When a mixture of carbon and water is FILTERED, which of these
is the RESIDUE?

Options:
The UNDISSOLVED SOLID: carbon
The LIQUID: water
The MIXTURE: carbon + water
[NONE of these]: You cannot filter carbon
+ water

Answer:

atoms and molecules

Explanation:

matter is made up of particles called atoms and molecules

Matter is made up of small molecules and attoms

Answer:

C. Glass

Explanation:

Amorphous solids have a non-crystalline structure and no order. In that case, Diamonds, Graphite, and Iron all have a crystalline structure and order. You are left with C as your answer.

Answer:

yes

Explanation:

I would get colder the more ice you put in it

Answer:

D

Explanation:

A single-replacement reaction occurs when one element replace another in a single compound.

\(single replacement = dual replacement = d - 1 replacement = e - d-e = single replacement or 1^2 x^{2} \lim_{n \to \infty} a_n x \left \{ {{d=2} \atop {e=2}} \right.\)

The Plastic Limit (PL) is 29 g.

The Plasticity Index (P) is 20.14.

To determine the Plastic Limit (PL), we need to subtract the weight of the can and dry soil from the weight of the can.

Weight of can and dry soil = 45 g

Weight of can = 16 g

PL = Weight of can and dry soil - Weight of can

PL = 45 g - 16 g

PL = 29 g

To determine the Plasticity Index (P), we subtract the Plastic Limit (PL) from the Liquid Limit (LL).

Liquid Limit (LL) = 49.14

P = LL - PL

P = 49.14 - 29

P = 20.14

The moisture content at which a fine-grained soil can no longer be remoulded without splitting is known as the Plastic Limit (PL).

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The empirical formula for the compound is Ca(OH)₂.

To determine the empirical formula of the compound, we need to find the simplest whole-number ratio of the elements present. We can do this by calculating the number of moles of each element and then finding the ratio between them.

Mass of calcium (Ca) = 13.5 grams

Mass of oxygen (O) = 10.8 grams

Mass of hydrogen (H) = 0.675 grams

First, we need to convert the masses of each element to moles using their respective atomic masses.

Atomic mass of Ca = 40.08 g/mol

Atomic mass of O = 16.00 g/mol

Atomic mass of H = 1.01 g/mol

Number of moles of Ca = 13.5 g / 40.08 g/mol = 0.3367 mol

Number of moles of O = 10.8 g / 16.00 g/mol = 0.675 mol

Number of moles of H = 0.675 g / 1.01 g/mol = 0.6693 mol

Next, we need to find the simplest whole-number ratio by dividing the number of moles of each element by the smallest number of moles obtained.

Dividing by 0.3367 (smallest value):

Number of moles of Ca = 0.3367 mol / 0.3367 mol = 1

Number of moles of O = 0.675 mol / 0.3367 mol = 2.005

Number of moles of H = 0.6693 mol / 0.3367 mol = 1.988

Rounding these values to the nearest whole number, we have:

Number of moles of Ca = 1

Number of moles of O = 2

Number of moles of H = 2

Thus, the empirical formula of the compound is Ca(OH)₂.

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Answer:

multiply

Explanation:

multiplacation

Answer:

The atomic number is the number of protons in the nucleus and also the number of orbiting electrons. The mass number is the number of protons and neutrons in the nucleus.

The mass number minus the atomic number is the number of neutrons in the nucleus.

An isotope will have a different atomic mass.

NH3 is polar because it has a trigonal pyramidal molecular geometry and the nitrogen atom has a higher electronegativity than the hydrogen atoms, giving it a partial negative charge and the hydrogen atoms a partial positive charge.

This creates a dipole moment, making NH3 a polar molecule.

On the other hand, PH3 is nonpolar because it has a tetrahedral molecular geometry and the phosphorus and hydrogen atoms all have the same electronegativity, so there is no dipole moment and no net separation of charge. Thus, PH3 is a nonpolar molecule.

The polarity of a molecule depends on its molecular geometry and the electronegativity of its atoms. The polar NH3 has a trigonal pyramidal shape with a more electronegative nitrogen atom, while the nonpolar PH3 has a tetrahedral shape with atoms of the same electronegativity.

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1) Beryllium. This element is in the second group and the second period. The atomic number is 4 which is the number of protons.

The mass number is the sum of neutrons and protons.

Assuming the element has no charge the number of electrons is equal to the number of protons.

Protons: 4.

Neutrons: the mass number - the atomic number = 9 - 4 = 5.

Electrons: 4.

ΔS is positive for the reaction A. 2H2 (g) + O2 (g) → 2H2O (g).

The entropy change (ΔS) is related to the degree of disorder or randomness of a system. Generally, the higher the degree of disorder, the higher the entropy change. Based on this, we can predict the sign of ΔS for each reaction:

A. 2H2(g) + O2(g) → 2H2O(g): This reaction involves the formation of two molecules from three, which implies an increase in the degree of disorder, and therefore, ΔS is positive.B. CO2(g) → CO2(s): This reaction involves the formation of a solid from a gas, which implies a decrease in the degree of disorder, and therefore, ΔS is negative.

C. 2NO2(g) → N2O4(g): This reaction involves the formation of a larger molecule from two smaller ones, which implies a decrease in the degree of disorder, and therefore, ΔS is negative.

D. BaF2(s) → Ba2+(aq) + 2F-(aq): This reaction involves the dissolution of a solid into ions in solution, which implies an increase in the degree of disorder, and therefore, ΔS is positive.

E. 2Hg(l) + O2(g) → 2HgO(s): This reaction involves the formation of a solid from a liquid and a gas, which implies a decrease in the degree of disorder, and therefore, ΔS is negative.

Therefore, the answer is A. 2H2(g) + O2(g) → 2H2O(g).

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ΔS is positive for the reaction A. 2H2 (g) + O2 (g) → 2H2O (g), as the number of gas molecules decreases from 3 to 2, resulting in an increase in entropy. In option B, the phase change from gas to solid results in a decrease in entropy.

Option C is a reversible reaction and does not change the number of gas molecules, so there is no change in entropy. Option D is a dissolution reaction, which can either increase or decrease entropy depending on the specific conditions. Option E involves a phase change from liquid to solid, resulting in a decrease in entropy.
For which reaction ΔS is positive. ΔS refers to the change in entropy, which is a measure of the disorder in a system. A positive ΔS means an increase in disorder.

Reaction D, BaF2 (s) → Ba2+ (aq) + 2F- (aq), has a positive ΔS. In this reaction, a solid compound dissociates into its ions, which are dispersed in the aqueous solution. This increases the disorder of the system.

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Answer:

Anions or negatively-charged ions

Explanation:

The final temperature of the gas is approximately 40.96 Kelvin.

To determine the final temperature of the gas, we can use the ideal gas law, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature in Kelvin.

First, let's convert the given temperatures to Kelvin. We have:

Initial temperature: -125 degrees Celsius = 148 K (approximate)

Final temperature: Unknown

The initial conditions of the gas are as follows:

Initial pressure (P1) = 1.25 atm

Initial volume (V1) = 1250 mL = 1.25 L (since 1 L = 1000 mL)

Initial temperature (T1) = 148 K

The final conditions of the gas are as follows:

Final pressure (P2) = 50.0 atm

Final volume (V2) = 325 mL = 0.325 L

Final temperature (T2) = Unknown

Using the ideal gas law, we can set up the following equation:

(P1 * V1) / T1 = (P2 * V2) / T2

Substituting the known values:

(1.25 atm * 1.25 L) / 148 K = (50.0 atm * 0.325 L) / T2

Simplifying the equation:

T2 = (50.0 atm * 0.325 L * 148 K) / (1.25 atm * 1.25 L)

T2 = 40.96 K

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200 mL of 2.00 M HCl should be added to 100 mL of 2.00 M KOH to produce a solution with a pH of 7.

To determine the amount of 2.00 M HCl needed to produce a solution with a pH of 7 when mixed with 100 mL of 2.00 M KOH.  we need to consider the stoichiometry of the acid-base neutralization reactions

The balanced equation for the reaction between HCl and KOH is:

HCl + KOH → H2O + KCl

In this neutralization reaction, 1 mole of HCl reacts with 1 mole of KOH to produce 1 mole of water and 1 mole of KCl.

Since we want the resulting solution to have a pH of 7, it should be neutral. Given that the initial volume of KOH is 100 mL and its concentration is 2.00 M, we can calculate the moles of KOH:

Moles of KOH = Volume (in liters) × Concentration

Moles of KOH = 0.100 L × 2.00 mol/L

To achieve neutrality, we need an equal number of moles of HCl. Therefore, the amount of HCl needed is also 0.100 L × 2.00 mol/L.

Converting the volume to milliliters:

Volume of HCl needed = 0.100 L × 2.00 mol/L = 200 mL

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Answer:

Mass = 3 g

Explanation:

Given data:

Mass of magnesium = 2.4 g

Mass of oxygen = 2.4 g

Mass of magnesium oxide formed = ?

Solution:

Chemical equation;

2Mg + O₂    →     2MgO

Number of moles of oxygen:

Number of moles = mass / molar mass

Number of moles = 2.4 g/ 32 g/mol

Number of moles = 0.075 mol

Number of moles of magnesium:

Number of moles = mass / molar mass

Number of moles = 2.4 g/ 24 g/mol

Number of moles = 0.1 mol

now we will compare the moles of magnesium oxide with both reactant.

               Mg         :        MgO

                 2          :          2

               0.075    :        0.075

               O₂         :         MgO

                1          :           2

             0.1         :      2/1×0.1 = 0.2

Mass of magnesium oxide:

Mass = number of moles × molar mass

Mass = 0.075 mol × 40 g/mol

Mass = 3 g

Answer:

Atoms are neutral. They contain the same number of protons and electrons. An ion is an electrically charged particle produced by either removing electrons from a neutral atom to give a positive ion or adding electrons to a neutral atom to give a negative ion.

Explanation:

Hope this helped

The water molecules must have gained more thermal energy while Anh was away from the house.

An increase in the temperature of a body means that the body has gained more energy in the form of heat, also known as thermal energy.

The thermal energy represents the characteristic of a body responsible for its temperature.

An increase in the temperature of the water molecules increases their kinetic energy and, thus, makes the water molecules move around faster than before.

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Answer: A. Chemical energy transforms into mechanical energy.

Proof of validity is shown below.

Answer: lightbulb, lamp, nightlight

Explanation:

A mole of M&Ms will occupy approximately 3.82992x10¹⁷ cubic meters of volume.

The volume of one M&M is given as 6.36x10⁻⁷ m³. To find the volume occupied by a mole of M&Ms, we need to know the Avogadro's number, which is approximately 6.022x10²³ mol⁻¹.

The number of M&Ms in a mole can be calculated using Avogadro's number. Therefore, one mole of M&Ms will contain 6.022x10²³ M&Ms.

To find the total volume occupied by a mole of M&Ms, we can multiply the volume of one M&M by the number of M&Ms in a mole.

(6.36x10⁻⁷ m³) * (6.022x10²³ M&Ms) = 3.82992x10¹⁷ m³

Therefore, a mole of M&Ms will occupy approximately 3.82992x10¹⁷ cubic meters of volume.

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The ranking of the compounds from lowest to highest boiling point is as follows: methane, dimethyl ether, methanol, calcium carbonate.

The boiling point of a compound depends on the intermolecular forces present between its molecules. In the case of methane, it is a nonpolar molecule, and the only intermolecular force it experiences is London dispersion forces. The boiling point of methane is -161.5°C, making it the lowest boiling point compound in the list.

Methane (CH4): Methane is a non-polar molecule with weak London dispersion forces. It has the lowest boiling point due to these weak intermolecular forces. Dimethyl ether (CH3OCH3): Dimethyl ether is a polar molecule with stronger dipole-dipole interactions than methane. Therefore, it has a higher boiling point than methane. Methanol (CH4O): Methanol is also a polar molecule, but it has a hydroxyl group (-OH) which forms hydrogen bonds. These hydrogen bonds are stronger than the dipole-dipole interactions in dimethyl ether, leading to a higher boiling point for methanol.
Calcium carbonate (CaCO3): Calcium carbonate is an ionic compound with strong ionic bonds between the calcium and carbonate ions. Due to these strong electrostatic attractions, calcium carbonate has the highest boiling point among the compounds listed.
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The enthalpy of the reaction is 14 J/mol.

The enthalpy of a reaction (ΔH) is the amount of energy transferred between a system and its surroundings during a chemical reaction at constant pressure, measured in joules per mole (J/mol). This value is important because it can tell us whether a reaction is exothermic or endothermic, as well as give us information about the strength of chemical bonds within the reactants and products.To calculate the enthalpy of a reaction, we need to know the amount of energy released or absorbed (Q) and the number of moles of the compound involved in the reaction (n). We can use the equation:
ΔH = Q/n
Given that 6 moles of a compound produce 84 J of energy, we can calculate the enthalpy of the reaction as follows:
ΔH = Q/n
ΔH = 84 J / 6 mol
ΔH = 14 J/mol
This means that for every mole of the compound involved in the reaction, 14 J of energy is transferred between the system and the surroundings. Since the value is positive, we can conclude that the reaction is endothermic, meaning that it requires an input of energy to occur.It is worth noting that the enthalpy of a reaction can depend on a number of factors, such as temperature, pressure, and the specific conditions under which the reaction occurs. As such, it is important to take these factors into account when calculating or predicting enthalpy values.

