An astronaut is working outside a spaceship and realizes that the cord attaching him to the
spaceship has been broken. To move back to the spaceship in the vacuum condition, he
throws a heavy tool to the opposite direction from the spaceship. Which law of motion does
he apply?
Does he apply:
A. Newton’s Second Law of Motion
B. Law of Conservation of Energy
C. Newton’s Third Law of Motion
D. Newton’s First Law of Motion
Need helpASAP
An unbalanced chemical equation is shown:
2NaN3 → 2Na + N2
Which of the following statements explains why the equation is not balanced?
Four molecules of N2 should be produced during the decomposition.
Three molecules of N2 should be produced during the decomposition.
Four molecules of N2 should be produced during the synthesis reaction.
Three molecules of N2 should be produced during the synthesis reaction.
The correct statement is B. Three molecules of N₂ should be produced during the decomposition. :)
Answer: b
Explanation: I took the quiz
Describe the motion of particles in a substance as thermal energy is added
Answer: it moves faster
Explanation:
When heat is added it gains thermal energy therefore it moves faster as things heat up and it loses thermal energy when it gets cooler causing particles to move slower
A molecule composed of two or more different
kinds of atoms is a (an)
When a piece of sodium metal is kept in water in chemical equation
Explanation:
Sodium metal reacts rapidly with water to form a colourless basic solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The reaction continues even when the solution becomes basic. The resulting solution is basic because of the dissolved hydroxide.
Explanation:
Sodium metal reacts rapidly with water to form a colourless basic solution of sodium hydroxide (NaOH) and hydrogen gas (H2).
Sodium thiosulfate mixed with hydrochloric acid makes a green precipitate is this a physical or chemical change?
a. Physical
b. Chemical
Can someone help me answer this I will give you brainliest
Answer:
I don't know the answer you can search it on Google you will get it and don't forget to follow me and mark me as brainlest please I will follow u back really if u follow me back
Answer:
It is chemical Change
Explanation:
Because you are changing the substance.
In the burning food investigation where you are trying to find out which food contains the most energy - what is the independent variable? *
Answer:
sorry but i dont know it but you can ask me other things
NEED HELP ASAP 7th grade science btw pls
Answer: the answer is A or Tributaries, River system and rivers
Explanation: Its A i had the same question last year for my 10th grade assignment
Suppose someone claims they have invented a new automobile engine that can produce more energy than is found in the fuel used to run it. Apply scientific principles to evaluate the person's claim.
Answer:
See explanation
Explanation:
According to the second law of thermodynamics, the conversion of energy from one form to another is never hundred percent efficient. Some energy is always lost as energy is transformed from one form to another.
When a fuel is used to run an automobile engine, chemical energy from the fuel is converted into to the mechanical energy of the automobile. This energy conversion can never be hundred percent efficient in accordance with the laws of thermodynamics. Some energy is always lost as heat.
Hence, the engine does not even efficiently convert all the chemical energy available in the fuel. Therefore, it is impossible to find an automobile engine that can produce more energy than the fuel used to run it.
Which of the following is true with respect to energy in a closed system?
A.
Energy can be destroyed, but cannot be created.
.
Energy can be created, but cannot be destroyed.
B.
OOOO
C. The system's kinetic energy must equal its potential energy.
D.
The total amount of energy in the system always stays the same.
Answer:
D. The total amount of energy in the system always stays the same
Explanation:
In the closed system, the total amount of energy in the system always stays the same.
What is closed system?Closed system is a arrangement in which exchange of energy or any material is restricted.
If any reaction is carried out in a closed system then energy of the system may convert from internal energy to potential or from potential to kinetic energy. But the total energy of the closed system is always remain same as before and after the reaction.
Hence option (D) is correct.
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Centripetal acceleration is in a
describe the Rutherford model... and and what are its limitation...
going offline forever ✌️
Answer:
Limitations of Rutherford Atomic Model
Although the Rutherford atomic model was based on experimental observations it failed to explain certain things. Rutherford proposed that the electrons revolve around the nucleus in fixed paths called orbits. ... Ultimately the electrons would collapse in the nucleus.
Perform a DNA extraction from green peas at home or school lab, under adult supervision, by following the given procedure carefully.
Procedure for DNA extraction:
To half cup of split peas, add 1/8 teaspoon of salt and one cup of cold water.
Transfer this mixture in a blender and blend it on high speed for 15 seconds.
Filter the blended mixture, using a strainer, into a measuring container. Observe the amount of mixture you obtain after filtration. Add liquid detergent equal to 1/6 volume of the obtained pea mixture.
Mix by swirling. Allow the mixture to rest for about five to ten minutes.
Transfer this mixture to test tubes. Fill the tubes to about 1/3 of their volume.
Add a pinch of meat tenderizer to each of these tubes. Mix gently to avoid damaging the DNA.
Tilt the test tube, and pour alcohol (75% isopropyl alcohol or 95% ethanol) down the sides of the tube. Add alcohol to about 2/3 volume of the tube. You will obtain two layers. The layer at the top contains the DNA.
Now that you are done with the DNA extraction process, answer the following questions:
What purpose does blending the pea mixture serve?
Why do you need to add liquid detergent?
What role does the meat tenderizer play?
Why is alcohol added and why does the DNA get extracted in the alcohol layer?
Answer:
Blending is done to break open, or lyse, the cells.
DNA resides in the nucleus, which is enclosed by the nuclear membrane. The nucleus is further enclosed by the cell membrane. So, to get the DNA, we need to break open both the membranes. Cell membranes are made up of lipids and proteins. The detergent molecules to attach to the cell and nuclear membranes, causing them to break open.
Meat tenderizer contains the enzyme protease that helps cleave proteins. Even after breaking open the nucleus and cell membrane, the DNA is still protected by cell proteins. Meat tenderizer cleaves the proteins, leaving behind only the DNA molecule.
DNA is insoluble in alcohol and hence, when alcohol is added, it precipitates out the DNA.
Explanation:
PLATO Answer
27. The fundamental SI unit of length is the meter. How-
ever, we often deal with larger or smaller lengths or
distances for which multiples or fractions of the fun-
damental unit are more useful. For each of the fol-
lowing situations, suggest what fraction or multiple
of the meter might be the most appropriate mea-
surement.
a. the distance between Chicago and Saint Louis
b. the size of your bedroom
c. the dimensions of this textbook
d. the thickness of a hair
Answer:
A) Km
B) m
C) cm
D) mm
Explanation:
A) The distance between Chicago and Saint Louis is quite a distance and would be best presented in the largest multiple of the SI unit of length.
For example if the distance is 500000 m, it's a bit bogus to write, so we can simplify by writing in terms of 10^(-3) m which is in km.
Thus, we can write as 500000 × 10^(-3) km = 500 km
B) By standard measurement, the size of a bedroom is usually: 3.6 m × 3.6 m.
This not complex to write and can be kept as it is in metres.
C) The average dimension of a textbook is around 0.25 m by 0.2 m.
Let's get rid of the decimal by converting to terms of 10² m which is expressed as cm.
Thus, dimension is now: (0.25 × 10²) by (0.2 × 10²) = 25 cm by 20 cm
D) Average thickness of a hair in metres is 8 × 10^(-5) m.
Now this is a bit long. So we can express is in terms of 10^(3) m which is an expression denoted by millimeter (mm).
Thus, thickness is 8 × 10^(-5) × 10³ = 0.08 mm
A person is pushing a box with a mass of 25 kg. If it accelerates at 0.3 m/s2, what is the force being applied to the cart?
Answer:
The answer would be 80kg
Explanation:
Have a good day.
AS HEIGHT INCREASES SO DOES
Answer:
potential energy (im positive that its right)
Do S and Na have the same number of
electron shelis?
Answer:
Yes
Explanation:
Sulfur and Sodium will have the same number of electron shells.
Electronic configuration of
k l m
Na = 2 8 1
S = 2 8 6
We see that the have the same energy level.
Also, they belong to the same period on the periodic table. Elements in the same period will have equal number of shell.
Match the term with the example that shows its definition [please].
Compressibility
Flammability
Heat of combustion
Toxicity
A) The burning of coal releases heat
B) Gasoline catches fire
C) Gas is squeezed into a small container
D) High lead levels in a lake kill fish
What is the net force on a car stopped at a stop sign?
What type of clothing would you need to wear if you could visit the mesosphere
The type of clothe that you would wear when visiting the mesosphere are the winter clothes.
What is mesosphere?Mesosphere is used to describe the coldest part of the earth whose temperature is -85°C.
An individual that wants to visit such a cold area should wear clothes that would provide such with warmth such as the winter clothes.
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Arrange the elements in order of increasing ionization energy. Use the
periodic table to identify their positions on the table.
Drag each tile to the correct box.
Hola
Tiles
chlorine
fluorine
gallium
phosphorus
Sequence
Answer:
Gallium - Phosphorous - Fluorine - Chlorine
Explanation:
Answer:
Gallium < Phosphorus < Chlorine < Fluorine
Explanation:
<3
Analysis of a sample of an oxide of nitrogen gave 47% of nitrogen.What is the empirical formula of the oxide?
Answer:
N2O
Explanation:
hope am right.....
What is the temperature of a gas if the container has a volume of 2,300 mL, with a pressure of 932 mmHg and 3.51 moles?
Answer:
The preceding temperature is equivalent to approximately 9.6 K => -263.5 °C
Explanation:
Given the provided problem, the formula may be substituted by the corresponding values:
Pressure (P)= 932 mmHg ==> 1.2 atm
Volume (V) = 2,300 mL ==> 2.31 L
Moles (n) = 3.51 moles ==> 3.51 mol
Proportional constant of ideal gas constant: (R) = 0.08206
Therefore, we can equate the following:
T= (PV)
nR
T= (1.2 atm · 2.31 L)
(3.51 mol · 0.08206)
T= 9.6 K ==> -263.5 °C
Thus, the cumulative temperature given the substituents/substance is equivalent to -263.5 °C.
In your OWN WORDS, describe what the “Law of Conservation of Energy” is.
i need help people :0
Which of the following is not a subatomic particle?
O Electron
O Neutron
O Nucleus
O Proton
The nucleus is not a subatomic particle, but rather made of the subatomic particles of protons and neutrons. An electron is also a subatomic particle, but it is not found in the nucleus. There are many other subatomic particles, but your teacher probably won't go over those terms until later.
pls I need help give away 11 points
A particle has a nucleus that contains 10 protons and around the outside it has 8 electrons. What is the overall charge of the particle?
0
+2
-2
+18
Answer:
The charge is +2
Explanation:
Protons are positive, electrons are negative. 10-8=2.
+2 :)
A particle has a nucleus that contains 10 protons and around the outside it has 8 electrons, the overall charge of the particle is +2. Therefore, the correct option is option B.
What is atom?The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.
Space makes up the majority of an atom. The remainder is made up of a cloud of electrons with negative charges around a positive-charged nucleus made up of protons and neutrons. Compared to electrons, that are the lightest positive ions in nature, the nucleus is tiny and dense. A particle has a nucleus that contains 10 protons and around the outside it has 8 electrons, the overall charge of the particle is +2.
Therefore, the correct option is option B.
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What kind of reaction is 2H202
>
2H20 + O2?
Answer: Disproportionation reaction
Explanation: A reaction where a compound undergoes oxidation as well as reduction. 2H2O2=2H2O + O2 here hydrogen peroxide is oxidized to oxygen and is reduced to water.
Answer: B (Decomposition)
Explanation: A P E X X X
NEED HELP ASAP!!!!! PLEASE HELP!!!!! NEED HELP ASAP!!!!!
Directions: Name the covalent compound created.
EXAMPLE- Sr3P2= Tristrontium diphosphide
CH4 =
B2Si =
N2O5 =
CO2 =
Answer:
CH4 - Methane
B2Si - Diboron monosilicide
N2O5 - Dinitrogen pentoxide
CO2 - Carbon dioxide
Explanation:
When it comes to naming covalent compounds, there are several rules.
The name is derived based on the formula. For example, N2O5. The first element is nitrogen. To the name of the element, you add the prefix that tells us how many of its atoms are in the compound. In this case, there are two atoms, which means that the prefix will be di- (dinitrogen). The second element is oxygen. You are supposed to take only the root of the second element's name and then add the prefix denoting the number of its atoms and the suffix -ide (pentoxide). This is how we'll get dinitrogen pentoxide.
The only exception is methane (CH4), which is an organic compound. Organic compounds are named using the IUPAC nomenclature.
Name 3 sources of carbohydrates for the production of an alcoholic drink
Answer:An alcoholic drink is a drink that contains ethanol, a type of alcohol produced by fermentation of grains, fruits, or other sources of sugar. The consumption of alcohol plays an important social role in many cultures. Most countries have laws regulating the production, sale, and consumption of alcoholic beverages.
Explanation: vodka the preferred alcoholic beverage of choice among alcoholics? #3 Doesn't make you feel bloated or full like beer does. It goes down quickly and smooth. #4 Gets you drunk just as fast as any other hard liquor can, and obviously much faster than beer or wine.