Answer:
b - 385 j
Explanation:
how many carbons atoms are in propane?
A 360. g iron rod is placed into 750.0 g of water at 22.5°C. The water temperature rises to 46.7°C. What was the initial temperature of the iron rod?
Answer: The initial temperature of the iron was [tex]515^0C[/tex]
Explanation:
[tex]heat_{absorbed}=heat_{released}[/tex]
As we know that,
[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]
[tex]m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)][/tex] .................(1)
where,
q = heat absorbed or released
[tex]m_1[/tex] = mass of iron = 360 g
[tex]m_2[/tex] = mass of water = 750 g
[tex]T_{final}[/tex] = final temperature = [tex]46.7^0C[/tex]
[tex]T_1[/tex] = temperature of iron = ?
[tex]T_2[/tex] = temperature of water = [tex]22.5^oC[/tex]
[tex]c_1[/tex] = specific heat of iron = [tex]0.450J/g^0C[/tex]
[tex]c_2[/tex] = specific heat of water= [tex]4.184J/g^0C[/tex]
Now put all the given values in equation (1), we get
[tex]-360\times 0.450\times (46.7-x)=[750\times 4.184\times (46.7-22.5)][/tex]
[tex]T_i=515^0C[/tex]
Therefore, the initial temperature of the iron was [tex]515^0C[/tex]
When is a scientific theory formed?
Answer:
when enough information is given to support a hypothesis (more info below)
Explanation:
If enough evidence accumulates to support a hypothesis, it moves to the next step known as a theory in the scientific method and is accepted as a valid explanation of a phenomenon. Tanner also explained that scientific theory is the framework for observations and facts.
hope I helped!
The reaction nC2H4 + (-C2H4-)n is
an
example of
1.
saponification
2.
esterification
3.
polymerization
4.
fermentation
Answer:
Polymerization
Explanation:
Polymerization is the process by which molecules of small organic compounds combine repeatedly, in a regular manner, to form a complex organic compound. These small organic repeated units are called monomers, while the complex product formed are referred to as polymer.
In this reaction,
nC₂H₄ + -(C₂H₄-)n is the combination of smaller units of C₂H₄(ethene) to form larger units of (C₂H₄)n (polyethene).
Polyethene is formed due to addition polymerization which is the process where ethene break their double bonds to form links, so that the empirical formula of both are the same. This occurs in a chain reaction and the process is known as polymerization.
6.0 L of oxygen gas is at a temperature of 5K. If the temperature of the gas is lowered to 1K at constant pressure, what is the new volume of the gas?
Answer:
THE NEW VOLUME AT 1 K IS 1.2 L
Explanation:
Using Charles' law which states that the volume of a given gas is directly proportional to its temperature provided the pressure remains constant.
Mathematically written as;
V1/T1 = V2/T2 at constant pressure
V1 = Initial volume = 6L
T1 = initial temperature = 5K
T2 = Final temperature = 1K
V2 = final volume = unknown
Re-arranging the equation by making V2 the subject of the equation, we obtain;
V2 = V1 T2 / T1
V2 = 6 * 1 / 5
V2 = 1.2 L
The new volume of the gas sample at 1 K is 1,2 L
Answer:1.2 L
Explanation: according to Charles law, the volume of a fixed mass of gas is directly proportional to it's temperature.
Volume is the size of the space that a gas occupies and it can be measured in liters, cubic meters, cubic decimeters etc.
The solution to this question is in the attached photo
Name the elements present in a) zinc sulphide b) sodium oxide
Answer:
a) zinc, sulphur, oxygen
b) sodium, oxygen
How many grams of water can be formed when 80 grams of sodium hydroxide (NaOH) reacts with an excess of sulfuric acid, H2SO4, in solution?
2NaOH + H2SO4 --> Na2SO4 + 2H2O
_____ grams water
Answer:
36g of H2O.
Explanation:
We'll begin by writing the balanced equation for the reaction:
2NaOH + H2SO4 —> Na2SO4 + 2H2O
Next, we shall determine the mass of NaOH that reacted and the mass of H2O produced from the balanced equation. This is illustrated below:
Molar mass of NaOH = 23 + 16 + 1 = 40g/mol
Mass of NaOH from the balanced equation = 2 x 40 = 80g
Molar mass of H2O = (2x1) + 16 = 18g/mol
Mass of H2O from the balanced equation = 2 x 18 = 36g.
From the balanced equation above, we can see evidently that:
80g of NaOH reacted to produce 36g of H2O.
When a piece of sodium carbonate reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then the solution turns milky and a white precipitate Y is formed a. Write the chemical formula of X, Y and (3)b. Write the chemical name of compound Y c. What is the nature of solution of sodium carbonate salt. Acidic salt or basic salt?
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
What is the upward force on objects in a fluid
Answer:It is upthrust...
Explanation:I don't say u must have to mark my ans as brainliest but if it has really helped u plz don't forget to thank me my friend....
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.
Which of the following are always the same for atoms of the same element?
Mass of an atom
Atomic number
Neutron number
Mass number
The atomic number remains the same for all atoms of the same element.
The atom is composed of;
ElectronsProtonsNeutronsThe electrons are found in the orbit while protons and neutrons are found in the nucleus of the atom.
The number of protons in an atom is its atomic number. It is the identity of an element. All atoms of the same element must have the same atomic number even though they may differ in mass number.
Learn more: https://brainly.com/question/803445
which one of the ff is correct about Acids?
a,acids have bitter taste
b,acids have HP value of less than 7
c,acids have POH value of less than 7
d,all are correct
Answer:
b acid have ph less than 7
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."
Question 3 of 6
Which set of coefficients correctly balances the following chemical equation?
C4H603 + H20 = C2H4O2
(1 point)
A. 1, 1, 1 (already balanced)
B. 1, 1, 2
C. 1, 2,1
D. 2, 2, 1
E. 2, 1, 2
Answer:
B. 1, 1, 2
General Formulas and Concepts:
Chemistry - Reactions
Balancing ReactionsReaction PredictionExplanation:
Step 1: Define
RxN: C₄H₆O₃ + H₂O → C₂H₄O₂
Step 2: Balance
We need the same amount of Carbons on both sides (4)C₄H₆O₃ + H₂O → 2C₂H₄O₂
We see that we have balanced everything at this point.
Please help! Don't forget to add your answer in kJ
Answer:
The answer to your question is given below.
Explanation:
The equation for the reaction is given below:
2H2O —> 2H2 + O2... ΔH = –572KJ
A. The reaction is exothermic since the enthalphy change, ΔH has a negative sign.
B. Since the enthalphy change, ΔH has a negative sign for the reaction, It means heat has be released to the surroundings. Therfore, 86.4g will also release heat.
C. We'll begin by calculating the mass of H2O that reacted from the balanced equation.
Molar mass of H2O = (2x1) + 16 = 18g/mol
Mass of H2O from the balanced equation = 2 x 18 = 36g.
From the balanced equation above:
When 36g of H2O reacted, –572KJ of heat were released.
Therefore, 86.4g of H2O will react to release = (86.4 × –572)/36 = –1372.8KJ of heat.
Therefore, –1372.8KJ of heat is released.
The reaction below demonstrates which characteristic of a base? Upper C U upper S upper O subscript 4 (a q) plus 2 upper N a upper O upper H (a q) right arrow upper C u (upper O upper H) subscript 2 (s) plus upper N a subscript 2 upper S upper O subscript 4 (a q).
Answer:
The ability of a base to react with a soluble metal salt
Explanation:
The equation is given as;
CuSO4(aq) + NaOH → Cu(OH)2(s) + Na2SO4(aq)
A strong base (NaOH) can easily react with a soluble metal salt (CuSO4) and displace it.
The reaction between CuSO4 and NaOH is a double displacement reaction.
Answer:
The ability of a base to react with a soluble metal salt
Explanation:
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
What is the volume of a 4.0M solution that contains 374 grams of KNO3?
Answer:
[tex]V_{solution}=0.925L=925mL[/tex]
Explanation:
Hello,
In this case, we should define what molarity is, being the ratio between the moles of the solute and the volume of the solution in litres:
[tex]M=\frac{n_{solute}}{V_{solution}}[/tex]
Thus, the first step is to compute the moles of potassium nitrate, whose molar mass is 101.1 g/mol as shown below:
[tex]n_{solute}=374g*\frac{1mol}{101.1g} =3.70molKNO_3[/tex]
Next, as we are asked for the volume of the solution we simply solve for it:
[tex]V_{solution}=\frac{n_{solute}}{M}=\frac{3.70mol}{4.0mol/L} \\\\V_{solution}=0.925L=925mL[/tex]
Regards.
Answer:
0.93L
Explanation:
The following data were obtained from the question:
Molarity = 4M
Mass of KNO3 = 374g
Volume =..?
We'll begin by calculating the number of mole in 374g of KNO3. This is illustrated below:
Mass of KNO3 = 374g
Molar mass of KNO3 = 39 + 14 + (16x3) = 101g
Number of mole of KNO3 =..?
Number of mole = Mass/Molar Mass
Number of mole of KNO3 = 374/101 = 3.70 moles.
Now, we can obtain the volume of the solution as follow:
Molarity = mole /Volume
Volume = mole /Molarity
Volume = 3.70/4
Volume = 0.93L
Therefore, the volume of the solution is 0.93L
pls say the 5 methods of preventing rusting of iron
Explanation:
Corrosion of iron is called as rusting. Rusting is oxidation of iron in the presence of oxygen and water and leads to formation of hydrated ferric oxide.
Methods to prevent rusting are :
1. Application of paint: It prevents the direct exposure of metal to atmosphere.
2. Application of oils or grease: It creates a barrier between the metal and atmosphere.
3. Galvanization : It is coating of iron with more active metal zinc so that zinc gets oxidized and protects iron.
4. Cathodic protection : It involves connecting iron to a more active metal which loses electrons on behalf of iron and thus protects iron by rendering it as cathode.
5. Coating with wax tapes: It prevents the direct exposure of metal to atmosphere.
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 :)
A) Cuantas fases tiene una ensalada de tomate y lechuga, un cafe con leche y un vaso de agua y aceite
B) Que tipo de sustancias son(Simple o compuesta).
Answer:
A)
A salad made of tomatoes and lettuce has two phases.Coffee with milk has one phase.A glass of water and oil has two phases.B) They are all compound substances
Explanation:
The salad and the glass of water with oil have two phases because their elements do not mix, we can see them separately. In the case of coffee with milk, there is only one phase because we can not see all the components separately, they are mixed in the solution.
They are all compound substances due to the fact that they are made of more than one element.
_______ 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:
How many grams of iron can be produced from 3.65g of Iron (III) Sulfate? 3Mg + Fe2(SO4)3 --> 3MgSO4 + 2Fe
A. 1.02g Fe B. 5.41g Fe C. 0.548g Fe D. 7.56g Fe
Answer:
Option A. 1.02g of Fe.
Explanation:
Step 1:
The balanced equation for the reaction.
3Mg + Fe2(SO4)3 —> 3MgSO4 + 2Fe
Step 2:
Determination of the mass Fe2(SO4)3 that reacted and the mass of Fe produced from the balanced equation. This is illustrated below:
Molar Mass of of Fe2(SO4)3 = (2x56) + 3[32 + (16x4)] = 112 + 3[32 + 64] = 112 + 3[96] = 400g/mol
Mass of Fe2(SO4)3 from the balanced equation = 1 x 400 = 400g
Molar Mass of Fe = 56g/mol
Mass of Fe from the balanced equation = 2 x 56 = 112g
From the balanced equation above,
400g of Fe2(SO4)3 reacted to produce 112g Fe.
Step 3:
Determination of the mass of Fe produced by reacting 3.65g of Fe2(SO4)3.
This is illustrated below:
From the balanced equation above,
400g of Fe2(SO4)3 reacted to produce 112g Fe.
Therefore, 3.65g of Fe2(SO4)3 will react to produce = (3.65 x 112)/400 = 1.02g of Fe.
Therefore, 1.02g of Fe is produced from 3.65g of Fe2(SO4)3.
5. A filled balloon has a volume of 5.6 L at 25 ˚C and it is placed into liquid nitrogen at a temperature of -78 ˚C. What is the new volume of the balloon?
HELP URGENT HELP!!!!!!!!!!!!!! PLEASEEEEE
Answer: 200
Explanation:
The answer is 200 kPa
What is the value of x in the equation below?
Answer: 7
Explanation: i don't know how the HECK. -3-(-8)-(-2)=7 but I searched it up soooooo also I got it right
name two gases which are supplied in compressed form in homes and hospitals ?
Answer:
lpg and oxygen are two gases which are supplied in compressed form in homes and hospitals
Explanation:
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
Help with this question
Answer:
I’ll help what’s the question
Explanation:
Answer:
Aight wats da question
Explanation:
