Answer:
Atomic mass is the mass of an atom and is given in a.m.u. (atomic mass unit).
Explanation:
Atomic mass is the mass of an atom and is given in a.m.u. (atomic mass unit). However, a molar mass is the mass of one mole atoms or molecules and is given in grams. Sodium atom has a mass of 23 a.m.u. however, the molar mass of sodium is 23g/mol.
What is a change of a substance from one form to another without changing its composition called? (1 point) A. Atomic Change B. Chemical Change C. Molecular Change D. Physical Change
Answer:
D. Physical Change
What does one calorie do to water
Answer:
The calorie is a unit of energy widely used in nutrition. For historical reasons, two main definitions of calorie are in wide use. The small calorie or gram calorie (usually denoted cal) is the amount of heat energy needed to raise the temperature of one gram of water by one degree Celsius (or one kelvin). The large calorie, food calorie, or kilocalorie (Cal, calorie or kcal) is the amount of heat needed to cause the same increase in one kilogram of water. Thus, 1 kilocalorie (kcal) = 1000 calories (cal). By convention in food science, the large calorie is commonly called Calorie (with a capital C by some authors to distinguish from the smaller unit). In most countries, labels of industrialized food products are required to indicate the nutritional energy value in (kilo or large) calories per serving or per weight.
Explanation:
what type of mixtures can be seperated by using fractional distillation? Give any two examples
Answer:
liquid ethanol can be separated from a mixture of ethanol and water by fractional distillation and separation of various components of crude oil. This method works because the liquids in the mixture have different boiling points.
Explanation:
please give 5 star
The force that develops when two solutions, each with a different concentration of solutes, are separated by a semipermeable membrane is:________
a. systolic pressure
b. diastolic pressure
c. osmotic pressure
d. atmospheric pressure
Answer:
The correct answer is option c, that is, osmotic pressure.
Explanation:
The development of the force, which takes place when two solutions exhibiting distinct solute concentrations are distinguished by a semipermeable membrane is known as osmotic pressure. It is the least pressure that is required to be imparted to a solution to inhibit the inward pure solvent flow through a semipermeable membrane.
The flow of solvent molecules via a semipermeable membrane to a region of high solute concentration from a region of low solute concentration, until attainment of equilibrium, is done is termed as osmosis.
A solid object is 75.5 g in mass and has a volume of 13.25 cm^3. What is its density?
5,7 g/cm³
Explanation:d = m/V
= 75.5g/13.25cm³
≈ 5,7 g/cm³
The braking distance of the car represents which variable?
A-dependent
B-independent
C-control
Answer:
b
Explanation: i did the quiz
Answer:
Explanation:i’m not sure.
what is the Newton's second law?explain.
What is the effect of raising the temperature on the reaction rate? Using collision theory explains why this result was observed.
Answer:
An increase in temperature will result in increase in the average kinetic energy of the reacting particles(atoms). Which will therefore increase the frequency of their collision....
Using collision theory
The reaction rate increases......
Which of the following statements about the nucleus is false? A. Able to be lost or gained in chemical reactions. B. Made up of protons an neutrons. C. None of these D. Contains nearly all of the mass of the atom.
Answer:
A. Able to be lost or gained in chemical reactions.
Explanation:
Only electrons are lost or gained.
Able to be lost or gained in chemical reactions. Hence, option A is correct.
What are atoms?An atom contains a central nucleus surrounded by one or more electrons.
A chemical reaction is not created or destroyed, it simply moves electrons from one atom to another, and does not change the nucleus of the atoms. The total mass of the matter remains conserved in any chemical change.
Hence, option A is correct.
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What letter on the graph corresponds to only liquid water
Answer:
What letter on the graph corresponds to both liquid water and steam? D
Explanation:
Liquid water exists between 0 and IOO degrees Celcius.
Air has a mass of 1.2g and a volume of 4,555ml. What is the density
Answer:
Density = 0.00026 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]Density(\rho) = \frac{mass}{volume} [/tex]From the question
mass of air = 1.2 g
volume = 4,555 mL
Substitute the values into the above formula and solve for the density
That's
[tex]Density = \frac{1.2}{4555} [/tex]= 0.0002634
We have the final answer as
Density = 0.00026 g/mLHope this helps you
plastics are used to make electrical wires. Explain
Answer:
Plastic is a insulator that is why it is used
Explanation:
So wires or metal is a conductor and if you put a conductor as coating then it will conduct plastic coating is for protection because it does not conduct electricity or let it pass through that is why you don't get shocked but if coating was metal then it would conduct and you would get shocked.
Answer:
plastics don't conduct any electricity whatsoever, so plastic is actually used in a wide variety of applications where their insulating, or "protecting" properties are needed. PVC is the most common insulator for electric wiring, I know, because my dad's friend works in electrical and that's what he mainly uses in his line of work, but anyway. yeah, so, plastic materials such as PVC also helps with the prevention of electrical shock. obviously if you were to touch a bare electrical wire you would either be in for a long hospital stay or a coffin. lol um so yeah materials such as PVC are very good and are always used in electrical wiring to not only prevent electrical shock, but to also to provide an insulator and is good for use in high temperatures.
~hope i helped uwu n have a nice rest of ur day~
lots of love,
lee
I need help please help me
chemical potential energy, thermal energy, electrical energy, sound energy
Explanation:
the coal is chemical potential energy because it is just sitting there, the coal fueled power plant is thermal energy because it is using the heat from the coal to work the power plant, that is then turned into electrical energy, which then goes to the radio which displays sound energy
pls give brainliestFill in the SI unit for each of the following measurements. 1: Time: ___ 2. Length:___ 3. Mass:___ 4. Temperature___
the si unit for time is second
the si unir for length is meter
the si unit for mass is kilogram
the si unit for temperature is kelvin
1: Time: second 2. Length: meter 3. Mass: kilogram 4. Temperature kelvin are the SI units of measurements.
What do you mean by SI unit of measurements?
It is unit of the standard of reference which is chosen to measure any type of physical quantity.
SI Units of Measurements is the system which stands for the international system of unit.
The SI, uses standard symbols, units and abbreviations, developed by the Bureau International.
The SI unit of mass is the kilogram, length is a meter, time is second, temperature is kelvin, electric current is ampere, amount of substance is mole, luminous intensity is candela.
SI unit has a huge amount of application universally in both technical and scientific research to avoid the confusion.
This system is important as it helps the entire world to understand the measurements in one set of unit systems.
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Which of the following samples would be the most compressible?
C6H12O6 (s)
CO2 (g)
NaCl (aq)
H2O (l)
Answer:
CO2 (g)
Explanation:
In solids the interatomic or intermolecular space is least . It is most pronounced in gases . That is why inter molecular or interatomic attraction is least in gases . That is why gas flows .
Hence , when we try to compress a gas , due to inter molecular space , it is most likely to get compressed . It will be least compressed when we try to compress a solid because of lack of intermolecular space .
What evidence do you see that a chemical reaction is taking place when you add hydrogen peroxide to potassium ioxide??
Answer:
Bubbling/Foaming
Heat is produced
Explanation:
A chemical reaction has occurred if
1. There is a change in colour
2. Formation of a precipitate
3. Formation of a gas
4. Change in temperature
5. Change of smell
In the reaction of hydrogen peroxide and potassium iodide, the solution quickly rises which shows the formation of gas. This means it is a chemical reaction.
The beaker/test tube/whatever you used should also become warm because it is an exothermic reaction. This means its a chemical reaction
7)If a lab experiment is not completed, you should
O A discuss the jesue with your instructor.
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O B. sneak in after school and work alone.
O C. come in during lunch and finish while eating lunch.
O D. make up some results.
Answer:
A. discuss the issue with your instructor.
Explanation:
If a lab experiment is not completed then one should discuss it with their instructor because instructor guides how to perform the experiment and also gives instructions to avoid any mis-happening during experiment.
No one should perform any experiment without their instructor in school or college as it can be dangerous to experiment with chemicals or other experimental devices without any supervision.
Hence, the correct option is "A".
what simply states what will be observed and always true but does not explain why
Answer:
A Law
Explanation:
A scientific law talks about a law which has been observed and found to be always true but does not explain the reason behind it or the underlying causes which makes such an event to occur.
For example the law of conservation of energy states that energy can neither be created or destroyed, but can be converted from one form to another or transferred from one object to another.
In this law there is no reason why this happens and doesn’t state the causative factors.
Select the correct answer. Which quantity is a graduated cylinder designed for measuring? A. length B. mass C. temperature D. time E. volume
5) How many kilograms are in 185.6 lbs?
Answer:
84.1 Kilograms
Explanation:
What do you think plasma looks like on the molecular level?
Answer:
At the molecular level, the plasma only lets us see ions and electrons released.
Explanation:
Plasma is the fourth state of matter.
A state similar to gas, but with the difference that it does not have an electromagnetic equilibrium. It also has no defined mass or volume unless it is placed in a closed container.
Water in solid-state: A mesh style is seen where its components obtain more attraction force.
But on the other hand, in the plasma something well defined is not seen, since due to the high temperature its molecules give off electrons, leaving only ions and electrons around.
Why do you think the "super-hot" Earth's core is important in this
whole process? I need help! For science!!!:)
The "super-hot" earth's core is important because it generates the magnetic field around the earth. it also helps control evolution.
5.22x10-^3 = [? ]x 10-2
Answer:
5.22 x 10^-5
Explanation:
5.22 x 10^-3 x 10^-2 = 5.22 x 10^-5
Japanese scientists accidentally invented a way for ice cream to not melt by the power of polyphenols from strawberries. I want to know: Can eating too much ice cream that contains polyphenols kill you? Is it safe to eat too much?
Answer:
Japanese is educated place so they invent those things which are really good and helpful...
in my opinion it is safe....
Answer in the correct significant figures: 19.117 - 8.110
Answer:
11.007
Explanation:
that is the answer
Does covalency fail in explaining the formation of BeCl2 and PCl5? Explain
Answer:
Yes , covalency fails to explain the formation of BeCl₂ and PCl₅.
Explanation:
covalent bonds are formed between two atoms by sharing of outermost electrons in order to attain octet for attaining stability . To octet means to attain 8 electrons in their outermost orbit .
BeCl₂ :
Be has two electrons in its outermost orbit and each of Cl has 7 electrons .
Each of Cl shares one electron each with each of two electrons of Be . Cl atoms attain 8 electrons as octet . But Be attains only 4 electrons ( 2 of Be and 2 from Cl atoms ) . Hence octet of Be is not attained . So covalency fails in the formation of BeCl₂ .
PCl₅ :
P has 5 electrons in the outermost orbit . Each of these electrons shares with one electron from each of Cl atoms . Thus Cl attains octel state ( 8 electrons ) but P attains 10 electrons ( 5 + 5 ) , 5 of P and 5 from 5 Cl atoms .
Hence Octet of P is not attained . Hence covalency fails in the formation of PCl₅ .
A cation is a metallic ion derived from base.Why is it derived from base?Can you derive it from an acid?
Answer:the cation can't be drived from an acid
Explanation:
Example
HCL+MgOH2=MgCl2+H2O
The cation in the salt magnesium chloride is magnesium which is derived from the base and the anion chlorine from the acid hydrochloric acid. The same is true in water.
Please can you add as brainleist please!!!!!!!!!!!!!!!!!!!!
A weightlifter can lift 495 lbs. How many kg is that? Please provide a step-by-step procedure.
Answer:
Explanation:
2.2 pounds = 1 kg
495 pounds = x
2.2/495 = 1/x Cross multiply
2.2*x = 495 * 1 Divide by 2.2
2.2x/2.2 = 495/2.2
x = 225 kg
Express this number in scientific notation 50000
Answer:
We write 50,000 in scientific notation,
it is written as 5 x 10⁴.
Hope it helps.
Answer: 5×10^4
Explanation:
scientific notation: a×10^b, where should be 0<a<10
Step 1. Count the zeros
There are in total 4 zeros in 50000, so we write the exponent as 10^4
Step 2. Look at the number left
The number left is 5, which technically should be the [a] in the expression. But first, we need to check whether or not is it in the proper range of [a].
0<5<10, is it true? YES
So the final expression should be 5×10^4
Hope this helps!! :)
Please let me know if you have any question
state two things you notice about a metal when being touched
Answer: one thing you may notice when you touch metal is a small electric shock, and depending on the temperature, it could be hot, or cold.