Examine the Lewis structure.
H—H-O:
What is incorrect in the structure? Check all that
apply.
The middle hydrogen is surrounded by 4
electrons.
Oxygen is surrounded by 8 electrons.
The middle hydrogen is bonded to 2
elements.
There are too many electrons in the final
structure.

Explanation:

1.ca

2.H

3.O

.................

Answer:

Yes

Explanation:

Answer: both are correct

Explanation:

Answer:

2Na2O2 + 2H2O → 4NaOH + O2 is the balanced ver of Na2O2 + H2O - NaOH + O2

Explanation:

Answer:

Mass of ammonia produced= 34 g            

Explanation:

Given data:

Mass of ammonia produced = ?

Number of moles of nitrogen = 1.0 mol

Solution:

Chemical equation:

N₂ + 3H₂       →    2NH₃

Now we will compare the moles of ammonia and nitrogen.

                   N₂          :          NH₃

                    1           :           2

Mass of ammonia:

Mass = number of moles × molar mass

Mass =    2 mol × 17 g/mol

Mass = 34 g                  

Answer:

It is a method used to identify a suspect.

Explanation:

DNA fingerprinting is a method used to identify an individual from a sample of DNA by looking at unique patterns in their DNA.

Given :

Volume of NaCl solution 2.5 L .

Molarity of NaCl solution is 0.070 M .

To Find :

How many moles are present in the solution.

Solution :

Let, n be the number of moles.

We know, molarity is given by :

[tex]M = \dfrac{n}{V(in\ L)}[/tex]

So,

[tex]n = M \times V\\\\n = 0.070\times 2.5 \\\\n = 0.175\ moles[/tex]

Therefore, number of moles of NaCl is 0.175 moles.

Answer: Nitrogen

Explanation: The atmosphere is actually mostly Nitrogen at 78% not oxygen.

Answer:

152.26 mmHg

Explanation:

pv=p'v'

525× 25=p'×86.2

p'=525×25÷ 86.2

p'=152.26

From the options, the reaction that shows the conservation of atoms is 4Fe + 302 → 2Fe2O3.

The idea of the conservation of atoms is that the number of atoms on the right hand side is equal to the number of atoms on the left hand side.

In this case, we have to a reaction equation which is balanced which is 4Fe + 302 → 2Fe2O3.

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Mg

...

.....

......

..............

Answer: 1.5 x 10 24

Explanation:

One mole of NaCl contains 6.022 x 1023 NaCl formula units

In 2.5 moles of NaCl there will be basically 5 moles of ions as per the given data.

A material created by joining two or more distinct elements chemically in science.

A compound in chemistry is a material comprised of two or more separate chemical elements mixed together in a certain proportion.

Chemical connections that are challenging to break are created when the elements interact with one another.

2.5 mol of NaCl contains 5 moles of ions. This is due to the fact that 1 mol of NaCl contains 2 mol of ions, so you must multiply the molecular weight of the molecule by two to obtain the number of ions.

Thus, the answer is 5 moles.

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You are stirring a bowl of hot soup with a metal spoon. The spoon starts to feel warmer, this represents conduction.

One of the three primary methods for the transfer of heat energy is conduction. Radiation and convection are the other two methods through which heat is transferred. Heat energy is transferred through the mechanism of conduction when nearby atoms or molecules collide.

In liquids and solids where particles are more closely spaced, conduction happens more easily than in gases, wherein particles are more widely spaced. When there is a significant temperature differential between both the substances that are in contact, the rate of energy transfer through conduction is increased.  You are stirring a bowl of hot soup with a metal spoon. The spoon starts to feel warmer, this represents conduction.

Therefore, the correct option is option A.

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Answer:

B

Explanation:

Answer:

A. Chemistry can help a chef understand how to combine different ingredients in a recipe.

Explanation:

Knowing the chemical reactions between ingredients used in cooking helps chefs understand how well different ingredients would react to eachother.

*Im pretty sure this is correct.

Answer:

2C8H18 + 25O2 → 16CO2 + 18H2O

Explanation:

Explanation:

Electronic Configuration for Li: 1s²2s¹

Electronic Configuration for Cl: [Ne]3s²3p⁵

When Lithium and Chlorine bonds together, the electron in the Lithium 2s subshell will be transfered to the Chlorine 3p subshell, giving both the Lithium and Chlorine atoms a complete 1st and 3rd energy levels respectively.

Formula for Lithium chloride: LiCl.

Answer:

1 and 4

Explanation:

Answer:

1 and 4 is correct

Explanation:

(;

Answer:

2.7 moles of Fe₂O₃ is the maximum amount that can be produced. Iron is the limiting reactant.

Explanation:

The balanced reaction is:

4 Fe + 3 O₂ → 2 Fe₂O₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

You can use a simple rule of three as follows: if by stoichiometry 4 moles of Fe reacts with 3 moles of O₂, how much moles of Fe will be needed if 4.7 moles of O₂ react?

[tex]moles of Fe =\frac{4. moles of Fe*4.7 moles of O_{2}}{3 moles of O_{2} }[/tex]

moles of O₂= 6.27

But 6.27 moles of Fe are not available, 5.4 moles are available. Since you have less moles than you need to react with 4.7 moles of O₂, iron Fe will be the limiting reagent.

