In your own words, describe what is the role or function of the neutron in the atom's nucleus

Answer:

8.75 × 10³

Explanation:

Multiply the coefficients and the exponential terms separately; then multiply them together

2.5 × 3.5 = 8.75.

When you multiply exponential terms, you add the exponents.

10¹⁰ × 10⁻⁷ = 10⁽¹⁰⁻⁷⁾ = 10³

The product is 8.75 × 10³.

A scientific calculator does the operation automatically. The buttons may have different labels on your calculator, but the key sequence is usually something like

2.5 Exp 10 × 8.5 Exp +/- 7 = 8.75×10⁻³

Answer:

Grinding, melting, dissolving, and evaporating are all physical changes. No new substance or substances are formed as a result of a physical change. A chemical change results in the formation of one or more “new” substances. These new substances differ in chemical properties and composition from the original substance.

Explanation:

A lab report on physical and chemical change would include an understanding of the two concepts, the procedures followed in the experiment and the results obtained. Physical changes involve a change in form, not in molecular composition, while chemical changes involve a change in molecular structure leading to the formation of a new substance.

A lab report on physical and chemical change involves first understanding these two key concepts. A physical change is a change in the form of a substance, but not in its molecular composition. Examples include changes in state, such as melting ice into water. A chemical change, on the other hand, involves a change in the substance's molecular structure, which leads to new substances being formed. For instance, when iron rusts in the presence of moisture, it forms a new substance, iron oxide.

To write the report, you'd first list the objectives of the experiment, the materials used, and the procedures followed. Data collected during the experiment should be detailed, and then results discussed and interpreted. Conclusions made should be based on the experiment's outcomes and evidence. Remember to always observe proper lab safety protocols and discuss these in your report too.

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d) 1 and 4

The cat's displacement is forward 0.8 m

Since a cat jumps 1 m forward and then crawls 0.2 m backward. To find what is the displacement of the cat, we know that the total displacement of the cat is D = positive displacement + negative displacement

Now, since the cat jumps 1 m forward, this is positive displacement, d = + 1 m.

Also, since the cat crawls 0.2 m backward, this is negative displacement, d' = - 0.2 m

So, the total displacement of the cat D = d + d'

= + 1 m + (- 0.2 m)

= + 1 m - 0.2 m

= + 0.8 m

Since the forward direction is positive, the cat's displacement is forward 0.8 m

You need to do something like that your self so sorry can help.

A constant in any experiment is a variable that remains constant for the entire experiment, this constant helps to identify the other variables of the experiment and come to a conclusion. Here, in this experiment the number of days remains constant for the entire experiment which is 5 days as given in the options. Along with that the type of the plant, water amount, sunlight, 30 days of the whole experiment, and the number of plants remains the same for the entire experiment.

In the experiment the independent variable is the length of the old fish sticks aging , as per the study done by the experimenters the age of the old sticks will produce more compost which will result into taller eggplants. This will be independent of other variables in the experiment, as the decomposition of the fish sticks will be increased by everyday and the quality of the compost will also increase according to it, which will also produce taller eggplants. Here, the independent variables are 3, 6, 12 months .

The experiment which is considered for proving the hypothesis is that older fish sticks will give good quality of compost that will result into high production of taller eggplants. This will be supported by the experimental results by different individuals.

The growth of eggplant is the dependent variable in this experiment as it will be greatly influenced by other variables of the experiment. The variable which depends on other factors of experiment is called as the dependent variable. Here, in this case the height i.e. growth  of th eggplant is the dependent variable which will be the result of other varying factors of the controlled experiment.

The correct electron configuration for Mn is 1s²2s²2p63s²3p64s²3d⁵.

The correct electron configuration for Mn is 1s²2s²2p63s²3p64s²3d⁵. This means that manganese has a total of 25 electrons. The electron configuration represents the distribution of these electrons into different energy levels and orbitals. In the case of Mn, the 3d sublevel is partially filled with 5 electrons.

some of the alpha particles were deflected, most of the alpha particles were reflected, and a few of the alpha particles passed through the gold foil.

Answer:

b. Rutherford's experiment had the following results: a few of the alpha particles were deflected, some of the alpha particles were reflected, and most of the alpha particles passed through the gold foil.

Explanation:

Rutherford performed a series of experiments which marked an alpha particle beam on a thin gold foil and the scattering pattern was measured using a fluorescent screen. Alpha particles were detected bouncing off the gold foil in all directions, and some back at the source.

By firing alpha particles into the foils, he observe that only a small fraction of the alpha particles deflected and most flew directly through the foil.

Most rays were deflected because they pass very close to the center with an electric charge of the same type as alpha rays; very few bounced because centers of positive charge collided head-on.

The deepest, the solid iron-nickel core at the center.

The earth layers are crust, lithosphere, mantle, outer core, and inner core. But the inner core of earth experiences the greatest pressure. This layer also has the highest temperature.

Answer: atoms of the same element.

Justification:

There are two kinds of pure substances: elements and compounds.

Elements are pure substances consiituted by one kind of atoms. They cannot be divided into simpler substances either by physical or chemical means. This leads you to the answer of the question: atoms of the same element is not an example of compound, but of elements.

On the other hand, a compound is a chemical combination of two or more different atoms. The compounds can be splited into simpler substances (the elements) by chemical means.

Hence, second, third, and fourth choices are all examples of compound: they are pure substances of two or more kind of atoms.

The correct answer is cyanate.

The polyatomic ion with the formula CN⁻ is called cyanate. A polyatomic ion has two or more atoms bonded together.

CN⁻ contains the cyano functional group wherein a carbon atom forms a triple-bond to a nitrogen atom. CN⁻ is a polyatomic anion that is present in inorganic compounds.

The polyatomic ion with the formula CN- is called cyanide.

cyanide is a negatively charged ion that is formed by the combination of a carbon atom and a nitrogen atom. The carbon atom has a valence of 4, and the nitrogen atom has a valence of 3.

When these two atoms combine, they share one of the electrons from the carbon atom with the nitrogen atom, resulting in a negative charge on the ion.

Cyanide is a very poisonous ion, and it can be fatal if ingested. It is also used in some industrial processes, such as the production of plastics and synthetic fibers.

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Any substance that is made up of only one type of atom or molecule is said to be a pure single  substance whereas substance that is made up two or more different elements or molecule is said to be a mixture.

Air: Different types of gases are present in air that is nitrogen, water vapors, oxygen etc. So, air is a mixture.

Ammonia gas: It consists of only one molecule namely ammonia throughout the substance so it is a pure single substance.

Hydrochloric acid: It is made up by dissolving hydrochloric gas in water so it is a mixture.

Salt water: It is mixture as water and salt are being mixed which are two different substances.

Hence, ammonia gas is a single substance.

The formula of ammonia gas is NH₃. Ammonia gas is a single substances of matter. It is a pure kind of substance which consist of single phase of matter.

A substance is pure if it contains only one type of constituent material. A pure substance is stuff with consistent properties across its entire surface. Atoms are incredibly microscopic particles that make up all stuff.

All that is in the air is a concoction of different gases. Nitrogen, oxygen, which is necessary for both human and animal life, carbon dioxide, water vapor, and trace amounts of other elements make up the atmosphere (argon, neon, etc.)

Salt water contain salt and water in it so, it is a mixture of two molecules. Air is the mixture of many gases. Hydrochloric acid is formed by the reaction of hydrogen and chlorine. so they are not on kind of matter.

Thus, the ammonia gas is a sample of matter which is present in single substance. option 2 is correct.

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Answer:

its ethier A OR C

Explanation:

I take it your doing the IA? If so you should have a picture of elements above the question. Oxygen is the only one labeled with 16 as the atomic mass :)

Answer:

A) oxygen with an atomic number of 8 with an 99.7% of natural abundance.

Explanation:

Answer : The metal X is, zinc (Zn)

Explanation :

The formula of a salt is, [tex]XCl_2[/tex]

First we have to determine the oxidation state of metal 'X'.

Let the oxidation state of metal 'X' be, 'a'.

The oxidation state of chlorine atom is, (-1).

So,

[tex]a+2(-1)=0\\\\a-2=0\\\\a=+2[/tex]

Now we have to determine the atomic number of metal 'X'.

As we are given that,

Number of electrons of X-ion = 28

And, there are (+2) charge present in X-ion that means 2 electrons are removed from the electrons of X-ion.

So, the number of electrons present in metal X = 28 + 2 = 30

Atomic number = Number of electrons = 30

Thus, the element that has 30 electrons or atomic number 30 will be zinc metal.

Hence, the metal X is, zinc

The metal X in the salt XCl2 is Nickel (Ni), which in its ionic form Ni2+ in XCl2, loses two electrons and has a total of 26 electrons.

The salt formula given is XCl2, where 'X' is a metal cation with 28 electrons. The number of electrons represents the atomic number of the atom when it is neutral. In this case, metal X must be from the 3rd Period of the Periodic Table: Atomic number 28 is Nickel (Ni). However, here, Ni loses two electrons to become Ni2+ to bond with two Cl- ions. So, while the neutral Nickel atom has 28 electrons, Ni2+ ion, which forms in XCl2, has 26 electrons.

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The net ionic equation for the reaction between HCN(aq) and KOH(aq) is H⁺(aq) + OH⁻(aq) → H₂O(l).

The net ionic equation for the reaction between HCN(aq) and KOH(aq) to produce H₂O(l) and KCN(aq), is determined as follows;

The balanced molecular equation is;

HCN(aq) + KOH(aq) → H₂O(l) + KCN(aq)

Split the ionic compounds into their constituent ions:

HCN(aq) → H⁺(aq) + CN⁻(aq)

KOH(aq) → K⁺(aq) + OH⁻(aq)

H₂O(l) remains as H₂O(l)

KCN(aq) → K⁺(aq) + CN⁻(aq)

The complete ionic equation, including all ions:

H⁺(aq) + CN⁻(aq) + K⁺(aq) + OH⁻(aq) → H₂O(l) + K⁺(aq) + CN⁻(aq)

Write the net ionic equation, excluding the spectator ions:

H⁺(aq) + OH⁻(aq) → H₂O(l)

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The net ionic equation is H⁺(aq) + OH⁻(aq) ---> H₂O(l). Net Ionic equation shows the essential reaction between the hydrogen ion and hydroxide ion, which forms water. The potassium and cyanide ions are just along for the ride!

H⁺(aq) + OH⁻(aq) ---> H₂O(l)

H⁺(aq): This is the hydrogen ion, which comes from the dissociation of hydrocyanic acid (HCN) in water. HCN is a weak acid, which means it doesn't fully dissociate in water, but it does release some hydrogen ions (H⁺).

OH⁻(aq): This is the hydroxide ion, which comes from the dissociation of potassium hydroxide (KOH) in water. KOH is a strong base, which means it fully dissociates in water, releasing hydroxide ions (OH⁻).

H₂O(l): This is the product of the reaction, which is water. When the hydrogen ion (H⁺) and hydroxide ion (OH⁻) combine, they form water (H₂O).

Spectator ions: The potassium (K⁺) and cyanide (CN⁻) ions are spectator ions, which means they don't participate in the reaction. They remain in solution, but they don't react with each other or with the hydrogen and hydroxide ions.

Here's what's happening in the reaction:

So, the net ionic equation shows the essential reaction between the hydrogen ion and hydroxide ion, which forms water. The potassium and cyanide ions are just along for the ride!

ANSWER:

Potential energy due to the position of an object above Earth's surface is called gravitational  potential energy.

EXPLANATION:

Gravitational energy is the potential energy compared with gravitational force, as work is  needed to further things against Earth’s gravity. The potential energy due to high positions is  called gravitational potential energy, and is evidenced by water in an elevated storage or kept  behind a dam. If an article falls from one point to different point inside a gravitational field, the  force of gravitation will do actual work on the object, and the gravitational potential energy will  decrease by the same amount.

Answer. The gaps on Mendeleev's table have never filled because those elements were not  been discovered at that time.

Explanation:

Answer:

represented elements not discovered in his time

Explanation:

When a lid is placed on a pot of boiling water, water drops form all over the lid's inner surface. The vapors of water that are formed up on boiling escape in to the surroundings when there is no lid on the pot. When the pot is covered with a lid the gaseous water molecules condense on the cooler inner surface of the lid to form liquid water droplets. So, the best statement that describes the change in water vapor molecules as they change to liquid, a phenomenon called condensation, is that the change here is a physical change.

Answer:

In both models, electrons move around a positively charged nucleus filling different energy levels called shells.  

Explanation:

Bohr's model places electrons in ascending energy levels orbiting in a circular motion around the nucleus. The quantum mechanical model also places electrons around a positively charged nucleus following ascending energy levels, but this time these don’t move in a circular manner but instead randomly inside clouds of probability.  

C is the correct answer choice.

Answer:

D

Explanation:

2MnO2 + H2O => Mn2O3 + 2OH is the correct balanced equation. All others are missing or have incorrect coefficients.

Explanation:

A reversible reaction is a reaction which results in the formation of products which gives back reactants. Therefore, it is said that a reversible reaction occurs in both forward and backward direction.

Thus, it can be concluded that a reversible reaction is a reaction that takes place in the both directions . If the reaction were to equilibrium, the rate of the forward reaction would equal that of the reverse reaction.equilibrium.

A reversible reaction is a reaction that takes place in the both direction. If the reaction were to equilibrium, the rate of the forward reaction would equal that of the reverse reaction.

The reaction in which reactants is converted into products and products is converted into reactants simultaneously is called reversible reaction.

The equilibrium is takes place in reversible reaction when reversible reaction occurs in closed vessel.

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Answer:- choice d is correct. Sr<Ca<Be .

Explanations:- Br, Ca, and Sr are all elements of same group as they all have 2 valence electrons. As we move down in a group, a new shell is being added that increases the size of the atom. As the size of an atom increases, it is easy to remove the electron from it's outer most shell in it's gaseous state. Since, Be is above Ca and Ca is above Sr. The size increases in the order, Be < Ca < Sr. It means Be is the smallest one of them and so it's hard to remove from it's outer most shell and hence it's ionization energy is higher.

Sr is largest one in these three elements and so it's easy to remove outer most electron from it that means the ionization energy is least. Ca is between Be and Sr.

So, an increasing order of ionization energy is Sr<Ca<Be . Choice D is correct.

Answer:

D.

Sr < Ca < Be

Explanation:

PLATO

the answer is a- qualitative data

The correct answer is A. Qualitative data

Explanation:

In research and therefore in observation, qualitative data is the type of data that describes non-numerical information or data, for example in reactions qualitative data can be physical properties or changes in color. This is the opposite of quantitative data that focuses on numerical information such as the amount of a substance. This means observing a reaction container has become warm is an example of qualitative data because the scientist is describing qualities in reaction but not quantities or numerical information.

18.4 * 10^9 lbs = (18.4 * 10^9)/2000 tons  

Cost = ((18.4 * 10^9)/2000 ) * 318  

Cost = $ 2925600000

Answer:

2'925.600'000.000‬ $ approximately 2,93 billion $

Explanation:

In order to get the total cost of the Phosphoric Acid produced, it's necessary to convert the Phosphoric Acid pounds into Tons using the given conversion and knowing that [tex]1 billion = 1'000.000'000.000[/tex] :

[tex]18.4 billon(lb) * \frac{1'000.000'000.000(lb)}{1 billon(lb)} *\frac{1(Ton)}{2000(lb)} =9.200'000.000(Ton)[/tex]

and knowing a Ton cost 318$ we can multiply by 318$ and get the result:

[tex]9.200'000.000(Ton) * \frac{318\$ }{1(Ton)} =2'925.600'000.000\$[/tex]

This is approximately 2,93 billion $.

The answer for this question is A

Answer is: the molarity of HCl found in a titration is 0.1 M.

Balanced chemical reaction between hydrochloric acid and sodium hydroxide:

HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l).

From balanced chemical reaction: n(HCl) : n(NaOH) = 1 : 1.

n(HCl) = n(NaOH).

c(HCl) · V(HCl) = c(NaOH) · V(NaOH).

c(HCl) = c(NaOH) · V(NaOH) ÷ V(HCl).

c(HCl) = 0.1 M · 50 ml ÷ 50 ml.

c(HCl) = 0.1 M; molarity of hydrochloric acid.

Answer:

A. buoyant force is equal to the weight of the object

Explanation:

An object floats when the buoyancy is equal to the weight of the object. According to Archimedes Principle for flotation, the weight of the object should be equal to the weight of the water displaced by the submerged part of the object. If the weight of the object is greater than the weight of the water displaced by the submerged part of the object, it will sink.

Elements' properties are based on electronic configuration leading to similarity and differences within families and periods. Alkali metals and halogens react violently due to electron donation and acceptance. Ordering of atomic radius and electronegativity is based on size nuclear charge and electron configurations. Electron affinity and ionization energy differ based on adding or removing electrons. Fluorine has higher ionization energy due to size and charge.

The properties of elements are determined by their electronic configuration. While elements in the same family have similar valence shell configurations, leading to shared properties, not all properties are the same due to variation in atomic size, nuclear charge and more.

The halogens are more reactive than noble gases, which are stable due to their full outer electron shells, giving them different properties. Elements in the same period do not share many properties as moving across a period involves changes in valence shell configuration and other factors.

The most violent reactions generally occur when one element readily donates electrons (alkali group) and another readily accepts them (halogens).

By increasing atomic radius: oxygen, carbon, aluminum, potassium by increasing electronegativity aluminum, sulfur, oxygen, neon.

Electron affinity is the energy change when an electron is added to a neutral atom, while ionization energy is the energy required to remove an electron from a neutral atom. Fluorine has higher ionization energy than iodine due to its small size and high effective nuclear charge.

Elements in the same family generally have similar properties due to similar valence shell configurations.

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