Explain with 3 points why the element Ra is bigger than the element Be.

56.5 grams of an unidentified material are put in a graduated cylinder. Lead is the name of the unknown material.

In order to make them lighter and less fragile than glass, large graded cylinders are typically manufactured of polypropylene due to its good chemical resistance or poly methyl pentene due to its transparency. Polypropylene (PP) is simple to repeatedly autoclave; however, autoclaving beyond 121 °C (250 °F) will warp or break polypropylene graduated cylinders, reducing accuracy (depending on the chemical composition; normal commercial grade polypropylene melts above 177 °C (351 °F)).

In order to improve the precision and accuracy of volume measurement, traditional graduated cylinders are typically tall and narrow. It has a "spout" for simple pouring of the measured liquid and a glass or plastic base (stand, foot, support). Another variation is low and wide.

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lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (FR) all have 7 energy levels

sorry if im wrong im kinda fried RN

Answer:

The answer is francium (Fr)

Explanation:

I just took the test

Answer:

Mass measures the amount of matter in a substance or an object. The basic SI unit for mass is the kilogram (kg). Volume measures the amount of space that a substance or an object takes up.

Hope it help

1Kg = 1000g

the molar mass of NaCl = 58.44 g/mol

number of moles = Mass / Molar mass

n = 1000g ÷ (58.44 g/mol)

n = 17.1115 mol

since you want the answer in one decimal place

then number of moles = 17.1 moles

Explanation:

The boiling point of a pure substance is the temperature at which the substance transitions from a liquid to the gaseous phase. At this point, the vapor pressure of the liquid is equal to the applied pressure on the liquid.

Density is intensive because it is the ratio of two extensive properties that is mass to volume.

Density is defined as mass per unit volume. S.I unit if density is kg/m³.

It is expressed as

Density = [tex]\frac{\text{Mass}}{\text{Volume}}[/tex]  or [tex]d = \frac{m}{V}[/tex]

Intensive property is the property which does not depend on the size of the system. Intensive property can be easily identified. Intensive property is the independent property. The size does not change in this.

Example of intensive property are Density, Freezing point, melting point, colour, Lustre, etc.  

Extensive property is the property which depend on the substance. Extensive property cannot be easily identified.

Example of extensive property length, weight, volume, mass etc.

Thus from the above conclusion we can say that Density is intensive because it is the ratio of two extensive properties that is mass to volume.

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Disclaimer: The given question is incomplete on the portal. Here is the complete question.

Question: The density (d) of a substance is an intensive property that is defined as the ratio of its mass (m) to its volume (v)

density = [tex]\frac{\text{Mass}}{\text{Volume}}[/tex]  or [tex]d = \frac{m}{V}[/tex]

Considering that mass and volume are both extensive properties, explain why their ratio, density is intensive.

By definition science is, the intellectual and practical activity encompassing the systematic study of the structure and behavior of the physical and natural world through observation and experiment.

Answer:

digestion

Explanation:

The parasympathetic nervous regulates life-sustaining processes, like digestion, during times when your body is relaxed.

Answer:

Option B

Explanation:

The reaction can be summarized as

6O2+C6H12O6——›6CO2+6H2O+Heat

Answer:

B

Explanation:

Answer:

The food pyramid is just to make people have a healthier "Diet."

Explanation:

It shows the food groups we eat and which ones to put together to make a healthy diet. Eating the right amount of each food group is called a "Balance" diet. Therefore, its not needed, but it is useful.

The concentration of the Nitric acid solution : 0.114 M

Titration is a procedure for determining the concentration of a solution (analyte) by reacting with another solution whose known concentration (usually a standard solution) is called the titrant. Determination of the endpoint/equivalence point of the reaction can use indicators according to the appropriate pH range  

Titrations can be acid-base titration, depositional titration, and redox titration. An acid-base titration is the principle of neutralization of acids and bases  

Reaction

HNO₃ + NaOH → NaNO₃ + H₂O​

Concentration a standard solution  of sodium hydroxide :  0.0998 mol/dm³ , and the volume = 25 cm³

moles NaOH=

[tex]\tt mol=M\times V\\\\mol=0.0998\times 25\\\\mol=2.495~mlmoles[/tex]

From the equation, mol ratio HNO₃ : NaOH = 1 : 1, so mol HNO₃ = mol NaOH=2.495 mlmoles

The volume of HNO₃ = 21.8 cm³, so the concentration :

[tex]\tt M=\dfrac{n}{V}\\\\M=\dfrac{2.495}{21.8}\\\\M=0.114[/tex]

