Why does oxygen have a 2 next to it?

Answers

Answer 1

Answer: In the above reaction oxygen is written as O2 because it is diatomic.

Explanation:


Related Questions

How do you balance C4H10 + Cl2 + O2 —> CO2 + CCl4 + H2O?

Answers

Answer:

4C4HO + 4Cl2 + 13O2 → 14CO2 + 2CCl4 + 2H2O

Explanation:

Balance The Equation: C4HO + Cl2 + O2 = CO2 + CCl4 + H2O

1. Label Each Compound With a Variable

  aC4HO + bCl2 + cO2 = dCO2 + fCCl4 + gH2O

2. Create a System of Equations, One Per Element

  C: 4a + 0b + 0c = 1d + 1f + 0g

  H: 1a + 0b + 0c = 0d + 0f + 2g

  O: 1a + 0b + 2c = 2d + 0f + 1g

  Cl: 0a + 2b + 0c = 0d + 4f + 0g

3. Solve For All Variables

  a = 4

  b = 4

  c = 13

  d = 14

  f = 2

  g = 2

4. Substitute and Verify Result

  4C4HO + 4Cl2 + 13O2 = 14CO2 + 2CCl4 + 2H2O

      L R

  C: 16 16 ✔️

  H: 4 4 ✔️

  O: 30 30 ✔️

  Cl: 8 8 ✔️

hope this helps! :D

Is combining ammonium chloride and water a physical or chemical change

Answers

No, ammonium chloride in water is not a physical reaction. It is a chemical reaction. Hope this helps!

Learning about the parts of an atom is important because

It can help us create a better model of an atom.
It can help us create new elements.
It can help us study how cells in the body functions.
It can help us explain the universe.

Answers

Answer:

"it can help us explain the universe" or "it can help us study how cells in the body function"

Explanation:

you choose which one you want but their still both technicly right

Why is it hot in summer and in the winter why is cold

Answers

Answer: The sun is closer to the Earth is the summer and farther in the winter causing it to be hotter than it is colder in the summer and vise versa for the other question.

Explanation: I learned it ;)

Explanation:

The earth is tipped on its axis, 23.5 degrees in respect to the sun. In the summer time, the northern hemisphere has slightly more hours of daylight because of this, becoming more extreme as one goes north. If you go far enough north, there is 24 hours of sunlight in high summer.

So the average temperature is higher, because there is sunlight is present for more hours and the earth is warmed on balance.

At the same time, the south pole is in shadow, so the southern hemisphere has winter in June.

Six months later, the 23.5 degree tilt has the north pole facing away from the sun, and with fewer daylight hours, the temperature cools progressively. Meanwhile, the southern hemisphere is having it’s summer in December.

The attractive forces between sodium and chloride ions are called:
a)Bonding Forces
b)Gravity Forces
c)Pulse Forces
d)Interparticle Forces

Answers

Dipole-dipole forces are probably the simplest to understand. You probably already know that in an ionic solid like NaCl, the solid is held together by Coulomb attractions between the oppositely-charges ions. The Na+ and Cl- ions alternate so the Coulomb forces are attractive

Mercury (Hg) is present in trace amounts in coal, ranging from 50.0 to 200.0 ppb. A typical power plant burns 1.49 million tons of coal per year. Calculate tons of mercury in the coal based on the lower (50.0 ppb) and higher (200.0 ppb) concentrations.

Answers

Answer and Explanation:

To calculate this, simply use an equality of proportions:

50 particles  :  1 billion particles = x tons  :  1.49 million tons

The value of x can be solved for by multiplying the ratio on the left by the value 1.49 million / 1 billion:

So, x = (50)(0.00149) tons = 0.0745 tons

Then, do the same thing for the larger concentration:

x = (200)(0.00149) tons = 0.298 tons

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Answers

Answer:

Full answer in explanation

Explanation:

High Tide - when tides are at their highest elevationLow Tide - when tides are at their lowest elevationSpring Tide - when tides experience the greatest range between high and low; occur at New and Full MoonsNeap Tide - when tides experience the least range between high and low; occur at 1st and 3rd Quarter MoonsGravitational Pull - the invisible force that exists between all objects that have mass. The greater the mass, the greater the effect of the forceTide - the daily change in ocean levels due to the gravitational force of the moon and the sun exerted on Earth

Hope this helps!

An empty beaker weighs 20g and when filled with
Kensene weighs 60g. If the Volume of the kerosene is 15cm2 calculate
the density of the kerosene

Answers

Answer: The density of kerosene is \(2.7g/cm^3\)

Explanation:

Density is defined as the mass contained per unit volume.

\(Density=\frac{mass}{Volume}\)

Given : Mass of kerosene = mass of beaker with kerosene - mass of empty beaker = 60 g - 20 g = 40 g

Volume of kersone = \(15cm^3\)

Putting in the values we get:

\(Density=\frac{40g}{15cm^3}\)

\(Density=2.7g/cm^3\)  

Thus the density of kerosene is \(2.7g/cm^3\)

WILL GIVE BRAINLIEST
The table shows the number of reactants and products present during two separate chemical reaction

Which of the following statements correctly identifies the decomposition reaction and describes a substance involved?
Chemical reaction A, because the reactant is a compound
Chemical reaction B, because the product is a compound
Chemical reaction A, because the reactant is an element
Chemical reaction B, because the product is an element

WILL GIVE BRAINLIESTThe table shows the number of reactants and products present during two separate

Answers

Answer:

Chemical reaction A, because the reactant is a compound

Explanation:

In a decomposition reaction, a compound is broken down into its components, so the number of products is greater than the number of reactants

Chemical reaction A, because the reactant is a compound is a statements correctly identifies the decomposition reaction and describes a substance involved.

What is chemical reaction?

When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.

Although a chemical reaction is not always a "one-way street," as we'll examine further in the next section, an arrow is drawn between the reactants and products to denote the direction of the reaction.

 Our equation must have them in it in order for there to be an equal number of atoms of each element on both sides of the equation.

Therefore, Chemical reaction A, because the reactant is a compound is a statements correctly identifies the decomposition reaction and describes a substance involved.

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What does the notation tt mean to geneticists? *

What does the notation tt mean to geneticists? *

Answers

Answer is B



........

How your life would be affected if there was no more electricity?

Answers

Answer:

Lots of bad things would happen

Explanation:

People would lose their jobs

People would fall out of contact (no phones)

It would be pretty dark (no streetlights)

You would have to learn everything by book or asking someone

ect.

Answer: My life would change drastically.

Explanation:

This is because electricity is used in my everyday life . If I no longer had electricity then i would have to change my whole life and how I did things . I would have to adapt to my new environment without electricity.

Help please!!, It is URGENT
Can two different liquids have the same density? Explain.
(if you don't know don't answer).​

Answers

Answer:

No

Explanation:

There is a chart made just for density. It finds whatever liquid you want based on the density. 2 liquids cannot have the same density.

Two liquids that have the same volume don't necessarily have the same density. Density = mass/volume, so they would only have the same density if they also have the same mass.

Density is an intensive property, which means that it doesn't depend on the amount of the substance present

the nuclear mass of cl37 is 36.9566 amu. calculate the binding energy per nucleon for cl37 .

Answers

The binding energy per nucleon for a nucleus can be calculated using the formula: BE/A = (Zmp + (A-Z)mn - M)/A. so binding energy is BE/A = -0.026.

For Cl37, Z = 17 and A = 37, so the number of neutrons, N, is 20. The mass of a proton is approximately equal to 1 amu, and the mass of a neutron is approximately equal to 1.0087 amu. The nuclear mass of Cl37 is given as 36.9566 amu.

BE/A = [(17 × 1) + (20 × 1.0087) - 36.9566]/37

BE/A = (27.1709 - 36.9566)/37

BE/A = -0.026

The binding energy per nucleon for Cl37 is approximately -0.026 amu. This negative value indicates that the nucleus is not stable and may undergo radioactive decay to become more stable.

