What occurs as potassium nitrate is dissolved in a beaker of water, indicating that the process is endothermic?

(1) The temperature of the solution
decreases because heat was
released.

(2) The temperature of the solution increases because heat was absorbed.

(3) The solution changes color.

(4) The solution gives off a gas.

Answers

Answer 1

(1) The temperature of the solution decreases because heat was released.

Related Questions

Carbon tetrachlordie (CCI4) is ___

A. iconic

B. Covalent

Answers

B) covalent

Why? Because Carbon is a non-metal, and Chlorine is a non-metal. Two non-metal elements make a covalent or molecular compound.

mmmmmmmmmmmmmtyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Answers

Answer:

Yes.

Explanation:

Answer:

=0=0==00=0=0=

Explanation:

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SnO is a different compound than SnO2. What is the difference regarding the cation?

Answers

Answer:

Sn has a different charge in each of the compounds.

+2, +4 charges, respectively.

Explanation:

SnO has subscripts of 1, which means it takes only one of each element to make the compound.

We know that oxygen's charge is -2 from the periodic table.

In order for the compound to be neutrally charged,

Sn + O = 0

Sn - 2 = 0.

So, Sn has a +2 charge.

Likewise with the second compound, we know O has a -2 charge.

Sn + 2*(-2) = 0

Sn - 4 = 0

Sn = +4

+2 and +4 are different charges on the Sn cation.

what is the wavelength of radio waves that have a frequency of 3.20 x 1010 hz?

Answers

Answer:9.38 x 10^−3 m

Explanation:

Answer: 9.38 x 10^−3 m

Explanation:

what are the basic postulates of kinetic molecular theory?

Answers

Answer:

Five Postulates of KMT.

Gas particles travel in straight lines unless they collide with other particles or the walls of the container.

Gas particles have negligible volume compared to the free space between them..

Molecular collisions are perfectly elastic and kinetic energy is conserved.

Gas particles experience negligible intermolecular forces, there are no attractive or repulsive forces between particles.

The average kinetic energy of the particles in a sample of gas is proportional to the absolute temperature.

The fifth postulate is very important to note as it relates kinetic energy to temperature.

For a gaseous particle most of the kinetic energy is in translation.

10 What is a characteristic of all living organisms?
A breathing
Begestion
C
excretion
D ingestion

Answers

Answer:

D - ingestion

Explanation:

b. not ingestion, as plants are living but do not ingest.

Which item is a good example of potential energy?
A thrown baseball
O Electricity
O A rock
A battery

Answers

A rock because it is stationary

What is the most common injury caused by working with machines unsafely?

Answers

Answer:

The most common injury caused by working with machinery are cuts and burns.

Explanation:

Cuts and burns are the most common injury caused by working with machines unsafely.

What is injury?

Any physiological harm to living tissue brought on by acute physical stress is referred to as an injury. An injury can be brought on by a blunt trauma, a piercing trauma, burning, exposure to chemicals, asphyxiation, or overexertion, and it can also happen accidentally. Any area of the body can become injured, and each injury has a unique set of symptoms.

Major injuries are normally treated by a medical practitioner, and the type of treatment depends considerably on the injury. The most frequent reason for accidental human injury or injury-related death is traffic crashes. Chronic conditions are different from injuries. Cuts and burns are the most common injury caused by working with machines unsafely.

Therefore, Cuts and burns are the most common injury caused by working with machines unsafely.

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Which of the cells is flat and protects you?

Answers

Answer:

Skin cells are flat and protect you!

Explanation:

Answer:

Epithelial cells are the safety shields of the body. Take another look at your hand. It is covered with epithelial cells that protect your body by being a barrier between your internal cells and the dirt and microbes in the environment.

Which definition bests describes an hydrogen bond?
(a) A bond between an highly electronegative element and hydrogen
b.A bond between two non-metals
c.A bond between a metal and a non-metal
d.A bond involving sharing of electrons

Answers

I believe that A is the answer

Determine the mass of 10g of CaCO3

Answers

Answer:

= 100u. Hence 10 g = 0.1 mole. Hope it's helpful to u

Explain why the invention of the microscope led to the discovery of cells.

Answers

Answer:

Because people can now see microscopic items

Explanation:

People can now see the cells because they are so small we cant see them with the enhanced microscope we can see everything that's micro

Plz help it’s for chemistry!!

Answers

Answer:

Oxygen is negative charge

Explanation:

And The 2 Hydrogens are positive charges

What is the molarity of 6 moles (mol) of NaCl dissolved in 2 L of water?
O A.
2 mol
6L
ОВ.
6L
2 mol
O c.
6 mol
2L
O D.
2L
6 mol

Answers

Answer:

C: [tex]\frac{6 mol}{2 L}[/tex]

Explanation:

we can use the molarity equation

[tex]M = \frac{mol}{L}[/tex]

so to find M we plug in what we know, which is 6 moles of NaCl and 2 L of water, which gives us:

[tex]\frac{6 mol}{2 L}[/tex]

Answer:6 mol/2L

Explanation:just took the quiz

the properties of a substance that can be observed without altering its identify physical property. true false ?

