Answer:
Mass is .5kg
Explanation:
F=ma, plug in your numbers:
F=4N
A=8m/s^2
4=m8
m=4/8
I need help with this one please it’s science
Answer: A change in appearance. (Please say thanks!)
Explanation:
The biggest sign of a chemical change is change in appearance.
Answer:
d
Explanation:
Which of the following accurately describes metallic bonding?
A. electrons sea of delocalized
B. electrons are shared between atoms
C. electrons are transferred between atoms
D. electrons are released as beta particles
The answer is not C that's all I know. Please answer with explanation if you know.
Answer:
A
Explanation:
Which of the following describes a species with the greatest fitness?
The species that can reproduce beter than the others
The species that is faster than the others
The species that is stronger than the others
The species that is larger than the others
Answer:
C is it!
Explanation:
1-Are natural resources renewable or nonrenewable?
2-what is the only way to stop the depletion of natural resources?
3-What is an example of poor soil management?
Answer:
1- Natural sources are renewable with time
2- To refrain from over usage of products on unnecessary things
3- An example of poor soil management is using the soil with the most minerals to put houses on instead of farming with
10. A gas sample that has a mass of 6g occupies 400 mL at 504°C and a pressure of 600 mm Hg. Calculate the gas’s density at STP.
Answer:
51 g/mol
Explanation:
Whenever you see molar masses in gas law questions, more often than not density will be involved. This question is no different. To solve this, however, we will first need to play with the combined ideal gas equation PV=nRT to make it work for density and molar mass. The derivation is simple but for the sake of time and space, I will skip it. Hence, just take my word for it that you will end up with the equation:
Who knows the answer to this please help
n which phase(s) of matter are the atoms closely packed but still able to slide past each other?
gas
liquid
solid and gas
liquid and solid
Answer:
I belive its liquid if I'm right because liquids are packed together when they take shape but they are still able to move.....brainliest???
Answer:
Liquid
Explanation:
Please don't jugde me if I got it wrong
.Which statement about transition elements is correct?A Their soluble salts usually form coloured aqueous solutions. B They are all in the same group of the Periodic Table. C They are non-metals with high melting points. D They can be mixed together to form compounds
Answer:
A Their soluble salts usually form coloured aqueous solutions
What might happen if you mixed a strong acid with an equally strong base?
A.You would see an explosive chemical reaction.
B.The acid would destroy the base.
C.The base would destroy the acid.
D.You'd wind up with a pH-neutral salt and water.
Answer:
D
Explanation:
When you mix a strong acid and a strong base : ( D ) You will wind up with a pH-neutral salt and water
The mixture of a strong base and an equally strong acid results in a neutralization reaction, because at the point of equivalence the base and acid will completely neutralize each other.
The mixture solution will have a pH value of 7 and the end products will an ionic salt and water.
Hence we can conclude that When you mix a strong acid and a strong base , you will wind up with a pH-neutral salt and water.
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4) How does an atom have a charge of -3?
Answer:
When the electrons hit the atoms in the chamber, they cause some of the electrons in the atoms to be stripped or knocked away. ... When one or more electrons is knocked off of an atom, it becomes positively charged. It is now an positive ion. A negative ion can be made by adding an electron to an atom.
Explanation:
How do the products of chemical reactions compare to their reactants?
Question 5 options:
The products often have completely different properties than the reactants.
The products usually weigh more than the reactants.
The products usually have more atoms than the reactants.
The products are usually more toxic than the reactants.
Answer: The products usually weigh more than the reactants.
Explanation:
Answer:
A
Explanation:
i just took the k12 test
Some things that can be made from coal are...
A. All of the above
B. Tar
C. Generating power
D. Plastics
E. Fertilizer
Answer:A
Explanation:just casuse
Jeremiah pushed Anthony with a net force of 12 N. Anthony accelerated across the hall at 0.2 m/s2. What was Anthony’s mass?
Answer:
6
Explanation:
Work Shown:
Force = Mass*Acceleration
F = ma
12 = m*0.2
12/0.2 = m
60 = m
m = 60 kilograms
Negative ions have ______ (More or Less) protons than electrons.
Answer:
Less
Explanation: I took the test.
Answer: negative ions have less protons than electrons.
Explanation:
What is the cost to drive to Los Angeles from San Francisco a distance of 405 miles if the cost of gasoline is $2.90 a gallon and the car get 25 miles per gallon of gas?
Answer: $46.98
Explanation:
The distance to drive to Los Angeles from San Francisco is 405 miles. Since the car get 25 miles per gallon of gas, for 405 miles, the car will use:
= 405/25 = 16.2 gallons
Since the cost of gasoline is $2.90 a gallon and the car will use 16.2 gallons. The cost will be:
= $2.90 × 16.2 gallons
= $46.98
What is the density of an object (g/cm) that has a mass of 2.78 g & a volume of 10.0
cm3?
Answer:
The answer is 0.28 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{2.78}{10} \\ = 0.278[/tex]
We have the final answer as
0.28 g/cm³Hope this helps you
Answer:
p = 0.278 g/cm3
Explanation:
1.) What is the molecular weight of the ketone shown below?
2.)Dry ice sublimes at −78.5 oC at a pressure of 1 atm. At room temperature and 1 atm pressure, what is happening to the dry ice molecules on a molecular level as sublimation occurs?
3.)For the pairs of molecules given below, list the intermolecular forces in each molecule. Also, give the types of electrostatic interactions that could occur between each pair of molecules
cyclohexane and CH2Cl2
CH3CH2OCH2CH3 and CH3CN
Answer:
See explanation
Explanation:
1. The Ketone was not sown in the question but i can give you a general idea of how to calculate its molecular weight. A ketone has a general molecular formula of CnH₂nO.
The molecular weight is calculated knowing that the relative atomic mass of carbon is 12, that of hydrogen is 1 while that of oxygen is 16.
Hence from the general molecular formula, the molecular weight of any ketone is calculated from; n(12) + 2n(1) + 16. Where n represents the number of atoms of each element in the ketone.
2. Sublimation of dry ice occurs when the molecules in dry ice absorb sufficient energy in the form of heat such that they now have enough energy for some molecules to overcome the inter molecular forces acting in the solid crystal and transform directly into the vapor phase. This process is endothermic.
3.
cyclohexane and CH2Cl2 molecules are held together by dispersion forces.
CH3CH2OCH2CH3 and CH3CN are polar molecules held together by dipole-dipole forces.
Lucy learns that the lymphatic system is part of the circulatory system. She wants to learn more about it and reads more carefully about the part it plays in circulation. What is the role of lymph nodes in the lymphatic system?
A. They are found in the plasma and help fight off bacteria and other harmful microorganisms.
B. They filter plasma and return it back to the bloodstream.
C. They filter lymph by trapping harmful bacteria and other microorganisms in the fluid.
D. They transport lymph to where it is needed in the body.
Answer: C because I’m smart
Explanation:
The Lymph nodes have been consisted of the lymph fluid that has been able to entrap the bacteria and kill them. Thus, option C is correct.
Lymph nodes have been defined as the small swellings in the lymphatic system that has been consisting of the various parts of the body.
The lymph nodes have consisted in the neck, armpit, chest and abdominal region of the body and have been able to perform the function as the first layer of defense.
The Lymph nodes have been consisted of the lymph fluid that has been able to entrap the bacteria and kill them. Thus, option C is correct.
For more information about the lymph nodes, refer to the link:
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Atoms that gain
an electrons
have a _____
Charge?
Answer:
positive
Explanation:
The half-life of carbon-14 is about ____________ years.
Fill in the blank.
Answer:
5730 years
Explanation: for more on radiocarbon dating.) and hence explain why the amount of carbon-14 in the sample decays by half over any period of 5730 years.
calculate the number of moles
for 66 gram of CO2
Answer:
1.55
Explanation:
The number of moles = given mass / molar mass
The given mass is 66 g and the molar mass is 44 g/molar mass
Substituting the values in, we get that:
the number of moles = 66/44
the number of moles = 1.55
hope this helped!
training doctors to recognize child abuse and explain how you could apply it to teaching. Write a short paragraph, using complete sentences with proper grammar, spelling, and punctuation.
Answer: E
Explanation:
Everyone has a laughing place, The trouble is most people don't take the time to look for it.
true
or
false
Answer:
True
Explanation:
Answer:
True
Explanation:
Most people stick to what they know and don't look for a laughing place.
Please help me I don’t understand this !!!
Answer:
The real answer for a is-He(helium)4,002602
The answer for b is-Mg(Magnesium) 24.305
What has modern media shown you about atoms
Janet is sliding a box across the floor what does she need to know to calculate the force on a box?
Answer:
She needs to know the Mass and acceleration
Janet needs to know the mass of the box and acceleration .
What is force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
Learn more about force ,here:
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what is electron shielding?
Answer:
Electron shielding is when the inner electrons shield the outer electrons from the full force of the nucleus
How many moles are present in 2.3 x 1023 molecules of NH3?
Answer:
0.38 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{2.3 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{2.3}{6.02} \\ = 0.382059...[/tex]
We have the final answer as
0.38 molesHope this helps you
points)
(06.01 LC)
Based on the kinetic theory, which statement is true? (4 points)
A
Matter consists of only large molecules.
B
Matter is made up of only charged particles.
C
The particles of matter have zero kinetic energy and potential energy.
D
The particles of matter are arranged in different ways for the different state.
Answer:
D .The particles of matter are arranged in different ways for the different state.
Explanation:
The kinetic molecular theory is used to explain the forces between molecules and the energy the molecules possesses.
One of the key postulate of this theory is that;
The particles of molecules are continual state of motion. They posses kinetic energy. In gas, the particles are random and moves in a straight line motion. Liquids are less random and only slide past one another. Solids have a restricted space and the molecules are free to move about.Therefore, we can see that the particles of matter are arranged in different ways for different state.
Which is the last section of the digestive system?
small intestine
liver
large intestine
rectum
The last section of the digestive system is the rectum.
What is digestive system?Digestive system is the system of the body that comprises of organs,enzymes that help to break down large molecules of food into smaller mole yles which is easily absorbed by the body.
Therefore, The last section of the digestive system is the rectum.
Learn more about digestive system below.
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Answer:
r3ctum
Explanation:
for people on edge.
