Chemistry High School

I need help on this and the first person who answer correctly gets a BRANLIST..
I dont know if I pick the right answer so thats why I need help!!​

I Need Help On This And The First Person Who Answer Correctly Gets A BRANLIST.. I Dont Know If I Pick

Answers

Answer 1

Answer:

1 oxygen

Explanation:

cause H2O= two hydrogen + one oxyge

Related Questions

Which one of the following compounds is insoluble in water?

a) Na2CO3

b) K2SO4

c) Fe(NO3)3

d) ZnS

Answers

Answer: a Na2CO3! I’m really good in this type of stuff xoxo

Answer:

The answer is Na2CO3.Option a

Your opinion on chocolate

What is your opinion on chocolate, any kind like white chocolate dark, etc. also what do you think is the bad side of chocolate?

Answers

Answer:

Milk Chocolate

Explanation:

Some chocolates contain lots of sugar, but for Dark chocolate its healthy

Answer:

Milk chocolate the bad side of chocolate is getting fat

Explanation:

have u ever tried shreks snickers before?

Use the Word Correctly in a Sentence

Ion

Answers

I am studying about Ions in my science class.


What is the percent composition (by mass) of MgBr2?

Answers

Answer:

13.2% Mg, 86.8% Br

Explanation:

Mg has a molar mass of 24.31g/mol.

Bromine has a molar mass of 79.90 g/mol.

There is one mole of Mg and two moles of Br in the compound:

79.90x2 + 24.31 = 184.11

So the total molar mass of MgBr2 is 184.11.

A percent tells us a part of a whole, so we will divide each part of the mass into the whole mass.

24.31g Mg / 184.11g MgBr2 = .132

159.8g Br / 184.11g MgBr2 = .868

Multiply these decimals by 100 to make them into a percent.

.132 x 100 = 13.2% Mg

.868 x 100 = 86.8% Br

Ohio Achievement Test Coach Science, Grade 5
10. Bob first blows whistle hard. Then he blows the same whistle gently. What
changed when Bob blew the whistle the second time?
POSTTEST
A pitch
B. volume
C. pitch and volume
D. frequency

Answers

I think it’s the frequency? Because it lower his voice when he whistle again

Are viruses alive. What makes something alive?



Statement: No cell membrane or other organelles.

Statement: Most viruses do not have the fools to copy their own DNA

Statement: Outside of a host cell viruses do not use energy.

Statement: viruses don't appear to have active processes that respond to the environment

what​

Answers

The correct answer is the last question

What is the charge of the atom in the diagram below?

A. -3
B. +1
C. 0
D.+3

Answers

Answer:

D. +3

Explanation:

have a wonderful day!!

Which 0.1 M solution has a pH greater than 7?
w
1. C6H1206
2.CH3COOH
3.КСІ
4.KOH

Answers

Answer:

4) KOH

Explanation:

Trust

0.1 M KOH has a pH greater than 7.

What is pH?

The pH of a solution is a measure of hydrogen ion (H+) concentration, which is, a measure of acidity.

What is POH?

The  pOH of a solution is measure of hydroxide ions (OH).which is a measure of basicity.

The pH of

CH3COOH is 2.88..КСІ is 7KOH is 12

∴According to the question the pH greater than 7 is KOH

Learn more about pH here: https://brainly.com/question/172153

#SPJ#

is Radon an elementary substance or a compound?

Answers

Answer:elementary substance

Explanation:

Density can be dasdied as a
A physical property of matter
B. chemical property of matter
C. physical change
D. chemical change

Answers

Answer:

A

Explanation:

physical property of matter

- no chemical reaction involved

- involves the measurements of mass and density

4. Explain how radioactive isotopes are used to detect health problems.

Answers

Radioisotopes are widely used to diagnose disease and as effective treatment tools. For diagnosis, the isotope is administered and then located in the body using a scanner of some sort.

Which of these do NOT show malleability a) Iron
b) Sulfur
c) Copper
d) Aluminum​

Answers

Answer:Sulfur

Hope this helps!

Explanation:

Answer Is B) Sulfer !

4. The volume of a gas is 2.5 L when the pressure is at standard pressure (101.325 kPa). What is the
volume of the gas if the pressure decreases to 85 kPa and the temperature of the gas if the pressure is constant?

Answers

Answer:

18.32L

Explanation:

sana makatulong

50g of potassium chloride is dissolved in 500 cm3 of water. Calculate the concentration of the solution. Give your answer in g/dm3

Answers

50g of potassium chloride

If you have 730 moles of a gas at 304 Kelvin in a 4.50 Liter container what
is the pressure of that eas in atmospheres?

Answers

Answer:

4046atm

Explanation:

For this question you can use the ideal gas law,

[tex]PV=nRT[/tex]

Where P is pressure, V is volume, n is moles of substance, R is the constant, and T is the temperature.

Because of the units given, R will equal .08026[tex]P=4046 atm[/tex]

Rearrange the equation to solve for pressure:

[tex]P=\frac{nRT}{V}[/tex]

Then, plug in the values (I'll be excluding units for simplicity, but they all cancel out for pressure in atm):

[tex]P=\frac{(730)(.08206)(304)}{4.5}[/tex]

This will give you:

[tex]P=4046atm[/tex]

Based on what you have learned about the units for measuring thermal energy, complete the following passage.



The unit often used in chemistry and physics to measure energy, such as for work or electrical current, is the
. We can also use this unit, as we did in this lab, for measuring
. This is a property that is quantified by the energy needed per
of material to raise the temperature by one
. The unit for this measure is therefore
.

Answers

Answer:

1.joule 2.specific heat 3.gram 4.degree Celsius 5.J/g°C

Explanation:

I did the lab

Thermal energy is represented in the units joules J. It is the energy needed to raise the temperature by one degree celsius.Per gram this energy is called as specific heat capacity with the unit J/°Cmol.

What is heat capacity?

Heat capacity of a substance is the heat energy required to raise the temperature of the substance by one degree celsius.

If the heat capacity is measure per one mole of a substance it is called specific heat capacity. It is an intensive property whereas heat capacity is an extensive property.

The given passage can be completed as follows:

The unit often used in chemistry and physics to measure energy, such as for work or electrical current, is Joule (J). We can also use this unit, as we did in this lab, for measuring  heat capacity.  

This is a property that is quantified by the energy needed per one gram of material to raise the temperature by one degree celsius.The unit for this measure is therefore J/°Cg.

To find more about heat capacity, refer the link below:

https://brainly.com/question/28921175

#SPJ2

The large number before a molecule in a chemical formula is called a _______________.

O subscript
O coefficient
O equation

Answers

the answer is coefficient

Answer:

Subscript

Explanation:

The little number you see to the right of the symbol for an element is called a subscript. That number indicates the number of atoms of that element present in the compound. When balancing an equation, you can change the coefficients but not the subscripts.

hope this helps! if not, it's got to be coefficient or equation

help please see attached file

Answers

Answer:

balanced equation of glucose

6CO2 + 6H2O----------C6H12O6 + 6O2

in the presence of sun light.

Which of the following represents the molecules of one compound and
atoms of one element?

Answers

Answer:

i think its b.c but I'm not sure

Answer:

A

Explanation:

A is element as all of them look the same

b is mixture of atoms

C is mixture of atoms and compounds

D is just atoms

E is mixture of element and compound

If 0.0015 moles of NaOH is dissolved in 11 L of water, what is the pH of the
solution?

Answers

Answer:

pH = 10.15

Explanation:

NaOH is a strong base so it dissolves completely.

Calculate your [OH-] first by dividing the moles of OH- by the volume.

0.0015 mol OH- / 11 L = 0.00014

Then, calculate the pOH:

pOH = -log[OH-] = -log(0.00014) = 3.85

pOH + pH = 14, so pH = 14 - pOH = 14 - 3.85 = 10.15

Determine the representative particles of
0.075 mol Ti
2.10 mol CO2​

Answers

Answer:

0.o75 mol Ti = 4.5x10∧22

2.10 mol CO2 = 1.26x10∧24 molecules

               hope this helped

A mixture of four gases exerts a total pressure of 960
mm Hg. Gase A each exert 120 mm Hg. Gas B exerts
50 mm Hg. What pressure is exerted by gas C?

Answers

Omitted question:I think you mean Gas A and D each exert 120 mm Hg, if Gas D has a different value , just lug it into he equation as shown below and solve.

Answer:Gas C= 670mmHg

Explanation:

According to Dalton law of partial pressure

The total pressure of a mixture of gases is the sum of the pressures of each gas and can be illustrated as

Pressure total=P1+P2+… +Pn.

Total Pressure = Gas A + Gas B + Gas C + Gas D + Gas...

Now we have

Total Pressure = 120 mm Hg + 50mm Hg + Gas C + 120 mm Hg

960mmHg = 120 mm Hg + 50mm Hg + Gas C + 120 mm Hg

960mmHg =290mmHg +Gas C

Gas C =960mmHg -290mmHg

Gas C= 670mmHg

The following statements were stated by a politician who was paid by the nuclear energy lobby in a debate in favor of nuclear energy:



a. Nuclear energy doesn’t produce a byproduct because the atoms disappear.

b. Nuclear energy produces no polluting gas in its reaction.

c. Nuclear energy does not contribute to global warming.

d. Nuclear energy has low mining and transportation effects on environment.



Which statement is false and should not be used to argue in favor of nuclear energy?



A) Statement A

B) Statement C

C) Statement D

D) Statement B

Answers

Answer:

d

Explanation:

the best state ment is d lol

You are melting a chocolate and accidentally have the stove up to high. the chocolate starts to burn on the bottom of your pot. Physical or Chemical Change?

Answers

Answer:

it is a chemical change because it can't be change back to it normal position when it gets burnt

A student makes observations about a piece of copper. Which
observation describes a chemical property of the copper? (*hint: anything
relating to "measurements" of something is a physical property) *
A. it has a mass of 63.546 grams
B. corrosion occurs when it is exposed to air
C. it has a density of 8.96 g/cm^3

Answers

Answer: b

Explanation:

Which answer choice describes all nonmetals? A. All of the elements of Period 2 in green boxes B. Hydrogen and all of the other elements in orange boxes C. All of the elements of Group 18 in orange boxes D. Hydrogen and all of the elements in blue boxes

Answers

Hello,

An answer is the group of reactive nonmetals and Noble gases.

I am not sure what the colored boxes mean, referring to my periodic table. However, the nonmetals are Hydrogen, Carbon, Nitrogen, etc., including the Noble gases.

Green and purple below, then hydrogen of course.

which situation best represents convection

Answers

Answer:

A hot air balloon taking off

Explanation:

describe each of the three states of matter (solid, liquid, gas)​

Answers

Explanation:

In a solid particles are firmly together and are stuck in a regular pattern

in a liquid particles still touch but arent in a fixed pattern

in a gas particles move quickly in all directions

Which is an example of a double
replacement reaction?
2Na+ Cl2 + 2NaCl
H2SO3 → H20 + S02
2K + 2H20 – 2KOH + H2
NaCl + AgF-NaF + AgCI

Answers

this is an example of displacement reaction
NaCl + AgF-NaF + AgCI

Savvas Realize. Investigation 8 Experiment 1

Answers

Answer:

–1065.25 KJ of energy.

Explanation:

From the question given above, the following data were obtained:

4FeO + O₂ —> 2Fe₂O₃  ΔH = –560.66 kJ

From the balanced equation above,

The formation of 2 moles of Fe₂O₃ released –560.66 kJ of energy.

Finally, we shall determine the amount of heat energy released when 3.8 moles of Fe₂O₃ are produced. This can be obtained as follow:

From the balanced equation above,

The formation of 2 moles of Fe₂O₃ released –560.66 kJ of energy.

Therefore, the formation of 3.8 moles of Fe₂O₃ will release

= (3.8 × –560.66)/2 = –1065.25 KJ of energy.

Thus, –1065.25 KJ of energy is released from the reaction.

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I WILL CROWN YOU BRAINLIEST I NEED HELP ASAP PLS PLS PLSSSSSS tysm to whoever helps me OohBalloons are deflatin'Guess they look lifeless like meWe miss you on your side of the bed, mmmStill got your things hereAnd they stare at me like souvenirsDon't wanna let you out my headJust like the day that I met youThe day I thought foreverSaid that you love meBut that'll last for neverIt's cold outsideLike when you walked out my lifeWhy you walked out my life?I get like this every timeOn these days that feel like you and meHeartbreak anniversary'Cause I remember every timeOn these days that feel like you and meHeartbreak anniversaryDo you ever think of me?No(Ooh) No-no, no(Ooh, ooh, ooh) Ooh, nahI'm buildin' my hopes upLike presents unopened 'til this dayI still see the messages you read, mmmI'm foolishly patient(Foolishly patient)Can't get past the taste of your lips(Taste of your lips)Don't wanna let you out my headJust like the day that I met youThe day I thought foreverSaid that you love meBut that'll last for neverIt's cold outsideLike when you walked out my lifeWhy you walked out my life?I get like this every timeOn these days that feel like you and meHeartbreak anniversary'Cause I remember every timeOn these days that feel like you and meHeartbreak anniversaryDo you ever think of me?Of me'Cause I think of you, think of youGuess the song ;)) What is the mass of an atom with 8 protons, 8 electrons, and 8 neutrons? PLSS HELPPP DUEE TODAYY Problem #1 Simplify the expression. The result of the Hershey-Chase experiment was that radioactivity could be detected inside the bacterial cells when they were infected bybacteriophages marked with phosphorus-32.What did the investigators conclude from this result?A. Bacteriophages inject DNA into the bacterial cells.B. Bacteriophages inject protein into the bacterial cells.C. Bacteriophages inject carbohydrates into the bacterial cells.D. Bacteriophage absorb DNA from bacterial cells. jesse smoke: 10 major events from the book, u clouding page number and character names Four classmates collect data by conducting a poll. They ask students chosen at random how many days a week they buy lunch. Emma interviews 10 students. Dylan interviews 35 students. Megan interviews 75 students. Matt interviews 20 students. Whose results are probably the most trustworthy? A. Dylan's B. Matt's C. Emma's D. Megan's activity 6-10 please help no spam!!! 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