How do elements differ going from left to right across a period on the periodic table?
please choose one
They become more valuable.
They become lighter.
They become more radioactive.
Their atomic number increases.
Hydrogen gas, oxygen gas, and water vapor are collected in eudiometer. The eudiometer contains 0.00206 g of hydrogen, 0.0811 g of oxygen, and 0.0151 g of water vapor. The total pressure is 1101.1 mmHg. Calculate the partial pressure (in mmHg) of hydrogen gas.
For the partial pressure in mmHg of hydrogen gas is mathematically given as
partial p = 257.81mmHg
What is the partial pressure in mmHg of hydrogen gas?Generally, the equation for the partial pressure is mathematically given as
partial p = mole of H2/total moles x total pressure
H2 =0.00206/2
H2 = 0.00103
O2 = 0.0811/32
O2 = 0.00253
H20 = 0.0151/18
H2O = 0.000839
total moles = 0.00103+0.000839+0.00253
total moles = 0.00439
therefore
partial p = 0.00103/0.00439 x 1101.1
partial p = 257.81mmHg
In conclusion, the partial pressure in mmHg of hydrogen gas is
partial p = 257.81mmHg
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A chemist is using a solution of hno3 that has a ph of 3.75. what is [h ] for the solution?
[tex]\text{pH} = -\log[H^{+}]\\\\\implies \log[H^{+}] = -\text{pH}\\\\\implies [H^{+}] = 10^{-\text{pH}}}\\\\\implies [H^{+}] =10^{-3.75}=0.00017~M[/tex]
Which of the following happens when a reaction reaches dynamic equilibrium in a closed system?
The concentrations of the reactants and products increase.
The concentrations of the reactants and products decrease.
The rate of the forward reaction equals the rate of the reverse reaction.
The rate of the forward reaction is slower than the rate of the reverse reaction.
Answer:
Option C
Explanation:
At equilibrium the reaction remains constantThe rate of forward reaction equals rate if backward reactionConcentration of products and reactants remains sameAnswer:
The rate of the forward reaction equals the rate of the reverse reaction.
Explanation:
10. What is a battery an example of?
a. load b. switch c. energy source d. conductor
Answer:
an energy source
Explanation:
As ocean water salt concentration increases, the _____.
Question 1 options:
water density increases and rises to the top of the sea.
water density increases and sinks to the bottom of the sea.
water density decreases and rises to the top of the sea.
water density decreases and sinks to the bottom of the sea.
Answer:
B water density increases and rises to the top of the sea
Explanation:
i took a test and got it correct lol
a gas has a temperature of 14C, and a volume of 4.5 liters. if the temperature is raised to 29C and the pressure is not changed, what is the new volume of the gas?
Answer: 4.7 L
Explanation:
how do you find the change in enthalpy on a potential energy diagram HELP MEEEE
LOL... I don't think my beautiful drawing helps a ton.
But basically in a potential energy diagram, the height distance between the reactants and products is the ∆H, aka the enthalpy change.
If the reactants are higher than products, then the reaction is exothermic.
If the products are higher than reactants, then the reaction is endothermic.
By what process does thorium-230 decay to radium-226?.
Answer:
alpha emission
Explanation:
27.2g CuCl2 was dissolved in 2.50 L of the water. What is the molality of the solution?
Answer:
0.0800 (on CK-12)
Explanation:
Given grams of CuCl2/molar mass of CuCl2
27.2g/134.45g=0.2023...
Next,
0.2023mol/2.50L = 0.0800
The molality of the copper(II) chloride (CuCl₂) solution is 0.081 mol/kg
MolalityMolality is a measure of the number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent
First, we will determine the number of moles of CuCl₂ present
Using the formula,
[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]
Mass of CuCl₂ = 27.2 g
Molar mass of CuCl₂ = 134.45 g/mol
∴ Number of moles of CuCl₂ present = [tex]\frac{27.2}{134.45 }[/tex]
Number of moles of CuCl₂ present = 0.2023 mole
Now, for the molality of the solution
Volume of solvent (water) = 2.50 L
Since the density of water = 1kg/L
Then, mass of the solvent (water) = 2.50 kg
[tex]Molality = \frac{Number\ of\ moles}{Mass\ of\ solvent}[/tex]
∴ Molality of the solution = [tex]\frac{0.2023}{2.50}[/tex]
Molality of the solution = 0.081 mol/kg
Hence, the molality of the solution is 0.081 mol/kg
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A current of 3.46 A is passed through a Sn(NO3)2 solution for 1.40 h . How much tin is plated out of the solution?
Answer:
About 10.7 grams.
Explanation:
The reduction reaction is represented by:
[tex]\displaystyle \text{Sn}^{2+}_\text{(aq)} + 2e^- \longrightarrow \text{Sn}_\text{(s)}[/tex]
A current of 3.46 amperes (C/s) is passed through the solution for 1.40 hours. The total amount of charge is hence:
[tex]\displaystyle 1.40\text{ hour} \cdot \frac{3600\text{ s}}{1\text{ hour}}\cdot \frac{3.46\text{ C}}{1\text{ s}} = 1.74\times 10^4\text{ C}[/tex]
One mole of solid Sn is transferred per two moles of electrons. Hence, using Faraday's constant:
[tex]\displaystyle 1.74\times 10^4\text{ C} \cdot \frac{1\text{ mol e$^-$}}{96485\text{ C}} \cdot \frac{1\text{ Sn}}{2\text{ mol e$^-$}}\cdot \frac{118.71\text{ g Sn}}{1\text{ mol Sn}} = 10.7\text{ g Sn}[/tex]
In conclusion, about 10.7 grams of tin is plated out of the solution.
15. What is the maximum pH an aqueous solution of 0.050 M Cu(NO3)2 can be adjusted to before a precipitate of Cu(OH)2 will form
The maximum pH an aqueous solution of 0.050 M Cu(NO3)2 is mathematically given as
pH=5.8
What is the maximum pH an aqueous solution of 0.050 M Cu(NO3)2 can be adjusted to before a precipitate of Cu(OH)2 will form?
Generally, the equation for the Chemical reaction is mathematically given as
Cu(OH)2----><---Cu^2 +2OH-
Therefore
s^2=1.0*10^{-19}
s=3.16*10^{=9}
{OH-}=2s=6.3*10^10^{-19}
{H+}=10^{-14}/OH
{H+}=1.58*10^{-6}
In conclusion
pH=-log(1.58*10^{-6}
pH=5.8
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Which economical systems do you most agree with and why
Answer:
be specific it's too little information
Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation: ()zn ()hcl → ()zncl2 ()h2
Based on the chemical equation, to balance the given equation we should use 2 as a coefficients of HCl on reacatnt side of the reaction.
What is balanced equation?Balanced chemical equations are those equation in which each entities are present in same amount on reactant side as well as on the product side of the chemical reaction.
Given chemical reaction is:
Zn + HCl → ZnCl₂ + H₂
In the above reaction equation is not balanced as number of chlorine and hydrogen atoms are not equal on both sides, so balanced equation will be:
Zn + 2HCl → ZnCl₂ + H₂
Hence we add 2 as a coefficient of HCl to balance the equation.
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Answer:
1 2 1 1
Explanation:
Is 18 karat gold a homogeneous mixture or heterogeneous mixture?
Answer:
Gold is an element. That means that it is the same all the way through and in an ideal state of purity contains nothing but gold atoms. Therefore it is not a mixture. In such a case it is as close to a uniform solid solution as may be, so it will be an homogeneous mixture.
Explanation:
really hope this helps :)
A d1 octahedral complex is found to absorb visible light, with the absorption maximum occurring at 509 nm. Calculate the crystal-field splitting energy, δ , in kj/mol
The crystal field theory accounts for the color of transition metal ions on the bases of splitting of d orbitals. The energy of the crystal-field splitting is 235kJ/mol.
What is crystal field splitting energy?The crystal field theory accounts for the color of transition metal ions on the bases of splitting of d orbitals. The energy of the spliting is obtained from the wavelength in the visible spectrum.
Now the wavelength is 509 nm hence the energy is obtained from;
E = 6.6 * 10^-34 * 3 * 10^8/509 * 10^-9 * 6.02 * 10^23/1 mol * 1/1000 kJ
= 235kJ/mol
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Why Do Onions Make You Cry? Even better, know how to prevent the tears.
Answer:
The onion cells release compounds into the air, and enzymes must follow up to alter amino acids into other compounds, causing irritation in the eye. To prevent, "crying" from an onion, try peeling the onion, then chilling the onion in the fridge for about 30 minutes. Otherwise, you can buy tearless onions.
What is the atomic symbol for an isotope with protons = 27 and atomic mass = 60?
Answer:
Cobalt (Co)
Explanation:
it has 27 protons and atomic mass of 60 in Cobalt 60 isotope
a balloon is filled with 2 liters of air at sea level, then a scuba diver carries it under the ocean. if the scuba diver stops when the pressure on the balloon is 3 atmospheres, what is the new volume of the balloon? round to the nearest hundredth.
A. 0.67 liters
B. 1.5 liters
C. 6 liters
D. 5 liters
Answer:
The correct answer is C. 6 Liters
Explanation:
You have to multiply the 2 liters by the atmospheres (which is 3) you get 6. six liters is the new volume.
A student wants to test an unknown chemical solution. What test should they perform to determine whether the chemical is an acid or base?
Or
Courtney wants to test an unknown chemical solution. What test should Courtney perform to determine whether the chemical is an acid or base?
A.
Test the solution by testing its conductivity
B.
Test the solution by increasing its temperature.
C.
Test the solution by tasting it.
D.
Test the solution's pH by using litmus paper.
The answer is D for whoever looked this up
Answer: D
Explanation:
The litmus paper will help determine the pH, and thus if it is an acid or a base.
Why does an aqueous solution of an ionic substance conduct an electric current?.
Answer:
Because ions in an aqueous solution are free to move independently from each other. the net flow of cations toward a negative or positive electrode results in a flow of charge, which is an electrical current.
Explanation:
S8(s) +
Cu(s) →
CuS(s)
Which formula(s) represent the reactant(s)?
Which formula(s) represent the product(s)?
Name the compound Cu2S.
What type of reaction is shown by the chemical equation?
Balance the chemical equation and write the coefficients in the space provided.
Answer:
Ox2 Cu03
Explanation:All from plato definetley correct
What is the origin of fahrenheit and centigrade temperature scales?.
Answer:
The 18th-century German physicist Daniel Gabriel Fahrenheit originally took as the zero of his scale the temperature of an equal ice-salt mixture
Explanation:
The esophagus is a _______________ that passes food from your mouth to your ____________________. The stomach is the organ that ____________________ digestive juices to break down food.
Answer:
The answer is Muscle, Stomach, chews or sucks.
Explanation:
These are the roles they play.
A student dissolves 15 grams
of salt in 250 mL of water.
What is the solute? What is
the solvent?
Answer:
salt is solute,water solvent, the mixture is the solition.
A student dissolves 15 grams of salt in 250 mL of water. The solute is salt and the solvent is water.
What is a solution?A solution is a homogeneous mixture of one or more solutes dissolved in a solvent.
solvent: the substance in which a solute dissolves to produce a homogeneous mixturesolute: the substance that dissolves in a solvent to produce a homogeneous mixtureFor solutions with components in the same phase, the substances present in lower concentration are solutes, while the substance present in highest abundance is the solvent.
Therefore, A student dissolves 15 grams of salt in 250 mL of water. The solute is salt and the solvent is water.
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If 25.0 g of NH₃ and 45.0 g of O₂ react in the following reaction, what is the mass in grams of NO that will be formed?
4 NH₃ (g) + 5 O₂ (g) → 4 NO (g) + 6 H₂O (g)
Answer:
44.2 g NO
Explanation:
Question is posted elsewhere, be sure to search before posting to save yourself some time :)
REEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
Answer:
c. sun, radiation
Explanation:
What is the volume, in liters, of 12 moles of a gas at a temperature of 467.5 K at a pressure of 9.67 atmospheres?
P
V
=
n
R
T
R = 0.0821
a
t
m
⋅
L
m
o
l
⋅
K
Explanation:
From PV = nRT
9.67V = 12(0.0821)(467.5)
V = 47.63 L
0.2 pts A molecule in which the central atom forms one double bond and two single bonds is said to have a ________ shape.
Answer:
Trigonal planar
Explanation:
Formaldehyde is a great example of this shape.
The central Carbon has a double bond with an Oxygen and two single bonds with Hydrogens
A compound with the empirical formula CH 2 O has a formula mass of 180 g/mol. What is its molecular formula
Empirical formula mass
12+2(1)+1628+230g/molMolecular fornula mass:-180g/mol
n=Molecular formula mass/Empirical formula massm=180/30n=6Molecular formula:-
n×Empirical formula6(CH_2OC_6H_12 O_6