Which of the following best expresses the definition of a closed system? (2 points) Energy can enter or leave the system but matter cannot. Heat and matter are both able to enter or leave the system. Matter can enter or leave the system but energy cannot. Heat and matter can enter the system but cannot leave the system.
Answers
Related Questions
Which statement best describes gravity? (3 points)
a. It is the force that repels only very small objects.
b. It is the force that acts between objects with zero mass.
c. It is the force that sometimes acts only on very large objects.
d. It is the force that acts between any two objects in the universe.
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Answer:
option d
Explanation:
have a nice day
The force that acts between objects
please help me ill give brainiest
Answers
When the speed of the bottle is 2 m/s, the KE is kg m2/s2. When the speed of the bottle is 3 m/s, the KE is kg m2/s2. When the speed of the bottle is 4 m/s, the KE is kg m2/s2. When the speed of the bottle is 5 m/s, the KE is kg m2/s2. When the speed of the bottle is 6 m/s, the KE is kg m2/s2.
instructions
In this part of the experiment, you will be changing the speed of the bottle by dropping it from different heights. You will use the same mass, 0.250 kg, for each trial, so record this mass in Table B for each velocity. Then, calculate the expected kinetic energy (KE) at each velocity. Use the formula KE = mv2,
where m is the mass and v is the speed. Record your calculations in Table B of your Student Guide.
Answers
Answer:
Based on the given instructions, you need to calculate the expected kinetic energy (KE) at each velocity using the formula KE = mv^2, where m is the mass and v is the speed. The mass is given as 0.250 kg.
Table B: Calculation of Kinetic Energy (KE)
Table B: Calculation of Kinetic Energy (KE)
Speed (m/s)Mass (kg)KE (kg m^2/s^2)20.2500.50030.2500.75040.2501.00050.2501.25060.2501.500
To calculate the kinetic energy at each velocity, multiply the mass (0.250 kg) by the square of the velocity.
For example, when the speed of the bottle is 2 m/s: KE = (0.250 kg) * (2 m/s)^2 = 0.250 kg * 4 m^2/s^2 = 1.000 kg m^2/s^2
Perform similar calculations for the other velocities and record the results in Table B.
Answer:
Explanation:mass of the bottle in each case is M = 0.250 kg
now as per given speeds we can use the formula of kinetic energy to find it
1) when speed is 2 m/s
kinetic energy is given as
2) when speed is 3 m/s
kinetic energy is given as
3) when speed is 4 m/s
kinetic energy is given as
4) when speed is 5 m/s
kinetic energy is given as
5) when speed is 6 m/s
kinetic energy is given as
Simple and complex molecules are similar in that they both involve ____ atoms A water B simple C bonded D complex
Answers
Answer:
The answer is C.
Explanation:
Please give brainliest
Answer:
D
Explanation:
complex, in chemistry, a substance, either an ion or an electrically neutral molecule, formed by the union of simpler substances (as compounds or ions) and held together by forces that are chemical (i.e., dependent on specific properties of particular atomic structures) rather than physical.
URGENT - This is not really specific but I have a chemistry test really soon and I still don't understand how to balance chemical equations.. I've watched every video and tried practicing but I just still can't understand. Can someone help, please? 30 points will be given out + a brainliest answer will be picked
Answers
Answer:
Explanation:
- the key thing to note is that balancing is simply having equal amounts of all the compounds in an equation
1) look at how many there are in each compound i.e. cl2 has 2 and HCl has 1 hydrogen and 1 chlorine
2) balance the reactants with its products
this is done by adding a number in front of a compound
e.g. ch4 + cl2 = ccl4 + hcl
balanced: ch4 + 4cl2 = ccl4 + 4hcl
this is because there isnt equal elements of the compounds
A chemical equation is balanced if the number of each type of atom on the left side is equal to the number of each type on the right side. Is this reaction balanced?
(pls help me )
Answers
Answer:
nah its NOT
Explanation:
Answer:
yes a balanced chemical equation
it follows law of mass action that states mass can neither be created nor destroyed
The toucan uses its long beak to reach fruits and berries growing on trees in the forest. The energy stored in the fruit and berries is passed on to the toucan when it is eaten. What is the source of energy for the fruits and berries growing on the trees in the tropical forest?
A: Soil
B. Sunlight
C. Heat
D. Water
Answers
Answer:
The type of adaptations of the Toucan and Monstera Plant are physical adaptions. Both of these adapted physical characteristics help these organisms to survive. The difference in their physical adaptation is that in the Toucan, the physical characteristic helps the Toucan consume nutrients. Meanwhile, the adaptation of the Monstera Plant helps prevent harmful things such as mold.
Plants use photosynthesis to convert light into cellular energy, which allows them to make “food” out of the water and nutrients from the soil.
How to work out the relative mass of potassium? What is the calculation? ( explained very easily )
Answers
Answer:
39
Explanation:
Relative mass does not need to be calculated as it is listed on the periodic table. Potassium's relative atomic mass is around 39.
———————————
(1/12)th Mass of one C12 atom
A spinner divided into 8 equal sections labeled gray, green, red, purple, gray, green, yellow, blue.
He plans to spin it 80 times. Which equation predicts the number of times that he could spin green?
P (green) = StartFraction 1 over 8 EndFraction (80)
P (green) = StartFraction 2 over 8 EndFraction (80)
P (green) = StartFraction 3 over 8 EndFraction (80)
P (green) = one-half (80)
Answers
Answer:
C
Explanation:
Answer:
b
Explanation:
i took it on edge
Which set of coefficients will balance this chemical equation? HELP QUICKLY PLEASE
__C2H4 + __O2 → 2CO2 + 2H2O
A. 1, 2
B. 1, 3
C. 2, 3
D. 2, 5
I will gladly give a BRAINLIEST for a CORRECT, EXPLAINED answer!!
Answers
This would make 2 Carbons, 4 Hydrogens, and 4 Oxygens on each side of the equation
To know the number of atoms of an element in any compound or molecule we have to multiply the coefficients that is written in front of the molecule to the number that is written on the foot of that element. So the correct option is option B
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side
The number of carbon atoms on reactant side is 2 while on the product side it is 2
The number of Hydrogen atom on reactant side is 4 while on the product side it is also 4
The number of oxygen atom on reactant side is 1 while on the product side it is 6, so to balance oxygen we multiply O₂ by 3 so the balanced equation is
C₂H₄+3O₂\(\rightarrow\)2CO₂+2H₂O
Thus the balanced equation is C₂H₄+3O₂\(\rightarrow\)2CO₂+2H₂O. Option B is correct option
Learn more about the balanced equation, here:
https://brainly.com/question/7181548
#SPJ2
In an electrical wire, if instead of copper, plastic wire is used. Would it conduct electricity?Justify your answer.
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Answer:
No, a plastic wire would not conduct electricity. This is because plastic is an insulator that does not allow electric current to flow through it. In a wire, electrical conductivity is provided by the movement of charged particles - typically, electrons. Copper is an excellent conductor of electricity because it has a high number of free electrons that are not bound to atoms and can move through the wire very easily. However, in a plastic wire, the tightly bound electrons of its atoms do not allow for the free flow of charges, thus preventing the passage of electric current.
What is the difference between a meteor and a meteorite?
Answers
Answer:
meteorites are inside Earth's atmosphere on the ground
meteors are outside Earth's atmosphere
Explanation:
When meteoroids enter Earth's atmosphere (or that of another planet, like Mars) at high speed and burn up, the fireballs or “shooting stars” are called meteors. When a meteoroid survives a trip through the atmosphere and hits the ground, it's called a meteorite.
if a someone doesn’t understand mixtures of matter, how would you explain it to them?
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In chemistry, a mixture is a material made up of two or more different Chemical substance/substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
Explain what is meant by the phrase mass is conserved.’
Answers
Answer:
in a chemical reaction, the mass of the products will always be equal to the mass of the reactants.
Explanation:
which molecules from food and air end up in the cells in the body? choose all the apply- NEED URGENT 10 points!
Answers
Hope this detailed explanation helps!
Molecules from food and molecules of oxygen move from the mouth and the nose to cells of the body through a series of blood vessels, including veins, arteries, and microscopically small blood vessels (capillaries), that extend throughout the body.
write a short story using the characteristics of the subatomic particles and their locations in the atom. For example, you need a positive character, a neutral character, and a negative character. You need two different locations. One to be the center location of the story and the other to be outside the center. At a minimum you should have at least 1 paragraph with about 5 sentences. Make sure that you use complete sentences.
Make sure it is school appropriate!!
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To draw a Lewis structure for a polyatomic ion, begin by calculating A, the available electrons, and N, the needed electrons. What is N for CIO3-, the chlorate ion?
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Answer:
N for chlorate ion is one
Explanation:
Because N is the number of electrons needed to form octet structure causing a negative charge of one, since it already has 25valence electrons
Answer: 26
Correct Answer
PLSSSSSSSS HELP MEEEEEEEEEEEEEE
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Answer: The answer to your question is B,C,D.
Answer: i think A, B, D?
Explanation:
10g of water will freeze at "32c" what temperature would 20g of water freeze
Answers
Answer:
20g of water would freeze at the Same temperature
Every organism requires a set of instructions that specifies its traits. Which statement BEST describes the hereditary information in a cell?
pls help
A gene, but not DNA, is passed on to the next generation.
Each chromosome contains a single gene.
Genes are located on the chromosomes.
A gene, but not a chromosome, is made of DNA.
Answers
Answer:
the only option that is correct is the third
Explanation:
the second isn’t correct because they contain strands of thousands of genes. The first isn’t correct because they are both passed on. The last one isn’t correct because they are both made up of DNA
The surface of the land is shaped by the process of erosion and deposition caused by:
lava
water
wind
tsunamis
glaciers
waves
gravity
earthquakes
its a select that apply!
Answers
Answer:
Explanation:
hi
Explanation: Deposition occurs when the agents (wind or water) of erosion lay down sediment. Deposition changes the shape of the land. Water’s movement (both on land and underground) cause weathering and erosion, which change the land’a surface features and creates underground formations.
Does anyone know how to write a good hypothesis (If…then)
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pls help its timed: Which of the following elements has properties similar to Br? Refer to the section of the periodic table shown below:
Periodic table showing three rows. Row 1: boron (B), carbon (C), nitrogen (N), oxygen (P), fluorine (F), neon (Ne). Row 2: aluminum (Al), silicon (Si), phosphorus (P), sulfur (S), chlorine (cl), argon (Ar). Row 3: gallium (Ga), germanium (Ge), arsenic (As), selenium (Se), bromine (Br), krypton (Kr).
a
Argon (Ar)
b
Aluminum (Al)
c
Chlorine (Cl)
d
Carbon (C)
Answers
Answer:
I think its c
Explanation:
What happens to the atoms that make up hydrogen fuel as it burns?
Answers
Answer:
When hydrogen fuel burns, its atoms combine with oxygen atoms in the air, which creates a chemical reaction that releases energy in the form of heat and light. The hydrogen atoms lose their outermost electrons, becoming positively charged ions (protons). These ions combine with the oxygen atoms to form water molecules (H2O), which evaporate into the air as steam. Therefore, the atoms that make up hydrogen fuel ultimately become part of water molecules during the process of combustion.
Explanation:
How do we know what is inside the Earth? (How do we know the Earth has layers?)
(if you put a random answer for the points i will report)
Answers
How does an atom change if all of its electrons are removed?
p.s. I'll mark the first answer the brainliest if it is correct! ;)
a. The atom’s volume increases.
b. The atom’s mass increases.
c. The atom becomes positively charged.
d. The atom becomes negatively charged.
Answers
c. The atom becomes positively charged
if the electrons are removed it means theres no longer a negative charge to balance the positive charge of the protons in the atom
What is not an Example of the Coriolis effect?
Having trouble, not good at science!
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Answer:
the turn of the world, shooting a bullet in the air, airplane and
rockets, bouncing ball, ocean current, driving on curved road
Explanation:
there's no science in the pick a subject, so i chose chemistry. NEED HELP ASAP
Answers
Answer:Trade winds blowing in a curved manner
Explanation:Because i like the answer
Aiden has $100 in a savings account that earns 10% annually.The interest is not compounded. How much will he have in 1 year?
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Answer:
Explanation:
Sorry dunno
10/100 x $100 = $10
12 x 10 = $ 120
In humans, these organs are part of a larger system, the ________ system.
A.) Circulatory
B.) Reproductive
C.) Digestive
D.) Nervous
Answers
c) Digestive.
The stomach, pancreas, gall bladder are all present in the digestive system.
If you have questions ask anytime ;)