It is difficult to classify dissolving as physical or chemical change because at some point dissolving produce new substance which can not be reversed while at some point no new substances are produced but and the process is reversed.
Physical change is a change in which no new substance is formed and the process is easily reversible. For example, the dissolution of salt in water is a physical change since we can reverse the process to obtain salt and water.
Water + Salt <=> Salt Solution
Chemical change is a change in which new substance is formed and and the process is not reversible. For example, the dissolution of metal in acid is a chemical change since we can not reverse the process to obtain the metal.
Acid + metal —> Salt + hydrogen gas
2Na + 2HCl —> 2NaCl + H₂
Thus, we can see that it is difficult to classify dissolving as a physical or a chemical change.
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There are three stable forms of neon: neon-20, neon-21, and neon-22. Which statement is true
- the atomic mass of the three isotopes is the same
-the three isotopes are all radioactive
-the three isotopes are equally abundant in nature
-the charge of all isotopes is the same
Answer:
The charge of all isotopes are the same.
Explanation:
Some isotopes are radioactive.
They have different numbers of neutrons resulting in different atomic mass.
Not all isotopes are equally abundant in nature.
Answer:
Then answer is the charge of all isotopes is the same
Explanation:
Describe hydrogen's atomic structure and its molecular structure.
Explanation:
A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force. Atomic hydrogen constitutes about 75% of the baryonic mass of the universe.
Names: hydrogen atom, H-1, protium, ¹H
Protons: 1
Neutrons: 0
Symbol: 1H
Answer:
The hydrogen atom has a nucleus consisting of a proton bearing one unit of positive electrical charge; an electron, bearing one unit of negative electrical charge, is also associated with this nucleus.
Explanation:
Which is larger?
1). 1 liter or 1500 milliliters
2) 12 cm or 12 milliliters
Answer:
1). 1 litre
2).12 cm
Explanation:
In 1 litre = 1000 ml whereas 1500 milliliters equals 0.15 litres and it is same for 12 cm and 12 milliliters
what is true about chemicals?
A. Chemicals are rarely found on earth
B. Chemicals are never dangerous
C. Chemicals are in many substances in a home
D. Things containing chemicals always cost a lot of money
hi <3
i believe the correct option would be C
hope this helps :)
Convert to standard notation.
9.3 x 10^-5
Answer:
9.3 x 10^ -5 in standard notation is 0.000093
Explanation:
Since 10 is raised to a -5, this means that there should be 5 zeros before the non-zero digits
MAY SOMEONE HELP ME PLZZ
A tire company wants to determine what kind of rubber will last the longest for their tires. What are some variables that the researchers will want to make controlled variables?
Answer: Rubber source, temperature, thinkness, thread design, driving pattenrs, weather, etc.
Explanation: There are many variables. Here are a few I would include in a tire lifetime study:
1. Type of rubber, including source
2. Thickness of tire
3. Design of tire thread
4. Life as a function of average speed and road surface
5. Expected outside temperature and wet conditions
6. Driving conditions of speed and both acceleration and deceleration parameters (e.g., tire life when slamming on the brakes or accelerating quickly)
PLEASE HELP ON EASY CHEMICAL PROPERTIES
Answer:
1, just I) color.
Explanation:
Physical properties are the properties that can be observed without changing the composition of a substance, such as color, temperature, density, and boiling point.
A physical change is a change in the substance that only modifies its aggregation state, such as solidification, and boiling.
Chemical properties are the properties that need a reaction to being observed, such as combustibility, which needs a combustion reaction to being quantified.
When a chemical reaction occurs, and the composition of the substance change, it's a chemical change.
So, heating copper with carbon is a chemical reaction, and purification by electrolysis is too. Color is the only physical property.
What should a prepositional phrase include after the preposition?
A.a noun and its modifiers
B.an adjective and an adverb
C.a subject and a predicate
D.an object and its modifiers
Answer:
B
Explanation:
A prepositional phrase should include after the preposition an object and its modifiers. The correct option is D.
What are prepositional phrases?A prepositional phrase is a group of words that contain a preposition with its object and the words that modify it. These are the words that change verbs and nouns.
For example, Mansi is going out with handsome Brian. Brian is the object and the beautiful is the prepositional phrase. The three types of prepositional phrases are:
Adverb prepositional phrases.Adjective prepositional phrases.Prepositional phrases, behave as nouns.If there are two prepositional phrases used in one sentence. The other prepositional phrase will be used as an adverb.
Thus, the correct option is D. an object and its modifiers.
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1. Based on the Law of Conservation of Mass, if
100g of sodium metal reacts with 25g of
chlorine gas, what will be the total mass of the
product, sodium chloride, created in the
chemical reaction?
2 Na Cl2
2NaCl
100gm + 25gm
+
?
[tex]\boxed{\sf {Na\atop Sodium}+{Cl\atop Chlorine}\longrightarrow {NaCl\atop Sodium Chloride}}[/tex]
Na=100gCl=25g.Mass of reactants :-[tex]\\ \sf\longmapsto Na+Cl[/tex]
[tex]\\ \sf\longmapsto 100+25[/tex]
[tex]\\ \sf\longmapsto 125g[/tex]
Mass of NaCl=125g
Drag the appropriate answer to the correct location on the concept map below.