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Answer:

It means beside or alongside.

Answer:

The word Paralympics means “parallel with the Olympics”, with the para prefix coming from the Greek word for alongside. The name was chosen to embody the spirit of the two movements existing side-by-side.

Explanation:

Answer: The transition metals have the following physical properties in common: they are good conductors of heat and electricity. they can be hammered or bent into shape easily. they have high melting points (but mercury is a liquid at room temperature)

Explanation:

The pH of the solution after mixing2 tablets of Aspirin into 300mL of water is found to be 2.5.

This type of acid/base reaction can be represented by the following straightforward equation, where HA = ASA.

A- + H3O+ from HA + H2O

Now that we know the starting HA concentration, we can calculate it. We have 5 tablets and each tablet contains 325 milligrammes of ASA, so:

5 tablets at 325 mg ASA each equals 1625 mg ASA.

By calculating the number of moles of ASA present and dividing it by the entire volume of the solution, which is 237 mL, we can turn this into the starting concentration.

9.02 moles of ASA at 1625 mg/180.157 g/mol.

9.02 moles divided by 300 mL equals 0.0381 mol/L or 0.0381 moles/mL.

With the initial concentration, we can now keep track of concentration variations and calculate the equilibrium concentrations.

The Ka value, which represents ASA's acid dissociation constant, was provided to us. The following is the formula we use to calculate this value:

Ka is equal to [A-][H3O+]/[HA] = 3.3 x 10-4.

3.3 x 10⁻⁴ is equal to Ka = [x][x]/[0.0381-x].

Since a number of 10⁻⁴ is so little, we may overlook the initial concentration change for the time being. Thus, our new, simpler equation is:

x = 0.0035 = [A-] = [H3O+] and x = 0.0038 = 3.3 x 10⁻⁴ and 1.3 x 10⁻⁵ respectively.

The concentration of hydronium ions, which is necessary to determine a solution's pH, has now been solved for. We calculate pH using the equation pH = -log[H3O+]:

pH = -log[0.0035]

pH = 2.5

So, the pH value is 2.5.

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An increase in government spending primarily shifts aggregate demand to the right.

Government spending refers to the amount of money that a government allocates for various purposes such as infrastructure development, social welfare programs, defense, and public services. When there is an increase in government spending, it has a direct impact on aggregate demand in an economy.

Aggregate demand represents the total amount of goods and services that households, businesses, and the government are willing and able to purchase at a given price level. Government spending is a component of aggregate demand, and an increase in government spending means that the government is injecting more money into the economy to purchase goods and services.

This increase in government spending has a multiplier effect. It stimulates economic activity by increasing demand for goods and services, which in turn leads to an increase in production and employment. As a result, aggregate demand shifts to the right, indicating higher levels of overall spending in the economy.

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Answer: #1 deforestation

Explanation:

The element capable of oxidizing \(\rm Fe^{2+\) ions to Fe^3+ ions is chlorine (Cl2) and bromine (Br2). Therefore option D is correct.

Both chlorine and bromine are strong oxidizing agents, meaning they can gain electrons from other substances during a chemical reaction.

In the case of \(\rm Fe^{2+\) ions, they can accept electrons from \(\rm Fe^{2+\) to form \(\rm Fe^{3+\) ions. Iodine (I2) is not capable of oxidizing \(\rm Fe^{2+\) ions to \(\rm Fe^{3+\) ions as effectively as chlorine and bromine.

Therefore, the correct answer is (d) \(\rm Cl_2\) and \(\rm Br_2\). Chlorine and bromine are more powerful oxidizers compared to iodine.

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• The balanced equation for the reaction is given by:

• From the above reaction we can see that:

1 mole of ethanol (CH3Ch2OH) produces 1 mol of acetic acid(CH3COOH)

so . x mole of ethanol will produce 0.9mol of acetic acid ....(cross multiply)

xmol ethanol * 1mol acetic = 1mol ethamol* 0.9molacetic

∴ xmol ethanol = 1*0.9 /1

= 0.90 mol

• This means that, 0.90 mol of ethanol, is needed to produce 0.9mol acetic acid,.