Answer:
In the study of thermochemical processes, things are viewed from the point of view of the system. A chemical reaction or physical change is endothermic if heat is absorbed by the system from the surroundings. In the course of an endothermic process, the system gains heat from the surroundings and so the temperature of the surroundings decreases. The quantity of heat for a process is represented by the letter q . The sign of q for an endothermic process is positive because the system is gaining heat. A chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings is gaining heat from the system, the temperature of the surroundings increases. The sign of q for an exothermic process is negative because the system is losing heat.
Explanation:
Patrick can use the terms exothermic and endothermic to explain changes in thermal energy. Exothermic processes release heat into the environment, like burning wood, while endothermic processes absorb heat, like melting ice.
Explanation:Patrick can explain the change in thermal energy from one substance to another using endothermic and exothermic processes. An exothermic process is one in which heat is released into the surrounding environment. An example of this is the burning of wood in a fireplace where heat is given off as the wood burns, increasing the thermal energy in the room. On the other hand, an endothermic process is one in which heat is absorbed from the surroundings. An example is the melting of ice, which takes heat from the surrounding environment, reducing its thermal energy, to change from a solid to a liquid state. By using these terms, Patrick can effectively explain changes in thermal energy.
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Sulfur and Chlorine gas combine to form disulfurdichloride according to the following synthesis reaction:
S8 + 4Cl2 → 4S2Cl2
If we are given 100. g of Cl2 and 200. g of S8, what is the limiting reactant? What is the actual calculated mole ratio?
A) Cl2; 1.81:1
B) S8; 1.81:1
C) Cl2; 4:1
D) S8; 4:1
Answer:
A) Cl2; 1.81:1
How do scientist form hypothesis
Answer:
Explanation:
it needs to included an if,then statement.
5x-13 =12 write description that represents the equation
Answer:
x = 5
Because 12 + 13 = 5x
25 = 5x
x = 5
Answer:
5
Explanation:
Mary had 5 dollars she owe her friend Mia 13 dollars but she didn't have enough. so multiply how much she has to give to mia
I need help please!
Answer:
1. Dipoles
2. London Dispersion
3. weaker
4. long distances
5.easy
Explanation:
9) How many grams of carbon dioxide can be formed from the decomposition of 35.6
grams of calcium carbonate?
Answer: 15.7 g CO2
Explanation: Solution attached:
CaCO3 => CaO + CO2
Convert mass of CaCO3 to moles.
Use the mole ratio of CaCO3 and CO2 from the balanced equation.
Convert moles of CO2 to mass using its molar mass.
I NEED HELP
Write a mathematical equation showing that pressure (P) multiplied by volume (V) remains equal to a constant (k).
Explanation:
We have different gas laws that shows the relationship between pressure , volume , moles and temperature of a gas .
The gas laws that we generally study are :
Boyle's law Charle's Law Avogadro's Law Gay lussac's law and many more .Let us study about Boyle's Law :
According to it at constant temperature , the volume of a gas varies inversely with the pressure applied on a gas .
That is : P∞1/v
Or, PV=K (constant )
If we a gas whose volume is changed from V₁ to V₂ and Pressure is changed from P₁ to P₂then we have :
P₁V₁=P₂V₂
[tex]K = PV[/tex] is the mathematical relation between the pressure and volume of the gas when K is given.
What is the relation between pressure and volume of gas?At constant temperature, the volume (V)of an ideal gas is inversely proportional to the pressure(P) of the gas.
[tex]P = \dfrac 1V\\\\K = PV[/tex]
Where,
[tex]P[/tex]- the pressure of the gas
[tex]K[/tex] - gas constant
[tex]V[/tex] - the volume of gas
Therefore, [tex]K = PV[/tex] is the mathematical relation between the pressure and volume of the gas when K is given.
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Map of the United notes. Three circles centered at Portland, Salt Lake City, and Los Angeles. The circles converge at San Francisco.
Based on the seismograph measurements in the
Answer:
length tunes height over virtual distance
Answer:
san francisco
Explanation:
its correct i promise <3
When a turtle is lying on a sunny riverbank,how is it’s body temperature affected when it starts swimming in a cool river
Answer:
When a turtle is lying on a sunny riverbank, it’s body temperature rises and when it starts swimming in a cool river, it's body temperatures drop.
Explanation:
Cold-blooded animals, like turtles, do not have an internal feedback loop that regulates constant body temperature – as warm-blooded animals do. Their body temperatures fluctuate with that of the environment. This is why you see animals like lizards basking on rocks to raise their body temperatures. When it too hot, then they seek the shade under these rocks to lower their temperatures.
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PLEASE ANSWER
These two containers have a pink liquid in them. Which of these containers has more thermal energy and why?
A. Container B has more thermal energy because the temperature is higher.
B. Container A has more thermal energy since there is more room for the liquid to move around.
C. Even thought the temperature is the same,, container A has more thermal energy since it has less liquid than container B
D. Even thought the temperature is the same, container B has more thermal energy since it has more liquid than container A
D. Even though the temperature is the same, container B has more thermal energy, since it has more liquid than container A.
Explanation:
Whenever there is an increase in the volume of the pink liquid, it is due to the increase in temperature.
When the temperature increases, the molecules move farther apart as much as possible.
When the molecules moves apart from each other and collide with each other, so that its kinetic energy also increases, So thermal energy of the container B is more compared to the container A.
Final answer:
Container B has more thermal energy because it holds more liquid than container A, resulting in more total kinetic energy among its molecules, despite both containers having the same temperature.
Explanation:
The correct answer to the student's question is D. Even though the temperature is the same, container B has more thermal energy since it has more liquid than container A. Thermal energy depends on both the temperature of the liquid and the amount of substance that is present. In this case, despite having the same temperature, the larger volume of liquid in container B contains more molecules. Each molecule possesses a certain amount of kinetic energy due to its movement, so more molecules mean more total kinetic energy, which results in higher thermal energy. It's important to note that thermal energy is an extensive property; it depends on the amount of matter, so the more liquid there is (assuming everything else is constant), the more thermal energy there will be.
[Help] i am doing a crossword and it is a four letter word - _o_ _ the question is (scientist who developed the planetary model of the atom)
Neils Bohr
Development of the Atomic Theory. In 1913, Neils Bohr, a student of Rutherford 's, developed a new model of the atom. He proposed that electrons are arranged in concentric circular orbits around the nucleus. This model is patterned on the solar system and is known as the planetary model.
Answer: Neils Bohr
Explanation: In 1913, Neils was a student of Rutherford 's. He developed a new model of the atom. He explained that electrons are orignized in concentric circular orbits around the nucleus. This model is patterned on the solar system and is known as the planetary model.
go to abcte.org
After one half life, the ratio of parent atoms to daughter atoms in a sample is 1:2.
True or False
Answer:
FalseExplanation:
As we know that half life of any substance is constant. The ratio of parent to daughter atoms after one half life will be 1:1, then after the second half life further half of the first half will decay and will produce more daughter and reduce more parent and making the ratio 1:3, the ratio after 3rd half life will be 1:7, then 1:15 and so on.
Let's suppose that we are given with 100 g of radioactive substance and we are calculating the mass of parent and daughter atoms after every half life as;
1/2 life Mass of Parent Mass of Daughter Ratio
0 100 g 0 100:0
1 50 50 1:1
2 25 75 1:3
3 12.5 87.5 1:7
4 6.25 93.75 1:15
A cylinder at left with balls evenly spaced throughout the cylinder has an arrow leading to a cylinder at right cylinder with balls in a layer at its bottom. Which change of state is shown in the model?
Answer:
Condensation
Explanation:
Answer:
sublimation
Explanation:
it went from boiling so it can't be B. and its not condensation and i dont believe its freezing so C. is your answer
calculate the decrease in temperature (in Celsius) when 2.00L at 21.0*C is compressed to 1.00.
Decrease in temperature is -126.0°C
Explanation:
Using Charles law we can set up the equation as,
V₁/T₁ = V₂/T₂
(2.00 L) / 294.0 K) = (1.00 L) / (x)
cross multiply to get:
2x = 294
2x/2 = 294/2
x = 147.0 K
Now kelvin is converted into Celsius by subtracting 273 from 147 as,
147 - 273 = -126°C
Given that:
Volume,
[tex]V_1 = 2.00 \ L[/tex][tex]V_2 = 1.00 L[/tex]Temperature,
[tex]T_1 = 294.0 \ K[/tex][tex]T_2 = x[/tex]By using Charles Law, we get
→ [tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]
By substituting the values, we get
[tex]\frac{2.00}{294.0} = \frac{1.00 \ L}{x}[/tex]
[tex]2x = 294[/tex]
[tex]x = \frac{294}{2}[/tex]
[tex]= 147.0 \ K[/tex]
By converting "Kelvin" into "Celsius", we get
= [tex]147-273[/tex]
= [tex]- 126^{\circ} C[/tex]
Thus the response above is correct.
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Calculate the hydroxide ion concentration of a 0.200 M solution of HCIO4
The concentration of hydroxide ion is 5 [tex]\times[/tex] 10^ − 14 M.
Explanation:
Consider the equilibrium of this acid's dissociation,
H C l O 4 ⇌ H + + C l O 4 -
Moreover, let's assume that H C l O 4 is a strong acid and will fully dissociate.
Hence,
[ H + ] = 0.20 M
Now, recall,
K w = [ H + ] [ O H − ] = 1.0 [tex]\times[/tex] 10 ^− 14
Hence,
⇒ [ O H − ] = K w / [ H + ] = 5 [tex]\times[/tex] 10^ − 14 M.
Which of these outcomes is conclusive evidence that mixing sugar in water is a physical change?
A. There is no change in color.
B. There is no precipitate formed.
C. There is no gas given off.
D. There is no molecular chan
Answer:
a. there is no change in color
also when you mix sugar in water it dissolves which is a physical change :)
If you have 1.50 ton of poppy seeds and measure out 20.00 mg of seeds to determine that the average mass is 2.0 mg/ 19 seeds, how many seed are there in your 1.50 ton of poppy seeds? Use 454 g = 1.00 pounds
Answer:
18098
Explanation:
Which of the following is a pure substance made up of one type of atom?
A) bronze
B) lead
C) steel
D) brass
Answer:
B
Explanation:
The others are alloys and therefore do not appear on the periodic table
Lead is the correct answer as it is an element, which is a pure substance made up of one type of atom, unlike bronze, brass, and steel, which are alloys.
When asked which of the following is a pure substance made up of one type of atom, the correct answer is B) lead. An element is defined as a pure substance that cannot be broken down into simpler substances by chemical means and consists of one type of atom. Therefore, lead, which is an element, fits this description perfectly.
It's important to note that, unlike lead, bronze, brass, and steel are alloys, which are mixtures of two or more elements, with at least one being a metal. Bronze is an alloy of copper and tin, brass is an alloy of copper and zinc, and steel is an alloy typically made of iron and carbon. Each of these is not a pure substance because they contain more than one type of atom.
Use the words blank to fill in the missing words in the sentences.
igneous metamorphic magma graphite
a) When hot _________ cools, igneous rocks are formed.
b) When _________ is under higher pressure and heat, it becomes diamond.
c) _________ rocks include pumice and granite and can be formed above Eath's surface.
d) _________ rocks are formed when existing rocks are changed inside Earth.
When hot magma cools, igneous rocks are formed.
b) When graphite is under higher pressure and heat, it becomes diamond.
c) Igneous rocks include pumice and granite and can be formed above Eath's surface.
d) Metamorphic rocks are formed when existing rocks are changed inside Earth.
Explanation:Magma is the molten rocks that is found inside Earth’s surface. Its the lava that is stored inside the Earth’s surface. This magma formes out of the Earth's surface during a volcanic eruption, or cools inside the Earth's surface itself to form igneous rock.
Graphite and diamond both are the allotropes of carbon. This is the change in allotropes which can occur in extreme cases of temperatures or pressure which can occur inside the Earth’s surface. This can change graphite to diamond.
Igneous rocks which are externally formed are pumice or basalt which forms when lava comes out of Earth's interior and cools to form rock. Whereas the Igneous rocks like granite are formed when the magma cools inside the Earth’s surface due to cooling of lava.
Metamorphic rocks are formed when the Igneous or sedimentary rocks undergoes conditions of severe temperature or pressure from inside the Earth's surface and the structure of the rock fully changes. This is how the metamorphic rocks form.
Answer:
a) When hot Magma cools, igneous rocks are formed.
b) When Graphite is under higher pressure and heat, it becomes diamond.
c) Igneous rocks include pumice and granite and can be formed above Earth's surface.
d) Metamorphic rocks are formed when existing rocks are changed inside Earth.
Explanation:
Graphite is a form of carbon element,it gets converted in diamond when it is subjected to very high pressure (> 100 kbar) and temperatures ( > 2000°C).Igneous rock are formed when the hot magma cools and gets solidifies and they are Metamorphic rock is formed due to physical or chemical changes on a Pre-existing rock
Which factor is not a characteristic of a mineral?
A. crystalline structure that forms a geometric shape
B. always a solid; never a liquid or a gas
C. naturally occurring, inorganic substance
D. a variable chemical composition
A mineral is defined by its crystalline structure, solid state, naturally occurring and inorganic nature, and definite chemical composition. Therefore, 'a variable chemical composition' is not a characteristic of a mineral. The correct option is: D.
To determine which factor is not a characteristic of a mineral, we need to understand the key properties that define a mineral.
A mineral is characterized by the following:
Crystalline structure that forms a geometric shape: This indicates that the internal arrangement of atoms is orderly and repetitive.Always a solid; never a liquid or a gas: Minerals must be in the solid state at normal temperatures.Naturally occurring, inorganic substance: Minerals form naturally without any biological processes and are not composed of complex carbon molecules common in organic substances.A definite chemical composition: Minerals generally have a specific chemical formula, though some can have slight variations due to element substitution.Given this definition, the correct answer to the question is:
D. a variable chemical compositionMinerals have a definite chemical composition, which makes option D incorrect.
what is the number of neon for the periodic table
Answer:
it is 10
Explanation:
Answer:
10
Explanation:
calculate the molecular mass of Na2HPO4
Answer:
Molar mass of Na2HPO4=141.96, of Na2HPO4. 12H2O = 358.14: so to get the same 0.4 M: 28.65/358.14*141.96 g, add water until you reach 200ml , dissolve all solid and then filter to make sterile.
Explanation:
141g/mol is the molecular mass of Na[tex]_2[/tex]HPO[tex]_4[/tex]. It is also known as molecular weight. It is computed by multiplying the mass of every atom.
What is molecular mass?The quantity of mass associated with such a molecule is referred to as its molecular mass. It is also known as molecular weight. It is computed by multiplying the mass of every atom by the amount of atoms from the element in the molecule. Water, for example, is composed of two hydrogen atoms and one oxygen atom.
The total of the atomic weight of the atoms within a molecule yields the molecule's molecular mass. The molecular mass expresses the mass of such a molecule in relation to the mass of both the 12C atom, which itself is assumed to be 12.
Molecular mass = Molar mass of sodium×2+ molar mass of hydrogen + molar mass of phosphorus+ 4 molar mass of oxygen
Molecular mass = 23×2+1 + 30+ 4× 16=141g/mol
Therefore, 141g/mol is the molecular mass of Na[tex]_2[/tex]HPO[tex]_4[/tex].
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[A]a[B]b [C]c [D]d
When the Keq value is large, the number representing [A]a[B]b must be (larger or smaller) than the number representing [C]c[D]d. This relationship means that the (reactants or products) must be favored and that the mixture at equilibrium is largely (reactants or products).
Answer:
Smaller; products; products
Explanation:
aA + bB ⇌ cC + dD
[tex]K_{\text{eq}} = \dfrac{\text{[C]}^{c}\text{[D]}^{d}}{\text{[A]}^{a}\text{[B ]}^{b}}\\\\\text{When the $K_{\text{eq}}$ is large, the number representing [A]$^{a}$[B ]$^{b}$ must be $\textbf{smaller}$ than the}\\\text{number representing [C]$^{c}$[D]$^{d}$. This relationship means that the $\textbf{products}$ must be favoured}\\\text{and that the mixture at equilibrium is largely $\textbf{products}$.}[/tex]
2nd part of the other one plz help
18. Reaction will occur.
19. Reaction Will occur.
20. Reaction will occur.
21. Reaction will occur.
22. Reaction won't occur.
23. Reaction will occur.
24. Reaction will occur.
25. Reaction won't occur.
Explanation:The reaction rate of the metals with water, steam, acid, or hydroxides or their inert behavior towards them are noted in the metal activity series.
It contains all the metals one after the other which and the upper metal can replace the lower metal from its salt.
Calcium can replace hydrogen from acid, so the reaction will occur in 18. The products formed are calcium phosphate and hydrogen gas.
Chlorine is more reactive than bromine. So it can replace bromine from its salt to from bromine gas and magnesium chloride.
Aluminium can replace iron from its salt. So it will form aluminium oxide and iron metal. This reaction is used to obtain iron from ores.
Zinc can replace hydrogen from acid. So the products will be zinc chloride and hydrogen gas.
Chromium cannot displace hydrogen form water. So the reaction won't occur.
Tin can replace hydrogen form acid. So the reaction will proceed.
Magnesium will replace platinum from its salt. So magnesium oxide and platinum will form.
Bismuth cannot replace hydrogen from acid. So the reaction won't proceed.
which trait is most likely a result of artificial selection
Answer:
Explanation:Artificial selection is distinct from natural selection in that it describes selection applied by humans in order to produce genetic change. When artificial selection is imposed, the trait or traits being selected are known, whereas with natural selection they have to be inferred. In most circumstances and unless otherwise qualified, directional selection is applied, i.e., only high-scoring individuals are favored for a quantitative trait. Artificial selection is the basic method of genetic improvement programs for crop plants or livestock (see Selective Breeding). It is also used as a tool in the laboratory to investigate the genetic properties of a trait in a species or population, for example, the magnitude of genetic variance or heritability, the possible duration of and limits to selection, and the correlations among traits, including with fitness.
Wheat plants that produce much larger grains are most likely a result of artificial selection. Therefore, option C is correct.
What do you mean by artificial selection ?Artificial selection, also known as "selective breeding”, is where humans select for desired traits in agricultural products or animals, rather than leaving the species to germinate and alter gradually without human interference, like in natural selection.
Agriculture has traditionally utilised artificial selection to breed crops and animals with desired features. Today's meats are the result of carefully bred birds, cattle, sheep, and pigs.
By artificial selection, several fruits and vegetables have been enhanced or even invented.
Thus, Wheat plants that produce much larger grains are most likely a result of artificial selection, option C is correct.
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Your question is incomplete, most probably your question was
which trait is most likely a result of artificial selection?
A. Chickens, cattle, lambs, and pigs have been selectively bred to produce the available meats we eat today.
B. Artificial selection has enhanced or even developed several fruits and vegetables.
C. Wheat plants that produce much larger grains
D. all of the above
what mass of sodium chromate in grams is needed to produce
5.17
mol
of sodium nitrate?
The question is incomplete, complete question is :
For the following chemical reaction, what mass of sodium chromate in grams will be needed to produce 5.17 mol of sodium nitrate?
[tex]2AgNO_3 + Na_2CrO_4\rightarrow Ag_2CrO_4 + 2NaNO_3[/tex]
Answer:
418.77 grams of sodium chromate is needed to produce 5.17 mol es of sodium nitrate.
Explanation:
[tex]2AgNO_3 + Na_2CrO_4\rightarrow Ag_2CrO_4 + 2NaNO_3[/tex]
According to reaction, 2 moles of sodium nitarte is obtained from 1 mole of sodium chromate .
Then 5.17 moles of sodium nitarte will be obtained from :
[tex]\frac{1}{2}\times 5.17 mol=2.585 mol[/tex] of sodium chromate
Mass of sodium chromate :
[tex]2.585\times 162 g/mol=418.77 g[/tex]
418.77 grams of sodium chromate is needed to produce 5.17 mol es of sodium nitrate.
A major difference between a chemical reaction and a nuclear reaction is:
A) Anuclear reaction changes an atom's nucleus and chemical reaction loses/gains electrons.
B) A chemical reaction loses/gains electrons and a nuclear reaction loses/gains protons.
C) A nuclear reaction only uses elements and a chemical reaction only uses compounds.
D) A chemical reaction is exothermic and a nuclear reaction is endothermic.
Answer:
Explanation: is A
A major difference between a chemical reaction and a nuclear reaction is that a nuclear reaction changes an atom's nucleus and chemical reaction loses/gains electrons.
What are nuclear reactions?There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.
In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.
In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.
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In the process of cellular respiration,carbohydrate combines with _______ to produce carbon dioxide._________,and energy
The energy is generally not needed immediately, so it is used to combine ADP with phosphate ions to form ATP molecules. During the process of cellular respiration, carbon dioxide is given off as a waste product. This carbon dioxide can be used by photosynthesizing cells to form new carbohydrates.
Answer:
w
Explanation:
Chemical reactions are used to produce a variety of products, such as
Answer:
chlorinesoap and detergentscleansing agentssynthetic fabricsplastic (PVC, bakelite, polyethylene)stealgasolineExplanation:
Chemical reactions involve the transformation of substances, called reactants, by breaking some bonds and forming new bonds, to obtain different substances called the products.
In the chemical reactions the atoms of the reactants are rearranged giving rise to the products, which will contain the same atoms but bonded differently or even as separate elements.
Using chemical reactions the human being can, for example, produce chlorine from sodium chloride solutions (from the oceans). In the same reaction, caustic soda (sodium hydroxide, NaOH) and hydrogen gas (H₂), are produced as by-products.
The properties of the products of a chemical reaction are very different from those of the reactants: sodium chloride is consumed by the humans every day in almost every meal, while chlorine and caustic soda are lethal if human beings consume them in some way.
Some examples of the variety of products produced from chemical reactions include:
soap and detergentscleansing agentssynthetic fabricsplastic (PVC, bakelite, polyethylene)stealgasolineThe list could be huge, because most of the things that the human being use are manufactured using chemical reactions.
An elastic spring stores 45 [j] of elastic potential energy when it is stretched by 2cm. what is the spring constant ?
Answer:
225000
N/m
Explanation:
Final answer:
The spring constant is 5 N/cm.
Explanation:
The equation for elastic potential energy is given as:
U = 1/2kx^2
Where:
U is the elastic potential energy in joulesk is the spring constant in N/cmx is the displacement of the spring in cmIn this case, we are given that the elastic potential energy is 45 J and the displacement is 2 cm. Substituting these values into the equation, we get:
45 J = 1/2k(2 cm)^2
Simplifying, we find:
45 J = 2k cm^2
Solving for k, we divide both sides by 2(2 cm)^2:
k = 45 J / 2(2 cm)^2
k = 5 N/cm
Therefore, the spring constant is 5 N/cm.
Help please I need the answer
Answer:
Polyatomic Ionic Compound
Explanation:
In given statement the compound given is called as Sodium oleate this means that when Oleic acid is treated with NaOH then it forms.
In chemistry there are few species which are involved in the formation of compounds.
(i) Atoms:
It is very common that atoms of different elements combine to form compound through covalent bond. For example, H₂, O₂, N₂, F₂ e.t.c.
(i) Ions:
Other than covalent compounds we have ionic compounds. Ionic compounds are made up of ions. These ions forming the ionic compounds can be monatomic like Na⁺, Br⁻, Mg²⁺, Al³⁺, N⁻³ or they can be polyatomic like CO₃²⁻, SO₄²⁻, NH₄⁺, PO₄³⁻ e.t.c.
(iii) Polyatomic Ions:
In polyatomic ions we find a charge on a molecule which contains two or more atoms bonded covalently. Hence, in given compound we have a long chain of molecule containing a negative charge neutralized by opposite +ve charged sodium ion. Hence, Sodium oleate is a polyatomic ionic compound.