A sound wave emitted from the device strikes building A perpendicularly and returns to the device after 1,0s. A second sound wave strikes building B perpendicularly and returns to the device after 1,5s. If the speed of sound in air at that point is 340 m/s calculate the distance between the two buildings ​

Answer: the best option to answer the question is the second one (or letter B), "2"

Explanation:

The question requires us to identify how many electrons a calcium (Ca) atom would lose to form an ion.

We can analyze the electron configuration of Ca to understand how many electrons it would lose.

The atomic number of Ca is 20, thus its electron configuration is as it follows:

From the electron configuration, we can see that Ca presents 2 electrons in its valence shell (4s2). To achieve stability, it is easier for Ca to lose these two electrons and form a Ca2+ ion.

Therefore, the best option to answer the question is the second one (or letter B), "2".

Answer:

yes

Explanation:

when chlorine gas reacts with solid potassium then a synthesis reaction takes place which leads to the formation of solid potassium chloride

Answer:

Metals lose electrons when reacting with nonmetals, so the red sphere represents a metal.

Answer:

0.32 grams

Explanation:

To go from moles to grams (I assume you meant mass instead of weight) you start by finding the molar mass. For O2, the molar mass is 32, because there are two oxygen atoms so 16 grams multiplied by 2.

After that, you take your given moles and multiply it by the grams per mole. The moles cancel each other out and you get your value in grams. I have attached my work below.

Hope this helps! :^)

The oxidation state of nitrogen (N) in NaNO3 is +5. option B

To determine the oxidation state of nitrogen (N) in sodium nitrate (NaNO3), we need to assign oxidation numbers to each element in the compound.

In NaNO3, we know that the sodium ion (Na+) has a +1 oxidation state because it is an alkali metal. Oxygen (O) typically has an oxidation state of -2 in compounds, and there are three oxygen atoms in NaNO3. Since the compound is neutral, the sum of the oxidation states must be zero.

Let's assume that the oxidation state of nitrogen is x. Therefore, we can set up the equation:

(+1) + x + (-2) * 3 = 0

Simplifying the equation:

+1 + x - 6 = 0

x - 5 = 0

x = +5

Therefore, the oxidation state of nitrogen (N) in NaNO3 is +5.

The oxidation state of an element indicates the number of electrons it has gained or lost in a compound. In this case, the nitrogen atom in NaNO3 has gained five electrons to achieve a stable oxidation state of +5.

It is important to note that oxidation states are formal charges and do not necessarily represent the actual distribution of electrons in a compound. They are assigned based on a set of rules and can be useful in understanding the reactivity and behavior of elements in chemical reactions.

Option B

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The theoretical yield of the reaction is 1.13 g. The acid H₃PO₄ is the limiting reactant.

Definition of the theoretical yield

The theoretical yield of a given chemical reaction can be obtained from the balanced reaction equation.

Number of moles of Cr =  0.50 g /52 g/mol = 9.6 × 10⁻³ moles

Number of moles of acid =  0.75 g/98 g/mol = 7.7 × 10⁻³ moles

Given that the reaction is 1:1, the limiting reactant would be the acid.

The theoretical yield that is obtained from,

Theoretical yield = Number of moles of product × Molar mass of product

Substitute the values to obtain,

7.7 × 10⁻³ moles × 147 g/mole = 1.13 g

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If deionized water is used instead of the test iron (III) chloride solution, the reported values of the absorbance of the solutions will be highly increased.

A spectrometer is an instrument that measures the concentration of a colored substance as a function of its absorbance. Before a measurement is taken, the instrument is first calibrated using different concentrations of the test solution.

If deionized water is used instead of the test iron (III) chloride solution, the reported values of the absorbance of the solutions will be highly increased.

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The colors in fireworks come from a simple source: pure chemistry. They're created by the use of metal salts. ... Some of these compounds produce intense colors when they are burned, which makes them ideal for fireworks. Others, like potassium nitrate, sulfur and charcoal are often used to help the fireworks burn.

Answer:

Is there a question?

Explanation:

Answer:

yes

Explanation:

Taking into account the definition of Avogadro's number, 0.116 moles of acetic acid are in the sample.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 6.023×10²³ atoms are contained in 1 mole of carbon, then 1.40×10²³ atoms are contained in how many moles of carbon?

amount of moles of carbon= (1.40×10²³ atoms × 1 mole)÷ 6.023×10²³ atoms

amount of moles of carbon= 0.232 moles

So, the amount of moles of carbon in acetic acid that contains 1.40×10²³ carbon atoms is 0.232 moles.

On the other side, the small subscripts placed to the right of some symbol indicate the number of moles of the element that are found in the compound.

So, in pure acetic acid, CH₃COOH, are present 2 moles of carbon in 1 mole of acetic acid.

Then you can apply the following rule of three: if 2 moles of carbon are present in 1 mole of acetic acid, then 0.232 moles of carbon are contained in how many moles of acetic acid?

\(amount of moles of acetic acid=\frac{0.232 moles of carbonx1 mole of acetic acid}{2 moles of carbon}\)

amount of moles of acetic acid= 0.116 moles

In summary, 0.116 moles of acetic acid are in the sample.

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The mass of water vapor that will be produced when iron hydroxide decomposes to form iron oxide and water vapor is 0.126 grams.

The mass of a substance can be calculated stoichiometrically. Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, iron hydroxide decomposes to form iron oxide and water vapor. If 0.500 g of iron hydroxide are decomposed, the mass of water vapor produced can be calculated as follows;

2Fe(OH)₃ → Fe₂O₃ + 3H₂O

Based on the above equation, 2 moles of iron hydroxide decomposes into 3 moles of water vapor.

moles = 0.5g ÷ 106.87 g/mol = 0.00468mol of iron hydroxide.

0.00468 × 1.5 = 0.00701moles of water vapor.

mass of water vapor = 0.00701 moles × 18g/mol = 0.126g

Therefore, 0.126 grams of water vapor will be produced from 0.500 grams of iron hydroxide.

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Answer:

A. CODIS

Explanation:

The Combined DNA Index System (CODIS), administered by the FBI, maintains DNA profiles obtained through federal, state, and local DNA sample collection programs, and makes this information available to law enforcement agencies across the country for law enforcement identification purposes.

Answer:

lunar eclipses have a nice day

Answer:

a

Explanation:

a

Answer:

B. Isotopes of the element.

Explanation:

Isotopes are basically atoms of the same element that contain the same number of protons, but a different number of neutrons.

Explanation:

A) This is a combustion reaction, so acetylene gas will react with oxygen gas to give carbon dioxide and water. The balanced reaction is:

C₂H₂ + 5/2 O₂ ----> 2 CO₂ + H₂O

2 C₂H₂ + 5 O₂ ----> 4 CO₂ + 2 H₂O

To solve this problem we will have to suppose that the gases are at Standard conditions of temperature and pressure (STP). One mol of any gas will occupy 22.4 L at STP. We can use that relationship to find the number of moles of CO₂ that we have in 75.0 L.

1 mol of CO₂ = 22.4 L

moles of CO₂ = 75.0 L * 1 mol/(22.4 L)

moles of CO₂ = 3.35 mol

2 C₂H₂ + 5 O₂ ----> 4 CO₂ + 2 H₂O

According to the coefficients of the reaction, 2 moles of C₂H₂ will react with 5 moles of O₂ to produce 4 moles of CO₂ and 2 moles of H₂O. So to produce 4 moles of CO₂ we will need 2 moles of C₂H₂. So the molar ratio between CO₂ and C₂H₂ is 4 to 2. We can use this ratio to find the number of moles of C₂H₂ necessary to produce 3.35 moles of CO₂.

4 moles of CO₂ = 2 moles of C₂H₂

moles of C₂H₂ = 3.35 moles of CO₂ * 2 moles of C₂H₂/(4 moles of CO₂)

moles of C₂H₂ = 1.675 moles

And finally since 1 mol occupies 22.4 L at STP we can convert back the moles of C₂H₂ into Liters.

volume of C₂H₂ = 1.675 moles * 22.4 L/(1 mol)

volume of C₂H₂ = 37.5 L

B) 2 C₂H₂ + 5 O₂ ----> 4 CO₂ + 2 H₂O

moles of CO₂ = 3.35 mol

4 moles of CO₂ = 2 moles of H₂O

1 mol of H₂O = 22.4 L

volume of H₂O = 3.35 moles of CO₂ * 2 moles of H₂O/(4 moles of CO₂) * 22.4 L/(1 mol of H₂O)

volume of H₂O = 37.5 L

C) 2 C₂H₂ + 5 O₂ ----> 4 CO₂ + 2 H₂O

volume of CO₂ = 75.0 L

4 moles of CO₂ = 5 moles of O₂

1 mol of CO₂ = 1 mol of O₂ = 22.4 L

volume of O₂ = 75.0 L of CO₂ * 1 mol of CO₂/(22.4 L of CO₂) * 5 moles of O₂/(4 moles of CO₂) * 22.4 L of O₂/(1 mol of O₂)

volume of O₂ = 93.75 L

Answer:

a) volume of C₂H₂ = 37.5 L

b) volume of H₂O = 37.5 L

c) volume of O₂ = 93.75 L

Answer:

Choice A. Ammonium chloride.

Explanation:

Consider the bonds in each of the four compounds.

Ammonium chloride \(\rm NH_4Cl\) is an ionic compound. Each

The \(\rm {NH_4}^{+}\) and \(\rm Cl^{-}\) ions in \(\rm NH_4Cl\) are connected with ionic bonds.

What make \(\rm NH_4Cl\) special is that its cation \(\rm {NH_4}^{+}\) is polyatomic. In other words, each \(\rm {NH_4}^{+}\) ion contains more than one atoms. These atoms (one \(\rm N\) atom and four \(\rm H\) atoms) are connected with covalent bonds. Therefore, \(\rm NH_4Cl\) has both ionic and covalent bonds.

Carbon dioxide \(\rm CO_2\) is a covalent compound. Each \(\rm CO_2\) molecule contains two \(\rm C=O\) double bonds in total. \(\rm CO_2\) molecules have no ionic bond.

The name "ethyl ethanoate" might sound like the name of a salt (think about sodium ethanoate.) However, in reality, ethyl ethanoate \(\rm CH_3COOCH_2CH3\) is an ester. The "ethyl" here refers to the \(\rm -OCH_2CH3\) part, originating from ethanol. On the other hand, "ethanoate" refers to the \(\rm CH_3C(O)-\) part, which can be obtained from ethanoic acid.

These two parts are connected with a covalent \(\rm C-O\) single bond. (The \(\rm C\) in ethanoic acid is connected to the \(\rm O\) in ethanol.) As a result, there's no ionic bond in ethyl ethanoate, either.

Sodium chloride \(\rm NaCl\) is an ionic compound. Both the \(\rm Na^{+}\) ion and the \(\rm Cl^{-}\) are monoatomic. While the \(\rm Na^{+}\) and \(\rm Cl^{-}\) in sodium chloride are connected with ionic bonds, neither \(\rm Na^{+}\) nor \(\rm Cl^{-}\) contains covalent bond.

(a) Because acid is caustic, dolphins can perish from exposure to it. Acids are compounds that give other things protons (H+). Acid can react with the proteins and lipids in dolphins' skin when they come into touch with it, leading to chemical burns and damage to the underlying tissue. Systemic consequences from this include death.

(b) Because chlorine is a potent oxidizer, it interacts with red-hot iron powder to produce Iron(III) chloride (FeCl3) rather than Iron(II) chloride (FeCl2). FeCl3 is created when chlorine at high temperatures rapidly accepts electrons from iron atoms. Contrarily, iron interacts with HCl, a less potent oxidizer than chlorine, to produce FeCl2.

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Lithium has an atomic mass of 6.941 amu. Lithium has two common isotopes as lithium-6 and lithium-7.

What are isotopes?

Isotopes are the elements which have same atomic number but different mass number. For example - Carbon has three isotopes- C-12, C-13, C-14. If an element is found to have different isotopes in nature then it’s average atomic mass can be calculated as

Average atomic mass = (m×a + n×b) / (m+n)

Where a = Atomic mass of isotope A of element X

            b = Atomic mass of isotope B of element X

A and B are present in m:n ratio in nature.

Therefore, Lithium has an atomic mass of 6.941 amu. Lithium has two common isotopes as lithium-6 and lithium-7.

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Answer:

The empirical formula=CHO. To explain it is C1H1O1 but we don't put the one that's why it is CHO

Explanation:

Answer:

Two molecules of hydrogen combine with two molecules of oxygen to form hydrogen peroxide. Hence, its chemical formula is H2O2. It is the simplest peroxide (since it is a compound with an oxygen-oxygen single bond). Hydrogen peroxide has basic uses as an oxidizer, bleaching agent and antiseptic

Answer:

2C4H10 + 13O2 -＞ 8CO2 + 10H2O

Explanation:

c = 8 8

h = 20 20

o = 26 26

Answer:

weight = moles x molecular weight = 3.80 x 58.44 = 222.07 g

Explanation:

The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.

To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.

Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):

K2S -> 2K+ + S2-

Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):

MgI2 -> Mg2+ + 2I-

Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):

K+ + I- -> KI

Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):

Mg2+ + S2- -> MgS

Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:

2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS

To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).

Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:

S2- + Mg2+ -> MgS

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Answer:

During __asexual________ reproduction, an identical copy of the parent is produced.