Select all that apply.

Which of the following are true about a block of ice at -10°C as you continue to apply heat.


Its temperature will not rise above -10°C until it melts.
Its temperature will rise until reaching 0°C.
Its temperature will rise continuously until it completely melts.
Its temperature will remain at 0°C until all the ice melts.

When boron-10 captures a neutron, it forms lithium-7 and an alpha particle (helium nucleus). The balanced equation for this reaction is: B-10 + n -> Li-7 + alpha particle

A helium nucleus is a particle that consists of two protons and two neutrons bound together by the strong nuclear force, and is also known as an alpha particle. It is denoted by the chemical symbol α, and has a mass of approximately 4 atomic mass units. Helium nuclei are produced naturally in the process of alpha decay, which occurs when a heavy, unstable nucleus emits an alpha particle to become more stable. Helium nuclei are also used in a variety of applications, such as in nuclear physics research, in medical radiotherapy, and in smoke detectors.

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Answer:

Oxidation state for Mg(s) is 0

Explanation:

This is redox reaction, where one element is oxidized and another is reduced.

H from water is being reduced while the Mg which is in ground state is oxidized.

When the element is reduced, the oxidation state is decreased:

2H⁺ + 2e⁻  ⇄  H₂

When the element is oxidized, the oxidation state is increased

Mg ⇄ Mg²⁺ + 2e⁻

As Mg(s) in the product side, is at ground state, the oxidation state is 0.

Any element in ground state has 0, as oxidation state.

Answer:

And since there is a frictional force acting upon the rotating blades of the fan due to the air, the speed of the fan blades ceases and ultimately comes to halt. Thus here, air friction is the external force which makes the fan blades to stop after sometime, otherwise it would have never stopped rotating :P.

Explanation:

Answer: air friction

Explanation:

Less evaporation means that less of the sun's energy is used to convert water into water vapor, and more of it is used to heat up the surface. In urban areas, there is typically less vegetation and more impervious surfaces (such as concrete and asphalt), which reduces the amount of water that can evaporate.

This means that more of the sun's energy is absorbed by the surface, leading to higher temperatures. Additionally, buildings and other structures in urban areas can trap heat and prevent it from dissipating, further contributing to the urban heat island effect.

In rural areas, vegetation and soil moisture play an important role in regulating temperature through a process called evapotranspiration. Evapotranspiration is the combined process of water evaporation from the soil and plant transpiration. It helps to cool the air by removing heat from the surface through the transfer of water from the surface to the atmosphere.

In contrast, urban areas have a significant amount of impervious surfaces like concrete, asphalt, and buildings, which reduce the amount of vegetation and soil moisture. As a result, urban areas have less evapotranspiration, which means less cooling effect from the evaporation of water. This leads to a higher surface temperature in urban areas.

Furthermore, urban areas have a higher proportion of dark-colored surfaces, such as asphalt and concrete, which absorb more solar radiation than lighter-colored surfaces like vegetation and soil. This is known as the "urban heat island effect," which further contributes to higher temperatures in urban areas.

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This problem is providing information about the loss of mass for a reaction 50 °C as a function of the time elapse. Thus, when taking a look at the given graph, we can trace a horizontal line on the y-axis at 0.95 g in order to intercept it with the curve, and hence, figure out the time at which that loss of mass takes place.

Thus, we can see that when the loss of mass hits 0.95 g, the corresponding time on the graph is about 80 seconds, and hence, the rate of reaction turns out to be:

\(r=\frac{0.95g}{80s}\\\\r=0.012\frac{g}{s}\)

Which has two significant figures as required.

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Answer:

Heat is released when they are both mixed together.

Explanation:

Answer:

The answer was be 1-chloro-1-butyne

Explanation:

In other words the answer is option letter A

You welcome have a nice day.

The name of the given alkyne, CH₃CH₂C = C – CI is 1 chloro 1 butyne.

The correct option is A.

Alkynes are unsaturated hydrocarbons, that have carbon-carbon triple bonds.

Chlorobutyne is colorless and is liquid at room temperature and pressure.

It is polar, but still slightly soluble in water.

Thus, the correct option is A, 1 chloro 1 butyne.

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A) The value of Ka for the weak acid C₆H₅NH₃⁺ is approximately 5.03 × 10⁻¹¹.

b) The value of Kb for the weak base ClO⁻ is approximately 1.86 × 10⁻⁵.

A) For the weak acid C₆H₅NH₃⁺, the equilibrium expression for Ka is given by: Ka = [C₆H₅NH₂][H₃O⁺] / [C₆H₅NH₃⁺].

[C₆H₅NH₃⁺] = 0.233 M

[C₆H₅NH₂] = 2.3 × 10⁻³ M

[H₃O⁺] = 2.3 × 10⁻³ M

Plugging these values into the Ka expression:

Ka = (2.3 × 10⁻³ M)(2.3 × 10⁻³ M) / (0.233 M)

Ka ≈ 5.03 × 10⁻¹¹

b) For the weak base ClO⁻, the equilibrium expression for Kb is given by: Kb = [OH⁻][HClO] / [ClO⁻].

[OH⁻] = 4.0 × 10⁻⁴ M

[HClO] = 2.38 × 10⁻⁵ M

[ClO⁻] = 0.273 M

Plugging these values into the Kb expression:

Kb = (4.0 × 10⁻⁴ M)(2.38 × 10⁻⁵ M) / (0.273 M)

Kb ≈ 1.86 × 10⁻⁵

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The net ionic equation for the given reaction is as follows: Ba2+ + CO32- -> BaCO3.

The given total ionic equation is as follows: Ba2+ + 2NO3- + 2Na+ + CO32- → BaCO3 + 2Na+ + 2NO3-. The first step to finding the net ionic equation is to write the balanced molecular equation. The balanced molecular equation is given below: Ba(NO3)2 + Na2CO3 → BaCO3 + 2NaNO3.

The next step is to write the total ionic equation, where all the ions that participate in the reaction are written in their ionic forms. Ba2+ + 2NO3- + 2Na+ + CO32- → BaCO3 + 2Na+ + 2NO3-The last step is to cancel out the spectator ions that appear on both sides of the equation. The spectator ions are Na+ and NO3-.The resulting net ionic equation is as follows: Ba2+ + CO32- → BaCO3.

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The empirical formula of this compound can be determined using the percent composition data. Since the atomic masses are 12 g/mol for C, 16 g/mol for O, and 190 g/mol for Os, the molar ratio of C, O, and Os are 1.32:1.75:12.50, respectively. Thus, the empirical formula of the compound is CO2Os.

Since the molar mass of the compound is 907 g/mol, the molecular formula can be determined by dividing the molar mass by the empirical formula mass.

The empirical formula mass of CO2Os is 304 g/mol. Dividing 907 g/mol by 304 g/mol yields 3, which means that the molecular formula of the compound is CO2Os3. Thus, the compound is composed of three empirical formula units, forming an Osmium-Carbon Monoxide complex with three Os atoms and two CO molecules.

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Answer:

the answer is A

Explanation:

Forces are the intermolecular interaction between the matter. Forces present in a solid are strongest. Thus, option A is correct.

The matter is any substance that occupies a volume. Matter can be a solid, gas, or liquid. The solid phase particles are tightly closed to each other making the force strong.

The particles of liquids that are not too compact are a little free and in gases, the particles are very free, which makes the bonding and the force the weakest.

Therefore, option A. the solids have the strongest intermolecular bonding.

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Answer:

8.11

Explanation:

pH = -log[H+]

pH = -log[7.8 x \(10^{-9}\)]

pH = 8.107905...

pH = 8.11

If 10 moles of P4S3 were used, the mass of P4O6 produced would be 2838.8 grams.

To determine the number of grams of P4O6 produced from 10 moles of P4S3, we need to use the balanced chemical equation and the molar masses of the compounds involved.The balanced equation for the reaction between P4S3 and oxygen to produce P4O6 is:

P4S3 + 8 O2 → P4O6 + 6 SO2

From the balanced equation, we can see that the molar ratio between P4S3 and P4O6 is 1:1. This means that for every 1 mole of P4S3 consumed, 1 mole of P4O6 is produced.The molar mass of P4S3 is 220.25 g/mol, and the molar mass of P4O6 is 283.88 g/mol.

To calculate the mass of P4O6 produced, we can use the following equation:

Mass of P4O6 = Moles of P4O6 × Molar mass of P4O6

Since the molar ratio between P4S3 and P4O6 is 1:1, the number of moles of P4O6 produced is also 10 moles.

Mass of P4O6 = 10 moles × 283.88 g/mol = 2838.8 grams

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Answer:

Question 2: Because the elements could be unstable, forming elemental compounds.

Question 1: Water is made up of Hydrogen and oxygen, which is namely called H2^o What makes it a pure substance is the little mass and molecules it's made up of.

Answer:

Look in explanation:

Explanation:

The definition of temperature is the measure of kinetic energy(which is the energy used to measure motion). Since phase changing is only changing the energy, the kinetic energy will not change. There is only energy used to separate the molecules. You can see on a phase change graph that the temperature stays constant during a phase change and will ONLY change after the change has already been done.

To make 2 moles of C6H12O6, we would need 12 moles CO2

Mole can be defined as the unit of amount of substance in the International System of Units. The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object.

According to the balanced chemical equation:

6CO2 + 6H2O → C6H12O6 + 6O2

The molar ratio between CO2 and C6H12O6 is 6:1. This means that for every 6 moles of CO2 used, 1 mole of C6H12O6 is produced.

Therefore, to make 2 moles of C6H12O6, we would need:

6 moles CO2/1 mole C6H12O6 × 2 moles C6H12O6 = 12 moles CO2

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Answer:

The given equation shows the decomposition of hydrated sodium sulfate to form anhydrous sodium sulfate:

$Na_2SO_{4 \cdot x} \rightarrow Na_2SO_4 + xH_2O$

From the given data, we know that 10.10 g of hydrated sodium sulfate decomposes to form 4.40 g of anhydrous sodium sulfate. Let's first calculate the number of moles of anhydrous sodium sulfate formed:

$Moles\ of\ Na_2SO_4\ =\ \frac{4.40\ g}{142.04\ g/mol} = 0.0310\ mol$

Since one mole of hydrated sodium sulfate produces one mole of anhydrous sodium sulfate, the number of moles of hydrated sodium sulfate present in 10.10 g can be calculated as:

$Moles\ of\ Na_2SO_{4 \cdot x}\ =\ 0.0310\ mol$

The formula mass of the hydrated sodium sulfate can be calculated by adding the molar masses of all its constituent atoms:

$Formula\ mass\ of\ Na_2SO_{4 \cdot x}\ =\ 2\times23.00\ g/mol\ +\ 32.06\ g/mol\ +\ x\times18.02\ g/mol = 142.04\ g/mol$

Solving for x, we get:

$x = \frac{142.04\ g/mol - 46.00\ g/mol - 32.06\ g/mol}{18.02\ g/mol} = 4$

Therefore, the formula of the hydrated sodium sulfate is $Na_2SO_{4 \cdot 4H_2O}$ and its formula mass is 322.20 g/mol.

The standard Gibb’s Free Energy for the reaction \(Ag_2O\) (s) + 2 \(HNO_3\) (aq) → 2 \(AgNO_3\) (s) + \(H_2O\) (l) is -508.46 kJ/mol.

To calculate the standard Gibbs free energy change, we need to use the following equation:

ΔG° = ΣnΔGf°(products) - ΣnΔGf°(reactants)

where ΔGf° is the standard Gibbs free energy of formation of the compound and n is the stoichiometric coefficient of the compound in the balanced chemical equation.

We can look up the values of ΔGf° for each compound involved in the reaction and plug them into the equation:

\(Ag_2O\) (s): ΔGf° = -31.05 kJ/mol

\(HNO_3\) (aq): ΔGf° = -207.13 kJ/mol

\(AgNO_3\) (s): ΔGf° = -124.64 kJ/mol

\(H_2O\) (l): ΔGf° = -237.13 kJ/mol

Note that the standard Gibbs free energy of the formation of elements in their standard state is zero.

Using the stoichiometric coefficients from the balanced chemical equation, we have:

ΔG° = (2 mol)(-124.64 kJ/mol) + (1 mol)(-237.13 kJ/mol) - (1 mol)(-31.05 kJ/mol) - (2 mol)(-207.13 kJ/mol)

ΔG° = -508.46 kJ/mol

Therefore, the standard Gibbs free energy change for the reaction is -508.46 kJ/mol.

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To solve this problem we are going to assume that the temperature at which the gold is found is room temperature.

We are going to use a property of materials that relates mass to volume, this is density. At this temperature, the density of gold is 19.3g/mL, the equation of density is:

We will use the following conversion factors:

1mL=1000mm^3

1atom=3.271x10^-22g

So, the atoms present in 3.00mm^2 will be:

In 3.00mm^3 of gold, there are 1.77x10^20 atoms

Answer: 1.77x10^20 atoms

Answer:

The smaller number in pounds per gallon is 3.59 × 10⁻⁴ pounds/gallon

The larger number in pounds per gallon is 1.72 × 10⁻³ pounds/gallon

Explanation:

For the smaller number in the range in pounds per gallon (pounds/gallon),

The smaller number in the range is 4.3 mg per dL

First, we will convert 4.3 mg to pounds

(NOTE: 1 g = 0.00220462 pound)

Then, for 4.3 mg in pounds

4.3 mg = 4.3 × 10⁻³ g = 0.0043 g

Now, If 1 g = 0.00220462 pound

Then, 0.0043 g =

(0.0043 × 0.00220462) pound = 9.48 × 10⁻⁶ pound

Also, we will convert dL to gallon

(NOTE: 1L = 0.264172 gallon)

Then, 1 dL = 0.0264172 gallon

Hence, 4.3 mg per dL is 9.48 × 10⁻⁶ pound / 0.0264172 gallon

= 3.59 × 10⁻⁴ pounds/gallon

Hence, the smaller number in pounds/gallon is 3.59 × 10⁻⁴ pounds/gallon

Now, for the larger number in the range in pounds per gallon (pounds/gallon),

The larger number in the range is 20.6 mg per dL

First, convert 20.6 mg to pounds

20.6 mg = 20.6 × 10⁻³ g = 0.0206 g

If 1 g = 0.00220462 pound

Then, 0.0206 g =

(0.0206 × 0.00220462) pound = 4.54 × 10⁻⁵ pound

Recall that, 1 dL = 0.0264172 gallon

Then, 20.6 mg per dL is 4.54 × 10⁻⁵ pound / 0.0264172 gallon

= 1.72 × 10⁻³ pounds/gallon

Hence, the larger number in pounds per gallon is 1.72 × 10⁻³ pounds/gallon

Answer: A

Explanation:

Table salts and table sugars are pure substances. The correct option is c.

Pure substances are those substances that are made up of only one kind of atoms. They have definite mass and chemical composition. Some examples of pure substances are salt, sugar, baking soda, etc.

All chemical elements are pure substances. Table salt is an ionic compound that is made up of two elements, sodium, and chloride.  It comes under pure substance as it do not contain any impurities.

Table sugar is a compound that is made up of three elements, carbon, hydrogen, and oxygen. It is a pure substance because it has fixed a chemical composition and no impurities are present in it.  They are crystals.

Thus, the correct option is c. pure substances.

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Answer:

Because ocean water contains salt, there is also sodium and chlorine in the oceans.

Explanation:

Answer: Easy,the answer is the letter D

Answer:

\(\left 29 \atop 14 \right Si\)

Si - 29

Explanation:

Atomic mass = # of protons + # of neutrons

# of protons = element number and type

An expression for the most probable speed of molecules of molar mass and temperature v² = 2kT/m.

Therefore, the most probable speed of molecules of molar mass and temperature t is given by vmp = (2kT/m)(1/2)

The most probable speed of molecules of molar mass and temperature t is determined by the Maxwell-Boltzmann distribution. The distribution is expressed by the following equation:

f(v) = 4π(v²) (m/2πkT)(3/2) exp(-mv²/2kT), where f(v) is the probability density function of the speed v, m is the molar mass of the gas, k is the Boltzmann constant, and T is the temperature.

To find the expression for the most probable speed, we differentiate f(v) with respect to v and set the result equal to zero:

df/dv = 8πv(m/2πkT)(3/2) exp(-mv²/2kT) - 4πv³(m/2πkT)(3/2) exp(-mv²/2kT) = 0.

Simplifying this expression, we get:v² = 2kT/m.

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Based on the information provided, if the compound has stronger hydrogen bonds than water, it suggests that the compound has a higher specific heat than water. The correct option is A.

Specific heat is a measure of how much heat energy is required to raise the temperature of a substance.

Water has a high specific heat due to its extensive hydrogen bonding, which allows it to absorb and release heat energy effectively.

If the compound being investigated has even stronger hydrogen bonds than water, it implies that it can absorb more heat energy before its temperature increases significantly.

Therefore, it can be concluded that the specific heat of this compound is higher than the specific heat of water, as it can absorb and store more heat energy per unit mass, making it more resistant to temperature changes. The correct option is A.

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Answer:

Distilation because they have different boiling points

The 3 isomers of pentane and their normal boiling points are:-

pentane, b.p approx. 36.C

iso pentane, b.p approx. 28.C

neo pentane, b.p approx. 10.C

Those differences in their boiling points make possible them to separate by Distilation.

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