Question 3 of 10
Which event indicates an endothermic chemical reaction?
A. Decrease in temperature
B. Release of heat
C. Increase in thermal energy
D. Production of light



Plz help

Answers

Answer 1

Answer:

A. Decrease in temperature

Explanation:

Answer 2

The statement indicates an endothermic chemical reaction is "Decrease in temperature".

What is endothermic reaction?

Endothermic reactions generate products by absorbing heat energy from the environment.

The temperature of the reaction mixture rises as energy is released in an exothermic process. The temperature drops when energy is absorbed in an endothermic reaction. A thermometer can be used to monitor temperature changes in the reaction mixture.

An endothermic reaction happens when the temperature of an isolated system drops while the temperature of its surroundings rises. The overall heat of reaction in endothermic reactions is positive (q > 0).

Hence the correct option is A.

To know more about endothermic reactions here

https://brainly.com/question/23184814

#SPJ2


Related Questions

How many grams are contained in the quantity 0.34 mol Ca

Answers

Answer:

13.6272 Grams

Explanation:

Moles of Calcium × atomic weight = Grams

0.34 × 40.08 = 13.6272

0.34 Moles of Calcium = 13.6272 Grams

How many aluminum ions are present in 65.5 mL of 0.210 M All3solution?

Answers

Answer:

Aluminium ions present's in 65.5mL of 0.210

M All 3solution is Given below-:

Answer and Explanation: 1

The first step is to determine the moles of aluminum ions. This utilizes the volume, molar concentration, and subscripts from the chemical formula of aluminum (III) fluoride as shown.

65.5 mL×1 L1000 mL×0.210 mol AlF31 L×1 mol Al3+1 mol AlF3=0.013755 mol Al3+65.5 mL×1 L1000 mL×0.210 mol AlF31 L×1 mol Al3+1 mol AlF3=0.013755 mol Al3+

To calculate for the number of aluminum ions, we use Avogadro's number as shown.

0.013755 mol Al3+×6.022×1023 ions1 mol Al3+=8.28×1021 ions Al3+.

Itz the ans. of collage ok man.

Answer:

m0.013755

m

o

l

A

l

3

+

×

6.022

×

10

23

i

o

n

s

1

m

o

l

A

l

3

+

=

8.28

×

10

21

i

o

n

s

A

l

3

+

L

×

1

L

1000

m

L

×

0.210

m

o

l

A

l

F

3

1

L

×

1

m

o

l

A

l

3

+

1

Explanation:

The first step is to determine the moles of aluminum ions. This utilizes the volume, molar concentration, and subscripts from the chemical formula of aluminum (III) fluoride as shown.

65.5. To calculate for the number of aluminum ions, we use Avogadro's number as shown.

A sample of carbon dioxide gas has a pressure of 8.33 bar and a volume of 10.3 mL at a temperature of 29.1 °C. How many
molecules of carbon dioxide gas are in the sample?
molecules:

Answers

Answer : what the rules of 8.33 because the 8.33 that is the right place for reason

Describe two or three ways in which the measurements you made could lead to errors in the results. Explain how each error would affect the answer of molar mass. In other words, would the molar mass go up or down and why

Answers

Answer:Physical and chemical laboratory experiments include three primary sources of error: systematic error, random error and human error

Explanation:

When examining the root mean square speed equation, we can see that the changes in temperature (T) and molar mass (M) affect the speed of the gas molecules. The speed of the molecules in a gas is proportional to the temperature and is inversely proportional to molar mass of the gas.

what is chemical reaction ? ​

Answers

A chemical reaction is like a process with one or more substances which are also called reactants, they are converted to one or more different substances which are also known as products.

Hope that helps you out.
a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.

How many total bonds (Total shared pairs) are in the lewis structure for HSiN and CO2?

Answers

Answer:

2

Explanation:

Hope it can help you lovelots

#LEARN WITH BRAINLY

Airflow through a long 0.2m square air conditioning duct maintained the outer duct surface temperature at 10degree.if the horizontal duct is uninsulated and exposed to air at 35degree in the crawl space beneath at home.
What is the heat gain per unit length of the duct.

Answers

Answer:

125°C/m

Explanation:

The difference in temperature will be:

35 - 10 = 25

The outer duct surface is heated 25°C by the air from 10°C to 35°C;

This heat gain is simply divided by 0.2m to get heat gain per unit length:

25/0.2 = 125

125°C/m

If you're American, this will be °F I believe, so the answer will be:

125°F/m

What is the percent composition of Be(OH)2?

Answers

Answer:

Ba 80.148%. H 1.77% O 18.657%

the role of haemoglobin in the transport of oxygen and carbon dioxide

Answers

Hemoglobin with bound carbon dioxide and hydrogen ions is carried in the blood back to the lungs, where it releases the hydrogen ions and carbon dioxide and rebinds oxygen. Thus, hemoglobin helps to transport hydrogen ions and carbon dioxide in addition to transporting oxygen.

1. Write a balanced chemical equation, including physical state symbols, for the combustion of methane in gaseous gaseous carbon dioxide.

Answers

Answer:

CH4(g)+2O2(g)→CO2(g)+2H2O(g)

Explanation:

For a complete combustion reaction of a hydrocarbon, oxygen is always one of the reactants, and the products are always carbon dioxide and water.

Find the volume of 0.160 M sulfuric acid necessary to react completely with 75.0 g sodium hydroxide.

Answers

The volume of 0.160 M sulfuric acid necessary to react completely with 75.0 g sodium hydroxide is 0.15L

The reaction of sulphuric acid and sodium hydroxide is expressed as:

[tex]2NaOH + H_2SO_4 ==> Na_2SO_4 + 2H_2O[/tex]

Determine the moles of NaOH present

Molar mass of NaOH = 23 + 16 + 1 = 40g/mole

Given that mass of NaOH is 75.0g

Mole of NaOH = 75/40  = 1.875moles

Determine the number of moles [tex]H_2SO_4[/tex] needed to react with 1.875 moles NaOH

Moles of [tex]H_2SO_4[/tex] = [tex]\frac{1.875}{2} = 0.9375moles of H_2SO_4[/tex]

Recall that volume = Molar mass * number of moles

Volume of [tex]H_2SO_4[/tex] =  0.160 * 0.9375

Volume of  [tex]H_2SO_4[/tex] = 0.15L

Hence the volume of 0.160 M sulfuric acid necessary to react completely with 75.0 g sodium hydroxide is 0.15L

Learn more here: https://brainly.com/question/837939

Explain why Florida does not have long winters?

Answers

Because of the area on the Earth they are on and the tilt of the earth

A city carrier resigns and trains as an office receptionist this is a person’s metabolism is likely to

Answers

Answer: results from a combination of a person’s metabolic heat and environmental heat

A piece of potato had an original mass of 3.2g and after being left in a sugar solution for 24 hours it then had a mass of 2.8g. Calculate the percentage mass decrease of the potato.

Answers

Answer: -13% to 3 sig figs

Explanation:

A piece of potato had an original mass of 3.2g and after being left in a sugar solution for 24 hours it then had a mass of 2.8g. Calculate the percentage mass decrease of the potato.

the change in mass is 2.8 -3.2 = -0.4 gm

the % change fro  the origial piece is ( -0.4/3.2) X 100 = -12.5%

or  -13% to 3 sig figs

a guy walks into a bar and sees a non-linear person. he says hey wt y=mx+b is this? he threw a sploddy gun grenade in the place. how many non-linear people did he hurt?

Answers

Um I literally don’t know
I don’t know at all like this is completely different then what I know what grade level is this?

Be sure to answer all parts. Select the anti periplanar geometry for the E2 reaction of (CH3)2CHCH2Br with base. mc2x mc2xd1 mc2xans mc2xd2 Then draw the product that results after elimination of HBr. draw structure ...

Answers

The anti periplanar geometry for the E2 reaction of (CH3)2CHCH2Br with base is shown in the image attached as well as the structure of the product formed in the reaction.

In organic chemistry, an antiperiplanar conformation is one in which the groups point up and down at a dihedral angle of 180° away from one another. In the image attached, the antiperiplanar conformation of (CH3)2CHCH2Br is shown.

Recall that an E2 reaction is a synchronous elimination reaction where to atoms leave at the same time. The product of this reaction is also shown in the image attached.

Learn more: https://brainly.com/question/2510654

Wyndirbu lie the following best describes the role played by
hydraulic fluid a hydraulic machine?
А
A source of fuel
B
A medium for the transfer of force
С
A coolant
D
A cleaning agent


Help pls

Answers

The role played by hydraulic fluid in a hydraulic machine is as a medium for

the transfer of force.

Hydraulic fluid is used primarily in a hydraulic machine for the transfer of

force from one point to another. This makes the system able to perform the

required functions.

Hydraulic fluid also has other functions such as being a coolant and as a

cleaning agent(removal of contaminants) which aren't its major function.

Read more on https://brainly.com/question/25514384

How many photons are produced in a laser pulse of 0.593 J at 671 nm?

Answers

Explanation:

May kwento po ba yan o yan na talaga

HELP PLEASE I WILL GIVE BRAINLIEST PLEASE HELP ME

Explain the law of conservation of mass. Give an example of how mass is conserved using numbers to justify your answer.

Answers

Answer:

The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction.

For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.

Another example, solar panels don't create solar energy. They harness energy from the sun and transform it into another type of energy (electricity).

1) When a beam of white rays is dispersed by a prism which colour will be refracted to a larger extent?

Answers

Explanation:

since diferentes colours of light través at diferentes speeds, the refractiva index is diferentes for each color. The result? that whenthe White light países thought the prism it cover into a red light

What is measurement??


0000000000​

Answers

measurement is the process of finding the value of any Unknown physical quantities in standard value.

Mark me as a brainlist

Measurement has been defined as the concept widely used in math and science to quantify an object. It is used to denote the quantification of the event or the object with respect to other or individually.

Hence, the definition of measurement is the process of determining the size or smallness of a physical amount by comparing it to a reference quantity of the same kind as the object.

It has been used to determine the quantity to be small or large based on some predetermined standard or values. It compares the physical quantity like mass can be estimated using kilograms or grams.

Learn more about measurement, here:

https://brainly.com/question/2107310

#SPJ7

What is the concentration of chloride ions in solution after the reaction of 5.8 mL 0.12 M ammonium chloride with 3.2 mL 0.21 M silver nitrate

Answers

Answer:

ok

Explanation:

20 points! Please Help!!

Based on what you have read what is the opportunity cost of the glass-making company's decision?
a higher quaity tem
a greater proft
a loss of equipment
a longer production time​

Answers

Answer:

a greater profit......

name 2 elements that are liquid at room temperature and describe their colour​

Answers

Answer:

Bromine

Mercury

Bromine (symbol Br and atomic number 35) is a reddish-brown liquid, with a melting point of 265.9 K. Mercury (symbol Hg and atomic number 80) is a toxic shiny silvery metal, with a melting point of 234.32 K.

buna, am nevoie de un site de facut proiecte

Answers

Answer:

translation to English please

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

Answers

Answer:

B) Sterile droppers and petri dishes

my sheesh hurts my sheesh hurtsmy sheesh hurtsmy sheesh hurtsmy sheesh hurtsmy sheesh hurtsmy sheesh hurtsmy sheesh hurtsmy sheesh hurtsmy sheesh hurtsmy sheesh hurtsmy sheesh hurtsmy sheesh hurtsmy sheesh hurtsmy sheesh hurtsmy sheesh hurts

Answers

Answer:

1

Explanation:

Answer:

Um.....

Explanation:

Thanks for the pts

✌️❤️✌️

help me. correct answer will be marked as brnlst

Answers

Answer:

You are correct it is NaCl

Determine the wavelength of a radio station transmitting a broadcast at 520 Megahertz.

Answers

The wavelength of the radio station broadcasting at 520 megahertz is 0.58m.

HOW TO CALCULATE WAVELENGTH:

The wavelength of a wave can be calculated by dividing the speed of the wave by its frequency as follows:

λ = v/f

Where;

v= velocity of the wave (3 × 10⁸m/s)f = frequency (Hz)

According to this question, a radio station is transmitting a broadcast at 520 Megahertz. The wavelength is calculated as follows:

λ = 3 × 10⁸ ÷ 5.2 × 10⁸

λ = 0.577 × 10⁸-⁸

λ = 0.58m

Therefore, wavelength of the radio station broadcasting at 520 megahertz is 0.58m.

Learn more at: https://brainly.com/question/19601903?referrer=searchResults

What is the molarity of Ca(NO3)2 in a solution resulting from mixing 150.0 mL of 0.200 M HNO3 with 150.0 mL of 0.0100 M Ca(OH)2

Answers

The molarity of the Ca(NO3)2 solution would be 0.005 M

First, let us look at the balanced equation of the reaction:

[tex]2HNO_3+Ca(OH)_2 ---> Ca(NO_3)_2+2H_2O[/tex]

The mole ratio of HNO3 to Ca(OH)2 is 2:1.

Mole of HNO3 = molarity x volume

                            = 0.2 x 150/1000

                              = 0.03 mole

Mole of Ca(OH)2 = 0.01 x 150/1000

                             = 0.0015

Thus, there is no limiting or excess reactant.

Also from the equation, mole ratio of Ca(OH)2 to Ca(NO3)2 is 1:1. Hence, the mole of Ca(NO3)2 would also be 0.0015 mole.

The total volume of the resulting solution would be: 150 +150 = 300 mL

Thus, the molarity of the resulting Ca(NO3)2 would be:

Molarity = mole/volume

              = 0.0015/0.3

               = 0.005 M

More on molarity can be found here: https://brainly.com/question/12127540

Other Questions
What is the slope for 1,60,2,120,3,180,4,240 One day, Fiona and Heidi each bought coins at a coin shop. The equation f(x)=3x 12 represents the value of Fionas coin, in dollars, x years later. The graph shows the value of Heidis coin, in dollars, x years later. Select from the drop-down menus to complete the statement. When they bought their coins, Choose. Coin was worth Choose. More than Choose. Coin. A recipe for cinnamon rolls calls for 3 cups of flour for every cup of water. Using the same recipe, how much water will you need for 5 cups of flour? How many cups of water will you need for 5 cups of flour? What is the equation of the line that passes through (0, 3) and is perpendicular to y = = x + 5?5 mWhich of the following correctly describes the Europe First strategy?.It was a US foreign policy to let Europe handle the war by itself without US assistance.O B.It was an agreement among allies to end the war in Europe before the war in the Pacific.O C.It was a policy among European countries to remain neutral in wars outside the continent.OD.It was a US immigration policy prioritizing European immigrants over Asians or others. It is most commonly used for self-running presentations. A. Slide TransitionB. HyperlinkC. Action ButtonsD. Animation how does the author develop the theme through the passage a)through the father's story telling b) through brayden's evolving thoughts and actions c) through an extended metaphor about conservation d) through diction and figurative language What is the first step in the design process where you identify a problem that exists and gather information? Why the Constitution grants the president the power only to pass or veto a whole bill and not just parts of it? 2. What other things need to happen in order for a newcorrectional paradigm to be transformed andembraced? Qu son parte de la historia y cultura espaola? La msica flamenca. El Jarabe Tapato. La novela Don Quixote. El arte del Greco y Picasso. La cultura Azteca. Write a real-life word problem that can be solved using the system of inequalities below. Be sure to define the variables. x + 4y < 400 x + 6y > 400 Scoring Rubric Scoring Rubric Sample Responses: Two customers each bought the same table and some of the same chairs from a furniture store. The first customer bought 1 table and 4 chairs and spent less than $400. The second customer bought 1 table and 6 chairs and spent more than $400. What could be the price of each chair (y)? Kyle and Jasmine each bought tickets for a concert. Kyle bought 1 student ticket and 4 adult tickets and spent less than $400. Jasmine purchased 1 student ticket and 6 adult tickets and spent more than $400. What could be the price of the adult ticket (y)? Two head coaches bought shirts for their coaching staff. The first coach bought 1 head coach shirt and 4 assistant coach shirts and spent less than $400. The second coach bought 1 head coach shirt and 6 assistant coach shirts and spent more than $400. What could be the price of each assistant coach shirt (y)? Two customers each bought a surround sound system and new movies from an electronic store. The first customer bought the surround sound system and 4 new movies and spent less than $400. The second customer bought the surround sound system and 6 new movies and spent more than $400. What could be the price of each movie (y)? 2 Points The response indicates proficiency in creating real-life word problems that can be represented by given systems of inequalities. The response includes the definition of each variable. The student correctly completes the task. 1 Point The response indicates partial proficiency in creating real-life word problems that can be represented by given systems of inequalities. The student correctly completes the task but makes a minor error. Answers that give a word problem but do not involve a real-life situation receive 1 point. Answers that give a real-life word problem but do not include the definition of each variable receive 1 point. 0 Points The response indicates no proficiency in creating real-life word problems that can be represented by given systems of inequalities. The student shows no understanding of the concept or task. Answers that simply solve the system but do not give a word problem receive 0 points. very very dreadful chapter 2 summary????? Which could be the lengths of three sides of a triangle? a. 10 ft, 10 ft, 21 ft b. 19 ft, 11 ft, 3 ft c. 18 ft, 8 ft, 10 ft d. 12 ft, 25 ft, 35 ft e. 4 ft, 4 ft, 8.4 ft Brianna mixed 5 parts of orange juice and 2 parts of water to make a drink. How many parts of orange juice did Brianna mix with each part of water? Find an equation of the line passing through the point (2, 7) with slope m= 6. What is Osmosis? brainliest to anybody who can answer this correctly The data set represents the number of hours that fifteen students walked during a two-week period.6 6 7 8 8 8 9 10 10 12 13 14 15 16 30The median is 10 hours, Q1 is 8, Q3 is 14, and the IQR is 6 hours. Are there any outliers in the data? Explain or show your reasoning.please help you are spending some quality time with your grandparents and you notice your grandfathers face drooping and he is having difficulty speaking. what should you do? Given that breaking bonds requires energy and forming bonds releases energy, explain how we know that cellular respiration releases energy overall?