Identify the one thing that you were most surprised by in the quiz. Explain
why.

Answer:

I don't know sorry am read in 5 class

Answer:

b) theory

Explanation:

Answer:

theory or, conclusion is the answer

Answer:

A. All isotopes have no charge

Answer: Metallic bonding.

Explanation: Aluminum forms metallic bonds with itself. This results in a metallic lattice structure.

Aluminum is found in the 13 group of periodic table and it mostly forms ionic bonds with metal. The structure of Aluminum is Orthorhombic mainly.

What is element?

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.

The structure of Aluminum is Orthorhombic and it contains high neutron capture cross section. It is very stable in dry air but oxidizes in moist air. It reacts with oxygen to form Al₂O₃.Valence of Aluminum is III. Its electronic configuration is  [Ar]3d¹⁰ 4s² 4p¹

Thus  structure of Aluminum is Orthorhombic and metallic bond is formed by Aluminum

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Answer:

A

Explanation:

Answer:

I'm not quite sure what the question is. What is the third step? I think I can help, would you mind commenting what the third step is? :)

Explanation:

Answer:

What is surface tension?

Explanation:

Surface tension and droplets: Surface tension is responsible for the shape of liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer.

Surface tension forces between mucosal surfaces play an important role in the pathogenesis of the disease. The obstruction of upper airway elicit the activation of autonomic nervous system, hypoxemia, and arousal from sleep.

Hope it helps

Answer:

Butanoic acid and 2-propanol reacts to form isopropyl butyrate.

Explanation:

brainliest plz

toward, more

away from, less

Explanation:

When the northern hemisphere is tilted toward the sun, the sunlight is more direct than it is in the southern hemisphere. This explains why it's wintertime in Australia while at the same time, it's summertime in the US.

When the northern hemisphere is tilted away from the sun, the sunlight is less direct than it is in the southern hemisphere. This explains why it's summertime in Australia while it's wintertime in the US.

The heat of formation of CuBr₂ (s) = -141.8 kJ/mol

The heat of reaction ΔH = ∑ΔHproducts - ∑ΔHreactants

ΔH = ΔHCuBr₂ (s) + ΔHCl₂ (g) - [ΔHCuCl₂ (s) + ΔHBr₂(l)]

where ΔHCuBr₂ (s) = heat of formation of CuBr₂ (s),  ΔHCl₂ (g) = heat of formation of Cl₂ (g) = 0 kJ/mol, ΔHCuCl₂ (s) = heat of formation of CuCl₂ (s) = -205.9 kJ/mol, ΔHBr₂(l) = heat of formation of Br₂(l) = 0 kJ/mol and ΔH = heat of reaction = 64.1 kJ/mol

Substituting the values of the variables into the equation, we have

ΔH = ΔHCuBr₂ (s) + ΔHCl₂ (g) - [ΔHCuCl₂ (s) + ΔHBr₂(l)]

64.1 kJ/mol = ΔHCuBr₂ (s) + 0 kJ/mol - [-205.9 kJ/mol + 0 kJ/mol]

64.1 kJ/mol = ΔHCuBr₂ (s) + 0 kJ/mol + 205.9 kJ/mol - 0 kJ/mol

64.1 kJ/mol = ΔHCuBr₂ (s) + 205.9 kJ/mol

ΔHCuBr₂ (s) = 64.1 kJ/mol - 205.9 kJ/mol

ΔHCuBr₂ (s) = -141.8 kJ/mol

So, the heat of formation of CuBr₂ (s) = -141.8 kJ/mol

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I'm not able to understand that what is written in the pic.. As I can't understand this language..

Treatment that uses drugs to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. Chemotherapy may be given by mouth, injection, or infusion, or on the skin, depending on the type and stage of the cancer being treated.

The mass of water produced by the reaction of the 23 g of [tex]SiO_2[/tex]  is 13.8 g.

The given chemical reaction;

[tex]4Hf (g) \ + \ SiO_2 (s) \ --> \ SiF_4(g) \ + \ 2H_2O(l)[/tex]

In the given compound above, we can deduce the following;

60 g of [tex]SiO_2[/tex]  --------- 36 g of water

23 g of [tex]SiO_2[/tex]  ------------- ? of water

[tex]mass \ of \ water = \frac{23 \times 36}{60} = 13.8 \ g \ of \ water[/tex]

Thus, the mass of water produced by the reaction of the 23 g of [tex]SiO_2[/tex]  is 13.8 g.

In the reaction of the given compound, [tex]4Hf (g) \ + \ SiO_2 (s) \ --> \ SiF_4(g) \ + \ 2H_2O(l)[/tex], what mass of water (in grams) is produced by the reaction of 23.0 g of SiO2?

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so 2.46 X 10^28 contains (2.46 X 10^28)/(6.02 X 10^23) =

(2.46 X 10 X 10^27)/ (6.02 x(10^23) = (24.6/6.02) X 10^ (27-23)=

4.09 X 10^4 = 40,900

Answer:

4.09 X 10^4 = 40,900 moles

Explanation:

How many moles of Magnesium(Mg) are

in 2.46 x 10^28 atoms of Magnesium?

PLEASE LEARN THIS FUNDAMENTAL RULE OF CHEMISTRY...1 MOLE OF ANYTHING CONTAINS AVOGADROS NUMBER OF PARTICLES}

6.02 X 10^23.09

so 2.46 X 10^28 contains in moles(2.46 X 10^28)/(6.02 X 10^23) =

(2.46 X 10 X 10^27)/ (6.02 x(10^23) = (24.6/6.02) X 10^ (27-23)=

4.09 X 10^4 = 40,900 moles

Answer: Is B: the supply will eventually be exhausted.

Explanation:

there is only so much coal in the world as in many other elements. That is why we are looking for more appropriate and resourceful way of supplying energy and it is a lot safer for the workers involved

As coal is a nonrenewable source of energy so its supply will eventually be exhausted. Therefore, option (B) is correct.

Non-renewable energy can be described as energy that comes from fossil fuels such as coal, natural gas, crude oil, and uranium. Non-renewable energy requires human intervention to create it suitable for consumption. Fossil fuels are generally made up of Carbon. Fossil fuels were produced over 300 million years ago.

Non-renewable energy is generally fossil fuels such as coal, oil, natural gas, etc. Fossil Fuels are produced from the remains of animals and plants and can be is divided into three categories.

To produce natural gas from fossil fuels, the decomposition process is longer and conducted with high amounts of pressure and heat. Coal takes millions of years under the crust of the earth to produce through the decomposition of trees, plants, and ferns.

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The answer should be A

VisibleVisible wave length visible wavelength of light that are emitted by Adams can be used to get Nate explosive devices remotely

Answer:

Explanation:

i would say not d im not fully sure but id say c

When molecules present in a bowl of hot soup then they do vibration due to high kinetic energy.

Molecules are the example of chain substance, which can be prepared by the addition of two or more than 2 atoms of same or different nature.

In a hot soup bowl, kinetic energy of the molecules present in that soup increases due to which they move with higher velocity and also shows vibration in their mean position.

Hence, option (C) is correct i.e. vibrate.

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Answer:

[tex]\huge\boxed{\sf 2.27\ atm = 1,725\ mm\ of\ Hg}[/tex]

Explanation:

We know that:

1 atm = 760 mm of Hg (Standardly)

Multiply both sides by 2.27

2.27 atm = 760 * 2.27 mm of Hg

2.27 atm = 1,725 mm of Hg

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Answer:

Characteristics such as melting point, boiling point, density, solubility, color, odor, etc. are physical properties. Properties that describe how a substance changes identity to produce a new substance are chemical properties. ... Physical and chemical properties can be used to classify a substance as ionic or molecular.

Answer:

Explanation:

First, calculate the molar mass of Aluminum Oxide (Al2O3), by multiplying the number of the constituent atoms, by their relative atomic abundances . Inserting the atomic masses into the equation gives you  . Then find the percent of Aluminum by mass, in Aluminum Oxide.  Finally, set up an equality, where 53.02% of the mass of Aluminum Oxide, is 999 grams of Aluminum

Answer: 3750s Happy To Help

Explanation:

Answer:

Cd + ZnSO4 -----> Zn + CdSO4

Explanation:

:)

Answer:

1.physical change because the ice from a solidform cahnged into a liquid form

If an anhydrous Cupric Perchlorate weighs 262.447g/mol initially and weighs 370.540 g/mol after sitting on the bench to absorb water from the air, the number of water molecules absorbed would be 6 moles.

First, let us calculate the amount of water gained during the course of staying on the bench:

Water gained = weight after gaining water - initial weight

                       =  370.540 - 262.447

                        = 108.093g/mole

The total amount of water gained per mol is 108.093. Each water molecule weighs 18.015 g/mole. Thus, the total number of water molecules that will sum up to 108.093 would be:

                         108.093/18.015 = 6 moles

In other words, the number of water molecules absorbed by the Cupric Perchlorate is 6 moles.

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