How many grams are there in 4.4 moles of calcium, Ca?

The frequency of a radio wave was measured to be ( 3.1 x [tex]10^8[/tex] ) Hz . The  energy of the radio wave in kilojoules ( kJ ) is  20.5   x [tex]10^{-29}[/tex] kJ .

The radio waves are the types of the electromagnetic radiation .

Calculation ,

given frequency of radio wave ( v ) = 3.1 x [tex]10^8[/tex]  Hz

plank's constant ( h ) = 6.626 x [tex]10^{-34}[/tex] J.s ( given )

Formula used : E = hv

where h = plank's constant

v = frequency of radio wave

Now putting the value of all in equation ( i ) we get ,

E =  6.626 x [tex]10^{-34}[/tex] × 3.1 x [tex]10^8[/tex]  

E = 20.5   x [tex]10^{-29}[/tex] kJ

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Answer:

East

Explanation:

Given Newton's third law of motion; "Action and reaction are equal and opposite", when a student jumps off a sled toward the west after it stops at the bottom of an icy hill, the sled will move in the East direction.

This is because, the force exerted on the sled is a reaction force and is opposite in direction to the force that thrusts the boy westward though equal in magnitude with the former.

Answer:

b 2,3,1

Explanation:

2 Al + 3 S ----> Al2S3

Answer:

Well, there are a few reasons to be curious..

Being curious can: Keep your mind active instead of passive.

Keeps your mind observant on new ideas.

It also opens up new possibilities and keeps you creative.

You can have more excitement and mysteries in life!

Explanation:

Answer: I think you need to be curious because that is how we explore things. Many people find things interesting and if you don't inspect basically you will never learn to question right or wrong things.

Explanation:

Answer:

The correct answer is 29 grams.

Explanation:

Based on the given question, the reaction will be,

CH3CH=CHCH3 + H2 ⇒ CH3CH2CH2CH3

The molecular weight of butene is 56 grams per mole, and the molecular weight of butane is 58 grams per mole.

Thus, it can be said that 56 grams of butene reacts with hydrogen gas and produces 58 grams of butane.

Therefore, 28 grams of butene when reacts with hydrogen gas to give,

= 58/56 * 28 = 29 grams of butane.

Hence, the mass of butane produced will be 29 grams.

The modern astronomer who provided insight into the physical phenomena of inertia through careful experiments was Galileo Galilei, who showed by empirical evidence the heliocentrism to left in the past the erroneous earthcentrism idea.

Galileo Galilei was one of the most important astronomers in history who showed through careful experimentation that the Earth orbit around the Sun, which is known as heliocentrism.

In conclusion, the modern astronomer who provided insight into the physical phenomena of inertia through careful experiments was Galileo Galilei, who showed by empirical evidence the heliocentrism to left in the past the erroneous earthcentrism idea.

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Answer:

a

They form an ionic bond by exchanging two electrons.

Explanation:

Magnesium loses two electrons and oxygen gains these electrons so ionic bond is formed

The statement that best describes how magnesium (Mg) and oxygen (O) bond is, "they form an ionic bond by exchanging two electrons." This is further explained below.

Generally, bonding is the process of firmly connecting items together using adhesive, heat, pressure, or chemical bonding.

In conclusion, When magnesium (Mg) and oxygen (O) bond, they form an ionic bond by exchanging two electrons

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Answer:

Elemental gold to have a Face-centered cubic structure.

Explanation:

From the information given:

Radius of gold = 144 pm

Its density = 19.32 g/cm³

Assuming the structure is a face-centered cubic structure, we can determine the density of the crystal by using the following:

[tex]a = \sqrt{8} r[/tex]

[tex]a = \sqrt{8} \times 144 pm[/tex]

a = 407 pm

In a unit cell, Volume (V) = a³

V = (407 pm)³

V = 6.74 × 10⁷ pm³

V = 6.74 × 10⁻²³ cm³

Recall that:

Net no. of an atom in an FCC unit cell = 4

Thus;

[tex]density = \dfrac{mass}{volume}[/tex]

[tex]density = \dfrac{ 4 \ atm ( 196.97 \ g/mol) (\dfrac{1 \ mol }{6.022 \times 10^{23} \ atoms})}{6.74 \times 10^{-23} \ cm^3}[/tex]

density d = 19.41 g/cm³

Similarly; For a  body-centered cubic structure

[tex]r = \dfrac{\sqrt{3}}{4}a[/tex]

where;

r = 144

[tex]144 = \dfrac{\sqrt{3}}{4}a[/tex]

[tex]a = \dfrac{144 \times 4}{\sqrt{3}}[/tex]

a = 332.56 pm

In a unit cell, Volume V = a³

V = (332.56 pm)³

V = 3.68 × 10⁷ pm³

V  3.68 × 10⁻²³   cm³

Recall that:

Net no. of atoms in BCC cell = 2

∴

[tex]density = \dfrac{mass}{volume}[/tex]

[tex]density = \dfrac{ 2 \ atm ( 196.97 \ g/mol) (\dfrac{1 \ mol }{6.022 \times 10^{23} \ atoms})}{3.68 \times 10^{-23} \ cm^3}[/tex]

density =17.78 g/cm³

From the two calculate densities, we will realize that the density in the face-centered cubic structure is closer to the given density.

This makes the elemental gold to have a Face-centered cubic structure.

Answer:

5 valence electrons

Explanation:

Answer:

5 electrons

Explanation:

Because atomic number of Nitrogen is 7 total 7 electrons are present 2 in first shell and 5 in valence shell

So these 5 electrons are known as valence electrons

Answer: yes

Explanation: I feed grasshoppers to frogs

Answer:

My hypothesis is that: If the electrolyte source is changed (potato, apple, lime, lemon), then the production of energy (measured in volts) using a lemon will produce the highest voltage because the acid content in the fruit or vegetable will produce electricity when in contact with the electrodes (both zinc and copper

Explanation:

The mass of the aluminum sample is 52 g.

The mass of the aluminum is determined by applying the principle of conservation of energy as shown below.

heat lost by aluminum = heat gained by water

m₁c₁Δθ₁ = m₂c₂Δθ₂

where;

m₁(0.897)(93.2 - 17.8) = (300)(4.186)(17.8 - 15)

m₁(0.897)(75.4) = (300)(4.186)(2.8)

67.634m₁ = 3516.24

m₁ = 3516.24/67.634

m₁ = 52 g

Thus, the mass of the aluminum sample is 52 g.

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Answer:

b

Explanation:

Answer:

hot dog

Explanation:

Answer:

a) A1₂S₃ + 6H₂O → 3H₂S + 2Al(OH)₃ +3H₂S

b) 5.72grams of aluminum hydroxide.

It demonstrates that each molecule of aluminum sulfide yields two molecules of aluminum hydroxide, or two molecules of Al(OH)3 for every molecule of aluminum sulfide.

Al(OH)3 has a molecular weight of 78 while Al2S3 has a molecular weight of 150. Starting with 5.5 grams of aluminum sulfide, we can set up the ratio by dividing it by 150 to get x/156.

5.5/ 150 = x/156

where x represents the quantity of Al(OH)3 that was created.

Since two moles of Al(OH)3 are created for every mole of Al2S3 that reacts, we utilize 156, which is twice as much as 78. As a result, we arrive at x = (5.5)(156)/150 = 5.72 gm. To the nearest decigram, we obtain 5.72grams of aluminum hydroxide.

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Answer:

53.96g

Explanation:

Given parameters:

Number of moles  = 1.52mole

Unknown:

Mass of the given mole  = ?

Solution:

The given element is chlorine;

        Mass of chlorine  = number of moles x molar mass

 Molar mass of chlorine  = 35.5g/mol

   So;

        Mass of chlorine  = 1.52 x 35.5 = 53.96g

Answer:

B. Protons and Electrons

Explanation:

Protons have a positive charge and electrons have a negative charge. When an element contains the same number of both of those particles the charges will cancel out leaving the atom with a neutral charge, as neutrons already have a neutral charge.

Answer:

ATP is a stored form of energy

Explanation:

it is the main source of this

Answer:

pollution cloud. im not really sure but hope this helps

Explanation:

Dimethylglyoxime is reacted with nickel ion solution. If it gives red precipitate then nickel ions are confirmed to be present.

Sodium hydroxide solution is been added to Copper Sulphate first in little and then in excess. A pale blue soluble precipitate is formed. This confirms presence of Cu²+.

CuSO4 + 2NaOH → Na2SO4 + Cu(OH)2

when nitric oxide reacts with oxygen GIVES Nitrogen dioxide.

NO(g)+ [tex]0_2[/tex]=2N[tex]O_2[/tex] is the balanced reaction

here, from the above reaction, we have found that

1 mole of NO and 2 mole of [tex]0_2[/tex] gives 2 mole of N[tex]O_2[/tex]

from the mole concentration, we can conclude that oxygen is limiting reactant.

A limiting reactant is an active ingredient in a reaction that is totally consumed by its conclusion. The limiting reactant determines how much product is produced in a chemical process.

In a chemical reaction, the reactants react in a stoichiometric sequence to produce the products. The limiting reactant is the one that is present in lower stoichiometric amounts. The amount of the product created depends on how much of the limiting reactant is used up in the reaction. Excess reactants are the additional reactants in the reaction besides the limiting reactants.

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Answer:

Observing. This is the most basic skill in science. ...

Communicating. It is important to be able to share our experiences. ...

Classifying. After making observations it is important to notice similarities, differences, and group objects according to a purpose. ...

Inferring. ...

Measuring. ...

Predicting.Explanation:

hope this he;lp

pick me a the brainliest

Answer:

4

Explanation:

The Atomic number of beryllium is 4, which means that it has 4 protons.

Answer:

Q8) True

Q9) First ionization energy

Q10) Metal oxides

Explanation:

A common property of group one elements (alkali metals) is their combination with water to form basic solutions. E.g 2K(s)+2H2O(l)→2KOH(aq)+H2​(g).

The distance of the outermost electron in the atom from the nucleus is inversely related to the first ionization energy. As the distance between the outermost electron and the nucleus in group 17 elements gets larger, the corresponding first ionization energies of elements in the group gets smaller.

Group 1 elements can combine with oxygen to give metal oxides. E.g  4K + O2 --> 2 K2O

It would make the planet's tilt harder to change, which would mean a more stable climate, which “just means maybe ice ages wouldn't happen as often,” he told me.

The average weather throughout a region's long term, usually 30 years, is called the climate. More precisely, it is the mean and variability of meteorological variables over a period of time that can range from a few months to many millions of years. Temperature, humidity, air pressure, wind speed, and precipitation are a few of the meteorological parameters that are frequently observed.

Climate, in a larger sense, refers to the interactions between the atmosphere, hydrosphere, cryosphere, lithosphere, and biosphere as well as their status as parts of the climate system. Latitude/longitude, topography, altitude, land use, and the presence of surrounding water bodies and their currents all have an impact on a place's climate.

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Answer:

HCl

Explanation:

Volume = 25L

Temperature = 25.0 oC + 273 = 298 K (Converting to kelvin units)

Pressure = 1.2 atm

Mass of gas = 44.7g

Formular of gas = HX

To solve this, we have to know the identity of X. One qay to do that is by obtaining the molecular mass of the compound.

To get the molar mass, we need the number of mole.

Using the ideal gas equation;

PV = nRT

where R = gas constant = 0.082 057 L atm K−1  mol−1

n = PV / RT

n = 1.2 * 25  / 0.082 057 * 298

n = 30  /  24.45

n = 1.227 mol

The relationship between number of moles and molar mass is given as;

Nummber f moles = mass  / molar mass

Molar mass = mass  / Number of moles

Molar mass = 44.7 / 1.227

Molar mass =  36.43 g/mol

Molar mass of gas X = Molar mass of H + Molar mass of X

36.43 = 1 + X

X = 36.43 - 1 = 35.43

Chlorine is the only element with molar mass approximate to 35.43

Hence X = Cl

The chemical formular = HCl

So to answer this question first let's decribe precision vs accuracy.

Precision in this case means exact and accurate; in this scenario all of the dots next to each other mean that it is highly precise.

Whereas Accuracy means aiming for the middle of the circle in this case. Thus   the accuracy is low, but the precision is high.

TLDR: It is highly precise but not accurate.

Look up "Accuracy vs. Precision: What’s the Difference?" for a better detailed example and solution.

Answer:

what are the options? I'll edit my answer to the correct one once you inform me lol