Samples of different materials, A and B, have the same mass, but the sample
of A is higher in density. Which statement could explain why this is so?
A. The sample of material A has greater volume than the sample of
material B.
B. The particles that make up material B are more closely packed
together than the particles that make up material A.
C. The particles that make up material A have more mass than the
particles that make up material B.
D. The particles that make up material B have more mass than the
particles that make up material A.
SUBMI

Answer:

Composition: All hydrocarbons are made up of only two types of atoms: carbon and hydrogen. They are like building blocks that contain carbon and hydrogen stuck together.

Organic Nature: Hydrocarbons are special because they are part of a group of compounds that come from living things or things that were once alive. They have carbon and hydrogen in them, which is what makes them different from other types of compounds.

Explanation:

we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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Answer:

proton = 75

electron = 75

neutron = 75

Explanation:

because

proton = electron = atomic number

neutron = mass number - proton

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The learning activities titled "Hypothesis," "Variables and Hypothesis," and "Constructing a Hypothesis" all share certain similarities and differences. A question that arises in response to an observation is similar to a scientific research question in that both require some level of investigation to achieve an answer. However, scientific research questions are typically more specific and refined, with a defined methodology for obtaining data and verifying results.

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Answer:

The pH at the midpoint in the titration of an acid with a base is

A) equal to the pK of the corresponding base.

B) equal to the pK of the corresponding acid.

C) equal to 14 minus the pK of the corresponding acid.

D) equal to 14 plus the pK of the corresponding base.

E) none of the above

Explanation:

When a weak acid is titrated with a strong base, then a buffer solution is formed.

pH of a buffer solution can be calculated by using the formula:

\(pH=pKa+log\frac{[salt]}{[acid]}\)

Exactly at the mid point,

[conjugate base of the salt]=[acid]

So, log [salt]/[acid] =0

Hence, pH of the solution will be equal to pKa of the weak acid.

Answer is option B.

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

Step 1

The reaction provided:

2 C4H10 + 13 O2 = 8 CO2 + 10 H2O (completed and balanced)

------------

Step 2

Information provided:

100 g of butane (C4H10)

----

Information needed:

The molar masses of:

C4H10) 58.12 g/mol

CO2) 44.01 g/mol

(the periodic table is helpful here)

------------

Step 3

By stoichiometry,

2 C4H10 + 13 O2 = 8 CO2 + 10 H2O

2 x 58.12 g C4H10 ------------ 8 x 44.01 g CO2

100 g C4H10 ------------ X

X = 100 g C4H10 x 8 x 44.01 g CO2/2 x 58.12 g C4H10

X = 303 g approx.

Answer: 303 g of CO2 produced

Answer:

C) 96 g/100 g water

Explanation:

If you look for 80°C in x axis and move up from their until you hit the line for KBr, you will see that you hit the KBr line b/w (90-100 in y-axis) thus the closest answer is  C) 96 g/100 g water

Hamilton explained the choice on the On Purpose show, admitting that the pair's work connection from karting to F1 had placed a burden on an otherwise strong friendship.

Lewis Hamilton now has a close connection with his father Anthony, but this was not always the case during his Formula One tenure. Anthony had a significant influence on his son's career, notably working multiple jobs to finance Hamilton's early foray into racing until he was signed by McLaren at the age of 11.

However, his earnings outside of Formula One rose from $8 million in 2021 to $12 million in 2022. Hamilton was the highest-paid Formula One racer. He has profitable agreements with companies such as Monster energy drinks.

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Answer:

Examples of double salts include alums and Tutton's salts. Other examples include potassium sodium tartrate, ammonium iron(II) sulfate (Mohr's salt), and bromlite.

Explanation:

To solve this problem, I'll need some additional information related to the molar mass of butane (C4H10). Please provide the molar mass of butane so that I can proceed with the calculations.

HCN, Na2SO4: Combination of compounds.

Mg3N2: Chemical compound.