The concentration of the nitric acid solution is 0.11445 mol/dm³

From the question,

We are to calculate the concentration of the nitric acid solution

The given balanced chemical equation for the reaction is

HNO₃ + NaOH → NaNO₃ + H₂O​

This means 1 mole of HNO₃ is needed to completely neutralize 1 mole of NaOH

Using the formula

[tex]\frac{C_{A}V_{A} }{C_{B}V_{B}} = \frac{n_{A}}{n_{B}}[/tex]

Where [tex]C_{A}[/tex] is the concentration of acid

[tex]C_{B}[/tex] is the concentration of base

[tex]V_{A}[/tex] is the volume of acid

[tex]V_{B}[/tex] is the volume of base

[tex]n_{A}[/tex] is the mole ratio of acid

[tex]n_{B}[/tex] is the mole ratio of base

From the given information

[tex]C_{B}= 0.0998\ mol/dm^{3}[/tex]

[tex]V_{A} = 21.80 \ cm^{3}[/tex]

[tex]V_{B} = 25.0 \ cm^{3}[/tex]

From the balanced chemical equation

[tex]n_{A} = 1[/tex]

[tex]n_{B} =1[/tex]

Putting the parameters into the formula, we get

[tex]\frac{C_{A} \times 21.80 }{0.0998 \times 25.0} = \frac{1}{1}[/tex]

Then,

[tex]C_{A} \times 21.80=0.0998 \times 25.0[/tex]

∴ [tex]C_{A}=\frac{0.0998 \times 25.0}{21.80}[/tex]

[tex]C_{A} =\frac{2.495}{21.80}[/tex]

[tex]C_{A} = 0.11445 \ mol/dm^{3}[/tex]

Hence, the concentration of the nitric acid solution is 0.11445 mol/dm³

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Answer:

0.37atm

Explanation:

Given parameters:

Initial pressure  = 0.25atm

Initial temperature  = 0°C  = 273K

Final temperature  = 125°C  = 125 + 273  = 398K

Unknown:

Final pressure  = ?

Solution:

To solve this problem, we use a derivative of the combined gas law;

           [tex]\frac{P1}{T1}[/tex]  = [tex]\frac{P2}{T2}[/tex]

  P and T are pressure and temperature

  1 and 2 are initial and final values

        [tex]\frac{0.25}{273}[/tex]   = [tex]\frac{P2}{398}[/tex]  

         P2  = 0.37atm

Answer:

Loss of energy to a colder material. Ice forms at 32°F /0° C.

Explanation:

As water cools, the natural movement between the molecules slows until it changes to a solid state (just as it boils to gas if they become too active). This movement doesn't completely stop until the material hits "absolute zero" at -460°F /-273° C. (0° Kelvin).

That's about the temperature "in the shade" in outer space.

A more interesting question would be, "why does water expand when it freezes?" The H - two - O molecule forms a triangle (with the O in the middle).

As it cools, the angle formed by the two H's gets larger. At around 36°F /2° C , the shrinking space between molecules gets overwhelmed by the expanding size of each molecule.

So, for those last few degrees before freezing, the overall volume gets bigger instead of continuing to decrease.

That's what causes potholes in roads (water settles into cracks, then makes the crack larger as it freezes). It's what damages the eaves trough around your roof, breaks leaves down into topsoil and splits boulders in half.

Answer:

HBr

Explanation:

Answer:

D

Explanation:

The chemical reaction is most likely the slowest will be rocks are eroded by acid rain.

A chemical reaction occurs that involves the chemical change of one group of chemical compounds into another series of chemical substances.

Acid rain was the rain that has an overabundance of acids.

The chemical reaction is most likely the slowest will be rocks are eroded by acid rain.

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Answer:

Explanation:

I am sorry but please give detailed question

Answer:

Step 1 − Divide the decimal number to be converted by the value of the new base.

Step 2 − Get the remainder from Step 1 as the rightmost digit (least significant digit) of new base number.

Step 3 − Divide the quotient of the previous divide by the new base.

Step 4 − Record the remainder from Step 3 as the next digit (to the left) of the new base number.

Repeat Steps 3 and 4, getting remainders from right to left, until the quotient becomes zero in Step 3.

Explanation:

Answer:98.1 meters = 98,100 mm

Explanation: 1 meter = 1,000 mm.

Answer:

The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).

Explanation:

HOPE THIS HELP

PICK ME AS THE BRAINLIEST

Answer:

by the looks of it the answer you have is correct

Explanation:

Answer:

The answer B

.

Explanation:

Answer:

Answer is D. Just took the quiz on A P E X

Explanation:

If oxidation states change, it is a redox reaction. Hence, option D is correct.

Oxidation-reduction reactions are balanced by two half overall chemical equations into an oxidation equation and a reduction equation.

In redox reactions, the half-reactions of oxidation and reduction always occur simultaneously in pairs.

The oxidation half-reaction involved the loss of electrons from a reduced substance (A) to form an oxidized substance (A⁺):

A ⇒ A⁺ + e-

In contraposition, during the reduction half-reaction the oxidized substance (B⁺) gains electrons to form the reduced substance (B):

B⁺ + e- ⇒ B

The overall redox reaction is obtained by the addition of the two half-reactions:

A ⇒ A⁺ + e-

B⁺ + e- ⇒ B

A + B⁺⇒ A⁺ + B

The electrons gained by B are provided by A, which lost the same number of electrons. Thus, the oxidation/reduction reactions are paired.

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Florine has a smaller atomic radius than oxygen

Atomic radius or Atomic Radii is the total distance from the nucleus of an atom to the outermost orbital of its electron and in the given element oxygen and Florine, Florine has the smallest atomic radius because in moving from left to right across a period, the atomic radius decreases as the effective nuclear charge increases and because of greater positive charge of the nucleus, pulling electron and electron shell in closer. therefore, the Florine has smallest atomic radius than oxygen atomic radii of oxygen is 48pm.

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The two senses which is require in the chemical compounds be dissolved in solution before they can act as stimulants for these senses are smell and odour.

Stimulant for smell include molecules which are dissolved in the air gas easily, can be easily detected by the odour recepters which are located on the nostrils upon binding. The smell neurons transfer this information to the smell bulb which are located in the forebrain all the olfactory process occur.

The sensation of taste occur when our food is dissolved in the saliva secreted by the salivary gland located below the tongue. This food dissolved in saliva binds with the recepters of the tongue which are located on the taste buds of papillae.

Thus, we concluded that the two senses which is require in the chemical compounds be dissolved in solution before they can act as stimulants for these senses are smell and odour.

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Answer:

Black

Explanation:

White color reflects visible light while Black absorbs all light, and gives heat, so the answer is Black!

Answer:the answer is C

Answer:

C

Explanation:

I'm doing this test now and I just got it right :)

Answer:

(A)

Explanation:

It decreases cuz when they start climbing a mountain there air pressure is getting low and so is their blood. The higher they go the more it decreases. Hope this helps:)!

The atom's nucleus is composed of neutrons and protons. BOTH: In the nucleus. Contribute to the mass of the atom. Mass equal 1 amu. PROTON. Number is atomic number of element. Determine the identity of the atom. NEUTRON: Neutral charge.

Subatomic particles are matter structures that are smaller in size than an atom. Hence, subatomic particles compose the atoms, determining their properties.

Many subatomic particles are unstable and remain unknown. However, three of them are the most stable ones,

Subatomic particles can be either,

Neutrons and protons compose the nucleus of the atoms, while electrons orbit around them.

These particles differ in their electric charge and their mass.

The number of protons in the atom is the atomic number and determines the atom's identity.

The massic number is the addition of the number of protons and the number of neutrons.

Atomic mass is composed of neutrons and protons mass. It is not the same as the massic number or the atomic weight.

When protons, neutrons, and electrons get together to form an atom, they lose part of their mass as energy. This is why the atomic weight is slightly inferior to the sum of masses.

1) BOTH

In the nucleus

Contribute to the mass of the atom

Mass equal 1 amu (1.67377 x 10⁻²⁷ kg or 1.67377 x 10⁻²⁴ g)

2) PROTON

Number is atomic number of element

Determine the identity of the atom

3) NEUTRON

Neutral charge

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Answer:

When you read a scale on the side of a container with a meniscus, such as a graduated cylinder or volumetric flask, it's important that the measurement accounts for the meniscus. Measure so that the line you are reading is even with the center of the meniscus. For water and most liquids, this is the bottom of the meniscus. For mercury, take the measurement from the top of the meniscus. In either case, you are measuring based on the center of the meniscus. For a flat meniscus, make sure the liquid is level. Usually placing the container on a lab bench does the trick.

You won't be able to take an accurate reading looking up at the liquid level or down into it. Get eye level with the meniscus. You can either pick up the glassware to bring it to your level or else bend down to take measurements in situations where you're concerned with dropping the container or spilling its contents.

Use the same method to take measurements each time so that any errors you make will be consistent.

Explanation: