Explain the effects distance and mass have on the gravitational pull of the planets.

Answer: An example is sodium ethoxide (NaOCH2CH3) dissolved in ethanol (CH3CH2OH).

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Answer:

Row 2 = 4.07

Row 3 = 6.03

Explanation:

The prompt gives you the correct equation for calculating the average. For this question, it may make more sense to write the equation as follows:

Average Time = (Time Trial 1 + Time Trial 2 + Time Trial 3) / # of Trials

So, for a distance of 20 cm, the average time is...

Average Time = (4.11 + 4.03 + 4.06) / 3

                        = 12.2 / 3

                        = 4.07 s

For a distance of 30 cm, the average time is...

Average Time = (6.07 + 5.99 + 6.03) / 3

                        = 18.09 / 3

                        = 6.03 s

Answer:

137 g

Explanation:

Since1 L=103  mLyou can say that your sample must contain 550.0mL solution⋅1.50 moles KI103mL solution=0.825 moles KITo convert the number of moles of potassium iodide to grams, use the molar mass of the compound.0.825moles KI⋅166.003 g1mole KI=137 g−−−−−

Answer:

5l NO

2

at STP

No. of molecules=

22.4

5

mol=

22.4

5

×N

A

molecules

A) 5ℊ of H

2

(g)

No. of moles=

2

5

mol=

2

5

×N

A

molecules

B) 5l of CH

4

(g)

No. of moles of CH

4

=

22.4

5

mol=

22.4

5

N

A

molecules

C) 5 mol of O

2

=5N

A

O

2

molecules

D) 5×10

23

molecules of CO

2

(g)

Molecules of 5l NO

2

(g) at STP=5l of CH

4

(g) molecules at STP

Therefore, option B is correct.

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The VSEPR (Valence Shell Electron Pair Repulsion) theory describes the arrangement of electron pairs around a central atom in a molecule, and the VSEPR number represents the total number of electron pairs around the central atom, including both bonding pairs and lone pairs.The VSEPR number can be determined from the Lewis structure of the molecule, which shows the arrangement of atoms and lone pairs around the central atom. The first two digits of the VSEPR number correspond to the number of bonding pairs and lone pairs, respectively, around the central atom.To determine the third digit of the VSEPR number, you need to consider the shape of the molecule. The shape is determined by the repulsion between electron pairs, which is strongest between lone pairs and decreases in the order lone pair-lone pair > lone pair-bonding pair > bonding pair-bonding pair.The third digit of the VSEPR number indicates the shape of the molecule according to the following scheme:1: linear shape2: trigonal planar shape3: tetrahedral shape4: trigonal bipyramidal shape5: octahedral shapeThus, to determine the third digit of the VSEPR number, you need to determine the shape of the molecule based on the number of electron pairs and their relative positions. This can be done by applying the VSEPR theory and considering the repulsion between electron pairs. Alternatively, you can consult a table or chart that lists the shapes associated with different VSEPR numbers.

Considering the definition of percent by mass, the correct answer is the third option: the correct formula to calculate percent by mass is [Mass of solute (g) ÷ mass of solution (g)] × 100

The percent by mass is a measure of the amount of mass that an element occupies in a compound and it is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

To calculate the percentage of composition, it is necessary to know the mass of the element in a known mass of the compound.

So, the percent by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage:

percent by mass= [Mass of solute (g) ÷ mass of solution (g)] × 100

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Answer:

Explanation:

1 . The strongest force observed at the surface of glass is:__DIPOLE______

2. . Water is__POLAR_________ and interacts, generating adhesive interactions with the only weak dispersion strong hydrogen bonding polar glass.

3 . Hexane is_NON-POLAR _______ and interacts, generating__ONLY WEAK __________ adhesive interactions with the glass.

Answer:

C.

Explanation:

Answer:

boron has an atomic mass of 10.810 amu consists of two isotopes.

Answer:

boron has an atomic mass of 10.810 amu consists of two isotopes.

Explanation:

Answer:

The chemical equation for the decomposition of mercury(II) oxide is:

2HgO(s) → 2Hg(l) + O2(g)

This means that when solid mercury(II) oxide (HgO) is heated, it breaks down into liquid mercury (Hg) and gaseous oxygen (O2). The reaction is a decomposition reaction because one reactant (HgO) is broken down into two products (Hg and O2). This reaction is also exothermic, meaning that it releases heat.

Explanation:

The heat capacity for the metals are;

Aluminum -  0.89

Copper - 0.11

Iron - 0.44

Lead - 0.12

The specific heat of a substance is denoted by the symbol "C" and is typically measured in units of J/g·°C (joules per gram per degree Celsius) or cal/g·°C (calories per gram per degree Celsius).

The specific h

We have that;

For Aluminum;

c = 4.184 * 39.85 * 4.7/11.98 * 72.9

= 783.6/873.3

= 0.89

For Copper;

c =  4.184 * 12.14 * 1.9/12.14 * 75.4

= 96.5/915.3

= 0.11

For Iron

c =  4.184 * 40.24 * 2.4/12.31 * 75.1

= 404.1/924.5

= 0.44

For Lead

c = 4.184 * 39.65 * 0.7/12.46 * 76.7

c = 116.1/955.68

= 0.12

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The final temperature of the mixture given that 25 g of water at 25 °C is mixed with 25 g of water at 65 °C, is 45 °C

The final temperature of the mixture can be obtained by calculating the equilibrium temperature of the mixture. This is shown below:

Heat loss by warm water = Heat gain by cold water

MᵥᵥC(Tᵥᵥ - Tₑ) = MC(Tₑ - T)

Cancel out C

Mᵥᵥ(Tᵥᵥ - Tₑ) = M(Tₑ - T)

25× (65 - Tₑ) = 25 × (Tₑ - 25)

Cancel out 25

65 - Tₑ = Tₑ - 25

Collect like terms

65 + 25 = Tₑ + Tₑ

90 = 2Tₑ

Divide both side by 2

Tₑ = 90 / 2

Tₑ = 45 °C

Thus, we can conclude that the final temperature the mixture is 45 °C

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Answer:

strontium nitrate

Explanation:

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The complete reaction for potassium hydroxide (KOH) and phosphoric acid (H3PO4) would yield products of water (H2O) and potassium phosphate (K3PO4).

3 KOH + H3PO4 ---> K3PO4 + 3 H2O

The net ionic equation would be obtained when you express the compounds in their ionic forms and eliminating the spectator ions. Spectator ions are the ions that appear in the reactant and product side. They do not actively participate the in the reaction.

3 K+ + 3 OH- + H3PO4  --->  3K+ + PO4^3- + 3 H2O

H3PO4 is a weak acid so it does not dissociate. H2O is not an ionic compound so it also does not dissociate. Therefore, the spectator ion is the potassium ion K+. The net ionic reaction is

3 OH- + 3 H3PO4  ---> PO4^3- + 3 H2O

Answer:

0.31 Joule

Explanation:

ΔE(per photon) = h·f = (6.63 x 10⁻³⁴J·s)(6.69 x 10¹⁴s⁻¹) = 4.44 x 10⁻¹⁹ J/photon X 7 x 10¹⁷photons = 0.31 Joules

Explanation:

Since 10mm is 1cm

Therefore 7.60cm is 760mm

Since 1 inch is 2.54cm

Therefore 7.60cm is 3.10 inches

Answer:

Oil is the most viscous liquid.

The volume of carbon dioxide produced is approximately (d) 11.9 liters.

To determine the amount of carbon dioxide (C\(O_2\)) produced when 37.8 grams of carbon disulfide (C\(S_2\)) reacts with excess oxygen gas (\(O_2\)), we need to use stoichiometry and the given balanced chemical equation:

C\(S_2\)(l) + 3\(O_2\)(g) → C\(O_2\)(g) + 2S\(O_2\)(g)

First, we calculate the number of moles of C\(S_2\) using its molar mass:

Molar mass of (C\(S_2\)) = 12.01 g/mol (C) + 32.07 g/mol (S) × 2 = 76.14 g/mol

Number of moles of (C\(S_2\)) = mass / molar mass = 37.8 g / 76.14 g/mol ≈ 0.496 mol

From the balanced equation, we can see that the stoichiometric ratio between (C\(S_2\)) and C\(O_2\) is 1:1. Therefore, the number of moles of C\(O_2\) produced will also be 0.496 mol.

Now we can use the ideal gas law to calculate the volume of C\(O_2\) at the given temperature and pressure. The ideal gas law equation is:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin.

Converting the temperature from Celsius to Kelvin:

T(K) = 28.85°C + 273.15 = 302 K

Using the ideal gas law:

V = nRT / P = (0.496 mol) × (0.0821 L·atm/mol·K) × (302 K) / (1.02 atm) ≈ 11.9 L

The correct answer is 11.9 liters.

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The arrangement of hydrogen bonds during freezing is what causes water to have a lower density when it solidifies: the water molecules are pushed together.

Why is density important?

The density of a place refers to the quantity of things—which may include people, animals, animals, or objects—there are in it. Multiply the number of items even by area's measurement to determine density. A country's population density is calculated by dividing its total population by its area, expressed in square kilometers or miles.

What is a density unit?

However, kg/m3 is used as the standard SI unit for density. As seen below (t/m3-metric ton per cubic meter), density can be expressed in units of liters or metric tons. It stands for grams per milliliter. kilograms per liter, or kg/L.

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Answer:

266Lr

Thirteen isotopes of lawrencium are currently known; the most stable is 266Lr with a half-life of 11 hours, but the shorter-lived 260Lr (half-life 2.7 minutes) is most commonly used in chemistry because it can be produced on a larger scale.

Explanation:

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The grams of iburofen does such a tablet contain 800 mg =   0.8g Ibuprofen

1 g = 10^-3g = .001g

Ibuprofen has  800 mg doses in over-the-counter analgesic

800g = 800 × .001

        = 0.8g

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Answer: a) 85% of the reactants were used up

b) True

Explanation:

Percentage yield is defined as the ratio of actual yield to theoretical yield in terms of percentage. The actual yield is the amount of product obtained after the experiment and the theoretical yield is the amount of ideal product that should have been obtained.  

Formula :  

\(\text {percentage Yield}=\frac{\text {Actual Yield}}{\text {Theoretical Yield}}\times 100\)

Thus 85 % yield means 85 % of the reactants were used up to give only 85% of products.

The limiting reactant is the reactant that limits the amount of product formed and hence is completely used up after the reaction is complete. Thus the given statement is True.

​104895.10 kilometers need to drive for the lower fuel consumption of the second car to compensate for the higher cost of this car.

For calculating the number of  miles  we need the compare the cost equation of both cars.

Considering x be the number of kilometers, since the mileage of the USA-made car is (22.5 * 1.609) / 3.785 = 19.56-kilo meter per litre, and the cost of petrol  per Litres = 2.05 .

SO for the USA made the pertrol cost is 2.05 / 9.56 = $0.214per km

and for the european made car is  2.05 / 28.5 = $0.071 per km

since the total cost is nothing like the sum of the purchase price and the fuel cost SO,  

for the  USA  made , the total  cost  is  = 85,000  + 0.214x and

for the  eurpoean car is   = 100,000 + 0.071x

By comparing the equation by considering the total cost for a car  to be equal so

85,000  + 0.214x =100,000 + 0.071x

=>100,000- 85,000 = 0.214x- 0.071x

=>15000= 0.143x

=>x=  104895.10

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​

First group metals forms 1:1 compounds with 17th group or group 7 A. Thus, the statement is true. Aluminum forms its oxides by 2 Al and 3 oxygen atoms. Hence, the statement is false.

Ionic bonds are formed between metals and non metals. Metals are electron rich and easily loss one or more electrons to electron deficient nonmetals.

First group elements are called alkali metals. They have one valance electron. Group 7A are halogens  with 7 valence electrons. They need one more electron to achieve octet.

Thus, alkali metals donate their valence electron to halogens and forms 1:1 compound. Therefore, the statement is true.

Aluminum reacts with oxygen to form its oxide Al₂O₃. Thus, 2 Al and 3 Os are  combined to form covalent bond. Thus, the statement is false.

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Answer:

Each donor gave away more than one organ.​

Explanation:

edge 2021

Answer: D

Explanation:

A) The chemical symbol for the ion is Fe+

B) It has 20 electrons in total, and there are 6 3p electrons in the ion.

C) There are 6 electrons present in the 3p orbital.

The atomic cation with the given electron configuration is represented by the chemical symbol Fe+.

To determine the number of electrons in the ion, we need to count the electrons present in the electron configuration. In the given configuration, we can see that the 1s orbital has 2 electrons, the 2s orbital has 2 electrons, the 2p orbital has 6 electrons, the 3s orbital has 2 electrons, the 3p orbital has 6 electrons, the 3d orbital has 1 electron, and the 4s orbital has 1 electron. Adding up these numbers, we have:

2 + 2 + 6 + 2 + 6 + 1 + 1 = 20

Therefore, the ion has 20 electrons.

To determine the number of 3p electrons in the ion, we look at the 3p orbital. In this case, there are 6 electrons present in the 3p orbital.

In summary, the chemical symbol for the ion is Fe+, it has 20 electrons in total, and there are 6 3p electrons in the ion.

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The balanced chemical equation is the representation of the elements with the same proportion of elements on both sides. The balanced equation is, 2CH₃(CH₂)₄CH₃ + 19O₂ → 12CO₂ + 14H₂O.

An equation is said to be balanced if the number of atoms of the element on the right side is the same as that of the left side of the reaction.

CH₃(CH₂)₄ CH₃(g) + O₂(g) → CO₂(g) + H₂O(g)

Here the number of carbon, hydrogen, and oxygen are unbalanced.

Coefficients are added before carbon, oxygen, and a hydrogen atom. First, 2 is added before the carbon on the reactant side and 12 at the carbon of the product side.

After this, the number of hydrogen is balanced by adding 14 on the product side followed by adding 19 on the oxygen of the reactant side.

The balanced equation: 2CH₃(CH₂)₄CH₃ + 19O₂ → 12CO₂ + 14H₂O

Therefore, 2CH₃(CH₂)₄CH₃ + 19O₂ → 12CO₂ + 14H₂O is the balanced equation.

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