Answer:
a
Explanation:
An item which is experiencing a phase change is water boiling in a tea kettle.
What is a phase change?The conversion of matter from one state to another is called as phase change.The process is accompanied by a large amount of energy being evolved or absorbed during the process. It also depends on factors like temperature and pressure.
Each form of matter has it's own characteristic properties like specific heat, melting and boiling points . There are eight thermal processes through which matter undergoes phase change. They are as follows:1) freezing 2) melting 3)vaporization 4)condensation 5)sublimation 6)deposition 7)ionization 8) recombination.
These eight phases exist at different temperatures and pressures.The heat transfer process takes place in three ways which are conduction, convection and radiation.
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Fe + Cl2 → FeCl3, what coefficients would balance the equation?
3,2,2
1,1,1
2,3,2
4,2,2
The coefficients that will balance the equation will be 2,3,2.
Balancing chemical equationFor a balanced equation, the number of atoms of each element on the reactant side must be equal to those of the product side.
Thus, the balanced equation of the reaction will be:
2Fe + 3Cl2 → 2FeCl3
Consequently, the coefficients of the balanced equation are 2,3,2.
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Which statement is true about the exothermic reaction?
A.) The enthalpy of the products is greater than that of the reactants.
B.) The enthalpies of the reactants and the products are equal.
C.) The enthalpy of the reactants is greater than that of the products.
Answer:
C
Explanation:
The enthalpy of the reactants is greater than that of the products.
The statement is true about the exothermic reaction is the enthalpy of the reactants is greater than that of the products. Therefore, option C is correct.
What is an exothermic reaction ?A chemical reaction involves the movement of energy to or from the environment. An exothermic reaction occurs when energy is transmitted to the environment, raising the ambient temperature. Combustion reactions are an example of an exothermic reaction.
Chemical processes known as exothermic reactions generate heat. Therefore, the H of reaction is negative for exothermic processes. Heat is released during an exothermic reaction, raising the temperature of the immediate environment. The environment is cooled through an endothermic process that absorbs heat.
Heat is released during an exothermic reaction, raising the temperature of the immediate environment. The environment is cooled through an endothermic process that absorbs heat.
Thus, option C is correct.
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What happens to temperature as a substance melts and heat energy is used to break the connections between molecules, until all melting is complete?.
What happens to temperature as a substance melts and heat energy is used to break the connections between molecules, until all melting is complete?.
Answer : Stays the same
hello people ~
Petrochemicals are
A. mixtures of petrol and chemical fertilizer.
B. materials obtained from petroleum refining.
C. mixtures of coal and petrol.
D. mixtures of wood and chemicals
Materials obtained from petroleum refining
Answer:
Petrochemicals are mixtures of petroleum and natural gasThey ae mined undergroundExamples are Petrol,diesel ,etc
An old iron battery was discarded in this meadow. The iron in the battery is undergoing a ____ change as it rusts. The rusting is changing the battery's color from black to orange. A) physical B) chemical C) environmental D) none of these changes are occurring
Answer:
chemical
Explanation:
A chemical change is irreversible and leads to the formation of new products.
Rusting occurs as a result of an irreversible chemical reaction between iron, oxygen and moisture. Rusting is the oxidation of iron when exposed to oxygen and moisture.
The rusting of iron is an electrochemical process in which water serves as the electrolyte and iron serves as the anode. The rusting of iron leads to the formation of hydrated iron III oxide (rust) usually seen an brown flakes that surround a rusted iron material.
Individual cells do not need to maintain homeostasis.truefalse
Answer:
The answer is
→ False.
Explanation:
Without homeostasis, cells can't build up body systems which require homeostasis. Without homeostasis, body systems can't be created and life on Earth would be impossible without homeostasis.
a particular radio station broadcasts radio waves at 100 MHz (100 million Hz). if radio waves travel at the speed of light (300 million m/s), then what is the wavelength of the radio waves that the station broadcasts.
Wavelength = (speed) / (frequency)
= (3 x 10⁸ m/s) / (1 x 10⁸ /s) = 3 meters
The chemical equation below shows the reaction between carbon dioxide (CO2) and lithium hydroxide (LiOH). CO2 2LiOH Right arrow. Li2CO3 H2O The molar mass CO2 is 44. 01 g/mol. How many moles of LiOH are needed to react completely with 25. 5 g of CO2? 0. 290 moles 0. 579 moles 1. 16 moles 1. 73 moles.
Answer:
C
Explanation:
The reaction between carbon dioxide and lithium hydroxide can be represented by the equation:
[tex]\displaystyle \text{CO$_2$} + 2\text{LiOH} \longrightarrow \text{Li$_2$CO$_3$}+ \text{H$_2$O}[/tex]
We want to determine the amount of moles of LiOH needed to react completely with 25.5 g of CO₂.
Determine the number of moles of CO₂ in 25.5 g of CO₂:
[tex]\displaystyle 25.5\text{ g CO$_2$} \cdot \frac{1\text{ mol CO$_2$}}{44.01\text{ g CO$_2$}} = 0.579\text{ mol CO$_2$}[/tex]
Use stoichiometry to determine the amount of LiOH necessary. CO₂ and LiOH are in a 1:2 ratio. That is, for every one mole of CO₂ that reacts, two moles of LiOH must also react.
[tex]\displaystyle 0.579\text{ mol CO$_2$} \cdot \frac{2\text{ mol LiOH}}{1\text{ mol CO$_2$}} = 1.16\text{ mol LiOH}[/tex]
In conclusion, our answer is C.
May someone Please help me with this science question!
Love:
C A I L Y N N
What is the main difference between Lewis structure and Bohr models?
The main difference between both models is that the Bohr model depicts all subatomic particles, but the Lewis dot diagram only depicts the symbol and valence electrons.
What is Lewis structure?Lewis Structure is a simplified representation of a molecule's valence shell electrons. It's used to depict how electrons in a molecule are distributed around specific atoms.
Electrons are shown as "dots" or as a line between two atoms when they are bonded in Lewis structure.The Bohr Model is a planetary model in which negatively charged electrons orbit a tiny, positively charged nucleus in the same way that planets orbit the sun.Hence the Bohr model depicts all subatomic particles, but the Lewis dot diagram only depicts the symbol and valence electrons.
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What is the volume of 1 mole of gas at Standard Temperature and Pressure (STP)?
Explanation:
[tex]22.4 lit[/tex]
a mass of 0.15 ounces is equal to how many grams if 1 oz = 28.35 grams?
Answer:4 1/2 grams.
Explanation: 0.15 is equal to 4 1/2 grams because if you convert ounces into grams 0.15 is equal to 28.35. hope this helped bro.
How is temperature related to the physical change of a
substance?
Answer:
Physical conditions like temperature and pressure affect state of matter. ... When thermal energy is added to a substance, its temperature increases, which can change its state from solid to liquid (melting), liquid to gas (vaporization), or solid to gas (sublimation)
Answer:
Temperature is a measure of the kinetic energy of particles in a substance. As temperature increases, the atoms or molecules in a substance gain energy. As temperature decreases, the particles lose energy. A change in the energy of particles causes a change in their arrangement. A change in the arrangement of particles can lead to a physical change.
Explanation:
on edge 2021
17. True or False: Proximal means farther away from the point of attachment of the limb. *
(1 Point)
True
False
Which statement describes a difference between transcription in eukaryotic and prokaryotic cells?
In eukaryotes, transcription occurs simultaneously with translation, while transcription in prokaryotes must complete before translation can begin..
In eukaryotes, transcription produces a monocistronic RNA, while transcription in prokaryotes produces a polycistronic RNA.
In eukaryotes, transcription produces an RNA molecule, while transcription in prokaryotes produces a DNA molecule.
In eukaryotes, transcription produces an DNA molecule, while transcription in prokaryotes produces a RNA molecule.
In eukaryotes, transcription is completed by an RNA polymerase, while transcription in prokaryotes is completed with a DNA polymerase.
Answer:
Which statement describes a difference between transcription in eukaryotic and prokaryotic cells?
In eukaryotes, transcription occurs simultaneously with translation, while transcription in prokaryotes must complete before translation can begin..
In eukaryotes, transcription produces a monocistronic RNA, while transcription in prokaryotes produces a polycistronic RNA.
In eukaryotes, transcription produces an RNA molecule, while transcription in prokaryotes produces a DNA molecule.
In eukaryotes, transcription produces an DNA molecule, while transcription in prokaryotes produces a RNA molecule.
In eukaryotes, transcription is completed by an RNA polymerase, while transcription in prokaryotes is completed with a DNA polymerase.
Can somebody try and answer 1 of these questions also for 5 answer in 3 sentences thx!!!!
(Will mark as brainliest) promise
:D
Answer:
Comparative Anatomy:
5. Comparative anatomy is the comparative study of the body structures of different species of animals in order to understand the adaptive changes they have undergone in the course of evolution from common ancestors.
One way whales are different from fish is:
1) Whales actually breathe air with lungs using their blowholes to breath out!. Fish get oxygen directly from the water through their gills.
Hope this helps! :D
Does anyone know this answer ?
Answer:
sorry I can't able to help you
Explanation:
[tex]hii[/tex]
have a nice day ✌️✌️
What's the correct IUPAC name of the structure shown?
A. Methylhexene
B. 4-methylhex-1-ene
C. Hex-1-ene
D. 3-methylhex-5-ene
Answer:
B. 4-methylhex-1-ene
Explanation:
There are 6 carbons for the main molecule of 1-hexene. They are counted from the first (1) on the terminal C with the double bond (ene). A methyl group is hanging on carbon number 4, so it is the 4-methyl.
4-methylhex-1-ene.
Which of the following could make a decomposition reaction occur?
heat or light
time
nothing needed for most to proceed
Heat or light could make a decomposition reaction occur. Therefore, option (A) is correct.
What are decomposition reactions?
The decomposition reactions can be described as in which one reactant breaks into one or more products during the reaction.
The decomposition reaction can be represented as the following equation:
AB → A + B
Where AB is the parent molecule that acts as a reactant and gives A and B as products.
A decomposition reaction can be possibly an exothermic reaction or endothermic reaction. Thermal decomposition reactions are those in which the energy is supplied to reactant molecules for the decomposition.
For example, the decomposition of calcium carbonate is a thermal decomposition reaction. In the products, carbon dioxide gas and calcium oxide are produced. The decomposition of ozone gas occurs in the presence of light.
Therefore, heat or light can make the decomposition reaction take place.
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Given the reaction fe o2 right arrow. fe2(3 )o3(2-), what happens to the oxidation states of these elements? fe o
The oxidation state of iron changes from 0 to +3, and of oxygen changes from 0 to -2.
What is oxidation state?Oxidation state of any atom will tells about the number of exchangeable electrons.
Given chemical reaction is:
Fe + O₂ → Fe₂O₃
Initially in the reactant form, oxidation state of iron (Fe) atom and oxygen (O₂) molecule is zero as they are in elemental form. Oxidation state of 2 iron atoms in the product (Fe₂O₃) is +3 as it is combined with the 3 atoms of oxygen whose oxidation state is -2.
Hence, oxidation state of Fe and oxygen changes as we going from reactants to product side.
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Answer:
B and A
Explanation:
is thermal decomposition a redox reaction?
Answer:
yes.
Explanation:
the definition of a redox reaction is a chemical reaction in which electrons are transferred between two reactants participating in it, meaning, thermal decomposition is a chemical reaction where a substance is being broken down hence, electrons being transfered.
What chemical equations must be balanced to satisfy ?
Answer:
the law of conservation of matter
Explanation:
that states that matter cannot be produced or destroyed in a closed system. The law of conservation of mass governs the balancing of a chemical equation.
(Will give brainlest if right)Which substance can be broken down chemically ? A) Ammonia B)aluminium C)Argon
Answer:
i believe its b but i could be wrong
can you balance 12 blocks on the 3x2 platform
1.
Which weather pattern can drop torrential amounts of rain, create storm surges, and destroy structures with high winds?
drought
tornado
hurricane
thunderstorm
2.
What is the main energy source for a hurricane?
winds blowing from high pressure to low pressure
warm air masses
cool ocean water
warm ocean water
3.
What makes the weather inside the eye of the storm calm and clear?
high pressure air
low pressure air
clockwise rotation
counterclockwise rotation
I will mark brainliest.
*These three questions are strictly for study.
1) Hurricane
A hurricane can cause destruction at a high scale2) winds blowing from high pressure to low pressure
when the clouds take up the hot vapours , making the atmosphere warm ,the pressure increases resulting in formation of wind and when these winds wind up to make a huge pattern which we call hurricane3) Clock wise rotation
The clockwise rotation moving a same direction helps to make the eye visible to usWhat would happen if sodium and potassium are placed in hot water?
Solid zinc and aqueous lead (II) nitrate react to from aqueous zinc (II) nitrate and solid lead.
Zn(s) + Pb(NO₃)₂ (aq) → Zn(NO₃)₃ (aq) + Pb (s)
Further explanationThere are two types of chemical reactions that may occur.
single-replacement reactions and double-replacement reactions.
A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds
A + BC ⇒ AC + B
Not all of these reactions can occur. We can use the activity series, which is a list of elements that can replace other elements below / to the right of them in a single replacement reaction.
This series is better known as the Volta series, where the metal element with a more negative electrode potential is on the left, while the element with a more positive electrode potential on the right.
The more left the position of a metal in the series, the more reactive metal (easy to release electrons)
Generally, the Volta series used is
Li K Ba Sr Ca Na Mg Al Mn Zn Cr Fe Cd Co Ni Sn Pb H Sb Bi Cu Hg Ag Pt Au
Solid zinc and aqueous lead (II) nitrate react to from aqueous zinc (II) nitrate and solid lead.
Can be expressed in chemical equations :
Zinc + aqueous lead (II) nitrate ⇒aqueous zinc nitrate + lead metal
Zn(s) + Pb(NO₃)₂ (aq) → Zn(NO₃)₃ (aq) + Pb (s)
Reactants : Zn and Pb(NO₃)₂
Products : Zn(NO₃)₃ and Pb
The existing Zinc element can replace the Lead element, which is on the right side of Zn, so the reaction will occur.
Several models of atoms are mentioned in this lesson. Plum pudding, planetary and quantum mechanical. Which reason below explains why there are different atom models?
Because atoms have changed their structure over time
Because there are different types of atoms
Because the ideas about the models changed as more discoveries were made about the atom
Because many people came up with models at the same time
Answer:
Because the ideas about the models changed as more discoveries were made about the atom
Explanation:
I know because i took this test and made a 100% on it
hope I was helpful :)
What does speed means
Answer:
Speed is a form of energy or momentum that represents a person's move rate.
[tex]Example:[/tex]
The snail is moving m Miles per hour.I am driving at 50 Mph.I took miles per hour and used it as an example[tex].[/tex]
Hope this helps!
I’m marking BRAINLIEST for whoever answers first. and this is science.
Answer:
The right answer is electrons :)
Answer:
Magnetism is caused by the motion of:
Option 3, electrons.
Explanation:
Because every substance is made up of these tiny units called atoms. And each atom has electrons, particles that carry electric charges.
Hope this helps you out!