STP = standard temperature and pressure
Use the formula:
d = MP/RT
where:
d = density = 1.25 g/L
M = molar mass (unknown)
P = pressure = 1 atm (standard pressure)
R = universal gas constant = 0.8206 L*atm/mol*K
T = temperature = 0C or 293.15 K (standard temperature)
1.25 g/L = M*(1 atm)/(0.08206 L*atm/mol*K)*(273.15 K)
M = 28.0 grams/mol
Please Help! Thank You
28.5 L = 1.00647 ft³
Further explanationGiven
28.5 Liters
Required
Convert to cubic feet
Solution
Dimensional analysis (unit analysis) is used to convert one unit to another using a conversion factor
Liters and A cubic foot (ft³) is a unit of volume
cubic feet (ft³) are commonly used in the US
Conversion factor :
1 Liter = 0,0353147 ft³
So for 28.5 Liters :
[tex]\tt 28.5~L\times \dfrac{0.0353147~ft^3}{1~L}=1.00647~ft^3[/tex]
The diagram above describes the movement of molecules in a substance used to make fuel. What change did the fuel scientist observe in the substance? (The diagram only shows some gray colored pots and underneath one it says "before: molecules move around each other" and the other one says "after molecules move away from each other") I needd helpppp asappp
A. Before the process, the substance was a solid. After the process, it was a liquid.
B. Before the process, the substance was a gas. After the process, it was a liquid.
C. Before the process, the substance was a liquid. After the process, it was a solid.
D. Before the process, the substance was a liquid. After the process, it was a gas.
Answer:
D "Before the process, the substance was a liquid. After the process, it was a gas.
Explanation:
hope this helps.
According to the forces of attraction , before the process substance was liquid and after the process it was a gas as gas molecules are farther away than those in liquid.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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covalent bonds always share electrons equally
A: True
B: False
I hope this helped! +*♡
Which pair of elements are in the same period on the periodic table?
А
Lithium & Sodium
B
Hydrogen & Potassium
C
Boron & Silicon
D
Sulfur & Argon
What is the answer to Isotope 3?
For the cold pack shown below, the temperature on the outside surface has dropped considerably from its initial temperature of 25 °C. Which of the following provides the best explanation for this temperature decrease?
Answer:
The correct answer is D
Explanation:
In an endothermic process, energy travels from the surroundings into the system. The decrease in the temperature on the outside of the bag indicates that energy has moved from the surroundings into the system.
The other answers are incorrect. A bag cannot release “cold” into the surroundings since cold refers to the absence of heat. The surroundings become colder when heat is removed. Option B is incorrect because the cooling is due to the cold pack absorbing heat energy from its surroundings. Option C is incorrect because a cold pack absorbs heat energy from the surroundings, not vice versa.
The surroundings are losing energy and the thermometer is measuring the temperature of the surroundings as the cold pack shows an endothermic process. Therefore, Option (D) is correct.
What is an endothermic reaction?Endothermic reactions are those in which the reactants absorb heat energy from their surroundings to form products. Endothermic reactions reduce the temperature of their surroundings and create a cooling effect. Physical processes can be endothermic in nature as well, for example, ice cubes absorb heat from their surroundings to form liquid water.
Endothermic reactions include the making of chemical bonds through the absorption of energy from the surroundings. On the other hand, exothermic reactions are in which the liberation of heat energy is generated from bond breakage.
The temperature of the cold pack is lower than the temperature of the surroundings. So the heat energy will be traveled from the surroundings to the cold pack.
Therefore, the temperature of the surroundings will fall as heat transfers to the cold pack.
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A sample of gold has a volume of 2 cm3 and a mass of 38.6 grams. What is the density of this sample? HINT: Use the formula D=m/v
In a given column of the periodic table the elements have _____.
a. similar properties
b. sequential atomic numbers
c. similar atomic masses
d. the same densities
Answer:
a. similar properties
Explanation:
In a given column of the periodic table, the elements have similar properties.
A column on the periodic table is known as a group or family. The group is a vertical arrangement of elements on the periodic table.
Elements in the same group have the same number of valence electrons after their group number.
For example, all the elements in group 1 have one valence electron. Those in group 2 have 2 valence electrons.
The valence electrons of an atom determines its chemical properties. So, all elements in the same group have the same chemical properties.
Answer: similar properties
Explanation:
A delivery truck hits a parked car from behind. The mass of the car is 2550 kg. What force is exerted on the car if (a) the car is rigid and accelerates to 4.5 m/s in 0.20 s? (b) the car has crumple zones and accelerates to 4.5 m/s in 0.30 s?
Helpp meee........TT
Explanation:
Given parameters:
Mass of the car = 2550kg
Initial velocity = 0m/s
Solution:
First problem is to find the force exerted on the car;
Velocity = 4.5m/s
Time = 0.2s
Acceleration = [tex]\frac{final velocity - initial velocity }{time}[/tex] = [tex]\frac{4.5 - 0}{0.2}[/tex] = 22.5m/s²
Force = mass x acceleration = 2550 x 22.5 = 57375N
B. Force on the car with crumple zones
Acceleration = [tex]\frac{final velocity - initial velocity }{time}[/tex] = [tex]\frac{4.5 - 0}{0.3}[/tex] = 15m/s²
Force = 2550 x 15 = 38250N
a. The force when the car is rigid and accelerated is 57375N.
b. The force where the car should have crumple zones should be 38250N
Calculation of the force:
Since Mass of the car = 2550kg
Initial velocity = 0m/s
Here,
Velocity = 4.5m/s
Time = 0.2s
a.
Here force = mass * acceleration
= 2550 * (4.5 - 0/0.2)
= 2550 * 22.5
= 57375 N
b.
Here force is
= mass * acceleration
= 2550 * (4.5 - 0/0.3)
= 2550 * 15
= 38250 N
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Can you seperate Oxygen molecules from Hydrogen in water?
a student finishes an experiment and is left with three empty beakers that held liquids during the experiment .the best lab practice is to
Answer:
Rinse With distilled water
How many grams are equal to 413 kg in scientific notation
Answer:
[tex]4.13[/tex] x [tex]10^{2}[/tex] = 413 kg
Explanation:
4.13 x 10 = 41.3 then we multiply 41.3 by 10 agian = 41.3 x 10 = 413
so, we multiplied ten two times that = [tex]10^{2}[/tex]
= 4.13 x [tex]10^{2}[/tex]= 413 kg
Given that 1 kilogram = 1000grams, the value of 413 kilograms in grams, using scientific notation is 4.13 × 10⁵g.
How many grams are equal to 413 kg in scientific notation?Note that;
1 kilogram = 1000grams
Given that;
Mass in kilograms = 413kgMass in grams = ?Since, 1 kilogram = 1000grams
413 kilograms = ( 413 × 1000 )grams
413 kilograms = ( 413000 )grams
413 kilograms = 4.13 × 10⁵ g
Given that 1 kilogram = 1000grams, the value of 413 kilograms in grams, using scientific notation is 4.13 × 10⁵g.
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Explain why noble gases cannot participate in ionic bond formation.
Explanation:
Noble gases are odorless, colorless, nonflammable, and monotonic gases that have low chemical reactivity. The full valence electron shells of these atoms make noble gases extremely stable and unlikely to form chemical bonds because they have little tendency to gain or lose electrons. So, noble gases cannot participate in ionic bond formation.
Answer:
Because they can't!
Explanation:
For ionic bonds, ions are needed to be made which are made to form a stable outer shell octet of electrons of each atom to gain atomic stability. The noble gases don't need to form ions since they already have the octet of electrons in their outer shells. If they don't form ions, they don't form ionic bonds too.
This is one of the reasons why noble gases are unreactive.
#giveathanks
What is the general formula for a secondary anime?
A. RNH2
B.H2NRNH2
C.RN2H
D.R2NH
Answer:
D.R2NH
Explanation:
The general formula of a secondary amine is given as:
R2NH
Amines are organic compounds that show an appreciable basicity. They are regarded as the derivatives of ammonia where one or two of the three hydrogen atoms has/have been replaced by the alkyl or aryl groups.
In a secondary amine, two hydrogen atoms of ammonia have been replaced by alkyl and or aryl groups.
Answer:
d. R2NH
Explanation:
edge 2021
which of the following is an example of a longitudinal wave
Answer:
Examples of longitudinal waves include: sound waves. ultrasound waves. seismic P-waves.
Explanation:
What are the different stages in the cell cycle? (hint: you should have six)
prophase, prometaphase, metaphase, anaphase, telophase and cytokinesis
Explanation:
2. Calculate the mass of Al(SO), in 250 mL of solution if the concentration
is 0.48 N.
Answer:
s
Explanation:
hi guys what is mean
Answer:
mean is something that rude
mean is when ur dont undetstand something and u say what do u (mean)
Explanation:
lol why dont u know this answer
Answer:mean is Vete a la mierda con tu pellizco mamá
Explanation:its something nice
How much of earth's freshwater is in the solid state or under ground?
That would be B: 33%, but please correct me if I'm wrong ^^
Answer:
that would be b:33 i believe pls dont blame met
what is this number called?
Answer:
Atomic mass i believe..
How do you compare the total mass of reactants to the total mass of the products when modeling an equation?
(8th Grade Science)
Answer:
Balance the stoichiometric amounts of both the reactants and the products.
6 CO2 + 6 H2O → C6H12O6 + __ O2
Answer:
co2 is the answer
Explanation:
I hope it helps you
The uncertainty in the measurement 1500 m is
Answer:
Its 1500 meters, which is equal to 0.9320568 miles. Hope this helps!
Explanation:
When 29 grams of sodium metal (Na) react with 49 grams of chlorine gas (C1), solid
sodium chloride (NaCl) is created in synthesis reaction. How much excess sodium OR
chlorine is left over?
Answer:
Explanation:
Na + Cl = NaCl
23 g 35.5 g
23 g sodium reacts with 35.5 g of chlorine
29 g of sodium reacts with 35.5 x 29 / 23 g of chlorine
= 44.76 g
So 44.76 g of chlorine reacts and 49 - 44.76 = 4.24 g of chlorine is left over .
All the sodium is used up in the reaction .
help me with this science question for brainiest:)
Answer:
solid liquid and gas
Explanation:
Answer: Forms: Liquid water, solid water (ice) and gaseous water (water vapor)
Explanation:
Obviously liquid water comes from the sink, ice can be found in the freezer, and water vapor comes from boiling water, it is always in the air around us.
Liquid water is used for hydration or for food preparation. Ice is used to cool things down or in drinks, and water vapor isn't really used by humans. Rather, it serves as a natural greenhouse gas.
An atom contains 8 protons, 8 neutrons and 10 electrons. A second atom
contains 9 protons, 10 neutrons and 10 electrons. What can be said about
these two atoms?
A. Both atoms are neutral
B. The atoms are isotopes of each other
C. Both atoms are ions
D. these atoms cannot exist in nature
Answer:
both atoms are ions
Explanation:
The effect on temperature on The rate of the reaction between marble chips hydraulic acid can be investigated by measuring The production of carbon dioxide
is it a b c or d
Answer:
D. Thermometer
Explanation:
The equipment used to measure the temperature of any reaction is the thermometer.
A thermometer is any device that has been specifically calibrated to measure the temperature values of reaction.
Temperature is the degree of hotness or coldness of a body. Cold bodies have very low temperature. Hot bodies have high temperatures. There are different types of thermometers in use for various purposes.Balance each of these equations.
A. NO + O2 NO2
B. Co + O2 Co2O3
C. Al + Cl2 Al2Cl6
D. C2H6 + O2 CO2 + H2O
E. TiCl4 + Na Ti + NaCl
Answer:
A. 2NO + O2 -> 2NO2
B. 4Co + 3O2 -> 2Co2O3
C. 2Al + 3Cl2 -> Al2Cl6
D. 2C2H6 + 7O2 -> 4CO2 + 6H2O
E. TiCl4 + 4Na -> Ti + 4NaCl
Scientist use alternative ways to seek out if a fault is active which one isn't include
Answer:
Geologists commonly consider faults to be active if there has been movement observed or evidence of seismic activity during the last 10,000 years. Active faulting is considered to be a geologic hazard - one related to earthquakes as a cause.
Explanation:
Plz mark brainliest thanks
What are the 4 main types of tissues in the human body?
Answer: nervous tissue connective tissue epithlial tissue muscle tissue
Explanation:
