Chemistry High School

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

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

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.

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

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

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

Answers

Answer:

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

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...

Plz help it’s for chemistry!!

Answers

Answer:

Oxygen is negative charge

Explanation:

And The 2 Hydrogens are positive charges

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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Ethanoic acid is a weak acid because

Is a carboxylic acid
Does not irritate the skin
Is not completely ionized in water
Produces one hydrogen ion per molecule

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.

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:ultraviolet rays

Explanation:

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:

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

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.

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.

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.

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.

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

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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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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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

mmmmmmmmmmmmmtyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Answers

Answer:

Yes.

Explanation:

Answer:

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

Explanation:

can i have Brainliest i need 1 more

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.

Determine the mass of 10g of CaCO3

Answers

Answer:

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

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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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.

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

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.

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.

Other Questions

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