The binding energy per nucleon is a measure of the stability of an atomic nucleus. The higher the binding energy per nucleon, the more stable the nucleus. In the case of Cl37, the binding energy per nucleon can be calculated using the formula: Binding energy per nucleon = (total binding energy of nucleus) / (total number of nucleons)

The total binding energy of a nucleus can be calculated using the formula: Total binding energy = (atomic mass defect) x (c^2)

where c is the speed of light.The atomic mass defect is the difference between the mass of an atomic nucleus and the sum of the masses of its constituent protons and neutrons.

Using the given nuclear mass of Cl37, the atomic mass defect can be calculated. From there, the total binding energy and binding energy per nucleon can be determined.

Once calculated, the binding energy per nucleon of Cl37 can be compared to the average binding energy per nucleon for stable nuclei, which is around 8.5 MeV. If the binding energy per nucleon for a given nucleus is lower than this average, it is less stable than average, while a higher value indicates greater stability

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I will give brainiest how does a orange get its color

Answers

Answer:

by mixing red and yellow

Explanation:

Answer:

Either the sun or by mixing red and yellow together because they make orange.

Explanation:

Brainliest pls

A gas is contained in a cylinder with a volume of 4.3 L at a temperature of 30.3oC and a pressure of 766.9 torr. The gas is then compressed to a volume of 0.38 L, and the temperature is raised to 839.0oC. What is the new pressure of the gas? Express your answer in atmospheres (atm)

Answers

The ideal gas law can be used to determine the gas's new pressure. According to the ideal gas law, pressure times volume equals the amount of a gas in moles times the global gas constant times the temperature.

Pressure = (number of moles of gas times the universal gas constant times the temperature) divided by volume is the new equation we may use to calculate pressure.

Since there are an equal amount of moles of gas in this situation, we can use the following formula to determine the new gas pressure: Pressure is equal to (4.3 L times 839.0oC) divided by (766.9 torr times 0.38 L). We obtain a new pressure of 118.6 atm by simplifying.

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Emissions of sulfur dioxide by industry set off chemical changes in the atmosphere that result in acid rain. The acidity of liquids is measured by pH on a scale from 0 to 14. Distilled water has a pH of 7.0 and lower pH values indicate acidity. Theory suggests that the pH of rain varies among rainy days according to a normal distribution with a mean of 5.4 and a standard deviation of 0.5. The random sample of 21 days gives a sample standard deviation of 0.8. You would like to test if the population standard deviation is indeed 0.5 as the theory suggests. At alpha equals 0.05, what is the test statistic and what are the critical values? The test statistic: 53.76. Critical values: 9.591 and 34.170. The test statistic: 53.76. Critical values: 10.283 and 35.479. The test statistic: 51.20. Critical values: 10.283 and 35.479. The test statistic: 51.20. Critical values: 9.591 and 34.170.

Answers

The main answer to the question is: The test statistic is 51.20 and the critical values are 9.591 and 34.170.

To explain the main answer, we are conducting a hypothesis test to determine if the population standard deviation of the pH of rain is indeed 0.5, as suggested by the theory. The null hypothesis (H0) is that the population standard deviation is 0.5, while the alternative hypothesis (H1) is that the population standard deviation is not 0.5.

In this case, we are given a random sample of 21 rainy days, and the sample standard deviation is 0.8. To test the hypothesis, we need to calculate the test statistic, which is given by the formula: test statistic = [(sample standard deviation) - (hypothesized standard deviation)] / (sample standard deviation / sqrt(sample size)).

Plugging in the values, we get: test statistic = [(0.8 - 0.5) / (0.8 / sqrt(21))] = 51.20.

To determine the critical values, we need to look at the critical region associated with the given significance level (alpha) of 0.05. Since this is a two-tailed test, we divide the significance level by 2, resulting in an alpha of 0.025 for each tail. Using the degrees of freedom (n-1), which is 20 in this case, we can consult the t-distribution table or use a statistical software to find the critical t-values. For an alpha of 0.025 and 20 degrees of freedom, the critical t-values are approximately ±2.093.

Converting the t-values to critical values using the formula: critical value = (hypothesized standard deviation) + (t-value * (sample standard deviation / sqrt(sample size))), we get: critical values = 0.5 + (2.093 * (0.8 / sqrt(21))) = 9.591 and 0.5 - (2.093 * (0.8 / sqrt(21))) = 34.170.

Therefore, the correct answer is: The test statistic is 51.20 and the critical values are 9.591 and 34.170.

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Potassium iodide and lead(II) nitrate solutions react together to form a precipitate of lead(II) iodide: 2KI(aq) + Pb(NO3)2(aq) → PbI2(s) + 2KNO3(aq) In each of the following cases, carry out the calculations to determine the quantities required. a If 1.0 mol of potassium iodide reacts with 1.0 mol of lead(II) nitrate, determine which reactant is in excess and by how many moles. b If 0.50 mol of potassium iodide reacts with 2.0 mol of lead(II) nitrate, determine which reactant is in excess and by how many moles. c If 1.00 g of lead(II) nitrate reacts with 1.50 g of potassium iodide, determine which reactant is in excess and the mass of lead(II) iodide that forms. d If 50.0 mL of 1.00 M lead(II) nitrate solution reacts with 75.0 mL of 0.500 M potassium iodide solution, determine which reactant is in excess the mass of lead(II) iodide that forms

Answers

As a result, 0.231liters of the 0.150M potassium iodide solution would be required to thoroughly react with the supplied lead(II) nitrate solution.

What occurs when a solution of lead nitrate combines with a solution of potassium iodide?

When a solution of potassium iodide is introduced to a solution of lead nitrate in a test tube, a yellowish solid precipitates.

Lead iodide is a whitish solid. Along with lead iodide, potassium nitrate is generated. This is a reaction with two displacements.

The reaction between lead nitrate [Pb(NO3)2] and potassium iodide (Kl) results in the creation of potassium nitrate (KNO3) and a yellow precipitate of lead iodide (PbI2).

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consider the reaction zn (s) 2 hcl (aq) ---> zncl2 (aq) h2 (g) what volume (in milliliters)of 2.95 m hcl is needed to completely react with 2.70 g of zinc?

Answers

28.0 mL of 2.95 M HCl is needed to completely react with 2.70 g of zinc.

The balanced equation for the reaction between zinc and hydrochloric acid is: Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

We can use stoichiometry to determine the amount of hydrochloric acid needed to react with 2.70 g of zinc, and then convert the amount to volume using the molarity of the hydrochloric acid.

First, we need to determine the number of moles of zinc in 2.70 g:

moles of Zn = mass of Zn / molar mass of Zn

moles of Zn = 2.70 g / 65.38 g/mol

moles of Zn = 0.0413 mol

According to the balanced equation, 2 moles of HCl are required to react with 1 mole of Zn. Therefore, we need:

moles of HCl = 2 x moles of Zn

moles of HCl = 2 x 0.0413 mol

moles of HCl = 0.0826 mol

Now we can use the definition of molarity to find the volume of 2.95 M HCl needed:

Molarity = moles of solute / volume of solution (in liters)

Rearranging the equation gives

Volume of solution (in liters) = moles of solute / molarity

Volume of solution (in liters) = 0.0826 mol / 2.95 mol/L

Volume of solution (in liters) = 0.028 L

Finally, we can convert the volume from liters to milliliters:

Volume of solution (in milliliters) = 0.028 L x 1000 mL/L

Volume of solution (in milliliters) = 28.0 mL

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What is the average mass as measured by the data points?

Answers

The average mass, as measured by the given data points, is 15 grams.

To calculate the average mass from a set of data points, you need to sum up all the individual masses and divide by the total number of data points. Here's an example of how to calculate the average mass using a set of data points:

Let's say we have the following data points representing masses: 10 g, 15 g, 12 g, 18 g, and 20 g.

To calculate the average mass, we add up all the individual masses:

10 g + 15 g + 12 g + 18 g + 20 g = 75 g.

Next, we divide the sum by the total number of data points, which in this case is 5:

75 g / 5 = 15 g.

Therefore, the average mass, as measured by the given data points, is 15 grams.

Note that this is just an example calculation, and you can apply the same method to any set of data points to find the average mass.

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A newspaper started an online version of its paper 14 years ago. In a recent presentation to stockholders, the lead marketing executive stated, “The revenues for online ads are more than double that of the revenues for printed ads.”

Answers

Answer:

According to the graph, during year 14, revenue from online ads is approximately $4.2 million, while revenue from online ads has more than doubled revenue from printed ads (at least by year 14)

Both curves intersect between the seventh and eighth year, I would say around the middle of year 7, and both online ads and printed ads generated an approximate revenue of $2.2 million each

Explanation:

write the empirical formula for at least four ionic compounds that could be formed from the following ions: mno−4, fe2 , bro−3, nh 4

Answers

KMnO4; NaMnO4; LiMnO4

FeO ; FeCl2; FeS ; FeSO4

HBrO3; KBrO3; NaBrO3; LiBrO3

PbO2; PbS2; Pb(SO4)2; Pb(CO3)2

Ionic compounds are made up of charged particles called ions, which are created when an atom (or group of atoms) gains or loses an electron. An ion is classified as either positively or negatively charged depending on its charge.

What is an Emperical formula ?

Chemical formulas for compounds that simply specify the proportions of the elements they contain rather than the exact number or arrangement of atoms are known as empirical formulas. The element in the compound with the lowest whole number ratio would be this one.

An empirical formula is used to indicate the simplest whole-number ratio of the various atoms in a molecule. The molecular formula indicates the precise number of different atom kinds that are present in a compound's molecule.

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please help im failing

please help im failing

Answers

Answer:

the second one

Explanation:

because there are 3 of Na and one N

After anaerobic exercise, lactic acid is converted to pyruvic acid, which enters the ____________ pathway and can be used for energy

Answers

Answer:

body

Explanation:

because if latic acid is conveted to pyruvic acid.

A student shines a flashlight on a mirror.
What happens to the light?
O A. The light is reflected by the mirror.
OB. The light is absorbed by the mirror.
O C. The light travels around the mirror.
OD. The light travels through the mirror.

Answers

Answer:

a

Explanation:

mirrors reflect light

Answer:

a

Explanation:

if you try it you can see it reflex onto whatever is behind the mirror

The mass numbers for the elements in the periodic table.............as the atomic numbers.................. *

a. increase; decrease

b. increase; increase

c. decrease; decrease

d. decrease; increase​

Answers

Answer:

d

Explanation:

Plz help!

It takes a car going 40 mph 3 seconds to come to a stop. What is the acceleration?

Answers

X x. X xxx sxxdcssss
Cw
C
So s
We zx xx
Is the answer -13.3
Because acceleration is change in velocity divided by time

What is meant by the term,hydrolysis of a salt

Answers

Explanation:

Hydrolysis of salt is a reaction in which one of the ions from a salt reacts with water,forming either an acid or basic.

Salt hydrolysis is a reaction in which one of the ions from a salt reacts with water, forming either an acidic or basic solution. Salts that are derived from the neutralization of a weak acid by a strong base will always produce salt solutions that are basic.

HELP ME PLEASE!!!
One liter of water is cooled from 20°C to 3°C inside a refrigerator. What is the change in temperature in °F? K?

Answers

Answer:

Decrease of temperature by 62.6°F and 290.15°

Explanation:

First identify change in C: 17 degrees

now convert to Fahrenheit and Kelvin

Fahrenheit: 17 * (9/5) +32 = 62.6°

Kelvin: 17 + 273.15 = 290.15°

What happens during evaporation? A liquid changes to a gas. A liquid changes to a solid. A gas changes to a liquid. A solid changes to a liquid.

Answers

Answer:

A liquid changes to gas

Explanation:

"Evaporation is the process by which water changes from a liquid to a gas or vapor. Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapor."

Answer:

B

Explanation:

Giving the answer

the source of gases for the secondary atmosphere of the earth was _______

Answers

i believe the answer is volcano eruptions?

The source of gases for the secondary atmosphere of the earth was Volcanic Eruptions.

What is Secondary Atmosphere ?

The scientist think that the atmosphere today is completely different from what it used to be originally and therefore they call it secondary atmosphere.

Internal volcanic activity or the deposit of debris from comet collisions produce a secondary atmosphere. 

The secondary atmosphere is thought to have formed as a result of the numerous volcanic eruptions that occurred from the start of Earth's early periods.

Although each volcano is unique, they all emit gases such as H₂O, CO₂, SO₂, H₂S, HCl, N₂, NO₂, and others.

These gases are formed due to melting of the Earth's crust.

Volcanic activity  renew the atmosphere's molecules.

These molecules are not the Nitrogen and Oxygen that make up the atmosphere today.

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The engine operating at the conditions in Example Problem 2-3 has a combustion efficiency of 97%. Problem 2-3 Calculate: (a) Rate of unburned hydrocarbon fuel which is expelled into the exhaust system. [kg/hr] (b) Specific emissions of He. [(gm/kW-hr] (c) Emissions index of He A four-cylinder, 2.4-liter engine operates on a four-stroke cycle at 3200 RPM. The com-pression ratio is 9.4:1, the connecting rod length r Mary bought more than 72 pencils to distribute to children at an orphanage. She packs these pencils in gift boxes.If she packs 4 pencils each into x gift boxes, the inequality that represents this situation is .The simplified form of the inequality is Show that \( \vec{F}=\left(2 x y+z^{3}\right) i+x^{2} j+3 x z^{2} k \) is conservative, find its scalar potential and work done in moving an object in this field from \( (1,-2,1) \) to \( (3,1,4) \) S Can you describe what an algorithm does to someone new to coding? Explain In this political cartoon, showing Boss Tweed and his associates as vultures perched on a corpse representing New York, what do the bones and skulls most likely represent?A. Boss Tweed's defeated rivals within the Democratic Party B. Boss Tweed's defeated political opponents in the Republican PartyC. institutions and groups hurt by Boss Tweed's corrupt dealmakingD. corrupt institutions and groups that Boss Tweed aided At a concession stand, three hot dog(s) and two hamburger(s) cost $7.50, two hot dog(s) and three hamburger(s) cost $8.75. Find the cost of one hot dog and the cost of one hamburger Southern Colorado is more densely populated than the northern part of the state a child hears from parents and teachers that she is very smart. what would happen based on the mechanism of the self? a. suppose you obtain a chi-square statistic of 3.86. Are your results statistically significant if the critical value obtained from the distribution of chi-square is 6.63 with an Level of .01?b. What about with a chi-square statistic of 67.81. Are the results significant if a critical value of the distribution is 3.84 with level of .05? NO LINKS What controls circadian rhythms in humans? Explain how this process works. help me plzz 5 stars Describe sight in regards to sensory adaptation Two bottles and their labels are mathematically similar.The smaller bottle contains 0.512 litres of water and has a label with area 96 cm.The larger bottle contains 1 litre of water.Calculate the area of the larger label. Candace is interested in learning more about colors. Which question about colors could be answered through scientific investigation?Which color bends the most to make a rainbow?What color of scented marker has the best smell?Which flower has the prettiest shade of purple on its petals?What is the best-looking color on a high-performance sports car? An acid with pKa of 6 is placed into an environment where the PH is 2. Therefore, you can safely conclude that most of the acid molecules area.Adductedb.Ionizedc.Nonionizedd.Free radicals when you are surprised by an unexpected event, your cognitive labeling of that event will determine whether you feel one emotion or another (e.g., happy at a surprise party or scared by a burglar). this is theory of emotions. 1) Given a triangle ABC, such that: BC = 6 cm; ABC = 40 and ACB = 60. 1) Draw the triangle ABC. 2) Calculate the measure of the angle BAC. 3) The bisector of the angle BAC intersects [BC] in a point D. Show that ABD is an isosceles triangle. 4) Let M be the midpoint of the segment [AB]. Show that (MD) is the perpendicular bisector of the segment [AB]. 5) Let N be the orthogonal projection of D on (AC). Show that DM = DN. when a p = 720 w ideal (lossless) transformer is operated at full power with an rms input current of i1 = 3.5 a, it produces an rms output voltage of v2 = 8.2 v. Part (a) What is the input voltage, in volts? If two of the pairwise comparisons following an ANOVA exceedFishers LSD, how many would exceed Tukeys HSDA) One or noneB) TwoC) At least twoD) No more than two Find x in Parallelogram ABCD if B=76 and C= 10x+14PLEASE I NEED URGENT HELP NOW D: