Help me with this . I'm bad at chemistry . I’ll give you a brain list . Don’t answer if u don’t know at all .

Help Me With This . I'm Bad At Chemistry . Ill Give You A Brain List . Dont Answer If U Dont Know At

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Answer 1

Answer:

2.

a.Sodium bromide

b. Magnesium dichloride

c. Lithium iodide

not sure about 3 or 4 sry


Related Questions

The decomposition of ozone, O3, to oxygen, O2, is an exothermic reaction. What is the sign of q?

Answers

Answer:

The sign is negative (-)

Explanation:

it shows that heat was give off to the surrounding

please help me i will give brain list​

Answers

Answer:

a. pentane = C5H12

b. Heptane = C7H16

c. Hexyne = C6H10

d. Octene = C8H16

e. Nonane = C9H20

Hope it helps.

1-pentene

Molecular Formula C5H10

Condensed Structural FormulaCH2=CH(CH2)2CH3

Melting Point (°C)–138

Boiling Point (°C)30

2- heptane is the straight-chain alkane with the chemical formula H3C(CH2)5CH3 or C7H16, and is one of the main components of gasoline (petrol).

A mixture is prepared using 27.00 mL of a 0.0758 M weak base (pKa=4.594) , 27.00 mL of a 0.0553 M weak acid (pKa=3.235) and 1.00 mL of 1.25×10−4 M HIn and then diluting to 100.0 mL, where HIn is the protonated indicator. The absorbance measured at 550 nm in a 5.000 cm cell was 0.1102 . The molar absorptivity (????) values for HIn and its deprotonated form In− at 550 nm are 2.26×104 M−1cm−1 and 1.53×104 M−1cm−1 , respectively. What is the pH of the solution?

Answers

Answer:

pH = 4.164

Explanation:

The first process is to find the initial moles for the base (B) & the acid (HA)

i.e.

[tex]= \dfrac{27 mL \times 0.0758 \ moles \ \ of \ B}{1000 \ mL}[/tex]

[tex]=0.0020466[/tex]

[tex]\simeq 2.047\times 10^{-3} \ moles \ of \ B[/tex]

[tex]= \dfrac{27 mL \times 0.0553 \ moles \ \ of \ HA}{1000 \ mL}[/tex]

[tex]=0.0014931[/tex]

[tex]\simeq 1.493\times 10^{-3} \ moles \ of \ HA[/tex]

The acid with base reaction is expressed as;

          HA              +      B         →             A⁻            +         HB⁺

to    1.493 × 10⁻³       2.047 × 10⁻³             -                         -

    -  1.493 × 10⁻³       1.493 × 10⁻³         1.493 × 10⁻³         1.493 × 10⁻³

            0                    5.54 × 10⁻⁴         1.493 × 10⁻³         1.493 × 10⁻³

From observation; both the acid & base weak

Given that:

The pKa for base = 4.594

The pKa for acid = 3.235

Recall that;

pKa = -log Ka

So; Ka = [tex]\mathbf{10^{-Ka}}[/tex]

By applying this:

For Base; Ka = [tex]10^{-4.594}[/tex] = 2.5468 × 10⁻⁵

For Acid:  Ka = [tex]10^{ -3.235}[/tex] = 5.821 × 10⁻⁴

After the reaction; we have the base with its conjugate acid & conjugate base of acid; Thus, since the conjugate acid of the base possesses a higher value of K, it is likely it would be the one to define the pH of the solution.

By analyzing the system, we have:

              HB⁺         + H₂O           ↔           B          +            H₃O⁺

     [tex]\dfrac{1.493\times 10^{-3}}{0.1 \ L}[/tex]                                 [tex]\dfrac{5.54\times 10^{-4}}{0.1 \ L}[/tex]

to   0.01493 M                                 0.00554   M

  -      x                                                   x                                x

    0.01493 - x                                 0.00554 - x                     x

Thus;

[tex]2.5468 \times 10^{-5} = \dfrac{(0.00554 -x)\times x}{(0.01493-x)}[/tex]

Using the common ion effect;

0.00554 - x   [tex]\simeq[/tex]  0.00554   &

0.01493 -  x   [tex]\simeq[/tex]   0.01493

[tex]x = \dfrac{2.5468 \times 10^{-5} \times 0.01493}{0.00554}[/tex]

x =  [H₃O⁺] = 6.8635  × 10⁻⁵

pH = -log(6.8635  × 10⁻⁵)

pH = 4.164

How many moles of Fe2+ are there in a 2.0g sample that is 80% by mass of FeCl2?

Answers

The number of moles of [tex]Fe^{2+}[/tex] in the [tex]2.0g[/tex] sample of [tex]FeCl_{2}[/tex] is [tex]0.0157[/tex] moles.

The following points should be noted about the number of moles:

The number of moles of any substance can be calculated using the mass and molar mass of the substance. [tex]n = \frac{mass}{molarmass}[/tex], where n is the number of moles.

Mass of the sample given as [tex]2.0g[/tex] and the molar mass of the sample as [tex]126.75g/mol[/tex].

Therefore, the number of moles of  [tex]Fe^{2+}[/tex]is obtained by dividing the mass by the molar mass.

Hence the number of moles is obtained as [tex]0.0175[/tex] moles.

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Which of the following is an essential condition for a combustion reaction?

A - Oxygen is a product.
B - Oxygen is a reactant.
C - Carbon dioxide is a product.
D - Carbon dioxide is a reactant.

Answers

Answer:

oxygen is a reactant.

Explanation:

Combustion is the reaction with atmospheric oxygen forming carbon dioxide and water. Therefore, the essential condition is option B oxygen as a reactant.

What is combustion?

Combustion is a type of reaction in which a molecule or compound reacts with atmospheric oxygen producing carbon dioxide and water. Combustion reaction is exothermic thus, evolves heat during reaction.

The general chemical equation for a combustion reaction can be written as:

[tex]\rm M + nO_{2} \rightarrow xH_{2}O + y CO_{2}[/tex]

Where, M be a reactant.

Combustion is an aerobic process that is only taking place in presence of oxygen. Hydrocarbon gases easily undergo combustion forming heat energy and they are used as fuels propellants.

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Heeellllpppp ASAP ......

Answers

Answer:

I saw B, he vented SUS

Explanation:

Iodoethane Is the answer.

which event would most likely lead to a thunderstorm giving brainliest

Answers

Answer:

A

Explanation:

Took at test on this and my teacher said it was right, hopefully I remembered right, also I answered ur other question like this I think lol

How is continental crust different from oceanic crust?


A: Oceanic crust is thicker and more dense.


B: Oceanic crust is thinner and more likely to sink.


C: Continental crust is thicker and more likely to sink.


D: Continental crust is more dense and lighter.

Answers

Answer:

b

Explanation:

google lol ur welcome

B: Oceanic crust is thinner and more likely to sink.

ln a particular genetic cross, the probability of the offspring having a certain trait is 3/4
Which percentage represents this probability?
O 25%
O 50%
O 75%
O 100%

Answers

Answer:

75%

Explanation:

3/4 is 75% if you multiply by 25

What is rate of reaction?​

Answers

Answer:

The reaction rate or rate of reaction is the speed at which a chemical reaction takes place. Reaction rate is defined as the speed at which reactants are converted into products. Reaction rates can vary dramatically.

Explanation:

PLS MAKE ME AS BRAINLIST

Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.

(plsss help meh.) Describe how you could find the density of a gold crown.

Answers

Answer:

Below! ;)

Explanation:

The formula for finding density is:

Mass/Volume

So for example I have a cube, it has a mass of about 20 grams (not weight) and it's dimensions are about an inchxinchxinch. So basically it is a 20 gram cubic inch cube.

So to find it's density I have to divide mass(=20)/Volume(=1 inch^3). or simplified, 20 ÷ 1 = 20

So the density of my cube is 20..

Hope this helps!

Have a nice day!

If you find my answer helpful

Pls consider marking my answer as Brainliest! It would mean a lot!

Type the correct answer in the box. Express your answer to three significant figures.

A balloon is filled with 0.250 mole of air at 35°C. If the volume of the balloon is 6.23 liters, what is the absolute pressure of the air in the balloon?

Answers

Answer:

102.807 kPa

Explanation:

There are some assumptions to be made in the answer. The air inside the balloon acts as an ideal gas at a given temperature conditions.

Using the combined ideal gas equation.

P= absolute pressure of the air inside the balloon.

V= volume of air inside the balloon (6.23 L= 6.23 * 10⁻³ m³)

n= moles of gas(air). (0.250 mol)

R= Universal gas constant ( 8.314 J / mol·K)

T= Temperature in Kelvin

T= 35 + 273.15 = 308.15 K

P= 102.807 * 10³ Pa

P= 102.807 kPa

HELPPPPPP

is this
1:conduction
2:radiation
3:convection

Answers

Answer:

Radiation

Explanation:

Sun rays shine on earth. Thats radiation.

How do balanced equations demonstrate the law of conservation of mass?​

Answers

Answer:

Every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. ... When an equal number of atoms of an element is present on both sides of a chemical equation, the equation is balanced.

Explanation:

so have a great day

Magnesium has a density of 1.738 g/cmº at 25°C. What is the mass of a block of
magnesium that has a volume of 743 cm??

Answers

Answer:

87.50g(1cm^3/1.1738g)=50.345 cm^3

Explanation:

volume units id in cubic centimeters

Conservation of mass to balance the following reaction. Na2S+ KI= NaI+ K2S

Answers

Answer:

1+2=2+1 is the answer for the question

6. Which scientific law is best demonstrated by the reaction shown in the diagram?
2H2 + O2-2H20
Hydrogen Oxygen Water
ALA
law of universal gravitation
law of angular momentum
law of conservation of energy
law of conservation of mass

Answers

Answer:

law of conservation of mass

Explanation:

According to the law of conservation of mass, mass is neither created nor destroyed.

This is actually the law that guides the balancing of chemical reaction equations.

On the left side we have four atoms of hydrogen and two atoms of oxygen. Exactly the same number of atoms of each element is seen on the right hand side in accordance with the law of conservation of mass.

Gold III Bromide is heated in a flask filled with chlorine gas.
The reactants of this reaction are:
I
The type of reaction is:
The products of this reaction are:

Answers

Answer:

detail is given below.

Explanation:

Chemical equation:

AuBr₃ + Cl₂    →       AuCl₃ + Br₂

Balanced chemical equation:

2AuBr₃ + 3Cl₂    →       2AuCl₃ + 3Br₂

The reactants of this chemical reaction are,

AuBr₃

Cl₂

The product of this chemical reaction is,

AuCl₃

Br₂

Reaction type:

The reaction type is single replacement reaction.

Single replacement:

It is the reaction in which one elements replace the other element in compound.

AB + C → AC + B

In a similar way chlorine replace the bromine and form gold(III) chloride and bromine gas.

Based on details from "Thomas Edison: The Master of Improvement,” how did Joseph Swan and Thomas Edison differ?

Swan liked to experiment, while Edison did not.
Swan was very inventive, while Edison was not.
Swan invented a working lightbulb, while Edison did not.
Swan received a formal education, while Edison did not.

Answers

Answer:

The correct answer is D. Swan received a formal education, while Edison did not.

Explanation:

I did the Unit Test :)

"Thomas Edison: The Master of Improvement,” is about Thomas Edison. Joseph Swan received a formal education, while Thomas Edison did not. Thus, option D is correct.

Who was Thomas Edison?

Thomas Edison was a known American inventor that invented the incandescent light bulb, the camera, phonograph, etc. He used electricity and worked very hard to invent the lightbulb. He received no formal education and believed in self-improvement.

He was a great inventor and fantastic improver that performed various experiments to invent the greatest inventions. Joseph Swan, on the other hand, was a physicist that developed the incandescent light bulb even before Edison.

He invented dry photographic plates and electric lightbulbs. He received proper formal education and sued Edison for the lightbulb patent infringement. He used carbon paper filaments, unlike Edison's metallic filaments in the bulb.

Therefore, in option D. both the scientists, Joseph Swan and Thomas Edison differed in receiving formal education.

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bond energy is the greatest for?​. a: Ch4 b: O2 c: N2 d: Cl2

Answers

It's answer is c. N2

The maximum bond energy is of N2 because N2 molecule is formed by 3 covalent bonds and O2 molecule is formed by 2 covalent bonds.

Hope it helps :)

Someone plz help me write notes (images attached)

Answers

Answer:

I'm not going to give you notes but I'm going to give you a tip for notes take what you think is the most important thing about the text and basically paraphrase it into your own words if that helps

Step 1: (slow)
Step 2: NO3(g) + CO(g) + NO2(g) + CO2(g) (fast)
Overall: NO2(g) + CO(g) + NO(g) + CO2(g)
A two-step reaction mechanism is proposed for a gas-phase reaction, as represented above. Which of the following correctly identifies both the chemical equation for step 1 and the rate law for the overall reaction?
A) The chemical equation for step 1 is 2 NO2(g) → NO(g) + NO3(g), and the rate law is rate = (NO,].
B) The chemical equation for step 1 is NO2(g) + CO(g) + NO(g) + CO2(g), and the rate law is rate = [NO2][CO).
C) The chemical equation for step 1 is NO3(g) + 2 CO(g) + NO(g) + 2 CO2(g), and the rate law is rate = [NO2][CO).
D) The chemical equation for step 1 is NO3(g) + NO2(g) + 2 CO(g) + NO(g) + NO2(g) + 2 CO2(g), and the rate law is rate = [NO3][NO2][CO]".

Answers

Answer:

The chemical equation for step 1 is 2 NO2(g) → NO(g) + NO3(g), and the rate law is rate = k[NO2]^2

Explanation:

We know that the rate determining step is the slowest step in a sequence of non elementary reactions.

As we can see, the first reaction is slow so it is the rate determining step. From here we obtain the rate equation.

Also, the specie NO3 is absent in the overall reaction equation indicating that it is merely an intermediate produced in step 1 and used up in step 2.

The chemical equation for step 1 is [tex]2 NO_2(g) \rightarrow NO(g) + NO_3(g)[/tex], and the rate law is [tex]rate = k[NO_2]^{2}[/tex].

The rate -determining step is the slowest step in a sequence of non -elementary reactions.  The first reaction is slow so it is the rate determining step. From here we obtain the rate law.

Also, the specie [tex]NO_3[/tex]  is absent in the overall reaction equation indicating that it is merely an intermediate produced in step 1 and used up in step 2.

So, the chemical equation for step 1 is [tex]2 NO_2(g) \rightarrow NO(g) + NO_3(g)[/tex], and the rate law is [tex]rate = k[NO_2]^{2}[/tex].

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Jill is recovering from the Flu. At lunchtime, she shares her water bottle with her friend Dara. The next day,
Dara is sick. Which type of Disease is the Flu

Answers

Answer: I think its a virus

Explanation: Viruses spread form person to person just like any virus so if I'm correct the disease is a virus

According to the following reaction, if 69 g of KCIO3, decomposes, how many grams of oxygen will form:
2KCIO3 + 2KCl + 302

Answers

Answer:

28.8g

Explanation:

I think your chemical equation should be:

2KClO3 → 2KCl +3O2

Number of moles of KClO3

[tex] = \frac{mass}{molar \: mass} [/tex]

[tex] = \frac{69}{39 + 35.5 + 3(16)} [/tex]

[tex] = 0.6mol[/tex]

From the equation,

2 mol of KClO3 : 3 mol of 02

So...

0.6 mol of KClO3 : 0.9 mol of O2

Number of moles of O2= 0.9mol

So the mass of O2 formed = number of moles× molar mass

= 0.9 × 2(16)

= 28.8g

If 69 gram of KClO₃ decomposes then 27.036 grams of oxygen will form.

What is Stoichiometry ?

Stoichiometry helps us use the balanced chemical equation to measure the quantitative relationship and it is to calculate the amount of product and reactants that are given in a reaction.

What is Balanced Chemical Equation ?

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

The given balanced equation is

2KClO₃ → 2KCl + 3O₂

According to Stoichiometry, x gram of oxygen will form

= [tex]69\ \text{g of}\ KClO_{3} \times \frac{1\ \text{mol}\ KClO_{3}}{122.55\ g\ KClO_{3}} \times \frac{3\ \text{mol}\ O_2}{2\ \text{mol}\ KClO_{3}} \times \frac{32\ g\ O_2}{1\ \text{mol}\ O_2}[/tex]

= 27.036 grams of Oxygen

Thus from the above conclusion we can say that If 69 gram of KClO₃ decomposes then 27.036 grams of oxygen will form.

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How does adding a lone pair affect the position of existing atoms and lone pairs

Answers

Answer:

How does adding a lone pair affect the position of existing atoms and lone pairs? It decreases the angles between the atoms - the atoms are moving closer because they are being repelled further away from the lone pairs then they are from the other atoms

Explanation:

hope it helps!

They get closer together, the bond angle decreases, etc.

Which stage in a frog's life cycle is most similar to a plant seed?
A Eggs
B. Tadpole
C. Froglet
D. Adult Frog

Answers

A egg because it’s the earliest stage and still had much growth to come to it if properly taken care of

If Oxygen were to gain 2 electrons, the new electron configuration for the oxide ion
would be similar to which neutral atom?
A. Stays the same as Oxygen
B. Sulfur
C. Neon
D. Carbon

Answers

it would be most similar to neon. it wouldn’t be sulfur because that’s in the same group as oxygen and has the same number of electrons. and carbon has less than that so the only one that makes sense is neon

Which phrase describes one type of freshwater wetland?
2
acidic areas found in northern climates
reservoirs created by dams at the end of rivers
areas of high elevation that feed into river systems
small streams that flow into larger streams and wetlands

Answers

Answer:

The correct answer is D

Explanation:

Wetlands are environments that are either submerged under water or are frequently wet. Marshes, swamps, bogs, and fens are examples of freshwater wetlands. Here small streams flow into larger streams and wetlands. The correct option is D.

Ecosystems in freshwater wetlands are impacted by transient or ongoing flooding. They are essential habitats for fauna (including migratory species), play a significant role in the regulation of water flow and water quality to entire catchments, and offer shelter for fauna during droughts.

In tropical and subtropical areas, mangrove swamps are coastal wetlands. In brackish to saline tidal waters, they are distinguished by halophytic (salt-loving) trees, shrubs, and other plants.

Thus the correct option is D.

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A log has a density of .8 g/cm³. What will happen to this log in freshwater, which has a density of 1.0 g/cm³?

It will sink.
It will float.
It will move deeper.
It will decrease in density.

Answers

Explanation:

Objects with a lower density will float while objects with a higher density will sink.

Since 0.8g/cm³ < 1.0g/cm³,

The log will float in freshwater.

help please I need help with these two questions answer truthfully get brainliest?!!​

Answers

Answer:

1. 3x-3=18

Value of x=7

2. 4x-5=23

value of x=7

Answer:

b 7 for one

a 3 for two

Explanation:

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