Answer:
True
Explanation:
What would be the new pressure if 250cm3 of gas at standard pressure is compressed to a volume of 150 cm3
Answer:
5/3 or 1 2/3 atmospheres.
Explanation:
If the temperature is kept constant then P*V will be constant.
The standard pressure is 1 Atm. so:
250 * 1 = 150 * V
V = 250 / 150
= 5/3 Atm.
The new pressure of gas is 126.66 mm Hg at constant temperature according to Boyle's law.
What is Boyle's law ?
Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Mathematically, it can be stated as,
P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.
According to the equation the unknown pressure and volume of any one gas can be determined if two gases are to be considered.That is,
P₁V₁=P₂V₂
∴P₂=760×250/150=126.66 mm Hg
Therefore, the final pressure of the gas is 126.66 mm Hg.
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Is calcium carbonate an acid or alkaline
Calcium carbonate is neither acid nor base, it's a SALT.
Answer:
none,It is a salt of the calcium, ion a strong base and carbonic acid, a very weak acid. Answer: calcium carbonate is a salt, it is neither acid nor base
Which step in the scientific method requires you to use your senses to obtain information?
Answer:
The answer is Observation.
For you to observe the things around you then you need to use all your sense organs....
Answer: making an observation.
Which molecule has a single covalent bond between its atoms?
[Proton number: He=2, N=7, O=8, F=9]
Answer:
F
Explanation:
Helium (He) has 2 protons. Since the number of protons and electrons are the same, it also has 2 electrons. This means that it's first electronic shell is full and the particle is stable. There is no bonding between these atoms to form molecules.
Nitrogen (N) has 7 protons which is also 7 electrons. After filling the first shell (2), it will still have 5 electrons. The atom will share 3 electrons with another nitrogen atom. This will form 3 covalent bonds.
Oxygen (O) has 8 protons which is also 8 electrons. After filling the first shell (2), it will still have 6 electrons. The atom will share 2 electrons with another oxygen atom. This will form 2 covalent bonds.
Fluorine (F) has 9 protons which is also 9 electrons. After filling the first shell (2), it will still have 7 electrons. The atom will share 1 electron with another fluorine atom. This will form 1 covalent bond aka a single covalent bond.
(5.93 x 103) (2.3 x10-2)
Answer:
when you multpily or divide powers of 10 you just add or subratact respectivley
Explanation:
(5.93 x 10 ^ 3) (2.3 x 10^ -2) = (5.93 * 2.3 ) x 10 ^ 3 +(-2)
= 13.639 x 10 ^ 3-2
= 13 . 639 x 10
1.3639 x 10^2
If an object has a density of 0.55 g/mL, what is its density in g/L (PLEASE HELP)
Answer:
glycerin
Explanation:
the amind acid of glycrine is 0.18 g/MLA.
How to make baking powder
Answer:
nahco3
Explanation:
Name two factors that affect the force of friction
Answer:
inertia and force
Explanation:
the inertia allows objects to move and force makes an object move
Which of the answer choices provides an accurate example of how knowledge of nuclear reactions has been used to benefit society
select all that apply.
1.Radiation in correct doses may be able to prevent and treat illnesses caused by viruses, such as HIV and influenza.
2. Nuclear fusion can be easily activated and controlled in nuclear power plants and harnessed to generate clean electricity.
3. Controlled fission chain reactions can be used to produce electricity in a nuclear-powered submarine.
4.Medical imaging devices use radioactive elements with short half-lives to see through the human body and diagnose patients.
Answer:
Controlled fission chain reactions can be used to produce electricity in a nuclear-powered submarine.
4.Medical imaging devices use radioactive elements with short half-lives to see through the human body and diagnose patients
Explanation:
A submarine uses nuclear vision as a source of energy. The heat from controlled nuclear fission reactions produces steam which drives a steam turbine to power the submarine.
In the area of medicine, medical imaging is becoming a popular technique for diagnosis of many illnesses. These radioactive elements with short half lives are used to see through the human body for the purpose of diagnosis.
Paper clips are made of stainless steel. Steel is a mixture. There are different kinds of steel that have slightly different ratios of substances. Stainless steel is made of iron mixed with high-density metals. Carbon steel is made of iron mixed with carbon, an element with a lower density than metals. Would you expect the density of stainless steel and carbon steel to be the same? Why or why not? Font Sizes
No, firstly bc stainless steel and carbon steel mixed with different things, high-density metals and carbon.
High-density metals and carbon both has different density which will affect the steel when they combined with iron. So it cant be the same.
Is hydrogen gas a mixture or pure substance?
Answer:
pure hydrogen is a pure substance even though it consists of many different types of molecules. what makes it pure substance is that it is free from contamination.
Equal masses of water undergo condensation, deposition, evaporation, and sublimation. a) Which process releases the most energy? b) Which process absorbs the most energy?
Answer:
A. Condensation
B. Evaporation
Explanation:
Condensation releases energy when water vapor condenses to form water droplets. Evaporation absorbs energy whenever it changes from liquid to gas, the heat from the sun heats the water up and absorbs energy.
1. What keeps a star from breaking apart ?
what is the electrons...
Electrons are negativity charge particle found in an atom. His twine is Proton who is positively charged
What is not a product of modern chemistry ?
Answer:
Modern chemistry describes the composition, structure, and physical and chemical properties of substances. ... The main aim of modern chemistry is to improve the communication and conversation among the scientists, researchers, engineers, and policymakers, who are working under the area of modern chemistry
Explanation:
I hope this helps you!!
Which subatomic particle weighs virtually zero? Electron Neutron Proton
Answer:
1) Electron
Explanation:
The mass of an electron is only about 1/2000 the mass of a proton or neutron, so electrons contribute virtually nothing to the total mass of an atom.
Iron has a density of 7.87mL. How much mass would a 12.3mL sample contain?
The correct answer is 96.80 grams
Explanation:
The density of a substance shows the total mass the substance contains in 1 mL or 1 cm3 as density is calculated by using the formula D= M (mass) / V (volume). This implies, Iron contains 7.87 grams per milliliter. Moreover, this value and formula can be used to calculate the mass or volume of any other sample. The process to calculate the mass of an iron sample with a volume of 12.3 mL is shown below.
D = M ÷ V
7.87 mL = x ÷ 12.3 mL - x represents the missing value. Now find the value of x by solving the equation
x = 7.87 · 12.3
x = 96.80
This means a sample of 12.3 mL contains a mass of 96.80 grams. Also, you can know this value is correct because if you divide the mass by the value the density is the same (96.80 grams ÷ 12.3 mL = 7.87 g/mL)
What is the percent yield for a certain reaction when 56.8 g of product was
obtained in the lab, but the theoretical yield was 64.4g?
Answer:
88.20%
Explanation:
% yields =( experimental yield /theoretical yield )x100%
= ( 56.8 ÷ 64.4 ) x100%
= 88.20%
The percent yield for the given reaction where in the product obtained is 56.8 g is 88.19%.
What is percent yield?Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.
In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .In the given example , percent yield=56.8/64.4×100=88.19%.
Thus, the percent yield of reaction is 88.19 %.
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Every object in the universe experiences some sort of force. It could be gravity holding Earth in orbit around the sun, or it could be someone sliding a chair across the floor. What best describes a force?
Answer:
See explanation
Explanation:
A force may be defined as a push or pull on an object as a result of its interaction with another object.
Thus, interaction between two objects is only possible because of the action of a force on each of the objects due to interaction between the objects.
For instance, the earth remains in its orbit due to the gravitational force of attraction between the earth and the sun. Many more examples of forces abound in science.
What physical changes occured while you ate breaskfast?
What chemical changes occured while you ate breakfast?
Answer: your body converts the food into energy and gets rid of the uneeded stuff
Explanation: A physical change is a change that doesn't create a new substance or change the substance. Usually this involves a size or shape change. ... A chemical change is a change that creates a new substance or changes the substance. Usually, this involves color change, temperature change, and/or a new substance being formed.
hope this helps
The magnesium atom has 12 electrons arranged 2,8,2. What must the atom do to become stable? gain 6 electrons a.lose 6 electrons b.gain 2 electrons c.lose 2 electrons
Answer:
The answer is Gain 6 electrons.
Explanation: The reason for this is that for electrons to be stable, you need a valence shell of 8 electrons. Since it is arranged 2, 8, 2 , the outer shell is 6 less than 8 meaning it needs to gain 6 electrons.
When you freeze water, it turns to ice. What process is this? *
Answer:
Freezing
Explanation:
Freezing is the process in which a liquid changes to a solid. It occurs when a liquid cools to a point at which its particles no longer have enough energy to overcome the force of attraction between them. The freezing point of a substance is the temperature at which it freezes. The freezing point of pure water is 0°C.
Answer:
freezing
Explanation:
Once it gets cold enough (around 32 degrees Fahrenheit), the expanding water molecules begin to form ice crystals. This spreading-out of water molecules as it freezes is why sometimes a bottle full of water will break when you freeze it. The fact that water expands when frozen is also really important to life on Earth.
What are the limitations of J.J. Thomson's model of the atom?
Explanation:
thanks for the points big man
As an organism begins to learn more and more about its environment, it will begin to construct a complex mental representation of that data called a _____
Latent map
Cognitive redux
Cognitive map
Latent redux
Answer:
Cognitive map
Explanation:
A cognitive map is a mental representation of one's physical environment.
Cognitive Map
Explanation:
As an organism begins to learn more and more about its environment, it will begin to construct a complex mental representation of that data called a Cognitive Map
what are two examples of natural laws in science
Answer:
Another example of a natural law in physics is Ohm's law that describes the relationship between voltage (V), current (I), and resistance (R). Natural laws are also found within chemistry. One of the most important laws in chemistry is the law of conservation of matter.
True or False: When you measure something with a ruler, you should NOT estimate an extra digit. You only need to report the numbers you see on the ruler.
Answer:
False
Explanation:
It is important to give exact measurements.
explain how heat is exchanged through potential and kinetic energy
Answer:
Kinetic And Potential Energy Working Together All forms of kinetic energy are the result of a previous state of potential energy. For example, the stored chemical potential energy of a battery converts to electrical kinetic energy to transport electricity to a light bulb, which radiates thermal kinetic energy.
Explanation:
A desk measures 42 inches long. How many meters is that?
Answer:1.067
Explanation:
look it up
which is a example of a three dimensional measurement of volume a. 120 cubic meters b. 120 grams c. 120 miles per hour d. 120 units pls help I'm not smart
Answer:
120 cubic meters
Explanation:
Three-dimensional measurement is basically any unit of measurement cubed. Since grams is just to the first power, it is not considered three-dimensional. miles per hour is a fraction, so it is not a three-dimensional measurement of volume. 120 units are to the first power, so you are left with 120 cubic meters, which is a three-dimensional measurement of volume. Also, another way to solve this is to look at the types of measurement. The cubic meter is a measure of volume. Grams are a measurement of mass. Miles per hour is a measurement of speed. Units can be any type of measurement because you can substitute units instead of any measurement in questions.
SOLVE The density of a gas is 0.68 g/mL. What amount of space would 23.8 g of this gas occupy?
Answer:
The answer is 35 mLExplanation:
Density of a substance can be found by using the formula
[tex]Density(\rho) = \frac{mass}{volume} [/tex]
From the question we are finding the amount of space the gas will occupy that's the volume of the gas
Making volume the subject we have
[tex]volume = \frac{mass}{Density} [/tex]
From the question
mass = 23.8 g/mL
Density = 0.68 g/mL
Substitute the values into the above formula and solve
That's
[tex]volume = \frac{23.8}{0.68} [/tex]
We have the final answer as
35 mLHope this helps you