So you can use a simple rule of three as follows: if by stoichiometry 4 moles of Fe produce 2 moles of Fe₂O₃, how many moles of Fe₂O₃ will be produced if 5.4 moles of Fe react?

[tex]moles of Fe_{2}O_{3}=\frac{5.4 moles of Fe*2 moles of Fe_{2} O_{3} }{4 moles of Fe}[/tex]

moles of Fe₂O₃= 2.7 moles

Then:

2.7 moles of Fe₂O₃ is the maximum amount that can be produced. Iron is the limiting reactant.

Answer:

A compound is a substance in which the atoms of two or more elements are chemically combined in a fixed proportion.

Explanation:

The correct answer is that a compound is a substance in which the atoms of two or more elements are chemically combined in a fixed proportion.

A compound is a substance composed of two or more kinds of atoms joined together in a definite grouping.

The properties of a compound are distinct and different from those of the individual elements that are combined in its make - up.

There are several millions of compounds known.

An element is a distinct substance that cannot be split-up into simpler substances. They are made up of only one kind of atom.

Answer:

3 moles of CO are needed

Explanation:

Given data:

Number of moles of CO used = ?

Mass of Fe produced = 112 g

Solution:

Chemical equation:

Fe₂O₃ + 3CO      →        2Fe + 3CO₂

Number of moles of Fe:

Number of moles = mass/ molar mass

Number of moles = 112 g/ 55.85 g/mol

Number of moles = 2.00 mol

Now we will compare the moles of iron and CO.

                   Fe        :         CO

                   2          :         3

Thus, 3 moles of CO are needed.

Answer:

I think the elements are carbon, hydrogen and oxygen but I'm not completely sure.

Answer:

I believe that it is B

Explanation:

Answer:

Precipitates indication release of gas

Or just vapor-again indictaing release of gas

Change in melting/boiling point, change in pH

Change in temperature

Answer:

Explanation:

these signs show that the chemical reaction has taken place.

Explanation:

The two ways that energy can be transferred are by doing work and by heat transfer.

Answer:

The balanced equation is :

Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)

Answer:

all

Explanation:

water vapor is everywhere

ice is in the freezer and hopefully you drink water.  

The molar concentration of the original HF  solution : 0.342 M

Given

31.2 ml of 0.200 M NaOH

18.2 ml of HF

Required

The molar concentration of HF

Solution

titration formula

M₁V₁n₁=M₂V₂n₂

n=acid/base valence (amount of H⁺/OH⁻, for NaOH and HF n =1)

Input the value :

[tex]\tt 0.2\times 31.2=M_2\times 18.25\\\\M_2=0.342[/tex]

Answer:

(a) By the ideal gas law, the temperature of the gas is approximately 423.51129 K

(b) By the Van der Waals equation, the temperature of the gas is approximately 442.00558 K

Explanation:

The given parameters are;

The mass of the methane gas, m = 60 g

The volume of the container in which the gas is placed, V = 1.00-L

The pressure of the gas in the container, P = 130 atm

The molar mass of methane, CH₄ = 16.04 g/mol

The Van der Waals Constant for Methane (CH₄) a = 2.253 atm L²·mole⁻² and b = 0.04278 L·mol⁻¹

The universal gas constant, R = 0.08206 L·atm·mol⁻¹·K⁻¹

The number of moles of methane present, n = 60.0 g/(16.04 g/mol) ≈ 3.7406 48 moles

(a) The ideal gas law is P·V = n·R·T

Where;

P = The pressure of the gas

V = The volume of the gas

R = The universal gas constant

T = The temperature of the gas

n = The number of moles of the gas

Therefore, T = P·V/n·R

By substituting the known values of the variables, we get;

T = 130×1/(3.740648 × 0.08206) ≈ 423.51129 K

The temperature of the gas, T ≈ 423.51129 K

(b) The Van der Waals equation of state;

[tex]n \cdot R \cdot T = \left (P + a \cdot \dfrac{n^2}{V^2} \right) \cdot (V - n\cdot b)[/tex]

Therefore, we have;

[tex]T = \dfrac{ \left (P + a \cdot \dfrac{n^2}{V^2} \right) \cdot (V - n\cdot b)}{n \cdot R}[/tex]

Therefore, we have;

[tex]T = \dfrac{ \left (130 + 2.253 \times \dfrac{3.740648^2}{1^2} \right) \times (1 - 3.740648\cdot 0.04278)}{3.740648 \times 0.08206} = 442.00558 \ K[/tex]

The temperature of the gas, T ≈ 442.00558 K.

Answer:

Igneous rocks must go through the sedimentary process to change into metamorphic rocks. Igneous rocks are chemically changed into metamorphic rocks because of high temperature and pressure. Metamorphic rocks are formed from melting igneous rocks. Metamorphic rocks and igneous rocks do not follow a rock cycle.

Explanation:

hope this helps!

Answer:

C

Explanation:

It's igneous rocks must go through the sedimentary process answer thing

Answer: oxidation reactions

Explanation: