Gravity is an example of what

Answers

Answer 1

Answer:

Answer:Some examples of the force of gravity include;

-The force that holds the gases in the sun.

-he force that causes a ball you throw in the air to come down again.

-The force that causes a glass you drop to fall to the floor.

-The force that keeps the Earth and all of the planets in line in the proper position in their orbits around the sun.

-The force that causes an apple to fall downward from an apple tree.

-he force that keeps you walking on Earth instead of floating away into space.

Answer 2

Answer: May be force is the example of garvity ...

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A chemist has dissolved a certain substance in water the chemist knows that more of the substance could be dissolved into the water before it stops dissolving there for the current solution is a.) unsaturated b.) saturated c.) supersaturated
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Can the absolute energy states of the reactants (E1) and products (E2) be measured in a chemical reaction?

Based on reactivity, which of the following elements can replace iron (Fe) in a compound during a single replacement reaction?Al
Cu
F
Co

Answers

Answer: Option (a) is the correct answer.

Explanation:

Based on reactivity series, the reactivity of some metals in decreasing order is as follows.

Li, K, Ba, Ca, Mg, Al, Mn, Zn, Cr, Fe, Co, Ni

Thus, it can be seen that Al is more reactive than Fe, so it will replace iron in a single displacement reaction. Whereas cobalt is less reactive than iron hence, it will not replace Fe.

Fluorine being an anion will not replace a cation because in displacement reactions, only a cation can replace another cation and an anion can replace another anion.

Hence, we can conclude that Al will replace iron (Fe) in a compound during a single replacement reaction.

based on reactivity, the elements that can replace iron in a compound during a single replacement reaction would be :
Al

Because its higher than the other options in reactivity series

hope this helps

Which statement is true regarding the formation of ionic bonds?(a). Anions and cations share electrons.
(b). Atoms transfer electronsto form cations and anions.
(c). Ions transfer electrons to form cations and anions.
(d). Anions and cations donate electrons.

Answers

Answer: (b). Atoms transfer electrons to form cations and anions.

Explanation:

Covalent compounds are formed by sharing of electrons takes place between non metals.Ionic compounds are formed by transfer of electrons between metals and non metals.

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

Sodium atom has oxidation number of +1.

Electronic configuration of sodium:

$[Na]=1s^22s^22p^63s^1$

Sodium atom will loose one electron to gain noble gas configuration and form sodium cation with +1 charge.

$[Na^+]=1s^22s^22p^63s^0$

Chlorine atom has oxidation number of -1.

Electronic configuration of chlorine:

$[Cl]=1s^22s^22p^63s^23p^5$

Chlorine atom will gain one electron to gain noble gas configuration and form chloride ion with -1 charge.

$[Cl^-]=1s^22s^22p^63s^23p^6$

In sodium chloride the one electron from sodium metal gets transferred to chlorine atom and thus form an ionic bond.

Answer:

Atoms transfer electrons to form cations and anions.

Explanation:

Covalent compounds are formed by sharing of electrons takes place between non metals.Ionic compounds are formed by transfer of electrons between metals and non metals.

What weighs more? 1 mol of Gold, or 1 mol of Lead. A. You cannot determine the answer to this question from this information alone B. They both weigh the exact same amount C. 1 mol of Gold D. 1 mol of Lead

Answers

b, they both weigh the exact same. they’re both 1 mol

Final answer:

1 mol of Lead weighs more than 1 mol of Gold because lead has a higher atomic mass (207.2 g/mol) compared to gold's atomic mass (197.0 g/mol). Option D. is correct.

Explanation:

Consider the atomic masses of both gold and lead, as the question involves comparing a mole of each. Importantly, the molar mass of any substance is numerically equivalent to its atomic weight in Atomic Mass Units (amu). The atomic mass of gold is approximately 197.0 amu while lead has an atomic mass of around 207.2 amu.

Therefore, a 1 mol of Lead (207.2 g) would weigh more than 1 mol of Gold (197.0 g).

Learn more about Molar Mass here:

brainly.com/question/31327254

#SPJ11

How many moles of magnesium oxide are there in 2.50* 10^25 formula units of MgO?

Answers

just divide 2.50*10^25 by 6.02×10^23 to get to moles

When compared with the energy of an electron in the first shell of a carbon atom, the energy of an electron in the second shell of a carbon atom is(1) less(2) greater(3) the same

Answers

When compared with the energy of an electron in the first shell of a carbon atom, the energy of an electron in the second shell of a carbon atom is $\boxed{\left( {\text{2}} \right){\text{ greater}}}$ .

Further explanation:

Quantum numbers:

Quantum numbers govern the size, energy, shape, and orientation of an orbital. The four quantum numbers are as follows:

1. Principal Quantum Number (n): It denotes the principle electron shell. The values of n are positive integers (1, 2, 3,…).

2. Angular Momentum Quantum Number (l): It represents the shape of an orbital. The value of l is an integer from 0 to (n-1).

3. Magnetic Quantum Number $\left( {{m_l}} \right)$ : This quantum number represents the orientation of the orbital in space. The value of ${m_l}$ lies between –l to +l. The formula to calculate the value of ${m_l}$ is as follows:

${m_l} = - l,( - l + 1),.....,0,1,2,.....,(l - 1),l$

Therefore, the total number of ${m_l}$ values for a given value of l is 2l+1.

4. Electron Spin Quantum Number $({m_s})$ : It represents the direction of the electron spin. Its value can be $+ (1)/(2)$ or $- (1)/(2)$ .

The formula to calculate the energy of an electron in an atom is as follows:

${{\text{E}}_{\text{n}}} = \frac{{ - 13.6{{\text{Z}}^2}}}{{{{\text{n}}^{\text{2}}}}}{\text{eV}}$ …… (1)

Here,

E is the energy of an electron.

Z is the atomic number of atom.

n is the principal quantum number.

Calculation of energy of an electron in the first shell of carbon atom.

The value of Z is 6.

The value of n is 1.

Substitute these values in equation (1) to calculate the energy of electron in the first shell.

$\begin{aligned}{{\text{E}}_2}&=\frac{{ - 13.6{{\left( 6 \right)}^2}}}{{{{\left( 1 \right)}^{\text{2}}}}}{\text{eV}}\n&=\boxed{-489.6\;{\text{eV}}}\n\end{aligned}$

Calculation of energy of an electron in the second shell of carbon atom.

The value of Z is 6.

The value of n is 2.

Substitute these values in equation (1) to calculate the energy of an electron in the second shell.

$\begin{aligned}{{\text{E}}_1}&=\frac{{-13.6{{\left( 6 \right)}^2}}}{{{{\left( 2 \right)}^{\text{2}}}}}{\text{eV}\n&=\boxed{-122.{\text{4 eV}}}\n\end{aligned}$

The negative sign in the energy of the electron in both the shells indicates that the electron is bound to the nucleus of an atom. So the energy of electron in the second shell of carbon atom is greater than its energy in the first shell of carbon atom and therefore option (2) is correct.

Learn more:

1. Which transition is associated with the greatest energy change? brainly.com/question/1594022

2. Describe the spectrum of elemental hydrogen gas: brainly.com/question/6255073

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Atomic structure

Keywords: energy of electron, n^2, Z^2, -13.6, n, Z, -122.4 eV, -489.6 eV, 6, 1, 2, first shell, second shell.

The answer is (2) greater. The energy of an electron will increase when the number of valence shell increases. So the energy of an electron in the second shell of a carbon atom is greater than in the first shell.

#1: Which of the following is the abbreviation for a unit of energy? A. K / B. °C/ C. W / D. cal............... #2: A 200 g block of a substance requires 1.84 kJ of heat to raise its temperature from 25°C to 45°C. Use the table attached to identify the substance. A. iron/ B. aluminum/ C. gold/ D. copper.....................#3: In a calorimeter, the temperature of 100 g of water decreased by 10°C when 10 g of ice melted. How much heat was absorbed by the ice? A. 418 kJ / B. 100 kJ / C. 10 J / D. 4.18 kJ ..................#4: The amount of heat needed to raise the temperature of 50 g of a substance by 15°C is 1.83 kJ. What is the specific heat of the substance? A. 2.44 J/g-°C / B. 2.22 J/g-°C / C. 2.13 J/g-°C / D. 2.05 J/g-°C ................#5: In a calorimeter, 3.34 kJ of heat was absorbed when 10 g of ice melted. What is the enthalpy of fusion of the ice? A. 6.68 J/g / B. 334 J/g / C. 6.68 kJ/g/ D. 334 kJ/g

Answers

Among the choices, the unit of energy is calories. Answer in 1) is D. In 2) we are given with te mass , heat and temperature change. we just need to get the heat capacity and compare it with the following metals. The calculated heat capacity is 0.46 kJ/kg K. The answer is A. iron. In 3) we can compute the heat absorbed by the formula ΔH=mCpΔT. Cp of water is 4.18 J/g K. Answer of 3) is D. In 4) the formula used in Cp=ΔH/mΔT. Answer in 4) is A. The heat of enthalpy of fusion of ice is 80 cal/g. We convert this to J/g. Answer in 5) is B.334 J/g.

Answer:

1. D. cal......

2.A. iron

3. D

4.2.44j/g°C A

5,Lf=334J/g B

Explanation:

1: Which of the following is the abbreviation for a unit of energy? A. K / B. °C/ C. W / D. cal...............

calorie is the unit of energy

#2: A 200 g block of a substance requires 1.84 kJ of heat to raise its temperature from 25°C to 45°C. Use the table attached to identify the substance. A. iron/ B. aluminum/ C. gold/ D. copper.....................

Q=mcdt

1840=0.2*C*(45-25)

C=460J/KgK

if the specific heat capacity is the above then he substance is iron

#3: In a calorimeter, the temperature of 100 g of water decreased by 10°C when 10 g of ice melted. How much heat was absorbed by the ice? A. 418 kJ / B. 100 kJ / C. 10 J / D. 4.18 kJ .................

Q=mcdT

Q=0.1*10*4180

Q=4180j. answer D

.#4: The amount of heat needed to raise the temperature of 50 g of a substance by 15°C is 1.83 kJ. What is the specific heat of the substance? A. 2.44 J/g-°C / B. 2.22 J/g-°C / C. 2.13 J/g-°C / D. 2.05 J/g-°C ................

Q=mcdT

1830=50/1000*C*15

C=2440j/kg/k

change it to j/g°C

2.44j/g°C A

#5: In a calorimeter, 3.34 kJ of heat was absorbed when 10 g of ice melted. What is the enthalpy of fusion of the ice? A. 6.68 J/g / B. 334 J/g / C. 6.68 kJ/g/ D. 334 kJ/g

Q=mLf

Lf=enthalpy of fusion

3340/10=Lf

Lf=334J/g B

Enthalpy of fusion quantity of heat to convert 1 unit mass of a solid to liquid without any noticeable change in temperature.

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What is the total number of joules released when a 5.00-gram sample of water changes from liquid to solid at 0°C?(1) 334 J (3) 2260 J (2) 1670 J (4) 11 300 J

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