Advertisements for tobacco and alcohol products work because they "tell the truth."

True

False

Answer: The molecular formula will be [tex]C_3H_9[/tex]

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.  

The empirical formula is [tex]CH_3[/tex]

The empirical weight of [tex]CH_3[/tex] = 1(12)+3(1)= 15g.

The molecular weight = 45.0 g/mole

Now we have to calculate the molecular formula:

[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{45}{15}=3[/tex]

The molecular formula will be=[tex]3\times CH_3=C_3H_9[/tex]

Thus molecular formula will be [tex]C_3H_9[/tex]

Answer:

You solve that dividing beach term by -8 and simplifying which for this answers will give you r=-30

Explanation:

Pls correct me if I’m wrong.

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Ion knoe Wdym by “be able to describ’ so ima put it in my own words idr lol:)

if you talm bout some kentic energy or sum ok but other Dan dat ion knoe tbh

I can explain how transferring kinetic energy in and out of a substance can cause a change

1.Oort Cloud

2.Uranus Earth and Mars

3.Kuiper Belt

4.Asteroid Belt

Agricultural research careers would a student studying biotechnology most likely pursue. Therefore, option C is correct.

The United States Department of Agriculture's main internal research organization is the Agricultural Research Service. One of the four organizations in the USDA's mission area for research, education, and economics is ARS.

A wide definition of agricultural research is any research activity that aims to increase crop output and quality through genetic improvement, improved plant protection, irrigation, storage techniques, farm mechanization, effective marketing, and better resource management.

Agricultural research's main goals are to advance knowledge and advance technology. It deepens comprehension of the linkages and interconnectedness between farming communities and production systems.

Thus, option C is correct.

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Answer:

the solid is so hard

Explanation:

yan na po sana makatulong po heheheh

Metals such as Gallium and mercury are different from that of other metals like aluminium because they are liquid at room temperature. This is because of valence electrons which are relatively free in these metals.

All the metals except mercury and gallium are solids at room temperature. These metals are liquids because of both the high electrical conductivity and the thermal conductivity which come from the fact that one or more valence electrons is relatively free in these atoms to travel throughout the solid metal. This has been formalized in the Wiedemann-Franz law.

Both Gallium and mercury are unique elements (metals) which occur in the liquid state at near the room temperature. It is important here to note that mercury is essentially a liquid at room temperature while gallium becomes liquid at temperature near to room temperature. They both melt very easily due to the low melting temperature values.

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Answer:

when it reduces heat.

Explanation:

Thermal energy is transferred to material,the motion of its particles speeds up and it's temperature differences.Insulating materials are bad conductors and so this reduces the heat loss by conduction.The material also prevents air circulating inside the cavity,therefore reducing heat loss by convection.Heat loss through the roof can be reduced by laying loft insulation.

Answer:

binary and 11

Explanation:

CaCl2 or Calcium Chloride is an ionic bond and not a covalent bond. Since there should be sharing of electrons between two atoms to be a covalent bonding. In case of calcium chloride, the calcium gives up an electron to each chlorine atom, becoming Ca2+ ions and chlorine become Cl– ions.

:)

Answer:

True

Explanation:

Both work because an element would be pure and compounds can be split into elements. This will work unless the substance isnt chemcially pure, but in this case it is so the answer would be true.

Answer:

option b is correct

Explanation:

Metals are particularly good conductors of heat because their particles are very closely packed so the vibrations are passed on very quickly. They also contain large numbers of free electrons. These drift slowly through the structure, giving metals their strength and other properties. As the metal is heated, the free electrons closest to the heat source are heated. This makes them move faster and they travel through the metal, colliding with both atoms and other electrons. This naturally makes these vibrate faster (or move through the metal faster in the case of collisions with other free electrons). Thus, the heat is passed quickly through the metal.

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Answer:

H2SO4 + CaCO3 → CaSO4 + H2O + CO2 - Balanced equation | Chemical Equations online!

Na2co3 HCL nacl h2o co2

This is an acid-base reaction (neutralization): Na 2CO 3 is a base, HCl is an acid. This is a gas evolution reaction, CO 2 is the formed gas.

Answer:

I hope I can help you

I hope I can help you

Answer:

28atm

Explanation:

Using Gay lussac's law equation as follows:

P1/T1 = P2/T2

Where;

P1 = initial pressure (atm)

T1 = initial temperature (K)

P2 = final pressure (atm)

T2 = final temperature (K)

Based on the information provided in this question;

P1 = 30.0 atm, T1 = 30.0°C, P2 = ?, T2 = 10.0°C

NOTE: Absolute temperature i.e. Kelvin is required for this law

T1 = 30°C + 273K = 303K

T2 = 10°C + 273K = 283K

Using P1/T1 = P2/T2

30/303 = P2/283

Cross multiply

P2 × 303 = 30 × 283

303P2 = 8490

P2 = 8490/303

P2 = 28.02

New pressure of the gas = 28atm

Answer:

During the fractional distillation of crude oil: heated crude oil enters a tall fractionating column , which is hot at the bottom and gets cooler towards the top. vapours from the oil rise through the column. vapours condense when they become cool enough.

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The fractionating column's crystal clear glass beads provide such a vast surface area for heated vapors to cool and condensed continuously.

The fractionating column is inserted into the mouth of the distillation flask, which contains the saturated solution to be separated.

Heated crude oil is pumped into a tall fractionating column that is heated at the bottom and cools as it rises.

The oil fumes ascend through the column. When vapors cool down sufficiently, they condense. Various heights are used to lead liquids out of the columns.

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Answer:

B

Explanation:

And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This allows the water molecule to become attracted to many other different types of molecules.

Answer:

I believe it's B

Explanation:

Water can dissolve with any that's why it's universal and can dissolve substancrs more than any other Liquid.

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Answer:

Tomato worm  

Explanatio

v

vv

Answer

Tomato Worm

Explanation:

Explanation:

the answer will be 98.4 kJ

As per concept of enthalpy of fusion , 98,397 joules of energy  are required to freeze 10 g of water  at 0°C.

Enthalpy of fusion is defined as the enthalpy change which results from when  a substance changes its state from solid to  a liquid at a constant pressure.Heat of solidification is opposite of enthalpy of fusion.During fusion  there is a phase transition which takes place, from liquid to solid.

The temperature at which the fusion takes place is called as the fusion temperature. This enthalpy is accompanied without any change in temperature.

Enthalpy of fusion  of water=333.55 J/g  . This value is for 1 g of water as per definition,hence for 10 g water enthalpy of fusion is 10×333.55=3335.5 J.

Hence, 3335.5 joules are required for freezing 10 g sample.

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Answer:

m = 1 gram

Explanation:

Given that,

Heat, Q = 84 J

The temperature increases from 10°C to 30°C.

We need to find maximum number of grams of liquid water. We know that the heat required is given by :

[tex]Q=mc\Delta T[/tex]

c is specific heat of water, c = 4,200 J/kg°C

Use the above formula to find m. So,

[tex]m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{84}{4,200\times (30-10)}\\\\m=0.001\ kg[/tex]

or

m = 1 gram

So, the required mass is 1 gram.

Answer:82.7% C and 17.3% H

Explanation:

C4 = 12.0107g/mol x 4 = 48.0428 g/mol

H10 = 1.00794 g/mol x 10 = 10.0794 g/mol

Molar Mass of Butane, C4H10 =  48.0428 g/mol + 10.0794 g/mol= 58.1222 g/mol

percent composition of Carbon is  = ( mass of carbon contained in butane / molar mass of Butane) x 100

=(48.0428 /58.1222) x 100% = 0.8265 x 100

=82.65% =82.7% of Carbon.

Percent composition of Hydrogen  = (mass of Hydrogen contained in Butane / molar mass of Butane )x 100  

( 10.0794/58.122 ) x 100% =0.1734 x 100

= 17.3% OF Hydrogen.

Answer:

C- 82.7% C and 17.3% H

Explanation:

I took the Quiz

Answer:

the metal is gold I'd say

The mass of one metal atom is [tex]1.770\times 10^{-22}[/tex]grams.

The metal atom is palladium.

Explanation:

Given:

A face-centered unit cell.

The density of the unit cell is [tex]12020 kg/m^3[/tex].

The edge length of the unit cell 389.08 pm

To find:

The mass of one atom of the metal

Solution:

The density of the unit cell = d = [tex]12020 kg/m^3[/tex]

The edge length of the unit cell = a = 389.08 pm

[tex]1 pm = 10^{-12} m\\a=389.08 pm=389.08\times 10^{-12} m=3.8908\times 10^{-10}m[/tex]

Total number of atoms in F.C.C unit cell = z = 4

The atomic mass of the metal atom = M

The density of the unit cell is given by:

[tex]d=\frac{z\times M}{N_A\times a^3}\\12020 kg/m^3=\frac{4\times M}{6.022\times 10^{23}mol^{-1}\times (3.8908\times 10^{-10}m)^3}\\M=0.106586 kg/mol\\1 kg=1000 g\\M=0.106586 kg/mol=0.106586 \times 1000 g/mol\\M=106.586 g/mol[/tex]

The mass of one mole of metal atom = 106.586 g

The mass of 1 atom of metal :

[tex]=\frac{106.586 g}{6.022\times 10^{23}}\\=1.770\times 10^{-22} g[/tex]

The mass of one metal atom is [tex]1.770\times 10^{-22}[/tex] grams.

The atomic mass of the metal atom is 106.586 g/mol which is close to the atomic mass of the palladium. Hence, the metal atom is palladium.

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The first step of carbon cycle is animals are breaking down organic molecules and releasing carbon dioxide into the atmosphere.

Carbon cycle completes into four steps: photosynthesis, decomposition, respiration, and combustion.

In the first step, carbon enter the environment by respiration, and in the second step, carbon dioxide is consumed by plants.

Thus, the correct option is B.

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Answer:

3.26×10⁵ L

Explanation:

From the question given above, the following data were obtained:

Initial volume (V₁) = 3.5×10⁵ L

Initial temperature (T₁) = 27 °C

Initial pressure (P₁) = 101 KPa

Final temperature (T₂) = –10 °C

Final pressure (P₂) = 95 KPa

Final volume (V₂) =?

Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:

T(K) = T(ºC) + 273

Initial temperature (T₁) = 27 °C

Initial temperature (T₁) = 27 °C + 273

Initial temperature (T₁) = 300 K

Final temperature (T₂) = –10 °C

Final temperature (T₂) = –10 °C + 273

Final temperature (T₂) = 263 K

Finally, we shall determine the new volume of the tank. This can be obtained as follow:

Initial volume (V₁) = 3.5×10⁵ L

Initial temperature (T₁) = 300 K

Initial pressure (P₁) = 101 KPa

Final temperature (T₂) = 263 K

Final pressure (P₂) = 95 KPa

Final volume (V₂) =?

P₁V₁ / T₁ = P₂V₂ / T₂

101 × 3.5×10⁵ / 300 = 95 × V₂ / 263

117833.333 = 95 × V₂ / 263

Cross multiply

95 × V₂ = 117833.333 × 263

95 × V₂ = 30990166.6

Divide both side by 95

V₂ = 30990166.6 / 95

V₂ = 3.26×10⁵ L

Thus, the new volume of the tank is 3.26×10⁵ L

Na more reactive than Cu

Given

Copper in a solution of NaCl

Required

The displacement theory

Solution

A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds

Not all of these reactions can occur. We can use the activity series, which is a list of elements that can replace other elements below / to the right of them in a single replacement reaction.

The voltaic series:  

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe²⁺-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Fe³⁺-Ag-Pt-Au  

The electrode which is easier to reduce than the hydrogen (H2) electrode has a positive sign (E red= +) and is located to the right of the voltaic series (right of H)  

The electrode which is easier to oxidize than the hydrogen (H2) electrode and is difficult to experience reduction has a negative sign (E red= -) and is located to the left of the voltaic series (left of H)

Reaction

Cu + NaCl≠

The existing copper element can not replace the sodium element, which is on the left side so the reaction will not occur.

But if it is reversed, then a reaction can occur

2 Na + CuCl2 → Cu + 2 NaCl

Answer:

The fan blade would turn faster

Explanation:

Answer:

D. 1

Explanation:

Just took it :)

The element that would be found in Group 13 is

D. 1

The electron dot structure has three valence electrons.

Group-13 is also known as the Boron family. This group belongs to p-block elements. The elements of this group will have three electrons in their outermost shell i.e. 3 valence electrons.

Example: Boron has atomic number 5.

Electronic configuration of Boron: [tex]1s^2 2s^2 2p^1[/tex]

Thus, the electron dot structure for group-13 is option D i.e. 1.

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Answer:

I believe it would be C or B

Answer:

D. chemical energy

Explanation:

Food contains chemical energy as chemical energy is stored in bonds.

Answer:

The statements which are correct are;

c) (i), (ii) and (iv)

Explanation:

The chemical equation is presented as follows;

2Fe(s) + 3H₂O(g) → 3Fe₂O₃(s) + 3H₂(g)

Therefore, we have;

i) The iron gains oxygen atoms and therefore gets oxidized

The iron loses 3 electrons each to become oxidized to Fe³⁺ in Fe₂O₃

ii) The water loses oxygen and therefore it is getting reduced

iv) The water donates oxygen and therefore it is acting as the oxidizing agent

The correct options are (i), (ii) and (iv).