NH₄⁺(aq)+NO₃⁻(aq) → NH₄NO₃(s)
How much energy is released when 3 moles of NH₄+ react?
1) -25.69 kJ
2) -51.38 kJ
3) -77.07 kJ
4) -102.76 kJ
Your friend sits on a 25.0L exercise ball, squishing the ball so that it is only 17.5L. What is the pressure inside the ball if the outside air pressure is 100. kPa?
Use the Boyle's Law equation to determine the answer.
Answer:
b
Explanation: because i took the test and got a 100
An element A has an atomic number of 11 and another element B has an atomic number 17 (A
and B are not actual chemical symbols of elements)
i. What group on the periodic table does A belong?
ii. What type of bond will be formed between A and B? Explain.
(2mks
(1ml
iii.
Write the formula of the compound that will be formed between A and B.
(lm
b. Arrange the species X, X5+ and X. in order of increasing size.
Answer:
can anyone tell me how to get +7!67:$'!$
Para solucionar el ejercicio primero se debe conocer el número atómico de los elementos para determinar cuantos electrones tiene cada uno N: número atómico 7, tiene 7 electrones Nivel 1: 2 electrones Nivel 2: 5 electrones P: número atómico 15, tiene 15 electrones Nivel 1: 2 electrones Nivel 2: 8 electrones Nivel 3: 5 electrones Cl: número atómico 17, tiene 17 electrones
Answer:
El número atómico se refiere al número de protones o electrones de un átomo.
Explicación:
El número atómico se refiere a la cantidad de protones o la cantidad de electrones que giran alrededor de las capas u órbita de un átomo, por lo que el número atómico 7 representa que el átomo tiene 7 electrones o protones mientras que, por otro lado, el número atómico 17 muestra el número de electrones o protón. Solo hay dos electrones que entran en la primera órbita y en el resto de las capas tiene espacio para 8 electrones por lo que los átomos pierden o agregan electrones en su capa más externa para obtener estabilidad.
What processes contribute water to surface water sources?(science)
What are the chemical reactions involved in CO2 emission?
If 190dm of hydrogen gas collected at 20°c and 760mmHg .Calculate it's volume at stp (standard pressure=760mmHg
Answer:
177.1 L
Explanation:
The excersise can be solved, by the Ideal Gases Law.
P . V = n . R . T
In first step we need to determine the moles of gas:
We convert T° from, C° to K → 20°C + 273 = 293K
We convert P from mmHg to atm → 760 mmHg = 1atm
1Dm³ = 1L → 190L
We replace: 190 L . 1 atm = n . 0.082 . 293K
(190L.atm) / 0.082 . 293K = 7.91 moles.
We replace equation at STP conditions (1 atm and 273K)
V = (n . R .T) / P
V = (7.91 mol . 0.082 . 273K) / 1atm = 177.1 L
We can also make a rule of three:
At STP conditions 1 mol of gas occupies 22.4L
Then, 7.91 moles will be contained at (7.91 . 22.4) /1 = 177.1L
A solute can be obtained from a solution by...
Answer:
Evaporating the solvent
Explanation:
Which is NOT an application of chemistry to life? *
a. Fertilizers used by farmers
b. Soaps used to clean
c. Medicine used by doctors
d. Hammer used by construction worker
The thermal energy of matter increases when ___.
A. Heat flows of the matter
B. The mass of the matter decreases
C. Heat flows into the matter
D. The temperature decreases
Please help!!
The diagram shows the electron configuration of an atom of an element for the electrons in the s and p orbitals.
What is the group number of the element in the periodic table?
A) 1
B) 2
C) 13
D) 15
Answer:
15
Explanation:
because since the outer shell has 5 electron then add 5 and 10 to get 15
21.82 L of 4.65 M HCl is added to 9.31 L of 8.55 M NaOH. What is the concentration of HCl in the resulting solution? **hint: make ICE table
A)1.90 M
B)0.952 M
C)10.3 M
D)0.702 M
E)0.644 M
Answer:
D
Explanation:
First you multiply 4.65 with 21.82 to get the mols of hcl, which is 101.463. Then you make an ice table. The ice table should look like this:
HCl + NaOH = 12NaCl + H2O
101.463 6.022e23 1.989e30
As the ice table above shows, you will have 1.989e30 mols of nacl after the reaction. With that information, you can then divide it by 2.833333333333333e30 to get 0.702 M.
Step 6: Measure Solubility in Boiling Water
110
100
80
100 ml
60
90
40
20
Temperature of the water to the nearest degree:
°C. DONE
Intro
Answer:
the answer is 102- i took did it on edg
Explanation:
The ability of a material, the solute, to combine with some other substance, the solvent, is known as solubility. Temperature of the water to the nearest degree is 110 °C for the given solubility.
The ability of a material, the solute, to combine with some other substance, the solvent, is known as solubility in chemistry. Insolubility, or the solute's inability to create such a solution, is the opposite property.
The concentration of a solute inside a saturated solution—a solution where no more solute could be dissolved—is typically used to gauge the degree of a substance's solubility in a particular solvent. Temperature of the water to the nearest degree is 110 °C for the given solubility.
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Which set of elements represents a period within the Periodic Table?
H, He, Ar , Xe , Rn ,
N, P, As, Sb , Bi
K, V, Fe, Ga , Kr
La, Pa, Sm, Tb, Yb
What is represented by this notation?
Na loses one proton to Cl.
Na loses one electron to Cl.
Na gains two protons from Cl.
Na gains one electron from Cl.
Answer:
it's the third
Explanation:
I need to fill 20 spaces. don't mind that
Answer:
Na gains two protons from Cl.
Explanation:
this should help
Please help me classify properly.
Answer:C
Explanation:
Homogeneous Mixture
Answer:
homogeneous mixture
Explanation:
it is the same throughout so therefore it can be separated
transmutation occurs during which type of radioactive decay
Explanation:
Transmutation, conversion of one chemical element into another. A transmutation entails a change in the structure of atomic nuclei and hence may be induced by a nuclear reaction (q.v.), such as neutron capture, or occur spontaneously by radioactive decay, such as alpha decay and beta decay (qq. v.).
science:my chosen place is bonifacio global city
i choose this place because?
Answer:
Rewrite the following sentence in reported speech
The chair person said,"A hearty welcome to all present!"
A student drops a white tablet into a glass of water, producing
carbon dioxide gas. This is a demonstration of
A. a change of state.
B. a chemical reaction.
C. the creation of matter.
O D. the movement of electricity.
Answer:
A chemical reaction
Explanation:
A solution's hydrogen ion concentration is 1 x 10-SM.
What is the pH?
Answer:
the Ph is
Explanation:
90rn hub
10 moles of potassium hydroxide in 5.16 L of solution
Answer:
The molarity is 8.52M
Explanation:
molality = moles of solute/kg of solvent = 5.2mol/kg
moles of solute = 5.2mole
mass of solute = moles of solute × MW = 5.2 × 56.106 = 291.8g
mass of solvent = 1kg = 1000g
Mass of solution = mass of solute + mass of solvent = 291.8g + 1000g = 1291.8g
Density of KOH = 2120g/L
Volume of solution = mass/density = 1291.8/2120 = 0.61L
Molarity = number of moles of solute/volume of solution = 5.2/0.61 = 8.52M
The concentration in the solution is 1.94 mol/L
From the question,
We are to determine the concentration of 10 moles of potassium hydroxide in 5.16 L of solution.
From the formula
Number of moles = Concentration × Volume
Then, we can write that
[tex]Concentration = \frac{Number\ of\ moles}{Volume}[/tex]
From the question,
Number of moles of potassium hydroxide (KOH) = 10 moles
Volume of solution = 5.16 L
∴ Concentration of the solution = [tex]\frac{10}{5.16}[/tex]
Concentration of the solution = 1.94 mol/L
Hence, the concentration in the solution is 1.94 mol/L
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Here is the complete question:
Calculate the concentration in each of the following solutions:
1. 10 moles of potassium hydroxide in 5.16 L of solution
Help plzzZZZZ I really need help with this
What is a dominant trait and a recessive trait
Answer:
Dominant traits are always expressed when the connected allele is dominant, even if only one copy exists. Recessive traits are expressed only if both the connected alleles are recessive.
Explanation:
Freckles, cleft chin and dimples are all examples of a dominant trait.
5 Protons {+}
5 Electrons {-}
6 Neutrons {0}
What element is this ?
Answer:boron
Explanation:
A student performs an experiment with three unknown fluids and obtains the following measurements: Fluid A: m = 2060 g, V = 2000 mL Fluid B: m = 672 g, V = 850 mL
Fluid C: m = 990 g,
V = 1100 mL
Answer:
fluid - A is 1.03
fluid -B is 0.790
fluid - C is 0.90
Explanation:
In our exprimetal fluid, the density of
fluid - A is 1.03
fluid -B is 0.790
fluid - C is 0.90
The fluid with high density settles at bottom of the beaker and least dense fluid forms layer on the surface .
Fluid A is 1.03
Fluid B is 0.790
Fluid C is 0.90
What is measurment?Measurment is a process by which we can measure any physical quantity with the help of different apparatus. For example if one can want to measure the distance than he can use the a simple measuring scale.
Distance can be measured in kilometer,meter, centimeter etc. Temperature can be measured with the help of glass tube thermometer as glass tube is a simple temperature measuring appratus and glass tube thermometer is used to measure temperature in fahrenheit (F).
Measurment is a general process which can be used by a common person in his daily life. Every common thing which we use in our routine life need to be measured like if we buy sugar it will be measured in kilogram or gram. If a person buy milk it can measured in liter.
Therefore,Fluid A is 1.03
Fluid B is 0.790
Fluid C is 0.90
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i need help i have a homework assignment to finish and this is the last question help please and thank u
For a solution, [H+] = 1 x 10-2M.
What is the pH?
Answer:
pH=2
Explanation:
-log(1 x 10-2)=2
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Answer:
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Explanation:
Which type of stoichiometry problems does not require the use of molar mass?
Answer:
Explanation:
It is volume-volume problems that does not require the use of molar mass.
is copper an elementary substance or a compound?