What is the order of decreasing reactivity of these 4 metals?

In water, sodium bicarbonate dissolves to form sodium and bicarbonate which makes the solution alkaline, which means it can neutralize acid.

An acid is described as a molecule or ion capable of either donating a proton, known as a Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid.

sodium bicarbonate is less soluble in water because the density of the water is more than the density of the sodium bicarbonate.

Acids are known to produce hydrogen ions and bases accept hydrogen ions.

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Answer:

Oxygen Doesn't change

However, Li is oxidized (0 to +1), Na is reduced (+1 to 0)

Explanation:

On reactant side, Oxygen has -2 oxidation charge because we know common oxidation states such as oxygen -2, hydrogen +1 etc.

So NaOH, O is -2, H is +1, so Na has to be +1 to equal total charge of compound

In product side, LiOH, again O has to be -2, H is +1, so Li +1 as well..

We see that oxygen oxidation state doesn't change. However, for Li it becomes oxidized going from 0 to +1 whereas, Na is reduced going from +1 to 0.

The correct option is $26785.To calculate the total cost per equivalent unit using the weighted average method, we need to consider the costs incurred in both the beginning work in process and the units added during the period.

First, let's calculate the equivalent units of production for both conversion and materials:

Conversion costs:

Beginning work in process: 400 units × 20% complete = 80 equivalent units

Units added during the period: 2,000 units × 40% complete = 800 equivalent units

Total equivalent units for conversion = 80 + 800 = 880 equivalent units

Material costs:

Beginning work in process: 400 units × 30% complete = 120 equivalent units

Units added during the period: 2,000 units × 50% complete = 1,000 equivalent units

Total equivalent units for materials = 120 + 1,000 = 1,120 equivalent units

Next, let's calculate the total costs incurred:

Conversion costs:

Beginning work in process cost: $14,880

Costs added during the period: $409,200

Total conversion costs = $14,880 + $409,200 = $424,080

Material costs:

Beginning work in process cost: $9,900

Costs added during the period: $180,080

Total material costs = $9,900 + $180,080 = $189,980

Now, we can calculate the total cost per equivalent unit:

Total cost per equivalent unit = (Total conversion costs + Total material costs) / (Total equivalent units for conversion + Total equivalent units for materials)

Total cost per equivalent unit = ($424,080 + $189,980) / (880 + 1,120)

Total cost per equivalent unit ≈ $267.85

Therefore, the correct option is $26785.

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Some of the most toxic organic compounds, widely used in plastics, pesticides, and solvents, are the dioxins.

The toxic organic compounds widely used in solvents are volatile organic compounds (VOCs) such as benzene, toluene, xylene, and chlorinated solvents like trichloroethylene (TCE) and perchloroethylene (PCE). These solvents can pose a risk to human health and the environment due to their potential for leaching into soil and groundwater, as well as their ability to contribute to air pollution.

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One way to measure the volume of an irregular object (a rock in your case) is to completely submerge it in water and measure the change in height of the water level. This change in water level (let's say from 50ml to 65ml) indicates that the volume of the stone is 15ml.

The volume of the stone depends on the size of the stone. Since rocks are irregularly shaped bodies, their volume is easily determined by the displacement of water. When an object is placed in water, the amount of water displaced by the object is equal to the volume of the object. Density is an important property of rocks as it helps identify the type of rock and its geological structure.

To calculate the density of a rock, we need to divide the rock's mass by its volume. The latter can be determined by placing the rock in a graduated cylinder filled with water.

Add 30ml of water to the graduated cylinder. 30 ml is the starting water volume. Carefully put the stone into the water. You will see the water level in the graduated cylinder rise. Suppose that the water level rises to 50 ml when a stone is added. 50 ml is the final volume of water.

To find the volume of the stone, subtract the initial water volume from the final water volume: 50ml - 30ml = 20ml. So the volume of the rock will be 20 ml or 20 cm³.

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Answer:

10

Explanation:

thats the max

It is exothermic because heat needs to be released by the reactants to form the products.

Water molecule is made up of two atoms of hydrogen and one atom of oxygen. That is H2O.

An exothermic reaction is the reaction in which energy, in the form of heat, is released into the environment. Some examples of exothermic reaction are:

Splitting of water molecule involves a process called thermal dissociation reaction which uses high temperature to split water molecules into its two components such as hydrogen and oxygen.

Here, the reactants absorbs the heat which is needed to form the products.

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Answer:

reflection is correct answer by my views

The experimental percentage yield is the ratio of the actual yield of the product of a reaction to its theoretical yield multiplied by 100.

Percentage yield of a reaction is used to study the efficiency of a chemical reaction. It is the ratio of the actual yield to the theoretical yield multiplied by 100.

The actual yield of a reaction is the experimentally obtained value and it will be less than theoretical yield which is derived from the balanced chemical equation of the reaction.

For example if 5 g be the actual yield of the product in a reaction, but the theoretical or expected yield derived from the equation be 7 g.

then the percentage yield  = 5 /7 × 100 = 71.4 %.

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The statement describe the transfer of heat is : the ice cubes gains the heat energy and the water looses the heat energy.

The law of mass of conservation mass states that mass neither be created or nor be destroyed. The law of mass of conservation energy states that the heat energy in the isolated system should de constant. if the one thing is loose the energy then the other in will gains the energy in an isolated system. according to the conditions the ice cube is at lower energy .

Thus the ice cube will gains the the heat energy that the water looses the heat energy.

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The equilibrium vapor pressure with respect to water (eow) is 259.9 Pa. assume that saturation vapor pressure is same as equilibrium vapor pressure.

Therefore, the RH at the frost point is  

RH = (eow / saturation vapor pressure) × 100

= (259.9 Pa / 259.9 Pa) × 100

= 100%

b) At T = -11 °C, we need to compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi) to determine if ice particles will form. From the given table, at T = -11 °C, the equilibrium vapor pressure with respect to water (eow) is 237.7 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 165.3 Pa.

The air is supersaturated with respect to ice, and the presence of Kaolinite particles can provide surfaces for water droplets to condense onto, leading to the formation of ice particles.

c) At T = -12 °C, we compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi). From the given table, at T = -12 °C, the equilibrium vapor pressure with respect to water (eow) is 217.3 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 181.2 Pa.

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The minimum mass of  \(CaSO_{4}\)(s) needed to achieve equilibrium in a 1.7 L solution is approximately 4.08 grams.

Step 1: Find the solubility of  \(CaSO_{4}\) in water at the given temperature.

The solubility of  \(CaSO_{4}\) in water at room temperature is approximately 2.4 grams per liter (g/L).

Step 2: Calculate the amount of  \(CaSO_{4}\) that will dissolve in 1.7 L of water.

Use the solubility value from Step 1:
Amount of  \(CaSO_{4}\) = Solubility × Volume
Amount of  \(CaSO_{4}\) = 2.4 g/L × 1.7 L
Amount of  \(CaSO_{4}\)4 ≈ 4.08 grams

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The Kinetic energy of the 5 kg bowling ball rolling 3 m/s towards the bowling pins is 22.5 Joules.

Mass of the bowling ball (m) = 5 kg

Velocity of the bowling ball (v) = 3 m/s

The formula for calculating kinetic energy is:

KE = (1/2) × m × v²

Substituting the given values:

KE = (1/2) ×5 kg ×(3 m/s)²

KE = (1/2)  5 kg × 9 m^2/s²

KE = 22.5 Joules

Therefore, the kinetic energy of the 5 kg bowling ball rolling 3 m/s towards the bowling pins is 22.5 Joules.

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The steps to make chocolate so that it does not melt on my hands are: heat the chocolate up to 120 degree fahrenheit and then after removing the bowl cool down it below 80 degree fahrenheit.

The main reasons to temper chocolate are:

1. Tempered chocolate is firm and solid in nature at room temperature. This is critical when making the chocolate confections or decorations. Chocolate which is out of temper requires refrigeration to maintain its shape.

2. The appearance of tempered chocolate is much better than that of its un-tempered counterpart. Tempered chocolate is smooth in nature , shiny and evenly colored.

3. Chocolate that is not been tempered has a distinctly dull appearance and may develop fat bloom -- grayish-white spots on the surface of the chocolate where unstable beta crystals have gathered.

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Answer:

The formula for selenic acid is H2SeO4.

Explanation:

Selenic acid is an oxoacid of selenium, which means that it contains selenium and oxygen atoms bonded together in a compound that also contains hydrogen atoms. The selenate ion, which has the formula SeO42-, is an ion that contains selenium and oxygen atoms bonded together. Based on these facts, we can predict that the formula for selenic acid will contain selenium, oxygen, and hydrogen atoms.

To determine the specific ratio of atoms in the formula for selenic acid, we can look at the valences of the elements involved. The valence of an element is the number of bonds it can form with other atoms. Selenium has a valence of 6, oxygen has a valence of 2, and hydrogen has a valence of 1.

Since selenium has a valence of 6, it can bond with 6 oxygen atoms. This means that selenic acid will contain at least one selenium atom bonded to 6 oxygen atoms. In addition, selenic acid will contain hydrogen atoms, which can bond with oxygen atoms. Based on these considerations, we can predict that the formula for selenic acid will be H2SeO4, which contains one selenium atom bonded to 6 oxygen atoms and 2 hydrogen atoms.

