it stays exactly the same
Answer:
During a physical change, items may change, but the mass is the same.
_____ is a measure of the average kinetic energy of a gas. Density Enthalpy Pressure Temperature
Answer:
Temperature
Explanation:
Temperature is a measure of the average kinetic energy of the particles in a sample of a gas.Kinetic energy is the energy possessed by an object because of its motion. As an object absorbs heat the particles move faster so the average kinetic energy and therefore the temperature increases.When the temperature of a body or an object is increased and hence the heat, there is more movement or vibration of particles which translates to more kinetic energy.Answer: The correct answer is Temperature.
Explanation:
Temperature is a measure of the average kinetic energy of the particles in a sample of a gas.
Which of the following is similar among all living organisms on Earth?
A. cellular function
B. social behavior
C. physical appearance
D. all of these
A. cellular function
hope this helps :)
How many grams of product are formed? (Remember the law of conservation of mass) A(20) B(17) C(31) D(34)
Answer: I believe it is B.
What is the center of the atom called?
A. Electron
B.Neutron
C.Nucleus
D.Proton
What is the missing coefficient ?
The missing coefficient in this chemical equation will be the number that makes the number of Carbons and Oxygens equal on both sides. To start, we can tally what we have so far and then we can figure out what number we need.
2 C8H18 + 25 O2 --> ____ CO2 + 18 H2O
On the left, we have 16 Carbons, 36 Hydrogens, and 50 Oxygens.
On the right, we have 36 Hydrogens and 18 Oxygens (as of now).
This means we need 16 Carbons and 32 Oxygens on the right side of the equation to make the individual numbers equal; this can be accomplished by putting 16 as the CO2 coefficient (this adds 16 Carbons and 32 Oxygens). To check yourself, re-count the number of each atom on each side.
Left: 16 Carbons, 36 Hydrogens, 50 Oxygens
Right: 16 Carbons, 36 Hydrogens, 50 Oxygens
The numbers on both sides are equal, so 16 satisfies the CO2 coefficient and the chemical equation is now balanced. We're done!
Hope this helps!
If the [H+] changed from [1 x 10-7] to [1 x 10-4], what is the new [OH-]?
1 x 10-7
1 x 10-4
1 x 10-3
1 x 10-10
Answer:
1 x 10^-10 M
Explanation:
We know that;
[H+][OH-] = 1 × 10^-14
Therefore;
when [H+] is 1 x 10^-7 then [OH-] will be;
= [1 × 10^-14]/[1 x 10^-7]
= 1 x 10^-7
When the [H+] changes from 1 x 10^-7 to [1 x 10-4]
then the [OH-] will change from 1 x 10^-7 to;
= [1 × 10^-14]/[1 x 10^-4]
= 1 x 10^-10 M
Thus; the new [OH] is 1 x 10^-10 M
which of the following compounds has the highest oxygen content by weight?
The molecular weight is 18, and 16 of that is oxygen.
So, water is 16/18 * 100 = 88.9% oxygen by weight.
None of the other compounds have as high an oxygen content (by weight) as water.
This is a trick question, and the University Chemistry grad fell for it.
If you have the same weight of each compound (let's say, 10 grams, for example), then H2O has the most oxygen weight (8.89 g).
Answer:
This question is incomplete. The completed question is below
Which of the following compounds has the highest oxygen content, by weight? a. NaO b. CO c. BaO d. H₂O
The correct option is d. H₂O
Explanation:
The percentage of oxygen by weight in NaO is
atomic mass of sodium (Na) is 23 g/mol while that of oxygen is 16 g/mol
molar mass of NaO = 23 + 16 = 39g
% by mass of oxygen = 16/39 × 100 = 41.03 %
The percentage of oxygen by weight in CO is
atomic mass of carbon (C) is 12 g/mol while that of oxygen is 16 g/mol
molar mass of CO = 12 + 16 = 28g
% by mass of oxygen = 16/28 × 100 = 57.14 %
The percentage of oxygen by weight in BaO is
atomic mass of barium (Ba) is 137 g/mol while that of oxygen is 16 g/mol
molar mass of BaO = 137 + 16 = 153g
% by mass of oxygen = 16/153 × 100 = 10.46 %
The percentage of oxygen by weight in H₂O is
atomic mass of Hydrogen (H) is 1 g/mol while that of oxygen is 16 g/mol
molar mass of H₂O = (2 × 1) + 16 = 18g
% by mass of oxygen = 16/18 × 100 = 88.89 %
From the above calculations, it can be deduced that H₂O has the highest oxygen content by weight
The Gulf Stream is a current that carries water north along the eastern coast of the United States. Which of the following describes the flow of water in the Gulf Stream?
A.
Cool water follows a path to join other cool water.
B.
Warm water follows a path to join other warm water.
C.
Warm water is carried to cooler parts of the ocean.
D.
Cool water is carried to warmer parts of the ocean.
The correct answer is - C. Warm water is carried to cooler parts of the ocean.
The Gulf Stream is warm ocean current. It is an ocean current that originates from the Caribbean region, where it is constantly warm throughout the year. Because of that, the water is warm as well, and since the warm water is less dense, it moves on the surface. The movement is toward the higher latitudes, where this current, as a surface movement of the water, is bringing warmer water to the cooler areas, such as the eastern coast of the United States. Not only that warm water is brought to these areas, but the Gulf Stream also brings in warm and moist air masses with it, making the climate much more mild, and increasing the amount of precipitation.
Answer:
c :warm water is carried to cooler parts of the ocean!!!!
Explanation:
on study island this was right!!!! hope this helped!!;)
Why do crocodiles walk so gayly?
I swear they walk like they got their nails done or something
Answer:
who knows why they could be or not or maybe they girl crocs and just got there nails done
Animals like crocodiles have different ways of moving depending on their body structure, how their bodies work, and how they have evolved over time.
Why do crocodiles walk so gayly?Crocodiles have a special way of walking that is affected by how their legs are built and where they live. They can move smoothly both in water and on land.
This unique way of walking is a result of their evolutionary adaptations for life in aquatic and semi-aquatic environments. In water, crocodiles use powerful tail movements for propulsion, and on land, they can move swiftly and silently to capture prey or protect their territory.
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Study the image. Which region has the highest elevation
Can you please provide an image it would help more than you know
Answer:
THIS IS THE IMAGE IF THIS HELPS
A company is developing a new type of airplane that can take off like a helicopter. Before they begin manufacturing the airplanes in a large scale, they first build a prototype. What is the main purpose of building a prototype? A: to find a market in which to sell the product B: to train factory workers about how to make the product on a large scale C: to make sure the design works as expected D: to show future customers what the product will look like?
C, to make sure the design works as expected.
A prototype is first, typical model of the said product. Hope this helps!
Answer:
c
Explanation:
Which statement would indicate the presence of an acid? It tastes bitter.. It does not react with active metals. It reacts with active metals to form a gas. It does not change the color of litmus paper
Answer: Option (C) is the correct answer.
Explanation:
Acids are the species which donate a proton or hydrogen ion.
Properties of acids are as follows.
Acids are sour in taste.
They turn blue litmus red.
They react with metals to form a gas.
pH of acids is less than 7.
Acids have a sticky texture.
Answer:
C. It reacts with active metals to form a gas.
Explanation:
edg. 2021
What happens in an oxidation half-reaction?
A.
Elements gain electrons.
B.
Elements lose electrons.
C.
Oxygen is added.
D.
Oxygen is lost.
B.
Elements lose electrons.
Which of the following is true for balancing equations? A. The number of products should be equal to the number of reactants. B. The properties of products should be the same as the properties of reactants. C. There must be as equal number of compounds on both sides of the equation. D. There must be as equal number of atoms of each element on both sides of the equation.
D.) There must be an equal number of atoms of each element on both sides of the equation
Answer: The correct answer is Option D.
Explanation:
Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another.
In a chemical reaction, total mass on the reactant side is equal to the total mass on the product side.
It can also be stated that total number of individual atoms on the reactant side must be equal to the total number of individual atoms on product side.
For Example: Formation of water from hydrogen and oxygen gas.
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
On reactant side:
Number of Hydrogen atoms = 4
Number of Oxygen atoms = 2
On product side:
Number of Hydrogen atoms = 4
Number of Oxygen atoms = 2
Hence, the correct answer is Option D.
3,7-dibromo-4,6-dichloro oct-5-ene-1,2-diol. --- show its structure by photo.
Explanations:- Looking at the given name, the parent chain name is Oct and Oct stands for eight carbons.
The suffix -ene at number 5 stands for a double bond between carbon number 5 and 6.
Bro stands for Br. Since the name has dibromo means there are two Br at number 3 and 7 carbons.
Similarly, there are two Cl at number 4 and 6 carbons.
Suffix -ol is used for OH group. The given name has 1,2-diol means there are two OH groups at number 1 and 2 carbons.
So, to draw the structure of the compound we put 8 carbons in a chain and then but a double bond between number 5 and 6 carbons. Put OH at number 1 and 2 carbons, put Br at number 3 and 7 carbons and Cl at number 4 and 6 carbons. If any of the carbons octet (four bonds) is still incomplete then we attach H atoms to it.
So, the structure of the compound is as given below:
Which statement describes potential energy? A. energy of motion B. stored energy C. energy due to heat D. used energy
A. Energy of motion describes potential energy
B is the answer.
potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.
A metallurgist reacts 320.0 grams of 75.0% by mass silver nitrate solution with an excess of copper metal. How many grams of silver metal can the metallurgist produce during the process?
Cu(s) + AgNO3 → Ag(s) + Cu(NO3)2
97.5 grams
125 grams
149 grams
152 grams
Answer:
= 152.40 g
Explanation:
The equation for the reaction is;
Cu(s) + AgNO3 → Ag(s) + Cu(NO3)2
Mass of silver nitrate = 320.0 g × 0.75
= 240.0 g
Molar mass of silver nitrate = 169.87 g/mol
Therefore;
Moles of silver nitrate = 240.0 g/169.87 g/mol
= 1.413 moles
Mole ratio of Silver nitrate to silver metal = 1 : 1
Therefore, moles of silver metal = 1.413 moles
Hence;
Mass of silver metal = 1.413 moles × 107.868 g/mol
= 152.40 g
To determine the amount of silver metal produced, use stoichiometry and the given information to convert the mass of silver nitrate solution to moles, use the mole ratio from the balanced equation to find the moles of silver, and then convert the moles of silver to grams using the molar mass of silver. The metallurgist can produce 152 grams of silver metal.
Explanation:To determine the amount of silver metal that can be produced, we need to use stoichiometry and the given information. The balanced equation tells us that 1 mole of copper reacts with 1 mole of silver nitrate to produce 1 mole of silver. Therefore, we can convert the given mass of the silver nitrate solution to moles and then use the mole ratio to find the moles of silver produced. Finally, we can convert the moles of silver to grams using the molar mass of silver.
Step 1: Convert the mass of silver nitrate solution to moles using its molar mass.
Step 2: Use the mole ratio from the balanced equation to find the moles of silver produced.
Step 3: Convert the moles of silver to grams using the molar mass of silver.
Using these steps, we can calculate the amount of grams of silver metal produced, which is 152 grams.
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When forming a chemical bond only the
blank electrons participate in the bonding process
A chemical bond is created by either the transfer or sharing of electrons. Electrons with a missing full outer shell will be the ones participating in the bonding process. Hope this helped :)
How many grams are there in 6.02x10^23 molecules of Na(NO3)3?
there are 12 grams in 6.02x10^23 molecules of Na(NO3)3?
HELP URGENT!!!!!
Which of these is part of the inner ear?
1. tympanic membrane
2. the ossicles
3. organ of Corti
4. external auditory meatus
The answer is 4. (The word auditory always has something to do with hearing or the ear.)
Which of the following is true about the weight of an object?
A. It remains same for the object.
B.It cannot be measured accurately.
C. It is a force acting on the object.
D.It is always less than the mass of the object.
C because weight has the force of gravity pulling you down
At what point on the hill will the car have zero gravitational potential energy? A) Half-way down the hill. B) At the top of the hill. C) At the bottom of the hill. D) It will never have zero gravitational potential energy
I think it’s c cause height is what determines gravitational potential energy
Answer:
its at the bottom just got it right on usa test prep <3
Explanation:
all of the following are evidence of chemical changes EXCEPT:
A) Talking antacid for heartburn
B) Cooking steak
C) Salt dissolving in water
D) Grass growing
Answer:
d) grass growing
Explanation:
i believe because everything else has something happening where it wasn't the same as before but grass is still the same color texture but its just longer
Out of the given options, the only process that does not involve a chemical change is salt dissolving in water. Salt merely changes its physical state, not its chemical identity, when it dissolves into water, thus representing a physical change.
Explanation:All of the mentioned options are examples of a chemical change except for one, which is a physical change. A chemical change is a process where one or more substances are transformed into new substances with different properties. Examples include taking an antacid for heartburn (A), as the antacid reacts chemically with stomach acid; cooking a steak (B), which includes the Maillard reaction, a chemical process; and grass growing (D), as it involves photosynthesis, a chemical process.
A physical change, on the other hand, is a type of change in which the form of matter is altered but one substance is not transformed into another. The correct answer is C) Salt dissolving in water. In this case, the salt (sodium chloride) simply changes its state from solid to liquid but not its identity. After all, if the water were to evaporate, you'd be left with the salt crystal structure again intact. Thus, this is not a chemical change but a physical one.
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What is the theoretical yield of ethyl chloride in the reaction of 27.17 g of ethylene with 58.33 g of hydrogen chloride? (For ethylene, MW=28.0 amu; for hydrogen chloride, MW=36.5 amu; for ethyl chloride, MW=64.5 amu.) Report your answer to the nearest hundredth of a gram without units.
H2C=CH2 + HCl → CH3CH2Cl
The theoretical yield of ethyl chloride, given 27.17 g of ethylene and 58.33 g of hydrogen chloride, is 62.67 grams.
Explanation:The first step in calculating the theoretical yield is to find the number of moles of each reactant. Given the masses and molecular weights, we find that there are 0.97 moles of ethylene and 1.6 moles of hydrogen chloride. The balanced equation shows that the reaction occurs in a 1:1 ratio, so the limiting reactant is ethylene as we have less of it.
The theoretical yield is therefore based on the amount of ethylene. Given the molar mass of ethyl chloride (64.5 amu), the theoretical yield would be the number of moles of ethylene multiplied by the molar mass of ethyl chloride. Therefore, the theoretical yield of ethyl chloride is 62.67 grams (rounded to the nearest hundredth without units).
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The theoretical yield of ethyl chloride from the reaction of 27.17 g of ethylene with 58.33 g of hydrogen chloride is 62.61 g. Ethylene is the limiting reactant, and the yield is calculated using its moles and the molar mass of ethyl chloride.
To calculate the theoretical yield of ethyl chloride, we need to first determine the limiting reactant between ethylene and hydrogen chloride. We then use stoichiometry to find how much product can be formed from that limiting reactant.
First, calculate the moles of each reactant:
Moles of ethylene (C2H4) = 27.17 g / 28.0 g/mol = 0.9706 molMoles of hydrogen chloride (HCl) = 58.33 g / 36.5 g/mol = 1.5981 molThe stoichiometry of the reaction is 1:1, so:
0.9706 mol of ethylene requires 0.9706 mol of HCl to react completely.Since we have more moles of HCl (1.5981 mol) than ethylene (0.9706 mol), ethylene is the limiting reactant. Now, we calculate the theoretical yield based on the moles of ethylene:
Theoretical yield of ethyl chloride (CH3CH2Cl) = 0.9706 mol * 64.5 g/mol = 62.6137 g
Therefore, the theoretical yield of ethyl chloride is 62.61 g when rounded to the nearest hundredth of a gram.
What is the percent composition of each element in S2Br
Get the molar mass of each element and since there are two S for each Br, make it 2x32.06 + 1x79.90 and then for S2, you would get 64.12/144.02 which is 44.52% S2 and then 55.48% Br
During which segments are two states of matter present?
The answer is D). 2,4
Answer: D) 2,4
Explanation:
The Barton Springs salamander lives only at the spring outflows of Barton Springs near Austin, Texas. They are often found under rocks or among gravel in water several inches to fifteen feet deep. They can also be found hiding in aquatic plants and algae. They rely on a clear, clean, continuous flow of spring water. They are known to eat amphipods (tiny aquatic crustaceans) and other small aquatic animals. The Barton Springs salamander is clearly capable of living underground, but also inhabits surface environments.
What is the MOST likely way that humans could have a damaging impact on the Barton Springs salamander?
Question 2 options:
Adding new water vegetation
Adding new crustaceans
Polluting the water
Floating down the river
Polluting the water would be the most likely way that humans would endanger them
In an ecosystem where Barton Springs inhabit polluting the water could have a damaging impact on the Barton Springs salamander.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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According to the law of mass action,what must be equal at equilibrium?
Answer:
The mass action law states that if the system is at equilibrium at a given temperature, then the following ratio is a constant. The square brackets "[ ]" around the chemical species represent their concentrations. This is the ideal law of chemical equilibrium or law of mass action.
Explanation:
Final answer:
The law of mass action states that the equilibrium constant must be equal at equilibrium.
Explanation:
The law of mass action states that at equilibrium, the ratio of the concentrations of the products to the concentrations of the reactants is constant. This constant is known as the equilibrium constant (Keq), and it must be equal at equilibrium. The equilibrium constant expression is based on the balanced chemical equation for the reaction and relates the concentrations of the products and reactants.
when fossils fuels are burned what is their chemical potential energy converted into?
This is transformed into electrical energy by the spinning of the turbines.
It would become electrical energy
James Proton prepares a saturated solution of sodium chloride in a beaker by adding solid sodium chloride and stirring. When James finishes, crystals of sodium chloride are observed at the bottom of the beaker. Which statement is true regarding the solution?
A. The concentration of sodium ions is constantly changing.
B. The concentration of chloride ions is constantly changing.
C. Solid sodium chloride never dissolves to form sodium ions and chloride ions.
D. Sodium ions and chloride ions collide and combine to form solid sodium chloride.
Your answer is choice C. That is solid sodium chloride never dissolves to form sodium ions and chloride ions.
Going further to explain, have a look at the question again, we are told that James Proton prepares a saturated solution of sodium chloride in a beaker by adding solid sodium chloride and stirring.
Then when James finishes, crystals of sodium chloride are observed at the bottom of the beaker.
This implies that no more salt was dissolving since the saturation point was reached.
Again suppose he increased the temperature of the reaction, more salts could have dissolved.
Correct option is D. The solution has reached equilibrium, meaning the concentration of sodium ions and chloride ions remains constant, and recrystallization occurs as these ions collide and combine to form solid sodium chloride.
When James Proton prepares a saturated solution of sodium chloride and observes crystals at the bottom of the beaker, the solution has reached a point of equilibrium where the dissolution of solid sodium chloride into sodium ions (Na+) and chloride ions (Cl-) is equal to the rate of recrystallization where these ions recombine to form solid sodium chloride. This equilibrium state means that the concentration of sodium ions and chloride ions in the solution remains constant, not constantly changing. Hence, options A and B are incorrect. Option C is also incorrect since the observation of crystals indicates that dissolution did occur before reaching saturation. The correct statement regarding the solution is D: Sodium ions and chloride ions collide and combine to form solid sodium chloride, which is an explanation of the recrystallization process occurring at equilibrium in a saturated solution.