A balance and a graduated cylinder are used to determine the density of a mineral sample.

The sample was measured on the balance at 15.4 g.

The graduated cylinder began with 20 mL of water and measured 22.8 mL of water after the sample was placed into the graduated cylinder.



Density = mass / volume



What is the density of the mineral sample?

Na has greater polarizability than Na+.

CH3CH2COOH has greater polarizability than CH3COOH.

BCl3 has greater polarizability than BF3.

Polarizability refers to the ability of an atom or molecule to undergo distortion of its electron cloud in the presence of an electric field. Generally, larger atoms or molecules with more diffuse electron clouds have greater polarizability.

Na+ or Na: Na+ is a cation, which means it has lost an electron compared to the neutral Na atom. Since Na+ has a smaller electron cloud, it has lower polarizability compared to Na.

CH3COOH or CH3CH2COOH: CH3CH2COOH (acetic acid) has greater polarizability than CH3COOH (ethyl acetate). The additional ethyl group in CH3CH2COOH increases the size and electron cloud of the molecule, making it more polarizable.

BCl3 or BF3: BCl3 (boron trichloride) has greater polarizability than BF3 (boron trifluoride). Chlorine (Cl) atoms are larger than fluorine (F) atoms, resulting in a larger electron cloud and higher polarizability for BCl3 compared to BF3.

Na has greater polarizability than Na+. CH3CH2COOH has greater polarizability than CH3COOH. BCl3 has greater polarizability than BF3.

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A liquid is allowed to evaporate and leaves no residue. It can not be determined whether it was an element, a compound, or a mixture.

A water vapor molecule stays roughly 10 days in the atmosphere after it has evaporated. Water vapor starts to cool back down as it ascends higher in the atmosphere. The water vapor condenses when it becomes cold enough, turning it back into liquid water. Eventually, individual water droplets will condense to create clouds and precipitation.

It is not possible to determined whether it would be an element, a compound and mixture because the size of the particle will be too less.

A method for separating homogenous mixtures with one or even more dissolved salts is called evaporation. The procedure separates the liquid from the solid components. Usually, the procedure entails heating the combination until there is no more liquid is present.

Therefore, it can not be possible to determined whether it was an element, a compound, or a mixture by evaporation.

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Answer:

I believe the answer is the last one answer D: Neutral elements

Explanation:

Ionic bonds are formed through the exchange of valence electrons between atoms, typically a metal and a nonmetal. ... Ionic compounds are typically neutral. Ionic compounds generally form between elements that are metals and elements that are nonmetals.

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Answer:

i got a new padlit

Explanation:

Oxaloacetate contains 4 carbons. Acetyl-CoA contains 2 carbons in its acetyl group. Citric acid contains 6 carbons. In the first reaction of the citric acid cycle, acetyl-CoA combines with oxaloacetate to form citrate.

The acetyl group of acetyl-CoA is transferred to oxaloacetate, and a molecule of CoA is released. The resulting citrate molecule has 6 carbons. The citric acid cycle is a series of chemical reactions that occur in the mitochondria of cells. The cycle is responsible for the oxidation of acetyl-CoA, which produces energy in the form of ATP. The cycle also produces NADH and FADH2, which are used in the electron transport chain to produce more ATP. The citric acid cycle is a critical part of cellular respiration, and it is essential for the production of energy.

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"One possibility is that the battle between the virus and your immune system can take as long as two weeks.

It could be the immune system holds the virus at bay,” said Tompkins.

Or, your immune system has to work so hard that after two weeks it’s inflamed and that’s what makes you feel bad.

When the waters are extremely oligotrophic  the carbon-14 method of determining primary productivity preferred over the oxygen bottle method

The light/dark bottle is a method for comparing dissolved oxygen concentrations before and after primary production. Bottles containing seawater tests with phytoplankton are brooded for a foreordained timeframe under light and dim circumstances.

To quantify complete essential efficiency, analysts frequently utilize the light-dim jug method. Since oxygen is produced during photosynthesis and used in respiration, this method uses changes in the concentration of dissolved oxygen to measure both processes.

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Answer:

Explanation:

Both elements and compounds are classified as pure substances. A pure substance is defined as a material that has a constant composition and fixed properties. Pure substances cannot be separated using physical separation techniques.

Elements are the simplest pure substances. They cannot be broken down or separated by any means, excluding nuclear fission and fusion. Most elements have been found naturally in the universe, most having been formed during the evolution of the universe, in the Big Bang. One example is iron (Fe), formed naturally during the fusion of stars.

Compounds are composed of elements in fixed atomic ratios and can be separated into component elements by chemical means. Examples include Silver bromide (AgBr), which can be separated into silver and bromine by photolytic decomposition (light); sodium chloride can be separated into sodium and chlorine by electrolytic decomposition (electricity); hydrochloric acid can be separated into chlorine upon reaction with water.

Answer:

Hcl Answer

Explanation:

may be this helpful!

Answer

moles = 5.81 mol

Explanation

Given:

Volume = 144 L

AT SATP

1 mole = 24.4651 L

Solution:

1 mole = 24.4651 L

x mole = 144 L

x = 144/24.4651

x = 5.8 mol

Answer:

Explanation:

For amount of radiation from a hot body there is Stefan's Boltzman's law which is given below .

E = e σ T⁴

E is amount emitted , e is emissivity , σ is stefan's constant = 5.67 X 10⁻⁸ W / m² . for earth e =.85 approx

E = .85 x 5.67 X 10⁻⁸ x T⁴

604 = .85 x 5.67 X 10⁻⁸ x T⁴

604 = 4.82 x 10⁻⁸ T⁴

T⁴ = 125.31 x 10⁸

T =  3.3457 x 10²

= 334.57K

Temperature in Celsius = 334.57 - 273

= 61.57 Celsius .

Ba(NO3)2 will form a precipitate when mixed with an aqueous solution of sodium sulfate (Na2SO4)

Barium Nitrate Crystals, When each of these is combined with sodium sulfate, one of the results is sodium nitrate, and the other is the positive/metal ion with sulfate. To make a precipitate (solid/insoluble), we need to look for the positive ion that goes with sulfate. The Solubility Rules may be found on page 6 of the Reference Tables.

Calcium sulfate, strontium sulfate, barium sulfate, mercury sulfate, lead (II) sulfate, and silver sulfate are the only insoluble sulfates. Because its positive ion is barium, the answer must be , Barium nitrate is the inorganic compound with the chemical formula Ba(NO3)2. It, like most barium salts, is colorless, toxic, and water-soluble.

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The velocity of a medicine ball is 1.33 × 10-35 m/s².

This refers to the space between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated win area or along a wire.

Wave is characterized by frequency, wavelength, amplitude, and velocity. When the frequency is constant the wavelength is directly proportional to velocity.

Hence,

Velocity, V ∝ wavelength, λ

Mass,m = 10.0 kg

the wavelength, λ =1.33 × 10-35 m.

Thus,

Assuming constant frequency,

Velocity, V ∝ wavelength, λ

velocity, V= 1.33 × 10-35 m/s²

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Answer:

Chemistry Q&A Library decide which element probably forms a compound with chlorine that has a chemical formula most and least similar to the chemical formula of the compound formed by chlorine and magnesium most and least similar to magnesium:strontium,rubidium,phosphorus, cesium

Explanation:

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The structure of the molecule is CH₃-CH₂-CH₂-C(=O)-CH-(CH₃)₂. The IUPAC name of the molecule is propan-2-yl butanoate.

The formula provided is C₇H₁₄O₂. An alkene consisting of 7 carbon atoms has the formula C₇H₁₆. Since there are two hydrogen atoms missing from the given formula, we can estimate that there exists a double bond in the structure.

Since a strong signal is received at 1720 cm⁻¹, it is conclusive proof of a carbonyl group (C=O) being present.

The peaks and tentative assignments for the 1H NMR has been attached in the document below.

The typical patterns that can be deciphered from the analysis are:

1H:6H doublet-septet = -CH(CH₃)₂

3H doublet = CH₃CH₂-

2H doublet = -CH₂CH₂

Then, on analyzing the spectrum accounts for the available seven carbon atoms (table attached in document below),

We can confirm that the compound is isopropyl butyrate or as its IUPAC name is propan-2-yl butanoate.

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Complete question: A compound with molecular formula C7H14O2 displays the following 1H NMR and 13C NMR spectra. An ir of this same compound shows a strong signal at 1720 cm-1. based on this information, determine the structure of this molecule. what is the iupac name of the molecule? The image is attached below.