Answers

Answer:

True

Explanation:

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points.

how is a standard hydrogen atom different from a hydrogen ion?

Answers

Answer:

a hydrogen ion will have more or fewer electrons than a standard hydrogen atom.

Explanation:

ions are atoms that have lost or gained elections. this applies to ions in general.

whats valency of nitrogen in N2O3, N2O5 and NO

Answers

Answer:

Valency of nitrogen in the given compounds:

N₂O₃ = +3

N₂O₅ = +5

NO = +2

-TheUnknownScientist 72

Which of the following is matter in its solid form?
O Air
O Electricity
O Rock
O Water

Answers

Water
It can be a solid or a liquid

Where is a alcohol thermometer used?

Answers

Explanation:

Ethanol-filled thermometers are used in preference to mercury for meteorological measurements of minimum temperatures and can be used down to −70 °C (−94 °F). The physical limitation of the ability of a thermometer to measure low temperature is the freezing point of the liquid used.

tijuan mixed a solid and a liquid together in a beaker

Answers

Tijuan mixed a solid and a liquid together in a beaker. He determined that a chemical change occurred. ... After a week, he observed that only solid salt remained in the cup and the mass had decreased I hope this helped! In some way

Mike mixes two chemicals in a container. The container quickly becomes very hot.

What can be said about this reaction?

Answers

the chemicals are reactive with one another

Answer:

It is a exothermic reaction.

Explanation:

Exothermic reactions release energy to their surroundings.

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Carbon monoxide (CO), carbon dioxide (CO2) and nitrogen dioxide (NO2) are low molecular weight covalent compounds. Which of the following best describes the state in which these compounds exist at Standard Temperature and Pressure (STP)?

solid

liquid

gas

plasma

Answers

Answer:

gas

Explanation:

at Standard Temperature and Pressure Carbon monoxide (CO), carbon dioxide (CO2) and nitrogen dioxide (NO2) exist as gases

Option C is correct

Low molecular weight covalent compounds

Covalent compounds are compounds that are characterized by strong Intra-molecular bonds and they are solids as they have higher molecular weights

But when compounds like Carbon monoxide (CO), carbon dioxide (CO2), and nitrogen dioxide (NO2) are formed with low molecular weight covalent bonds They exist as gases

Answers

Answer:

is not completely ionized in water

The ethanoic acid (acetic acid) is considered as a weak acid because it does not releases all of its hydrogen in water, rather it dissociates partially and establishes an equilibrium with its conjugate base.

rays with short wavelengths that are the least penetrating, produce chemical effects, and kill germs are

Answers

Answer:ultraviolet rays

Explanation:

covalent bond of N and S

Answers

Answer:

Covalent bond between identical atoms

Covalent bonds occur between identical atoms or between different atoms whose difference in electronegativity is insufficient to allow transfer of electrons to form ions. ... The two hydrogen atoms are attracted to the same pair of electrons in the covalent bond.

In a compound, chemical energy is _______________ when bonds break.

Answers

Answer:

In a compound, chemical energy is _____required__________ when bonds break.

In making a pizza, which process involves a chemical
change?
o mixing spices for the sauce
o slicing pepperoni for the topping
o spreading cheese on the pizza
o baking the dough to form the crust

Answers

Answer:

baking the dough to form the crust

In making a pizza, the process that involves a chemical change is baking the dough to form the crust.

What is chemical change?

Chemical changes occur when a substance combines with another to form an entirely new substance.

During a chemical change there is a formation of an entirely new product different from the original product.

Thus, In making a pizza, the process that involves a chemical change is baking the dough to form the crust.

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assuming that no heat is lost to the surroundings, what is the final temperature of the mixture?

Answers

Well this should be pretty straightforward. If energy isn’t wasted then it should be the same temperature that you started with.
Conservation of energy says that energy cannot be created or destroyed, only transferred from one store to another.

The number 1x10^100 is called a googol. Write the number 50 googols in standard form.

Answers

Answer:

Explanation:

50 * 10^100 is 50 googols in scientific notation... but

come on, who would write that in standard form...

An atom's Lewis dot structure has three dots. Which of the following elements could it be, and why? (4 points)

Group of answer choices

Aluminum, because it is in group 13 and has three valence electrons.

Lithium, because it is a group 1 element with three total electrons.

Magnesium, because it is in period 3 and has three valence electrons.

Potassium, because it is an alkali metal and has three inner shell electrons.

Answers

Answer:

Aluminum, because it is in group 13 and has three valence electrons.

The formation of molecule can easily be shown by drawing Lewis dot structure. Since atom's Lewis dot structure has three dots. So Option A is correct option.

What is Lewis dot structure?

Lewis dot structure is a way to represent the valence electron of an element in the form of dot. These are mainly beneficial in understanding the chemical formula of covalent compound.

It is given that the Lewis dot structure of molecule contain only 3 electron. That means that element contains 3 electrons in its valence shell.

Aluminum's electronic configuration is 2,8,3

Lithium's electronic configuration is 2,1

Magnesium's has electronic configuration as 2,8,2

Potassium's electronic configuration is 2,8,8,1

Thus Aluminum is the only element that has 3 electron in its outermost shell So, Option A is correct option

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Sugar 2C6H1206 total number of atoms * _____ is a trauma and stressor-related disorder that is triggered by exposure to a catastrophic or horrifying event that posed serious harm or threat to that person. HELP PLZ!Using the evidence below, which of the following instances of elaboration does the best job of explaining why the evidence supports that video games cause negative health impacts related to physical strain.Evidence: Dr. Matthew Edlund, director of the Center for Circadian Medicine and author of "The Power of Rest" says, "Teens need adequate deep sleep and REM sleep to rebuild long-term memory for learning, focus attention for driving and maintain health and fight obesity ... They're so connected to their machines that they're treating themselves as though they don't need any rest" (Ortiz Healy).Question 3 options:This proves that video games cause negative health impacts.Because of this tendency for teens to forgo sleep in order to play video games, the physical strain placed on the body by the lack of sleep results in negative health impacts. Negative health impacts due to physical strain result when teens decide not to sleep in order to play video games.Sleep is good, and teens need to be sure to get enough of it. Margo has a daily income of $60, which she can spend on coffee or bagels. Each cup of coffee costs $3 and each bagel costs $4. She is currently spending all her income, and she is willing to forgo 1 bagel to get the next cup of coffee to achieve the same level of utility. To maximize her utility, she should:_______.a. increase bagel consumption and decrease coffee consumption b. decrease both consumption of coffee and bagel c. do nothing d. increase coffee consumption and decrease bagel consumption Who answer this right gets 10 pts! Cmo se le llama a los personajes que aparecen ocasionalmente en una historia Which equation has a solution of r = 1/3 Help plsHelp plsHelp pls Hey everyone! This questions is tricky for me so can anybody help me out? I would be very grateful if you can! what part of the eye lets us see colors and clear, sharp images with a lot of small details. They need bright, strong light. All of the following can help preventsunburn, with the exception ofwhich?A. being in cool water, such as a swimming poolB. applying sunscreen oftenC. covering your skin with sleeves or other clothing An object is thrown upwards with a velocity of 15 m/s. How long will the ball take to reach its starting point ? Refutation to why parents should restrict students internet usage.(Not copypasted from internet) President Obama stated that the france was our first ally true or false I will mark brainlist please helpStory : A Dogs Tale by Mark Twain1. Using a dog as narrator gives the passage a tone of objectivity formality bitterness humor2. What literary device is used in the sentence She had one word which she always kept on hand, and ready, like a life-preserver? Simile Metaphor Hyperbole Onomatopoeia3. Based on the second paragraph, the word mastiff most likely means a large dog a male dog a mans shirt a part of a ship4. According to the author, what would bring such happiness to the dogs as he describes at the end of the story? They helped the authors mother find the words she used, so they especially enjoyed watching her use them. They knew the meaning of supererogation and realized they were listening to a funny joke. Watching and laughing as others were embarrassed vindicated their own previous embarrassment. They were generally happy dogs who often expressed a great deal of joy.5. A Dogs Tale uses the topic of animal communication in order to show how dogs really communicate explain how animals learn from humans demonstrate that dogs are smarter than most people poke fun at human behavior6. The amount of time that passes during this story is most likely 10 hours 10 days 10 months 10 years7. An underlying theme in this story is that many people use words without knowing their meanings dogs know more than people realize family loyalty takes top priority strangers are almost always suspicious8. Since the author used first person, readers are left to wonder how the author felt about his mother how strangers reacted to his mothers word knowledge what the authors mother was thinking whether or not the authors mother knew the meanings of all the words she used Properties of nonmetals includea.high boiling point.b.ability to conduct heat.c.dull appearance.d.none of the above x. y-1. 20 42 84 12This table shows a linear relationship.The slope of the line is ? How did Malala Yousafzai show self reliance? Find the l.c.m of 200 and 45 find the equation of a line , in Slope intercept Form , that has a slope of 3 and passes through the point (-4,2).