Based on the Lewis/electron dot representation
of the two atoms, predict the ratio of metal
cationic (+) atom to nonmetal anionic (-) atom in the compound

Answer: A hypothesis is an explanation for observations. A theory is an explanation for what has been shown many times.

Explanation:

Answer:

3C + 2Fe ₂ O ₃ → 3CO ₂ + 4Fe

Explanation:

C + Fe ₂ O ₃ → CO ₂ + Fe

Left Side

C = 1

Fe = 2

O = 3

Right Side

C = 1

Fe = 1

O = 2

So we can see that while Carbon is balanced Fe and O are not.

We then attempt to balance the equation by balancing the Oxygen.

C + 2Fe ₂ O ₃ → 3CO ₂ + Fe

Left Side

C = 1

Fe = 4

O = 6

Right Side

C = 3

Fe = 1

O = 6

Oxygen is now balanced but C and Fe are not, though this is an easy fix as each are independent on each side of the equation.

3C + 2Fe ₂ O ₃ → 3CO ₂ + 4Fe

Left Side

C = 3

Fe = 4

O = 6

Right Side

C = 3

Fe = 4

O = 6

Answer:

2 , 3 , 4 , 3

Explanation:

Answer:

1.66 * 10^-18 mol of Argon

Explanation:

Avogadro says 1 mol of anything has 6.022* 10^23 atoms/particles. Thus using this principle, 1 million argon atoms will have

[tex]1,000,000 atoms Argon * \frac{1mol Argon}{6.022*10^{23} atoms }[/tex]

[tex]1.66*10^{-18} mol \\\\ of Argon[/tex]

One million argon atoms is equivalent to 1.7 × 10⁻¹⁸ moles of argon atoms.

To convert one million (10⁶) argon atoms to moles of argon atoms, we will use Avogadro's number: there are 6.02 × 10²³ argon atoms in 1 mole of argon atoms.

[tex]10^{6} atom \times \frac{1 mol}{6.02 \times 10^{23}atom } = 1.7 \times 10^{-18} mol[/tex]

One million argon atoms is equivalent to 1.7 × 10⁻¹⁸ moles of argon atoms.

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Answer:

Reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.RT

Explanation:

Answer:

The answer is 2C8H18 + 25O2 → 16CO2 + 18H2O .

(Correct me if I am wrong)

Answer:

Compared to early humans our brains seemed to have increased in size, and part of the cause may be because of things like Climage change, ecology and social competition

Explanation:

Answer:

7.0

Explanation:

second question is 4.90 third question is 3.0 fourth question is 6.6

Answer:

The first answer is 4.6 cm + 2.35 cm =  7.0  cm

The second answer is 8.45 cm – 3.55 cm =  4.90  cm

The third answer is 1.2 cm × 2.54 cm = 3.0  cm^2

Then the last answer is 6.6 cm^3 ÷ 1.00 cm^2 =  6.6  cm

I hope this helps, Its correct on edge 2020 :)

Answer:

C. Billions

Explanation:

or even more

Answer:

Option A. 6.75 (6.20/85.6)

Explanation:

The following data were obtained from the question:

Initial volume (V1) = 6.2cm³

Initial concentration (C1) = 6.75M

Final volume (V2) = 85.6cm³

Final concentration (C2) =.?

The final concentration can be obtained by using the dilution formula as show below:

C1V1 = C2V2

6.75 x 6.2 = C2 x 85.6

Divide both side by 85.6

C2 = (6.75 x 6.2) /85.6

C2 = 6.75 (6.2 / 85.6).

1. neutral

2.strong base

3.weak acid

4.strong acid

5.weak base

Answer:

1.6

Explanation:

log 43 = 1.6335

B, 1.6

Explanation: E21

Answer:

The answer to your question is given below

Explanation:

1. When two hydrogen atoms pair together, they form a single bond to achieve complete duet.

Hydrogen atom has 1 shell and 1 valence electron and they contribute it to form bond, thereby obtaining a stable duet configuration

H + H —> H–H —> H2

2. When two halogen atom pair together, they form a single bond to achieve a complete octet which is stable. For example, Cl has 7 electrons in its outermost shell and need 1 more electron to complete it octet. Each Cl will contribute 1 electron each to form a single bond..

Cl + Cl —> Cl–Cl —>Cl2

3. When two oxygen atoms pair together, they form double bond to achieve a complete octet which is a stable configuration.

Oxygen has 6 electrons in its outermost shell and needs 2 more electrons to complete its octet configuration. Each oxygen atom will contribute 2 electrons each to form a double in order to complete it octet configuration.

O + O —> O=O —>O2

4. When two nitrogen atom pair together, they form a triple bond to achieve a complete octet which is stable. Nitrogen has 5 electrons in its outermost shell and needs 3 more electrons to complete it octet configuration. Each nitrogen atom will contribute 3 electrons each to form a triple bond in order to complete its octet configuration.

N + N —> N≡N —> N2.

The explanation as to why each of the elements occurs as diatomic molecules is as follows;

Hydrogen atom has only the 1 shell and 1 valence electron and an Hydrogen molecule is formed when the duet is achieved.

When two halogen like Chlorine, Cl (each with a valency of 7) atoms yields a single bond to achieve a complete octet which is stable. Each Cl will contribute 1 electron each to form a single bond..

Upon bonding of two oxygen atoms, a double bond is formed to achieve a complete octet which is a stable configuration.

Oxygen has a valency of 6 and needs 2 more electrons to complete its octet configuration. Each oxygen atom will contribute 2 electrons each to form a double in order to complete it octet configuration.

When two nitrogen atom pair together, they form a triple bond to achieve a complete octet which is stable.

Nitrogen has a valency of 5 and needs 3 more electrons to assume an octet configuration. Each nitrogen atom will contribute 3 electrons each to form a triple bond in order to complete its octet configuration.

Read more;

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Answer:

Rubidium 265 pm

Explanation:

As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period

Hydrogen 53 pm

Lithium 167 pm

Sodium 190 pm

Answer:

36 hours

Explanation:

Notice that you are given the actual table of how the isotope reduces , and it shows that for each period of 6 hours the isotope decays to half of the initial number.

EVery 6 hours, the reduction in number of mg of the isotope goes down in half'

100 mg, then 50 mg, then 25 mg, then 12.5 mg, then 6.25 mg, then 3.125 mg and finally (reaching 1.5625 mg

That was 6 periods of 6 hours each, which totals: 6 time 6 hours = 36 hours

Answer:

5.7 M

Explanation:

You have .390 L of 4.6 M HCl.

.390 L * 4.6 mol/L = 1.794 mol HCl

.390-.074=.316 L solvent remaining

1.794 mol/.316 L=5.7 M HCl

Answer: A. Electrons are knocked off atoms, causing electricity to flow.

Explanation:

Photoelectric effect is defined as emission or ejection of electrons from the surface of a metal when a light of certain frequency falls on the surface of the metal. Electrons emitted in this effect can be called photoelectrons.

The light which falls on the surface of the metal must be of sufficiently high frequency called as threshold frequency.

Thus light knocks off the electrons and thus the flow of electrons will result in the production of electricity.

Thus the correct option is Electrons are knocked off atoms, causing electricity to flow.

Answer:

If the reaction is going from left to right it would be synthesis, if going right to left it would be decomposition.

Explanation:

Na2O (s) + 2CO2 (g) + H2O (g) = 2 NaHCO3 (s)

Left Side

Na = 2

O = 6

C = 2

H = 2

Right Side

Na = 2

O = 6

C = 2

H = 2

Ok so is balanced already, though initial equation in question had an error in regards to the left hand side the ) should have been an O.

Hmm

Na2O (s) + 2CO2 (g) + H2O (g) = 2 NaHCO3 (s)

If it was going from right to left would be decomposition

But going from left to right it would be synthesis

Answer:

           1s², 2s², 2p³  

Explanation:

The atomic number of Nitrogen is seven. So it contains seven protons and seven electrons in neutral form. Also, the electronic configuration cited above contains seven electrons among which two electrons are present in first shell and five electrons are present in valence shell respectively.

Answer:

Solid Zn

Explanation:

I took the test :-)

In the diagram solid Zn is negatively charged.

Zinc is known as a element that acts as a negative electrode based on the fact that it has more negative potential and acts as the anode.

Based on the fact that zinc is a metal, it is known to often forms metallic compounds with other kinds of metals and based on the fact that it also has an ion charge of +2, the zinc ions are referred to as a strong reducing agents and thus do form ionic bonds.

Learn more about negative charge from

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Answer:

2KOH(aq) + H2SO4(aq) → K2SO4(aq) + 2H2O(l)

Explanation:

A neutralization reaction refers to any reaction between an acid and a base to form salt and water only. In a neutralization reaction, the key reaction that takes place to produce water is shown ionically below;

H^+(aq) +OH^-(aq) ----> H2O(l)

Looking at all the options provided, our gaze will have to settle on the reaction;

2KOH(aq) + H2SO4(aq) → K2SO4(aq) + 2H2O(l)

We can clearly see that there is an acid that reacts with a base to form a salt and water. The base contains the OH^- ion while the acid contains the hydrogen ion.

This is the only reaction of this sort among the options hence it is the correct answer.

Answer:

C. Atoms and molecules are always in motion.

Answer:

So the empirical formula is C14H18N2O5

Explanation:

C = 57.2% = 12g/mol

H = 6.1% = 1g/mol

N = 9.5% = 14g/mol

O = 27.2% = 16g/mol

Empirical Formula for compound hmm

Assume

C = 57.2g

H = 6.1g

N = 9.5g

O = 27.2g

So we have

C = 57.2g/12g =  4.76  moles

H = 6.1g/1g      =  6.10   moles

N = 9.5g/14g   =  0.68  moles

O = 27.2g/16g =  1.70   moles

Divide each mole value by the smallest number of moles calculated.  Round to the nearest whole number.

C =  4.76  moles / 0.68 moles = 7

H = 6.10   moles / 0.68 moles = 9

N = 0.68  moles / 0.68 moles = 1

O = 1.70   moles / 0.68 moles = 2.5

Ok so we now have the ratios but for O it's 2.5, have to be whole numbers so we will need to double all the numbers.

C = 14

H = 18

N =  2

O =  5

So the empirical formula is C14H18N2O5

Answer:

The atom with one outer most electron is sodium

The atom with two outermost electrons is magnesium

The atom with five outermost electrons is phosphorus

Explanation:

A dot structure of an atom shows the number of electrons present on the outermost shell of that atom. In order words, a dot structure shows the valence electrons present on the valence shell of an atom.

Sodium has an atomic number of 11, hence the electrons are arranged in three shells in the following order 2,8,1. This implies that one electron is present on it's outermost shell.

Magnesium has an atomic number of 12. Its electrons are arranged in shells in the order; 2,8,2. Hence, two electrons are present in its outermost shell.

Phosphorus contains 15 electrons(atomic number of 15), these electrons are arranged in shells in the order 2,8,5. Hence there are five outermost electrons present in phosphorus.

Answer:

1 dot sodium

2 dots Magnesium

7 dot Fluorine

5 dot Phosphorus

Explanation:

Answer:

Explanation:

Skeleton equations are also known as unbalanced equations.

Eg I react Oxygen, Hydrogen and Chlorine and I get Water and Chlorine Gas

H2 + Cl2 = HCl

Left Side

H = 2

Cl = 2

Right Side

H = 1

Cl = 1

As you can see it's not balanced is skeleton equation.

Answer:

cold temperatures slow the rate at which the cells die.

Explanation:

the answer is c

The correct answer is option C. Cold temperatures slow the rate at which cells die.

Temperatures between 46 ° C and 60 ° C are associated with irreversible cell damage proportional to exposure time (8, 9). Protein coagulation occurs quickly between 60 ° C and 100 ° C, causing irreversible damage to important cytosol and mitochondrial enzyme-nucleic acid-histone complexes.

Cold temperatures can also slow down cell growth by preventing cell hypertrophy. In extreme situations,  Prolonged exposure to freezing temperatures can cause intracellular fluids to begin to freeze, forming crystals that penetrate the membrane and eventually kill the cells.

Perhaps by reducing elasticity and preventing the uptake of lipid substances into the expanding membrane. Tissue swelling at low temperatures causes lesions in the cell membrane and can cause cold wounds.

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=molar mass( CaS )

= 40.08+32.07

=72.15 g mol-1

Answer:

72.143 g/mol

Explanation: