PLS HELP ME WITH THIS ILL GIVE BRAINLIEST

PLS HELP ME WITH THIS ILL GIVE BRAINLIEST

Answers

Answer 1

Answer:

1 qualiative physical  

2 qualiative   chemical

3 quantitative physcial

4 quantiative chemical

5qualiative   physcial

6quatiative    chemcial

7quanatiative physcial

8 qualiative   chemical

9quatliate  physcial


Related Questions

Which of the following is true regarding the difference between velocity and speed? *

Velocity can be negative whereas speed can only be positive.
Velocity includes a direction whereas speed is a numerical value only.
Velocity relies on displacement whereas speed relies on distance.
All of the above.

Answers

Answer:

All of the above

Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.

Explanation:

Hope it is helpful.....

The definition of symbiotic is
O Having tiny tentacles
O consisting of two oxygen atoms
O having a hard external covering
O living in close association

Answers

Answer:

Living in close association

Explanation:

What is the source of most of the salt in the oceans?
human activities adds salt into the ocean
O rivers and streams carry sediment containing salt to the ocean
O marine fish produce salt adding it into the ocean
wind blows the salt into the ocean

Answers

Rivers and streams though that’s not the wording I would use

Calculate [H+] and [OH-] as required for each of the following
solutions at 25 °C, and state whether the solution is neutral, acidic,
or basic.
a. 1.0x 10-5 MOH-
Q
b. 1.0x 10-7 MOH-
c. 10.0 MH+​

Answers

Explanation:

The relationship between H+ and OH-  at 25 °C is given as;

[H+}  x  [OH-]  = 1.0 x 10-14 M

a. 1.0 x 10-5 M OH-

[OH-] = 1.0 x 10-5 M

[H+] = 1.0 x 10-14 M / [OH-] = 1.0 x 10-14 M  / 1.0 x 10-5 M

[H+] = 1.0 x 10^(-14+5)

[H+] = 1.0 x 10^(-9)

pH = - log [H+]

pH = - log [10^(-9)]

pH = 9

This is a basic solution

b. 1.0 x 10-7 M OH-

[OH-] = 1.0 x 10-7 M

[H+] = 1.0 x 10-14 M / [OH-] = 1.0 x 10-14 M  / 1.0 x 10-7 M

[H+] = 1.0 x 10^(-14+7)

[H+] = 1.0 x 10^(-7)

This is a neutral solution since [H+] and [OH-] are equal

c. 10.0 M H+

[H+] = 1.0 x 10 M

[OH-] = 1.0 x 10-14 M / [H+] = 1.0 x 10-14 M  / 1.0 x 10 M

[OH-] = 1.0 x 10^(-14-1)

[OH-] = 1.0 x 10^(-15)

pH = - log [H+]

pH = - log [10^(1)]

pH = -1

This is an acidic solution since it has a pH of -1

tion 7
In the beginning of the reaction, A B+C, 2 moles of A are taken, out of which 0.5 moles
gets dissociated. What is the amount of dissociation of A?
(1) 0.5
(2) 1
(3) 0.25
(4) 4.2​

Answers

I believe the answer is 4.2


HELP ASAP!!! Plzzz

How many total atoms of oxygen are present in the molecules represented here?

Answers

36 Oxygen atoms !!!!!!

What mass of silver nitrate will be needed to react with 125 grams of magnesium chloride?

Answers

Answer:   m =  4.2 gAgCl

Explanation:  

how does a buffer work?
A. it prevents added acids or bases from dissociating
B. it neutralizes acids or bases by precipitating a salt
C. it forms new conjugate pairs with the added ions
D. it bonds with the added H+ or OH- in solution​

Answers

Answer:

It bonds with the added H+ or OH in solution.

Explanation:

what volume of copper metal is needed to react with 3.5 moles of silver nitrate

Answers

Answer:

3.40 g

Explanation: don't have one :P

A gas has a pressure of 0.0370 atm at 50.0°C. What is the pressure at 0.00°C?

Answers

0.0412 is the answer for the pressure

How many molecules are there in 13.5g of lithium oxide?

please help! ​

Answers

Answer:

the answer is 29.8814

Explanation:

because this is the answer to your question

i looked it up and got 0.45178606089406353 as the exact number
i used an online converter

2. Which of the following could the flame test be used for?

Answers

No options are shown mate

Observe: Click Reset. Select the Gas collection setup. Chemists use this apparatus to collect any gases produced in the reaction. From the reaction flask, gases travel through a long tube and into a cylinder of water. As gases bubble into the cylinder, the water is displaced (removed) until the cylinder is filled with gas. Was any gas produced in the reaction? How do you know? I WILL GIVE POINTS AND BRAINLIEST IF YOU ANSWER CORRECTLY. THANK YOU :)

Answers

Answer:

Due to displacement of water.

Explanation:

If the water is displaced in the cylinder it means that the gas is produced in the reaction while on the other hand, if the water is not displaced in the cylinder so it means that the reaction does not produces any gas yet. So we can say that the displacement of waters indicates or shows us whether the gas is produced in the reaction or not.

What are the main sources of outdoor air pollution and how do they cause smog?​

Answers

Answer:

The common sources of outdoor air pollution are emissions caused by combustion processes from motor vehicles, solid fuel burning and industry. Other pollution sources include smoke from bushfires, windblown dust, and biogenic emissions from vegetation (pollen and mold spores).

smog is produced when sunlight reacts with nitrogen oxides in the atmosphere. Nitrogen oxides come from car exhaust, coal power plants, and factory emissions. When sunlight hits these chemicals, they form airborne particles and ground-level ozone—or smog.

plz need help right away !

Answers

Explanation:

1 mole = 6.02 x 10^23 atoms (Avogadro’s number)

Step 1) Determine how many grams of a substance are in the problem

Step 2) Find the amount of grams in 1 mole of the substance

3) Multiply step one by step two

The theory of evolution states

Answers

Answer:

the theory of evolution states that all living things which exist today, and many more that are now extinct, evolved from simple life forms which first developed 3 billion years ago.

Explanation:

an ionic bond consist of a gas and metal

Answers

Answer: yes

Explanation:

1

Which Element Am I (Core)

Names

1. I have 4 valence electrons and 2 energy levels. Which element am I?

2. Iam in group 16 with 2 energy levels. Which element am I?

3. I am in Period 2 and belong to the same group (family) as silicon. Which element am 1?

4. I have 7 valence electrons and 3 energy levels? Which elementar ?

5. I am in period 3 and I have 12 protons in my nucleus. Which element am 1?

Berr

Sul

ca

3

6

5

6. I am the only element with no neutrons in my nucleus. Which element am 17

6

7. I am the only metalloid with 3 energy levels. Which element am I?

8. I have 1 valence electron and 11 protons, which element am I?

9. Thave only one energy level that is full. Which element am I?

10.1 have 8 valence electrons and I have 4 energy levels. Which element am 1?

10

Answers

Answer:

1) Helium

2) Oxygen

3)Carbon

4) Chlorine

5) Magnesium

Explanation:

Helium has the electron arrangement 2, 2. There are two electrons in the first shell and two electrons in the second shell.

Oxygen is the first member of group 16, there are two energy levels in oxygen which are 2,6.

Carbon is in period 2 and is the first member of group 14 (the silicon family).

Chlorine has 7 valence electrons, the electrons are arranged as 2, 8, 7.

Magnesium has 12 protons and 12 electrons. It is the second member of period 3.

What is the mole percent of ethanol (C2H5OH), which consists of 71.0 g of ethanol for every 18.6 g of water present?A. 87.7%.B. 22.1%.C. 26.5%.D. 73.5%.E. 71.0%.

Answers

Answer:

Mole percent of Ethanol = 0.5986 * 100 = 59.86%

Explanation:

Mole percent is the percentage of the total moles that is of a particular component.

We have to covert the ethanol and water to moles. This is given by the equation;

Number of moles =  Mass / Molar mass

Ethanol;

Number of moles = 71 / 46.07  = 1.5411 mol

Water;

Number of moles = 18.6 / 18  = 1.033 mol

Total mol = 1.5411 mol + 1.033 mol =  2.5741 mol

Mole percent of Ethanol = Number of moles /(Ethanol) / Total moles   * 100

Mole percent of Ethanol =  1.5411 mol / 2.5741 mol   * 100

Mole percent of Ethanol = 0.5986 * 100 = 59.86%

4. Consider the following reaction:
A student performs a neutralization reaction at 298 K according to the following reaction:
NaHCO3 (8) + HCH,O2 (aq) → H20 (1) + CO2 (g) + NaC,H3O2 (aq)
The student adds 1.85 g of solid NaHCO3 into a flask containing 75.0 mL of 0.90 M HCH:02. The student
observes the formation of gas bubbles and also that the flask gets cooler to the touch as the reaction proceeds.
Considering all of the students observations that the student made, is the reaction thermodynamically favorable
at all temperatures, no temperatures, high temperatures or low temperatures. Justify (explain) your selection in
terms of AG

Answers

Answer:

High temperatures

Explanation:

NaHCO₃ (8) + HCH,O₂ (aq) → H₂O (l) + CO₂ (g) + NaC,H₃O₂ (aq)

As the flask gets cooler to the touch as the reaction proceeds, the reaction is endothermic. This means that ΔH is positive (ΔH>0).

As a gas is formed (bubbles are formed), ΔS is positive (ΔS>0).

In terms of ΔG:

ΔG = ΔH - TΔS

In order for the reaction to be thermodynamically favorable, ΔH has to be negative, thus:

The reaction is favorable if TΔS > ΔH.

The greater the temperature, the easier it would be for TΔS to be greater than ΔH.

What do chemists study?
A. The properties of matter and how matter changes
B. How matter and energy interact
C. Mathematical principles
D. Living things
SUBMIT

Answers

A. The properties of matter and how matter changes.

Answer: A. the properties of matter and how matter changes

Explanation:

just got it right

What is the vapor pressure of a solution in which the mole fraction of the solute is 0.200 and the vapor pressure of the pure solvent is 100.0 torr? (Assume a single nonvolatile, nonelectrolyte solute).
a. 0 torr
b. 80.0 torr
c. 100.0 torr
d. 120.0 torr
e. 20.0 torr

Answers

Answer: The vapor pressure of a solution in which the mole fraction of the solute is 0.200 is 80.0 torr

Explanation:

As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.

The formula for relative lowering of vapor pressure will be,

[tex]\frac{p^o-p_s}{p^o}=i\times x_2[/tex]

where,

[tex]p^0[/tex]= vapor pressure of pure solvent = 100.0 torr

[tex]p_s[/tex] = vapor pressure of solution = ?

i = Van'T Hoff factor = 1 for nonvolatile, nonelectrolyte solute

[tex]x_2[/tex] = mole fraction of solute  = 0.200  

[tex]\frac{100.0-p_s}{100.0}=1\times 0.200[/tex]

[tex]p_s=80.0torr[/tex]

The vapor pressure of a solution in which the mole fraction of the solute is 0.200 is 80.0 torr

Which planet has these characteristics? - the only planet to have liquid water on its surface - almost three quarters of its surface is covered in water - has a nearly circular orbit

Answers

well assuming we have all of these, earth

what’s the answer please

Answers

Answer:

5 × 10⁻³ mol

Explanation:

Step 1: Given data

Volume of HCl solution (V): 25 cm³Molar concetration of the HCl solution (C): 0.2 mol/dm³

Step 2: Convert "V" to dm³

We will use the conversion factor 1 dm³ = 1000 cm³.

25 cm³ × 1 dm³/1000 cm³ = 0.025 dm³

Step 3: Calculate the moles of HCl (n)

We will use the definition of molarity.

C = n/V

n = C × V

n = 0.2 mol/dm³ × 0.025 dm³ = 5 × 10⁻³ mol

2. How many moles are there in 20 grams of Carbon?

Answers

Answer:

1.6666666666666 is the ans bcz in each mole there r 12 grams of carbon so the ans is goingtobe 20÷12

According to the mole concept, there are 1.66 moles in 20 grams of carbon.

What is a mole?

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Number of moles is calculated as, mass/molar mass, thus on substitution , number of moles=20/12=1.66 moles.

Thus, there are 1.66 moles in 20  grams of carbon.

Learn more about moles,here:

https://brainly.com/question/26416088

#SPJ6

How to set up the rate expressions for the following mechanism?

A → B k1
B → A k2
B+C → D k3

If the concentration of B is small compared with the concentrations of A, C, and D, the steady-state approximation may be used to derive the rate law. Derive the rate law, and show that this reaction may follow the first-order equation at high pressures and the second-order equation at low pressures.

Answers

Answer:

Explanation:

From the given information:

A → B k₁

B → A k₂

B + C → D k₃

The rate law = [tex]\dfrac{d[D]}{dt}=k_3[B][C] --- (1)[/tex]

[tex]\dfrac{d[B]}{dt}=k[A] -k_2[B] -k_3[B][C][/tex]

Using steady-state approximation;

[tex]\dfrac{d[B]}{dt}=0[/tex]

[tex]k_1[A]-k_2[B]-k_3[B][C] = 0[/tex]

[tex][B] = \dfrac{k_1[A]}{k_2+k_3[C]}[/tex]

From equation (1), we have:

[tex]\mathbf{\dfrac{d[D]}{dt}= \dfrac{k_3k_1[A][C]}{k_2+k_3[C]}}[/tex]

when the pressure is high;

k₂ << k₃[C]

[tex]\dfrac{d[D]}{dt} = \dfrac{k_3k_1[A][C]}{k_3[C]}= k_1A \ \ \text{first order}[/tex]

k₂ >> k₃[C]

[tex]\dfrac{d[D]}{dt} = \dfrac{k_3k_1[A][C]}{k_2}= \dfrac{k_1k_3}{k_2}[A][C] \ \ \text{second order}[/tex]

3. Which state of matter has a defined shape?
HELP FAST

Answers

Answer:

Solid state of matter has a definite shape

The answer to this is solids!

What is the electronegativity and bond polarity like in the "head" vs. the "tail" ends of soap?

Answers

Answer:

gay

Explanation:

very gay

How many moles of Ca(OH)2 are needed to make 2.5 moles of CaCl2?

Answers

Explanation:

CaCl2 ⇄ Ca-²+2Cl-¹

1mole⇄1mole+2moles

So from above ..

1mole CaCl2 produce 1mole Ca-² & 2 moles of Cl-².

For 2.5 moles we multiply the above chemical eq. With 2.5

2.5CaCl2⇄2.5Ca-²+5Cl-¹

So from 2.5 moles of CaCl2 we get 2.5 mole calcium ion and 5 moles chloride ion…

How will this system at equilibrium be affected by each of the conditions stated here? 2 Upper H Subscript 2 Baseline (g) + Upper O Subscript 2 Baseline (g) double-headed arrow 2 Upper H Subscript 2 Baseline Upper O (g) + heat. removal of H2O addition of O2 decrease in pressure increase in temperature

Answers

Answer:

removal of H2O

✔ System will shift toward the products.

addition of O2      

✔ System will shift toward the products.

decrease in pressure

✔ System will shift toward the reactants.

increase in temperature      

✔ System will shift toward the reactants.

Explanation:

The reaction Equation :

2H₂ (g)  + O₂ (g) ↔ 2H₂O (g) + heat

Answer :

a) Removal of H₂O : The system will move towards the products of the reaction

b) addition of O₂ : The system will move towards the products of the reaction

c) decrease in pressure : The system will tend to move towards the reactants

d) Increase in temperature: The system will tend to move towards the reactants as well

Reason

In an equilibrium reaction changes to reactant components surroundings/conditions in which the reaction is been carried out can cause a significant change in the entire reaction process.

Hence; Removal of H₂O will cause the reaction system to move towards the products also the addition of O₂ will make the equation of the  reaction system move towards the product

Decrease in pressure and Increase in temperature causes the equation to move towards the reactants of the reaction

Learn more about equilibrium reaction : https://brainly.com/question/16878977

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PLEASE HELP ME ASAPP!!!What part of Canadian history impacted u the most and why A small, rocky island is home to a community of organisms. They include birds,insects, lichen, moss, shrubs, and small plants. Flooding during a storm damages theecosystem, except for the lichen and moss.Two students observe the changes to the island community during and after thestorm. Chandra classifies the changes as primary succession, whereas Brendaclassifies them as secondary succession. Which argument is supported by theevidence? GIVING BRAINLIEST QUICK From least in danger to most in danger, put the words in order: endangered, vulnerable, dormant, at risk, threatened, severely endangered, dormant.Help me please I give 50 for it "I think that people can't be trusted. They need to be controlled in order for society to work well." This statement expresses the views of 5.2.PS-14Find 3 ratios that are equivalent to the given ratio.10:16 If f(x) = 5x, what is f-1 (x)?F-1(x) = -5xF-1(x) =-1/5xF-1(x) =1/5xF-1(x) = 5x Find the volume of the pyramid below.5.6 ft :6 ft3 ft what are some consequences of climate change How would the plot most likely be different if the Selenites were portrayed as being more like humans?A. Mr. Bedford would be more inclined to communicate with the Selenites rather than fight.B. Mr. Bedford and Mr. Cavor would not be interested in leaving the moon.C. Mr. Bedford and Mr. Cavor would be forced to fight an enemy with equal strength and more intellect than themselves.D. Mr. Bedford would view the Selenites as fierce fighters. for you why entrepreneurship is important? Regina is writing an argument against adding fluoride to the city's drinking water. Which statement best introduces the topic?A. Even the Food and Drug Administration would agree that we are flooded with toxins and chemicals; therefore,we should carefully consider the facts before adding more fluoride to our drinking water.B. Adding a known drug to our drinking water is not responsible, and a lot of people agree with me on this issue;even the Food and Drug Administration has admitted that fluoride is a drug subject to regulation.C. The Food and Drug Administration stated in 2000 that fluoride is a drug subject to regulation when it is "usedin the diagnosis, cure, mitigation, treatment, or prevention of disease in man or animal" and, therefore,deserves careful attention as we consider adding it to our water supply.D. Because the Food and Drug Administration has stated in 2000 that fluoride is a drug subject to regulationwhen it is used in the diagnosis, cure, mitigation, treatment, or prevention of disease in man or animal," wewould be pathetically misguided to put it in our water supply. In LMN, the measure of N=90, NL = 6.8 feet, and LM = 9.4 feet. Find the measure of L to the nearest tenth of a degree. Find the value of sin theta, if tan theta = 4; 180 < theta A kangaroo can jump 6 times the length of its body. For a kangaroo that is 5 feet long, how many feet can it jump? * What can be inferred from the graph? If sin(x) = 0.4, then what is tax (x)? Find the volume of the sphere. Round your answer to the nearest tenth. A hormone can have different effects in different species?A. TrueB. FalseC. Cannot be decided Write a summary of The Diary of Anne Frank, Act II.