Question 2 2 points)
Which of the atoms shown has an atomic number of 42
1
2
4
7

We can see here that one use of ethanol based on its volatile nature is as a fuel additive.

Ethanol, also known as ethyl alcohol or grain alcohol, is a volatile, colorless liquid that belongs to the alcohol chemical group. It is produced through the fermentation of sugars by yeast or other microorganisms. Ethanol has a wide range of applications, including industrial, fuel, and recreational uses.

Ethanol is a renewable resource that can be used to replace gasoline in some applications. It is also less polluting than gasoline, and it can help to reduce greenhouse gas emissions.

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The number of moles of NO₂ formed when 10.2 moles of NO₃ reacts is 20.4moles.

According to this question, nitrogen IV oxide (NO₂) reacts with nitrogen II oxide (NO) to form nitrogen VI oxide (NO₃) as follows:

NO₃ + NO → 2NO₂

The number of moles of either the reactants or the products can be calculated stoichiometrically as follows:

Based on the above chemical equation, 1 moles of NO₃ reacts to form 2 moles of NO₂.

This means that if 10.2 moles of NO₃ reacts, 10.2 × 2 = 20.4 moles of NO2 will be produced.

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The amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

To find the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C, we can use the equation Q = mcAT.
First, we need to find the value of m, which is the mass of the water in grams. In this case, it is given as 200 grams.
Next, we need to find the value of AT, which is the change in temperature in degrees Celsius.

This can be calculated by subtracting the initial temperature from the final temperature, which gives us 60 C - 20 C = 40 C.
The specific heat capacity of water, C, is given as 4.18 Joules per gram per degree Celsius.
Now we can plug in the values into the equation:
Q = mcAT
Q = (200 g) x (4.18 J/g°C) x (40°C)
Q = 33,440 J
Therefore, the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

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The Br are in 25 g CaBr2 will be approximately 203.87 g of Br.

The molar mass of an element's atoms is calculated by multiplying the element's comparative atomic mass by the molar mass constant.

In the given scenario, we need to find the grams of Br in CaBr2.

We know that,

molar mass of Br = 79.904 g/mol

molar mass of CaBr2 = 199.886 g/mol

CaBr2 = 2 Br + Ca

So, by the given data,

199.886 g = 2 x 79.904 g

255 g = X ( i.e., mass of Br )

X = 255 x 2 x 79.904 / 199.886

X = 203.87 g of Br

Thus, the amount of Br is 203.87gm.

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Answer:

Cu(NO3)2 (aq) + K2CO3 (aq) => CuCO3 (s) + 2KNO3 (aq)

Explanation:

I interpret your question is how to balance the above reaction, right?

Cu(NO3)2 (aq) + K2CO3 (aq) => CuCO3 (s) + 2KNO3 (aq)

Cu: 2

NO3: 2

K: 2

CO3: 2

KCl → k+ + Cl. The ensuing aggregate of ions is identical in each pre-and publish-blend unit of compounds. both comprise Na+, Cl-, okay+, and Br- ions, and no insoluble compounds can result from any mixture of those ions.

The three rules for writing net ionic equations are simply pretty trustworthy. only do not forget to break apart the (aq) substances. best split strong electrolytes.

Delete any ions that seem on both sides of the equation. when an aqueous solution of potassium chloride KCl, while combined with silver nitrate AgNO3 answers insoluble AgCl forms as a white substance. this is an example of a double displacement reaction. due to the fact potassium ion and silver ions displace collectively in the product formation.

The net ionic equation is a chemical equation for a response that lists best those species collaborating inside the reaction. The internet ionic equation is generally utilized in acid-base neutralization reactions, double displacement reactions, and redox reactions.

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The student's method for preparing pure crystals of copper sulfate contains errors and does not produce the desired outcome.

Use copper oxide instead of calcium carbonate: The student should add copper oxide (CuO) to the hydrochloric acid instead of calcium carbonate. Copper oxide reacts with hydrochloric acid to form copper chloride, which can then be converted to copper sulfate through a subsequent reaction with sulfuric acid.

Add sulfuric acid to the copper chloride solution: After the copper chloride solution is formed, the student should add sulfuric acid to it. This reaction between copper chloride and sulfuric acid will yield copper sulfate and hydrochloric acid. The student should ensure that the correct stoichiometric ratio is maintained to maximize the yield of copper sulfate crystals.

