Aloud is an astronomer. He is trying to find evidence that a galaxy has supermassive black hole at its center. What should he look for? A. Neutron star B quasar C pulsar D black matter

Answer:

Option 2

Explanation:

Gasoline, rubber, and plastics all use alkane, alkene, and alkyne, respectively. Examples of alkanes include methane (CH4) and ethane (C2H6). Alkenes include substances like propane (C3H8) and ethene.

Alkanes are saturated hydrocarbons in nature. Saturated hydrocarbons are alkanes with only one atom in the chemical structure. The formula for an alkane is CnH2n+2. Methane, butane, propane, and ethane are the four alkanes.

The simplest alkane molecule, methane, is made up of one carbon atom and four covalently bound hydrogen atoms. The compounds were detected as the methyl compound is created when we swap out one hydrogen atom for another atom or molecule.

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Answer:In a chemistry experiment, 10g of urea, NH2CONH2 (s), is dissolved in 150 mL of water in a simple calorimeter. A temperature decrease of 3.7oC is measured. Calculate the molar enthalpy of solution (∆Hs). ... an ideal gas B if 0.622 g sample of gas B occupies a volume of 300 mL at 35 °C and 1.038 atm.

Explanation:

Answer:

4d¹ electron has quantum numbers

n=4; l=2; ml= -2; ms= 1/2

Explanation:

There are 4 quantum numbers, namely

the principal quantum number (n)

the orbital angular momentum quantum number (l)

the magnetic quantum number (ml)

the electron spin quantum number (ms)

The principal quantum number describes the orbit or shell of the electron

here n = 4 ⇒ electron is in 4th shell

the orbital angular momentum quantum number describes the shape of orbital the electron is present in.

l= 0 ⇒ s-orbital

l= 1 ⇒ p-orbital

l= 2 ⇒ d-orbital

l= 3 ⇒ f-orbital

In our case l= 2 ⇒ p-orbital

ml specifies in which orbital electron is present of given shape

ml has 2l+1 values,which range from -1 to +l

here l = 2 ⇒ ml has 2(2)+1 = 5 values (-2 to +2)

so electron is present in one of the five d-orbitals

ms represents the spin of electron (+1/2 or -1/2)

If  +1/2 represents clockwise then -1/2 represents anti-clockwise and vice-versa.

⇒  4d¹ electron has quantum numbers

n=4; l=2; ml= -2; ms= 1/2.

Hope this helped!

The diagram shows a picture of a compound.

A compound is a substance that is made up of two or more different elements that are chemically bonded together in a specific ratio.

This means that the elements are combined in a way that creates a new substance with different physical and chemical properties than the individual elements.

Compounds can be formed through a variety of chemical reactions, such as combining elements through a chemical bond or through a reaction between an acid and a base.

So for the given diagram, we can see that it represents two or more elements chemically combined.

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Volume of the balloon at 2.00 × 10⁴ m is 1.52x10³ L

Volume is the three dimensional qualities that is used to measure capacity of solid shape and atmospheric pressure is the air around you has weight and it weighs down everything it touches is called atmospheric pressure

Here given data is

Pi = 1.0 atmosphere = absolute atmospheric pressure

P f = 61.0 mm Hg = atmospheric pressure

= 61.0/760 atmosphere

=  0.0802 atmosphere

Vi =  171 L

T i = 20.0°C = 20+273 = 293 K

T f = 210 K

We have to find volume of the balloon at 2.00 ×10⁴ m =?

Then the formula is

Pi × Vi/T i = P f × V f/T f

1 atm×171 L/293 K = 0.0802× V f/210K

V f = 1.52x10³ L

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Answer:

15 cents where im from

Explanation:

Density differences caused by temperature and salinity variations are fundamental drivers of ocean currents of seawater . Warm currents transport heat from the equator to higher latitudes, while cold currents transport cold water from higher latitudes to lower latitudes.

When seawater is heated, it expands and becomes less dense, causing it to rise. Conversely, when seawater cools, it contracts and becomes denser, causing it to sink. These density differences due to temperature variations create vertical movements in the ocean known as thermohaline circulation or convection currents. On the other hand, regions with high freshwater input from rivers or heavy precipitation have lower salinity, resulting in lower density. This lighter water tends to float on the denser seawater beneath it, leading to the formation of surface currents that transport water from areas of low salinity to areas of higher salinity. These ocean currents play a vital role in shaping global climate patterns and maintaining the balance of heat and nutrients in the ocean ecosystem.

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Answer:

70

Explanation:

20 x 5 vials = 100mg

therefore 5 vials required each day.

Two weeks = 14 days

14 days x 5 vials = 70 vials

Answer:

Temperature causes water molecules to move more quickly, because each individual molecule has more energy as it gets hotter. If you get water hot enough, the molecules move so much that the hydrogen bonds that hold them together start to break and the water becomes a gas.

The empirical formula of the compound is Iridium:Oxygen = 1:2 or IrO2.

The empirical formula of a compound is the simplest whole number ratio of its elements.

To find the empirical formula of this compound, we first need to convert the masses of Iridium and Oxygen to moles.

The molar mass of Iridium is 192 g/mol, so the number of moles of Iridium is:

1.26 g / 192 g/mol = 0.006562 mol

The molar mass of Oxygen is 16 g/mol, so the number of moles of Oxygen is:

0.210 g / 16 g/mol = 0.013125 mol

Next, divide each mole value by the smallest mole value (0.006562 mol), to get the mole ratio of the elements:

Iridium: 0.006562 mol / 0.006562 mol = 1

Oxygen: 0.013125 mol / 0.006562 mol = 2

So, the empirical formula of the compound is Iridium:Oxygen = 1:2 or

IrO2.

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Answer:

Explanation:

If an antacid has sodium hydrogen carbonate/Calcium carbonate, it reacts with HCl as shown

NaHCO₃+ HCl → NaCl + CO₂+ H₂O

Antacid acid salt gas water

CaCO₃+ 2HCl → CaCl₂+ CO₂+ H₂O

Antacid acid salt gas water

The formation of gas CO₂ is shown by brisk effervescence when the antacid (sodium hydrogen carbonate/calcium carbonate) reacts with HCl (acid). So CO₂ is the additional product formed and its formation is supported by observation of brisk effervescence as HCl is added to the antacid.

Answer:B

Explanation:

Maybe

Answer:B is correct

Explanation:

The mass of brass in the cylinder is approximately 5.39 grams.

The first step is to calculate the volume of the cylinder:

V = πr^2h

Where

r = 0.49 in / 2 = 0.245 in

V = π(0.245 in)^2(0.7 in) ≈ 0.039 in^3

Next, we need to use the concept of weighted density to calculate the density of the brass. We can assume that the density of brass varies linearly with the composition of copper and zinc. The density of brass can be expressed as:

ρ_brass = ρ_copper × % copper + ρ_zinc × % zinc

Where

We are given that brass is 73% copper, so % copper = 0.73 and % zinc = 0.27. Substituting the given values:

ρ_brass = 8.86 g/mL × 0.73 + 7.62 g/mL × 0.27 ≈ 8.31 g/mL

Finally, we can use the density formula to calculate the mass of the brass cylinder:

m = ρV

m = 8.31 g/mL × 0.039 in^3 × (1 mL / 0.0610237 in^3) ≈ 5.39 g

Therefore, the mass of brass in the cylinder is approximately 5.39

grams.

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Sedimentation, filtration, and coagulation are the treatments that will help remove contaminants from minerals or from the pipes carrying water from a source.

Sedimentation is a process in which suspended particles settle out of water. It is one of the most basic techniques for removing particles from water. As particles settle, they become trapped in the bottom of a container or settle to the ground in an outdoor setting

Filtration is a method of removing particles from a fluid. It is a physical or chemical separation method that separates solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass.

Coagulation is the process of using chemicals to remove contaminants from water. By creating a chemical reaction, coagulation destabilizes particles and causes them to clump together. This helps to remove the contaminants from the water.

Disinfection is the process of eliminating or destroying pathogens that cause infection. Disinfection eliminates harmful microorganisms by destroying or inactivating them. The disinfectant is a chemical or physical agent that is used to destroy or inactivate harmful microorganisms.

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Answer:

sulphuric acid

nitric acid

carbolic acid

The ionic compounds contribute to climate change that is sulphuric acid, nitric acid and carbolic acid.

Ionic compounds were made up of ions kept together by the attraction of positive and negative ions. One of the most well-known ionic compounds is common salt (sodium chloride). Molecular compounds were made up of distinct molecules that also are kept together through electron sharing (covalent bonding).

Long-term variations in temperature but also weather systems are referred to as climate change.

Therefore, the ionic compounds contribute to climate change that is sulphuric acid, nitric acid and carbolic acid.

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Explanation:

Hope u can understand my handwriting:)

The event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

The sand mass of dunes can move either windward or leeward, depending on if the wind is making contact with the dune from below or above its apogee.

If wind hits from above, the sand particles move leeward; the leeward flux of sand is greater than the windward flux.

Thus, the event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

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Answer:

0.86

Explanation:

1mol of Zn has mass of 65.39g.The amount of Zn is 2.5g65.39g/mol=0.038mol.

The amount of H2 produced is the same as the amount of Zn consumed (0.038mol).

1mol of ideal gas will occupy 22.4L at STP.

The H2 will occupy 0.038mol×22.4L/mol=0.86L

.

The empirical formula of polyethylene can be determined by converting the given percentages of carbon (C) and hydrogen (H) into grams. To find the grams of each element, we assume a 100.0 g sample of polyethylene.

For carbon:

Mass of carbon = 86.0% × 100.0 g = 86.0 g

For hydrogen:

Mass of hydrogen = 14.0% × 100.0 g = 14.0 g

Therefore, in a 100.0 g sample of polyethylene, there are 86.0 grams of carbon and 14.0 grams of hydrogen.

The empirical formula of a compound represents the simplest whole-number ratio of atoms present in the compound. To determine the empirical formula, we need to find the ratio of carbon to hydrogen in terms of moles.

First, we convert the masses of carbon and hydrogen into moles using their respective molar masses. The molar mass of carbon is approximately 12.01 g/mol, and the molar mass of hydrogen is approximately 1.008 g/mol.

Number of moles of carbon = 86.0 g / 12.01 g/mol ≈ 7.162 mol

Number of moles of hydrogen = 14.0 g / 1.008 g/mol ≈ 13.89 mol

Next, we divide the number of moles of each element by the smallest number of moles to get a simplified ratio.

Carbon: Hydrogen ≈ 7.162 mol : 13.89 mol ≈ 1 : 1.939

Since we want to express the ratio in whole numbers, we multiply both sides by 2 to get a whole number ratio.

Carbon: Hydrogen ≈ 2 : 3.878

Rounding to the nearest whole number, we find that the empirical formula of polyethylene is CH₂.

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"Sam is being a good digital citizen by following a code of conduct.

A code of conduct is a set of rules that govern how people should behave online. It is important to follow a code of conduct because it helps to create a safe and respectful environment for everyone.

Here, Sam is following the code of conduct for his gaming group. This code of conduct may include rules about using offensive language, cheating, and griefing. By following these rules, Sam is helping to create a positive experience for everyone in his gaming group.

Therefore, Sam is following the code of conduct.

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The answer is 3,294,000 m/h.

Explanation: There are 3,600 seconds in an hour, so you would multiply 915 by 3,600.

To convert the speed from m/s to mph, multiply the speed in m/s by the conversion factor of 2.23694.

To convert the speed from meters per second (m/s) to miles per hour (mph), you can use the conversion factor of 2.23694. Multiply the speed in m/s by this conversion factor to get the speed in mph.

Let's calculate the speed in mph:

Speed in m/s = 915.0 m/s
Conversion factor = 2.23694

Speed in mph = 915.0 m/s x 2.23694 = 2044.3437 mph

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The correct options that apply during a chemical change are:

A) One atom or more changes into atoms of another element.

B) New substances with different properties are formed.

C) Solids, liquids, or gases may form. Option A, B and C

During a chemical change, the arrangement of atoms in molecules is altered, resulting in the formation of new substances with different chemical properties. This is represented by option B. For example, when hydrogen gas (H₂) reacts with oxygen gas (O₂), a chemical change occurs, and water (H₂O) is formed. The properties of water, such as boiling point, density, and chemical reactivity, are distinct from those of its constituent elements.

Additionally, during a chemical change, atoms can rearrange to form molecules of different elements, as indicated in option A. For instance, during a nuclear reaction, such as radioactive decay, the nucleus of an atom can change, leading to the formation of atoms of different elements.

Option C is also correct. Depending on the specific reaction conditions, chemical changes can result in the formation of solids, liquids, or gases. For example, when a metal reacts with an acid, such as zinc with hydrochloric acid, a gas (hydrogen) is produced.

Options D and E are not universally applicable to all chemical changes. While some reactions may release heat energy (exothermic reactions), others may absorb heat energy (endothermic reactions). The requirement for heating or the release of heat depends on the specific reaction and its energy considerations.

In summary, during a chemical change, atoms can change into atoms of another element (A), new substances with different properties are formed (B), and solids, liquids, or gases may form (C).

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ANSWER

EXPLANATION

Single replacement reaction is a type of reaction in which one element is substituted for another element in a compound.

Hence, we have the below reaction as one of the the examples of a single replacement reaction

In the above reaction, the hydrogen atom displaced the copper atom in CuO. This is because hydrogen is more reactive than copper in the activity series chart.

The properties of a natural resource that make it useful for humans as a material or energy source is the ability to convert mass into energy and vice versa.

The expression natural resources make reference to all types of matter and energy extracted from nature that can be used to produce goods and services.

Some examples of natural resources include for example irreversible resources such as fossil fuels (i.e., oil, or coal, gas, minerals such as metals, rocks, etc) as well as those based on the use of reversible energy such as eolic air energy, solar radiation or sunlight, soil and hydric resources or water.

Therefore, with this data, we can see that natural resources can be defined as any material and or energy obtained from nature that may be irreversible or reversibly used to produce goods and services.

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The final volume of the system, given that half of the gas is removed, leaving 0.50 mole in the cylinder and the system is warmed to 900 K is 18.45 liters

From ideal gas equation, we have

PV = nRT

Rearrange

V / nT = R/ P

R / P = Constant

Thus, we have

V₁ / n₁T₁ = V₂ / n₂T₂

Where

With the above formula, we can obtain the final volume of the system as follow:

V₁ / n₁T₁ = V₂ / n₂T₂

12.3 / (1 × 300) = V₂ / (0.5 × 900)

Cross multiply

1 × 300 × V₂ = 12.3 × 0.5 × 900

300 × V₂ = 5535

Divide both side by 300

V₂ = 5535 / 300

V₂ = 18.45 liters

Thus, the final volume of the system is 18.45 liters

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can't give an answer to your question if there isn't a picture or being specific in the question.

Answer: 2 Out of 4

Explanation:

Bc my mom told me