CO2, H2O: Dissolution or hydration reaction.

Cu, Zn(NO3)2: Single-replacement reaction.

Na, N2: Combination of elements.

Let's analyze each chemical combination to determine the type of reaction involved:

HCN, Na2SO4:

The combination of hydrogen cyanide (HCN) and sodium sulfate (Na2SO4) does not represent a specific chemical reaction. It is simply the combination of two compounds.

Mg3N2:

Mg3N2 represents a chemical compound, magnesium nitride. It does not indicate a specific reaction.

CO2, H2O:

The combination of carbon dioxide (CO2) and water (H2O) represents a chemical reaction known as hydration or dissolution. When carbon dioxide dissolves in water, it forms carbonic acid (H2CO3), which can further dissociate into hydrogen ions (H+) and bicarbonate ions (HCO3-).

Cu, Zn(NO3)2:

The combination of copper (Cu) and zinc nitrate (Zn(NO3)2) represents a single-replacement reaction. Copper displaces zinc from the compound, resulting in the formation of copper nitrate (Cu(NO3)2) and zinc metal (Zn).

Na, N2:

The combination of sodium (Na) and nitrogen gas (N2) does not represent a specific reaction. It is simply the combination of two elements.

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Answer:Adding or removing energy from matter causes a physical change as matter moves from one state to another. For example, adding thermal energy (heat) to liquid water causes it to become steam or vapor (a gas). And removing energy from liquid water causes it to become ice (a solid)

Explanation:

Answer:

Molecular formula of the compound- C5H10O6

Molecular mass of the compound = 166.127 g

Explanation:

The molecule is a sugar with molecular formula C5H10O6. Now, we have to note the relative atomic masses of the elements in order to calculate the molecular mass of the compound to the hundredth place.

Carbon= 12.011, Hydrogen= 1.00784, Oxygen= 15.999

Hence , molecular mass = 5(12.011) + 10(1.00784) + 6(15.999)

Molecular mass = 60.055 + 10.0784 + 95.994

Molecular mass= 166.127 g

Answer:

The molecular formula = C5 H10 O5

Molecular mass = 150

Explanation:

C = 12.011

C X 5 = 60.055

H - 1.0079

H X 10 = 10.079

O = 15.999

O X 5 = 79.995

60.055 + 10.079 + 79.995 = 150.13

Answer: its nitride ion

Explanation:

Therefore,  the mass in grams of the dihydrate H2C2O4 • 2 H2O (molar mass = 126.0 g/mol) is needed in order to make 100.0 mL of a 0.356 M solution of H2C2O4 is 4.49g.

To calculate the  mass in grams of the dihydrate H2C2O4 • 2 H2O we first need to find the moles of H2C2O4.

Moles of solute = molarity * litres in solution.

             = 0.356 *0.01L=0.0356moles.

since dihydrate H2C2O4 • 2 H2O  has molar mass of 126.0g/mol it means it has a mass of 126g.

By using mole to mass conversion.

mass of H2C2O4 • 2 H2O= moles of H2C2O4 • 2 H2O * molar mass of H2C2O4 • 2 H2O

mass of H2C2O4 • 2 H2O= 0.0356moles * 126glmol

                                         =4.49g.

Therefore,  the mass in grams of the dihydrate H2C2O4 • 2 H2O (molar mass = 126.0 g/mol) is needed in order to make 100.0 mL of a 0.356 M solution of H2C2O4 is 4.49g.

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Answer:

its $

Explanation:

Answer:

Which statement describes a step in the formation of an ionic bond? An attraction occurs between two ions that have the same charge.

Explanation:

Answer: 4.2

Explanation:

\(M_{A}V_{A}=M_{B}V_{B}\\(12)V_{A}=(250)(0.20)\\V_{A}=\frac{(250)(0.20)}{12}=\boxed{4.2}\)

Answer:

3 mol H2/2 mol N2

Explanation:

Mole ratios are basically from the numbers/coefficients in front of the element

Answer:

25.4mL of KOH 0.800M must be added to obtain the desire pH

Explanation:

pKa of 1,2-pentanedioic acid is 4.34.

It is possible to find pH of a buffer by using H-H equation, thus:

pH = pka + log [A⁻] / [HA]

Where [HA] is concentration of acid and [A⁻] is concentration of conjugate acid.

Replacing:

4.40 = 4.34 + log [A⁻] / [HA]

1.148 =  [A⁻] / [HA] (1)

5.02g of 1,2-pentanedioic acid (Molar mass: 132.11g/mol) are:

5.02g ₓ (1mol / 132.11g) = 0.0380 moles of acid. That means:

[A⁻] + [HA] = 0.0380 (2)

Replacing (1) in (2):

1.148 =  0.0380 - [HA] / [HA]

1.148[HA] =  0.0380 - [HA]

2.148[HA] = 0.0380

[HA] = 0.0177 moles

Thus:

[A⁻]  = 0.0380 - 0.0177 = 0.0203 moles [A⁻]

The moles of A⁻ comes from the reaction of the weak acid with KOH, that is:

HA + KOH → A⁻ + H₂O + K⁺

Thus, you need to add 0.0203 moles of KOH to produce 0.0203 moles of A⁻. As KOH solution is 0.800M:

0.0203 moles KOH ₓ (1L / 0.800mol) = 0.0254L of KOH 0.800M =

Explanation:

Common Lead Storage Battery Used In Automobiles, The Following Two Half-reactions Occur In Acid Solution: Oxidation Pb(s)+HSO−4(aq) → PbSO4(s) Reduction PbO2(s)+HSO−4(aq) → PbSO4(s). Write A Balanced Equation For The Overall Battery Reaction.

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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Explanation:

To calculate the heat gained by nickel, we can use the formula:

q = m * c * ΔT

where q is the heat gained, m is the mass of the nickel, c is the specific heat of nickel, and ΔT is the change in temperature.

Given:

- Mass of nickel, m = 31.4 g

- Specific heat of nickel, c = 0.443 J/g · °C

- Change in temperature, ΔT = 64.2 °C - 27.2 °C = 37.0 °C

Substituting the values into the formula, we get:

q = (31.4 g) * (0.443 J/g · °C) * (37.0 °C)

Simplifying the calculation, we get:

q = 584 J

Therefore, the heat gained by nickel when 31.4 g of nickel is warmed from 27.2 °C to 64.2 °C is 584 J.

A 10g metallic block measures has a volume of 5 cm^3. The density of the metallic block in g/cm^3 is 2gm/cm^3. The density of a metallic block is calculated by p=m/v

Its density is the amount of "stuff" that can be packed into a given amount of space. A block of the tougher, lighter element gold (Au), for example, will have a higher density than a block of the heavier element lead (Pb).

The density of a substance is given by the following formula:~

                                   ρ = m/v

where the respective alphabets stands for

ρ is the density

m is the mass

V is the volume

by replacing in formula :

                                    p = 10(gm)/5cm^3

                                    p = 2gm/cm^3

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wavelength of  (λmax) for Cu(NH3)4 2+ is less than  λmax for Cu(H2O)6 2+

Gamma rays have incredibly short wavelengths that are only a small percentage of the size of atoms, but other wavelengths can stretch as far as the cosmos since the connection between wave frequency and wavelength is inverse. Although it isn't often stated explicitly, electromagnetic radiation's wavelengths are typically represented in terms of the vacuum wavelength, regardless of the medium they are traveling through.

Electromagnetic radiation's behavior is influenced by its wavelength. wavelength x frequency equals the speed of light. Energy equals Planck's constant times frequency. Wave number in cm equals 1/wavelength. A rough estimate of the wavelength size is shown along with the wavelengths of several regions of the electromagnetic spectrum.

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