Answer:
.385 atm .
Explanation:
pressure of a gas is proportional to absolute temperature .
P ∝ T
P₁ / P₂ = T₁ / T₂
Given P₁ = .47 atm , T₁ = 60 + 273 = 333
P₂ = ? , T₂ = 273 K
.47 / P₂ = 333 / 273
P₂ = .385 atm .
16.A mixture of carbon dioxide and hydrogen gases contains carbon dioxide at a partial pressure of 217 mm Hg and hydrogen at a partial pressure of 703 mm Hg. What is the mole fraction of each gas in the mixture?
XCO2 =
XH2 =
x CO₂ = 0.236
x H₂ = 0.764
Further explanationGiven
P CO₂ = 217 mmHg
P H₂ = 703 mmHg
Required
The mole fraction
Solution
Dalton's law :
The total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
Can be formulated:
P tot = P1 + P2 + P3 ....
P tot for the mixture :
= 217 mmHg + 703 mmHg
= 920 mmHg
Mole fraction of each gas :
x CO₂ = 217 mmHg/920 mmHg = 0.236
x H₂ = 703 mmHg/920 mmHg = 0.764
The specific branch of chemistry that focuses on molecules such as salts and water that constitute non-living matter, but are still important to living things, is termed
Answer: Inorganic chemistry
Explanation:
Inorganic chemistry can be defined as the branch of chemistry which studies the behavior of the inorganic compounds. Inorganic compounds are those compounds which lack carbon hydrogen bonding. The carbon monoxide, carbon dioxide, sodium chloride and water are the examples of inorganic compounds. This branch also studies the effect of these chemical compounds on the living things. The water and salts are chemicals which regulate the chemical and physiological reactions in the body.
What is the proper value for C in the above table.
A. 28
B. 30
C. 32
D. 65
Answer:
28
Explanation:
electron = atomic number - charge(if the charge is positive and addition if the charge is negative)
electron = 30 - 2
electron = 28
Please help me.
Thank you!
Answer: Positive
Explanation: Just a guess
Answer:
Positive
Explanation:
Workout the formula for:
Magnesium Bromide
Potassium Chloride
KOH + _co2 -_ксоз + _Н,0
Answer:
2KOH + 3co2 ------->2ксоз + 2Н20
A rigid vessel contains 2.5 mol of H2(g). How many grams of hydrogen are in the vessel.
Answer:
5 g of H₂ are contained in the vessel
Explanation:
A typical excersise of conversion:
We determine molar mass of H₂.
This is a dyatomic molecule, as molar mass of H is 1g/mol, molar mass of H₂ will be 2g/mol.
Let's make the conversion of units:
2.5 mol . 2g/mol = 5 g
5 g of H₂ are contained in the vessel
Mass of hydrogen in the vessel = 5 grams
Number of moles:The number of moles is defined as the given mass over molar mass.
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Given:
Number of moles= 2.5 mol
To find:
Mass of hydrogen=?
Molar mass of hydrogen =2g/mol
On substituting the values in the given formula we will get:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\\\\\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}=2.5 mol* 2g/mol\\\\\text{Given mass}=5 g[/tex]
Thus, mass of hydrogen in the vessel is 5 grams.
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which atomic particles have no charge?
Answer:
the answer is neutron :)))))))))
which is an example of radiation?
Hot air rises and cool air moves in to take its place.
Heated water begins circulating in a fish tank.
Your car parked in the sun is hot when you return.
You burn your feet on a hot sidewalk on a sunny day.
Answer:
Heated water begins circulating in a fish tank.
Explanation:
Answer:
Heated water begins circulating in a fish tank.
Marianne designs an experiment involving electrically charged objects. She wants to know which objects will be attracted to a negatively charged balloon. Identify the test variable, the outcome variable, and the control variable for this experiment.
WILL GIVE BRAINIST
Answer:
When one object is rubbed against another, static electricity can be created. This is because the rubbing creates a negative charge that is carried by electrons. The electrons can build up to produce static electricity. For example, when you shuffle your feet across a carpet, you are creating many surface contacts between your feet and the carpet, allowing electrons to transfer to you, thereby building up a static charge on your skin. When you touch another person or an object, you can suddenly discharge the static as an electrical shock.
Similarly, when you rub a balloon on your head it causes opposite static charges to build up both on your hair and the balloon. Consequently, when you pull the balloon slowly away from your head, you can see these two opposite static charges attracting one another and making your hair stand up.
Materials
• Balloon
• An object made out of wool (such as a sweater, scarf, blanket or ball of yarn)
• Stopwatch
• A wall
• A partner (optional)
Preparation
• Blow up the balloon and tie off the end.
• Have your partner prepare to use the stopwatch.
Procedure
• Hold the balloon in a way that your hand covers as little of its surface area as possible, such as by using only your thumb and pointer finger or by gripping the balloon by its neck where it is tied off.
• Rub the balloon on the woolly object once, in one direction.
• Hold the balloon up on the wall with the side that was rubbed against the wool facing the wall, then release it. Does the balloon stay stuck on the wall? If the balloon stays stuck, have your partner immediately start the stopwatch to time how long the balloon remains bound to the wall. If the balloon does not stick, move to the next step.
• Touch the balloon to a metal object. Why do you think this is important to do?
• Repeat the above process but each time increase the number of times you rub the balloon on the woolly object. Rub the balloon in the same direction each time. (Do not rub the balloon back and forth.)
Observations and results
In general, did the balloon stick to the wall for a longer amount of time as you increased the number of times you rubbed the balloon on the woolly object?
Wool is a conductive material, which means it readily gives away its electrons. Consequently, when you rub a balloon on wool, this causes the electrons to move from the wool to the balloon's surface. The rubbed part of the balloon now has a negative charge. Objects made of rubber, such as the balloon, are electrical insulators, meaning that they resist electric charges flowing through them. This is why only part of the balloon may have a negative charge (where the wool rubbed it) and the rest may remain neutral.
When the balloon has been rubbed enough times to gain a sufficient negative charge, it will be attracted to the wall. Although the wall should normally have a neutral charge, the charges within it can rearrange so that a positively charged area attracts the negatively charged balloon. Because the wall is also an electrical insulator, the charge is not immediately discharged. However, because metal is an electrical conductor, when you rub the balloon against metal the extra electrons in the balloon quickly leave the balloon and move into the metal so the balloon is no longer attracted and does not adhere.
HOPE IT HELPS
PLEASE MARK ME BRAINLIEST
The test variables and the control variable and the outcome variables are Balloons, the electrical insulators, and resist electric charges flowing through them.
What are variables?When we brush a balloon against our head, the hair and balloon both develop opposing static charges. We can see how these two opposing static charges attract one another and make our hair stand up as the balloon is gently dragged away from our head.
When a balloon is rubbed to the wall, it will be attracted to the wall. Because the wall is an electrical insulator, the charge is not quickly discharged.
The excess electrons in the balloon immediately leave the balloon and go into the metal when it is rubbed against metal. As a result, the balloon is no longer attracted to the metal and does not adhere.
Therefore, Balloons, which act as electrical insulators and prevent the flow of electric charges, serve as the test, control, and outcome variables.
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16.
A mixture of methane and oxygen gases, at a total pressure of 701 mm Hg, contains 2.75 grams of methane and 3.45 grams of oxygen. What is the partial pressure of each gas in the mixture?
PCH4 = __
mm Hg
PO2 = ___
mm Hg
Answer:
P(O₂) = 287.41 mmHg
P(O₂) = 413.59 mmHg
Explanation:
Given data:
Total pressure = 701 mmHg
Mass of methane = 2.75 g
Mass of oxygen = 3.45 g
Partial pressure of each gas = ?
Solution:
Number of moles of methane:
Number of moles = mass/molar mass
Number of moles = 2.75 g/ 16 g/mol
Number of moles = 0.17 mol
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 3.45 g/ 32 g/mol
Number of moles = 0.12 mol
Total number of moles = 0.12 mol + 0.17 mol = 0.29 mol
Partial pressure of oxygen:
P(O₂) = [ moles of oxygen / total moles ] × total pressure
P(O₂) = [0.12 / 0.29 ] × 701 mmHg
P(O₂) = 0.41 × 701 mmHg
P(O₂) = 287.41 mmHg
Partial pressure of methane:
P(O₂) = [ moles of oxygen / total moles ] × total pressure
P(O₂) = [0.17 / 0.29 ] × 701 mmHg
P(O₂) = 0.59 × 701 mmHg
P(O₂) = 413.59 mmHg
24. How many electrons can each p orbital hold?
Answer: Each p orbital can hold 6 electrons.
Explanation: The p sublevel has 3 orbitals, so it can contain a maximum of 6 electrons.
what is the percent composition of (NH4)2S?
if you can, include the problem shown pls
extra.
Mg(NO3)2
please don't just take the points please :(, do the problem
thank you <333
(NH₄)₂S
%N= 41.18%
%H =11.76%
%S=47.06%
Mg(NO₃)₂
%Mg=32.43%
%N=18.92%
%O=(64.86%
Further explanationGiven
(NH₄)₂S
Mg(NO₃)₂
Required
The percent composition
Solution
(NH₄)₂S MW=68 g/mol
%N=2. Ar N / MW (NH₄)₂S x 100%
%N= (2.14/68) x 100% = 41.18%
%H =(8.1/68) x 100%=11.76%
%S=(32/68)x 100%=47.06%
Mg(NO₃)₂ MW=148 g/mol
%Mg=(2.24/148)x100%=32.43%
%N=(2.14/148)x100%=18.92%
%O=(6.16/148)x100%=64.86%
Which activity is an example of a scientist using creativity?
a scientist exploring evidence from other fields of science to support findings
a scientist transferring data from one experiment into the data analysis from a second experiment
a scientist repeating an older experiment with the latest technology to verify the original findings
a scientist using the latest graphing software to analyze and present the research
A scientist exploring evidence from other fields of science to support findings is an example of a scientist using creativity.
What is creativity?Creativity is a mental cognitive ability that involves the creation and/or discovery of a hidden process.
In science, creativity refers to the application of mental skills to create new experimental designs and extrapolate findings.
In conclusion, a scientist exploring evidence from other fields of science to support findings is an example of a scientist using creativity.
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EASY BUT I STILL NEED HELP
Compared to ice, how do molecules of water behave?
Group of answer choices
1.They Move less freely
2.They are locked into a crystal shape or lattice
3.They move more freely
4.They bounce off one another freely
Answer: 3 they move more freely since water is a liquid and ice is a solid in a solid molecules are more compact and cannot move around much but in a liquid it moves more freely than it would in a solid.
Explanation:
Compared to ice, molecules of water behave differently in that they move more freely. The Option C.
How do the behaviors of water molecules compare to those of ice?In the solid state, water molecules arrange themselves into a crystal structure, forming a lattice in ice. This lattice structure restricts the movement of the water molecules causing them to vibrate in fixed positions.
On the other hand, in the liquid state, the water molecules have more kinetic energy allowing them to move more freely and interact with each other by forming temporary hydrogen bonds. This increased mobility of water molecules in the liquid state enables them to flow and take the shape of their container.
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Diseases are classified into _______ and _____ based on their duration.
Answer:
communicable and non-communicable?
Compare and contrast protons and neutrons. Use A.C.E.
A= Answer
C= Cite Evidence
E= Expand
1.When acids react with carbonates,------------gas is liberated.
Answer:When acids react with carbonates,---CO2--------gas is liberated.
Explanation:
Acids liberate Carbon IV oxide when they react with Carbonates bicarbonate
For examples
Acid +carbonate ⟶ Salt + Water + Carbon dioxide
Calcium carbonate + Hydrochloric acid will give Calcium chloride with the liberation of CO2 gas and water
CaCO3 + 2HCl →CaCl2 + CO2 + H2O
To Test for the presence of the CO2 Liberated, we pass the gas through lime water, if the lime water turns milky, then C02 gas is confirmed.
100 POINTS!!! ANSWER ASAP
Answer:
1eV
Explanation:
Answer:
1ev
Explanation:
A silver cube with an edge length of 2.28 cm and a gold cube with an edge length of 2.75 cm are both heated to 82.8 ∘C and placed in 111.5 mL of water at 20.2 ∘C . What is the final temperature of the water when thermal equilibrium is reached?
Solution :
Given :
length of silver cube = 2.28 cm
length of gold cube = 2.75 cm
Initial temperature = 82.8°C
Volume of silver cube is
Volume [tex]$=(\text{edge length})^3$[/tex]
= [tex]$(2.28)^3$[/tex]
[tex]$= 11.8 \ cm^3$[/tex]
mass of silver cube
Mass, [tex]$m_s = \text{density} \times \text{volume} $[/tex]
= 10.5 x 11.8
= 123.9 g
Similarly, the volume of gold cube is
Volume [tex]$=(\text{edge length})^3$[/tex]
= [tex]$(2.75)^3$[/tex]
[tex]$= 20.79 \ cm^3$[/tex]
mass of gold cube
Mass, [tex]$m_g = \text{density} \times \text{volume}$[/tex]
= 19.3 x 20.79
= 401.247 g
Now
heat lost by silver and gold cube = heat gained by water
∴[tex]$m_g .c_g \Delta T + m_s .c_s \Delta T = m_w.c_w \Delta T$[/tex]
[tex]$m_g .c_g (82.8- T) + m_s .c_s (82.8- T) = m_w.c_w (T - 20.2)$[/tex]
[tex]$401.247 \times 0.1264 (82.8- T) + 123.9 \times 0.2386 (82.8- T) = 111.5 \times 4.184 (T - 20.2)$[/tex]
Now solving the equation
[tex]$50.71 (82.8- T) + 29.56 (82.8- T) = 466.51 (T - 20.2)$[/tex]
Final temperature, T = 31.27°C
What group number is Plutonium in and how do you know?
Answer:Actinide Group
Explanation:Plutonium is a member of the actinide group in the periodic table. Plutonium atoms have 94 electrons and 94 protons with 2 valence electrons in the outer shell. There are 150 neutrons in the most abundant isotope.
What house item is similar to a pancreas and gall bladder
Answer: The pancreas is a gland organ located in the abdomen. ... The end of this duct is connected to a similar duct that comes from the liver, which delivers bile to the duodenum. ... A person can usually treat minor chest injuries at home with rest and ...
how are volcanologist and meteorologist similar and different?
Answer:
They are different because one is someone who studies volcanoes and the other is someone who studies weather
Explanation:
What is the molarity of a solution with 1.43 moles of sodium chloride in 0.875 liters of solution?
1.63 M
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightEquality Properties
Multiplication Property of Equality Division Property of Equality Addition Property of Equality Subtract Property of EqualityChemistry
Unit 0
Reading a Periodic TableWriting CompoundsAqueous Solutions
Molarity = moles of solute / liters of solutionExplanation:Step 1: Define
1.43 mol NaCl (sodium chloride)
0.875 L solution
Step 2: Find M
Substitute [M]: x M = 1.43 mol NaCl / 0.875 LDivide: x = 1.63429 MStep 3: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.63429 M ≈ 1.63 M
16. Put the following pairs in order from least polar to most polar:
a. C-H N-H H-O H-F
b. C-H
C-S
H-F
C-N
C-O
H-Br
i.
Which pair in part b has the most electronegative bond? Least electronegative bond?
17. Explain how you could use the electronegativity scale to determine the direction and degree of
polarity between two atoms. (Direction meaning which way does the dipole arrow point)
Answer:
I think A does because there are so many letters in their so a
Select the correct answer. Which element is the most reactive nonmetal? A. sulfur (S) B. phosphorus (P) C. nitrogen (N) D. fluorine (F) E. bromine (Br) Reset
Answer:
FLUORINE
The most reactive nonmetal is fluorine. Fluorine is a halogen, which is Group 17 on the periodic table, and the halogens are the most reactive nonmetals. This is because they all have one empty space in their valence electron shells.
Explanation:
3
Using the balanced equation
2 KCIO3 2 KCl + 302
If 9.6 moles of O2 are produced, how many moles of KCIO3 are decomposed?
6
Answer:
6.4 moles of KClO₃ are decomposed
Explanation:
Given data:
Number of moles of O₂ produced = 9.6 mol
Number of moles of KClO₃ decomposed = ?
Solution:
Chemical equation:
2KClO₃ → 2KCl + 3O₂
now we will compare the moles of oxygen and KClO₃.
O₂ : KClO₃
3 : 2
9.6 : 2/3×9.6 = 6.4 mol
Thus, 6.4 moles of KClO₃ are decomposed.
6.
Tristan completed a lab that combusted 5.0 grams of sodium
Write a complete balanced equation for the combustion of sodium.
a
b. What is the maximum amount of product that Tristan can obtain in this lab?
Answer:
4Na + O₂ → 2Na₂O
6.82g
Explanation:
The combustion of sodium involves combining the element with oxygen gas:
4Na + O₂ → 2Na₂O
We have been given 5g of Na.
The balanced reaction equation is given as shown above. This reaction is also a synthesis or combination reaction.
b. Maximum amount of product that can be obtained.
Sodium is the limiting reactant and it will determine the amount of product that can be formed.
To solve this, we find the number of moles of the given sodium.
Mass of given sodium = 5g
Molar mass of Na = 23g/mol
Number of moles of Na = [tex]\frac{mass}{molar mass}[/tex]
Insert the parameters and solve;
Number of moles of Na = [tex]\frac{5}{23}[/tex] = 0.217moles
From the balanced reaction equation:
4 moles of Na will produce 2 moles of Na₂O
0.217 moles of Na will produce [tex]\frac{0.217 x 2}{4}[/tex] = 0.11mole of Na₂O
So;
Mass of Na₂O = number of moles x molar mass
Molar mass of Na₂O = 2(23) + 16 = 62g/mol
Mass of Na₂O = 0.11 x 62 = 6.82g
: How are reefs impacted by disease?
Answer:
The frequency of coral diseases has increased significantly over the last 10 years, causing widespread mortality among reef-building corals. Many scientists believe the increase is related to deteriorating water quality associated with human-made pollutants and increased sea surface temperatures.
Explanation:
WhT is the amount of NaCI that can be added to 50.0g of water at 60.0oc?
Answer:
the image won't load so maybe upload it again please