Can someone please help me? :((

Answer:

D) The electrons move around the nucleus in an electron cloud

Explanation:

i just did it on usa test prep !

The halogen family of elements includes bromine. Iodine, fluorine, and chlorine are some of its buddies. Bromine is very reactive and, like the other halogens, contains seven electrons in its outer shell.

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I agree that the chemical reaction between zinc metal and oxygen gas to produce large amounts of light and heat are released is a combustion reaction and not a redox reaction.

A chemical reaction is a process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

A chemical reaction can be of various types namely;

A combustion reaction is reaction wherein a chemical substance is combined with oxygen, usually at high temperature, releasing heat.

On the other hand, a redox reaction is a type of reaction that involves the transfer of electrons i.e. simultaneous occurence of oxidation and reduction.

Therefore, I agree that the chemical reaction between zinc metal and oxygen gas to produce large amounts of light and heat are released is a combustion reaction and not a redox reaction.

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Answer:

element

Explanation:

Atoms are the building blocks of all matter. When a substance contains only one type of atom, it is called an element. Each element has a special name and unique properties that are different from all the rest of the elements. All known elements are organized on a chart called the periodic table of elements.

Answer:

An element

Explanation:

An element is a substance consisting the same type of atoms.

The error that has to be corrected is that minerals and rocks both have unique chemical compositions. The right answer is C.

Our bodies need minerals for appropriate growth and function; they can be found in food and on the planet. In contrast to rocks, minerals typically have distinct chemical compositions. Hence, the proper option is C. The chemical makeup of a rock mass is a key determinant in the creation of minerals inside the mass, as a specific mineral can only develop when the required elements are present. Quartz, feldspar, mica, amphibole, olivine, and calcite are examples of common minerals. A rock is an assemblage of one or more minerals, or a body of undifferentiated mineral materials.

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Complete Question:

The following table was made to compare rocks and minerals. What information in the table needs to be corrected?

A. Rocks do have specific chemical compositions and minerals do not have specific chemical compositions.

B. Rocks include granite and marble, minerals include quartz and diamond.

C. Rocks do have specific chemical compositions and minerals do as well.

D. Rocks include quartz and diamond; minerals include granite and marble.

Answer:

It all really depends on the side group the amino acid is on! For instance, out of the  20 side groups used to make proteins, there are only two main groups: polar and non-polar

The chemical's molar mass must be known in order to determine its molecular formula.

Thus,  

Molecular mass = n × Empirical mass

Where, n is any positive number from 1, 2, 3...

Molecular formulas provide the exact amount of atoms of each element in the molecule, in contrast to empirical formulas, which employ the basic or reduced ratio of the components in the compound.

Determining the number of n and the resulting molecular formula are therefore possible if we are aware of the molecular mass.

Its empirical formula is the fundamental whole number ratio of the atoms in a chemical molecule. Two simple instances of this concept are the empirical formulas for sulfur monoxide and Disulfur dioxide, respectively, SO and S₂O₂.

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The principle of faunal succession is a key concept in the study of prehistoric life and the age of sedimentary rocks. It is based on the idea that the fossilized remains of different species of animals and plants found in sedimentary rocks can be used to infer the relative age of the rocks and the conditions that existed when they were formed.

The principle of faunal succession states that over time, the species of animals and plants that lived in a particular area changed and evolved. As a result, the fossilized remains of different species found in sedimentary rocks can be used to infer the relative age of the rocks.

This principle is based on the idea that the fossil record is a record of the evolution of life on Earth. In addition, the principle of faunal succession also provides insight into the ancient environment and climate. For example, the presence of certain types of fossils, such as coral reefs or tropical plants, may indicate that the area was once a warm, shallow sea.

In all, the principle of faunal succession is a powerful tool that connects prehistoric life to the age of sedimentary rocks. By studying the fossilized remains of different species found in sedimentary rocks, scientists can infer the relative age of the rocks and the conditions that existed when they were formed.

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Answer:

670,385k

Explanation:

Answer:

\(\boxed {\tt 1.32291667 \ cm^3}\)

Explanation:

Volume can be found by by dividing the mass by the density.

\(v=\frac{m}{d}\)

The mass of the solid is 12.7 grams.

The density of the solid is 9.6 grams per cubic centimeter.

\(m= 12.7 \ g \\d= 9.6 \ g/cm^3\)

Substitute the values into the formula.

\(v=\frac{12.7 \ g}{9.6 \ g/cm^3}\)

Divide. Note that the grams, or g, will cancel out.

\(v=\frac{12.7}{9.6 \ cm^3}\)

\(v= 1.32291667 \ cm^3\)

The volume of the solid is 1.32291667 cubic centimeters.

Black coffee has a pH of 5, which indicates that it is an acidic solution. The pH of a solution, which ranges from 0 to 14, is determined by the concentration of hydrogen ions (H+).

To understand how pH affects the concentration of H+, we must first understand what pH and H+ are. pH stands for "potential hydrogen," and it's a measure of how acidic or basic a solution is. A solution with a pH of 7 is considered neutral, while a solution with a pH less than 7 is acidic, and a solution with a pH greater than 7 is basic. Hydrogen ion concentration refers to the number of hydrogen ions present in a solution. It is expressed in moles per liter (mol/L) or millimoles per liter (mmol/L). The higher the concentration of hydrogen ions, the lower the pH of the solution. The lower the concentration of hydrogen ions, the higher the pH of the solution. A solution with a pH of 5 has a higher concentration of hydrogen ions than a solution with a pH of 10. The pH scale is logarithmic, meaning that each pH unit represents a tenfold change in the concentration of hydrogen ions.

Therefore, a solution with a pH of 5 has 100,000 times more hydrogen ions than a solution with a pH of 10.To summarize, black coffee with a pH of 5 has 100,000 times higher concentration of H+ ions than a solution with a pH of 10. This means that the black coffee is more acidic than the solution with a pH of 10, which is more basic.

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According to the relation of variables in the electromagnetic spectrum the maximum wavelength of light is 36.3 ×10\(^-\)³¹ m.

The  electromagnetic spectrum consists of electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In the given problem,energy is related to wavelength by the formula, λ=hc/E,λ=6.626×10\(^-34\)×3×10⁸/547×1000=36.3×10\(^-31\) m.

Thus, the maximum wavelength of light is 36.3×10\(^-31\) m.

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Answer:

No new matter can be created, and no matter can be destroyed. Matter can only change in state or chemical composition. The amount of mass before the change will equal the amount after the change.

Explanation:

The correct chemical formula for barium nitride is: b. Ba3N2

The chemical formula for barium nitride can be determined by balancing the charges of the ions involved. Barium ions carry a 2+ charge, while nitrogen ions carry a 3- charge.

To balance the charges, we need two barium ions (2 × 2+ = 4+) for every three nitrogen ions (3 × 3- = 9-). The positive and negative charges must cancel each other out in the compound.

Therefore, the correct chemical formula for barium nitride is: b. Ba3N2

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The energy are there in one photon of orange light whose wavelength is 630nm is  \(3.15401\times10^{-19}\) Joules.

W=c/v, c=speed of light, v=frequency

\(6.3 \times 10^-7=3 \times 10^8/v\)

\(v=3 \times 10^8 / 6.3 \times 10^-7\)

\(v=4.76 X 10^14 Hz\)-frequency of the yellow light.

E=hv, h=Planck's constant,

\(E=(4.76 \times 10^14)Hz \times 6.62607×10^-34 J s\)

\(E=3.15401\times10^{-19}\) Joules- the energy of a single photon of yellow light.

Planck's constant or Planck's constant, is a fundamental physical constant of quantum mechanics. The constant gives the ratio of the energy of the photon to its frequency, and for mass-energy equivalent, the ratio of mass to frequency.

In quantum mechanics, energy is exchanged and absorbed in certain amounts called quanta. The Planck constant is a number that defines the amount of energy in these quantities and expresses how small things can be. Learn more about Planck's constant in this infographic.

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Answer:

c? im pretty sure.

Explanation:

The highest number is 1.6

Answer:

B the temperature of water

Explanation:

The chemical formula for compound two is AQ₂, indicating a higher mass ratio of (mass Q)/(mass A) compared to compound one.

Compound one is denoted as AQ and has a mass ratio of (mass Q)/(mass A) = 0.271. Compound two, on the other hand, has a mass ratio of (mass Q)/(mass A) = 0.362. To determine the chemical formula for compound two, we need to compare the ratios of the masses of the elements.

Since compound one has the chemical formula AQ, it indicates that there is one atom of element A and one atom of element Q present. In compound two, the mass ratio (mass Q)/(mass A) is larger than in compound one, suggesting that there is a greater amount of element Q relative to element A.

To express this in the chemical formula, we use a subscript to denote the number of atoms. Therefore, the chemical formula for compound two is AQ₂, indicating that there are two atoms of element Q for every one atom of element A.

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The extensions of period six and seven are called the lanthanide and actinide series.

The periodic table is divided into groups and periods. The groups are the vertical columns while the periods are the horizontal rows. Metals are generally found at the left hand side of the table while non metals are found at the right hand side of table.

However, at the lower end of the table, the periods six and seven posses an extension. These extensions are most times shown below the table. These extensions of period six and seven are called the lanthanide and actinide series.

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Answer:

The energy required to start a reaction is Activation energy.

Answer:

the area went through major changes in climate over geologic time

Explanation:

Different types of sediment is a good indication of different climates.For example, if an area just experienced the same type of climate, like a desert, we would expect to observe the same types of sediment/rocks in the area

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Compelling questions evoke thought and do not have a straight answer.

The term compelling questions could be used to describe those types of questions that could have as many answers as possible based on the perspective of a person. There is no single answer to a compelling question.

The compelling questions are;

The term supporting questions refers to the questions that buttress a point. They include;

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Answer: monke.

Explanation: 100% correct

Answer:

5.Hey Order of reaction is :-

Y>Z>X

6.Phosphorus is soft, waxy and reactive. It reacts with moist air and gives out light. It ignites spontaneously at about 350C and that's why it is stored under kerosene to prevent its reaction in the atmosphere.

it can be also stored in sealed bottles..

Explanation:

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Nitrogen (N2) and Oxygen (O2) are the most abundant gases in the Earth’s atmosphere, accounting for about 78% and 21% of the atmosphere respectively. Despite being gases that exist in the atmosphere, they are not greenhouse gases. A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range.

They are responsible for the greenhouse effect, which traps heat in the atmosphere and warms the Earth’s surface. Nitrogen and Oxygen are not greenhouse gases because they do not absorb infrared radiation, which is what makes other gases like carbon dioxide, methane, and water vapor greenhouse gases. These gases absorb and emit infrared radiation, trapping it in the atmosphere and causing the greenhouse effect.

Nitrogen and Oxygen are transparent to infrared radiation, which means that they do not trap heat in the same way that greenhouse gases do. Thus, they are not considered greenhouse gases. Greenhouse gases include gases such as carbon dioxide, methane, water vapor, and other trace gases. These gases absorb and emit infrared radiation, trapping it in the atmosphere and causing the greenhouse effect. They are responsible for keeping the Earth’s temperature within a livable range, as without them, the Earth would be too cold to sustain life. Nitrogen and Oxygen are not greenhouse gases because they do not absorb infrared radiation. This means that they are transparent to the radiation, and so they do not trap heat in the same way that greenhouse gases do. Nitrogen and Oxygen may not be greenhouse gases, but they do play important roles in the atmosphere. Nitrogen is an essential nutrient for plants and animals, and it is used in many industrial processes. Oxygen is necessary for breathing, and it is also used in many industrial processes. Without these gases, life on Earth would not be possible.

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The correct order of increasing electronegativity for the given set of elements is: s, p, si, f, where fluorine (F) has the highest electronegativity and sodium (Na) is not included in the set.

Electronegativity is a property that describes the tendency of an atom to attract electrons towards itself when it is part of a chemical bond. In general, electronegativity increases across a period from left to right and decreases down a group in the periodic table.

Looking at the given sets of elements: p, f, si, s and s, f, p, si, we can determine the order of increasing electronegativity.

The correct set of elements arranged in order of increasing electronegativity is: s, p, si, f.

Fluorine (F) is the most electronegative element in the periodic table, and it attracts electrons strongly due to its small atomic size and high effective nuclear charge. Therefore, it has the highest electronegativity.

Following fluorine, oxygen (O) has a higher electronegativity than sulfur (S), which in turn has a higher electronegativity than phosphorus (P). This is because electronegativity generally increases across a period from left to right.

Silicon (Si) is less electronegative than phosphorus but more electronegative than sulfur. It is positioned in the middle of the order.

Lastly, sodium (Na) is less electronegative than silicon and is not included in the given set.

(Note: The set s, f, p, si is not in the correct order of increasing electronegativity, as fluorine should have the highest electronegativity.)

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The nonzero quantity is Heat Transfer.

Heat Transfer is the only quantity that must be nonzero for a constant pressure process at 300K and 1 atm. This is because Heat Transfer is the amount of energy that is required to maintain constant pressure.

All other quantities in this process, such as Work, Internal Energy, and Enthalpy, are zero for a constant pressure process at a given temperature and pressure.

Therefore, the quantity that is nonzero for this constant pressure process at 300k and 1 atm is Heat Transfer.

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