Chemistry High School

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Answers

Answer 1

Answer:

gAIN

Explanation:

Related Questions

Which elements have similar behavior? barium silicon aluminum strontium osmium beryllium

Answers

Answer:

Barium, beryllium, and Strontium

Explanation:

These 3 elements are located in the same group, which determines the number of valence electrons.

The valence electrons determine how reactive an element will be.

A. →barium

B. silicon

C. aluminum

D. →strontium

E.osmium

F. →beryllium

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How many moles are present in 5.24 x 1023 molecules of CH4?

Answers

I hope this helps. I am in a lower grade than you, I am assuming, but I wanted to help you

Answer:

Explanation:

Explain why a lithium ion (Li+) is smaller than a lithium atom (Li).

Answers

Li+ lost an electron, meaning it got more positive, but also smaller

Answer:

Lithium ions are smaller than lithium atoms. This is because the lithium atom has 2 shells, while the ion just has one shell. Bromide ions are larger than bromine atoms, due to increased inter-electronic respulsion.

Explanation:

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How do scientists determine whether a chemical reaction releases or stores energy

Answers

Scientists calculate the bond energies of the reactants and products
Scientists compare the total bond energies of the reactants and products

Explain what an air mass is?

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yedsdfsdfdsfsdfsd f sdf ssdf sdfsdf sd fsdf sd

Explanation:

Answer:

A body of air with horizontally uniform temperature, humidity, and pressure.

Explanation:

hope this helped :)

Please help solve this question correctly, thanks :)

Answers

Answer: what question?

Explanation:

Answer:

theirs no question

Explanation:

no question or picture

Which orbital can be modeled by a "peanut" shape?

Answers

Answer:

d - orbital

Explanation:

The d-orbital can modelled by a peanut shape.

A peanut shape closely resembles the shape of a double dumb-bell shape. The double dumb-bell shape is like that of a peanut.

The s-orbital has a spherical shape. p - orbital is dumb-bell shapedd - orbital is a double dumbellf - orbital has a complex shape.

Therefore, since a peanut is like a double dumb-bell, it clearly models the d-orbital.

what does "8 is great" mean as it pertains to valence electrons?

Answers

Answer:

stability and completely filled orbitals

Explanation:

As it pertains to valence electrons, "8 is great" means the valence electrons present in the orbital confers stability on the atom as the shell becomes completely filled.

For an atom to be stable, it must have completely filled outer orbitals. The number of electrons required is usually 8. This is the octet number which confers special stability on an atomic configuration. Elements having this number of electrons in their outer shell are unreactive.

describe the whole process of Aluminum extraction from bauxite.

Answers

Answer:

Extraction of aluminium

Aluminium ore is called bauxite . The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted. The extraction is done by electrolysis. The ions in the aluminium oxide must be free to move so that electricity can pass through it.

Answer:

The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted. The extraction is done by electrolysis. The ions in the aluminium oxide must be free to move so that electricity can pass through it.

I know I am a little late answering this but I still wanted to answer the question for you . I am not good at explaining things so I copied and pasted but I hope this helps.

How many molecules are present in 3.09 mol of silicon dioxide, SiO2

Answers

There are 1.86 x 10²⁴ molecules of Silicon dioxide, SiO₂

Further explanation

The mole is the number of particles(molecules, atoms, ions) contained in a substance

Moles can also be determined from the amount of substance mass and its molar mass

1 mol = 6.02.10²³ particles

Can be formulated

[tex]\tt \boxed{\bold{N=n\times No}}[/tex]

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

Given

3.09 mol of Silicon dioxide, SiO₂

n=mol=3.09

Number of molecules :

[tex]\tt N=n\times No\\\\N=3.09\times 6.02\times 10^{23}\\\\N=\boxed{\bold{1.86\times 10^{24}~molecules}}}[/tex]

An unknown substance kept in a sealed container at room temperature has a pressure of 2 atm. When the container was opened, the substance was exposed to normal atmospheric pressure, 1 atm. Which change did the substance most likely undergo?

Neither the temperature nor the volume will change.

The volume will decrease.

The volume will increase.

The temperature will increase.

Answers

Answer:

I took the test it's C.The volume will increase.

Explanation:

Since the pressure went down from 2 atm to 1 atm, the volume will go up! They are inversely related.

The change that the substance most likely underwent is that the volume will increase.

BOYLE'S LAW:

The relationship between the volume of a gas and its pressure is explained by Boyle's law.

Boyle's law states that the volume is inversely proportional to the pressure of a given gas. This means that as the pressure of a gas increases, its volume also increases and vice versa.

According to this question, an unknown substance kept in a sealed container at room temperature and a pressure of 2 atm changed to normal atmospheric pressure (1 atm).

This depicts that the volume of the gas increased since the atmospheric pressure decreased.

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Answers

Answer:

B. Aluminum has layers of electrons that can slide over one another.

14)
Air can be considered a mixture. Which statement helps describe air?
A) Air contains a fixed ratio of atoms.
B) The components of air separate into visible layers.
C) The components of air can be separated by chemical means.
D) The exact mixture of components varies from point to point.

Answers

Answer:

the components of air can be separated by chemical means

Answer:

D) The exact mixture of components varies from point to point.

Explanation:

Here's why: Air can be considered a homogeneous mixture.The exact mixture of components varies from point to point. Air is made up of individual elements and compounds. When near a cow pasture, you can smell the compounds associated with cow patties but you can not see these as separate from the rest of the air

The burning gases of the sun are matter in the gaseous state, whereas the ground you walk on is matter in the ___________state.

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Answer:plasma

Explanation:

what bond is a sea of free flowing electrons

Answers

Answer:

metallic bonds

Explanation:

in metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions.

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In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions. (THIS WAS LOOKED UP, SO DONT COPY AND PASTE OR YOUR TEACHERS WILL THINK YOUR CHEATING. GIVE THE OTHER PERSON BRAINLY, Hope this helps!)

Just need help with these 2 problems

Answers

Answer:

All of the above

A person lifts up a box from the ground and places it on a shelf

Explanation:

Work done is the force applied on a body to move it through a particular distance or to cause displacement.

In describing work done:

Force applied which is the push or pull on a body is very important

Distance or displacement which is the resultant length of path traveled by the body is key.

Work done = force x distance moved in the direction of the force

A person lifting a box is doing work.

The mass of a bowling ball is 5 kilograms what is the mass of a bowling ball in grams?

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In science, the standard unit of mass is the kilogram (kg). A bowling ball has a mass of about 5 kilograms. A basketball has a mass of just over 0.5 kilogram. The mass of a basketball can easily be given in smaller units—grams.

The mass of the bowling ball in grams is 5000g

What is the mass of a bowling ball in grams?

To convert the mass of a bowling ball from kilograms to grams, you can multiply the mass in kilograms by 1000, as there are 1000 grams in one kilogram.

Using metric system;

So, the mass of a 5-kilogram bowling ball in grams would be:

5 kilograms * 1000 grams/kilogram = 5000 grams

Therefore, the mass of a 5-kilogram bowling ball is 5000 grams.

Learn more on metric system here;

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A part of the periodic table is shown
11
Na
19
K
37
Rb
12
Mg
20
Ca
38
Sr
Which of the following elements has the highest atomic mass (amu)?

a Sodium (Na)
b Calcium (Ca)
c Strontium (Sr)
d Potassium (K)

Answers

Answer:

Explanation:

Atoms of Oxygen-16, Oxygen-17 and Oxygen-18 have the same number of _________________?

Answers

Answer:

Atomic number or number of protons

Explanation:

The given species are all isotopes of oxygen. Isotopes have the same number of protons or atomic number. They only differ in the number of neutrons.

Isotopy is the existence of two or more atoms of the same elements having the same atomic number but different mass number. The different mass number is due to differences in their number of neutrons. Isotopes have the same electronic configuration and hence, they have the same chemical properties. Isotopes only differ in their masses.

20 PTS!!! Jack said that unprocessed oil is a mixture of many organic compounds. Jane said that unprocessed oil needs to be processed so that individual compound can be isolated. Who made the correct statement and why?

1. Jack is correct, unprocessed oil is a mixture of many organic compounds. Jane is not correct, they do not need to be processed to be used.
2. Jack is incorrect, unprocessed oil is not a mixture of many organic compounds. Jane is correct, unprocessed oil needs to be processed to be used.
3. Both Jack and Jane are correct. Unprocessed oil, petroleum, is a mixture of organic compounds that need to be isolated or separated to be used.
4. Neither Jack nor Jane are correct. Unprocessed oil, petroleum, is not a mixture of organic compounds and it does not need to be isolated or separated to be used.

Answers

Answer:

Explanation:

i am thinking 3 and 2 but i am gonna say it is 2

98.654321%

Answer:

Both Jack and Jane are correct. Unprocessed oil, petroleum, is a mixture of organic compounds that need to be isolated or separated to be used.

Explanation:

Increasing the temperature of a gas mixture will decrease the kinetic energy of the gas particles.

Answers

Answer:

False

Explanation:

From what I know about water and gas, this is false

what does WHMIS mean?

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Answer:

Workplace Hazardous Materials Information System

WHMIS is a short form for Workplace Hazardous Materials Information System. It is a comprehensive plan for providing information on the safe use of hazardous materials used in Canadian workplaces. Information is provided by means of product labels, material safety data sheets (MSDS) and worker education programs.

Answer:

Workplace Hazardous Materials Information System

Explanation:

a sample that has a half life of 45 years take ____ for the count rate to drop from 600 cpm to 150 cpm

Answers

Answer:

90yrs

Explanation:

Half life is the time taken for half of an original radioactive material to decay by half.

For the sample;

Half - life = 45yrs

Original amount = 600cpm

Start Number of atoms

0yrs 600cpm

First half life

45yrs 300cpm

Second half life

90yrs 150cpm

Tin-126 has a half life of 100,000 years. How many years does it take to
reduce 100 g of Tin-126 to 12.5 g?
100,000 years
200,000 years
50,000 years
300,000 years

Answers

Answer:

300,000 years

Explanation:

100g=0 years

50g=100,00 years

25g=200,00 years

12.5g=300,000 years

300’000 yes I think she is correct

Help quickly please, actual answer

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Answer:

the answer is d i think probably of the format of that place of the only on to 9 so its d

Finding the mass of a bar of aluminum is 25 grams is it hypothesis observation inference or guess

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Answer:

It is a observation

Explanation:

Which salt would HI and NH4OH produce?

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The salt is (NH4)NO3

How are chemicals used to produce colors in fireworks?

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Answer:

The colors are produced by heating metal salts, such as calcium chloride or sodium nitrate, that emit characteristic colors. List of colors and elements in Fireworks: Aluminum – Aluminum is used to produce silver and white flames and sparks.

Which characteristic applies to all mixtures, including solutions?
a) Mixtures must be composed of compounds.
b)Mixtures are composed of a single element.
c)Mixtures are composed of two or more substances.
d)Mixtures have uniform structures throughout entire samples.

Answers

Answer:

c)Mixtures are composed of two or more substances.

Explanation:

From the given choices, it is true that mixtures are composed of two or more substances.

Mixtures have indefinite composition i.e. they consist of two or more compounds in any proportion by mass.Constituents retain their identity. The constituents reacts differently to changed conditions. They can easily be separated into constituents.

=
1.10
Which procedure involves a physical change in one of the substances?
O creating salt by reacting sodium metal and chlorine gas
O grinding chalk into a fine powder
o building a model rocket propelled by mixing baking soda and vinegar
O allowing a nail to rust

Answers

Answer:

Grinidng chalk into a fine powder

Explanation:

The answer is C.) Grinding Chalk into a fine powder because as you can see from the others, the words REACTING, MIXING, and anything dealing with rust, is a result of a chemical change happening. Grinding chalk is not changing the fact that it is chalk, all it is doing is changing its physical shape. I hope you found this helpful have a good night!

Other Questions

You are building a house of cards. Explain how you know if the forcesacting on the cards are not balanced What is natural selection and what are ifs effects on allele frequencies PLSSSSSS HELP!!!!!!!!!!! FIRST AWNSER GETS BRAINLIEST!!!!!!!!!!!!!!!!!!!Compulsive HoardingWhat Is a Hoarder?A hoarder is a person who accumulates objects and keeps them for future use. Most people like to collect a thing or two of sentimental value. Some collect photographs, stamps, books, movies, or music. However, some people hoard excessively. According to psychologist David Tolin, two to five percent of Americans may meet the criteria for being compulsive hoarders. The problem is more common than people may think.The Reasons for HoardingCompulsive hoarders have a difficult time getting rid of items that the average person considers to be trash. Hoarders find their possessions, even objects such as junk mail, too valuable. They become attached to certain objects and have trouble letting go of them. Hoarders also assume that things most people easily throw away might be useful someday. Thus, hoarders become a burden to both their families and communities. They can even pose serious health risks to themselves and others.The Problems with HoardingCompulsive hoarding is problematic because hoarders are unable to function like regular people. Collecting too much stuff can leave little space for cooking, cleaning, getting around, and even sleeping. The vermin and mold that gather around the hoarded material pose health risks. However, the worst problem that hoarders have to face is dealing with family members and friends. Family members and friends often do not know how to help hoarders. As a result, many of these relationships are strained.The Help Hoarders NeedMost hoarders do not see their unusual behavior as a serious problem. Because hoarders see nothing wrong with their behavior, they rarely seek help. Often, disgruntled family members attempt to help and seek assistance for the hoarders. Because hoarding is a serious problem, the help needed to break the habit needs to be substantial. Hoarders need help to understand that their collections are simply clutter and often a health risk. They need to understand that trash, like a used Band-Aid, should carry no sentimental value and is not worth keeping.Under the heading "What Is a Hoarder?," why does the author include information about what hoarders collect? A. to indicate that Americans are the only people who suffer from hoarding problems B. to suggest that people who collect photographs, stamps, and books are compulsive hoarders C. to illustrate how many Americans have to treat their hoarding problems with a psychologist D. to show that compulsive hoarders start out collecting things like any other person Solve for x and graph the solution on the number linebelow.- 4x 7 > 9 or -11 >-4x 7 Which sentence should be included in the fourth paragraph? Consider a $40,000 portfolio consisting of three stocks. Their values and expected returns are as follows: Stock Investment Expected Return A $ 5,000 15 % B 15,000 8 C 20,000 23 What is the weighted-average expected return on the portfolio? The volume of a cylindrical water tank is 2783 cubic feet. If the radius is 11 feet, what is the height of the tank? Help please, Which equation represents a line that passes through the two points in thetable?1156O A. y+1-(x+1)OB. y+6 -x +5)O C. y-1-0-1O D. 7-6 = $(x-5 PLEASE HELP ASAP ILL MARK BRAINLEST Why would Mirabeau Lamar not want Texas to join the U.S.?1.He was making large amounts of money2.Texas has no need for a president if they are a state.3.He wanted to to give Texas back to Mexico4.He did not like America When California applied for statehood, Southern states feared For Questions 1-4, consider the following code: def mystery1(x): return x + 2 def mystery2(a, b = 7): return a + b #MAIN n = int(input("Enter a number:")) ans = mystery1(n) * 2 + mystery2 (n * 3) print(ans) What is the output when the user enters -4?What is the output when the user enters 3?What is the output when the user enters -2?What is the output when the user enters 9? Help me pleaseeee :) for brainliest answer Which of the following statements best describes the value of the expression 9x 3 when x = 7? A. The result is a fraction. B. The result is a prime number. C. The result is a composite number. D. The result is a whole number that is neither prime nor composite. a car is 400 miles from yuma. after 7 hours it is 50 miles from yuma. which function describes the cars distance from yuma Describe a gear train that would transform a counterclockwise input rotation to a counterclockwise output rotation where the driven gear rotates three times for every rotation of the driver gear. James Watt compared measurement of power produced by engines toThe amount of power a horse used to pump water.The amount of energy a horse used to pump water.The amount of force a horse used to pump water.The amount of work a horse used to pump water. 2x+2(3x-2)+4-2(3x+8) What is the slope of the equation y = -5x - 10? how do the Egyptians relate with all the other civilizations?