A single atom with a unique number of protons

Answer:

b) 2.0 mol

Explanation:

Given data:

Number of moles of Ca needed = ?

Number of moles of water present = 4.0 mol

Solution:

Chemical equation:

Ca + 2H₂O     →      Ca(OH)₂ + H₂

now we will compare the moles of Ca and H₂O .

                          H₂O        :        Ca                

                             2           :        1

                             4.0           :       1/2×4.0 = 2.0 mol

Thus, 2 moles of Ca are needed.      

The question is incomplete, the complete question is;

Assign an oxidation number to each element in the reaction.

CO(g) + 2H2(g) → CH3OH(g)

In CO, the oxidation number of C is _, and that of O is _.

In H2, the oxidation number of H is _.

In CH3OH, the oxidation number of C is _, that of O is _, and that of H is _.

Answer:

See explanation

Explanation:

If we look at the reaction, in CO, C is +2 while O is -2. Remember  that the sum of all the oxidation numbers in a compound must be zero.

The oxidation number of atoms in a diatomic molecule is zero hence in H2, H is zero.

We already know the oxidation states of oxygen and hydrogen in CH3OH to be -2 and +1 respectively. Carbon is;

x + 4(1) + (-2) = 0

x + 2 =0

x = -2

Hence in CH3OH, carbon has an oxidation state of -2.

Answer: [tex]TiO_2[/tex] has higher percentage of oxygen by mass.

Explanation:

To calculate the mass percent of element in a given compound, we use the formula:

[tex]\text{Mass percent of oxygen}=\frac{\text{Mass of oxygen}}{\text{mass of compound}}\times 100[/tex]

1. Mass of oxygen in [tex]TiO_2[/tex] = [tex]\frac{32g}{80g}\times 100=40\%[/tex]

2. Mass of oxygen in [tex]ZnO[/tex] = [tex]\frac{16g}{81g}\times 100=19.8\%[/tex]

Thus [tex]TiO_2[/tex] has higher percentage of oxygen by mass.

The compound with the higher percentage of oxygen by mass is titanium dioxide.

Titanium dioxide, TiO2, has a molar mass of 79.866 g/mol and O2 has a molar mass of 32.

Percentage by weight of oxygen in TiO2 = 32/79.866 x 100

                                                          = 40.07%

Zinc oxide, ZnO, has a molar mass of 81.38 g/mol

percentage by weight of oxygen in ZnO = 16/81.38 x 100

                                                               = 19.66%

Thus, titanium dioxide has a higher percentage by weight of oxygen than zinc oxide.

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Answer:

Option C 28 Proton 31 neutron 26 elecrtons

Explanation:

Answer:

jdkskdkakalalalalalakandnxkdmymy

Writing each number in full form, we have;

We know that scientific notation affords us the opportunity to write numbers in a  manner that is shorter and saves space by the use of exponents.

We shall now try to write each number in the full form;

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Answer:

Compound 1: Carbon Dioxide (CO_2)

Compound 2: Water (H_2 O)

Compound 3: Potassium Nitrate (KNO_3)

Compound 4: I am unsure

Compound 5: Calcium Sulfate

Explanation:

Answer:

1. Periodic Table

2. Periods

3. Groups

4. Metals

5. Non - Metals

6. Metalloids

7. Alkaline Metals

8. Transition Metals

Explanation:

i hope this was right. Tell me if it was wrong.

Answer:

1. Periodic table

2. Periods

3. Groups

4. Metals

5. Nonmetals

6. Metalloids

7. Representative elements

8. Transitition metals

Explanation:

Note for the 7th blank: it's either representative elements or main group elements. I'm not sure what terminology is on your vocab list, so keep that in mind. Good luck on your final!

Answer:

c, maybe d, and I think b.

Explanation:

Im sorry if wrong

Answer:

CuSO4 + 2NH4OH -----> Cu(OH)2 + (NH4)2SO4

Explanation:

Answer:

Sn(C2H3O2)2

Explanation:

C2H3O2 is Acetate

Sn is tin

Acetate has a -1 charge

In order for tin to have a +2 charge, we need two acetates

So we write it as (C2H3O2)2

You just leave Sn blank because of the roman numeral and since it is a transition metal.

So the answer is Sn(C2H3O2)2

Answer:

[tex]\boxed {\boxed {\sf Sn (C_2 H_3 O_2)_2}}[/tex]

Explanation:

First, find what tin and acetate is.

Next, find the charge on acetate, which is -1.

The Roman Numeral 2 in parentheses after tin (II), signifies that the tin has a charge of +2.

We need to balance the charges, so they will equal 0.

The best way to balance is by using 2 acetate molecules

If we want 2 acetate molecules, we must add a subscript of 2 after acetate.

Add the tin (Sn) in front

The formula for tin (II) acetate is Sn (C₂H₃O₂)₂

Answer:

The pressure should be 21 atm. You can change units if needed

Explanation:

use the forumla PV=nRT. To figure out pressure you need to divide by the volume on each side. the put the apporite units into the formula and Bam. u got it

Answer:

25 atm or 190mmHg

Explanation:

Since Temperature is constant we dont need to worry about it so.

P1V1=P2V2

Rewritten as (P1xV1)/V2 Always use liters in gas laws

I Prefer atm so ill convert to that to use in the equation.

(.5atmx.4L)/.8L =.25 atm or 190mmHg

(You can convert mmHg to atm by dividing by 760)

Answer: They always have the same functional groups.

Explanation:

use quizlet too if you have toooo

Answer:

they have same physical properties is not true

largest freshwater body on Earth by volume, at 5666 mi³

1 mi³= 4.168  ×  10^12 L

5666 mi³ = 5666 × 4.168 × 10^12 L

  volume   = 2.362 × 10^16 L

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Answer:

Natural gas

Explanation:

Natural gas is a gaseous fossil fuel produced from organic matter that is used to heat homes and cook food.

Natural gas is one of the most volatile part of hydrocarbons that exist together with fossil fuel.

Answer: d) 16.34 grams

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]  

[tex]\text{Moles of} N_2O_5=\frac{31.5g}{108.01g/mol}=0.292moles[/tex]

The balanced chemical reaction given is:

[tex]4N_2+5O_2\rightarrow 2N_2O_5[/tex]  

According to stoichiometry :

As 2 moles of [tex]N_2O_5[/tex] are produced by= 4 moles of [tex]N_2[/tex]

Thus 0.292 moles of [tex]N_2O_5[/tex] are produced by=  =[tex]\frac{4}{2}\times 0.292=0.584moles[/tex] of [tex]N_2[/tex]

Mass of [tex]N_2=moles\times {\text {Molar mass}}=0.584moles\times 28g/mol=16.34g[/tex]

Thus 16.34 g of [tex]N_2[/tex] will be needed

Answer:

ammonia: NH₃

Explanation:

The product is ammonium nitrate, with the chemical formula NH₄NO₃. This salt is composed of the cation NH₄⁺ and the anion NO₃⁻

Nitrate (NO₃⁻) is formed from the strong acid called nitric acid: HNO₃.

Ammonium ion (NH₄⁺) is formed from the weak base ammonia: NH₃.

Thus, the chemical reaction for the formation of the salt is the following:

HNO₃ + NH₃ ⇒ NH₄NO₃

When the magnet on the right is moved toward the suspended magnet on the left, a repulsive force between the two magnets causes the suspended magnet to swing to the left; option B

Magnets are materials which exhibit magnetism or produces a magnetic field.

Magnets attract other objects to themselves and these objects are said to be magnetic.

Magnetic objects include metals such as iron.

A magnet has two ends called poles. The poles of a magnet are the North and South pole.

Magnetic lines of forces begin at the North pole whereas magnetic lines of forces end in at the south Pole.

The law of magnetism states that like poles of a magnet repel each other while unlike poles attract.

Considering the given magnets;

the magnet on the right is moved toward the suspended magnet on the left causing the suspended magnet to move to the left means that the end of the magnets repel each other.

This implies that the ends are two similar ends of the magnets.

In conclusion, unlike ends of a magnet attract whereas unlike ends repel.

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Note that the complete question is given below:

The magnet on the right is moved toward the suspended magnet on the left.

Which statement describes the interactions of the magnets in terms of their magnetic fields?

A. A repulsive force between the two magnets causes the suspended magnet to swing to the left.

B. A repulsive force between the two magnets causes the suspended magnet to oscillate like a pendulum.

C. An attractive force between the two magnets causes the suspended magnet to swing to the right.

D. An attractive force between the two magnets cause the suspended magnet to oscillate like a pendulum.

Answer:

ndcuffaStuff that restrains you from something or someone basicially handcuffs or shackles

Explanation:

Answer:

a limitation or restriction.

OR

stiffness of manner and inhibition in relations between people.

Answer:

a risk to human health or the environment arising from biological work, especially with microorganisms.

Explanation:

Answer:

it it B

Explanation:

He has to be sure to bring enough material (bricks, concrete, steel etc.) so that when the building is finished, it turns out LONG enough to reach all the way from the roof down to the ground.

If there is any gap left, it would be very difficult for the people who work in the offices to get up into the building. Then it could be a complete waste,

The relationship which best describes weathering and erosion is that

Weathering breaks down rock while erosion carries it to a new location.

Weathering involves the breaking down of rock particles into smaller units

which later forms the soil components.

Erosion involves washing away or movement of the uppermost layer of the

soil to a new location/place and an example is the movement of soil

particles when water from rainfall or wind is present.

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Answer:

It's A: Weak & Vulnerable

Answer:

Fe2O3 - S

PbO2 - D

PbO - I

Fe2O - U

Fe(OH)3 - H

FeO2 - T

FeO - R

Pb2O - G

Pb(OH)2 - O

FeOH - N

Pb(OH)3 - A

Explanation:

In writing the formula of ionic compounds we consider the valency or oxidation state of each ion.

For instance, given the compound iron II oxide. The oxidation states of both iron and oxygen are +2 and -2 respectively. Ignoring the charges, this cancels out and we have FeO as the correct formula of the compound.

For Iron III oxide, the oxidation states of iron and oxygen are +3 and -2 respectively, the both atoms exchange charges. If we ignore the signs and write the exchanged numbers as subscripts we obtain the formula Fe2O3.

Answer:

True

Explanation:

Answer:

1.85 x 10^ -5

Explanation:

Answer:

Gravity as well as electrostatic and magnetic attraction and repulsion provide real life examples of forces being exerted by one object on another without them being in contact with each other.

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Answer:

58.4 atoms

Explanation:

To find the remaining amount of atoms, you need to use the half-life formula:

[tex]A = A_0*(\frac{1}{2})^{\frac{t}{h}[/tex]

In this formula,

-----> A = remaining amount (atoms)

-----> A₀ = initial amount (atoms)

-----> t = time passed (years)

-----> h = half-life (years)

The half-life is the amount of time that needs to pass for the initial amount of a substance to decay by 50% (or 1/2). According to the graph, 50% of the initial substance is left after 5,730 years.

A = ? atoms                           t = 16,110 years

A₀ = 410 atoms                     h = 5,730 years

[tex]A = A_0*(\frac{1}{2})^{\frac{t}{h}[/tex]                                        <----- Half-life formula

[tex]A = 410*(\frac{1}{2})^{\frac{16,110}{5,730}[/tex]                                 <----- Insert values

[tex]A = 410*(\frac{1}{2})^{2.81[/tex]                                    <----- Divide 16,110 by 5,730

[tex]A = 410*0.142[/tex]                                      <----- Raise [tex]\frac{1}{2}[/tex] to 2.81

[tex]A = 58.4[/tex]                                                 <-----Multiply 410 and 0.142