pls help I I alot of HELP​

Answer:

B. Na and Li

Explanation:

Only lithium and Sodium will have similar properties based on their groupings in the periodic table.

The periodic table of elements shows the arrangement of elements based on their atomic number.

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:

kajjajjanwjsjjsjsjsjsjjsjsj

Explanation:

jqqjjqj

Answer:

No I do not but did you know that you can save 15 or more on car insurance by switching to geico?

Explanation:

Answer:

[tex]\boxed {\boxed {\sf 7 \ protons}}[/tex]

Explanation:

On the Periodic Table, Nitrogen is:

In elements, their atomic number is also equal to the number of protons. As the number of protons in an atom change, so does the identity of the atom.

Since nitrogen has an atomic number of 7, it must always have 7 protons

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]

[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:

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.

Pls vote for brainliest...

Answer:

It's A: Weak & Vulnerable

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

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.

Learn more about magnets at: https://brainly.com/question/14997726

#SPJ1

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.

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:

0.3 or 0.30

Explanation:

The discrepancy between a quantity's measured or inferred value and its actual value is known as the absolute error. The absolute error is insufficient because it provides no information about the significance of the error. The absolute error is -0.3.

An important component of scientific calculations is measurement. Results from measurements that are entirely correct are incredibly unusual. Small mistakes are frequent while monitoring various metrics. Different kinds of errors result in variations in measurement. Mathematical equations can be used to express all faults.

The difference between a quantity's measured value and actual value is used to compute the absolute error. The absolute error is written as, if the measured value is x and the actual value is x₀.

∆x = x₀- x

∆x = 24.3 - 24.6

∆x = -0.3

To know more about absolute error, visit;

https://brainly.com/question/30759250

#SPJ7

Answer:

Solid liquid and gas

Explanation:

Answer:The  standard cell potential, E˚cell =2.234 V, Pb metal is the cathode.

Explanation:

The Half cell reactions are

Pb2+(aq) + 2e– > Pb(s) ------E˚ = –0.136 V

Mg2+(aq) + 2e–>Mg(s)------- E˚ = –2.37 V

In a voltaic cell, reduction occurs at the cathode and oxidation occurs at the anode

 Mg(s)---->Mg2+(aq) + 2e–  ( anodic oxidation)

   Pb2+(aq) + 2e---->  Pb(s)  ( Cathodic reduction)

We can see that Mg  has a more negative reduction potential value leading to having a low reduction potential and therefore will occur at the anode since it will be oxidized. On the other hand Pb2+ has a less negative reduction potential and therefore will have a high reduction making it to occur at the cathode and be reduced

Using  The  standard cell potential, E˚cell = E˚cathode – E˚anode

E˚cell = –0.136 - (–2.37)

E˚cell=2.234 V

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.

More on percentage by mass of substances can be found here: https://brainly.com/question/17592380?referrer=searchResults

The following math operation and report your answer to the

correct number of significant digits is. 4.013×10^-2

now we have given 10.000-9.768/5.78,

we have to find correct significant digits

10.000-9.768 ÷5.78

=0.232÷5.78

=0.04013, it has 4 significant figure

we have to write in significant digit

so 0.04013 = 4.013×10^-2

To know more about  significant digit

visit :https://brainly.com/question/1658998

#SPJ9

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

Answer: This may help you

https://ay.live/BNNBhX

Explanation:

Answer:

B. Zinc burns in the air.

Explanation:

A chemical property of an element is known as the property of that specific element that is apparent or visible when the element has gone through a chemical reaction with other substances or elements under investigation.

In this case, the correct answer is option B which is " Zinc burns in the air" because it shows zinc to react chemically with air which then changes its properties.

The others are just physical properties of zinc

Answer:68.57

Explanation:

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.      

Answer:

jdkskdkakalalalalalakandnxkdmymy

Answer:

Density = M/V

so 3.81/14.3 .266g/ml

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:

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:

Option C 28 Proton 31 neutron 26 elecrtons

Explanation:

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:

Sulfur

Explanation:

The reaction of the following question is as follows:

Na₂S₂O₃ (aq) + 2HCl(aq) --------------⇒2NaCl (aq) + H₂O(l) + SO₂(aq) + S (s)

Precipitate is sulfur.