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Answer:

144 g of phosphorus contain 4.65 moles.

Explanation:

Given data:

Mass of phosphorus (P) = 144 g

Number of moles = ?

Solution:

Formula:

Number of moles = mass/ molar mass

Molar mass of phosphorus is 31 g/mol

Now we will put the values in formula.

Number of moles = 144 g/ 31 g/mol

Number of moles = 4.65 mol

Thus, 144 g of phosphorus contain 4.65 moles.

Answer:

the mass will sink.

Explanation:

because the block of material is still more dense.

Answer:

C

Explanation:

The same types of atoms

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The correct option is option C.

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.

In the nucleus of an atom, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The two samples of the element mercury (Hg) will have same type of atoms.

Therefore, the correct option is option C.

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Answer:

26.66kg

Explanation:

If a person has a mass of 80kg, then they will weigh 80kg x 9.8m/s^2 or 784 Newtons on the Earth. That same person would weigh 80kg x 9.8m/s^2/3 or 261.33 Newtons on Mars, which the person might think was 26.66 Kg (although he would be incorrect since his mass has not changed).

Answer:

nucleosynthesis. A star's mass determines what other type of nucleosynthesis occurs in its core (or during explosive changes in its life cycle).

Answer:

They go extinct

Explanation: When something is on earth and it gets used so much and then it's not in earth anymore that means it was used to much it went extinct (Take dinosaurs for example besides there death)

The elements no longer found on earth are extincted.When something is on earth and it gets used so much and then it's not in earth anymore that means it was used to much it went extinct.

An element is a atom's species that consist of proton in a proper number embeded in their nuclei, as well as pure substance a species consist of pure substance.

Carbon is an element which is a chemical by nature and it is represented by C and the atomic number of carbon is 6.The atomic structure of carbon is designed in such way that it contain 6 electron, 6 protons, and 6 neutrons.

The atomic mass of carbon is 12.011 u and the carbon contain 2, 4 electrons per shell with the electronegativity of 2.55 .The main function of carbon compounds to maintain earth's atmosphere and temperature and to supply energy that works as fuel for our economy.

The atomic structure of carbon is designed in such way that it contain 6 electron, 6 protons, and 6 neutrons.The atomic mass of carbon is 12.011 u and the carbon contain 2, 4 electrons per shell with the electronegativity of 2.55 .

Therefore,The elements no longer found on earth are extincted.When something is on earth and it gets used so much and then it's not in earth anymore that means it was used to much it went extinct.

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Answer:

Density of Radon is  5.44 g/.

Explanation:

Given data:

Temperature of gas = 100°C (273+100 = 373 K)

Pressure of gas = 0.75 atm

Density of gas = ?

Solution:

First of all we will derive the formula.

We know that,

PV = nRT

and

n = m/M    (m = mass, M = molar mass)

PV = (m/M) RT

PVM =  (m/M) RT ×M

PVM = mRT

PVM/V = mRT/V

PM = dRT            (m/V = d)

Now we will put the values in formula:

Molar mass of Radon is 222 g/mol .

0.75 atm ×222 g/mol = d× 0.0821 atm.L/mol.K ×373 K

166.5 atm.g/mol = d×30.62 atm.L/mol

d = 166.5 atm.g/mol / 30.62 atm.L/mol

d = 5.44 g/L

Answer:The amount of product will be higher than the amount of substrate at equilibrium

Explanation:

Recall that the equilibrium constant K depends on the amounts of reactants and products present in the system at equilibrium.

Considering the equation; K = [X]/[Y], as the concentration of X increases above that of Y, the equilibrium constant K becomes very high, hence the answer above.

Answer: The answer is D.

Explanation:

As the air rushes toward the center, it winds up moving in a curved path thanks to the Coriolis effect. This creates a circular spinning pattern as air travels from areas of high pressure to low pressure. That's why hurricanes originating in the northern hemisphere rotate counterclockwise.

Hope this helps!

Answer:

lithosphere

Explanation:

I am big Brain

Answer:

a) 0.30

Explanation:

Kc = [C] [D] / ([A] [B])

Set up an ICE table:

[tex]\left[\begin{array}{cccc}&Initial&Change&Equilibrium\\A&0.4&-x&0.4-x\\B&0.4&-x&0.4-x\\C&0&+x&x\\D&0&+x&x\end{array}\right][/tex]

Plug in values and solve:

9 = x² / (0.4 − x)²

3 = x / (0.4 − x)

1.2 − 3x = x

1.2 = 4x

x = 0.3

Answer:

Formula weight of H₂O molecule is  18.02 amu.

Explanation:

Given data:

Formula weight of H₂O = ?

Atomic mass of H = 1.008 amu

Atomic mass of O = 16.00 amu

Solution:

Formula weight:

"It is the sum of all the atomic weight of atoms present in given formula"

Formula weight of H₂O = 2×1.008 amu + 1×16.00 amu

Formula weight of H₂O = 18.02 amu

Thus, formula weight of H₂O molecule is  18.02 amu.

Answer:

I cant see it clearly

Explanation:

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Answer:

I believe D is the best answer choice.

Explanation:

C is also a good answer but I feel like D most accurately describes the scientific method.

Answer:

C

Explanation:

its true and contains more academic words and i got it right

Answer:

4.81×10¹⁰ atoms.

Explanation:

We'll begin by converting 3.2 pg to Ca to grams (g). This can be obtained as follow:

1 pg = 1×10¯¹² g

Therefore,

3.2 pg = 3.2 pg × 1×10¯¹² g / 1 pg

3.2 pg = 3.2×10¯¹² g

Therefore, 3.2 pg is equivalent to 3.2×10¯¹² g

Next, we shall determine the number of mole in 3.2×10¯¹² g of Ca. This can be obtained as follow:

Mass of Ca = 3.2×10¯¹² g

Molar mass of Ca = 40.08 g/mol

Mole of ca=.?

Mole = mass /molar mass

Mole of Ca = 3.2×10¯¹² / 40.08

Mole of Ca = 7.98×10¯¹⁴ mole.

Finally, we shall determine the number of atoms present in 7.98×10¯¹⁴ mole of Ca. This can be obtained as illustrated below:

From Avogadro's hypothesis,

1 mole of Ca contains 6.02×10²³ atoms.

Therefore, 7.98×10¯¹⁴ mole of Ca will contain = 7.98×10¯¹⁴ × 6.02×10²³ = 4.81×10¹⁰ atoms.

Therefore, 3.2 pg of Ca contains 4.81×10¹⁰ atoms.

Explanation:

de Broglie wavelength= h/mv

v=h/m x de Broglie wavelength

v= (6.626× 10^-34)/ (2347× 1.27 × 10^-38)

v= 22.229 m/s(according to Google scientific calculator)

am sorry I don't hv a calculator at hand

Answer:

Ni ➡️Nickel

Explanation:

The element that is most

likely to be both conductive AND magnetic in nature is "Nickel".

Nickel is a popular magnetic metal and it is known to be ferromagnetic. It's valuable in alloys and used in the production of stainless steel. The element belongs to the transition metals - hard, malleable and ductile. It has high electrical and thermal conductivity.

The element finds usefulness in batteries, phones, kitchen tools, jewellery, etc.

Answer:

evaporation

Explanation:

Answer:

boiling (or vaporization)

Explanation:

At a certain temperature, the particles in a liquid have enough energy to become a gas. This process of a liquid becoming a gas is called boiling (or vaporization.)

Answer:

Explanation:

To find the original pressure we use the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the original pressure

[tex]P_1 = \frac{P_2V_2}{V_1} \\[/tex]

From the question

V1 = 20 L = 20,000 mL

P2 = 560.0mmHg

V2 = 15700mL

We have

[tex]P_1 = \frac{560 \times 15700}{20000} = \frac{8792000}{20000} = \frac{2198}{5 } \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Neutron star collisions

Answer:

B I already know this

Explanation:

Answer:

The seven SI base units, which are comprised of:

Length - meter (m)

Time - second (s)

Amount of substance - mole (mole)

Electric current - ampere (A)

Temperature - kelvin (K)

Luminous intensity - candela (cd)

Mass - kilogram (kg)

Explanation:

Answer:

The seven SI base units, which are comprised of:

* Length - meter (m)

* Time - second (s)

* Amount of substance - mole (mole)

* Electric current - ampere (A)

* Temperature - kelvin (K)

* Luminous intensity - candela (cd)

* Mass - kilogram (kg)

Explanation:

Hope this helps :)

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Answer: DNA, developmental similarity, and similarities in body structure.

Answer:

the answer is

-DNA

-Development

-Similarity

-Similarities in body structure

Explanation:

I hope this helped have a good day❤

Answer:

Explanation:

Compound are substances which can be formed by chemically combining two or more elements. Mixtures are substances that are formed by physically mixing two or more substances.

Answer:

Question not very specific, but here is an answer you might be looking for. Density of object at 2 degrees C, 0.99997 g/mL. Hope it IS the answer you are looking for!

Explanation:

Answer:

II and IV.

Explanation:

To know which option is correct, do the following:

Energy (E) and frequency (f) are related by the following equation:

E = hf

Where:

E is the energy.

h is the Planck's constant.

f is the frequency.

From the equation E = hf

Energy is directly proportional to the frequency. This implies that an increase in the frequency will also increase the energy and a decrease in the frequency will also decrease the energy.

Therefore, (II) in the question above is correct.

Velocity (v), wavelength (λ) and frequency (f) are related by the following equation:

v = λf

Divide both side by λ

f = v/λ

Thus, we can see clearly that the frequency is inversely proportional to the wavelength. This means that an increase in frequency will decrease the wavelength and a decrease in frequency will increase the wavelength.

Therefore, (IV) in question above is correct.

Thus, II and IV are the correct answers.

Answer:

metal

Explanation:

Answer:

The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).

Explanation:

The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).

Explanation:

The atomic number is number on the right side

Answer: B.

Explanation:

The nucleus is a membrane-enclosed organelle found in most eukaryotic cells. The nucleus is the largest organelle in the cell and contains most of the cell's genetic information (mitochondria also contain DNA, called mitochondrial DNA, but it makes up just a small percentage of the cell's overall DNA content).

Hope this helps!

Answer:

nuke-leus

Explanation: