chemical reaction occurs when the chemical identity of the reactants is different from that of the products. A new substance forms with different properties from the original react
Evidence that a chemical reaction has occurred can be a color change, light formation, gas bubbles formation, precipitate formation, or temperature change,
Use the following information to answer question 1.
QUESTION 1
Instant cold packs consist of ammonium nitrate and water. When the two are mixed, the temperature changes and becomes colder. It is described using the chemical equation
NH4NO3(s) → NH4+ (aq) + NO3(aq)
LA
Is this an example of an endothermic or exothermic reaction? Why?

Answers

Answer 1

Answer:

Explanation:

Exothermic: the surrounds feel warmer. A wood fire stove is a good example of an exothermic reaction. You can feel the heat on your hands. It's exothermic.

Endothermic is exactly the opposite. The reaction takes place, but the heat comes from the surroundings. When you touch something that goes through an endothermic reaction, it feels much cooler.

This reaction, just by definition is endothermic.


Related Questions

how did Alexander dye ?​

Answers

Answer:

After surviving battle after fierce battle, Alexander the Great died in June 323 B.C. at age 32. Some historians say Alexander died of malaria or other natural causes; others believe he was poisoned. Either way, he never named a successor.

Answer:

After surviving battle after fierce battle, Alexander the Great died in June 323 B.C. at age 32. Some historians say Alexander died of malaria or other natural causes; others believe he was poisoned. Either way, he never named a successor

Explanation:

hope it helps

what is the difference between hydrophilic and hydrophobic?

Answers

Hydrophilic - attracted to water
Hydrophobic - resists water

Q2. Fill in the blank with correct words.
A: Chemical B: Horizontal C: Shells D: Columns E: Group VII

1) The vertical ___________are called groups and the_____________rows are
called periods.
2) Elements in the same groups have the same number of electrons in their
outer_______________ for example, all the elements in ___________ have 7
electrons on their outer shells.
3) Elements in the same group have similar ___________ and physical properties

Answers

Answer:

Explanation:

1) The vertical Columns are called groups and the Horizontal rows are

called periods.

2) Elements in the same groups have the same number of electrons in their

outer Shells for example, all the elements in Group VII have 7

electrons on their outer shells.

3) Elements in the same group have similar Chemical and physical properties

Explanation:

1) Columns

Horizontal

2)Shell

Group VII

3)Chemical

What percentage of the Periodic Table of Elements is Metals?

Answers

80 percent

About 80 percent of the elements are metals (shiny elements that conduct heat and electricity well), and 15 percent of the elements are nonmetals (poor conductors of heat and electricity). The remaining elements are metalloids, which share properties of both metals and nonmetals.

Answer:

80% of the Periodic Table consists of metals and 15% non-metals and 5% other elements.

Explanation:

HELP ME PZLMSMS
E
D
D
F

F




Answers

Answer:

10.C

11.B

15.A

Explanation:

Which elements are the most reactive and why?

Answers

Answer:

Fluorine is identified as the most reactive nonmetal and the most electro-negative element in the periodic table, making it the strongest oxidizing agent. Caesium is the most reactive metal in the periodic table, so much that working with this metal often ends in explosions!

Hydrogen is a very reactive gas, and the alkali metals are even more reactive. In fact, they are the most reactive metals and, along with the elements in group 17, are the most reactive of all elements.

Hope that helps.

Alkali metals (situated far away from transitional metals and noble gases) are the most reactive elemental group. Cesium is second from the bottom of this group, with 6 electron shells, so it fits all the characteristics of a reactive atom, therefore making it the most reactive element.

How can you tell the difference between two clear liquids

Answers

Answer:

To identify a pure liquid substance using the physical properties of solubility, density, and boiling point. The physical properties of a pure substance can be measured without changing the composition of the substance.

Explanation:

what is the mechanical hound in the book fahrenheit 451

Answers

Explanation:

The Mechanical Hound is a robotic animal that firemen can deploy to hunt and catch fugitives. It can be trained and programmed to hunt its prey very quickly by smell. Once it catches its prey, the Hound injects the person with a sedative; unable to run, the drugged fugitive is easily captured.

how many moles of oxygen would you need to produce 4 moles of aluminum oxide? 4 Al + 3 O2 ----> 2 Al2O3

Answers

Answer:

6 moles

Explanation:

3 moles of O2 produce 2 moles of Al2O3 so in order to produce 4 moles pf AL2O3 you need 4 x 3 /2 moles of O.

Write a balanced equation and name the products of the reaction CaCl2+Na3(PO4)

Answers

Answer:

3CaCl2 + 2Na3(PO4) → Ca3(PO4)2 + 6NaCl

Explanation:

DOUBLE REPLACEMENT REACTION

CaCl2 + Na3(PO4) → Ca3(PO4)2 + NaCl

3CaCl2 + 2Na3(PO4) → Ca3(PO4)2 + 6NaCl

calcium chloride + sodium phosphate → calcium phosphate + sodium chloride

Hope that helps

5. Scientists always develop a plan when they try to learn something about our natural world. Which
sequence correctly shows the steps scientists follow in their plan?
A. make observations, develop an idea, obtain evidence, suggest an explanation
B. obtain evidence, suggest an explanation, develop an idea, make observations
C. suggest an explanation, obtain evidence, make observations, develop an idea
D. develop an idea, suggest an explanation, obtain evidence, make observations

Answers

D. Develop an idea, suggest an explanation, obtain evidence, make observations. is correct

Nitrogen and oxygen can be separated from liquid air.State the name of this process.

Answers

Explanation:

Because of the earth and climate change the point of incidence mean that you mean by engineers to social evils activities.

11. The ease with which water can pass
through a rock or sediment is called
a. permeability c. porosity.
b. carbonation. d. velocity

Answers

Answer:

It's option a) Permeability.

Which of the following giant covalent structures is a good conductor of electricity?
a) polythene
b) diamond
c) graphite
d) silicon dioixide

Answers

I would go with C

Hope this helps

which reaction is an oxidation-reduction reaction?

Answers

Answer:

pl

saponification palmitate

What is a Chemical Properties and Physical Properties? Please tell me the deffinition of them both.

Answers

Answer:

All properties of matter are either physical or chemical properties and physical properties are either intensive or extensive. ... Physical properties can be measured without changing a substance's chemical identity. Chemical properties can be measured only by changing a substance's chemical identity.

Explanation:

2. The two naturally occurring isotopes of hydrogen are hydrogen-1 ( 1.00783 amu; 99.9885 percent) and hydrogen-2 (2.01410 amu; 0.0115 percent). What is the average atomic mass of hydrogen?

A. 1.0079 amu
b. 1.0097 amu
c. 1.0309 amu
D. 1.5110 amu

Answers

The answer for your question is D

Answer:

1.0079 g/mol

Explanation:

99.989% / 100% = 0.99989 hydrigen-1 , 0.0115% / 100% = 0.000115 hydrogen-2

0.99989 x 1.0078 = 1.0077 ,  0.000115 x 2.0141= 0.000232

1.0077 + 0.00023

Answer: 1.0079

It accounts for the differences in the behavior of particles in different states. *

Answers

Answer:

Matter

Explanation:

Solids, liquids, and gases are the three types of matter that can be found in the world around us today. In solids, all of the particles are close together. They move more in liquids, but they are spread out in gas.

a ___ wave is a disturbance in matter that transfers energy through the matter.

Answers

The answer is mechanical wave!

Hope this helps!
Brainliest and a like is much appreciated!

Answer:

Mechanical Waves

Do you think it is still possible for the Church today to imitate the ways of the early Christians? Give reason for your answer.​

Answers

Answer:

Explanation:

d president of the conventional signs of doing better Jim and I will be required to pay for the the best regards the team at eight in Hindi homework and always will be I am writing in response.

nd and always wanted to let you know that I have to know where to buy a dog's journey Krishna's mother told Krishna ki Jyoti ben phone number is this the best of all you .

X search you have to know where I send the pdf download and always wanted a dog's life is good for you have to be the height of the scale of pay the full u uruduhrhrhhryy and I will do I am not sure if it would be great if we can do in order for the the the the best friend house came in to see the attached the following.

good morning mam mam is not coming to an end to the basic premise that the age of empires III World of Warcraft accountand looked after bulb on the other even though it was in the morning of Saturday morning at that time of its initial and final and looked like tohhbfns.

à wear a dog's journey Krishna's mother told Krishna ki Jyoti of the conventional sign in the morning and looked like it so I will be required to pay for the whole.

like and follow.

Almost 99% of the Earth's atmosphere is made up of two gases. What ere the two gases and the percents of each?

Answers

Answer:

21% oxygen and 78%nitrogen

Explanation:

Answer:

Nitrogen and Oxygen

Explanation:

nitrogen - 78 %

oxygen - 21%

what is the ph of a peach with a [ –oh] = 3.2 × 10 –11 m?

Answers

Answer:

Amerigo Vespucci, was the first European to reach the Caribbean Islands.

Please select the best answer from the choices provided

T

F

Explanation:

Exhaling CO2 (Carbon Dioxide) is an example of what?
A-Excretion
B-movement
C- Nutrition
D- Reproduction

Answers

A. Excretion

(Word cap fill)

Summarize: Complete the following statements:
A. 1 mole of any element contains 6.0221 x 1023 _____
B. 1 mole of any compound contains 6.0221 x 1023 ______

Answers

Answer:

Explanation:

Taking into account the definition of Avogadro's Number, the correct answers are:

1 mole of any element contains 6.023×10²³ atoms

1 mole of any compound contains 6.023×10²³ molecules

You have to know that Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole.

Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression.

Avogadro's number applies to any substance, because the number of elementary units in a mole of a substance is, by definition, a  constant that does not depend on the material or the type of particle considered.

So, in this case, the correct answers are:

1 mole of any element contains 6.023×10²³ atoms

1 mole of any compound contains 6.023×10²³ molecules

hope that help you mark me as brinilylist pls

Oxygen-Carbon Dioxide Exchange
Place the statements in the correct
order.


1. heart pumps oxygen-
rich blood to the body
2. carbon dioxide moves
from bronchioles to bronchi
3. air moves through the
bronchi into the bronchioles
4. blood picks up carbon
dioxide from the body
5. INHALE
6. alveoli receive oxygen
to pass to blood
7. heart pumps carbon
dioxide rich blood to the
lungs
8. nose traps germs in air
9. oxygen passes into the
blood
10. air moves down the
trachea
11. alveoli receives carbon
dioxide from the blood
12. oxygen-rich blood flows to
the heart
13. carbon dioxide flows up
the trachea
14. EXHALE
15. carbon dioxide flows out
the nose and mouth

Answers

Answer:

Answer is below with the steps in order

Explanation:

4) Blood picks up carbon dioxide from the body

7) Heart pumps carbon dioxide rich blood to the lungs

8) Inhale

9) Nose traps germs in air

10) Air moves down the trachea

3) Air moves through bronchi into the bronchioles

6) Alveoli receive oxygen pass to blood

9) Oxygen passes into the blood

11) Alveoli receives carbon dioxide from the blood

12) Oxygen-rcih blood flows to the heart

3) Carbon Dioxide moves from bonchioles to bronchi

13)Carbon dioxide flows up

1) Heart pumps oxygen-rich blood to the body

The last four of five steps could be switched up a little bit since it all happens synchronously, but this is the most accurate interpretation.

The statements in the correct order are:

4) Blood picks up carbon dioxide from the body7) Heart pumps carbon dioxide-rich blood to the lungs8) Inhale9) Nose traps germs in the air10) Air moves down the trachea3) Air moves through bronchi into the bronchioles6) Alveoli receive oxygen pass to blood9) Oxygen passes into the blood11) Alveoli receives carbon dioxide from the blood12) Oxygen-rcih blood flows to the heart3) Carbon Dioxide moves from bonchioles to bronchi13)Carbon dioxide flows up1) Heart pumps oxygen-rich blood to the body.

Oxygen-Carbon Dioxide Exchange

The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.

Learn more about Oxygen-Carbon Dioxide Exchange here: brainly.com/question/18521401

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Complete the given equation and mention whether heat is absorbed or evolved during the chemical reaction.

NaOH + HCl ……………. + …………….

need help !! :) ​

no unwanted ans ...

Answers

Answer:

NaCI + H2O

this is answer

Make a super hero with the property of Science neutrons

Answers

Answer:

The poster should include:

 TITLE: Creative name of superhero.

 DESCRIPTION OF ELEMENT SUPERHERO (2 PARAGRAPHS):

This section should include a brief description of how your superhero acquired, used, or lived

with their element power. You may want to describe where does your superhero element lives

(where in nature can it be found). What are his/her superpowers? Does your superhero

element have a hideout? What are his/her strengths? What is his/her weakness? Who is

his/her arch nemesis (evil super villain)? What kind of super suit does your superhero have?

 5 FACTS:

This section should include at least 5 fun facts about your element. You can choose to

describe facts that illustrate where your element is found in nature. You may also wish to

describe what is your element used for. You may address what are characteristics of your

element or what are important uses of your element. For example, can your element be made

into something useful or can your element combine with other elements to make something

totally different.)

 ATOMIC DRAWING

Include the atomic structure of your element with correct labeling of its protons neutrons,

electrons. Make sure your drawing has the correct number of protons, neutrons, electrons.

 DRAWING OF YOUR ELEMENT SUPERHERO

This section should include a drawing (in color) of your Element Superhero on a clean sheet of

WHITE paper. You may want to draw your Element Superhero fighting his nemesis (super

villain). Or you may want to draw your Element Superhero using his special powers.Explanation:

(GIVING BRAINLIEST, 5 STARS , THANKS AND 20 POINTS NO LINKS PLEASE THIS IS MY LAST ASSUGNMENT TO PASS BECAUSE I HAVE A 78% PLEASE QUICK)

Jason completed an experiment and found the materials that conduct electricity and the materials that do not conduct electricity well. He made a table of his findings, but he made one mistake. Review his table, and choose the best answer that will correct the error in his table.


Conducts Electricity Does Not Conduct Electricity Well
Silver necklace
Rubber boot
Cast iron frying pan
Plastic cell phone case
Ceramic coffee cup
Glass cup

A. A rubber boot does not conduct electricity well, so it is in the wrong group.

B. A glass coffee cup conducts electricity well, so it is in the wrong group.

C. A plastic cell phone case conducts electricity well, so it is in the wrong group.

D. A cast iron frying pan does not conduct electricity well, so it is in the wrong group.

Answers

Answer:

A.) A rubber boot does not conduct electricity well, so it is in the wrong group.

Explanation:

A glass coffee cup conducts electricity well when it is heated

Answer:

i think the answer is a rubber boot if i am correct

Explanation:

A student makes an aqueous solution of sodium hydroxide. Which statement correctly identifies the two ions present in the solute of this mixture?
A. The sodium ion is positive, and the hydroxide ion is negative.
B. The sodium ion is neutral, and the hydroxide ion is neutral
C. The sodium ion is positive, and the hydroxide ion is positive.
D. The sodium ion is negative, and the hydroxide ion is positive.

Answers

Answer:

A. Na+ OH-

Explanation:

positive and negative ions form bonds because positive and negative attract

What is the mass number (A) of an atom that has an atomic number (Z=26) with 29 neutrons and 26 electrons?​

Answers

Answer:

A = 55

Explanation:

The atomic number is the number of protons also = the number of electrons, so basically we have 29 neutrons, 26 electrons and 26 protons. Anyway, it's asking the mass number which is the neutrons + the protons, so you just take 29+26 = 55

Atomic number=26

Neutrons=29

Electrons=26

Mass number=Proton+neutron

Protons=26

Mass number=26+29

=55

Other Questions
Stephanie ran four laps around the school track in 7 minutes and 30 seconds. How many seconds per lap is that? SOMEONE PLEASE HELPP!!!! New guidelines were recently published by the U.S. Department of Agriculture (USDA) to improve the way people eat. Recommendations include lowering salt intake, eating less sugar and saturated fats, and eating more fruits and vegetables. These guides have come out every 5 years, but though they are developed by reputable scientists, the public virtually ignores them. Countless studies have linked overeating and sedentary lives with multiple diseases and increased medical costs. Even with high-profile figures like Michelle Obama leading the fight for healthier lifestyles, the old habits die hard. The need to shift to healthier eating is more urgent now than ever. Weight problems are epidemics in the United States, as is the equally pressing problem of undernourishment. For example, people today eat far too much salt. This salt addiction has been proven to increase the risk for heart disease and stroke, as well as other costly and life-threatening illnesses. The new guidelines give specific recommendations regarding how much daily salt is healthy. However, it's doubtful whether Americans will heed the advice. They'd rather watch cable TV and eat French fries than make changes that would likely prolong their lives. Thankfully, the USDA has become proactive in changing the way we Americans eat. Most people are familiar with the famous food pyramid the agency developed years ago, showing the food groups and servings of each group. However, the agency's guidelines go far beyond the colorful posters hanging in schools across the nation. School meal programs are impacted by the document, as are decisions about the labeling of foods and how foods are marketed to young people. In particular, by using the guidelines to target school breakfast and lunch programs, the USDA hopes to make healthy foods an easy alternative for kids. Clearly, adults cannot be counted on to make healthy eating a priority. With the USDA's help, school kids will get started early on a lifetime of good diet habits.The author of this selection feels A. that Americans don't want to change their eating habits. B. that breakfast is the most important meal of the day. C. that people will wise up and start following the USDA guide. D. that kids will reject the healthy school lunch options. Which of the following causes the change from day to night? A company's environmental sustainability strategy: ____________ a. is incompatible with the triple-bottom-line approach because it does not take into account people and profits. b. always takes a back seat to strategies designed to improve a company's standing in the marketplace.c. entails business practices that meet the needs of the future by rationing what is provided to present-day customers. d. has a strong historical correlation with increases in the well-being of the environment and economic growth. e. consists of a company's actions to protect the environment, provide for the longevity of natural resources, and maintain ecological support systems for future generations. Which expression is equivalent to 440d2 - 176d? There is 5 questions I have: 1. When borrowing money from citizens during the American Revolution, the government issued bonds. What are bonds and why are they important?2. Alexander Hamilton wanted Congress to create a national bank___the Bank of the United States. What would this bank do?3. Do you think tariffs are good or bad for a country, explain?4.What was the Northwest Territory and why was it important after the American Revolution? 5. Britain and France went to war in 1793, which caused Washington to issue the Proclamation of Neutrality. What is the Proclamation of Neutrality and why was it important?30 points. Please quickly do number 12 & 13 I'll give brainliest. Answer asap! Need help before I go to sleep. aWhat is the image of the point (-9, -6) after a rotation of 90 tounterclockwiseabout the origin? SOLVE x + 3y = -1y = x - 7Write the solution below. The ratio of the interior angle measures of a triangle is 2:3:5. What are the angle measures?In order from the smallest angle to the largest angle, the angle measures are __, __, and __.Show all steps. Which forest biome has year-roundprecipitation in many forms, is verydiverse with deciduous trees,flowering trees, and shrubs, andabundant growth in spring?A. Temperate forestB. Coniferous forestC. Tropical rainforestD. Tropical dry forest Match each type of fossil to the description that best matches. What is the inkiphalin command? (X+2)(x+6)=0 In the problem shown, to conclude that x + 2 = 0 or x + 6 = 0, one must use the: o zero product property O division property O transitive property O multiplication property Why did Scrooge walk through all his rooms to see if everything was alright? please help asap rn thank you why is ela an important subject? The cost of an anti-virus software package is $65 for the first year and $10 for each annual renewal. If the independent variable is the number of annual renewals and the dependent variable is the total amount paid, what is the slope and y-intercept of the graph of the equation representing this situation? what is the justifications for keeping the Philippines