A closed system permits only energy to enter or exit, not matter.
A closed system is a fundamental concept in physics and chemistry. It is defined as a system where matter cannot enter or exit, but energy can still be exchanged with its surroundings. For instance, consider a beaker covered with a glass lid. While heat can pass through the glass, water vapor cannot escape, thus maintaining the amount of matter inside the beaker constant. This helps in studying various thermodynamic processes without the interference of external matter exchange.
In which situation will the reaction rate increase
Answer:
A) when a catalyst is added
Explanation:
The missing options are:
A) when a catalyst is added
B) when the temperature drops
C) when the pressure is lowered
D) when the molecules are large and bulky
A catalyst increases the rate of a chemical reaction without undergoing a permanent chemical change. They provide an alternative pathway to the reaction which has a lower activation energy than the non-catalyzed mechanism, this increase the reaction rate.
science question down below
PLEASE ANSWER ASAP!
A golf ball is at rest on the grass. What must happen to cause the ball to move?
A balanced net force must be applied.
An unbalanced net force must be applied.
The net force must be zero.
The net force must be greater than the applied force.
An unbalanced net force must be applied.
what is mitosis. do in your own words plz
The chemical properties of a substance relate to how matter reacts with decays into or physically changes into I need help figuring out if it reacts with chemical properties or decays into or either physically changed into
Xanax is used to treat anxiety and panic disorders. The dosage strengthh is for each tablet is 0.5 mg. If 1000 micrograms=1 milligram, then how many micrograms arr there in each tablet?
What organisms are most of the life forms you can see
List the two main types of energy.
Answer: kinetic and potential energy
Explanation:
kinetic is energy of motion
energy that can move
potential is stored energy
energy that cant move
100% correct
at approximately what latitude do new york massachusetts and connecticut meet
Answer:
About 42° North latitude
Explanation:
Latitudes are defined as the lines that oriented in the east-west direction and they are parallel to the equator.
The 3 cities of the United States namely Massachusetts, New York, and Connecticut are on its eastern side The city of Connecticut, New York, and Massachusetts are situated at about (41.60° N and 73.09° W), (40.71° N and 74.01° W) and (42.41° N and 71.33° W) respectively.
These 3 cities are located adjacent to one another and they share a common point at a longitude of about 42° in the Northern hemisphere.
Thus, the above cities meet at about 42° N latitude.
Which process represent one chemical change and one physical change
what is the chemical formula for flint
Bases turn litmus paper what color?
a) red
b) blue
c) yellow
d) pink
Answer is: b) blue.
Neutral litmus paper turns red in acidic solutions and turns blue in alkaline solutions. At neutral pH, litmus paper does not change color.
Acids and bases have opposite properties and have the ability to neutralize each other. Acids taste sour, give sharp stinging pain in a wound and react with metals to produce hydrogen gas.
Bases turn red litmus paper blue and acids turn blue litmus paper red.
Please help ASAP!
Question and answers below in the picture.
Which occurs whenever valence electrons are shared or transferred between atoms
A. A Decrease in change
B. Radioactive decay
C. An increase in change
D. A chemical reaction
Final answer:
Correct answer - D. Whenever valence electrons are transferred between atoms, a chemical reaction occurs, leading to the formation of ionic or covalent bonds and the creation of ions.
Explanation:
The occurrence described in the question, where valence electrons are shared or transferred between atoms, corresponds to option D, A chemical reaction. This is a central concept in chemistry where elements interact to form compounds. When an atom gains or loses electrons, it becomes an ion: a cation if it loses electrons (and therefore has a positive charge), or an anion if it gains electrons (resulting in a negative charge). The transfer of electrons leads to the formation of ionic bonds, as seen in the production of table salt from sodium and chloride. When electrons are shared between atoms, this typically leads to the creation of covalent bonds.
what sphere extends from inside earths crust to the lower atmosphere
The Biosphere is the sphere that extends from inside Earth's crust to the lower atmosphere. It is a global ecosystem composed of living organisms and their nonliving surroundings. This includes all places where life exists, from deep in the ground, through land and water surfaces, to the lower atmosphere.
Explanation:The sphere that extends from inside Earth's crust to the lower atmosphere is known as the Biosphere. The Biosphere encapsulates all parts where life exists, starting from deep in the Earth's crust, through surface land and bodies of water, up to the lower atmosphere. It is a global ecosystem composed of living organisms (biota) and the abiotic (nonliving) factors from which they derive energy and nutrients.
Examples of places within the Biosphere include subterranean regions, forests, oceans, lakes, rivers, and the air around us. All living organisms, from the smallest bacteria to the largest trees and animals, are a part of the Biosphere.
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a 20 mL pipet sample of alcohol is found to weigh 15.71 g. What would be the mass of 35.25 mL of the same alcohol? What volume would 125.4 g of this alcohol occupy
Final answer:
To calculate the mass and volume of alcohol based on its density, we use basic principles of chemistry. The mass of 35.25 mL of alcohol is found to be approximately 27.69 g, and 125.4 g of the same alcohol would occupy approximately 159.65 mL.
Explanation:
The question involves calculating the mass of a certain volume of alcohol given its density and vice versa. First, we find the density of the alcohol using the initial 20 mL sample which weighs 15.71 g. The density (ρ) is mass (m) divided by volume (V), so ρ = 15.71 g / 20 mL = 0.7855 g/mL. Using this density, we can find the mass of 35.25 mL of the same alcohol which would be ρ * V = 0.7855 g/mL * 35.25 mL = 27.687375 g. To find the volume 125.4 g of this alcohol would occupy, we use V = m / ρ = 125.4 g / 0.7855 g/mL = 159.65 mL.
Convert 2.0 mm3 to the unit m3.
a. 2.0 x 10-6 m3
b.2.0 x 10-3 m3
c.2.0 x 10-9 m3
d.2.0 x 103 m3
To convert from mm3 to m3, use the conversion factor of 1 m3 = 10^9 mm3. You then divide the given quantity in mm3 by this conversion factor to find its equivalent in m3, finding that 2.0 mm3 is equal to 2.0 x 10^-9 m3.
Explanation:In order to convert mm3 to m3, the relationship between the units is crucial. In this case, there are 1,000,000,000 (10^9) cubic millimeters in one cubic meter since 1 meter equals 1000 millimeters, you cube this to get the conversion in volume. Thus, the conversion factor would be 1 m3 = 10^9 mm3. Therefore, to convert 2.0 mm3 into m3, you divide the cubic millimeter by this conversion factor.
Formally, you perform the operation as follows:
Identify the conversion factor: 1 m3 = 10^9 mm3Divide the quantity in mm3 by the conversion factor. Resulting in: 2.0 mm3 / 10^9 = 2.0 x 10^-9 m3So, the correct answer is 2.0 x 10^-9 m3
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What two subatomic particles determine the charge of an atom?
Answer:
Protons and neutrons
Explanation:
Protons and neutrons are found in the nucleus of the atom.
Which one of the following electron transitions does not correspond to an absorbtion of a quanta of light?
1. n = 4 to n = 6
2. n = 7 to n = 5
3. n = 2 to n = 5
4. n = 2 to n = 6
5. None of the Above
Biotechnology seems to cause much controversy. Why is this field more likely to draw attention from the public?
a. Its processes require a large amount of energy, and the cost makes many upset.
b. Its results can greatly improve lives, but sometimes the consequences are negative.
c. It is very poorly understood by the majority of people, yet it receives much funding from the government.
d. It receives funding from private companies who stand to make huge profits at the expense of people who need it.
Answer: b.Its results can improve lives, but sometimes consequences are negative.
Explanation:
Biotechnology is a field of science which deals with use of technology and biological sciences to solve problems related to diseases, disorders, and improving the quality of organisms.
In this a practice of genetic engineering is petfomed in which the genome of organisms are manipulated so as to introduce a new gene or to delete a gene which is causing disease.
Sometimes the results of these scientific processes are good thus helps in increasing the yield of the organism (plant or animal), introduces new traits, helps in erradication of diseases or disorders and others. But sometimes the results are harmful for the organism like instead of recovering from disease the organism becomes susceptible to many diseases. Also with the introduction of new traits some beneficial traits are suppressed.
If 7.89 mL of a sodium hydroxide solution can neutralize 13.1 mL of 0.293 M HCl, what volume of 0.765 M HBr can be neutralized by 15.4 mL of the same sodium hydroxide solution?
Energy from the Sun is called
What mostly determines the chemical properties of the atom of an element
Answer: the electrons i.e their valence electron
Explanation: valence electron is the number of electron in the outermost shell of an atom. Infact it is the combining power of an element. The valence electron gives us a better understanding of how an element will react with other elements. This is the reason why elements with the same number of valence electron(s) are grouped together telling us that they exhibit similar chemical properties
Question 4(Multiple Choice Worth 4 points)
(01.01 MC)
Which question cannot be answered by science?
A) Why do rainbows appear after rain storms?
B) Which plants grow in the desert?
C) Why should endangered animals be protected?
D) What is the hardest element on Earth?
Answer: C) Why should endangered animals be protected?
Explanation:
A science is a discipline which can answer questions related to the cause of natural processes or events occurring in the natural world. The questions related to science can be answered by experimental procedures.
C cannot be answered by science as it is a question of moral question related to social ethics. The endangered animals if abolished will negatively reduce the biodiversity of the organisms living on earth.
Which of the following is not an intensive physical property? Magnetism Boiling point Thermal conductivity Volume
Answer:
Volume
Explanation:
Intensive properties do not depend on the mass of the matter whereas extensive properties do depend on the mass of the matter. Mass and volume are examples of extensive. Hence option D is correct.
Options A, B and C are incorrect as magnetism, boiling point and thermal conductivity are all intensive properties.
Option D is correct for your question.
An intensive physical property does not depend on the amount of matter. Following this rule, it's easy to see Volume is not an intensive physical property.
How many O2 molecules can be made with the oxygen from 492 g of sodium phosphate?
Final answer:
Without a chemical reaction formula, it's not possible to calculate the number of O2 molecules that can be made from 492 grams of sodium phosphate.
Explanation:
The number of O2 molecules made from 492 grams of sodium phosphate requires a stoichiometric calculation based on the chemical reaction involved. However, since no reaction is given, we cannot accurately determine the amount of O2 that could be produced from sodium phosphate. We would need the balanced chemical equation for the decomposition or reaction involving sodium phosphate to calculate the number of O2 molecules formed.
How does alternate freezing and thawing of water cause weathering to occur? Freezing chemically alters the rock surfaces Water expands when it freezes and cracks rocks open Thawing causes rock particles to move from place to place
Answer: I think water expands when it freezes and cracks rocks open
Explanation:
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Which pair of kingdoms include organisms which are all multicellular?
A. Animalia and Fungi
B. Animalia and Plantae
C. Protista and Fungi
D. Protista and Plantae
What is the difference between a heterogeneous mixture and homogeneous mixture?
Final answer:
The key difference is that a heterogeneous mixture is non-uniform with visible components, whereas a homogeneous mixture is uniform and components are not visibly distinct.
Explanation:
Differences Between Heterogeneous and Homogeneous Mixtures
A heterogeneous mixture consists of two or more substances and is non-uniform, meaning the individual components can often be seen and are not consistent throughout the mixture. Examples include sand and water, Italian dressing, and chocolate chip cookies. Homogeneous mixtures, on the other hand, are uniform throughout; the components are well mixed and indistinguishable. Examples include salt dissolved in water and air. These mixtures can also be solutions or colloids when the mixture has a consistent composition and appears uniform at the microscopic level.
In summary, the main difference lies in the uniformity of the mixture. Homogeneous mixtures are uniform in composition and phase, whereas heterogeneous mixtures have a variable composition and can often be separated into their individual components through physical methods such as filtration.
what is the number of valence electrons in sodium?