ANSWERrrrrrrrrrrr:

A chemical bond is the physical phenomenon of chemical substances being held together by attraction of atoms to each other through sharing, as well as exchanging, of electrons -or electrostatic forces.

Explanation:

The catalyst BamH1 will cut the DNA as follows:

Species A: AATTG | GCCTAATTAATTCG | GCCTAG

Species B: AATTCCTACG | GCCTAGCCTTTAATT

Restriction endonucleases or restriction enzymes are enzymes that cleave DNA into pieces at or close to particular recognition regions inside molecules called restriction sites.

EcoRI, BamH1, and smaI are some examples of restriction endonucleases.

BamHI is a type II restriction enzyme that recognizes the DNA sequence "GGATCC" and cuts the DNA at in between G and G.

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The increasing pH of an ocean is not enough to restore the equilibrium as seawater becomes more acidic, and the pH of the water drops. This process binds carbonate ions, reducing their abundance.

Equilibrium is a state where the presence of base and acid is in equal quantity.

Increased pH, leads to more acidity and reduces the number of ions.

Ions are necessary for corals, oysters, mussels, and many other shelled organisms that require building their shells and skeletons.

Thus, increasing pH of an ocean is not enough to restore the equilibrium as seawater becomes more acidic, and the pH of the water drops. This process binds carbonate ions, reducing their abundance.

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Answer:

How do one confess feelings to her if he is introvert?

Answer:

A) The substance is in the gas phase only in "region 5".

B) The substance is in both the liquid and solid phase in "region 2"

C) The substance is only in the liquid phase in "region 3".

D) The melting point is the temperature at "region 2".

E) The boiling point is the temperature at "region 4".

Explanation:

The graph is a graph of the solid, liquid, vapour phase change diagram.

In phase 1, the substance is ice which is the solid phase.

In phase 2,it undergoes melting in a forward reaction.

In phase 3, the melting from phase 2 has now changed to water which is liquid phase.

In phase 4, the substance is undergoing a forward reaction known as evaporation.

In phase 5, the evaporation from stage 4 will turn the liquid into vapour known as the gas phase.

A) The substance is in the gas phase only in "region 5".

B) The substance is in both the liquid and solid phase in "region 2"

C) The substance is only in the liquid phase in "region 3".

D) The melting point is the temperature at "region 2".

E) The boiling point is the temperature at "region 4".

The change of state of a substance occurs when heat is either added or removed from the substance.

Change of state is a process in which a substance changes from one state of matter to another due to heat changes.

From the graph given:

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Answer:

argon

Explanation:

Answer:

Argon

Explanation:

What are the answers? I assume you meant to attach a photo.

Answer:

Thus, the one that is an example of mimicry that enables prey species to avoid predation is a harmless organism imitating the look of a harmful one (option B).

Explanation:

When using the liquid-based method for the collection of a specimen for a pap test, plastic fronded broom is used

The Pap test (or Pap smear) looks for pre cancers, cell changes on the cervix which may become cervical cancer if they are not treated appropriately. The HPV test looks for the virus (human papillomavirus) which will cause these cell changes.

If the results of your Pap test come back positive, meaning your doctor found abnormal or unusual cells on your cervix. It doesn't suggest you have cervical cancer. most frequently , the abnormal test result means there are cell changes caused by the human papilloma virus (HPV).

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The density of ethylene glycol is approximately 1128 kg/m3, based on the given information about the density of the mixture and the density of water.

To find the density of ethylene glycol, we can use the given information about the density of the mixture and the density of water.

Let's denote the density of ethylene glycol as ρ_eg.

The density of the mixture can be calculated using the volume fractions of water (\(V_water\)) and ethylene glycol (\(V_eg\)) in the mixture:

Density of the mixture = (\(V_water\) * density of water) + (\(V_eg\) * density of ethylene glycol)

Given that the mixture is 50% water and 50% ethylene glycol, the volume fractions can be expressed as:

\(V_water\) = 0.50

\(V_eg\) = 0.50

Substituting the values into the equation:

1064 kg/m³ = (0.50 * 1000 kg/m³) + (0.50 * ρ_eg)

Simplifying the equation:

1064 kg/m³ = 500 kg/m³ + 0.50 * ρ_eg

Subtracting 500 kg/m³ from both sides:

564 kg/m³ = 0.50 * \(\rho_\text{eg}\)

Dividing both sides by 0.50:

\(\rho_\text{eg} = 564 \frac{\text{kg}}{\text{m}^3} \div 0.50\)

\(\rho_\text{eg}\) ≈ 1128 kg/m³

Therefore, the density of ethylene glycol is approximately 1128 kg/m³.

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the particular gas effusion was 21.0. and the methane effusion rate is 47.0 The molar mass of the unknown gas is approximately 28.6 g/mol

The process through which a gas manages to escape through with a small hole or highly permeable barrier is known as effusion. A gas's rate of effusion is inversely proportional to its molar mass squared. The following equation describes this relationship: rate1 / rate2 = (sqrt(molar mass2) / sqrt(molar mass1)). where rate1 and rate2 are the rates of effusion of the two gases and molar mass1 and molar mass2 are the molar masses of the two gases.Given the rate of effusion of the unknown gas is 21.0 mL/min, and the rate of effusion of pure methane (CH4) is 47.0 mL/min, we can use the above equation to find the molar mass of the unknown gas:

(21.0 mL/min) / (47.0 mL/min) = sqrt(molar mass unknown) / sqrt(16.04 g/mol)

Squaring both sides of the equation, we get:

(21.0 mL/min)^2 / (47.0 mL/min)^2 = (molar mass unknown) / (16.04 g/mol)

Solving for molar mass unknown we get:

molar mass unknown = (16.04 g/mol) * (21.0 mL/min)^2 / (47.0 mL/min)^2

The molar mass of the unknown gas is approximately 28.6 g/mol

Please note that the above calculation is based on the assumption that the temperature and pressure are the same for both gases and that the gases are ideal

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Liquids fuels that have a flash point of less than 100°F (38°C) are generally classified as flammable liquids.

These fuels have a low flash point, which is the lowest temperature at which they can emit flammable vapors that can ignite when exposed to an ignition source.

The low flash point indicates that these liquids have a high volatility and are more prone to catch fire or explode.

Some examples of liquid fuels with a flash point below 100°F (38°C) include:

Gasoline:

Gasoline is a commonly used fuel for automobiles, and it has a relatively low flash point, typically around -45°F (-43°C) to -40°F (-40°C).

Ethanol:

Ethanol is a biofuel produced from renewable resources such as corn or sugarcane.

It is often blended with gasoline and has a flash point of about 55°F (13°C).

Methanol:

Methanol is another type of alcohol-based fuel that has a flash point of approximately 52°F (11°C).

It is used as a racing fuel and in certain industrial applications.

Diesel fuel:

Diesel fuel typically has a flash point higher than gasoline but still falls within the flammable liquid category.

The flash point of diesel fuel can vary depending on the specific formulation and can range from around 100°F (38°C) to 150°F (66°C).

It's important to handle and store flammable liquids with caution, following proper safety protocols to minimize the risk of fire or explosion.

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To solve this problem, let's use the definition for molarity:

Replacing the values of the problem:

Now, to find the mass, we multiply by the molecular weight of NaCl. (Which is about 58.44g/mol)

The answer is approximately 22.2g of NaCl

As temperature increases, vapor pressure of substance also increases due to an increase in  kinetic energy of the molecules. The correct answers are options: 1, 2, 3, 4.

As temperature increases, vapor pressure of a substance also increases due to an increase in  kinetic energy of molecules Substances with stronger intermolecular forces will have lower vapor pressure because it requires more energy to break bonds between molecules and transition into  gas phase. An increase in external pressure will decrease  vapor pressure. Molecular size and shape of a substance can affect intermolecular forces and therefore its vapor pressure. For example, larger molecules tend to have stronger intermolecular forces, which result in lower vapor pressures. Options are 1, 2, 3, 4  correct .

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--The complete Question is, which of the following will affect the vapor pressure of a pure molecular substance?

select all that apply.

1. the external pressure

2. the structure of the substance

3. the strength of the intermolecular forces

4. the temperature

5. the weather conditions--

Answer:

The major natural causal agent for acid rain is volcanic emissions. Volcanoes emit acid-producing gases to create higher than normal amounts of acid rain or any other form of precipitation such as fog and snow to an extent of affecting vegetation cover and health of residents within the surrounding.