describe a physical change in which a substance appears to change chemically

Answers

Answer 1
Thanks for the question!

An example would be ice melting into water. It looks like it changes chemical composure, but it doesn't.

Hope this helps!

Related Questions

Based on the chemical bonds present in this molecule, we would classify it as a(n)

A) Simple Sugar

B) Saturated Fat

C) Unsaturated Fat

D) Complex Carbohydrate

Answers

The answer is C. Unsaturated Fat

Answer is C – Unsaturated fat.

Fats are large molecules basically made from a combination of glycerol and three chains of fatty acids. Usually fats consist of C, H and O. According to the C – C bond, there are two types of fats as saturated fats and unsaturated fats. Saturated fats have only C – C single bonds and all C atoms are sp³ hybridized atoms. But in unsaturated fats other than C – C single bonds there are C – C double bonds. Hence, both sp³ and sp² hybridized C atoms can be seen.


When sugar is mixed with water, equilibrium is reached when __________?

Answers

Sugar is mixed with wateer, equilibrium is reached in the dissolved sugar molecules are evenly distributed throughout the solution.

When sugar is mixed with water, equilibrium is reached when the rate of sugar dissolving in water equals the rate of sugar crystallizing or precipitating out of the solution.

This dynamic state of equilibrium is governed by the principles of solubility and saturation. Initially, when sugar is added to water, it dissolves as sugar molecules break apart and become surrounded by water molecules, forming a solution. As more sugar is added, the concentration of sugar in the solution increases until it reaches a point where no more sugar can be dissolved; this is called the saturation point.

At this stage, the rate of dissolution equals the rate of crystallization, resulting in a stable equilibrium where the concentration of dissolved sugar remains constant. The temperature and other factors can influence the equilibrium point, as changes in these conditions may shift the balance between dissolution and crystallization.

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Is ethyl alcohol a heterogeneous or homogeneous mixture?

Answers

Ethyl Alcohol is a pure substance making it a Homogeneous Mixture.

Hope this helps
Homogeneous Mixture. I just took a test on this :)

Is the dissolving of copper (ii) chloride in water a chemical change or a physical change why?

Answers

It would be a chemical change because the chloride water would have an effect on the copper. A way to tell if something is a chemical or physical change is that chemical change is not reversible. Physical change can be reversed. For example, water can be physically changed into ice, and it can go back into water. Hope this helps!

Why are the amounts of products formed in a reaction determined only by the amount of limiting reactant?

Answers

Final answer:

The amount of product formed in a reaction is determined by the limiting reactant.

Explanation:

The amount of product formed in a reaction is determined by the limiting reactant. The limiting reactant is the reactant that is completely consumed in a reaction, thus limiting the amount of product that can be formed. Let's say we have a reaction between hydrogen gas and oxygen gas to form water. If we have 4 moles of hydrogen and 2 moles of oxygen, the balanced chemical equation tells us that we need 2 moles of hydrogen for every 1 mole of oxygen. Since we have only 2 moles of oxygen, it will be completely consumed and we will only be able to form 4 moles of water, even though we have excess hydrogen.

The molar mass of iron oxide (Fe2O3) is 159.7 g/mol. What is the correct way to write the molar mass of iron oxide as a conversion factor?

Answers

the answer is C 159.7g Fe2O3/1 mol Fe2 O3

When writing the conversion factor for the molar mass of Fe2O3, it will be written as:

159.7 g Fe2O3 / 1 mol

What is the conversion factor of iron oxide (Fe2O3) whose molar mass is 159.7 g/mol?

The molar mass of a substance is the mass of one mole of that substance.

The molar mass of of iron oxide (Fe2O3) is 159.7 g/mol.

This means that 1 mole of iron oxide (Fe2O3) has a mass of 159.7 g.

Therefore, in writing the conversion factor, it will be written as:

159.7 g Fe2O3 / 1 mol

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The highest elevation Mt. Zembat in Alaska 40 years ago was measured at 7600 feet. Today the highest elevation is 7598 feet. What is the rate of change in elevation for this mountain?

Answers



It's simple:
rate of change = change in height / time period

= (7600 - 7598) / 40    =   2 / 40 =  0.05 feet / yr
Final answer:

The rate of change in elevation for Mount Zembat in Alaska is 0.05 feet per year, calculated by dividing the total change in elevation, 2 feet, over the 40-year period.

Explanation:

To calculate the rate of change in elevation for Mount Zembat in Alaska, we take the difference in elevation over the time period and divide it by the number of years. Forty years ago, the mountain was measured at 7600 feet, and today it is measured at 7598 feet. Therefore, the elevation has decreased by 2 feet over 40 years.

The rate of change per year is calculated as follows:

Rate of change = (Initial elevation - Current elevation) / Time

Rate of change = (7600 feet - 7598 feet) / 40 years

Rate of change = 2 feet / 40 years

Rate of change = 0.05 feet per year

So, the rate of change in elevation for Mount Zembat is 0.05 feet per year.

During photosynthesis, sunlight shining on a plant is absorbed. Through several chemical reactions, the plant produces sugar, a high-energy compound, from simpler substances. What energy transformation occurs during this process?

Answers

Answer: radiant energy to chemical energy

Explanation:-

Radiant energy is the energy of electromagnetic waves.

Chemical energy is the energy stored in the bonds of molecules.

Photosynthesis is a phenomenon in which green plants containing chlorophyll use sunlight as a source of energy to convert carbon dioxide and water to form glucose and oxygen.

Photosynthesis is the process used by plants, algae and certain bacteria to convert energy from sunlight called as radiant energy and turn it into chemical energy in the form of glucose which is used as a source of energy by many organisms.

[tex]6CO_2+6H_2O\overset{sunlight}\rightarrow C_6H_{12}O_6+6O_2[/tex]

Elements in the same group of the periodic table typically have ________.

Answers

similar characteristics

Water molecules are __________.
a. composed of atoms joined by stable polar covalent bonds
b. attracted to each other because of their polar nature
c. capable of interacting with ions and polar molecules because of water being a polar molecule
d. all of the above are true

Answers

D the reason is that they are all true

what is the mass of a 5.50 cm3 cylinder of a substance that has a density of 4.20 g/cm3

Answers

density  = mass / volume

4.20  = Mass / 5.50

Mass = 4.2 * 5.5 =   23.1 cm^3 Answer

a hockey player has the puck in the corner of the rink. an opposing player muscles him aside and emerges with the puck. this situation is most analogous to which kind of reaction?

Answers

Hm, probably single displacement.

Answer: Single displacement

Explanation:

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.

A general single displacement reaction can be represented as :

[tex]A+BC\rightarrow AC+B[/tex]

Thus if A is more reactive than b, then A can displace B from its position and can combine with C to give AC and B.

Given:A hockey player has the puck in the corner of the rink. An opposing player muscles him aside and emerges with the puck. Thus it is similar to single displacement reaction.

if an elements atomic mass is 70 and it has 39 neutrons how many protobs does it have? What element is this?

Answers

31 protons
Name: Gallium
Final answer:

The element has 31 protons based on the given information, but its specific identity cannot be determined.

Explanation:

The number of protons in an atom is determined by its atomic number. In this case, the element has 39 neutrons and a total atomic mass of 70. To find the number of protons, we subtract the number of neutrons from the atomic mass. So, the element has 31 protons.

The atomic number of an element determines its identity on the periodic table. However, with only the number of neutrons and the atomic mass given, it is impossible to determine the exact identity of the element. More information is needed to identify the element.

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The atomic nucleus does not contain ____________, which are negatively charged subatomic particles.

Answers

Only protons and neutrons are found in the nucleus of an atom. Electrons reside in orbitals surrounding the nucleus.

The atomic nucleus does not contain electrons, which are the negatively charged subatomic particles that orbit the nucleus. Protons and neutrons, carrying positive and no charge respectively, are the ones that make up the nucleus.

The atomic nucleus does not contain electrons, which are negatively charged subatomic particles. The nucleus is a positively charged region consisting of protons, which have a positive electric charge, and neutrons, which are neutral. Electrons are instead located outside the nucleus, moving through the mostly empty space that makes up the rest of the atom. These subatomic particles—protons, neutrons, and electrons—are bound by forces that define the structure of the atom. The arrangement of these particles explains why the nucleus itself carries a net positive charge, balanced by the negative charge of the electrons that orbit around it.

Although the nucleus of an atom is very important, it is the ___ of the atom that determine its chemical properties

Answers

Although the nucleus of an atom is very important, it is the electrons of the atom that determine its chemical properties.

Number of electrons of an atoms (the number of electrons in the outermost level mostly) determine the type of the element (whether it is a metal, metalloid or non-metal).
Based on this, the types of bonds that the atom can form (whether ionic or covalent) is determined, the type of reactions that the element can form is known and the elements that can react with it are also know.
Final answer:

It's the electrons of an atom that determine its chemical properties. Electrons participate in chemical reactions—and it's these electron interactions that govern the atom's chemistry. For instance, chlorine's reactions stem from its desire to gain an extra electron.

Explanation:

Although the nucleus of an atom is indeed very important, it is the electrons of the atom that ultimately determine its chemical properties. This is because electrons involve in the chemical reactions.

In order for any chemical reaction to occur, there must be a movement, exchange or sharing of the electrons between two or more atoms. It's these electron interactions that govern the chemistry of the atom, hence determining its chemical properties.

For example, chlorine (Cl) has 7 electrons in its outermost shell and would prefer to gain an additional electron to achieve a complete outer shell. This electron 'hunger' is what fuels chlorine's reactions with other elements and compounds, thus determining its chemical properties.

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What is the mass number of an ion with 109 electrons, 157 neutrons, and a +1 charge?

Answers

the mass number can be calculated using the following rule:
mass number = number of protons + number  of neutrons

we have the number of neutrons given as 157 neutrons
now for the protons, we know that in the neutral state, number of protons is equal to the number of electrons. Since this ion has a +1 charge, this means that the ion has one proton more than the number of electrons.
Therefore, number of protons = 109 + 1 = 110 protons

Substituting in the above equation, we can calculate the mass number:
mass number = 110 + 157 = 267

What is the correct name for the molecular compound n2s4?

Answers

dinitrogen tetrasulfide

The correct name for the molecular compound with chemical formula N₂S₄ is dinitrogen tetrasulfide.

What is chemical formula?

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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Determine the oxidation state of nitrogen in lino3.

Answers

Answer : The oxidation state of nitrogen in [tex]LiNO_3[/tex] is, (+5)

Explanation :

Rules for the oxidation numbers :

The oxidation number of a free element is always be zero. The oxidation number of a monatomic ion equal to the charge of the ion. The oxidation number of  Hydrogen (H)  is +1.The oxidation number of  oxygen (O)  in compounds is usually -2, but it is -1 in the peroxides. The oxidation number of a Group 1 element in a compound is +1. The oxidation number of a Group 2 element in a compound is +2. The oxidation number of a Group 17 element in a binary compound is -1. The sum of the oxidation numbers of all of the atoms in a neutral compound is zero. The sum of the oxidation numbers in a polyatomic ion is equal to the charge of the ion.

The given compound is, [tex]LiNO_3[/tex]

Let the oxidation state of 'N' be, 'x'

[tex](+1)+x+3(-2)=0\\\\x=+5[/tex]

Hence, the oxidation state of N is, (+5)

The oxidation state of N in [tex]{\text{LiN}}{{\text{O}}_3}[/tex]is [tex]\boxed{ + 5}[/tex]

Further Explanation:

Redox reaction:

It is a type of chemical reaction in which the oxidation states of atoms are changed. In this reaction, both reduction and oxidation are carried out at the same time. Such reactions are characterized by the transfer of electrons between the species involved in the reaction.

The process of gain of electrons or the decrease in the oxidation state of the atom is called reduction while that of loss of electrons or the increase in the oxidation number is known as oxidation. In redox reactions, one species lose electrons and the other species gain electrons. The species that lose electrons and itself gets oxidized is called as a reductant or reducing agent. The species that gains electrons and gets reduced is known as an oxidant or oxidizing agent. The presence of a redox pair or redox couple is a must for the redox reaction.

The general representation of a redox reaction is,

[tex]{\text{X}}+{\text{Y}}\to{{\text{X}}^+}+{{\text{Y}}^-}[/tex]

The oxidation half-reaction can be written as:

[tex]{\text{X}}\to{{\text{X}}^+}+{e^-}[/tex]

The reduction half-reaction can be written as:

[tex]{\text{Y}}+{e^-}\to{{\text{Y}}^-}[/tex]

Here, X is getting oxidized and its oxidation state changes from [tex]0[/tex]to +1 whereas B is getting reduced and its oxidation state changes from 0 to -1. Hence, X acts as the reducing agent whereas Y is an oxidizing agent.

