A helium balloon at 23 C has a volume of 755 mL. The balloon is placed into a freezer kept at -10 C. Assuming pressure is constant, what is the new volume of the balloon?
Explanation:
T1/V1 = T2/V2
V2 = T2 x V1/T1
V2 = 296.15x535/319.15
V2 = 496.44mL
I NEED UR HELPPPP I HAVE TO SUBMIT IT IN 10 MINS!!!! PLEASE I HAVE NO IDEA
Explanation:
6/t1=4/293= 1750/4 =439.5-273=166.5
Hey u are loved!!!! Remember that don’t give up
Answer:
thank you :')
Explanation:
Answer:
Aw and thank you!
Explanation:
Even though you said I am loved, you are loved very much too! Don't you ever forget that! No matter what happens and how you feel remember that you are loved and mean so much to people. What you said to me means a lot to me! Thank you! YOU ARE LOVED!!
3. An unknown compound was found to have a molar mass of 75.0 g/mol and to
contain 32.0% carbon, 6.7% hydrogen and 18.7% nitrogen. The rest of the molecule
consists of oxygen. What is the molecular formula of the compound?
Gas giants all have rings around them.
true
or
false
I need answers now! please.
Answer:
Some particles of gas and dust that the planets are made of were too far away from the core of the planet and could not be squashed together by gravity. They remained behind to form the ring system
Explanation:
so in simplier terms yes lol
5. Calculate the number of moles of potassium nitrate, KNO3, in a sample with a mass of 85.2 grams.
0.843 mol KNO₃
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
85.2 g KNO₃
Step 2: Identify Conversions
Molar Mass of K - 39.10 g/mol
Molar Mass of N - 14.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of KNO₃ - 39.10 + 14.01 + 3(16.00) = 101.11 g/mol
Step 3: Convert
[tex]\displaystyle 85.2 \ g \ KNO_3(\frac{1 \ mol \ KNO_3}{101.11 \ g \ KNO_3} )[/tex] = 0.842647 mol KNO₃
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
0.842647 mol KNO₃ ≈ 0.843 mol KNO₃
Iodine monochloride (ICl) has a higher boiling point than bromine (Br2) partly because iodine monochloride is a(n)
Answer: polar molecule.
Explanation:
The boiling point is the temperature at which the vapor pressure of a liquid equals the external pressure surrounding the liquid. The boiling point is dependent on the type of forces present.
Iodine monochloride (ICl) is a polar molecule due to the difference in electronegativities of iodine and chlorine. Thus the molecules are bonded by strong dipole dipole forces. Thus a higher temperature is needed to generate enough vapor pressure.
Bromine [tex](Br_2)[/tex] is a non polar molecule as there is no electronegativity difference between two bromine atoms. The molecules are bonded by weak vanderwaal forces and thus has low boiling point.
Which of these is made of atoms from two or more different elements that are joined together chemically to make a molecule?
A. substances
B.elements
C.compounds
D. atoms
Answer: compounds
Explanation:
Compounds are made of atoms of two or more different types of elements, and they can be chemically combined to create a compound. The compound will have molecules from each of the elements you add in the compound. The answer to the question is compounds.
How does genetic variation play a role in evolution? I give Brainless
Answer:
Evolution is the process by which populations of organisms change over generations. Genetic variations underlie these changes
Explanation:
If a trait is advantageous and helps the individual survive and reproduce, the genetic variation is more likely to be passed to the next generation.
Brain-List?
Type the correct answer in the box.
Anna used 900 gallons of gasoline last year driving to and from work. This year, she changed jobs. She now uses only 600 gallons of gas annually.
If each gallon of gas releases 20 pounds of CO2 when burned, Anna reduced her CO2 emissions by ______%.
WILL MARK BRAINLIEST
Answer:The answer is 3.33%. Anna reduced her CO2 emissions by 3.33% from using 600 gallons of gas annually than from using 900 gallons of gasoline annually.
Explanation:
If an electron goes from n=5 to n=4, is energy released or absorbed?
Answer:
The energy can be released as one quantum of energy, as the electron returns to its ground state (say, from n = 5 to n = 1), or it can be released as two or smaller quanta as the electron falls to an intermediate state, then to the ground state (say, from n = 5 to n = 4, emitting one quantum, then to n = 1,
Of four atoms bellow,which two would be in the same group? Sorry that the quality is so bad :(
How many atoms are there in 7.80 moles of germanium
4.70 × 10²⁴ atoms Ge
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
BracketsParenthesisExponentsMultiplicationDivisionAdditionSubtractionLeft to RightChemistry
Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
7.80 mol Ge
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]\displaystyle 7.80 \ mol \ Ge(\frac{6.022 \cdot 10^{23} \ atoms \ Ge}{1 \ mol \ Ge} )[/tex] = 4.69716 × 10²⁴ atoms Ge
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
4.69716 × 10²⁴ atoms Ge ≈ 4.70 × 10²⁴ atoms Ge
3 A roller coaster car travels up a hill until it reaches the top, slowly goes over, and speeds down the hill and through the nust of the roller coaster. At the end, the brakus quickly stop the car and the riders appear to continue moving forward. Which of Newton's laws of motion best applies to the riders of the roller coaster?
Answer:
3rd law
Explanation:
Balance the following equations
Al + Cl2 AlCl3
Ag2O + Be Ag + BeO
K + O2 K2O
CoP + NaBr CoBr3 + Na3P
Si + Hg2S SiS2 + Hg
Li + Ni3N2 Li3N + Ni
Ca + K3N --> Ca3N2 + K
SnS2 + F2 --> SnF4 + S
Answer:
Explanation:
2Al + 3Cl2 --> 2AlCl3
Ag2O + Be -----> 2Ag + BeO
4K + O2 ---> 2K2O
CoP + 3NaBr ---> CoBr3 + Na3P
Si + Hg2S ---> SiS2 + Hg
6Li + Ni3N2 --- > 2Li3N + 3Ni
3Ca + 2K3N --> Ca3N2 + 6K
SnS2 + 2F2 --> SnF4 + 2S
what are synthetic materials, how are they made, and why are they important?
Answer:
Synthetic fibers are made from synthesized polymers of small molecules. The compounds that are used to make these fibers come from raw materials such as petroleum-based chemicals or petrochemicals. These materials are polymerized into a chemical that bonds two adjacent carbon atoms.
Answer these to get 75 points
Answer:
2. waves
3. True
4. the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
5. Frequency is the number of occurrences of a repeating event per unit of time.
6. slow, fast
7. left to right
8. The maximum displacement or distance moved by a point on a vibrating body
9. No
10. radio waves, and microwave.
11. tv uses electromagentic waves while light uses electromagenti radition.
Explanation:
Determine whether or not each molecule is a carbohydrate. If it is, classify it as a monosaccharide, a disaccharide, or a trisaccharide.
Answer:
See explanation
Explanation:
Among all the options listed, only compound (c) is a carbohydrate and it is a trisaccharide.
Carbohydrates are represented by the formula (CH2O)n, the subscript n denotes the number of carbon atoms in the carbohydrate. Carbohydrates contains carbon, hydrogen and oxygen in the ratio of 1:2:1.
Carbohydrates can have linear structures and cyclic structures. The cyclic structure as in (c) is mostly obtained in solution. All carbohydrates are six carbon sugars linked together at a certain point as in structure (c).
While washing his hands before the client consultation with Chloe, Jayden dripped some water onto the countertop. When he came back later to wipe it up, it had evaporated. What happened to the drops of water?
The water underwent a chemical change.
The water underwent a physical change.
The water became an organic substance.
The water became a pure substance.
Answer:
the water underwent a physical change. This is because the water simply changed states, and could become liquid again, but it will remain H20 throughout the time
Need Help Solving It.
What is the mass of copper chloride in 50 cm' of a 300 g/dm solution?
Answer:
There are 15 grams of copper chloride in 50 cubic centimeters of solution.
Explanation:
The statement is incorrect. The complete sentence will be presented below:
What is the mass of cooper chloride in 50 cubic centimeters of a 300 grams per cubic decimeters?
