Answers
Answer:
Chemical Change
Explanation:
It is changeing color and taste
The toasting of marshmallows over a campfire is a chemical reaction.
What is a chemical change?A chemical change, often known as a chemical reaction, is the transformation of one or more components into new and distinct molecules or compounds.
Claim: When you toast marshmallows, the heat produces a chemical process that results in the formation of water molecules, which eventually evaporate, leaving carbon behind.
Evidence 1: The marshmallow become brown.Reasoning 1: When you toast sugar, it changes its chemical composition to form caramel, and the process is called caramelization.Evidence 2: The marshmallow melts.Reasoning 2: When the marshmallow is toasted, it melts down and becomes brown. This is a chemical change.Thus, these are the reasons why the toasting of marshmallows is a chemical change.
Learn more about chemical change, here:
https://brainly.com/question/1161517
Related Questions
A candle is placed between a concave mirror and its focal point.
Which two of the following best describe the image?
O A. Enlarged
B. Virtual
C. Reduced
D. Real
Answers
Virtual and enlarged..............
What grade are you in btw ?
A balanced equation has
Answers
Answer:
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.In other words, the mass and the charge are balanced on both sides of the reaction.
Explanation:
Sodium reacts with oxygen to produce sodium oxide.
4Na(s)+O2(g)→2Na2O(s)
How many grams of Na2O are produced when 32.2 g of Na reacts?
Answers
Answer:
32.2 g of Na will produce 43.4 g of Na2O.
Explanation:
The balanced chemical equation for the reaction between sodium and oxygen shows that 4 moles of sodium react with 1 mole of oxygen to produce 2 moles of sodium oxide:
4Na(s) + O2(g) → 2Na2O(s)
To solve this problem, we can use the following steps:
Step 1: Convert the mass of Na given in the problem to moles using the molar mass of Na.
molar mass of Na = 23 g/mol
moles of Na = mass of Na / molar mass of Na
moles of Na = 32.2 g / 23 g/mol
moles of Na = 1.4 mol
Step 2: Use the mole ratio from the balanced chemical equation to determine the moles of Na2O produced.
From the balanced chemical equation, we can see that 4 moles of Na react to produce 2 moles of Na2O.
moles of Na2O = (moles of Na / 4) x 2
moles of Na2O = (1.4 mol / 4) x 2
moles of Na2O = 0.7 mol
Step 3: Convert the moles of Na2O to grams using the molar mass of Na2O.
molar mass of Na2O = 62 g/mol
mass of Na2O = moles of Na2O x molar mass of Na2O
mass of Na2O = 0.7 mol x 62 g/mol
mass of Na2O = 43.4 g
Therefore, 32.2 g of Na will produce 43.4 g of Na2O.
A 1.00 liter solution contains 0.31 M sodium acetate and 0.40 M acetic acid. If 0.100 moles of barium hydroxide are added to this system, indicate whether the following statements are TRUE or FALSE . (Assume that the volume does not change upon the addition of barium hydroxide.)
a. The number of moles of CH3COOH will remain the same.
b. The number of moles of CH3COO- will increase.
c. The equilibrium concentration of H3O+ will decrease.
d. The pH will decrease.
e. The ratio of [CH3COOH] / [CH3COO-] will remain the same.
Answers
Answer and Explanation:
The buffer solution is composed by sodium acetate (CH₃COONa) and acetic acid (CH₃COOH). Thus, CH₃COOH is the weak acid and CH₃COO⁻ is the conjugate base, derived from the salt CH₃COONa.
If we add a strong base, such as barium hydroxide, Ba(OH)₂, the base will dissociate completely to give OH⁻ ions, as follows:
Ba(OH)₂ ⇒ Ba²⁺ + 2 OH⁻
The OH⁻ ions will react with the acid (CH₃COOH) to form the conjugate base CH₃COO⁻.
Initial number of moles of CH₃COOH = 0.40 mol/L x 1 L = 0.40 mol
Initial number of moles of CHCOO⁻= 0.31 mol/L x 1 L = 0.31 mol
moles of OH- added: 2 OH-/mol x 0.100 mol/L x 1 L = 0.200 OH-
According to this, the following are the answers to the sentences:
a. The number of moles of CH₃COOH will remain the same ⇒ FALSE
The number of moles of CH₃COOH will decrease, because they will react with OH⁻ ions
b. The number of moles of CH₃COO⁻ will increase ⇒ TRUE
Moles of CH₃COO⁻ will be formed from the reaction of the acid (CH₃COOH) with the base (OH⁻ ions)
c. The equilibrium concentration of H₃O⁺ will decrease ⇒ FALSE
The equilibrium concentration of OH⁻ is increased
d. The pH will decrease⇒ FALSE
pKa for acetic acid is 4.75. We add the moles of base to the acid concentration and we remove the same number of moles from the conjugate base in the Henderson-Hasselbach equation to calculate pH:
\(pH= pKa + log \frac{[conjugate base + base]}{[acid - base]}\)
pH = 4.75 + log (0.31 mol + 0.20 mol)/(0.40 mol - 0.20 mol) = 5.15
Thus, the pH will increase.
The ratio of a weak acid and its conjugate base at the point of maximum buffering capacity is a. 1/1 b. 1/10 c. 10/1 d. no definite ratio is needed
Answers
Option (a) is correct. The ratio of a weak acid and its conjugate base at the point of maximum buffering capacity is 1 : 1.
Weak acids are the acids which do not completely dissociate into their constituent ions when dissolved in solutions. It partially dissociates into its ions in an aqueous solution or water. Weak acids does not produce many hydrogen ions when it is in an aqueous solution. Conjugate base is said to be the particle that is left over after the acid loses its hydrogen ion. Conjugate bases are negatively charged and have high pH values. Conjugate base is produced when an acid loses a hydrogen ion.
According to Henderson-Hasselbalch Equation for the reaction is,
pH = PKa + log [base] / [acid]
At the point of maximum buffering capacity the concentrations of acid and base are equal. so, the logarithm of the concentrations of the acid and base is equal to 0. so the ration become 1:1.
To learn more about Henderson-Hasselbalch Equation please visit:
https://brainly.com/question/13423434
#SPJ4
Which of these is an example of a physical property?
A. Iron combines with oxygen to rust.
B. Potassium reacts in water to form a base.
C. Sodium metal is soft and malleable.
D. Sodium ignites when placed in water.
Answers
What are the possible values of 1 and m for
n=4 ?
Answers
Answer:
If n = 4, then the possible values of 1 and m depend on the equation or expression being used. Without more information, it is impossible to determine what the possible values of 1 and m might be. Can you please provide more context or information about the problem you are trying to solve?
I need to know the weighted average please!
Answers
Answer:
63.5456 amu
Explanation:
\(0.6917*62.9296+0.3083*64.9278= 63.5456\ amu\)
9. Compound A, with molecular formula C5H₁2 has only 1° and 4° carbons. What is its structure? Its other isomer has only 1°, 2° and 3° carbons. What is its structure also?
draw the structure
Answers
Answer:
Ok giv me a min
Explanation:
Which of the following molecules is the least polar?
A) H-H
B) H-CI
C) H-F
D) H-I
Answers
Answer: A) H-H is least polar
Explanation:
Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself. The more is the difference in electronegativity, the more polat the bond is.
1. H-H : Electronegativity difference = electronegativity of hydrogen - electronegativity of hydrogen =2.1 -2.1= 0
2. H-Cl : Electronegativity difference = electronegativity of chlorine - electronegativity of hydrogen = 3-2.1 = 0.9
3. H-F : Electronegativity difference = electronegativity of fluorine - electronegativity of hydrogen= 4-2.1= 1.9
4. H-I : Electronegativity difference = electronegativity of iodine - electronegativity of hydrogen= 2.5 -2.1= 0.4
Thus the least electronegativity difference between the bonded atoms is in H-H , this is least polar.
4. What is the difference between an open system and a
closed system?
Answers
Systems can exist in three ways as open systems, closed systems, and isolated systems. The main difference between open and closed system is that in an open system, matter can be exchanged with the surrounding whereas, in a closed system, matter cannot be exchanged with the surrounding.
btw why not just look it up on google? btw btw brainliest plz
What is the chemical formula for sulfuric acid?
Answers
How many moles are in 1.5 x 10^23 atoms of fluorine?
Answers
Answer: 0.125 moles F2
Explanation: 1.5x1023 atoms of F = 0.75x10^23 molecules F2
moles F2 = 0.75x10^23/avogadro number = 0.125 moles
There are 0.25 moles in 1.5 x \(10^{23}\) atoms of fluorine.
Given,
How many moles are in one atom?
In one mole we have,
6.02 x \(10^{23}\) atoms.
1 mole = 6.02 x \(10^{23}\) atoms
Find the number of moles in 1.5 x \(10^{23}\) atoms of fluorine.
We have,
1 mole = 6.02 x \(10^{23}\) atoms
Multiply 1.5 x \(10^{23}\) / 6.02 x \(10^{23}\) on both sides
1.5 x \(10^{23}\) / 6.02 x \(10^{23}\) x 1 mole = 1.5 x \(10^{23}\) / 6.02 x \(10^{23}\) x 6.02 x \(10^{23}\) atoms
1.5/6.02 mole = 1.5 x \(10^{23}\) atoms
0.25 moles = 1.5 x \(10^{23}\) atoms.
Thus there are 0.25 moles in 1.5 x \(10^{23}\) atoms of fluorine.
Learn more about finding the number of moles in 25.0g of ammonium here:
https://brainly.com/question/21732146
#SPJ2
How many electrons are shared in a double bond?
(1 point)
O 6 electrons
O 4 atoms
O 2 electrons
O 1 electron
Answers
Hope this helps
Of the following regions of the electromagnetic spectrum, which one has the shortest wavelength?
a.
gamma rays
b.
infrared
c.
radio waves
d.
X rays
e.
microwaves
f.
ultraviolet
Answers
Answer:
A ---->gamma ray
Explanation:
Gamma rays have the highest frequencies among all electromagnetic waves and therefore have the shortest wavelengths.
3. A Wilkinson’s catalyst is widely used in the hydrogenation of alkenes. Show a catalytic cycle, including: i. chemical structure of the catalyst, with complete stereochemistry ii. molecular geometry of catalyst iii. type of reactions involved iv. the appropriate starting material, reagent and solvent v. major and minor end-products vi. all intermediates, for each reaction stated in (iii)
Answers
We can see here that the catalytic cycle for the hydrogenation of alkenes using Wilkinson's catalyst involves several steps.
What are the steps involved?Here's an overview of the catalytic cycle, including the necessary details:
i. Chemical structure of the catalyst:
Wilkinson's catalyst, also known as chloridotris(triphenylphosphine)rhodium(I), has the following chemical structure: [RhCl(PPh3)3]
ii. Molecular geometry of the catalyst:
The Wilkinson's catalyst has a trigonal bipyramidal geometry around the rhodium center. The three triphenylphosphine (PPh3) ligands occupy equatorial positions, while the chloride (Cl) ligand occupies an axial position.
iii. Type of reactions involved:
The catalytic cycle involves several reactions, including:
Oxidative addition: The rhodium center undergoes oxidative addition, reacting with molecular hydrogen (H2) to form a dihydride intermediate.Alkene coordination: The alkene substrate coordinates to the rhodium center, forming a π-complex.Hydrogenation: The coordinated alkene undergoes hydrogenation, resulting in the addition of hydrogen atoms to the double bond and formation of a metal-alkyl intermediate.Reoxidation: The metal-alkyl intermediate reacts with a hydrogen molecule to regenerate the rhodium dihydride species.iv. Starting material, reagent, and solvent:
The starting material is an alkene, and the reagent is Wilkinson's catalyst ([RhCl(PPh3)3]). The reaction is typically carried out in a suitable solvent, such as dichloromethane (CH2Cl2) or tetrahydrofuran (THF).
v. Major and minor end-products:
The major end-product of the hydrogenation reaction is the fully saturated alkane, resulting from the addition of hydrogen across the double bond. The minor end-product may include cis- or trans-configured alkanes if the original alkene substrate possesses geometric isomers.
vi. Intermediates:
The intermediates in the catalytic cycle include:
Rhodium dihydride complex: [RhH2(PPh3)3]Alkene-Rhodium π-complex: [Rh(η2-alkene)(PPh3)3]Metal-alkyl intermediate: [Rh(alkyl)(PPh3)3]These intermediates play a crucial role in facilitating the hydrogenation reaction and enabling the catalytic cycle to proceed.
Learn more about Wilkinson’s catalyst on https://brainly.com/question/31972308
#SPJ1
1. Find the molarity of 25g of sodium hydroxide dissolved in 1L of water. Identify the solute and solvent in this solution.
please help me
Answers
Answer:
.6250 M
The Sodium Hydroxide is the solute, and the water is the solvent.
Explanation:
mol/volume= Molarity
(25/22.99+16+1.008)/1=.6250 M.
When sulfur dioxide forms from two non-metals, a covalent bond results when the electrons are
Answers
Answer:
heres your answer
To determine whether a bond is Covalent or Ionic, you must know the difference in electronegativity (a fancy word for describing how good a job a particular element does at attracting new electrons).
Explanation:
select the best description of the kinetic energy of two gas particles before and after a collision. luoa
Answers
Without additional information about the specific scenario of the gas particles, it is difficult to determine the best description of their kinetic energy before and after a collision.
What is Kinetic Energy?
It is a scalar quantity that is proportional to the mass of the object and the square of its velocity. The formula for kinetic energy is:
Kinetic energy = 0.5 x mass x velocity^2
where m is the mass of the object, and v is its velocity.
The kinetic energy of two gas particles before and after a collision depends on the mass, velocity, and direction of motion of the particles. If the particles are moving at the same speed and in the same direction before and after the collision, their kinetic energy will remain the same. However, if the particles have different masses or velocities, or if they collide at an angle or with a certain degree of elasticity, their kinetic energy may change as a result of the collision.
Therefore, without additional information about the specific scenario of the gas particles, it is difficult to determine the best description of their kinetic energy before and after a collision.
Learn more about Kinetic Energy from given link
https://brainly.com/question/25959744
#SPJ1
Sample Response: Matter is any substance that has
mass and takes up space. It can be identified using
physical properties such as density. Matter can change
states, which can be measured as boiling and melting
points. It can also be identified based on chemical
properties such as reactivity, flammability, and
composition.
What did you include in your response? Check all that
apply.
Matter is any substance that has mass and takes up
space.
Matter can be identified using physical properties
such as density and the boiling and melting points.
Matter can be identified based on chemical
properties such as reactivity, flammability, and
composition.
Done
Answers
The responses that can be included are : matter is any substance that has mass and takes up space, matter can be identified using physical properties, such as density and the boiling and melting points, matter can be identified based on chemical properties such as reactivity, flammability, and composition.
Matter is any substance that has mass and takes up space. This is a fundamental characteristic of matter, distinguishing it from non-material entities. Matter can be identified using physical properties such as density. Density is the measure of how much mass is contained in a given volume of a substance. Additionally, the boiling and melting points of matter can also be used to identify it. These points represent the temperatures at which matter changes from one state to another (e.g., from a solid to a liquid or from a liquid to a gas). Matter can also be identified based on its chemical properties. Chemical properties include reactivity, which refers to how a substance interacts with other substances; flammability, which indicates the ability to burn or ignite; and composition, which refers to the types and proportions of elements or compounds present in a substance. These characteristics and properties help scientists categorize and understand different forms of matter, enabling them to study and manipulate it for various purposes, such as in chemistry, physics, and engineering.
For such more questions on flammability
https://brainly.com/question/2583069
#SPJ11
Science is based primarily on peoples opinions and views of the subject matter.
True or false
Answers
Answer:
False
Explanation:
Science is not based on primarily on peoples opinions and views of the subject matter whereas science is based on empirical observations and research for its validity.
Science aims to find answers to human questions related to the natural world through their research observation and experiments. Scientists and researchers provide valid proof of human questions so that people can trust them.
Science can change people's opinions regarding the natural world with valid proof and observational theories but science is not based on people's opinion.
Hence, the given statement is "false".
Given the reaction below which of the following best describes the energy changes in this reaction?
Cu + Cl2 + energy —> CuCl2
Answers
Answer:
first choice
Explanation:
energy is written on the left side is its absorbed
2 elements came together so bonds are formed.
Determine the molar mass of NiCO3. Provide an answer to two
decimal places.
Answers
Answer:
67.01
Explanation:
The molar mass of NiCO₃ is 94.7 g/mol.
What is molar mass?"The molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound."
Molar mass = mass/mole = g/mol
There's another formula, if you don't have the mass number and moles of the compound then you can just at the relative atomic mass of all the given elements in the compound.
Main calculating the relative atomic mass, then this atomic mass is multiplied by the number of moles that is given in the compound.
Here the compound is NiCO₃
The atomic mass of Ni is 58.69
The atomic mass of C is 12.01
The atomic mass of O is 8
The moles are 58.69 x 1 = 58.69
Carbon is 12.01 x 1 = 12.01
O = 8 x 3 = 24
58.69 + 12.01 + 24 = 94.7
Thus, the molar mass of NiCO₃ is 94.7 g/mol.
To learn more about molar mass, refer to the below link:
https://brainly.com/question/22997914
#SPJ2
A __________ is a flowing, moving stream of water that feeds into a body of water.
hill
plain
plateau
river
Answers
Answer:
River
Explanation:
A solution is made by dissolving 38.81 grams of nickel (II) sulfate, NiSO4, in enough water to make 0.467
liters of solution. Calculate the molarity of this solution.
Answers
The molarity of the NiSO₄ solution made by dissolving 38.81 grams of nickel (ii) sulfate, NiSO₄, in enough water to make 0.467 liters of solution is 0.535 M
How do i determine the molarity of the solution?First, we shall obtain the mole of 38.81 grams of nickel (ii) sulfate, NiSO₄. Details below:
Mass of NiSO₄ = 38.81 grams Molar mass of NiSO₄ = 154.75 g/molMole of NiSO₄ = ?Mole of NiSO₄ = mass / molar mass
= 38.81 / 154.75
= 0.25 mole
Now, we shall determine the molarity of the solution. Details below:
Mole of NiSO₄ = 0.25 moleVolume of solution = 10.467 LMolarity of solution = ?Molarity of solution = mole / volume
= 0.25 / 0.467
= 0.535 M
Thus, the molarity of the solution is 0.535 M
Learn more about molarity:
https://brainly.com/question/16073358
#SPJ1
Grade 8 practice sheet "Vocabulary of Chemical Equations" | Easy
Answers
The information about the chemical reaction as given by the chemical equation is given below:
Word equation: Aluminum metal + oxygen gas ---> Aluminum oxideReactants: Aluminum metal and oxygen gasProducts: Aluminum oxideKnown states of matter: Aluminum metal is solid; oxygen is a gas; Aluminum oxide is a solidChemical Equation: 4 Al (s) + 3 O₂ (g) ---> 2 Al₂O₃ (s)What are chemical equations?Chemical equations are equations that represent chemical reactions that occur in a given system.
Chemical equations use symbols to represent the reactants and the products of a reaction.
The symbols used in chemical equations are the symbols of the elements or compounds involved in the chemical reaction.
Learn more about chemical equations at: brainly.com/question/26694427
#SPJ1
The pressure inside a tire is measured as 28.0 pounds/inches^2. What is its pressure in newtons/centimeters^2
Answers
The pressure inside the tire is approximately 1.970796 newtons per square centimeter (N/cm²) when measured in those units.
To convert the pressure from pounds per square inch (psi) to newtons per square centimeter (N/cm²), we need to use the conversion factors between these units.
First, let's convert pounds to newtons:
1 pound = 0.45359237 kilograms
1 kilogram = 9.80665 newtons
Next, let's convert square inches to square centimeters:
1 square inch = 6.4516 square centimeters
Now, we can perform the conversion:
1 psi = (0.45359237 kg) × (9.80665 N/kg) / (6.4516 cm²)
≈ 0.070307 N/cm²
Therefore, the pressure inside the tire of 28.0 psi is approximately equal to 28.0 × 0.070307 N/cm², which is approximately 1.970796 N/cm².
For more question on pressure
https://brainly.com/question/28012687
#SPJ8
A galvanic cell is powered by the following redox reaction:
2Zn2+(aq) + N2H4(aq) 4OH-zn2+ right arrow(aq) 2Zn(s) + N2(g) + 4H2O(I)
1. Write a balanced equation for the half-reaction that takes place at the cathode.
2. Write a balanced equation for the half-reaction that takes place at the anode.
3. Calculate the cell voltage under standard conditions.
Answers
Why burning gasoline in a lawnmower is not physical change
Answers
Answer:
Burning gasoline in a lawnmower is a chemical change.
Explanation:
Here, a combustion reaction takes place. Freezing water to make ice cubes, melting gold to make jewellery and boiling water for soup are examples of physical change since, only a change in physical state takes place.
Can I have little help please
Answers
Answer:
what do you need help with