Rules to calculate the oxidation states of elements:

1. The oxidation number of a free element is always zero.

2. The oxidation number of oxygen is generally taken as -2, except for peroxides.

3. The oxidation state of hydrogen is normally taken as +1.

4. The sum of oxidation numbers of all the elements present in a neutral compound is zero.

5. The oxidation numbers of group 1 and group 2 elements are +1 and +2 respectively.

The oxidation state of O is -2 and the oxidation state of Li is +1.

The expression to calculate the oxidation state in [tex]{\text{LiN}}{{\text{O}}_3}[/tex]is:

[tex]\left[ {1\left( {{\text{oxidation state of Li}}} \right) + 1\left( {{\text{oxidation state of N}}} \right) + 3\left( {{\text{oxidation state of O}}} \right)} \right] = 0[/tex]      …… (1)

Rearrange equation (1) for the oxidation state of N.

[tex]{\text{Oxidation state of N}} = \left[ { - 1\left( {{\text{oxidation state of Li}}} \right) - 3\left( {{\text{oxidation state of O}}} \right)} \right][/tex]          …… (2)  

Substitute -2 for the oxidation [tex]{\text{state}}[/tex] of O and +1 for the oxidation state of Li in equation (2).

[tex]\begin{aligned}{\text{Oxidation state}}\;{\text{of N}}&=\left[{-1\left({{\text{+1}}}\right)-3\left({-{\text{2}}}\right)}\right]\\&=\left[{-1+6}\right]\\&=+5\\\end{aligned}[/tex]

Therefore the oxidation state of N in [tex]{\mathbf{LiN}}{{\mathbf{O}}_{\mathbf{3}}}[/tex] is +5.

Learn more:

1. What is the oxidation state of phosphorus in [tex]{\text{PO}}_3^{3-}[/tex] ion? https://brainly.com/question/3059040

2. Determine the oxidation state of Cl in [tex]{\text{NaCl}}{{\text{O}}_{\text{3}}}[/tex]: https://brainly.com/question/1869644

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Redox reactions

Keywords: redox reaction, N, LiNO3, oxidation, reduction, reductant, oxidant, reducing agent, oxidizing agent, electrons, redox pair, redox couple, oxidation state, oxidized, reduced, simultaneously, +5, -2, +1, Li, O.

Select the compound that is not organic.
1. Sucrose
2. Methane
3. Urea
4. Sodium Chloride

Answers

It's sodium chloride

Answer:

Sodium chloride.

Explanation:

The organic compounds are compounds of carbon. They may have some other atoms like hydrogen, oxygen, sulfur, nitrogen, halogens etc. However the skeleton is of carbon only.

The simplest organic compound is methane (which is a hydrocarbon).

Sucrose is a disaccharide of glucose and fructose. It is an organic compound.

Urea is NH₂CONH₂, again an organic compound.

While Sodium chloride is NaCl, which has no carbon and it is an ionic inorganic compound.

Which compound is a carbohydrate?
A) sugar
B) water
C) olive oil
D) amino acid

Answers

The answer is a)sugar.
the answer is A.) sugar is a carbohydrate

(691)*(787100) rounded to the correct number of significant figures

Answers


691 * 787 100 = 543886100
: 543886100 or 5.438861e+8 (significant figures: 7, decimals: 0)

543,886,100



The visible part of the electromagnetic spectrum consists of the colors that we see in a rainbow. Different colors correspond to different wavelengths of light. Which color of visible light has the longest wavelength?A.Violet B.Red C.Green D.Yellow

Answers

the answer would be B red, violet would be the shortest

Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, red color of visible light has the longest wavelength. The correct option is option B.

What is electromagnetic wave?

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave, light wave.

There is a relation between frequency of wave, and wavelength of wave

Mathematically,

ν =c÷λ

where,

ν =frequency of light

c is speed of light

λ is the wavelength of light

Red color of visible light has the longest wavelength.

Therefore, red color of visible light has the longest wavelength. The correct option is option B.

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Prepare approximately .1n hcl by putting the correct amount of concentrated acid in a glass bottle and

Answers

Adding distilled water  to give a total volume of 1 liter.