Which statement describes a numerical result with good precision?
Answer:
poop
Explanation:
600mL of a gas at 27◦C and 1atm pressure is heated to 177◦C. What pressure Must be applied to the gas in order to maintain the same volume?
Answer:
gkfbhs DC hdshgagfzh
if you have observed something about the world and want to investigate it further, what are you seeking to do?
I'm seeking to ASK A QUESTION in accordance to the scientific method.
WHAT IS SCIENTIFIC METHOD:
Scientific method is the step by step procedure employed by scientists in order to investigate an occurrence or phenomenon in the world.The steps involved in the scientific method, which begins with making an observation, are as follows:
Make an observationAsk a question based on the observationFormulate a hypothesisTest the hypothesis via experimentationAnalyze result dataDraw conclusionAccording to this question, after observing something about the world and I want to investigate it further by asking a question as the next step.
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Would you categorize temperature as an Intensive or extensive property explain plz !!!
Extensive properties depend on the amount of matter in a sample, While Intensive properties do not depend on the amount of matter in a substance.
~Balancing oxidation-reduction reactions
Mg+ N2—>Mg3N2
Answer:
[tex]{ \sf{3Mg_{(s)} + N_{2(g)} →Mg _{3}N_{2(s)}}}[/tex]
H2O, OH
H2O, HCN
CN, OH
CN–, H2O
Answer:
The choose 2. H2O , HCN
I hope I helped you^_^
literally anyone pls
Answer:
0.5851 g/cm3
Explanation:
(45.62) ÷ (4.272)³ = 0.5851
What is the function of phloem tissue in the plant transport system?
A.it prepares food
B.it transports food
C.it transports water
D.it provides support
Answer:
option B is the right answer it helps in transfer of food.
what is combination reaction give two examples
Write a word equation for the chemical reaction.
I’ll brainlist.
Answer:
potassium hydroxide + sulfuric acid → potassium sulfate + water.
Explanation:
Hope it helps.. if yes, plz mark me as brainliest
What is the density of water (in g/mL) to fouf significant figures at 6°C?
Answer :
0.9999432 g/cm^3
The density of water in g/ml up to 4 significant figures at 6°C is 0.9999432 g/cm³.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant
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Cuales son los elementos (de la tabla periodica) que contienen los seres inertes (minerales)
Osea por ejemplo las piedras, el agua, la tierra, cuales son los elementos del universo que conforman cosas no-vivas?
How is the atomic mass of an element determined?
A. by adding the masses of the protons and electrons
B. by adding the masses of the neutrons and electrons
C. by determining the number of protons
D. by adding the masses of the protons, neutrons, and electrons
Answer:
D
Explanation:
Atomic mass is the total mass of protons, neutrons and electrons of an atom at rest
5. Which state(s) of matter |s/ar epsilon easily compressible? Select all that apply.
-liquid
-solid
-gas
-none
Answer:
Gas
Explanation:
The atoms, ions, or molecules that make up the gas are further apart and move freely at high speeds and is can easily be compressible.
Answer:
Gas
Explanation:
A gas is a substance or matter in a state in which it will expand freely to fill the whole of a container' having no shape like a solid and no fixed volume like a liquid.
what will happen to the atoms or sbstance when it is condenses
Answer:
Hey mate.....
Explanation:
This is ur answer.....
Condensation happens when molecules in a gas cool down. As the molecules lose heat, they lose energy and slow down. They move closer to other gas molecules. Finally these molecules collect together to form a liquid.
Hope it helps!
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The phenomenon where an electric current is produced by shining a light on a metal plate is called the ________ effect. The minimum frequency required to cause to flow is called the ________ frequency. This frequency depends on the identity of the metal used.
Answer:
Photoelectric, Threshold
Explanation:
Your welcome
Help me with this easy chemical change question!!!!
Answer:
1, just I) color.
Physical properties are the properties that can be observed without changing the composition of a substance, such as color, temperature, density, and boiling point.
A physical change is a change in the substance that only modifies its aggregation state, such as solidification, and boiling.
Chemical properties are the properties that need a reaction to being observed, such as combustibility, which needs a combustion reaction to being quantified.
When a chemical reaction occurs, and the composition of the substance change, it's a chemical change.
So, heating copper with carbon is a chemical reaction, and purification by electrolysis is too. Color is the only physical property.
The number of bonds in nitrogen molecule is:
Answer:
3 is the answer.
Explanation:
Nitrogen atoms will form three covalent bonds (also called triple covalent) between two atoms of nitrogen because each nitrogen atom needs three electrons to fill its outermost shell.
Answer:
3
Explanation:
What does a virus inject into a cell?
Answer:
The virus's genome is uncoated from the protein and injected into the host cell.
Explanation:
difference between Ammonia and ammonium..
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