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Answer:

radioactive decay

Explanation:

a study reveals that only about half of our planets internal heat stems from natural radioactivity the rest is primordial heat left over from when earth first coalesced from a hot ball of gas dust and other material

Answer:

Three atoms of magnesium can have different masses because each of the three atoms has a different number of neurons.

I hope this helped :)

The differences in masses of the three magnesium atom is due to there differences in there neutron number

Isotopes are members of an element that all have the same number of protons but different numbers of neutrons.

These are 2 or mores type of atoms that have the same atomic number but different nucleon numbers due to the different number of neutron in the nuclei.

The reason why three atoms of magnesium has different masses is due to Isotropy.

The differences in masses of the three magnesium atom is due to there differences in there neutron number.

The differences in masses is caused by the differences of their neutron number.

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There are 1.204 x 10¹⁹ atoms O

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.  

1 mol of molecule Na₂C₂O₄ :

There are 4 mol of O in 1 mol of molecule Na₂C₂O₄

So for 5 x 10⁻⁶ mol Na₂C₂O₄ :

[tex]\tt mol~O=4\times 5.10^{-6}=2.10^{-5}[/tex]

1 mole = 6.02.10²³ particles , so number of atoms O :

[tex]\tt 2\times 10^{-5}\times 6.02\times 10^{23}=1.204\times 10^{19}[/tex]

Answer:

A

Explanation:

They have generally high melting point compared to covalent compounds because they are formed by electrostatic force of attraction between two opposite charge is not easy to melt them in low melting point.

Ionic compounds have high melting and boiling points. Therefore, option A is not a property of ionic compound. Hence, option A is the correct answer.

Ionic compounds are neutral compounds. Ionic compounds are formed from cations and anions. Positively charged ion (cation) and negatively charged ion (anion) are held together with strong ionic bond.  Some main properties of ionic compounds are,

Thus, we can conclude ionic compounds have high melting and boiling points. Hence, option A is the correct answer.  

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Answer:

it number 3 it's made up of total 11 atoms of 3 different elements .

Answer:

c

Explanation:

Answer:

a task that is performed for payment

Explanation:

all of the other answers do not pertain to the question

A service is best defined as a task that is performed in exchange for payment.

A task is an activity that needs to be accomplished within a defined period of time or by a deadline to work towards work-related goals, usually done in exchange for payment.

Thus, we can conclude that, a service is best defined as a task that is performed in exchange for payment.

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#SPJ2

Answer:

It would be working properly and providing her energy for her daily activities.

Explanation:

Hello!

In this case, since her oxygen is actually working properly, it is going to be travelling throughout her entire body (via blood) and therefore carbon dioxide would be released as the exhalation product due to cellular respiration carried out in the alveoli which provides energy for her daily activities.

However, the intrusion of different molecules to oxygen into her cells may affect the rate at which cellular respiration is carried out and therefore she may feel tired because such process provides energy to the body.

Best regards!

Answer:

27 days, 7 hours and 43 minutes.

Explanation:

To complete a full orbit around Earth, it takes 27 days, 7 hours and 43 minutes for the Moon. This is called sidereal month and is measured by the Moon's position relative to distant *fixed" stars.

Answer:

2grams as per the question

Answer:

A

Explanation:

A is the correct answer once the warm, moist air moves into the cold, dry air, the thunderstorm will start to develop and gradually get larger.

Answer:

98

Explanation:

Based on the reaction:

NaOH + H2SO4 → NaHSO4 + H2O

Where 1 mole of the base (NaOH) reacts per mole of the acid (H2SO4)

The formula of equivalent weight is:

Equivalent weight = Molecular mass / Number of equivalent moles

Where Molecular mass of sulfuric acid is 98g/mol

And number of equivalent moles = 1 -Because 1 mole of acid reacts per mole of base

Equivalent weight is:

98 / 1 =

98

The car's velocity after 5s : 10 m/s

Given

velocity=v=72 km/h=20 m/s

time=t = 5 s

acceleration=a = -2 m/s²

Required

velocity after 5s

Solution

Straight motion changes with constant acceleration

[tex]\tt v_f=v_i+at[/tex]

vf=final velocity

vi = initial velocity

Input the value :

[tex]\tt v_f=20+(-2).5\\\\v_f=20-10\\\\v_f=10~m/s[/tex]

The car is decelerating (acceleration is negative) so that its speed decreases

Answer:

The Velocity after 5s if its acceleration is -2m/s is 10 m / s.

Explanation:

The motion equation is given by v = u + a x t.

Initial speed (u) is equal to 72 km/h.

Acceleration (a) equals 2 m/s2.

Time (t) = 5s.

Changing the initial velocity's direction from km/h to m/s:

1 km/hr is equal to 1000 m/3600 s/5/18 m/s.

velocity (u) is equal to 72 x (5 / 18) m/s, or 20 m/s.

The motion equation can be used to calculate final velocity.

To change values in the equation of motion, do the following:

Final Velocity (v) = u + a x t

v = u + a x t

v = 20 m/s + (-2 x 5) m/s

v = (20 - 10)m/s v = 10 m/s

As a result, the car's speed after 5 seconds will be 10 m/s.

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Answer:

I'm pretty sure the answer is ATP

Explanation:

Answer:

A. ATP

To be more specific, 38 ATP is the product of cellular respiration

Explanation:

Explanation:

Fnet = ma

Therefore a = Fnet/m = 2.4N/0.94kg = 2.45m/s².

Answer:

2.6  m/s2

Explanation:

Answer:

Number of moles = 1.57 mol

Explanation:

Given data:

Mass of propanol = 94.1 g

Molar mass of propanol = 60.1 g/mol

Number of moles of propanol = ?

Solution:

Formula:

Number of moles = mass/molar mass

by putting values,

Number of moles = 94.1 g/ 60.1 g/mol

Number of moles = 1.57 mol

Answer:

8.235 kg

Explanation:

Mass of the cylinder = 4.8 kg

The capacity (volume) of the cylinder = 50 liters

As 1 m^3 = 1000 liters

So, the volume of the cylinder, v= 0.05 m^3

The volume of filled nitrogen, v= 0.05 m^3

Pressure of filled nitrogen, p = 60 atm = 60\times 101325 Pa

Assuming that the nitrogen gas is at room temperature which is 25-degree centigrade,

So, the temperature of nitrogen gas, T=273+25= 298 K

By using the ideal gas equation, pv=nRT

Where n is the number of moles, R is the universal gas constant, R = 8.314 J/mol·K

Putting all the values in the ideal gas equation, we have

(60 x 101325)0.05 = n (8.314) x (298)

n= (60 x 101325 x 0.05)/(8.314 x 298)

n=122.69 moles

As the  molar mass of nitrogen is 28, so the total mass of the nitrogen in the cylinder, m= 122.69 x 28 = 3435.32 grams = 3.435 kg.

Hence, the new mass of the cylinder = 4.8+3.435=8.235 kg

Answer:

Decomposition reaction.

There's heating of solid Ammonium nitrate to form di nitrogen oxide and water

The complete question is attached to this answer

Answer:

2.75 * 10^-5 m

Explanation:

The energy of the absorbed photon = ΔE

ΔE = - Ry (1/n^2 final - 1/n^2initial)

Given that Ry = 2.18 *10^-18 J

nfinal = 9

ninitial =8

ΔE = - 2.18 *10^-18 (1/9^2- 1/8^2)

ΔE = - 2.18 *10^-18 (0.0123 - 0.0156)

ΔE = 7.194 * 10^-21 J

But

ΔE =hc/λ

h = 6.6 *10^-34Js

c= 3 * 10^8 ms-1

λ= the unknown

λ= hc/ΔE

λ= 6.6 *10^-34 * 3 * 10^8/ 7.194 * 10^-21

λ= 2.75 * 10^-5 m

Answer:

focuses light on the retina

Explanation:

Answer: Chemical energy

Explanation: In this case plants convert light energy (1) into chemical energy, (in molecular bonds), through a process known as photosynthesis. Most of this energy is stored in compounds called carbohydrates. The plants convert a tiny amount of the light they receive into food energy.

Answer:

chemical energy

In this case plants convert light energy into chemical energy, (in molecular bonds), through a process known as photosynthesis. Most of this energy is stored in compounds called carbohydrates. The plants convert a tiny amount of the light they receive into food energy.

Explanation:

Answer:

a.Neon

b.carbon

c potassium

Answer:

1) No, 2) Yes, 3) Yes

Explanation:

Refer to solubility rules to understand if a precipitate occurs between a mix of solutions.

Two solutions form a precipitate if they react to yield an insoluble product.

Let us now consider each of the reacting species one after the other.

In the first case;

Zn(NO3)2(aq) + FeI2(aq) ----> ZnI2(aq) + Fe(NO3)2(aq)

The two products of the reaction are soluble so no precipitate is formed.

In the second case;

2KBr(aq) + Pb(NO3)2(aq) ------>  2KNO3(aq) + PbBr2(s)

An insoluble product PbBr2 is formed hence a precipitate is formed.

In the third case;

NH4Br(aq) + NaOH(aq) -------> NH4OH(aq) + NaBr(aq)

No insoluble product is formed so the there is no precipitate.

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Answer:

Large atoms hold their electrons very tightly. ... Large atoms tend to be found on the right side of their period on the periodic table.

Explanation:

Answer:

Explanation:

Large atoms tend to have a low ionization energy and a low electron affinity.

Answer:

A) the CH3 group

Explanation:

Answer:

2 AgCl + Mg(NO3)2 --> 2AgNO3 + MgCl2

Explanation:

This is balanced equation

Answer: A. Kinetic energy increases during exothermic changes and decreases during endothermic changes

Explanation: During an exothermic change potential energy is converted to kinetic energy. I hope this is correct. :)

Answer:

C

Explanation:

Answer:

The filter that water went through faster is Filter paper

Answer:

Diamond

Explanation:

Answer:

it is not naturally occuring

Answer:

[tex] \huge 3.986 \times { 10}^{ - 5} \: \: mol \\ [/tex]

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{24 \times {10}^{18} }{6.02 \times {10}^{23} } \\ \\ = 3.986 \times { 10}^{ - 5} \: \: mol[/tex]

Hope this helps you