In Chemistry, a common unit for concentration is grams per cubic centimeter. A cubic decimeter equals 1000 cubic centimeters. First, we convert the given concentration into the requested unit:
[tex]c = 300\,\frac{g}{dm^{3}} \times \frac{1\,dm^{3}}{1000\,cm^{3}}[/tex]
[tex]c = 0.3\,\frac{g}{cm^{3}}[/tex]
Which means there are 0.3 grams of copper chloride per each cubic centimeter of solution.
The amount of mass of copper chloride contained in 50 cubic centimeters of solution is calculated by dimensional analysis:
[tex]m = \left(0.3\,\frac{g}{cm^{3}} \right)\cdot (50\,cm^{3})[/tex]
[tex]m = 15\,g[/tex]
There are 15 grams of copper chloride in 50 cubic centimeters of solution.
a. 20 moles of NH3 are needed to produce how many moles of H2O?
b. How many moles of N2 will be produced if 3.5 moles of O2 react?
a. 30 moles of H₂O
b. 2.33 moles of N₂
Further explanationGiven
a. 20 moles of NH₃
b. 3.5 moles of O₂
Required
a. moles of H₂O
b. moles of N₂
Solution
Reaction
4NH₃+3O₂⇒2N₂+6H₂O
a. From the equation, mol ratio NH₃ : H₂O = 4 : 6, so mol H₂O :
=6/4 x mol NH₃
= 6/4 x 20 moles
= 30 moles
b. From the equation, mol ratio N₂ : O₂ = 2 : 3, so mol N₂ :
=2/3 x mol O₂
= 2/3 x 3.5 moles
= 2.33 moles
The moles of H₂O produced by 20 moles of NH₃ are 30 moles, moles of N₂ produced by 3.5 moles of O₂ is 2.3 moles.
What is moles?
Moles is a unit of mass, which gives information about the relative amount of species present in any reaction.
Given chemical reaction will be represented as:
4NH₃ + 3O₂ → 2N₂ + 6H₂O
From the stoichiometry of the reaction it is clear that-
4 moles of NH₃ = produce 6 moles of H₂O
20 moles of NH₃ = produce 6/4×20=30 moles of H₂O
Again from the stoichiometry of the reaction it is clear that-
3 moles of O₂ = produce 2 moles of N₂
3.5 moles of O₂ = produce 2/3×3.5=2.3 moles of N₂
Hence required moles are 30 moles of H₂O and 2.3 moles of N₂.
To know more about moles, visit the below link:
https://brainly.com/question/15374113
whats the importance of stoichiometry?
please write it in ur own words
Answer:
It helps you predict how much of a reactant participates in a chemical reaction
Explanation:
Can anything change solutions? Be
specific!
Wass, volume and density are all properties of
matter
3
weight.
formula
Answer:
:)
Explanation:
They are all properties of Matter. weight and formula wouldn't make sense.
Si se encierran 100 gramos de benceno C6H6 en un recipiente con aire, se observa que, al cabo de cierto tiempo, se han evaporado 1,273 gramos, logr´andose as´ı la saturaci´on del aire con vapor de benceno. En cambio, si se disuelven 10 gramos de un soluto no vol´atil en 100 gramos de benceno y la mezcla se coloca en el recipiente anterior y a la misma temperatura, se observa que se han evaporado 1,205 gramos de benceno. A partir de estos datos, deducir la masa molecular de la sustancia disuelta.
Answer:
La masa molar de la sustancia disuelta es de aproximadamente 138,473 g/mol
Explanation:
Los parámetros dados son;
La masa de benceno en el recipiente = 100 gramos
La masa de benceno que se evapora del benceno puro = 1.273 gramos
La masa del soluto no volátil disuelto en 100 gramos de benceno = 10 gramos
La masa de benceno que se evapora de la mezcla = 1.205 gramos
Según la ley de Raoult, tenemos;
[tex]P_ {solucion} = P_ {solvente} \times X _ {solvente}[/tex]
Dónde;
[tex]P_ {solucion}[/tex] = La presión de vapor de la solución.
