Answer:
The Answer is - (B)
Explanation:
I Just took the test on edg
This portion of the stratosphere if known as the _______.
A.
mesosphere
B.
tropopause
C.
thermosphere
D.
ozone layer
What mass of magnesium nitrate contains 500g of nitrate?
Answer:
98
Explanation:
I dont even know
Explain as to why two hydrogen form H2 molecule but not molecules such as H3, H4 etc..
Hydrogen is a diatomic gas with two atoms (di meaning two). H2 is referred to as molecular hydrogen because hydrogen atoms are covalently joined together to form a molecule.
Because two hydrogen molecules are connected to one other by a covalent connection, hydrogen is denoted as H2.
Hydrogen has only one electron, so to complete its duet(octet in case of nitrogen) it has to bond with another hydrogen molecule to be stable and also exist.
You can remember it like this :
H = element
H2 = gas
Other diatomic gases :
O2 (oxygen)
N2 (nitrogen)
Another word for oxidation is
Decaying
Rusting
Cutting
Burning
What does Gibbs free energy predict?
A. It predicts what the rate of the reaction will be.
B. It predicts how high the activation energy is.
C. It predicts if entropy will increase or decrease.
D. It predicts whether or not a reaction will be spontaneous.
Answer:
D. It predicts whether or not a reaction will be spontaneous.
Explanation:
What does Gibbs free energy (ΔG) predict? .
A. It predicts what the rate of the reaction will be. NO. ΔG is a thermodynamical parameter and it is not related to the kinetics of the reaction.
B. It predicts how high the activation energy is. NO. ΔG is a thermodynamical parameter and it is not related to the kinetics of the reaction.
C. It predicts if entropy will increase or decrease. NO. ΔG depends on the entropy but not the other way around.
D. It predicts whether or not a reaction will be spontaneous. YES. If ΔG < 0 the reaction is spontaneous and if ΔG > 0 the reaction is not spontaneous.
How many grams of aluminum is required to react with 75.0 ml of 2.50 M HCl?
Answer:
63 g Al is required to react with 35 mL of 2.50 M hydrochloric acid
I'm sorry if it's wrong, I tried.
Explanation:
A diagram representing the levels of organization within an organism is shown below.
Х
-5-
Which level of organization is dentified by X?
(1) cell
(2) tissue
(3) organ
(4) organ system
A diagram representing the levels of organization within an organism is X. The level of organization is identified by X is tissue. Therefore, option 2 is correct.
What is tissue ?The term "tissue" refers to a collection of cells or fluid that cooperate to carry out a particular function in the body. Examples of such cells include those found in the kidney, heart, or blood cells, which transport oxygen to and waste products away from the body's cells.
The Old French term tissue, which means "a ribbon, belt, or piece of woven stuff," is where the noun tissue originates. Tissue really means to "weave fabric strands" as a verb. Tissues are now thought of as the disposable paper used for packaging presents or blowing our noses.
They stand for a degree of cell differentiation and order in living things. The activities of tissues include respiration, digesting, and transportation. As a result, tissues are crucial for multicellular creatures.
Thus, option 2 is correct.
To learn more about tissue, follow the link;
https://brainly.com/question/17664886
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the coal sample being used in this experiment is assumed to have 3% sulfur in its composition. what percent of sulfate is present in the coal samples
Answer: The percent of sulfate is present in the coal samples is 0.999%.
Explanation:
Given: Percentage of sulfur present = 3%
In [tex]SO^{2-}_{4}[/tex], the percentage by weight of Sulfur is calculated as follows.
[tex]Percentage = \frac{32 g}{32 + 64} \times 100\\= 33.33 percent[/tex]
This means that the amount of only sulfur present in [tex]SO^{2-}_{4}[/tex] in the sample is as follows.
[tex]\frac{3}{100} \times 33.33\\= 0.999 percent[/tex]
Thus, we can conclude that percent of sulfate is present in the coal samples is 0.999%.
what type of chemical reaction is 2C₄H₁₀ + 13O₂ ---> 8CO₂ + 10H₂O?
Answer:
The answer is a combustion reaction.
Explanation:
This chemical equation is a combustion reaction because [tex]C_{4} H_{10}[/tex] is combining with oxygen, thus releasing a large amount of energy in the form of heat and light.
It is also a combustion reaction because the products of carbon dioxide and water are formed.
which sphere would this be found in?
Answer:
The answer you picked was right.
Explanation:
9 How many grams of O₂ are needed to produce 15.5 g Fe₂O3 in the following reaction? Fe(s) + O₂(g) → Fe₂O3 (s)
Answer:
Explanation:
so u can work out the amount of moles in FeO3 by doing mr of fe3o3 is 55.8*3+16*3=215.4
moles= mass/mr so you do 15.5g/215.4=0.0719 moles
then using 1 to 1 ratio so O2 moles is 0.0719
then use the equation mass=mole*mr
so 0.0719*16=1.15g
hope this make sense :)
The graph shows a relationship between volume and temperature. Which of the following statements is true?
A.) The graph shows a directly proportional relationship between volume and temperature and represents Charles' Law.
B.) The graph shows an indirectly proportional relationship between volume and temperature and represents Boyle's Law.
C.) The graph shows an indirectly proportional relationship between volume and temperature and represents Gay-Lussac's Law.
4.) The graph indicates that when temperature is increased, volume decreases.
Answer:
The graph shows a directly proportional relationship between volume and temperature and represents Charles' Law.
Explanation:
The relation between volume and temperature is given by :
Ideal gas law, PV = nRT
Where
P is pressure
V is volume
R is gas constant
T is temperature
As volume and temperature have direct relationship. Charles law states that there is a direct relationship between volume and temperature. The correct option is (a).
The energies of the bonds broken in a certain reaction are greater than the energies of the bonds formed. Which one of the following statements about this reaction must be true?
a. The reaction is endothermic.
b. The reaction is exothermic.
c. The reaction is spontaneous.
d. The reaction is non-spontaneous.
Answer:
a. The reaction is endothermic.
Explanation:
The heat involved in a chemical reaction is given by the enthalpy change (ΔH), which is equal to the balance between the chemical bonds that are broken (release energy) and the chemical bonds that are formed (need energy):
ΔH ≅ bonds broken - bonds formed
If broken bonds > bonds formed ⇒ ΔH > 0 ⇒ endothermic reaction
Therefore, the reaction is endothermic (it requires energy).
which is generally more soluble in water ammonium chloride or potassium chloride explain
Answer:
Ammonium chloride
Explanation:
because is a salt which is highly soluble in water than potassium
calculate total pressure on bodies under water surface?
Explanation: this is how to calculate pressure underwater, I'm not sure if it's what you're looking for.
FORMULA: P=hρg
The temperature of 10 kg of a substance rises by 55oC when heated. Calculate the temperature rise when 22 kg of the substance is heated with the same quantity of heat.
Answer:
The temperature rise is 25°C
Explanation:
The heat of a substance is obtained using the equation:
Q = m*S*ΔT
Where Q is heat in kJ, m is the mass of the susbtance, S is specific heat of the material and ΔT change in temperature.
Replacing:
Q/S = m*ΔT
As Q is constant because the heat is the same and S is the specific heat of the material (Constant). We can write:
m1*ΔT1 = m2*ΔT2
Where m is mass and ΔT change in temperature of 1, initial conditions of the substance and 2, final conditions of the substance.
Replacing:
m1 = 10kg
ΔT1 = 55°C
m2 = 22kg
ΔT2 = ?
10kg*55°C = 22kg*ΔT2
ΔT2 = 25°C
The temperature rise is 25°C
Given the following set of atoms, write a bond-line formula for a possible constitutional isomer for the compound. Show all formal charges and lone pairs.C atoms H atoms Other3 6 2 Br atoms
Answer:
Explanation:
Isomers are compounds with the same molecular formula but chemically distinctive structures. Compounds that vary in connectivity, or how the component atoms are related to one another, are known as constitutional isomers. They have distinct functional groups and bonding patterns according to the sequence in which the atoms are linked together.
From the information given:
The compound given is C₃H₆Br₂ and the constitutional isomer of the compound can be seen in the image attached below.
The formal charges are calculated as follows:
Formal charge = valence electron - 1/2(bonding electron) - lone electron
For Br:
Formal charge = 7 - 1/2(2) - 6
Formal charge = 7 - 1 - 6 = 0
For C:
Formal charge = 4 - 1/2(8) - 0
Formal charge = 4 - 4 = 0
For H:
Formal charge = 1 - 1/2(2)
Formal charge = 1 - 1 = 0
how many milliliters of 0.105 M HCL are needed to titrate 22.5 ml of 0.118 M NaOH to the equivalence point
3. 78 mL of 2.5 M phosphoric acid is neutralized with 500 mL of potassium hydroxide. What is the
concentration of the base?
Need some help with this Chem Question :)
Answer:
Mg + Fe(NO₃)₂ —> Fe + Mg(NO₃)₂
Explanation:
The activity series helps us to easily define whether or not a reaction will occur.
Elements at the top of the activity series are highly reactive and will always displace those at the bottom of the series in any reaction.
With the above information in mind, let us answer the questions given above.
Ag + NaNO₃ —> Na + AgNO₃
The above reaction will not occur because Na is higher than Ag in the activity series. Thus, Ag cannot displace Na from solution.
Pb + Mg(NO₃)₂ —> Pb(NO₃)₂ + Mg
The above reaction will not occur because Mg is higher than Pb in the activity series. Thus, Pb cannot displace Mg from solution.
Mg + Fe(NO₃)₂ —> Fe + Mg(NO₃)₂
The above reaction will occur because Mg is higher than Fe in the activity series. Thus, Mg will displace Fe from solution.
Cu + Mg(NO₃)₂ —> Cu(NO₃)₂ + Mg
The above reaction will not occur because Mg is higher than Cu in the activity series. Thus, Cu cannot displace Mg from solution.
From the above illustration, only
Mg + Fe(NO₃)₂ —> Fe + Mg(NO₃)₂
Will occur.
33. The compound C2H2 belongs to the series of
hydrocarbons with the general formula
A CH,
B C2 H2o
C. C,H2n-2
D. C2.H2n-2
Answer:D
Explanation:
A researcher accidentally spilled some sand into his beaker containing crystalline compound X. Knowing what he did about melting points, he was not worried about obtaining the melting point of compound X with a few grains of sand present. Why
Answer:
See explanation
Explanation:
If we look at the structure of X, we will discover that X is an organic compound. The compound will certainly have a much lower melting point than sand.
This is because, sand is composed of high melting point inorganic materials.
Hence, even though the researcher accidentally spilled some sand into the the beaker containing the crystalline substance X, he does not need to be perturbed since the melting point of X is much lower than that of sand
PLEASE ANSWER ASAP I WILL GIVE YOU BRAINLIEST AND GIVE FREEE POINTSSS AFTER
Describe each of the following types of reactions and give one example of each: combustion, synthesis, decomposition, single replacement, double replacement.
Explanation:
Combustion Reaction:-A kind of chemical reaction in which a reaction between any combustible substance and an oxidizer takes place in order to form an oxidized product.
Eg: Fuel + O2 → CO2 + H2O.
The burning of charcoal is a combustion reaction.
Synthesis Reaction:-A synthesis reaction occurs when two or more reactants combine to form a single product.
Eg: Na + Cl → NaCl
An example of a synthesis reaction is the combination of sodium (Na) and chlorine (Cl) to produce sodium chloride (NaCl).
Decomposition Reaction:-A decomposition reaction occurs when one reactant breaks down into two or more products.
Eg: NaCl → Na + Cl
An example of a decomposition reaction is the breakdown of Sodium chloride to give sodium and chloride.
Single Replacement Reaction:-A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound.
Eg: Zn + 2 HCl → 2 ZnCl + H2
The reaction between zinc metal and hydrochloric acid to produce zinc chloride and hydrogen gas is an example of a single-displacement reaction.
Double Replacement Reaction:-A double replacement reaction is a type of chemical reaction that occurs when two reactants exchange cations or anions to yield two new products.
Eg: AgNO 3 + NaCl → AgCl + NaNO
The reaction between silver nitrate and sodium chloride to produce silver chloride and sodium nitrate is an example of a double-displacement reaction.
presented by Machar
Phosphorus pentachloride decomposes according to the chemical equation
PCI (9) PCI, (g) + Cl, (9) K = 1.80 at 250 °C
A 0.3723 mol sample of PCI; (g) is injected into an empty 4.25 L reaction vessel held at 250 °C.
Calculate the concentrations of PCI; (g) and PCI, (9) at equilibrium.
[PCI) =
M
[PC1,1 =
M
Answer:
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What what I put to answer this?
How many molecules are contained in 52.5 moles of C2H8?
please explain if you can
Answer:
3.1621 × 10²⁵ molecules
Explanation:
From the given information:
Moles of C2H8 = 52.5 moles
number of moles = mass/molar mass
molar mass of C2H8 = (6 *2) + (1*8)
= 12 + 8
= 20 g/mol
∴
52.5 moles = mass of C2H8 / 20 g/mol
mass of C2H8 = 52.5 moles × 20 g/mol
mass of C2H8 = 1050 grams
Recall that;
1 mole = 6.023 × 10²³ molecules
∴ 52.5 moles of C2H8 = (52.5 × 6.023 × 10²³) molecules
=3.1621 × 10²⁵ molecules
What is the PH of a solution with a concentration of 5.2 x 10-8 M H3O?
Answer:
7.28Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ { H_3O}^{+}][/tex]
From the question we have
[tex]ph = - log(5.2 \times {10}^{ - 8} ) \\ = 7.28399[/tex]
We have the final answer as
7.28Hope this helps you
What is the molar mass of a substance
A) the mass in grams of one mole of a substance
B) the number of particles in one gram of a substance
C) the number of moles in one gram of a substance
D) the mass in grams of one particle of a substance
thank you :)
Answer:
A) the mass in grams of one mole of a substance.
Explanation:
The molar mass of a substance is the mass in grams of 1 mole of the substance. As shown in this video, we can obtain a substance's molar mass by summing the molar masses of its component atoms. We can then use the calculated molar mass to convert between mass and number of moles of the substance.
How much energy would it take to freeze 12.5 g of water?
The amount of energy needed to freeze 12.5 grams of water into ice is equals to 14.295 kilo joules.
How do we calculate energy?Energy required to freeze water will be calculated by using the following equation as:
Q = mcT, where
m = mass of water = 12.5g = 0.0125kg
c = specific heat of water = 4.187 kJ/kg.K
T = temperature to freeze = 0 degree C = 273.15 K
On putting values we get,
Q = (0.0125)(4.187)(273.15)
Q = 14.295 kJ
Hence required amount of energy is 14.295 kJ.
To know more about absorbed energy, visit the below link:
https://brainly.com/question/26306578
A gas mixture being used to simulate the atmosphere of another planet consists of 320 mg of methane, 175 mg of argon, and 225 mg of nitrogen. Th e partial pressure of nitrogen at 300 K is 15.2 kPa. Calculate (a) the volume and (b) the total pressure of the mixture.
Answer:
The total pressure is 61.4 kPa, and the volume is 1.31 L.
Explanation:
Based on the given information, a gas mixture comprising 320 mg or 0.320 grams of CH4, 175 mg or 0.175 grams of Ar, and 225 or 0.225 grams of N. The number of moles of the gases presents within the mixture can be determined by using the formula,
Number of moles = Mass/ molecular mass
The molecular mass of methane is 16.04 grams per mole, the molecular mass of Argon is 40 grams per mole, and the molecular mass of Nitrogen is 28.02 grams per mole.
Now, the number of moles of CH4 is,
= 0.320 grams/ 16.04 grams per mole
= 0.0199 moles
The number of moles of Ar is,
= 0.175 grams/40 grams per mole
= 0.0044 moles
The number of moles of N2 is,
= 0.225 grams/28.02 grams per mole
= 0.0080 moles
The partial pressure of nitrogen given is 15.2 kPa or 0.15 atm. Thus, the partial pressure of other two gases will be,
CH4 = (15.2 kPa) (0.0199 moles)/(0.0080 moles)
= 37.8 kPa
Ar = (15.2 kPa) (0.0044 moles)/(0.0080 moles)
= 8.36 kPa
Therefore, the total pressure is 15.2 + 37.8 + 8.36 = 61.4 kPa or 0.606 atm
The total volume can be determined by using the formula,
V = nRT/P
Here n is the total number of moles of the gas, which is 0.0323 moles.
Now putting the values we get,
V = (0.0323 moles) (0.0826 atm*L/mol*K)(300 K)/(0.606 atm)
V = 1.31 L
