Chemistry High School

PLEASE HELP ASAP!!!! (60 POINTS)

Answers

Answer 1

Answer:

copy and paste here ill do it

Related Questions

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

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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 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 helium an example of?
element
compound
atomic number
subatomic particle

Answers

I believe its element.

Answer:I believe it is Subatomic Particle.

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

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Answer:

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

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

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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

mmmmmmmmmmmmmtyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Answers

Answer:

Yes.

Explanation:

Answer:

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

Explanation:

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

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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.

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

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Answer:ultraviolet rays

Explanation:

whats valency of nitrogen in N2O3, N2O5 and NO

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Answer:

Valency of nitrogen in the given compounds:

N₂O₃ = +3

N₂O₅ = +5

NO = +2

-TheUnknownScientist 72

tijuan mixed a solid and a liquid together in a beaker

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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

The temperature of a gas is increased. Which statement best explains the effect that this has on the motion of gas
particles?

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Answer:

The average kinetic energy increases, and the particles collide more frequently.

Explanation:

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.

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:

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 does the energy of a hurricane come from? (1 point)
O the Sun
O strong winds
O Earth's spin
O Earth's moon

Answers

Answer:

strong winds come from the energy of a hurricane

The energy of a hurricane come from strong wind. The Taino Native American term hurricane, which translates to "bad spirit of the wind," is where the word hurricane originates.

What is hurricane ?

A tropical storm that has sustained winds of 74 mph or greater is referred regarded as a hurricane. A storm's eye typically measures 20 to 30 miles in width and can reach distances of 400 miles. Storms can be dangerous because of their torrential downpours, strong gusts, and storm surges.

When warm, humid air begins to rise over water, hurricanes emerge. Cooler air replaces the rising air. Large clouds and thunderstorms continue to grow as a result of this process. Thanks to the earth's Coriolis Effect, these thunderstorms are still expanding and starting to rotate.

Thus, option B is correct.

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Why are being flammable and combustible considered to be chemical properties and not physical properties?
A. They alter its mass and volume
B. They change the state of matter
C. They change the substance into another substance
D. They change the color of the substance

Answers

Answer:

C. They change the substance into another substance.

Explanation:

Hope it helps!!

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

I believe that A is the answer

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.

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

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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.

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.

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

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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 many elements belong to the alkali metal family

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Answer:

six

Explanation:

check your periodic table

could you help answer these two question

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Answer:

number 29 is D

Explanation: When the moon orbits the earth some of the light reflects off the moon, making it visible on the Earth.

I dont know how to answer 28 fully, is there a picture?

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

What fraction of the original atoms of the radioactive sample will remain after the given number of half-lives has passed?

Answers

Answer:

1/8

Explanation:

[tex] \frac{1}{ {2}^{3} } = \frac{1}{8} [/tex]

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I need help with this

Answers

Answer:

129 units cubed

Explanation:

There are ten spaces between 120 and 130, so we can infer that each line represents a change in volume of 1 unit. The volume of the substance in the graduated cylinder looks like it's 1 under 130, so its volume is 129 units.

Hopefully this was helpful! :)

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.

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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Other Questions

-0.75___-3/4which one is greater what is the only artery that does not carry oxygenated blood? what is 1/3 divided by 1/9 Part B Write a clear, five-sentence body paragraph. Remember that your body paragraph should support the main idea of your introductory paragraph. Use the outline you created for reference. THIS IS URGENT! NO CHEATING PLEASE!What are four causes of the Agrarian Revolution? Lucys family had recently moved. She was extremely nervous about her first day at her new school. She tended to be shy and frightened around new people. As a result, she was never truly able to make real friends. She dreaded that this would happen in her new school. On her first day, her teacher introduced her to the class and assigned her a seat. All the unfamiliar faces made Lucy nervous. To calm herself, she focused on looking out the window.Lucy, what is the right answer to the question? she suddenly heard her teacher ask.Lucy jumped in surprise. Every single eye was on her. She had not heard the question but was too embarrassed to admit it. Im sorry, Mrs. Slate, she muttered. I dont know the answer. A few students giggled at her response. That only made Lucy feel worse. She looked down at her desk, fearing that she would burst into tears.When recess came, Lucy thought she would spend some time alone in the classroom. All the other students left the room except for one boy. He sat alone and looked rather glum.I wonder whats wrong with him, Lucy thought to herself. It occurred to her that she should talk to the boy. Im tired of being afraid of people, she thought. Its time to change that.Gathering her courage, she walked up to the boy and quietly introduced herself. The boy responded with a bright smile. After speaking to him, Lucy found out that the boys best friend had recently left the school. Now he had no friends. Lucy offered to be his new friend. The two became great friends, and Lucy was proud of herself for stepping out of her comfort zone to talk to him.A. doing challenging things can be rewarding B. nervous and shy people can never make friendsC. a student has to be confident in front of classmatesD. teachers are the kindest people at school Imagine that you are an ecologist who must determine whether an entirebiome is being threatened by human activity. What might you look for in anindicator species?A. Will likely be affected first if any part of the ecosystems aredegradedB. The species carved on rocks and other ancient bearers of artC. A species of economic importanceD. The most well-known species, which is likely to be depicted onmoney and postcards What are two ways that deforestation contributes to air pollution? What causes your heart rate, respiration and blood pressure to increase?Nicotine increases the release of _______________.What is dopamine?You can build up a tolerance to nicotine. True or false NEED HELP!PLEAE WITH CHEMISTRY! 27 dived ( 3 + 6 ) x 5 - 12 Fill in the blank our foal and _____ are most at risk 3(6x+2) What is the meaning of diversified? _______________ theorized that 200 million years ago Earths continents were connected as a supercontinent called Pangaea.A) Harry HessB) George CouvierC) Alfred WegenerD) James Ussher What is the coefficient of the first term in this expression?4r+q3r2+8q2r Find m breathing involves the movement of diaphragm and Rib cagetrue or false A cylinder with a movable piston contains a sample of gas having a volume of 6.0 liters at 293 K and 1.0 atmosphere. What is the volume of the sample after the gas is heated to 303 K, while the pressure is held at 1.0 atm? *0 points9.0 L6.2 L5.8 L4.0 L whats the answer pls can any body say.....