[tex]P_ {solvente}[/tex] = La presión de vapor del solvente
[tex]X_ {solvente}[/tex] = La fracción molar del solvente
Por lo tanto;
[tex]X_ {solvente} = \dfrac {P_ {solucion}} {P_ {solvente}}[/tex]
Según la ley de los gases ideales, tenemos;
[tex]P \times V = n \times R \times T = \dfrac{m}{M} \times R \times T[/tex]
Dónde;
P = La presión del gas
V = El volumen ocupado por el gas
m = La masa del gas
M = La masa molar del gas
R = La constante universal de los gases
T = La temperatura del gas
n = El número de moles del gas
Por lo tanto;
[tex]P = \dfrac{m \times R \times T}{M \times V}[/tex]
Donde R, T, M y V son constantes, tenemos P ∝ m
[tex]\therefore X_ {solvente} = \dfrac {P_ {solucion}} {P_ {solvente}} = \dfrac {Masa \ evaporada \ de \ solucion} {Masa \ evaporada \ de \ solvente} = \dfrac {1.205 \ g} {1.273 \ g} \approx 0.9466[/tex]
[tex]X_ {solvente}[/tex] ≈ 0.9466
[tex]X_ {solvente} = \dfrac {El \ numero \ de \ moles \ del \ solvente} {El \ total \ numero \ de \ moles \ de \ la \ solucion}[/tex]
El número de moles del solvente, C₆H₆ = (Masa de C₆H₆) / (La masa molar de C₆H₆) = 100 g / (78.11 g.mol) ≈ 1.28025 moles
El número de moles del solvente, C₆H₆ ≈ 1.28025 moles
El número total de moles = El número de moles del solvente, C₆H₆ + El número de moles del soluto no volátil, [tex]n_ {soluto}[/tex]
[tex]\therefore X_ {solvente} = 0.9466 = \dfrac {1.28025 \ moles} {1.28025 \ moles + n_ {soluto}}[/tex]
0.9466 × (1.28025 moles + [tex]n_ {soluto}[/tex]) = 1.28025 moles
1.21189 moles + 0.9466 × [tex]n_ {soluto}[/tex] = 1.28025 moles
[tex]n_ {soluto}[/tex] = (1.28025 - 1.21189)/0.9466 moles ≈ 0.07221635 moles
[tex]\therefore \dfrac {Masa \ de \ soluto} {Molar \ masa \ de \ soluto} = \dfrac {10 \ g} {Molar \ masa \ de \ soluto} \approx 0.07221635 \ moles[/tex]
[tex]\ Masa \ molar \ de \ soluto = \dfrac {10 \ g} {0.07221635 \ moles} \approx 138.473 \ g / moles[/tex]
La masa molar de la sustancia disuelta (el soluto) ≈ 138,473 g/mol
can someone tell me what sexual reproduction is but like in your own words
Answer:
its when 1 male, produces a sperm, which them goes to fuse with the sperm from the female.
17. Calculate the percent composition of B2Br6
Answer:
%composition of B₂ = 4.3%
%composition of Br₆ = 95.7%
Explanation:
Given data:
Percent composition of B₂Br₆ = ?
Solution:
Total mass of B₂Br₆ = 10.8×2 + 79.9×6 = 501 g/mol
%composition of B₂ = ( 21.6 g/ 501 g ) × 100
%composition of B₂ = 0.043 × 100
%composition of B₂ = 4.3%
%composition of Br₆ = ( 479.4 g/ 501 g ) × 100
%composition of Br₆ = 0.957 × 100
%composition of Br₆ = 95.7%
What are the two types of economic activity? Explain
Answer:
Economic activity: Activities that are related to the production and consumption of goods in return for money. The main motive is to earn money.
The economic activities are:
Primary activity: these are related to the extraction of natural resources.
Secondary activity: these are related to the processing of raw materials.
Tertiary activity: these are related to providing services.
Create a chemical equation for "Bubbling chlorine gas through a solution of sodium bromide gives elemental bromine and a solution of sodium chloride" and balance it.
Answer:
[tex]Cl_{2} +2NaBr ---> 2NaCl + Br_{2}[/tex]
Explanation:
