28Which is true?



a)All elements are made of atoms.



b)All atoms are made of elements.

c)Atoms can be seen with normal microscopes.

d)Only some types of matter are made of elements.



29Which particles make up the center of an atom?

A) only protons

B) only electrons

C)protons and neutronD)neutrons and electrons

Answer: 10 electrons.

Explanation:

Answer:

Explanation:

the maximum number of electrons that can occupy the first five principle energy is that

we know that the maximum number of electrons in an energy level given by the formulae is 2(n^2)

here n=5 as given in the question for the energy level for the 5

put that 5 in the formula we get 2(5^2)

                                               50

so therefore the maximum number of electrons that can be in the first five energy principle level is 50

Substance-induced vs. primary psychiatric conditions are identified after a full month of abstinence, as substance use can mimic psychiatric symptoms. Family history may also be relevant.

It might be challenging to distinguish between basic mental disorders and substance-induced disorders. Since drug usage might mirror mental symptoms, it is not always simple to spot them on the initial visit with the patient. Before reaching a final diagnosis, it is crucial to wait a full month of sobriety, since this will assist reveal any underlying psychological disorders that could be present.

Given that certain psychiatric diseases have a hereditary component, family history might be useful in identifying the condition's nature. Secondary problems can also arise as a result of ongoing opioid usage.

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Answer:

Explanation:

I can help

Answer:

12.67g of Mg / 15.33g of MgO * 100% = 82.6% of Mg

Explanation:

Answer:

5 moles

Explanation:

Given data:

Number of moles of HCl = 5 mol

Number of moles of H₂O produced = ?

Solution:

Chemical equation:

HCl + NaOH     →   NaCl + H₂O

Now we will compare the moles of HCl with H₂O.

                          HCl            :           H₂O

                             1               :             1

                             5               :            5

5 moles of water will be produced.

Answer:

I don't know the exact answer you are looking for

Answer:

The expected outcome when raising the temperature of the beaker of water by 10 °C would be: b. The solid portion would shrink as more ions dissolve into the solution.

Explanation:

If the temperature of the beaker of water containing KCl is raised by 10 °C, it would affect the solubility of KCl in water. In general, an increase in temperature usually increases the solubility of solid solutes in water. However, the specific behavior of KCl solubility with temperature depends on its dissolution process.

In the case of KCl, the dissolution process is endothermic, meaning it absorbs heat. As a result, increasing the temperature would favor the dissolution of KCl in water, leading to increased solubility.

Here, 50% of the solid had already dissolved and the system appeared to have reached equilibrium, raising the temperature would disrupt the equilibrium. The increased temperature would enhance the dissolution process, causing more KCl ions to dissolve into the solution.

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In the Lewis structure of methanol (CH3OH), the OH group is placed on the outside because it is an important functional group that influences the chemical properties and reactivity of the molecule.

The Lewis structure is a representation of a molecule that shows the arrangement of atoms and valence electrons. In methanol, carbon (C) is the central atom bonded to three hydrogen (H) atoms and one oxygen (O) atom. The oxygen atom forms a single bond with carbon and also has two lone pairs of electrons.

The placement of the OH group (hydroxyl group) on the outside of the Lewis structure is significant because it determines the chemical behavior of methanol. The OH group consists of an oxygen atom bonded to a hydrogen atom and represents the presence of an alcohol functional group.

In organic chemistry, functional groups are specific arrangements of atoms within a molecule that give rise to characteristic chemical reactions and properties. The presence and position of functional groups can greatly influence the behavior and reactivity of a compound. In the case of methanol, the hydroxyl group provides the molecule with its characteristic properties.

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Answer:

A- observation

B- hypothesis

C,D,E- experiment

F- conclusion

Explanation:

Lucia has just carried out the scientific process. An observation refers to paying close attention to a particular phenomenon in nature. This leads to the proposition of an intelligent guess about the observed phenomenon. This intelligent guess is called a hypothesis.

The hypothesis now guides the design of an experiment designed to confirm or disprove the hypothesis. The results of the experiment now leads to the formulation of a conclusion as Lucia has just done.

The principle of option D. Uniformitarianism states that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the

Option D. Uniformitarianism is the principle stating that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the geologic past. It is based on the idea that the present is the key to the past. In other words, the same natural laws that operate in the universe today have been operating since the beginning of time.

James Hutton was the first to propose this principle in the late 18th century. He suggested that the Earth was shaped by slow-acting geological forces such as erosion, sedimentation, and uplift over long periods of time. He believed that the same processes were still happening today and that they had operated in the past.

This principle is an important concept in geology because it allows scientists to interpret the Earth's history based on the processes that they observe today. By understanding how these processes work and how they have changed over time, scientists can reconstruct the history of the Earth and its environments.

Uniformitarianism has been tested and proven through many observations and experiments. For example, the study of sedimentary rocks has shown that they were formed in the past through the same processes that are observed today, such as deposition of sediment by water, wind, or ice.

Similarly, the study of volcanoes has shown that they are formed by the same processes as today, such as the movement of magma from deep within the Earth.

In conclusion, Uniformitarianism is the principle that allows us to interpret the Earth's history by observing the processes that shape it today. It is a fundamental concept in geology and has been tested and proven through many observations and experiments.

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Answer:

The equation is already balanced. There's an equal number of materials on each side of the equation.

The appearance and observable qualities of matter are considered to be its physical attributes. Colour, smell, taste, solubility, etc. An attribute that appears during a chemical reaction is known as a chemical property. A few examples include pH, reactivity, and flammability, etc. The correct option is B.

The chemical makeup or content of matter are not altered after a physical transformation.  The internal makeup is unaffected as molecules rearrange themselves during this transformation. The chemical attribute is unaffected by a physical change.

Here both crushing a mineral into powder and picking up a paper clip with a magnet are physical changes.

Thus the correct option is B.

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The answer to your question is "CBr4"

Answer:

c

Explanation:

Answer:they were poisoned with powdered caffeine (C)

Explanation:

I just took the test! And got all the points for this question :) hoped I could help

Answer:

Fats........................

Lipids is the class of macromolecule was described as being most like the hydrocarbons.

Macromolecules are bigger molecules of large size and made of smaller molecules called as monomers, Polymers are macromolecules.

All Macromolecules are not like the hydrocarbon because the macromolecules not only consists of  C and H atoms but also N and O.

Macromolecules are classified into 4 types

Proteins , Carbohydrates , Lipids and Nucleic Acids

Lipids is the class of macromolecule was described as being most like the hydrocarbons.

Lipids are a broad category of chemicals that are mostly nonpolar in nature.

This is due to the fact that they are hydrocarbons with nonpolar carbon–carbon or carbon–hydrogen bonds.

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Answer:

342. 15 g/mol is the mass

Al Aluminium 26.98g 2 atoms per mole = 15.7716%

S Sulfur 32.06g 3 atoms per mole = 28.1151%

O Oxygen 15.99g 12 atoms per mole = 56.1133%

Explanation:

Hope this helps

Answer:

15,7%

Explanation:

What is the percentage of Aluminum in Aluminum Sulfate?

Aluminum Sulfate

is Al2 (SO4)3

its molar mass is

(2 X 27) + (3 X 96) = 54 + 288 = 344

THE % Al IS (54 /344) X 100 = 15,7%

The cell phone is the reactant, and the case is the compound. In a single-replacement reaction, one element in a compound is replaced by another element. In this case, the clear case is replaced by a black case.

The black case is the product of the reaction. The cell phone is still the same, but the case has been replaced.

This process is analogous to a single-replacement reaction because in both cases, one element is replaced by another element. In the case of the cell phone, the clear case is replaced by the black case. In the case of a single-replacement reaction, one element in a compound is replaced by another element.

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Answer:

Explanation:

First of all, we need to understand what gravity is. Gravity in its simplest form can be best visualized as a force of attraction, that pulls all objects that have a mass towards itself.

It is usually exerted by an object with a larger mass and felt by objects with smaller masses.

Putting this into context, the earth exerts a gravitational pull on all substances with masses, which are around it. This includes the oceans, birds, airplanes, clouds, and even gasses in the atmosphere. The atmospheric gasses may be light enough to float, but they can't go very far, since gravity is constantly tugging at them. This keeps the gasses that make up our atmosphere, within a reasonable radius, which is very close to the earth. In a nutshell, gravity prevents them from floating away into outer space.

The question is incomplete, the complete question is;

Giselle is working with a chemical substance in a laboratory. She observes that when the chemical is heated, it gives off a gas. She assumes that the gas is oxygen but decides to test this assumption to verify it. Which type of scientific knowledge is Giselle’s assumption?

A.

fact

B.

hypothesis

C.

law

D.

observation

E.

theory

Answer:

B.

hypothesis

Explanation:

A hypothesis is an intelligent guess put forward to explain an experimental observation. It is a tentative explanation for a scientific observation which must be subjected to careful verification.

Giselle’s assumption that the gas evolved is oxygen is a hypothesis. It must now be tested carefully in order to verify if the hypothesis is true.

To completely react with 5 moles of Al, 15 moles of \(O_{2}\) are needed. This is based on the balanced equation \(4 Al + 3 O_{2} → 2 Al_{2} O3_{2}\).

When 5 moles of Al react with 3 moles of \(O_{2}\), they form 2 moles of \(Al_{2} O_{3}\) according to the chemical equation \(4 Al + 3 O_{2} → 2 Al_{2} O3_{2}\). The reaction involves the oxidation of the aluminum atoms, where the aluminum atoms lose electrons to form \(Al_{3} +\) ions, and the oxygen atoms gain electrons to form \(O_{2}\)- ions.

The \(Al_{3}+\) and \(O_{2}\)- ions then combine to form \(Al_{2} O_{3}\) molecules. This is an example of a redox reaction, where oxidation occurs on one side and reduction occurs on the other side.

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Answer:

pee

Explanation:

ppppppppppppppppppppppppppppppppppppp

0.956 grams of sulfur must be obtained.

The experiment demonstrates the Law of Definite Proportions. This law states that in any chemical compound, the elements are always present in the same proportions by mass.

In this experiment, hydrogen and sulfur combine to form hydrogen sulfide. The mass of hydrogen in hydrogen sulfide is always 0.419 grams, and the mass of sulfur is always 0.956 grams. This is because the elements combine in a fixed ratio of 1:2.

If 0.419 grams of hydrogen are obtained, then 0.956 grams of sulfur must be obtained to satisfy the Law of Definite Proportions.

Here is a table of the masses of hydrogen and sulfur in hydrogen sulfide:

Element Mass

Hydrogen 0.419 g

Sulfur 0.956 g

The Law of Definite Proportions is a fundamental law of chemistry that is based on the principle of conservation of mass. This law states that the elements in a chemical compound always combine in the same proportions by mass. This is because the atoms of the elements in a compound are always combined in the same ratio.

The Law of Definite Proportions is important because it allows us to calculate the masses of the elements in a chemical compound. This information is essential for many chemical calculations, such as determining the formula of a compound or calculating the yield of a reaction.

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Answer:

PET (Polyethylene Terephthalate): This is the most common form of polyester and is used in many applications, such as in clothing, packaging, and bottles.

PCDT (Poly-1, 4-cyclohexylene-dimethylene terephthalate): This type of polyester is known for its high strength and is used in industrial applications, such as for making conveyor belts, hoses, and cables.

PTT (Polytrimethylene Terephthalate): This is a newer form of polyester that is made using bio-based materials. It is used in clothing, carpeting, and other textile applications.

PBT (Polybutylene Terephthalate): This type of polyester is known for its toughness and is used in electrical and automotive applications, such as for making connectors, switches, and housings.

Thermoplastic Polyester Elastomers (TPEE): These are polyester-based materials that have both thermoplastic and elastomeric properties. They are used in applications such as automotive parts, consumer goods, and sporting equipment.

Answer:  The volume at 600 K will be 0.050 L.

Explanation:

Given: \(V_{1}\) = 0.025 L,    \(T_{1}\) = 300 K

\(V_{2}\) = ?,             \(T_{2}\) = 600 K

Formula used is as follows.

\(\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\)

Substitute the values into above formula as follows.

\(\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{0.025 L}{300 K} = \frac{V_{2}}{600 K}\\V_{2} = 0.050 L\)

Thus, we can conclude that the volume at 600 K will be 0.050 L.

Answer:

Only Organism E is alive, and organism G died before Organism F

Explanation:

I did the test and got it right

The concentration of the aqueous solution that contains 1.5 moles of NaCl in 500mL of this solution is 3 M.

The concentration of an aqueous solution is typically measured in moles per liter (M). In order to calculate the concentration of an aqueous solution that contains 1.5 moles of NaCl in 500mL of this solution, we need to convert the volume to liters.
There are 1000mL in 1L, so 500mL is equal to 0.5L. Therefore, we can use the formula:
Concentration (M) = moles of solute ÷ volume of solution (L)
Plugging in the values we have:
Concentration (M) = 1.5 moles ÷ 0.5 L
Simplifying the equation:
Concentration (M) = 3 M
Therefore, the concentration of the aqueous solution that contains 1.5 moles of NaCl in 500mL of this solution is 3 M.

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Answer:

ABC

Explanation:

Answer:d

Explanation:

Answer:

The answer is D

Explanation:

I took the test!

Answer:

The model is missing plants, fish and other details found in a real river

The model is much smaller then a real river

Explanation:

Answer:

The model is missing plants, fish and other details found in a real river

The model is much smaller then a real river

Explanation: