Answer:
Combustion
Explanation:
An exothermic reaction is defined as a reaction that releases heat and has a net negative standard enthalpy change. Examples include any combustion process, rusting of iron, and freezing of water.
Combustion is a type of exothermic chemical reaction that generates light and heat in most cases, and occurs fairly quickly.
What is an exothermic reaction?An exothermic reaction is one that when it occurs releases energy in the form of heat or light to the environment.
Characteristics of an exothermic reactionWhen this type of reaction occurs, the products obtained have lower energy than the initial reactants.Most of the exothermic reactions are oxidation, and when they are very violent they can generate fire, as in combustion.Combustion is a very fast oxidation reaction that occurs between materials called fuels and oxygen.Therefore, we can conclude that combustion is an example of an exothermic reaction that releases large amounts of heat, which can lead to fire.
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In an experiment, equal amounts of water and sand were heated under a lamp. The initial and final temperatures of each were recorded. A partial record of the temperature is shown.
Experimental RecordSubstance Initial Temperature Final Temperature
Sand 20 °C 26 °C
Water 20 °C ?
Which statement about the final temperature of water is correct?
A. It will be less than 26 °C as sand has a relatively higher specific heat than water.
B. It will be less than 26 °C as water has a relatively higher specific heat than sand.
C. It will be more than 26 °C as sand needs relatively higher energy than water to raise its temperature.
D. It will be more than 26 °C as water needs relatively higher energy than sand to raise its temperature.
hi have a nice day
will be less than 26 °C as water has a relatively higher specific heat than sand.
Explanation:
The specific heat of a substance is the amount of heat energy absorbed by one unit of mass of the substance when its temperature increases one unit.
From that, you can derive the equation for the specific heat of a substance:
specific heat = heat / (mass × ΔT)
Thus, assuming that all the heat provided by the lamp to both samples is the same and, as given, the amount (mass) of both samples is also the same, you have that the specific heat of the samples will be:
specific heat = constant / ΔT
So, specific heat and ΔT are inversely related.
It is known that water has a higher specific heat than sand (that is why the sand on the shore of a beach is, during the day, hotter than the water and your feet get burned when you walk on a sandy beach on a sunny day
the normal human eye responds to visible light of wavelength range from about 390 to 710nm. Determine the frequency range of the human eye.
Explanation:
=>7.7 x10¹⁴ to 4.2 x10¹⁴Hz
14. Which has the lowest ionization energy?
A. beryllium (Be) B. strontium (Sr) Calcium (Ca) D. magnesium (Mg)
Answer: B. strontium
Explanation: This is due to electrons being further away from the nucleus in strontium.
Check the box under each molecule in the table below that is an isomer of this molecule:
The branched alkanes in boxes two and three all have molecular formula C6H14 and are isomers of the compound shown.
Isomers are compounds that has the same molecular formula but different structural formulas. Hence, isomers of compounds can be represented by the same molecular formula since they contain the same number of each atom.
The molecule shown has molecular formula C6H14. The branched alkanes in boxes two and three all have molecular formula C6H14 and are isomers of the compound shown.
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1. Which of the following shows the process of freezing?'
A.candle wax cooling on the table
B.pouring cola over ice
C. heating a cup of water
D. particles are speeding-up and colliding more
Answer:
A. candle wax cooling on the table
Explanation:
Candle wax cooling on a table is an example of freezing because the atoms in the candle wax start to slow down as the wax cools. This is considered "freezing" because the slower an atom is vibrating then the colder it is and of course the faster an atom is vibrating then the hotter it is! :)
How many moles does 205 g of helium,He, contain ?
Answer:
4.002602
Explanation:
Seems Am Converting Between Grams Helium And Mole.
Determine the number of moles in 4.9*10 raise to the power of 24 of Ag
Answer:
4.5425806678891E+22mol
Explanation:
what is the correct sequence of stages in cellular respiration
Answer:
Explanation:
Glycolysis
Pyruvic acid oxidation
Curbs cycle or citric acid cycle.
Respiratory chain.
Have a great night!
Q5. A 1.35 m solution of NaCl in water is prepared. What is the mole fraction of
the NaOCI? 0.0237
Answer:
A solution contains 0.100 mol of NaCl dissolved in 8.60 mol of water.
Explain the verse below in your own words in a little summary.
Hebrews 11:7
God had warned Noah of the flood and directed him to build an ark. Noah had faith in God and began building.
Answer:
God Warned Noah for the Flood comindg to Earth to wash away all the bad people's lives and god also said get couple animals girls and boys then build an ark then bring your family and food there to then noah had a faith in god so he obey and start builind the ark in a top of a mountain
Explanation:
Hebrews 11:7
calculate the number of molecules in 4.48dm3 of hydrogen at STP
Answer: 1 more of hydrogen =22.4dm3
X moles of hydrogen =4.48dm3
22.4dm3x = 4.48dm3
4.48dm3\22.4dm3
X=0.2 moles
Explanation: 1 volume of hydrogen at STP is 22.4dm3
napthalene combustion can be used to calibrate the heat capacity of a bomb calorimeter The heat of combustion of naphthalene is -40.1kj/g. When .8210g of naphthalene was burned in a calorimeter containing 1,000g of water, a temperature rise of 4.21C was observed. What is the heat capacity?
A bomb calorimeter with a heat capacity of 3.63 kJ/°C experiences a temperature rise of 4.21 °C when .8210 g of naphthalene is burned.
The combustion of naphthalene is used to calibrate the heat capacity of a bomb calorimeter.
What is a bomb calorimeter?It is a device used to measure the change in the internal energy of a reaction.
To determine the heat capacity of the calorimeter (C), we need to follow a series of steps.
Step 1: Calculate the heat released by the combustion.The heat of combustion of naphthalene is -40.1kJ/g and .8210g were burned.
Qcomb = -40.1kJ/g × .8210g = -32.9 kJ
Step 2: Determine the heat absorbed by the bomb calorimeter.According to the law of conservation of energy, the sum of the heat released by the combustion and the heat absorbed by the bomb calorimeter is zero.
Qcomb + Qbomb = 0
Qbomb = -Qcomb = 32.9 kJ
Step 3: Calculate the heat capacity of the bomb calorimeter.32.9 kJ were absorbed, part by the calorimeter itself and part by the 1,000 g (m) of water, whose specific heat capacity (c) is 4.18 J/g°C.
A temperature rise (ΔT) of 4.21 °C is observed. We can determine the heat capacity of the bomb calorimeter (C) using the following expression.
Qbomb = Qcal + Qwater
32.9 kJ = C × ΔT + c × m × ΔT
32.9 kJ = C × 4.21 °C + (4.18 × 10⁻³ kJ/g.°C) × 1,000 g × 4.21 °C
C = 3.63 kJ/°C
A bomb calorimeter with a heat capacity of 3.63 kJ/°C experiences a temperature rise of 4.21 °C when .8210 g of naphthalene is burned.
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How many teaspoons are equal to 1 mole of water if there is 0.23 teaspoon for every 1 g?
A. 0.46 teaspoon
B. 3.68 teaspoons
C. 4.14 teaspoons
D. 18 teaspoons
Answer:it's b hope that help
The molar mass of water is 18 g. Given that there are 0.23 teaspoon for every 1 g. Thus , for 18 g there would be 4.14 teaspoons.
What is one mole?Any substance that contains 6.022 × 10²³ number of atoms is called one mole of that substance. The mass of a compound or molecule containing these much atoms is called its molar mass.
Molar mass of water is 18 g. Thus, it means that one mole of water weighs 18 g. Given that for every 1 g of water there are 0.23 teaspoon. Thus, number of teaspoons for one mole or 18 g of water is:
number of teaspoons = 18 g × 0.23 /1 g
= 4.14 teaspoons.
Therefore, 4.14 teaspoons are required for one mole of water.
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( picture ) identify each type of reaction shown below
it wouldnt let me type it because it said it was too inappropriate
Explanation:
USCTIR ENFIK meaning?
Answer:
la branche de la mécanique concernée par le mouvement des objets sans référence aux forces qui provoquent le mouvement
Answer:
the features or properties of motion in an object.
Pls help!
Describe ionic and covalent bonding.
Give an example of each
Answer:
Example of ionic bonds— Sodium chloride and calcium oxide. Example of covalent bond— Water, carbon
Explanation:
ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.
Consider the gas phase reaction 4HCl + O2 → 2Cl2 + 2H2O. What volume of chlorine gas at STP can be prepared from the reaction of 600. mL of gaseous HCl, measured at STP, with excess oxygen?
a. 150 mL b. 267 mL c. 300 mL d. 425 mL e. 600 mL
Answer:
c
Explanation:
The value of probability density will be
The probability density function is nonnegative everywhere, and its integral over the entire space is equal to the terms "probability distribution function" and "probability function" .
What is probability density function?
In probability theory, a probability density function (PDF), or density of a continuous random variable, is a function whose value at any given sample (or point) in the sample space (the set of possible values taken by the random variable) can be interpreted as providing a relative likelihood that the value of the random variable would be equal to that sample.
Probability density is the probability per unit length, in other words, while the absolute likelihood for a continuous random variable to take on any particular value is 0 (since there is an infinite set of possible values to begin with), the value of the PDF at two different samples can be used to infer, in any particular draw of the random variable, how much more likely it is that the random variable would be close to one sample compared to the other sample.
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the property of matter that determines whether or not an electrical current can pass through it
What equipment is generally used to make lyophilized medications suitable for administering to the patient? a) Test tubes or sterile ampules b) Petri dishes and sterile droppers c) Sterile syringes or graduated cylinders d) Measuring cups and clean, warm water
The answer is (B) !
Explanation:
Petri dishes and sterile droppers is generally used to make lyophilized medications suitable for administering to the patient.
Which element on the periodic table is the lowest mass in period 4??
Answer:
potassium I believe is the correct answer
Explanation:
Potassium is the period four element with the lowest mass; its average mass is 39.0983amu.
The fourth period of the periodic table is where potassium has its lowest atomic mass.
What is atomic mass?Atomic mass is defined as the combined mass of an atom's protons, neutrons, and electrons. The term "atomic mass" refers to the weight of an atom or molecule. To determine the average mass of elements and molecules as well as to resolve stoichiometry issues, the atomic mass is used.
An electrically neutral atom has an equal number of protons and electrons. As a result, using any of the two formulas, we may calculate the atomic mass of an element. The atomic mass of an element grows as we move from left to right in a period of the periodic table. In the fourth period of the current periodic table, Krypton has the highest atomic mass and potassium has the lowest.
Thus, the fourth period of the periodic table is where potassium has its lowest atomic mass.
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Write the IUPAC names for the following compounds.
- 5. Venus is like Earth because A. They both have oceans, air, and plant life. B. They both have people living on them. C. They are about the same size and have about the same amount of gravity.
Answer:
C
Explanation:
Answer:
c
Explanation:
Venus and Earth are often called twins because they are similar in size, mass, density, composition and gravity. Venus is actually only a little bit smaller than our home planet, with a mass about 80% of Earth's.
why are electric switches and boards are made up of plastic
why are electric switches and boards are made up of plastic
Answer:-Because plastic is a poor conductor of electricity.
Explanation:-Plastics do not conduct enough heat and electricity. Therefore, it is used in the manufacture of plug switches, plug boards, etc.
Fe3+ and S2- write the formula for the compound that would be formed
Which of these is a characteristic of warm air?
It transfers energy through radiation.
Its molecules are far apart.
It sinks due to convection.
It cools the land below it.
Answer: B.
Explanation:
Warm air molecules are far apart, while cool air molecules are packed closer together.
Answer: A It Transfers energy through radiation
Explanation: I jut got done with the exam 15 min ago
PLEASE HELP WILL GIVE BRAINLIEST
Answer:
55 centimeters
Explanation:
20+15+25
A bottle rocket takes off with a speed of 13 m/s and is angled 55 degrees above the horizon. What is the Y component of the velocity ?
Answer:
10.53m/s
Explanation:
Initial velocity: 13m/s
Angle of projection: 55deg
Y-component of velocity is given as usin⌀
Plugging in, we get
= 13 * sin(55deg)
= 13 * 0.81
= 10.53
⇒ 10.53m/s
How how how how how
Hello Americans greetings from the Philippines
Answer:
good day philipines
Explanation:
Answer:
hello
Explanation:
Brainliest for best answer
b is answer
Explanation:
please follow me
Answer:
B is the answer
Explanation:
A is incorrect as there is 2 O2 on the RHS while there is only 1 O2 on one side
B is correct as it is going through a process called combustion and I don't feel like explaining it is too long T^T
C is incorrect as the 3 results in multiply N (3 Nitrogen) while there is only one N2
D is definitely incorrect -.-
Hope this helps
(P.S. I lost a lot of my brain cells x-x)