Which of the following can be natural sources of water pollution?

a.
volcanic activity
b.
earthquakes
c.
algae blooms
d.
all of the above

Answers

The natural sources of water pollution are algae blooms. Therefore, option C is correct.

What is water pollution ?

Water contamination is the tainting of bodies of water, typically as a result of human activity, which has a detrimental impact on their uses. Aquifers, reservoirs, lakes, rivers, seas, and groundwater are all examples of bodies of water. When contaminants are introduced into these water bodies, water contamination results.

The main causes of water pollution are bacteria, viruses, parasites, insecticides, pharmaceuticals, plastics, feces, radioactive materials, fertilizers, and pesticides. These compounds are frequently invisible contaminants, since they do not always alter the color of the water.

The Industrial Revolution of the middle of the 19th century brought forth remarkable technological advancements, as well as new sources of air and water pollution. The repercussions of these developments started to be seen over the world by the middle of the 20th century.

Thus, option C is correct.

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Answer:

Algae Blooms

Explanation:

How is chemical sedimentary rock different from detrital sedimentary rock?

Answers

Detrital or clastic sedimentary rocks are composed ofrock fragments. They are different than chemical sedimentary rocks, which are composed of mineral crystals. Learn how these sedimentary rocks differ in their formation and composition.
Final answer:

Chemical sedimentary rock and detrital sedimentary rock differ in terms of their formation and composition.

Explanation:

Chemical sedimentary rock and detrital sedimentary rock are different in terms of how they form and their composition. Chemical sedimentary rocks are formed when dissolved minerals in water precipitate and solidify. Examples of chemical sedimentary rocks include limestone and rock salt. On the other hand, detrital sedimentary rocks are formed from the accumulation and lithification of fragments of other rocks. Examples of detrital sedimentary rocks include sandstone and shale.

Propane (C3H8), a fuel that is used in camp stoves, produces carbon dioxide (CO2) and water vapor (H2O) on combustion as follows. Mc032-1. Given that the molar mass of H2O is 18.02 g/mol, how many liters of propane are required at stp to produce 75g of H2O from this reaction

Answers

23L (A) is the correct answer :L

Answer : The volume of propane required are, 23.29 L

Solution : Given,

Mass of water = 75 g

Molar mass of water = 18 g/mole

First we have to calculate the moles of water.

[tex]\text{Moles of water}=\frac{\text{Mass of water}}{\text{Molar mass of water}}=\frac{75g}{18g/mole}=4.16moles[/tex]

Now we have to calculate the moles of propane.

The balanced chemical reaction will be,

[tex]C_3H_8+5O_2\rightarrow 4H_2O+3CO_2[/tex]

From the reaction, we conclude that

As, 4 moles of water produces from 1 mole of propane

So, 4.16 moles of water produces from [tex]\frac{4.16}{4}=1.04[/tex] mole of propane

Now we have to calculate the volume of propane.

As, 1 mole of propane contains 22.4 L volume of propane gas

So, 1.04 mole of propane contains [tex]22.4L\times 1.04=23.29L[/tex] volume of propane gas

Therefore, the volume of propane required are, 23.29 L

Why does a solid turn into a liquid when heat is added?

Answers

because the molecules in heat is hot and the molecules in the solid is tight together, and when the heated molecules, come in contact with the tight molecules, it makes the tight molecules become lose and they all become freely. I hope i this help 

Use the periodic table entry below to answer the following question.





What is the atomic mass of the element cobalt (Co)?


27
31
59
31.71

Answers

the answer is 59
the atomic mass is the number at the bottom so you've gotta round it to the nearest whole number

Which of the following will occur soon after a population of prey increases slightly in size?

A) Predator population will remain the same.
B) Predator population will decrease greatly.
C) Predator population will decrease slightly.
D) Predator population will increase greatly.
E) Predator population will increase slightly.

Answers

Your answer is D predator population will increase greatly. That's because if there's more prey there will be more food and its good for the predators to produce more because they don't got to worry about food. Speaking how they preys population grew.

So your answer is D.

Answer:

The Answer is E

Explanation:

Got it right on the test.

What is the relationship between mass and volume of a substance

Answers

the formula for density is m/v, d=m/v, usually when a object is larger the mass is more evenly displaced :)
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