Scientists often use controlled experiments to answer questions. Choose the three correct statements about controlled experiments. (PLEASE INCLUDE THREE ANSWERS)

A) No changes are made to a test group in an experiment.

B) A control group is used for comparison to other groups. Eliminate

C) Only one change can be made per test group in an experiment.

D) Changes can only be made to the control group in an experiment.

E) A controlled experiment must have a control group and test group(s).

If anyone could help with this that would be amazing!

55.03 moles of KCI are produced when 6743 grams of \(KClO_{3}\) decomposes

To determine the number of moles of KCl produced when 6743 grams of \(KClO_{3}\) decomposes, we need to use the concept of molar mass and the balanced chemical equation.

First, let's calculate the molar mass of \(KClO_{3}\)

The molar mass of potassium (K) is approximately 39.10 g/mol.

The molar mass of chlorine (Cl) is approximately 35.45 g/mol.

The molar mass of oxygen (O) is approximately 16.00 g/mol.

So, the molar mass of \(KClO_{3}\) is:

(39.10 g/mol) + (35.45 g/mol) + (3 * 16.00 g/mol) = 122.55 g/mol.

Now, we need to calculate the number of moles of \(KClO_{3}\):

Number of moles = Mass / Molar mass

Number of moles = 6743 g / 122.55 g/mol = 55.03 mol.

According to the balanced chemical equation:

2\(KClO_{3}\) -> 2 KCl + 3 O2,

we can see that for every 2 moles of \(KClO_{3}\), we obtain 2 moles of KCl.

Therefore, the number of moles of KCl produced will be equal to the number of moles of \(KClO_{3}\) since the ratio is 1:1. Thus, 55.03 moles of KCl will be produced.

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answer and explanation

we are given initial temperature and pressure of a gas and a final temperature and we are asked to determine the final pressure

to find this we can use Boyle's law

P1/T1 = P2/T2

we can rearrange to make P2 subject of the formula

P2 = P1T2/T1

= (398 x 602)/503

= 476.3 atm

There are several things to consider before determining which will be less stable and which will be more stable:

1. Opposite charges attract, i.e. a positive charge will be attracted to a negative charge. Therefore, those crystals that have two equal charges will repel each other and will be less stable. As in the case of figure B, this will be the least stable of all, number 4. The rest of the figures have a negative charge followed by an intercalated positive charge.

2. The charges of the ions are also very important, we see in Figure C, a larger charge of ions. While in the other figures the size is +1 or -1, in figure C we see a value of -2 or +2, therefore the force of attraction will be greater and will be more stable. Figure C will be the most stable of all and will have the number 1.

3. Last but not least the size of the molecule and the distance between them will affect the force of attraction. The larger the molecule and the greater the distance between them, the less attractive force it will have. Figure D shows molecules of larger size and greater distance between them, therefore, it will be less stable than figure A. So the order will be:

1. C

2. A

3. D

4. B

Answer: Refract

Explanation:

An example of heterogeneous equilibrium is:

Heterogeneous equilibrium refers to an equilibrium state in a chemical reaction where the reactants and products exist in different physical states or phases. It occurs when substances in different phases, such as solids, liquids, and gases, are involved in a chemical reaction.

Considering the given equations:

The equation I: FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g) represents a heterogeneous equilibrium.

This is because the reactants and products involve different phases (solid and gas). FeO is a solid (s), CO is a gas (g), Fe is a solid (s), and CO₂ is a gas (g). The reaction involves the conversion of a solid and a gas to another solid and a gas, and the equilibrium is established between these different phases.

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The mass (in grams) of fluorine the sample have is 2.91 g

First, we shall determine the mole of 9 grams of cobalt. Details below:

Mole = mass / molar mass

Mole of cobalt = 9 / 58.93

Mole of cobalt = 0.153 mole

Finally, we shall determine the mass of fluorine the present in the compound. Details below:

Mole = mass / molar mass

0.153 = Mass of fluorine / 19

Cross multiply

Mass of fluorine = 0.153 × 19

Mass of fluorine = 2.91 g

Thus, the mass of fluorine is 2.91 g

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Answer:

15 grams of water

Explanation:

15 grams of water of water would lose heat the faster compared to higher masses of water.

Water generally is a poor conductor heat.

Answer:

different types of radiation are defined by the the amount of energy found

Explanation:

in the photons. Radio waves have photons with low energies, microwave photons have a little more energy than radio waves, infrared photons have still more, then visible, ultraviolet, X-rays, and, the most energetic of all, gamma-rays.

Answer:

d = 1.91 g/cm³

d = 1.91 g/mL

Explanation:

Given data:

Mass of cheese = 67 g

Volume of cheese = 35 cm³

Density of cheese = ?

Solution:

Formula:

d = m/v

by putting values,

d = 67 g/ 35 cm³

d = 1.91 g/cm³

1cm³ = 1mL

d = 1.91 g/mL

Answer:

Oxygen

Explanation:

Photosynthesis releases oxygen into the atmosphere and cellular respiration uses that oxygen to release energy from food.

Answer: Where is the folowing?

Explanation:

Answer:

39

Explanation:

Electrons weigh almost nothing, so their mass doesn't really matter for these types of problems. Just subtract 118-79 to find the remaining mass which is for the neutrons.

The numbers (4.64 x \(10^{15\)) + (8 × \(10^{12\) ) will be simplified as scientific notation as \(4.6 X 10^{15\).

To add these two numbers, we need to make sure they have the same exponent. We can convert 8 × \(10^{12\) to scientific notation with the same exponent as 4.64 × 10¹5:

8 × \(10^{12\) = 0.008 × \(10^{15\)

Now we can add the two numbers:

(4.64 ×  \(10^{15\)) + (0.008 × \(10^{15\)) = 4.648 ×  \(10^{15\)

Thus, we can simplify this answer by rounding to two significant figures and expressing it in scientific notation: 4.6 ×  \(10^{15\).

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The first image shows cleavage, same as the second. The third image shows fracture

1. Image 1:

2. Image 2

Image 3:

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The ranking of boiling point is based on the molecular weight and intermolecular forces between molecules.

2 central carbons, each with CH3 bonded to them. A central C has H bonded left, above, behind to the right, and in front to the right. A carbon chain with 5 central carbons, with CH3 bonded to the first, second, and last carbons in the chain. 2 central carbons with CH3 bonded to the outside, and CH3 bonded to the leftmost inside carbon.

In this case, all compounds are hydrocarbons, meaning they are non-polar molecules and exhibit van der Waals forces. However, the length of the carbon chain and the arrangement of atoms in the molecule affect the magnitude of these forces.

The first compound has only two carbons and exhibits weak intermolecular forces, so it has the lowest boiling point. The second compound has three carbons and a more complex arrangement of atoms, resulting in slightly stronger van der Waals forces and a higher boiling point.

The third compound has a longer carbon chain, which increases the molecular weight and results in stronger intermolecular forces, giving it a higher boiling point than the previous two. The fourth compound has the longest carbon chain and has multiple branches, which increases the surface area of the molecule and the strength of the intermolecular forces, giving it the highest boiling point.

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Answer:

The answers are 4, 2, 3, 1

Explanation:

Answer: non-polar covalent

Explanation:

If two atoms have an electronegativity difference of 0.4 or less, they form a non-polar covalent bond.

B is 2.04 electronegativity

H is 2.20 electronegativity

the electronegativity difference is 0.16.

this is less than 0.4 so the bonds are non-polar covalent.

Answer:

To convert joules to calories, you can use the conversion factor:

1 calorie = 4.184 joules

To find out how many calories are in 4,180 joules, divide the given value by the conversion factor:

4,180 joules / 4.184 joules per calorie = 0.9 calories (approximately)

Therefore, there are approximately 0.9 calories in 4,180 joules.

Because this is a double replacement reaction, the iron and potassium will swap places, giving \(\text{K}_{2}\text{Cl}_{2}\) and \(\text{FeS}\).

The names of these compounds are potassium chloride and Iron(II) sulfide

Answer:

1

Explanation:

Lz=projection of L vector on the direction of the magnetic field  

l=-1: theta=135 deg  

l=0: theta=90 deg  

l=1: theta=45 deg

The fact that the infrared thermometers used in medical research were first intended to detect the temperature on Mars has had an impact on that field of study.

Technology for use in outer space, in aviation or other operations outside of Earth's atmosphere, for things like spaceflight, space exploration, and Earth observation, is referred to as space technology.

By enabling high-speed data transport with the development of the internet, enabling research of global natural phenomena, and enabling environmental monitoring, space technology started to be employed for telecommunications and the environment.

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Explanation:

The first step of the Hydrogen fusion process: a nucleus of Deuterium (2H) is formed from two protons with the emission of an antielectron and a neutrino. The basic Hydrogen fusion cycle involves four Hydrogen nuclei (protons) and two electrons and yields a Helium nucleus, two neutrinos and six photons.

Answer:

C just took it

Explanation:

a) Cl-

b) Al

c) Indium

The atomic size of an elements depends on the energy level of the outermost electron and nuclear charge of the nucleus.

Also, you must understand that the atomic radius increases from top to bottom down the group and the decreases from left to right across the period.

a) For the element Cl and Cl-, the

The electronic configuration of Chlorine atom is given as:

The electronic configuration of Chlorine ion Cl- will be

Since the outermost electrons are already on the third energy level, we can determine which has larger radius by determining the electrons that will be attracted by the nucleus. Due to this, the chlorine ion (Cl-) will have a larger radius.

b) For Aluminum and Oxygen, since aluminum has a high energy level than oxygen and below the oxygen in the periodic table, hence Aluminum will have larger radius

c) ) For Indium and iodine, since Indium has a high energy level than Iodine and below the Iodine in the periodic table, hence Indium will have larger radius

Tthe initial temperature of the polystyrene sample is 39.4°C.

Given: Mass of polystyrene sample = 54.2 gSpecific heat of polystyrene = 1.880 J-g°CWater mass = 100.0 g Initial water temperature = 21.0°CWater final temperature = 34.3°CPressure remains constant at 1 atmFormula used:Heat gained by water = heat lost by polystyreneHence,Heat lost by polystyrene = Heat gained by water=> mcΔT = mcΔTwhere,m = mass of polystyrene or waterc = specific heat capacityΔT = change in temperatureThe temperature change is ΔT = 34.3°C - 21.0°C = 13.3°CNow we can use this temperature change to calculate the initial temperature of the polystyrene.Taking the water's specific heat capacity, c = 4.184 J/g°CHeat gained by water = (100.0 g)(4.184 J/g°C)(13.3°C) = 5574 JHeat lost by polystyrene = 5574 JTaking the polystyrene's specific heat capacity, c = 1.880 J/g° ) = 13.3°C Now let's calculate the mass of polystyrene using the specific heat capacity formula.5574 J = (54.2 g)(1.880 J/g°C)(13.3°C - Ti)Ti = 39.4°C

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Title: The First Amendment: Safeguarding Fundamental Freedoms

While all amendments are crucial, the First Amendment holds unparalleled significance in upholding the principles of liberty, equality, and democracy.

The First Amendment to the U.S. Constitution is undoubtedly the most important amendment as it safeguards fundamental freedoms that form the bedrock of a democratic society.

This amendment, which encompasses the rights of freedom of speech, religion, press, assembly, and petition, plays a vital role in protecting individual liberties and ensuring a just and inclusive society. There are three key reasons why the First Amendment stands out as the cornerstone of our democracy.

Firstly, freedom of speech allows citizens to express their ideas, opinions, and criticisms, fostering a robust marketplace of ideas essential for progress and social change. This right empowers individuals to challenge authority, hold public officials accountable, and engage in meaningful dialogue that drives societal progress.

Secondly, freedom of religion guarantees individuals the right to practice their faith without interference from the state. This principle promotes religious tolerance, diversity, and pluralism, creating a society where individuals can freely worship and live in accordance with their beliefs.

Lastly, freedom of the press ensures an informed citizenry by safeguarding independent journalism. A free press acts as a check on governmental power, exposes corruption, and provides essential information necessary for a functioning democracy.

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Answer:

2d

Explanation:

2d nije moguće. moguće je samo 3d do 7d. provjeri periodni sustav!

ako ne razumiješ, obrati mi pažnju

Answer:

I would serve nothing

Explanation:

thank you bye\

Answer:

Explanation:

I would not serve it because what if Their is some dangerous chemical

An instantaneous dipole occurs when a molecule's moving electrons are briefly more concentrated in one place than another, causing the molecule to become temporarily polarized.

The correct option is True.

Dipoles refer to a separation of charges where one end of a substance has a  positive charge while the other end has a negative charge.

In chemical compounds, dipoles occur within a molecule that has covalently bonded atoms or atoms that share electrons in the covalent bond.

The dipole may be permanent dipoles or temporary dipoles.

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