Answer:

0.0125mol/dm³

Explanation:

Given parameters:

Mass of carbon dioxide  = 0.22g

Volume of water  = 400cm³

Unknown:

Concentration in mol/dm³ =  ?

Solution:

Concentration is the amount of solute dissolved in a solvent.

The formula is expressed as;

    Concentration  = \(\frac{number of moles}{volume}\)  

Number of moles  = \(\frac{mass}{molar mass}\)

       Molar mass of CO₂   = 12 + 3(16) = 44g/mol

Number of moles  = \(\frac{0.22}{44}\)   = 0.0005mol

Now,

             1000cm³  = 1dm³

             400cm³ = \(\frac{400}{1000}\)  = 0.4dm³

Insert the parameters and solve;

     Concentration  = \(\frac{0.005}{0.4}\)  = 0.0125mol/dm³

Answer:

c

Explanation:

yes

Answer:

22:

Formular:

\(atomic \: mass = \frac{ \sum(isotopic \: mass \times \%abundance)}{100} \\ \)

substitute:

\(atomic \: mass = \frac{(23.985 \times 78.70) + (24.986 \times 10.13) + (25.983 \times 11.17)}{100} \\ \\ = \frac{(1887.620) + (253.108) + (290.230)}{100} \\ \\ = \frac{2430.958}{100} \\ \\ { \boxed{ \boxed{average \: atomic \: mass = 24.3 \: amu}}}\)

23:

Same element is represented by same number of protons.

Answer:

6 protons. 6 protons

7 neutrons. 8 neutrons

6 electrons. 6 electrons

Note: Atoms with same proton number but different mass number are called isotopes

Answer:

The main places you would find glaciers on in today's world are places like Alaska, Antarctica, and Greenland. Places that are cold either year-round or most of the year and are in an ocean area are typically where glaciers form.

Explanation:

These places typically are cold year-round and are the perfect area for glaciers to form, but not everywhere forms glaciers as they need certain weather conditions to form.

Answer:

silicon

Explanation:

Silicon. Silicon is often found in electronic devices, as well as the sand.

hope this helps UwU

The correct option from the given statements concerning mixtures is (d) more than one correct response.

The statement (a) "The composition of a homogeneous mixture cannot vary" is incorrect as the composition of a homogeneous mixture can vary. For example, a mixture of salt and water is homogeneous and its composition can vary depending on the amount of salt and water mixed in it.

The statement (b) "A homogeneous mixture can have components present in two physical states" is correct. Homogeneous mixtures are mixtures that are uniform throughout their composition, meaning that there is no visible difference between the components of the mixture. For example, a mixture of ethanol and water is homogeneous and its components are present in two physical states (liquid and liquid).

The statement (c) "A heterogeneous mixture containing only one phase is an impossibility" is incorrect. A heterogeneous mixture is a mixture where the components are not evenly distributed and the mixture has different visible regions or phases. However, it is possible for a heterogeneous mixture to contain only one phase. For example, a mixture of oil and water is heterogeneous but can have only one phase.

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Prevention of an epidemic is different from the prevention of a pandemic because the first situation does not involve the spread of the pathogenic agent worldwide.

The major difference between a pandemic situation and an epidemic situation is based on the fact that an epidemic is restricted to a certain area while a pandemic encompasses worldwide.

Therefore, with this data, we can see that the major difference between a pandemic situation and an epidemic situation is the length of extension of the invective agent.

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Answer:

C. is the correct answer

Explanation:

I took the test

Answer:

N have 8 13 neutrons.

Explanation:

Nitrogen-15      Nitrogen-20

     8                             13

Answer:

i fond nothing sooory

pic so PC

Answer:

The arches in your hands are supported by a "keystone structure"

Explanation:

I dunno if this is right I'm kinda slow...

Answer:

The nonpolar substance has a lower boiling point than the polar substance

Explanation:

What causes polarity is how the electrons of the molecules in each substance are being shared. To have a polar substance/molecule it means that the electrons are not equally shared and when there is non-polar molecule we have that the electrons are shared evenly.

For instance, let's say we have a chemical Compound AB. If AB is polar it means that the electrons here are not evenly distributed, thus we will have one of the molecules to be positive and the other to be negative, say A^- and B^- = A^-B^-. Hence, they have polar bonds.

The bonds in polar substance are stronger than the one in non polar substance thus we have lower boiling point in non-polar substance(the bonds are held together by weak forces) and a high boiling point in a polar substance.

Answer:

B.) The nonpolar substance has a lower boiling point than the polar substance

Explanation:

edge 2021

Answer: sandbars

Explanation: