Answer:
it is 50%
Explanation:
62.9x50=3145
64.9x50=3245
3245+3145=6390
6390/100=63.9
PLEASE HURRT I NEED HELP ASAP !!!!!!!!!!!!!!
Answer:
I think its b
Explanation:
well because thermal energy its connected to kidnetic energy
Which model shows a molecule of a substance that is made up of three elements
Answer:
c or d
Explanation:
i tried a and it was wrong. its not B. and i cant see the rest. its the one that looks like a catipillar tho
Answer:
Its not A or B
Explanation:
What is O?
(A)Metal
(B)Metalloid
(C)Nonmetal
(D)None of the above
Answer:nonmetal
Explanation: gggg
.
As you move from left to right, the atomic number of each element increases
by
Answer:
Ionization Energy increases from left to right on the periodic table. Atomic radius decreases moving left to right on the periodic table.
Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell.
At 125 °C, 1 mol O₂ and 2 mol H₂ in a chamber have a total pressure of 3 atm. A current is run through the chamber, combining all the molecules into H₂O at constant volume. The pressure of the chamber, in atmospheres, is now:
Answer:
1.9998 atm
Explanation:
Balance the equation and then use PV=nRT to find the variable.
The final pressure of the chamber is 2 atm.
The given parameters;
Temperature of the gas, T = 125 ⁰CNumber of oxygen moles = 1Number of hydrogen moles, = 2Initial pressure of the gases, P₁ = 3 atmThe balanced chemical reaction of the given elements;
[tex]O_2 \ \ + \ 2H_2 \ \ ---> \ 2H_2O[/tex]
Initial number of moles of the gases, = 1 + 2 = 3 moles
Final number of moles of the product, = 2 moles
The final pressure of the chamber is calculated as follows;
[tex]PV = nRT\\\\\frac{P}{n} = \frac{RT}{V} \\\\\frac{P_1}{n_1} = \frac{P_2}{n_2} \\\\P_2 = \frac{P_1 n_2}{n_1} \\\\P_2 = \frac{3 \times 2}{3} \\\\P_2 = 2 \ atm[/tex]
Thus, the final pressure of the chamber is 2 atm.
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What will occur if two reactant molecules collide but do not have the right alignment?
Answer: Collision theory explains why different reactions occur at different rates, and suggests ways to change the rate of a reaction. Collision theory states that for a chemical reaction to occur, the reacting particles must collide with one another. The rate of the reaction depends on the frequency of collisions. The theory also tells us that reacting particles often collide without reacting. For collisions to be successful, reacting particles must (1) collide with (2) sufficient energy, and (3) with the proper orientation.
Molecules must collide before they can react
This rule is fundamental to any analysis of an ordinary reaction mechanism. It explains why termolecular processes are so uncommon. The kinetic theory of gases states that for every 1000 binary collisions, there will be only one event in which three molecules simultaneously come together. Four-way collisions are so improbable that this process has never been demonstrated in an elementary reaction.
Explanation:hope this helped
If two reactant molecules collide but do not have the right alignment then formation of product does not takes place.
What is collision theory?Collision theory states that if reacting particles frequently collide without reacting. Reacting particles must collide with sufficient energy and the right orientation for collisions to be successful.
So it the two reactant molecules collide with each other without proper orientation then it will not convert into products.
Hence formation of product will not takes place if reactant does not collide with right allignment.
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-
How many different sublevels are in the second energy level?
A. 2
B. 1
C. 4
D. 3
SI
Answer:
A: 2
Explanation:
Level one has one sublevel, whereas a Level two has two sublevels.
A mixture of nitrogen and xenon gases contains nitrogen at a partial pressure of 417 mm Hg and xenon at a partial pressure of 427 mm Hg. What is the mole fraction of each gas in the mixture
Answer:
0.4941, 0.5059
Explanation:
[tex]P_N[/tex] = Partial pressure of nitrogen = 417 mm Hg
[tex]P_{Xe}[/tex] = Partial pressure of xenon = 427 mm Hg
Total pressure in the system is given by
[tex]P=P_N+P_{Xe}\\\Rightarrow P=417+427=844\ \text{mm Hg}[/tex]
Mole fraction is given by
[tex]X_N=\dfrac{P_N}{P}\\\Rightarrow X_N=\dfrac{417}{844}\\\Rightarrow X_{N}=0.4941[/tex]
For xenon
[tex]X_{Xe}=1-0.4941=0.5059[/tex]
or
[tex]X_{Xe}=\dfrac{P_{Xe}}{P}\\\Rightarrow X_{Xe}=\dfrac{427}{844}\\\Rightarrow X_{Xe}=0.5059[/tex]
So, mole fraction of nitrogen is 0.4941 and xenon is 0.5059.
Calculate the pH of a solution with a [H 3 O + ]=5.6x10 -9 M.
Answer:
8.3
Explanation:
pH is the measure of the H+ or H30 (they r the same thing) ions in a solution. it is equal to -log[H+]. [H+]= Molar concentration of H+ ions.
Syrup used for hummingbird feeders is commonly 25% sucrose (C12H22O11) by mass. if you wish to make 1.0 kg of this soltion, what calculate the quantitity of sucrose and the quantitiy of water that you should use.
Calculate the molality (m) of the 25% sucrose solution in the question above,
The density 25% a sucrose solution at room temperature is 1.10 g/mL. calculate the molarity (M) of the 25% sucrose solutino.
Answer:
m
Explanation:
what is the funny number
666
Explanation:
nhgytfghgtfgv
When carbon dioxide is dissolved in an aqueous solution of sodium hydroxide, the mixture reacts to yield aqueous sodium carbonate and liquid water. Determine the net ionic equation for this process.
Answer:
CO + 2NaOH(aq) ---------- Na2CO3 + H2O
When carbon dioxide is dissolved in an aqueous solution of sodium hydroxide, the mixture reacts to yield aqueous sodium carbonate and liquid water. The net ionic equation is CO + [tex]2OH^{-}[/tex] → [tex]CO^{2-} _{3}[/tex]
What is the net ionic equation?The molecular formula for a process known as the net ionic equation only includes the species which are really involved in the reaction. In double displacement reactions, and redox reactions, including acid-base neutralization processes, the net ionic equation would be frequently employed.
When carbon dioxide is dissolved in an aqueous solution of sodium hydroxide, the mixture reacts to yield aqueous sodium carbonate and liquid water.
CO + 2NaOH → [tex]Na_{2} CO_{3} + H_{2}O[/tex]
The ionic equation can be written as:
CO + [tex]2Na^{+} + 2OH^{-}[/tex] → [tex]2Na^{+} + CO^{2-} _{3}[/tex]
Hence, the net ionic equation is CO + [tex]2OH^{-}[/tex] → [tex]CO^{2-} _{3}[/tex]
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If 8.500 g CH is burned and the heat produced from the burning is added to 5691 g of water at 21 °C, what is the final
temperature of the water?
The final temperature = 36 °C
Further explanationThe balanced combustion reaction for C₆H₆
2C₆H₆(l)+15O₂(g)⇒ 12CO₂(g)+6H₂O(l) +6542 kJ
MW C₆H₆ : 78.11 g/mol
mol C₆H₆ :
[tex]\tt \dfrac{8.5}{78.11}=0.109[/tex]
Heat released for 2 mol C₆H₆ =6542 kJ, so for 1 mol
[tex]\tt \dfrac{0.109}{2}\times 6542=356.539~kJ/mol[/tex]
Heat transferred to water :
Q=m.c.ΔT
[tex]\tt 356.539=5.691~kg\times 4.18~kj/kg^oC\times (t_2-21)\\\\t_2-21=15\rightarrow t_2=36^oC[/tex]
Does anybody know these questions ?
Answer:
proton 5
Explanation:
I think it is fluorine
Bromine (Br) has ____ valence electrons. When it forms an ionic bond, it _____ one electron and has a charge of _____
Answer:
7 valence e-, obtain e-, negative
how many grams of potassium sulfite (K2SO3) are required to dissolve in 872 g of water to make a 0.128M solution
Answer:
17.7
hope this helps
have a good day :)
Explanation:
17.7 g of potassium sulfite ([tex]K_2SO_3[/tex]) are required to dissolve in 872 g of water to make a 0.128M solution.
What is molality?It is a measure of the concentration of a solute in a solution in terms of the amount of substance in a specified amount of mass of the solvent
You're looking for the mass of potassium sulfite, [tex]K_2SO_3[/tex], needed to make a 0.128 m, or 0.128 molal, solution.
Now, molality is used to express the concentration of a solution in terms of how many moles of solute it contains per kilogram of solvent.
This means that in order to find a solution's molality, you need to know
the number of moles of solute and the mass of the solvent expressed in kilograms.
In your case, you already know the mass of the solvent in grams, so the very first thing to do here is to convert it to kilograms.
872 g = 0. 872 Kg.
Now, a 0.128 m solution contains 0.128 moles of solute per kilogram of solvent. Since your sample contains 0.872 kg of solvent, it follows that it will contain 0.1116 moles [tex]K_2SO_3[/tex].
All you have to do now is use the molar mass of potassium sulfite to figure out how many grams would contain that many moles:
0.1116 moles x 158.26 g =17.7 g
Hence, 17.7 g of potassium sulfite ([tex]K_2SO_3[/tex]) are required to dissolve in 872 g of water to make a 0.128M solution.
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compare the size of I, I+ and I-
umm explanation pls so i answee
A 11.1-g sample of granite initially at 76.0°C is immersed into 22.0 g of water initially at 22.0°C. What is the final temperature of both substances when they reach thermal equilibrium? (For water, Cs=4.18J/g⋅∘C and for granite, Cs=0.790J/g⋅∘C.)
Answer:
[tex]T_f=26.7\°C[/tex]
Explanation:
Hello.
In this case, when two substances at different temperature are placed in contact in an isolated container, we can say that the heat lost by the hot substance is gained by the cold substance. In such a way, since granite is at 76.0 °C and water at 22.0 °C we infer granite is hot and water is cold, so we write:
[tex]Q_{granite}=-Q_{water}[/tex]
In terms of mass, specific heat and change in temperature, we write:
[tex]m_{granite}C_{granite}(T_f-T_{granite})=-m_{water}C_{water}(T_f-T_{water})[/tex]
Thus, since the temperature is the same for both substance, we can solve for it as shown below:
[tex]T_f=\frac{m_{granite}C_{granite}T_{granite}+m_{water}C_{water}T_{water}}{m_{granite}C_{granite}+m_{water}C_{water}}[/tex]
By plugging in each variable, we obtain:
[tex]T_f=\frac{11.1g*0.790\frac{J}{g\°C} *76.0\°C+22.0g*4.18\frac{J}{g\°C} *22.0\°C}{11.1g*0.790\frac{J}{g\°C} +22.0g*4.18\frac{J}{g\°C}}\\\\T_f=26.7\°C[/tex]
Best regards!
Identify the common indicators that a chemical reaction has occurred.
a. A color change
b. A phase change
c. Precipitate being formed
d. A solid being dissolved
e. A change in temperature
f. Bubbles being produced
Answer:
a. A color change
c. Precipitate being formed
e. A change in temperature
f. Bubbles being produced
Explanation:
Two types of changes occur namely: physical changes and chemical changes. A physical change does not affect the chemical composition of the substance involved. Physical changes include change of state etc.
However, on the other hand, a chemical change alters the chemical composition of the substances involved, hence, leading to the formation of new product(s). It is also called a chemical reaction. Since a new product is formed from the alteration of the chemical nature of the reacting substances, the following changes or indicators will be present or evident in a chemical reaction:
- color change of substance
- Precipitate being formed i.e. solid deposit
- A change in temperature
- Bubbles being produced (evolution of gas)
Determine the molarity of 1.2 mol KCl in 1.1 L of a solution?
Answer:
1.1 M
General Formulas and Concepts:
Molarity = moles of solute / liters of solutionExplanation:
Step 1: Define variables
1.2 mol KCL
1.1 L of solution
M = unknown
Step 2: Solve for Molarity
Substitute: M = 1.2 mol/1.1 LEvaluate: M = 1.09091Step 3: Check
We are given 2 sig figs. Follow sig fig rules.
1.09091 M ≈ 1.1 M
Mineral reaction to stress
Answer:
Tenacity describes the reaction of a mineral to stress such as crushing, bending, breaking, or tearing. ... The majority of all minerals are brittle. An example is Quartz. (Minerals that are not brittle may be referred to as Nonbrittle minerals.)
what is the difference between metals and non metals?
Answer:
Metals shows the property of malleability while non-metals are non-malleable. Metals are generally those substances that have a shiny surface and thus are lustrous. Whereas non-metals have non-shiny appearance and thus falls under the category of non-lustrous substances.
Explanation:
hope the answer was helpful
Given that 10.00mL of 0.1894M CH3COOH was titrated with 0.2006M NaOH in this experiment, calculate the volume, in mL, of NaOH required
Answer:
[tex]V_{base}=9.442mL[/tex]
Explanation:
Hello!
In this case, when acetic acid is titrated with sodium hydroxide, the following chemical reaction is carried out:
[tex]CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O[/tex]
Whereas there is a 1:1 mole ratio between the acid and the base, which means that at the equivalence point we evidence:
[tex]n_{acid}=n_{base}[/tex]
Which in terms of volumes and concentrations is written as:
[tex]M_{acid}V_{acid}=M_{base}V_{base}[/tex]
Thus, solving for the required volume of base, we obtain:
[tex]V_{base}=\frac{M_{acid}V_{acid}}{M_{base}}=\frac{0.1894M*10.00mL}{0.2006M}\\\\ V_{base}=9.442mL[/tex]
Best regards!
What is the representative particle for boron?
The molecule is the representative particle of molecular compounds. It is also the representative particle of diatomic elements.
I hope this helps you, have a beautiful day ✨
The nurse discovers that one of her assigned clients is bleeding excessively from an abdominal incision. The nurse gives specific prescriptions to an unlicensed assistive personnel (UAP) to attend to the other clients and tells another nurse to call the primary health care provider immediately. In this situation, the nurse is implementing which leadership style?
trioxocarbonate iv acid
Answer:
Trioxocarbonate (iv) are salts derived from trioxocarbonate (iv) acid when it reacts with metals and metallic oxides. All trioxocarbonate (iv) salts of Sodium (Na), Potassium (K) and Ammonium(NH4+) are soluble while all others are insoluble.
What isotope does the model show? ASAP
1. lithium-6
2. lithium-7
3. beryllium-7
4. beryllium-4
Answer:
Lithium 7
Explanation:
An isotope is based off the number of neutrons present 3+4=7
Look on the periodic table to find the element number
need help thx if you take the time to help me out
Answer:
A is the only neutral atom there.
Explanation:
It consists of 6 atoms 6 neutrons and 6 electrons which means it is neutral. I am currently in chemistry.
Which of the following is an example of sp3 d2 hybridization?
A. C₂H6
B. PC15
C. 1F7
D. SFO
what the equipment of diffusion?
Answer:
liquid
a semi permeable membrane
oxygen
Explanation:
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