Students in a science class prepared flash cards so that they could quiz one another about the
arrangement of the periodic table. One of the flash cards contained information about two
elements, Element L and Element M.

Qualities:
-Atom of element M has two more balances electrons than element atoms of L
- atoms of element L are more reactive than atoms of element M
-both elements are metals

The students had to use the information on n the flash cards to determine possible positions of the two elements on a blank periodic table. Which periodic table has the elements placed in the locations that match the information on the flash cards?

Answer:

The pressure of the gas would be 3.06 atm

Explanation:

Amonton's law states that the pressure is directly proportional to the absolute temperature of a gas under constant volume. The equation is:

P1 / T1 = P2 / T2

Where P1 is the initial pressure = 3.16atm

T1 is initial absolute temperature = 273.15 + 32.2°C = 305.35K

P2 is our incognite

And T2 is = 273.15 + 22.9°C = 296.05K

Replacing:

3.16atm / 305.35K = P2 / 296.05K

3.06 atm = P2

Answer:

Is C

Explanation:

Answer:

Yes, it is

Explanation:

Silicon (IV) oxide, commonly known as silica is a substance that majorly constitutes SAND. It has the chemical formula, SiO2, which contains a combination of silicon and oxygen.

The IUPAC name of SiO2 is Silicon IV oxide, which can also be referred to as Silicon dioxide because the structure the compound contains two (-di) oxygen atoms. Hence, based on the question, silicon(IV) oxide is the same as silicon dioxide.

Answer:

It is used to prevent rusting and corrosion on steel and iron. It is also used for batteries

Explanation:

It is used to prevent rusting and corrosion on steel and iron. It is also used for batteries

Answer:

subscript is a character

Explanation:

A subscript is a character (such as a number or letter) that is set slightly below or above the normal line of type, respectively. It is usually smaller than the rest of the text.

Answer:

c

Explanation:

37Ca and 53Fe have the same decay mode.

Three of the most common types of decay are alpha decay (α-decay), beta decay (β-decay), and gamma decay (γ-decay), all of which involve emitting one or more particles.

The most likely mode of decay for a neutron-rich nucleus is one that converts a neutron into a proton. Every neutron-rich radioactive isotope with an atomic number smaller than 83 decays by electron emission. C, 32P, and 35S, for example, are all neutron-rich nuclei that decay by the emission of an electron.

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Answer:

mole is equal to 1 moles Potassium Chloride, or 74.5513 grams.

Materials that are good conductors of thermal energy are called thermal conductors. Metals are especially good thermal conductors because they have freely moving electrons that can transfer thermal energy quickly and easily

Answer:

Explanation:

Materials that are good conductors of thermal energy are called thermal conductors. Metals are especially good thermal conductors because they have freely moving electrons that can transfer thermal energy quickly and easily.1

Answer:

the answer is d. 74.02

Explanation:

When ogyen all together with the different things to get this.

Answer:

ok

Explanation:

Answer:

18.368 Liters

Explanation:

Given that balanced Acetone oxidation,

= C3H6O + 4O2 = 3CO2 + 3H2O

lets assume volume of acetone = 1 liter

mass of acetone =  50 mg

number of moles present = (5*10^-3)g / ( 58.08 ) = 0.0000861 mol

Given that : I mol of ( acetone ) = 4 mol of oxygen

∴0.0000861 mol of acetone = 0.0003444 mol of oxygen

also note that the ratio of air to oxygen is

0.21 mol of oxygen  = 1 mol of air

∴ 0.0003444 mol of oxygen  =  0.00164 mol of air      (0.0003444 / 0.21 )

note : 1 mol at STP = 22.4 L     (at STP = Temperature = O°C

Finally the theoretically oxygen demand in liters of air for a 50 mg/L of acetone to decompose

Given that Acetone decompose/degrade completely between 500°C - 600°

we will take 500°  for the sake of this calculation

The oxygen demand in liters will be

=  22.4 * 0.00164 * 500 = 18.368 Liters

The theoretical oxygen demand in liters of air for a 50 mg / L acetone solution, to decompose completely is 18.368 Liters.

Moles of any substance will be calculated as:

n = W/M, where

W = given mass

M = molar mass

Given chemical reaction is:

CH₃COCH₃ + 4O₂ → 3CO₂ + 3H₂O

Given mass of acetone = 50mg = 0.05g

Moles of acetone = 0.05g / 58.08g/mol = 0.0000861 mole

From the stoichiometry of the reaction, it is clear that:

1 mole of CH₃COCH₃ = 4 moles of O₂

0.0000861 mole of CH₃COCH₃ = 4×0.0000861=0.0003444 moles of O₂

We know that ratio of air is:

0.21 mole of oxygen present = in 1 mole of air

0.0003444 mole of oxygen present = in 0.0003444/0.21=0.00164 mole of air

At STP 1 mole of gas is present in 22.4 Liter.

Degradation of acetone takes place in 500°C - 600°C.

Theoretical oxygen demand = 22.4×0.00164×500 = 18.368 Liters

Hence, theoretical oxygen demand is 18.368 Liters.

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Answer:

What is that supose to mean?

Answer:

I would never think that would be even a real question....what does it mean? what math problem is this?! I've never seen this in my life...does it mean... CCHHCHCH? *laughs nervously*

Explanation:

Have a Blessed Day.

salt is not because it gets u dehydrated

Answer:

El limon por su alto contenido en ácido cítrico, actúa como un excelente limpiador natural debido a su bajo pH y propiedades antibacterianas. A parte de todas estas propiedades, los limones huelen muy bien y es una rareza que pudiesen manchar o dañar algún material de la casa.

Explanation:

Answer:

It's the citric acid reacting to the iron oxide -which is basically the rust- it dissolves.

Explanation:

The rocks are classified as igneous, metamorphic, and sedimentary use the formation for classification purposes.

The outermost of them, called the crust, is composed of three types of rocks: magmatic, sedimentary and metamorphic. They are defined through the origin of several minerals and can be characterized with chemical composition, texture or shape, but the most used specification is based on composition.

The property does Valerie use for classification purposes is formation.

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Answer:

I think Sr I think so maybe

Answer:

kkajqjjqjqjnqnqnqjqjq

Answer:

I'm pretty sure it's only 5, because once you've used up all 5 marshmallows, you can't make any more s'mores. Unless just graham crackers and chocolate counts as a s'more...

:)

Answer:

4) C

6) true

I am not sure about 5th one

4) evaporation rate  

5) acetone

6) true

Answer: The compound formed between nitrogen (N) and nitrogen (N) a polar covalent bond because there is less than a 0.4 difference in electronegativity between the atoms.

Explanation:

If electronegativity difference between two atoms is less than 0.4 then bond formed is a pure covalent bond.

If electronegativity difference between two atoms is between 0.4 to 1.8 then bond formed is a polar covalent bond.

If electronegativity difference between two atoms is greater than 1.8 then bond formed is an ionic bond.

The electronegativity value of a nitrogen atom is 3.04. Hence, the electronegativity difference of [tex]N_{2}[/tex] molecule is as follows.

[tex]Electronegativity difference = electronegativity value of N - electronegativity value of N\\= 3.04 - 3.04\\= 0[/tex]As the electronegativity difference is 0 which is less than 0.4.

Hence, we can conclude that the compound formed between nitrogen (N) and nitrogen (N) a polar covalent bond because there is less than a 0.4 difference in electronegativity between the atoms.

Answer:

0.2 cm

Explanation:

looking at the ruler, you can see that the diameter is 0.4 cm. to get the radius, just divide by two, which gets 0.2 cm as the radius

Answer:

The answer is 7.7 ×10¹⁰

Explanation:

7.0 × 10³ × 1.1 × 10⁷

7.7 ×10¹⁰

Thus, The answer is 7.7 ×10¹⁰

-TheUnknownScientist

Answer:

7.17

Explanation:

convert 5.50g to moles of salicylic acid. Then use mole ratios and convert the moles of salicylic acid to moles of Asprin(mole ratio is 1:1). Then convert the moles to grams using the molar mass of asprin.

Answer:

V=d/t

,,,,,,,,,,,,,,,,,

Answer:0.87

Explanation:

Answer:

13.25 M

Explanation:

Molarity is moles over liters so simply plug your values in as such:

5.30 mol ÷ 0.400 L = 13.25 M

Answer:

Explanation:

A 12.48 g sample of an unknown metal, heated to 99.0 °C was then plunged into 50.0 mL of 25.0 °C water. The temperature of the water rose to 28.1 Go to calculating final temperature when mixing two samples of water ... Problem #1: A 610. g piece of copper tubing is heated to 95.3 °C and placed in an ... The two rings are heated to 65.4 °C and dropped into 12.4 mL of water at 22.3 °C. ... Problem #4: A 5.00 g sample of aluminum (specific heat capacity = 0.89 J g¯1