what is the mass of 9.30 moles of SiH4 ?

Final answer:

A substance with a high specific heat requires more energy to increase its temperature by 25°C than a substance with a low specific heat, because it absorbs more heat without a significant temperature change.

Explanation:

A substance that requires more energy to undergo an increase in temperature has a high specific heat. Specific heat is defined as the amount of heat energy required to raise the temperature of 1 gram of a substance by 1°C. A material with a high specific heat will absorb more heat without a significant rise in temperature. For instance, water has a high heat capacity and specific heat, making it resistive to temperature change. Therefore, a substance with a high specific heat needs more energy to experience a temperature increase of 25°C compared to one with a low specific heat. Conversely, a substance with a low specific heat requires less energy to change its temperature, as its temperature will rise more quickly when heat is applied.

Answer:

B. O₃ + O → CS + 2O₂

Explanation:

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Answer:

X-ray in the hospital

Explanation:

Answer:

1 mole of uranium

Explanation:

It is the greatest with about a mass of about 238 amu or 238 g/mol

The correct answer is H20.

In a chemical reaction, there are always two sides, the reactant side and the product side. The reactants are the elements that are reacting together. They are always written at the left side of a chemical equation, with a plus sign written in between two elements. The products are the new compounds that are formed from the reaction of reactants. They are always written at the right side of a chemical equation and a plus sign is used to join them if they are more than one. An arrow pointing to the products usually connect the two side of the equation. For the question give above, the reactant are CH4 and O2 and the products are CO2 and H2O.

The example of a single replacement reaction is as follows: Cu + 2AgNO3 → 2Ag + Cu(NO3)2. Details about single replacement reaction can be found below.

A single replacement reaction is a reaction that involves the displacement of only one element by another element.

In the reaction between copper and silver nitrate as follows: Cu + 2AgNO3 → 2Ag + Cu(NO3)2

Copper displaces silver to form copper nitrate, hence, it can be said to be an example of a single replacement reaction.

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Answer:

At the gaseous phase the intermolecular force of attraction between atoms becomes far apart. The atoms can easily be added up with an electron or electrons can be removed from an atom.

Higher energy is required in this process.

Explanation:

Why do scientists use atoms in the gas phase to measure ionization energies and electron affinities

Electron Affinity is where there is a change in energy when  electron is added to atom in its gaseous phase. The atom becomes negatively charged.

Ionization Energy is defined as the energy required to remove an electron from gaseous atom.

At the gaseous phase the intermolecular force of attraction between atoms becomes far apart. The atoms can easily be added up with an electron or electrons can be removed from an atom.

By balancing the equation, we ensure that the number of atoms of each element is the same on both sides of the equation. The balanced equation is:

C₂H₄ + 3O₂ → 2CO₂ + 2H₂O

Let's break down the equation and explain how it is balanced step by step:

C₂H₄ + O₂ → CO₂ + H₂O

To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides.

Starting with carbon (C), we have 2 carbon atoms on the left side (in C₂H₄) and 1 carbon atom on the right side (in CO₂). To balance the carbon, we place a coefficient of 2 in front of CO₂:

C₂H₄ + O₂ → 2 CO₂ + H₂O

Next, let's move on to hydrogen (H). We have 4 hydrogen atoms on the left side (in C₂H₄) and 2 hydrogen atoms on the right side (in  H₂O). To balance the hydrogen, we place a coefficient of 2 in front of  H₂O:

C₂H₄ + O₂ → 2 CO₂ + 2 H₂O

Finally, we'll look at oxygen (O). On the left side, we have 2 oxygen atoms from O2, and on the right side, we have 4 oxygen atoms from 2CO₂ and 2H₂O. To balance the oxygen, we need to have the same number of oxygen atoms on both sides. Since we have 2 oxygen atoms in O₂, we need to multiply it by 2 to get 4 oxygen atoms:

C₂H₄ + 2 O₂ → 2 CO₂ + 2 H₂O

Now the equation is balanced, with an equal number of atoms of each element on both sides.

Hence, the balanced equation is C₂H₄ + 2 O₂ → 2 CO₂ + 2 H₂O

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A compound is a substance composed of two or more different atoms chemically bonded to one another, for example, water (H₂O) consists of 2 atoms of hydrogen (H) and 1 atom of oxygen (O), so it is the compound. Water is created by chemical reaction:

2H₂ + O₂ → 2H₂O

B. The ignition point for a given fuel is met.

Combustion is a process in which there is reaction between a substance and oxygen which gives off heat. Thus, the source of oxygen is called the oxidizer while the substance is called the fuel. However, the fuel can be inform of liquid, solid or gas and the process of combustion releases heat.

Answer:

Sodium (Na) will become Na+

Explanation:

Every atom is neutral in its natural form, meaning they have the same number of protons and electrons. When an electron is removed from an atom, it becomes a cation (positive ion) with a charge of +1. If the atom looses two electrons the new charge of the resulting ion will be +2. On the other hand if an atom gains one electron the resultiong anion (negative ion) will have a charge of -1. Loosing two electrons will form an ion with charge -2.

Answer:

4pz and 4py

Explanation:

The electron configuration of Kr is:

[Ar] 3d¹⁰ 4s² 4p⁶

4p has 3 subatomic orbitals: 4px, 4py and 4pz

As there are a total of 6 electrons each of the three 4p orbitals have two electrons with opposite spins. Hence 4py and 4pz have equal energy. Option D is correct.  

Option A, 1s and 2s is incorrect, as the energy of the 1st orbital is lower than that of the 2nd orbital.  

Option B, 2s and 2p is incorrect, as the energy of the s suborbital is lower than that of the p, even though they both belong to the same orbital.  

Option C, 3px and 4px is incorrect, as the energy of the 3rd orbital is lower than that of the 4th orbital.  

Option D: Calcium (Ca)

The atomic number of bromine is 35 thus, the electronic configuration will be:

[tex]Br:[Ar]3d^{10}4s^{2}4p^{5}[/tex]

Here, [Ar] defines electronic configuration of argon noble gas with stable electronic configuration and atomic number 18.

The energy level is defined by principal quantum number, n. Since, the valence electrons in bromine are in 4p thus, energy level will be 4 (principal quantum number).

Now, atomic number of barium is 56 and its electronic configuration is as follows:

[tex]Ba:[Xe]6s^{2}[/tex]

Here, [Xe] defines electronic configuration of xenon noble gas with stable electronic configuration and atomic number 54. The valence electronic shell is [tex]6s^{2}[/tex] thus, number of valence electrons are 2.

A. Potassium (K): Atomic number is 19 thus, electronic configuration will be:

[tex]K:[Ar]4s^{1}[/tex]

Here, [Ar] defines electronic configuration of argon noble gas with stable electronic configuration and atomic number 18.

Now, the energy level is same as that of Br but valence electron is 1 which is not equal to that of Ba.

Thus, this is incorrect option.

B. Beryllium (Be): Atomic number is 4 thus, electronic configuration will be:

[tex]Be:[He]2s^{2}[/tex]

Here, [He] defines electronic configuration of helium noble gas with stable electronic configuration and atomic number 4.

Now, the number of valence electrons are same as that of Ba but the energy level is not same as that of Br.

Thus, this is incorrect option.

C. Cadmium (Cd): Atomic number is 48 thus, electronic configuration will be:

[tex]Cd:[Kr]4d^{10}5s^{2}[/tex]

Here, [Kr] defines electronic configuration of krypton noble gas with stable electronic configuration and atomic number 36.

Now, the number of valence electrons are same as that of Ba but the energy level is not same as that of Br.

Thus, this is incorrect option.

D. Calcium (Ca): Atomic number is 20 thus, electronic configuration will be:

[tex]Ca:[Ar]4s^{2}[/tex]

Here, [Ar] defines electronic configuration of argon noble gas with stable electronic configuration and atomic number 18.

Now, it has energy level same as that of Br and number of valence electron is also same as that of Ba thus, it is correct option.

Therefore, calcium (Ca) is the correct element.

Physical Because changing phases such as solid, liquid, gas are physical forms.

The ionic charge for X in the compound X3Y2, with Y having a ionic charge of -3, is +2. This is deduced from the subscripts in the compound formula which correspond to the absolute values of the ionic charges

In the field of Chemistry, the formula for a compound gives a distinct representation of the ions present and their subscripts usually indicate their ionic charges. In the compound X3Y2, the subscript of X (3) corresponds to the absolute value of the charge on the Y ion which is 3 (ignoring the negative sign since we're only interested in the absolute value) and vice versa.

Therefore, since the subscript for Y is 2, the ionic charge for X would be +2.

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Final answer:

The mass of 3.01 x 10^23 molecules of oxygen is 9.632 x 10^23 grams.

Explanation:

The mass of 3.01 x 10^23 molecules of oxygen can be calculated using the concept of molar mass. The molar mass of oxygen (O2) is 32.00 g/mol.

Therefore, the mass of 1 mole of oxygen is 32.00 g.

Using this information, we can set up a conversion factor to find the mass of 3.01 x 10^23 molecules:

1 mole of O2 = 32.00 g

3.01 x 10^23 molecules of O2 = x grams

Cross multiplying gives us:

x = (3.01 x 10^23 molecules of O2 * 32.00 g) / 1 mole of O2

x = 9.632 x 10^23 g

Therefore, the mass of 3.01 x 10^23 molecules of oxygen is 9.632 x 10^23 grams.

Polyatomic ions contains more than two atoms with a net charge upon it. They are formed by covalent bonding between atoms. Hence option C is correct.

What is a polyatomic ion?

A polyatomic ion is cation or anion containing more than two atoms. Polyatomic ions containing a negative charges are anions whereas polyatomic ions with a net positive charge is called cations.

For example, ammonium ion NH₄⁺ is a polyatomic ion with a positive  charge called ammonium ion. It is formed by accepting a hydrogen from a source. This is called protonation.

Similarly, deprotonation of a polyatomic compound leads to the formation of negative charge in polyatomic ions. For example CO₃⁻ is formed by the deprotonation of  HCO₃.

Thus it is clear that polyatomic ions are covalent compounds such as ammonium, carbonate, nitrate ions etc. Thus option C is correct.

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Your question is incomplete. But most probably your complete question was the following:

Which statement is true about a polyatomic ion?

a. It is made up of a crystal lattice.

b. It contains a single atom

c. It is made of atoms that are covalently bonded together.

d. It contains multiple atoms with no charge.

Final answer:

A polyatomic ion is an ion composed of more than one atom bonded together that has a positive or negative charge. It can form ionic bonds with other ions to create ionic compounds.

Explanation:

A polyatomic ion is an ion composed of more than one atom bonded together. It has a positive or negative charge and can form ionic bonds with other ions to create ionic compounds.

For example, the nitrate ion (NO3) consists of one nitrogen atom and three oxygen atoms, and carries an overall charge of 1-. Another example is the carbonate ion (CO3), which consists of one carbon atom and three oxygen atoms and has an overall charge of 2-.

Polyatomic ions can be made up of atoms from the same element or different elements, and they have characteristic formulas, names, and charges that should be memorized.

Answer:

highest velocity

Explanation:

flask a

The new geographical area would be more fertile land as it becomes rich with water, the biodiversity of that area increases; many new species of Birds and animal came in that area.

Flying animals will be able to cross back and forth between the two areas easily.

Answer:The correct answer is option D.

Explanation:

Electrolyte: An electrolyte is defined as those compound which dissociates into ions when dissolved in water and these ions in the solution will facilitate the movement of the electrons from the solution. Thus making it electrical conductive solution.

Good electrolytes are those electrolytes which completely dissociates or ionizes in water.Like strong acid, strong base, water soluble ionic salts(not of weak acid  or weak base).

[tex]HCl(aq)\rightarrowH^+(aq)+Cl^-(aq)[/tex]

HCL; Strong acid gets completely ionized in water.

[tex]KOH(aq)\rightarrow K^+(aq)+OH^-(aq)[/tex]

KOH; Strong base gets completely ionized in water.

Hence, the correct answer is option D.

The mass in amu of 75 atoms of aluminum is ; 2023.5 amu

Given that ;

1 atom of aluminum = 26.98 atomic mass unit

Determining the mass of 75 aluminum atom  

= 26.98 amu * 75 atoms of aluminum

= 2023.5 amu

Atomic mass unit is the mass of (1/12) the mass of an atom of carbon-12 ( the reference standard for isotopes of elements ). from the amu table 1 atom of aluminum = 26.98 amu

Hence we can conclude that the mass in amu of 75 atoms of aluminum is = 2023.5 amu

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Answer:

[tex]\frac{P_1*V_1}{T_1}=\frac{P_2*V_2}{T_2}[/tex]

Explanation:

The combined gas law is the combination of three different laws applied to gases:

Gay-Lussac's Law:

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]

Boyle-Mariotte's Law:

[tex]P_1*V_1=P_2*V_2}[/tex]

Charles's Law:

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

The result of the combination is:

[tex]\frac{P_1*V_1}{T_1}=\frac{P_2*V_2}{T_2}[/tex]

Explanation:

When 30 grams of barium chloride crystals when heated at 400 degree Celsius and again weighed again which comes to be 20 grams. This means that water of crystallization associated with the barium chloride crystal got vaporized when heated at 400 degree Celsius.

Water of crystallization: Water molecules associated to a crystal structure of a compound.

[tex]BaCl_2.2H_2O\overset{400^o C}\rightarrow BaCl_2+2H_2O[/tex]

Hence, the sample of barium chloride crystals was hydrated.

Final answer:

The decrease in mass of barium chloride crystals after heating likely resulted from the loss of water of crystallization or the evaporation of volatile impurities.

Explanation:

The difference in mass of the barium chloride crystals before and after heating indicates that some part of the compound or its adherents has been lost during the heating process. Barium chloride itself is stable at high temperatures, but if it was hydrated barium chloride (BaCl2·xH2O), the heating could cause the water of crystallization to evaporate, which would result in a decrease in the mass.

Another possibility is that there might be impurities or other volatile substances in the crystalline material that could have evaporated or decomposed, resulting in less mass after the heating process.

Answer:

[tex][Fe^{2+} ][/tex]=0.0550 M

[tex][Cl^{-} ][/tex]=0.110 M

Explanation:

Its all due to stoichiometry: the compound is [tex]FeCl_{2}[/tex], thus upon ionizationm there will be two chloride anions for each iron cation:

[tex]FeCl_{2} \rightarrow[Fe^{2+} ]+2[Cl^{-} ][/tex]

Answer:

synthesis

Explanation:

  The reaction equation properly written is shown below:

               4Al + 3O₂ → 2Al₂O₃

  A synthesis reaction is a form of combination of atoms. It involves the formation of a single product from two or more reactants.

Decomposition is the formation of two or more products from a single reactant.

Single replacement is a reaction in which one substance is replacing another.

In double displacement, there is an actual exchange of partners to form new compounds.

Answer:

synthesis

Explanation: