A rectangular block of copper metal weighs 1896 g. The dimensions of the block are
8.4 cm by 5.5 cm by 4.6 cm. From this data, what is the density of copper?

Answer:

alloy

Explanation:

an alloy is formed when two metals are chemically combined together to form a compound

The mass of the CaCo3 to 2 significant numbers = 24 g

In any type of scientific dimension, the perfection of the dimension is represented in the significant integers of that dimension. It also used to show the dimension to the necessary degree of delicacy.

Significant integers comprises every number except the leading zero( s). And if the number after the needed significant integers isn't over to 5, it's rounded down and the needed significant integers is written as is. But if the number after the needed significant integers is at least 5, it rounded up, and the last number on the significant integers demand is increased by a factor of 1.

Exemplifications include :

0.3547 = 0.355 to 3s.f(0.0007 is rounded up to increase the coming number, 4, by a factor of 1)

Hence, the answer would be 24 g

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An atom is mainly constructed of a total of three different particles known as electrons, protons and neutrons.

An atom is neutrally charged because the charge/number of the electrons (negative charge) is equal to the charge/number that the proton carries (positive charge). these charges cancel out each other making the atom neutrally charged.

An ionized atom is called as the one which has some net charge present on it. This charge on it can be either a positive charge or a negative charge.

A radioactive atom is an atom that is an unstable atom and has access of energy in its center. This radio activeness can be caused by adding either neutrons or protons.

To Model a radioactive atom, increase the number neutron or proton present in the nucleus.

Hence, through this we can conclude that to model an ionized atom is done by adding or removing electron(s) from the atom while to model a radioactive atom we add additional Neutron or proton to the nucleus.

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The pair of atoms that is unlikely to form a compound are neon (Ne) and argon (Ar) (option D).

Compounds are substances that are formed by chemical bonding of two or more elements in definite proportions by mass.

Elements combine to form compounds by sharing, donating or gaining electrons. For example, metals donate electrons to nonmetals to form metallic or ionic bonds.

However, noble gases are elements that have a completely filled shells, hence, do not engage in chemical bonding. Examples of noble gases are argon, helium, neon etc.

Therefore, the pair of atoms that is unlikely to form a compound are neon (Ne) and argon (Ar).

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The balance chemical reaction or equation for the given question is :

2Rb (Rubidium) (s) + 2H₂O (Water) (l) → H₂ (Hydrogen) (g) + 2RbOH (Rubidium Oxide) (l)

Rubidium (Rb) is an alkali metal in the similar group (Group I) as sodium (Na) and as one goes down the periodic table of group the ionization energy decreases (downfall).Hence Rubidium (Rb) also reacts with water goes to the creation of hydrogen gas. Its reaction with water (H2O)  is same to that of sodium (Na).

To Balance a Chemical Equation we need to mention the algebraic terms both the sides.

Balancing a Chemical Equation is related to law of conservation of mass.

To Balance a Chemical Equation , place portions as demanded in front of the symbols of formulas so the same number of each type of snippet occurs in both reactants and products.

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Answer:

115km is equal to 11500000cm

Explanation:

We've to find it inadequately weight thing at the admitted election if we know it carries the kinetic energy. Now we've to figure out the relationship between the very post in order to set up our equation. So we know we are looking for the weight length and we've been handed with the kinetic energy.

Now we know that Connect energy has a relationship with the haste. If we are going to rearrange the question then we've two times kinetic energy equals to mass haste forecourt or haste forecourt. You close to two times collected energy that bothered by the mass were haste because the square root of two times connected energy over the mass Right then. Now we've a relationship. They'd kinetic energy on the haste as well.

And now we just have to associate a haste with the wavelength can do this. It's close to cranks constant divided by the instigation we know Constant has a number of 6.63 times 10 to the power of native 34. rather of jewels per second, we are going to use kilograms either square per second, because on the weight of the electron then, which is9.1 times 10 to the power negative 31 we also have a kilogram. So we've to have a kilogram over there to cancel it now onto the haste. It's going to be a big bone , no, two times the kinetic energy, which is five or six. So we've to do a conversion of ev to 1.602 times 10 to the power of negative 19 augar developed by the mass again, which is9.1 times 10 to the power of -0.545 is the final answer.

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The statement would be false as the given equation for the oxidation of glucose, the cell must have a constant supply of carbon dioxide for this reaction to occur. The statement is false because the Carbon Dioxide (CO2) is a product not a reactant.

