A 50 ml graduated cylinder is filled with 23.0 mL of water. Water is then added to the cyl- inder dropwise until 36.0 mL of water are in the cylinder. If it took 265 drops to increase the volume in the cylinder to 36.0 mL. How many drops are in 1 ml?

Answer:

The magnesium reacts with the acid, producing visible bubbles of hydrogen gas. (Optional) If the flame of a butane fireplace lighter is held above the bursting bubbles, they will produce audible pops as the hydrogen ignites. Magnesium ribbon is a flammable solid. Hydrochloric acid is a corrosive liquid.

Explanation:

Magnesium reacts with hydrochloric acid according to the equation: Mg(s) + 2 HCl(aq) --> MgCl2(aq) + H2(g) This demonstration can be used to illustrate the characteristic reaction of metals with acid, a single replacement reaction, or to demonstrate the generation of hydrogen gas.

The reaction between the magnesium metal and hydrochloric acid can be represented as:

[tex]Mg(s) + 2HCl(aq) \longrightarrow MgCl_2(aq) +H_2(g)[/tex]

The chemical reaction between magnesium metal and dilute hydrochloric acid can be described as a redox reaction where both reduction and oxidation will take place.

The following chemical reaction Mg and HCl will take place as:

[tex]Mg(s) + 2HCl(aq) \longrightarrow MgCl_2(aq) +H_2(g)[/tex]

The oxidation state of Mg changes from 0 to +2, Mg is getting oxidized to magnesium cation, Mg²⁺ whereas the oxidation state of Hydrogen of HCl is changed from + 1 to 0 and is getting reduced.

Therefore, Magnesium acts as a reducing agent, and hydrogen acts as an oxidizing agent in this reaction. There is a formation of magnesium chloride and hydrogen gas is liberated.

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Answer:

Chemical reactivity increases down a group and decreases from left to right of a period.

Explanation:

The higher the ionization energy is, the lower the reactivity is. Since the ionization energy is highest in the top right corner of the periodic table, we can assume that the most reactive elements are in the opposite bottom left corner. This is because the electrons that react are farther away from the nucleus thus experience less attraction to the nucleus (called nuclear shielding). Therefore their electrons are more easily removed than elements that don't ecperience nuclear shielding.

Answer:

A soap or alcohol will interfere with the hydrogen bonding between water molecules making it weaker

Explanation:

A water molecule is polar as the oxygen atom is strongly electronegative and draws the electrons it shares with the hydrogen atoms in the water molecule to itself. This creates a partial negative charge on the oxygen atom and partial positive charges on the hydrogen atoms. The attraction of neighboring oxygen to hydrogen atoms in a water molecule results in hydrogen bonding.

However, a detergent molecule which has a polar head and a hydrophobic tail, when added to water significantly interferes with the hydrogen bonding between water molecules. The polar head is attracted to water molecules whereas the hydrophobic tail of each molecule are not. The detergent molecules form clusters known as micelles with the polar heads attracted to water and the hydrophobic tails directed towards the center of the micelle, away from water molecules. This weakens the hydrogen bonding between water molecules

An alcohol contains a polar -OH group in its molecules. However, the hydrogen bonding between alcohol molecules are weaker than that in water because the other end of the alcohol molecule has a C-O bond which is less polar than the O-H bond. Therefore, when an alcohol is added to water, it weakens the hydrogen bonding in water.

This weakening of the hydrogen bonding in water also has the effect of lowering the surface tension of water.

When alcohol is added to water, it disrupts the hydrogen bonding network between water molecules. Alcohol molecules compete with water molecules for hydrogen bonding sites, leading to a decrease in the number and strength of hydrogen bonds between water molecules.

When soap is added to water, the hydrophobic tails of the soap molecules are attracted to each other, forming structures called micelles.

Alcohol, such as rubbing alcohol (isopropyl alcohol), is a different type of molecule compared to soap.

Experiment with a penny, water, soap, and rubbing alcohol, the soap is likely to disrupt the hydrogen bonds more significantly than rubbing alcohol. Soap will interfere with the hydrogen bonding between water molecules through micelle formation and reduction of surface tension.

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Answer:

barium-146

Explanation:

Beta emission is said to occur when a neutron is converted to a proton, an electron and a neutrino. Beta emission leads to a decrease in the Neutron/Proton ratio.

Beta emission is common for heavier nuclei having a large number of neutrons. Barium-146 has 90 neutrons, hence it is more likely to undergo beta emission than other nuclides stated among the options.

Answer:

55000 (put a line above the second 5)

Answer:

1200

Explanation:

bc 12x20x5

Answer:

The volume of the rectaganle is 1200cm.

Explanation:

U take Length×width×height

so l×w×h = 12cm × 20 cm × 5cm

Answer:

2.90 × 10⁻³

Explanation:

Step 1: Given data

pH: 1.80

Concentration of the weak acid (Ca): 0.086 M

Step 2: Calculate the concentration of H⁺

We will use the following expression.

pH = -log [H⁺]

[H⁺] = antilog -pH = antilog -1.80

[H⁺] = 0.0158 M

Step 3: Calculate the acid dissociation constant (Ka)

We will use the following expression.

Ka = [H⁺]² / Ca

Ka = 0.0158² / 0.086

Ka = 2.90 × 10⁻³

Answer:

ΔEN CO   = 1.0

Explanation:

To calculate the electronegativity difference, we have to substract the element which has the highest EN to the other, that has a low value.

For this case EN from O - EN from C

Electronegativity is a property of the periodic table that increases diagonally, where Fr and Rb are the elements of less EN while F is the most electronegative element, with a value of 4. This is because F is an element with a high ionization energy and a negative electronic affinity.

ΔEN CO  = 3.5 - 2.5 = 1.0

Electronegativity (EN) describes the ability of an atom to compete for

electrons with other atoms to which it is attached.

Answer:

B and D could be true

Explanation:

A volume of sodium hydroxide less than expected could occurs for two reasons:

The real concentration of sodium hydroxide was higher than expected or the amount of vinegar added was less than expected:

A. The sodium hydroxide solution had been allowed to stand exposed to the air for a long time prior to the titration.  FALSE. A long expose  to the air decreases concentration of the NaOH.

B. The volumetric flask used to prepare the diluted vinegar solution was rinsed with water prior to use.  TRUE. You add a less amount of vinegar doing you require less amount of NaOH than expected.

C. The burette used to deliver the sodium hydroxide solution was rinsed with water prior to use.  FALSE. Thus, you add a less amount of NaOH than expected. To explain the matter, you add more NaOH than expected.

D. The pipette used to deliver the vinegar solution was rinsed with water prior to use. TRUE. Again, you are adding a less amount of Vinegar than expected doing the necessary NaOH during titration less than expected

Answer:

All microscopes allow visualization of samples that are too small to be viewed by the naked eye. Microscopes let scientists make observations of microscopic objects.

Explanation:

Answer:

1. pOH = 2.4

2. pOH = 10.34

3. pH = 2.14

Explanation:

1. Determination of the pOH.

Concentration of Hydroxide ion, [OH-] = 0.004 M

pOH =?

pOH = - log [OH-]

pOH = - log (0.004)

pOH = 2.4

Therefore, the pOH of the solution is 2.4

2. Determination of the pOH.

pH = 3.66

pOH =?

pH and pOH are related by the following equation:

pH + pOH = 14

With the above formula, we can obtain the pOH of the solution as follow:

pH = 3.66

pOH =?

pH + pOH = 14

3.66 + pOH = 14

Collect like terms

pOH = 14 - 3.66

pOH = 10.34

Therefore, the pOH of the solution is 10.34

3. Determination of the pH.

Molarity of HCl = 0.0072 M

Concentration of Hydrogen ion, [H+] =?

Thus, we can obtain the concentration of Hydrogen ion, [H+] as follow:

HCl(aq) —> H+(aq) + Cl-(aq)

From the balanced equation above,

1 mole of HCl produced 1 mole of H+.

Therefore, 0.0072 M HCl will also produce 0.0072 M H+.

Therefore, the concentration of Hydrogen ion, [H+] in the solution is 0.0072 M.

Finally, we shall determine the pH of the solution as follow:

Concentration of Hydrogen ion, [H+] = 0.0072 M.

pH =?

pH = - log [H+]

pH = - log (0.0072)

pH = 2.14

Therefore, the pH of the solution is 2.14

Answer:

c. decarboxylation of an a-keto acid.

Explanation:

Decarboxylation refers to the removal of the carboxyl group from a carboxylic acid and thus releasing carbon dioxide. Decarboxylases are enzymes that speed up the removal of the carboxyl group from acids. These reactants could be amino acids, alpha-keto acids, and beta-keto acids. Biotin is known to catalyze the decarboxylation of malonyl CoA to acetyl CoA during fatty acid synthesis.

Malonyl CoA is converted to acetyl CoA after decarboxylation assisted by biotin also known as Vitamin H. Alpha keto acids are involved in fatty acids synthesis and Malonyl CoA is an alpha-keto acid because the keto group is located in the first carbon near the carboxylic acid group. Keto acids have both a carboxyl group and a ketone group.

Answer:

Explanation:

Density of a substance can be found by using the formula

Making volume the subject we have

From the question

mass of gold nugget = 13 g

Density = 19.3 g/cm³

Substitute the values into the above formula and solve for the volume

We have

= 0.673575

We have the final answer as

Hope this helps you

Answer:

0.674

Explanation:

Answer:

4

Explanation:

Four significant figures

Explanation:

Before it can be used in a reactor for electricity generation, however, it must undergo a series of processes to produce a useable fuel. For most of the world's reactors, the next step in making the fuel is to convert the uranium oxide into a gas, uranium hexafluoride (UF6), which enables it to be enriched.

Answer:

2.9 g

Explanation:

There is some info missing. I think this is the original question.

Ammonium perchlorate is the solid rocket fuel used by the U.S. Space Shuttle. It reacts with itself to produce nitrogen gas, chlorine gas, oxygen gas, water, and a great deal of energy.

What mass of water is produced by the reaction of 9.6 g of ammonium perchlorate?

Step 1: Given data

Mass of ammonium perchlorate: 9.6 g

Step 2: Write the balanced equation

2 NH₄ClO₄(s) → N₂(g) + Cl₂(g) + 2 O₂(g) + 4 H₂O(l)

Step 3: Calculate the moles corresponding to 9.6 g of ammonium perchlorate

The molar mass of ammonium perchlorate is 117.49 g/mol.

[tex]9.6 g \times \frac{1mol}{117.49 g} = 0.082mol[/tex]

Step 4: Calculate the moles of water formed from 0.082 moles of ammonium perchlorate

The molar ratio of NH₄ClO₄ to H₂O is 2:4. The moles of water formed are 4/2 × 0.082 mol = 0.16 mol

Step 5: Calculate the mass corresponding to 0.16 moles of water

The molar mass of water is 18.02 g/mol.

[tex]0.16 mol \times \frac{18.02g}{mol} = 2.9 g[/tex]

Answer:

a) Platinum > Beryllium > Aluminum > Magnesium > Potassium > Cesium

b) Cesium > Potassium > Magnesium > Aluminum > Beryllium > Platinum

c) Cesium > Potassium

Explanation:

We must recall that the frequency of an electromagnetic wave is directly proportional to its energy. Hence as the work function of the metal increases, the minimum frequency required for emission of electrons occur increases accordingly.

Similarly, the maximum wavelength required for electron emission to occur varies inversely as the work function of the metal hence the answer provided.

Lastly, only caesium and potassium has work function less than the energy of the incident photon hence only these two metals experience electron emission with the kinetic energy of electrons emitted from caesium greater than that emitted from potassium.

Answer: maybe a choking hazard for the ones with wires

Explanation:

The electronic configuration of ‘N’ atom is 2, 5 and to have Octet in the valence shell it requires three more electrons.When two nitrogen atoms approach each other, each atom contributes 3 electrons for bonding.There are six electrons shared between two nitrogen atoms in the form of three pairs.Therefore, there is a triple bond between two nitrogen atoms in $N _{ 2 }$ molecules.

Answer : 1721.72 g/qt are in 18.2 g/cL

Explanation :

As we are given: 18.2 g/cL

Now we have to convert 18.2 g/cL to g/qt.

Conversions used are:

(1) 1 L = 100 cL

(2) 1 L = 1000 mL

(3) 1 qt = 946 qt

The conversion expression will be:

[tex]\frac{18.2g}{1cL}\times \frac{100cL}{1L}\times \frac{1L}{1000mL}\times \frac{946mL}{1qt}[/tex]

[tex]=1721.72\text{ g/qt}[/tex]

Therefore, 1721.72 g/qt are in 18.2 g/cL

Answer: D

Explanation:

Answer: B

Explanation: Those are the steps and I took the quiz and got it right

Answer:

Answer is in the explanation

Explanation:

In an extraction process, you want to take the higher amount of a compound. You can make this due solubility of the compound in a particular solvent.

The higher solubility of the compound in the solvent, the higher extraction of the compound from the original mixture.

Solubility of caffeine in water is about 16mg/mL in water at room temperature. But in 1,2-dichloroethane is about 100mg/mL.

Thus, the reason of the better extraction with 1,2-dichloroethane is because of  the high solubility of caffeine in this solvent.

The reason for 1,2 dichloroethane a better solvent should be explained below.

In the case of the extraction process, Here we considered the greater amount of a compound. The higher solubility of the compound should be in the solvent, the higher extraction of the compound should be from the original mixture.

Thus, it should be better due to the high solubility of caffeine in this solvent.

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Answer:

toilet seat and washing of hands ✋ very well

Answer:

216.0cm³ of ore must be processed

Explanation:

First, we need to know how many grams of gold we need to obtain $100.00

Mass of gold to obtain $100.00:

$100.00 gold * (1 troy oz / $818) = 0.122 troy oz

0.122 troy oz * (1.0lb / 14.6troy oz) = 8.37x10⁻³ lb

8.37x10⁻³ lb * (454g / 1lb) =

3.80g of gold we need to obtain $100.00

Now, the ore contain 0.22g of gold in 100g and the density of the ore is 8.0g/cm³. We can solve the cubic centimeters to obtain $100.00:

Cubic centimeters of ore:

3.80g Gold * (100g Ore / 0.22g Gold) = 1727.9g of Ore

1727.9g Ore * (1cm³ / 8.0g Ore) =

Answer:

An element contains molecules composed of same atoms while a compound contains molecules of different atoms

Please find the explanation to the question below

Explanation:

A molecule is the smallest unit of a compound or element responsible for their chemical properties. It is a chemical combination of two or more atoms, which can be of the same or different elements.

Both elements and compounds are made up of molecules as rightly said in the question. However, they form in different ways. All compounds are made of molecules but not all molecules form compounds.

- When two or more of the atoms are chemically joined together by bonds, a molecule of that ELEMENT is formed. For example, a molecule of oxygen element (02) is formed when two oxygen atoms are joined together by chemical bonds.

- On the other hand, when two or more atoms of different elements are joined together by chemical bonds, a COMPOUND is formed. Hence, a compound is said to contain molecules of different elements or molecules of different atoms. For example, water molecule (H2O) is a compound because it contains the atoms of different elements (hydrogen and oxygen) joined together.

6.)Isotopy is a phenomenon whereby atoms of an element exhibit different mass numbers but have the same atomic number. Ion is any atom or group of atoms which possesses an electric charge.

8.) Acid is a substance which produces hydrogen ions (or protons) as the only positive ion when dissolved in water.Base is a substance which will will neutralize an acid to yield a salt and water only.

7.) Valency is the combining power of an element or radical.It is actually the oxidation number assigned to the element or group of elements.

5.) Atomic shells are K,L,M,N.The electrons are negatively charged and revolve around the nucleus in spherical regions called shells or energy levels.

9.) Families of Element:Group 1 &2 make up the s-block.Group 3 to 7 and 0 form the p-block.The transition elements occurs between Groups 2 and 3 in the periodic table.They form the d-block because they contain d electrons in addition to the s and p electron.The lanthanides and actinides also occurs between group 2 and 3 in periods 6 and 7 respectively. They form the f-block because they contain f electrons in addition to the s,p and d electrons.

I hope this helps.....

Answer:

A feature called an atomic orbital describes the wave-like behavior of a bound electron.

Explanation:

Each orbital has its own set of quantum numbers such as energy, angular momentum and angular momentum projection, and there is only a distinct set of such orbitals around the nucleus.

The main difference between Proton, Neutron and Electrons can be found in their charges. Protons are positively charged and neutrons are neutral whereas electrons are negatively charged. Protons are found in the nucleus of the atom, and they reside together with neutrons. ... Protons are positively charged.

Answer:

The UTF-8 replaced ASCII because it contained more characters than ASCII that is limited to 128 characters.

Explanation:

Both ASCII UTF-8 are used for encoding characters in computer communication. UTF-8 was favored over ASCII because it provided more characters than is available in ASCII making it more acceptable world over. Also, UTF-8 can be used for many different alphabets from around the world unlike ASCII which is limited to only languages that use the Latin Alphabet.

Unicode characters are encoded into 8 bit byte sequence by UTF-8

The reason why UTF-8 replaces ASCII character-encoding standard is due to the advantages, broader scope, and utility of UTF-8 compared to ASCII, which includes;

Due to the above mentioned advantages, the UTF-8 is the preferred character encoding for a wider variety of user, making it to replace the ASCII

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