Of the following, which atom has the smallest atomic radius?
a. sr
b. po
c. te
d. ba

Lead would react with the copper nitrate  but not with zinc nitrate.

Reactivity in chemistry refers to the rate at which a chemical undergoes a chemical reaction over time. The relative tendency of an element to gain or lose electrons during a chemical reaction. For pure compounds, reactivity is controlled by the physical properties of the sample. Atoms get larger as they go down in the group. The larger the atom, the farther away the last electron is. Therefore, the attractive force between the nucleus and the last electron is weaker. This allows the atom to donate electrons more easily, increasing its reactivity.

Alkali metals (far from transition metals and noble gases) are the most reactive group of elements. Cesium is the second most reactive element in this group, since he has six electron shells, which makes it the most reactive element.

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Answer: A. The wall push back on the ball with more force, which causes the return speed of the to increase.

Explanation: For every for exerted on an object, there is an equal force exerted in the opposite direction. When the ball hits the wall with more force, the wall pushes back on the ball with more force. This causes the return speed of the ball to increase. The force that the wall applies to the ball launches the ball in the opposite direction. The greater the force on the ball, the greater it’s speed becomes .

Answer: The wall pushes back on the ball with more force, which causes the return speed of the ball to increase.

Explanation: Correct on Study Island

Answer:

CaCO3: 1 calcium 1 carbon 3 oxygen

CaO: 1 calcium 1 oxygen

CO2: 1 carbon 2 oxygen

To see the number of atoms of any element in a particular molecule or compound, we need to multiply the stoichiometry that is written in front of the molecule to the number that is written on the foot of that element.  The number of atoms of calcium, carbon and oxygen are 1, 1, 3.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

The balanced reaction is

\(CaCO_{3}\rightarrow CaO + CO_{2}\)

There are three types of element present in this reaction: calcium, oxygen and carbon

Number of atoms of calcium on reactant and product side is 1

Number of atoms of carbon on reactant and product side is 1

Number of atoms of oxygen on reactant and product side is 3

Therefore, the number of atoms of calcium, carbon and oxygen are 1, 1, 3.

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Answer:

0.313 M NaOH

Explanation:

Got it right on the test.

Taking into account the definition of molarity, the molarity of the solution is 0.313 M.

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

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

Molarity is expressed in units \(\frac{moles}{liter}\).

In this case, you know:

Replacing in the definition of molarity:

\(molarity=\frac{0.75 moles}{2.40 L}\)

Solving:

molarity= 0.313 M

Finally, the molarity of the solution is 0.313 M.

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Answer:

4.70 grams of NH4Cl is needed to prepare 350 mL of a 0.25 M ammonium chloride solution.

We need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

To determine the mass of NH4Cl needed to prepare the solution, we us use the formula:

m=M x V x MM ... (i)

where,

m= mass in grams

M=molarity of solution

MM= molar mass of compound

V= volume in litres

The number of moles of NH4Cl needed can be calculated using:

  Moles = Molarity x Volume ...(ii)

  Moles = 0.25 mol/L x 0.350 L

  Moles = 0.0875 mol

Hence we can replace M x V with number of moles in equation i.

The molar mass of NH4Cl is :

  Molar mass of NH4Cl = (1 x 14.01 g/mol) + (4 x 1.01 g/mol) + (1 x 35.45 g/mol)

  Molar mass of NH4Cl = 53.49 g/mol

We have all the variables

Putting them in equation i.

Hence,

  Mass (g) = Moles x Molar mass

  Mass (g) = 0.0875 mol x 53.49 g/mol

  Mass (g) = 4.68 g

Therefore, you would need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

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Approximately 107.2 grams of oxygen are required to react with 250 grams of iron.

To determine the amount of oxygen required to react with 250 grams of iron, we need to consider the balanced chemical equation for the reaction between iron and oxygen. The balanced equation is:

4 Fe + 3 O2 -> 2 Fe2O3

From the balanced equation, we can see that 4 moles of iron react with 3 moles of oxygen to produce 2 moles of iron(III) oxide (Fe2O3).

To calculate the amount of oxygen needed, we can follow these steps:

Calculate the molar mass of iron (Fe):

Molar mass of Fe = 55.845 g/mol

Calculate the molar mass of oxygen (O2):

Molar mass of O2 = 2 * 16.00 g/mol = 32.00 g/mol

Convert the mass of iron to moles:

Moles of Fe = Mass of Fe / Molar mass of Fe

Moles of Fe = 250 g / 55.845 g/mol

Use the mole ratio from the balanced equation to determine the moles of oxygen:

Moles of O2 = (Moles of Fe * 3) / 4

Convert the moles of oxygen to grams:

Mass of O2 = Moles of O2 * Molar mass of O2

Now let's calculate the values:

Molar mass of Fe = 55.845 g/mol

Molar mass of O2 = 32.00 g/mol

Moles of Fe = 250 g / 55.845 g/mol ≈ 4.47 mol

Moles of O2 = (4.47 mol * 3) / 4 ≈ 3.35 mol

Mass of O2 = 3.35 mol * 32.00 g/mol ≈ 107.2 g

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In a liquid sample of pure hexane, van-der wall forces( London dispersion force) attract hexane molecules to one another in the liquid sample of pure hexane.  

Intermolecular forces tend to hold the two atoms or molecules to each other. Though they hold the entity in a weak manner as compared to intermolecular bonds between atoms or molecules. Intermolecular forces are electrostatic in nature and hence they work well in polar molecules. As pure hexane is a organic liquid and a non polar one. Intermolecular forces that will work here will be weak in nature. Hence, vander-wall forces(London dispersion force) come into the picture. Hence, it's clear that due to non polar nature of pure hexane, vander-wall forces(London dispersion force) will work between the molecules of pure hexane and they will attract each other by this force.

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Answer:

A. 10

Explanation:

M = n : v (L)

M = 1 × 10^-10 : 1

M = 10^-10

HCl => H^+ + Cl^-

then, the a = 1 ( The amount of Hydrogen ions released during the ionization process)

[H^+] = a × Ma

[H^+] = 1 × 10^-10

[H^+] = 10^-10

pH = -log [H^+]

pH = -log 10^-10

pH = -(-10 × 1)

pH = 10

Well, the pH is 10.

The molarity of the solution containing 0.325 moles of lactic acid in 250.0 mL of solution is 1.3 M (molar).

To determine the molarity of a solution, divide the moles of solute by the liters of solution. In this case, we have 0.325 moles of lactic acid dissolved in 250.0 mL of solution.

First, convert the volume of the solution from milliliters to liters:

250.0 mL * (1 L / 1000 mL) = 0.250 L

Now, use the moles of lactic acid and the liters of the solution to calculate the molarity:

Molarity = moles of solute / liters of solution

Molarity = 0.325 moles / 0.250 L

Molarity = 1.3 M

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a. Magnesium Burns in oxygen.

--⟩it produces light bright enough to blind you temporarily.

b. Calcium carbonate is heated.

--⟩ form calcium oxide and evolve carbon dioxide gas.

c. Hydrogen reacts with nitrogen at necessary condition.

----⟩some of the hydrogen and nitrogen will react to form ammonia.

d. potassium hydroxide reacts with nitric acid.

---⟩When potassium reacts with nitric acid then, potassium displace hydrogen from its solution and becomes colorless liquid.

e. Carbon dioxide is treated with limewater.

---⟩to form a white precipitate (appears milky) of calcium carbonate, CaCO 3.

Hope it is helpful to you

The number of moles of Nickel (II) Nitrate dissolved in 25.0mL of 0.100M solution can be calculated using the following equation: Molarity = moles of solute / volume of solution

Nickel is an element that is found in the Earth's crust and is most commonly used in the form of a silvery-white metal. Nickel has many uses, including being a component in stainless steel, being used to make coins, and being used in the production of batteries. Nickel is also used in the production of catalysts, magnets, electric motors, and jewelry. Nickel is a versatile element that is highly resistant to corrosion, which makes it a valuable material in many industries. Nickel is also important in the environment, as it helps to regulate the production of certain enzymes and hormones in plants and animals.

Thus, moles of solute = Molarity x volume of solution

Therefore, moles of Nickel (II) Nitrate = 0.100M x 25.0mL = 2.50 moles.

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Answer:

neutron number

Explanation:

^

Answer:Please note that specific equations or vapor pressure tables for water vapor are required for precise calculations, and without them, only a general estimation can be made.

Explanation:

To determine the relative humidity in both scenarios, we need to compare the actual amount of water vapor in the air to the maximum amount of water vapor the air can hold at a given temperature.

A. To calculate the relative humidity when the dew point temperature is 55°F and the air temperature is 75°F:

1. Calculate the saturation vapor pressure at the dew point temperature using a vapor pressure table or equation specific to water.

2. Calculate the saturation vapor pressure at the air temperature of 75°F.

3. Divide the actual vapor pressure (saturation vapor pressure at the dew point temperature) by the saturation vapor pressure at 75°F.

4. Multiply the result by 100 to obtain the relative humidity as a percentage.

B. To calculate the relative humidity when the temperature drops overnight to 50°F:

1. Calculate the saturation vapor pressure at the dew point temperature of 55°F.

2. Calculate the saturation vapor pressure at the new air temperature of 50°F.

3. Divide the actual vapor pressure (saturation vapor pressure at the dew point temperature) by the saturation vapor pressure at 50°F.

4. Multiply the result by 100 to obtain the relative humidity as a percentage.

Please note that specific equations or vapor pressure tables for water vapor are required for precise calculations, and without them, only a general estimation can be made.

A. The relative humidity is 80% when the air temperature is 75°F and the dew point temperature is 55°F.

B. If the temperature drops overnight to 50°F, the relative humidity would be approximately 133.33%. .

A. When the dew point is 55°F and the air is 75°F, the relative humidity is as follows:

Determine the specific humidity at saturation at 75 degrees, and Make a relative humidity calculation:

The relative humidity percentage is calculated by multiplying the specific humidity at saturation temperature by the saturation specific humidity at the dew point.

80% relative humidity is calculated as (8 g/kg / 10 g/kg) x 100.

B. Relative humidity when the overnight low temperature is 50°F:

Determine the specific humidity at saturation at 50 °F and Determine the specific humidity at 55°F, which is the dew point temperature:

Assume that the dry air concentration is still 8 grammes per kilogramme (g/kg).

Make a relative humidity calculation:

Divide the specific humidity at the dew point by the saturation specific humidity at the same temperature and multiply by 100 to get the relative humidity percentage.

Relative humidity = (8 g/kg / 6 g/kg) * 100 = 133.33%

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Answer:

the answer is is C 465 grams

Particle size is typically measured in units such as micrometers (µm) or nanometers (nm), which represent very small lengths on the order of thousandths or millionths of a meter, respectively.

4.2 cm is much larger than the typical size of particles and is more in the range of everyday objects.

For example, 4.2 cm is roughly the size of a golf ball or a small tomato. If you have additional information about the particle's size, such as its shape or the material it is made of, I may be able to provide more specific guidance.

Also, a particle that is 4.2 nanometers (nm) in size falls in the range of nanoscale particles, which are typically much smaller than everyday objects and are invisible to the nakεd eye.

The size of the particle can provide some clues about its potential identity or classification, but additional information about its properties, composition, and context is needed to determine its specific identity.

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Answer:

D

Explanation:

Answer:

Outermost zone

Explanation:

Because the outermost zone is the hottest part of the flame.

Answer:

outer most zone

Explanation:

The outermost zone is used by a goldsmith for melting gold and silver. This is because it is the hottest zone of the flame where complete combustion takes place.

Answer:

To prepare 20 mL of 0.25 M HCl from 1.00 M HCl, 5 mL of the 1.00 M HCl is measured and transferred in a volumetric flask or beaker containing about 10 mL of water. Then, water is added to make it up to the 20mL mark.

Explanation:

The question is not correct, because the molarity of HCl cannot be greater than 12.2 M.

Also, a higher concentration of an acid can not be prepared by any dilution method,  but can only be prepared by distillation procedures requiring great care and expertise.

Therefore,  the following assumptions are made about the question :

The initial acid concentration, M1 = 1.00 M

Required acid concentration, M2 = 0.25 M

Volume of required acid solution, V2 = 20 mL

Using the dilution formula: M1V1 = M2V2

Volume of initial acid solution, V1 must be found then.

Making V1 subject of the formula; V1 = M2V2/M1

V1 = 0.25 × 20 / 1.00

V1 = 5 mL

To prepare 20 mL of 0.25 M HCl from 1.00 M HCl, 5 mL of the 1.00 M HCl is measured and transferred in a volumetric flask or beaker containing about 10 mL of water. Then, water is added to make it up to the 20mL mark.

The compound C6H12O6 is glucose and it contains three elements; carbon, hydrogen, and oxygen.

There are six carbon atoms, twelve hydrogen atoms, and six oxygen atoms in one molecule of glucose.

The formula for glucose is C6H12O6, which means that there are six carbon atoms, twelve hydrogen atoms, and six oxygen atoms in one molecule of glucose. Therefore, there are three different elements in the compound C6H12O6.

To summarize, the compound C6H12O6 contains three different elements, namely carbon, hydrogen, and oxygen.

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a. The Lewis structure for SCl₂ is S-Cl-Cl with a lone pair on sulfur. The VSEPR theory predicts a bent or V-shaped molecular geometry.

b. The Lewis structure for PI₃ is P-I-I-I with two lone pairs on the central phosphorus atom. The VSEPR theory predicts a trigonal pyramidal molecular geometry.

c. The Lewis structure for Cl₂CO is O=C=Cl with no lone pairs. The VSEPR theory predicts a linear molecular geometry for Cl2CO.

d. The Lewis structure for NH₂Cl is H-N-Cl with two lone pairs on the nitrogen atom. The VSEPR theory predicts a trigonal pyramidal molecular geometry.

e. The Lewis structure for SiCl₃Br is Br-Si-Cl-Cl-Cl with no lone pairs. The VSEPR theory predicts a trigonal pyramidal molecular geometry.

f. The Lewis structure for ONCl is O=N-Cl with no lone pairs. The VSEPR theory predicts a linear molecular geometry.

To draw the Lewis structure, you need to determine the number of valence electrons for each atom in the molecule and then arrange them to form covalent bonds while fulfilling the octet rule (except for hydrogen, which follows the duet rule). Once the Lewis structure is determined, you can use the VSEPR theory to predict the molecular geometry based on the arrangement of electron pairs around the central atom.

In each case, the molecular geometry is determined by the number of bonding and lone pairs of electrons around the central atom. The VSEPR theory provides a model for predicting the shapes of molecules based on the repulsion between electron pairs.

The molecular geometries predicted by the VSEPR theory are as follows:

a. SCl₂: Bent or V-shaped

b. PI₃: Trigonal pyramidal

c. Cl₂CO: Linear

d. NH₂Cl: Trigonal pyramidal

e. SiCl₃Br: Trigonal pyramidal

f. ONCl: Linear

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The percent concentration of the solution containing 90 grams of NaOH in 750 mL of buffer is 300%.

Mass of NaOH = 90 grams

Molecular weight of NaOH = 40 g/mol

The volume of buffer solution = 750 mL

Converting the volume to litres -

= 750 mL

= 750/1000

= 0.75 L

Calculating the number of moles of NaOH -

= Mass / Molecular weight

= 90  / 40

= 2.25 mol

Calculating the percent concentration -

= (Amount of solute / Total solution volume) x 100

= (2.25 / 0.75 ) x 100

= 3 x 100

= 300

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Ammonia (NH₃) is a weak base.

When dissolved in water, ammonia reacts with water molecules to form ammonium ions (NH₄⁺) and hydroxide ions (OH⁻), according to the following equation:

NH₃ + H₂O ⇌ NH₄⁺ + OH⁻

Ammonia only partially dissociates in water, which means that it produces relatively few hydroxide ions compared to a strong base like sodium hydroxide (NaOH). Therefore, ammonia is considered a weak base.

The strength of a base is determined by its ability to donate hydroxide ions (OH⁻) in water, which is quantified by the base dissociation constant (Kb). The Kb value for ammonia is relatively low (1.8 x 10⁻⁵), compared to strong bases like sodium hydroxide (Kb value of 1.0 x 10¹⁴).

Overall, ammonia can still react with acids to form salts and water, but its reactivity is much weaker than that of a strong base.

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Answer:

It seems believable and familiar.

Explanation:

Plz mark Brainlest

Answer:

motion of molecules because we gonna see which one is in a solid state and what's so ever

Answer:

Bent

Explanation:

pls brainlist

Student 2 employed the correct scientific reasoning which states that a TLC plate might be used to run an unknown drug, and the spots could then be compared to another TLC plate using known compounds.

Chromatography is a biophysical method used for the separation, identification, and purification of different compounds present in mixtures. The main separating components are stationary and mobile phases. TLC stands for thin-layer chromatography. It uses a TLC plate to separate compounds. A TLC plate is made by applying a thin layer of adsorbent on a sheet. It can be carried out on an analytical scale to track the development of a reaction or on a preparative scale to purify minute quantities of the compound. Because of its simplicity, comparatively low cost, great sensitivity, and rapid separation, TLC is an extensively used analytical method. Similar to all chromatography, TLC works on the premise that a compound will have varying affinities for the mobile and stationary phases, which will influence how quickly it migrates. TLC aims to produce well-defined, well-separated spots.

The question is incomplete. The complete question is as follows;

Three students are asked to discuss how thin-layer chromatography could be used to aid in the identification of a compound. which student employs correct scientific reasoning?

Student 1: An unknown compound could be used as the solvent in the TLC plate to determine its identity.

Student 2: An unknown compound could be run on a TLC plate and then the spots could be compared to separate TLC plates of known compounds.

Student 3: An unknown compound could be run on the same TLC plate as a known compound to see if they are the same chemical.

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Answer:

The pressure of a given amount of gas is directly proportional to the temperature at a given volume. When the temperature of a system goes up, the pressure also goes up, and vice versa. The relationship between pressure and temperature of a gas is stated by the Gay-Lussac's law.

1. Unit of pressure called a derived unit because it is a combination of base units (kg·m^-1·s^·2).

2. We measure the volume of milk by a instrument called Milk Lactometer.