The oxidation of glucose in the presence of oxygen in the chemical reaction is known as respiration. It is very important for human metabolism rate. It helps proper growth of human metabolism rate and maintain the human body and immune system. The given chemical reaction is :

Glucose (C6H12O5) + 6 O2 -------> 6 Carbon Dioxide (CO2) + Water

The given question is incomplete. The complete question would be Considering the equation for the oxidation of glucose, the cell must have a constant supply of carbon dioxide for this reaction to occur.

You have to mentioned the above statement as True or False.

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The histidine residue would be protonated in a solution with pH 4.0.

pKa value illustrates the pH value at which the protonated and deprotonated forms of the weak acid are in a 1:1 ratio. This means that at pH values below pKa (more acidic, because pH is a negative logarithm of the H+ ion concentration), the dominant form of the histidine residue is the protonated one. On the other hand, at pH values higher than 6.0 (more basic), the deprotonated form is the dominant one.
Because 6 - 4 = 2, this means that the concentration of the protonated form is 100 times higher than the concentration of the deprotonated one.

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The conversion of decigrams into centigrams would not be possible as these are two different quantities.

Hence two different quantities cannot be converted and there is no relationship between them.

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Electronic arrangement of phosphorus is 2,8,5 and its electronic configuration is 1s2 2s2 2p6 3s2 3p3.

The electron arrangement would be 2, 8, 5.

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According to bond energy, the maximum wavelength of light is 475 nanometers.

We need to know about bond energy to solve this problem. Bond energy is the energy needed to bond other atoms in the molecule. To determine the energy in one molecule of chlorine monofluoride, we can use this formula:

E = BE / Na

where E is the energy of photon, BE is bond energy and Na is Avogadro's number (6.02 x 10²³ atoms/mol)

Now, we can calculate the shortest wavelength by using Einstein's equation for photon energy:

E = h . c / λ

where h is Planck constant (6.6 x 10¯³⁴ J.s), c is the speed of light (3 x 10⁸ m/s) and λ is the wavelength.

From the question above, we know that

BE = 251 kJ/mol = 251 x 10³ J/mol

By substituting the given parameters, we can calculate the maximum wavelength

E = BE / Na

h . c / λ = 251 x 10³ / 6.02 x 10²³

6.6 x 10¯³⁴ . 3 x 10⁸ / λ = 251 x 10³ / 6.02 x 10²³

λ = 4.75 x 10¯⁷ m

λ = 475 nm

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Relative to the other substances, water tends to resist changes in temperature because water is highly cohesive.

Molecules of water tends to resist increases in their motion. When water is heated, some of the energy is used to disturb the hydrogen bonds between the neighboring molecules. Bond between two water molecules is the hydrogen bond.

The tendency of water molecules to stay close to each other is due to the strong hydrogen bonding between the atoms. This strong hydrogen bond causes water to resist motion of molecules and remain at room temperature.

Specific heat of water is really high due to which water resist the temperature change. A lot of heat is required to move the water slightly and resist the temperature changes. Heat gets absorbed when the hydrogen bonds break.

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Answer:

Basically it measures the acidity or alkalinity of a substance.

The correct pairing of the elements based on the nature of chemical bonds formed is:

Chemical bonds are bond which are formed between atoms of the same element or different elements by a transfer of a sharing of electrons.

There are two main types of chemical bonds:

Ionic bonds results in the formation of oppositely-charged ions as electrons are transferred from one atom to another.

Example of ionic bonds are the chemical bonds formed between sodium and fluorine to form sodium fluoride, and the chemical bond formed between calcium and oxygen to form calcium oxide.

Covalent bonds are formed when atoms of the same or different elements share electrons between them.

Examples of covalent bonds are the chemical bonds formed between Boron and Nitrogen to form boron nitride.

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A compound whose liquid has a freezing point of 82 deg C , the compound that is the solid is said to be have the melting point (MP) of 82 deg C.

The answer is 82 deg C because freezing of any liquid is an equilibrium process.

It is equilibrium process because at 0 deg C , the number of H2O molecules becoming ice is equal to the H2O molecules as ice melting from to form a liquid water.

The rate of freezing water is equal to the rate of melting of ice.

Thus, there is an equilibrium between solid and liquid water.

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Answer: Yes it can help make cake rise.

Explanation: Its a leavening agent and its a good ingredient for baking.

Answer:

Substance

Explanation:

Substances that do not readily dissolve in water can be described as hydrophobic substances. Hydrophobic substances are those which when exposed.

Answer:

Explanation:

l bozo

Answer: 1 gravitational pull

2not all of the sun would hit the earth so half of the earth would live in darkness

Explanation:

The density of the mercury is 14 gm/ml.

Given,

Volume of cylinder = 22 ml

Mass of mercury in the cylinder = 308 g

We have to find the density of the mercury.

The density of any substance is defined as the mass per unit volume of the substance. Or, it is the ratio of mass to volume. The units of density are kg/m³, g/ml, or g/cm³. Each substance has its own density. It is the mass of an object compared with its volume.

It is given by the formula:

Density = Mass/ volume

Density = 308 gm/ 22 ml

Density = 14 gm/ml

Hence, the density of mercury is 14 gm/ml.

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One limitation to science is that it cannot answer questions about morality.

Science is defined as the systematic study of a structure through careful experiment and observations.

However, there are limitations that are encountered in the field of science which include the questions that science cannot answer.

Some of the limitations of science include the following:

Science cannot answer the question of morality because it doesn't have a link of how man makes his judgement through his consciousness and how ethics, scope of cultural, religious and social influences affects his decisions.

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The difference in lattice energies between MgCl2 and CaCl2 is 269 kJ.

2.    lattice disassociation enthalpy of magnesium oxide is greater than that  of magnesium chloride.

because magnesium chloride consist of 3 ions in total , whereas magnesium oxide has 2 ions and oxide ions are smaller than chloride ions, Which  means that the ions are closer together in the lattice of magnesium oxide than magnesium chloride , and which also increases the strength of the attractions.

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Oxidation State

In chemistry, when naming ionic compounds there will sometimes be a roman numeral after the first element. This number represents the oxidation state of the element. An oxidation state is defined as the hypothetical charge of an atom, assuming that all of its bonds are fully ionic. In other words, the oxidation state shows how many electrons an atom gives or receives after ionization.

In ionic compounds, there will only ever be a roman numeral after the first element. This element will always be the cation (positively charged ion). So, the roman numeral will show how many electrons each cation gave.

When Roman Numerals are Necessary

This is necessary when you deal with transition metals or any other element that has multiple oxidation states. For example, iron can give 2 or 3 electrons. So, when naming a compound with iron you need to use a (II) or (III) to show how many electrons each iron atom gave.

When Roman Numerals are Unnecessary

On the other hand, roman numerals are unnecessary when using an element that only has one possible oxidation state. For example, Na can only give 1 electron ever, so it does not need a roman numeral. Additionally, elements in the second group like Mg can only ever give 2 electrons, so they also don't need a roman numeral to follow their name.

Answer:

proton-27

electron-25

neutron-35

Explanation:

Courtship behaviours usually happen in response to seasonal changes to ensure that mating does not interfere with migration season. So the correct option is A.

Animals engage in courting behaviour, which leads to mating and eventual reproduction. Depending on the quantity of chemical, optical, or aural inputs involved, courtship can be quite basic or extremely complicated, comprising a variety of activities performed by two or more people.

To entice a partner, many species turn to courtship feeding. Some insect species' females employ odorous compounds known as pheromones to draw males in close proximity, like the spongy moth Lymantria dispar. On spring nights, much of the world can hear the courting choruses of frogs of the Rana species and the touching courtship rituals of male painted turtles, Chrysemys species.

Therefore the correct option is A.

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The relative abundance of the isotopes is 2.3137.

The relative abundance for a specific ion in the sample can be calculated by dividing the number of ions with a particular m / z m/z m/z ratio by the total number of ions detected.

Relative abundance = [tex]\frac{m}{z}[/tex]

The atomic masses of Li are 6.941amu.

The atomic number of Li is 3

Relative abundance =  [tex]\frac{6.941}{3}[/tex]

Relative abundance = 2.3137

The relative abundance of the isotopes is 2.3137.

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The isotopes have a relative abundance of 2.3137.

A species' relative abundance is determined by how many of that species there are in relation to all the other organisms in the area. Among the most well-known and extensively researched patterns in macroecology, relative species abundances frequently follow certain patterns.

Relative abundance = m/z

The atomic masses of Li are 6.941amu.

The atomic number of Li is 3

Relative abundance = 6.941/3

Relative abundance = 2.3137

The isotopes have a relative abundance of 2.3137.

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