:- .
Orbital s cannot accommodate 3 electrons and also in magnesium it has . Hence, the statement is false.
Answers
Answer:
1.4 g H₂O
Explanation:
In a reaction, the reactants are usually not present in exactstoichiometric amounts, that is, in the proportions indicated by the balanced equation. Frequently a large excess of one reactant is supplied to ensure that the more expensive reactant is completely converted to the desired product. Consequently, some reactant will be left over at the end of the reaction. The reactant used up first in a reaction is called the limiting reagent, because the maximum amount of product formed depends on how much of this reactant was originally present. When this reactant is used up, no more product can be formed.
B) increasing the temperature of the reactant.
C) adding a catalyst to the reaction.
D)adding more reactant
Answers
Answer:
C)
Explanation:
C) adding a catalyst to the reaction.
A- Each Compound contains only one element.
B- Compound can be classified as either heterogenous or homogenous.
C- A Compound has a defined ratio by mass of the elements that it contains
D- Compounds Vary in chemical composition depending on the sample size.
Answers
The following statements about compounds is true that a compound has a defined ratio by mass of the elements that it contains. Option C is correct.
A compound is a substance that is made up of two or more elements that are chemically bonded together. The elements in a compound are always present in a fixed ratio by mass. This means that no matter how much of the compound you have, the ratio of the elements will always be the same.
For example, water is a compound that is made up of hydrogen and oxygen. The ratio of hydrogen to oxygen in water is always 2:1 by mass. This means that no matter how much water you have, there will always be twice as much hydrogen as oxygen.
A compound can be classified as either homogeneous or heterogeneous, but not both. Homogeneous compounds have a uniform composition throughout, while heterogeneous compounds have different compositions in different parts of the sample. Compounds do not vary in chemical composition depending on the sample size. The chemical composition of a compound is always the same, regardless of how much of the compound you have. Option C is correct.
To know more about the Compounds, here
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Explanation:
A and D is the answer
Hope the answer is right
Answers
There is 65% of NaHCO3 in the sample.
The equation of the reaction is;
HA + NaHCO3 -----> NaA + CO2 + H2O
Amount of CO2 formed = mass/molar mass
mass of CO2 = 0.561 g/44 g/mol = 0.013 moles
From the balanced reaction equation;
1 mole of NaHCO3 yields 1 mole of CO2
0.013 moles of Na2CO3 yields 0.013 moles of CO2
Hence, mass of NaHCO3 in the sample = 0.013 moles × 84 g/mol = 1.092 g of NaHCO3
Percentage by mass of NaHCO3 = 1.092 g/1.68 g ×100/1
= 65%
Learn more: brainly.com/question/25150590
Answer:
63.75%.
Explanation:
The first step here is to write out the reaction showing the chemical reaction between the two chemical species. Thus, we have;
HA(aq) + NaHCO3 --------------> CO2(g) + H20(l) + NaA(aq).
Therefore, the mole ratio is 1 : 1 : 1 : 1 that is go say one mole of HA reacted with one mole of NaHCO3 to give one mole of CO2 and one .ole of NaA.
Hence, the number of moles of CO2 = mass/molar mass = 0.561/44 = 0.01275 moles.
Thus, the number of moles of NaHCO3 = number of moles of CO2 = 0.01275 moles.
Therefore, we have ( 0.01275 moles × 84 g/mol) grams = 1.071 g NaHCO3 in the mixture.
Therefore, the percent by mass of N a H C O 3 in the original mixture = 1.071/1.68 × 100 = 63.75%.
Answers
Explanation:
Hydrogen + Oxygen --> Water
(1) Write the balanced chemical equation describing this reaction using the lowest whole number coefficients.
2H2(g) + O2(g) ---> 2H2O(g)
(2) Identify the oxidizing agent and reducing agent.
Oxidizing agent = O (There is decrease in oxidation number from 0 to -2)
Reducing agent = H (There is increase in oxidation number form 0 to +1)
(3) Determine the number of electrons transferred in the balanced chemical equation
2H2(g) --> 4H+ + 4e- (4 hydrogen atom lost a single electron each)
O2 + 4e- --> 2O2- (Two oxygen gain 2 electrons each)
Total number of electrons transferred in the balanced chemical equation is 4.