Crystal formation: The student should allow the solution to cool slowly after the reaction with sulfuric acid. This promotes the formation of larger, well-defined copper sulfate crystals.

Filtration and drying: Once the crystals have formed, the student should filter the solution to separate the solid crystals from the remaining liquid. The filtered crystals should then be thoroughly dried to remove any remaining water, resulting in pure copper sulfate crystals.

By following these improvements, the student can obtain pure crystals of copper sulfate.

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Answer: 13.23 degrees C

Explanation:

Q= mc(Tfinal-Tinitial)

(Use the specific heat equation)

The final temperature of the water after the absorption of 12.28 kJ of energy has been 13.23 \(\rm ^\circ C\).

Specific heat can be defined as the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree celsius.

The specific heat can be expressed as:

Heat = mass \(\times\) specific heat \(\times\) (Final temperature - Initial temperature)

From the given:

12.28 kJ = 325 g \(\times\) 4.184 J/g\(\rm ^\circ C\) \(\times\) (Final temperature - 4.2 \(\rm ^\circ C\))

12.28 \(\times\) 1000 J = 1,359.8 (Final temperature - 4.2 \(\rm ^\circ C\) )

12,280 = 1,359.8 (Final temperature - 4.2 \(\rm ^\circ C\) )

9.03 = Final temperature - 4.2 \(\rm ^\circ C\)

Final temperature = 13.23 \(\rm ^\circ C\)

The final temperature of the water after the absorption of 12.28 kJ of energy has been 13.23 \(\rm ^\circ C\).

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In the given reaction, chlorine (\(Cl_{2}\)) is being reduced.

In the given reaction:

Mg + \(Cl_{2}\)→ \(Mg^2^+\) + 2\(Cl^-\)

The reactants are magnesium (Mg) and chlorine gas ( \(Cl_{2}\)), and the products are magnesium cations (\(Mg^2^+\)) and chloride anions (\(Cl^-\)).

To determine which species is being reduced, we need to compare the oxidation states (or oxidation numbers) of the elements before and after the reaction. The element that undergoes a decrease in oxidation state is being reduced.

In this reaction, the oxidation state of magnesium changes from 0 to +2. Since the oxidation state of magnesium increases, it is undergoing oxidation, not reduction.

On the other hand, the oxidation state of chlorine changes from 0 to -1. The chlorine atoms in  \(Cl_{2}\) have an oxidation state of 0, while in the chloride ions (\(Cl^-\)), the oxidation state is -1. Since the oxidation state of chlorine decreases, it is being reduced.

Therefore, in the given reaction, chlorine ( \(Cl_{2}\)) is being reduced. It gains electrons and undergoes a decrease in oxidation state from 0 to -1.

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Answer:

Hope this helps ;) don't forget to rate this answer !

Explanation:

The molar mass of a sample can be calculated using the formula:

Molar mass = (molecular weight) / (number of moles)

To find the molar mass, we first need to find the molecular weight of the sample. The molecular weight is the weight of a single molecule of the substance in atomic mass units (amu).

To find the molecular weight, we need to convert the weight of the molecule from grams to amu. One amu is equal to 1.66 x 10^-24 grams.

So, to convert the weight of the molecule from grams to amu, we can divide the weight of the molecule (5.34 x 10^-23 grams) by the conversion factor (1.66 x 10^-24 grams/amu):

Molecular weight (amu) = (5.34 x 10^-23 grams) / (1.66 x 10^-24 grams/amu)

= 3.22 x 10^-22 amu

Now that we have the molecular weight, we can use it to calculate the molar mass. However, we need to know the number of moles in order to do this. Without this information, it is not possible to calculate the molar mass.

Answer:

i agree

Explanation:

Answer:

69.79

Explanation:

According to this question, Gallium element (Ga) has two isotopes namely: 69Ga and 71Ga respectively.

- Isotope 69Ga contains a percent abundance of 60.11 %, the decimal abundance= 0.6011

- Isotope 71Ga contains a percent abundance of 39.89 %, the decimal abundance = 0.3989

Atomic mass of Ga = (mass of isotope 1 × decimal abundance) + (mass of isotope 2 × decimal abundance)

Atomic mass of Ga = (0.6011 × 69) + (0.3989 × 71)

Atomic mass of Ga = 41.4759 + 28.3219

Atomic mass of Ga = 69.797

Atomic mass of Gallium = 69.79

The value of the following expression is 0.0429 rounded off to 0.043. The correct number of significant figures is 2.

The given expression (6.5 - 6.35) / 3.49  is calculated as below

(6.5 - 6.35) / 3.49

0.15 / 3.49

0.04297

0.043

Zeros to the left of the first non-zero digit are considered as not significant. For example 0.00765 has only 3 significant numbers.

When multiplying and dividing measured quantities, the output of the calculation should have the same number of significant figures as the measured quantity with the fewest significant figures. When performing multiple stage calculations, do not round intermediate stage calculation results; keep as many digits as is practical and round off only in the final output

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Answer:

boron has an atomic mass of 10.810 amu consists of two isotopes.

Answer:

boron has an atomic mass of 10.810 amu consists of two isotopes.

Explanation:

If it travells at 330m/s, and it has to travel 5100m just

5100 ÷ 330

because time = distance ÷ speed

= 15.45 s

Answer:

15.4545455 seconds

Explanation:

(5100 m) / (330 (m / s))

5100/330 = 15.4545455 seconds

it's Gram because why not

Hello, Tia! Mass is measured in kilograms or grams. It tells the amount of matter in an object.

Please give me brainliest for more high quality answers! - longstretch

Answer:

Electrostatic Force of Attraction

Hope this helps ;)

Explanation:

Answer:

5mL of 6 M HCl is needed to make 100 mL of 0.3 M of HCl.

Explanation:

Using the dilution formula:

M1V1 = M2V2

M1 = 0.30 M

V1 = 100 mL

M2 = 6.0 M

V2 = unknown

Re-arranging the formula by making V2 the subject of the equation:

V2 = M1V1 / M2

V2 = 0.30 * 100 / 6

V2 = 5 mL

The volume of 6 M of HCl needed to make 0.3 M at 100 mL is 5 mL.

Schrodinger's Quantum Mechanical Model, which is currently recognised by modern science, is the electron model. The electron cloud model is another name for this one.

The term "electron cloud" refers to the current atomic structure model. A physicist from Austria named Edwin Schrodinger argued that electrons do not follow static or permanent trajectories.

The contemporary atomic model, often known as the cloud model, depicts atoms as having a nucleus made up of protons and neutrons and a diffuse gradient or cloud surrounding it that is made up of electrons. Because electron activity is probabilistic, electrons are often depicted as clouds.

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Answer:

Chloroplasts absorb sunlight and use it in conjunction with water and carbon dioxide gas to produce food for the plant. Chloroplasts capture light energy from the sun to produce the free energy stored in ATP and NADPH through a process called photosynthesis.

Explanation:

The main use of hexane is as a solvent to extract edible oils from seed and vegetable crops. Hexane are used as solvents for contact cement, varnishes, and inks.

Hexanes are mostly used as a solvent. It is used to extract edible oils from seeds and vegetables and as a cleaning agent. The high levels of hexane causes mild central nervous system effects it includes dizziness, slight nausea, and headache etc.

In the construction industry, the hexane is an effective chemical which is use as the strongest organic solvents. It dissolves chemical material which allows the objects to bind together to form a strong force.

Thus,  Hexane are used as solvents for contact cement, varnishes, and inks.

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The percent by mass of nitrogen in ammonia (NH3) is approximately 82.15%

Calculating the mass of nitrogen to the total mass of the compound and then expressing the result as a percentage will allow us to determine the percent by mass of nitrogen in NH3 (ammonia).

Ammonia's molecular structure, NH3, indicates that it is made up of one nitrogen atom (N) and three hydrogen atoms (H). We must take both the molar masses of nitrogen and ammonia into account when calculating the percent by mass of nitrogen.

Nitrogen's (N) molar mass is roughly 14.01 g/mol. The molar masses of nitrogen and hydrogen are added to determine the molar mass of ammonia (NH3). Since hydrogen's molar mass is around 1.01 g/mol, ammonia's molar mass is:

(3 mol H 1.01 g/mol) + (1 mol N 14.01 g/mol) = 17.03 g/mol = NH3.

Now, we can use the following formula to get the nitrogen content of ammonia in percent by mass:

(Mass of nitrogen / Mass of ammonia) / 100% is the percentage of nitrogen by mass.

Ammonia weighs 17.03 g/mol and contains 14.01 g/mol of nitrogen by mass. By entering these values, we obtain:

(14.01 g/mol / 17.03 g/mol) 100% 82.15 % of nitrogen by mass

Ammonia (NH3) has a nitrogen content that is roughly 82.15 percent by mass.

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Answer:

hope this helped :( got this from my friend a long time ago but still not sure if it's really correct this

Here is the correct question.

Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons.

NF3

SBr2

CCl4

Answer:

Explanation:

The objective here is to draw the molecule three molecules by placing atoms on the grids and connecting them with their respective bonds, therefore including all the lone pairs of electrons.

See the attachment below for the diagrams.

The first compound is know as Nitrogentrifluoride. A non-flammable greenhouse gas. It is majorly used for he production of semi conductors. It has a trigonal planar structure.

SBr2: Sulfur dibromide is a yellowish liquid toxic gas. It results as a reaction between SCl_2 and HBr. Its has a Bent Structure.

CCl_4 : carbon tetrachloride has the presence of a colourless liquid with a sweet smell. Carbon tetrachloride is used for different domestic uses such as: cleaning surfaces, fumigating, cleaning metals etc. It has a tetrahedral structure.

Answer:

i

Explanation:

Answer:1

Explanation:v

Answer:

Salt domes storage has advantages in cost, security, environmental risk, and maintenance. Salt formations offer the lowest cost, most environmentally secure way to store crude oil for long periods of time. Stockpiling oil in artificially-created caverns deep within the rock-hard salt costs historically about $3.50 per barrel in capital costs. Storing oil in above ground tanks, by comparison, can cost $15 to $18 per barrel - or at least five times the expense. Also, because the salt caverns are 2,000-4,000 feet below the surface, geologic pressures will sea; any crack that develops in the salt formation, assuring that no crude oil leaks from the cavern. An added benefit is the natural temperature differential between the top of the caverns and the bottom - a distance of around 2,000 feet; the temperature differential keeps the crude oil continuously circulating in the caverns, giving the oil a consistent quality.

The molarity of the aqueous solution containing 4.00% sodium hypochlorite (NaOCl) by mass is 0.000547 M.

The molarity of a solution is a measure of the concentration of the solute in the solvent, and is calculated by dividing the moles of solute by the liters of solution. In this case, the solute is sodium hypochlorite (NaOCl) and the solvent is water.

To calculate the molarity of the solution, we first need to determine the number of moles of sodium hypochlorite in 1 liter of the solution. The mass of sodium hypochlorite in 1 liter of the solution is equal to 4.00% of 1.02 g/mL, or 0.0408 g. We can then use the molar mass of sodium hypochlorite (74.44 g/mol) to calculate the number of moles in 0.0408 g, which is 0.000547 moles.

Now that we know the moles of sodium hypochlorite in 1 liter of the solution, we can calculate the molarity by dividing this number by the liters of solution:

Molarity = 0.000547 moles / 1 liter

Molarity = 0.000547 M

Therefore, the molarity of the aqueous solution containing 4.00% sodium hypochlorite (NaOCl) by mass is 0.000547 M.

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Chlorofluorocarbons (CFCs) are man-made chemicals containing chlorine and fluorine that cause ozone molecules to break down. Thus, option B is the answer.

Chlorofluorocarbons are non-toxic, synthetic compounds that contain atoms of Chlorine, Fluorine and Carbon. They are commonly used in the manufacture of aerosol sprays and are also used as solvents and refrigerants. CFCs were first introduced in 1928 by General Motors Company for its refrigerators.

While CFCs are very safe to use in most applications and are stable in the lower atmosphere, these chemicals when released to the upper atmosphere can cause significant reactions. CFCs when released into the upper atmosphere can lead to the destruction of the ozone molecules followed by the release of the UV radiation into the atmosphere.

Thus, CFCs are man-made chemicals which cause ozone molecules to break down.

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Explanation:

"Compound: A substance that is made up of more than one type of atom bonded together. 

Mixture: A combination of two or more elements or compounds which have not reacted to bond together; each part in the mixture retains its own properties."

- Libre Texts

Click on the photo to view full solution

The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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Answer:

We actually output other gases like methane lol

Explanation:

Well since most of the air we breathe is made up of nitrogen we also breathe out nitrogen

Source: da brain

Hope this helps you! :)

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It would help me a lot!

Thank you!

Answer:

our body needs oxygen for certain processes in the body .When the work is done oxygen is transformed into carbon dioxide .So, oxygen is inhaled while carbon dioxide is exhaled.