CH4 + 2O2 --> CO2 + 2H2O
On the reactant side you start with 1 carbon, 4 hydrogen, and 2 oxygen. On the product side you start with 1 carbon, 2 hydrogen, and 3 oxygen. In order to get them equal, you need to put 2 in front of the H2O which equals out the number of Hydrogen on both sides. But Now we must balance the Oxygens. Because of the H2O we now have 4 Oxygens on the product side and only 2 on the reactant. In order to balance this, we put a 2 in front of the O2 giving us 4 hydrogen on both sides, Balancing the equation
Can someone answer the bottom question (22-25)
What is the number of electrons in the outermost energy level of an oxygen atom?
Answer:
6 electrons.
Explanation:
An atom of oxygen has six electrons in its outermost energy level, and these are called valence electrons.
An object was measured by a worker as 35.6cm long, however, the manufacturer specifications list the length of the object at 35.0cm. What is the percent error In the workers measurement?
Answer:
----1.71%----
Calculate the ratio of H+ ions to OH– ions at a pH = 6. Find the concentration of H+ ions to OH– ions listed in Table B of your Student Guide. Then divide the H+ concentration by the OH– concentration. Record this calculated ratio in Table A of your Student Guide.
Compare your approximated and calculated ratios of H+ ions to OH– ions at a pH = 6. Are they the same? Why or why not? Record your explanation in Table A.
What is the concentration of H+ ions at a pH = 6?
What is the concentration of OH– ions at a pH = 6?
What is the ratio of H+ ions to OH– ions at a pH = 6?
The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Therefore, the pH of 1.0 x 10⁻³ M of solution is 7.002. pH is a unitless quantity. Therefore, the ratio between [H+] and [OH⁻] is 100:1.
What is pH?pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.
pH =-log [H+]
Substituting the given values, in above equation, we get
6 =-log [H+]
[H+]= 0.000001
[H⁺]x[OH⁻] = 10⁻¹⁴
0.000001x[OH⁻] = 10⁻¹⁴
[OH⁻] =0.00000001
ratio= [H+]/[OH⁻]
= 0.000001/0.00000001
=100:1
Therefore, the ratio between [H+] and [OH⁻] is 100:1.
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Which best compares freezing and condensation?
Both involve changes between liquids and gases.
Both involve changes between gases and solids.
Both involve the release of heat.
Both involve the absorption of heat.
According to the forces of attraction, the statement which best compares freezing and condensation is that both involve the release of heat.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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The mass on the periodic table is called
Show work
7. How many mm are there in 2.3Mm?
8. Copper has a density of 6.55g/cmº. A. piece of metal has a mass of 48.3g and a volume of 7.2cm.
Is this metal copper?
9. What is the mass of a liquid whose volume is 6.0 mL and a density of 1.3 g/cm??
10. You have 3.50 L of a liquid, whose density is 2.3g/cm3. What is it's Mass?
Answer:
7 = 2.3× 10⁺⁹ mm
8 = The density of copper is 6.55g/cm³ so the given metal is not copper.
9 = mass of liquid is 7.8 g
10 = mass of liquid is 8050 g.
Explanation:
7. How many mm are there in 2.3Mm?
mm is the symbol of millimeter.
Mm is the symbol of megameter.
1 mm = 10⁻⁹Mm
so in order to convert 2.3Mm into mm we will multiply the given value with 10⁺⁹
2.3 mm × 10⁺⁹ = 2.3× 10⁺⁹ mm
8. Copper has a density of 6.55g/cmº. A. piece of metal has a mass of 48.3g and a volume of 7.2cm.
Is this metal copper?
Given data:
Density of copper = 6.55 g/cm³
Mass of metal = 48.3 g
Volume of metal = 7.2 cm³
Is the metal is copper = ?
Solution:
The given problem will be solved through the density formula.
D = m/v
We will put the values in formula to calculate the density.
d = 48.3 g/ 7.2 cm³
d = 6.71 g/cm³
The density of copper is 6.55g/cm³ so the given metal is not copper.
9. What is the mass of a liquid whose volume is 6.0 mL and a density of 1.3 g/cm??
Given data:
Volume of liquid = 6.0 mL (1 mL = 1cm³)
Density of liquid = 1.3 g/cm³
Mass of liquid = ?
Solution:
Formula:
D = m/v
By putting the values in formula.
1.3 g/cm³ = m / 6 cm³
m = 1.3 g/cm³ × 6 cm³
m = 7.8 g
mass of liquid is 7.8 g.
10. You have 3.50 L of a liquid, whose density is 2.3g/cm3. What is it's Mass?
Given data:
Volume of liquid = 3.50L (3.50 ×1000 = 3500 cm³)
Density of liquid = 2.3g/cm³
Mass of liquid = ?
Solution:
Formula:
D = m/v
By putting the values in formula.
2.3g/cm³ = m /3500cm³
m = 2.3 g/cm³ × 3500 cm³
m = 8050 g
mass of liquid is 8050g.
An atom's Lewis dot structure has two dots. Which of the following elements could it be, and why?
A)Calcium, because it is an alkaline earth metal with two inner shell electrons. B)Carbon, because it has two electrons in its outermost p sub level.
C)Lithium, because it is a group 1 element with two bonding electrons. D)Magnesium, because it is a group 2 element with two valence electrons.
Answer:
The answer is D, Magnesium.
Please help me with this question
Answer:
it absorbed it
Explanation:
it going up shows that it absorbed thermal energy because that's the temperature. when temperature goes up thermal energy comes in
A pool holds 20,000 liters of water. How many milliliters is this?
Answer:
2000000
Explanation:
Answer:
20,000,000
Explanation:
What is the density of an object with a mass of 57.8g and a volume of 112.4mL?
Answer:
D=m/v
D=57.8/112.4
D=0.51423487544 g/mL^2
Explanation:
The density of an object with a mass of 57.8 g and volume of 112.4 mL is 514.23 mg/m L.
What do you mean by density?Density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume.
Density is commonly expressed in units of grams per cubic centimeter.
Density can also be expressed as kilograms per cubic metre .
To calculate the density of an object ,
Given,
Mass=57.8 g(57.8×1000=57800mG) convert grams into milligrams
Volume=112.4mL
We know ,
Density =mass/volume
=514.23mG/mL
The density of an object with a mass of 57.8g and volume of 112.4 mL is 514.23 mg/m L.
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5. Common (most stable) mass numbers of the following elements are Al-27, Pt-195, Co-59,
Ag-108, and Au-197 respectively. Shorthand notation is written with a mass number on the
top and atomic number on the bottom of the element symbol. Check letters a-d in 4 above
and use those as examples to write the shorthand notation of the following elements and
determine the number of neutrons in each element.
Aluminum
Platinum
Cobalt
Silver
Gold
Answer:
Number of neutrons of Al²⁷₁₃ = 14
Number of neutrons of Pt¹⁹⁵₇₈= 117
Number of neutrons of Co⁵⁹₂₇= 32
Number of neutrons of Ag¹⁰⁸₄₇= 61
Number of neutrons of Au¹⁹⁷₇₉ = 118
Explanation:
We know that atomic number of an atom is number of electron or protons while atomic mass is sum o number of neutrons and and protons.
Shorthand notations of given elements:
Al²⁷₁₃
This notation shows that atomic number of Al-27 is 13 and atomic mass is 27.
Number of neutrons of Al²⁷₁₃ = 27 - 13
Number of neutrons of Al²⁷₁₃ = 14
Pt¹⁹⁵₇₈
This notation shows that atomic number of Pt-195 is 78 and atomic mass is 195.
Number of neutrons of Pt¹⁹⁵₇₈ = 195 - 78
Number of neutrons of Pt¹⁹⁵₇₈= 117
Co⁵⁹₂₇
This notation shows that atomic number of Co-59 is 27 and atomic mass is 59.
Number of neutrons of Co⁵⁹₂₇ = 59 - 27
Number of neutrons of Co⁵⁹₂₇= 32
Ag¹⁰⁸₄₇
This notation shows that atomic number of Ag-108 is 47 and atomic mass is 108.
Number of neutrons of Ag¹⁰⁸₄₇ = 108 - 47
Number of neutrons of Ag¹⁰⁸₄₇= 61
Au¹⁹⁷₇₉
This notation shows that atomic number of Au-197 is 79 and atomic mass is 197.
Number of neutrons of Au¹⁹⁷₇₉ = 197 - 79
Number of neutrons of Au¹⁹⁷₇₉ = 118
PRACTICE
1. The mathematical statemel, 2 + 2 = 4, is a fact. Imagine you have a bunch of apples. How could you use the
apples to prove this statement is a fact?
Answer:
If you take 4 apples and divide them by 2 there will be 2 apples in each set so if you add both sets of apples which is 2+2 there would be 4 apples
You come across a thick deposit of shale that forms a layer in the ground. What can you infer about the area's past environment?
A. It was near a volcano, because shale forms when lava cools quickly and hardens.
B. It was covered by water, because shale forms when water deposits clay particles.
C. It was underground in a volcanic area, because shale forms when magma cools slowly and hardens.
D. It was covered by water, because shale forms when water evaporates and deposits the dissolved clay.
A tapeworm attaches to the wall of its host’s intestine and starts to absorb the host’s nutrients. Eventually this can cause great harm to the host as the host loses many important nutrients.
Which type of infectious agent is a tapeworm?
a virus
a bacterium
a fungus
a parasite
Answer:
A parasite.
Explanation:
A virus usually invades cells and replicates.
A bacteria usually just replicates and either is beneficial or can harm.
A fungus usually decomposes or can make you sick.
A parasite usually is parasitism - it invades the organisms and leeches off them for shelter and nutrients and can harm.
Answer:
A parasite.
Explanation:
i got it right
What does the illustrated symbol on the element key mean?
Answer: Each element has a symbol,one or two letters that represent the element much as your initials represent you. The symbol of an element represents one atom of that element. For 14 of the elements, the symbol consists of one letter.
Explanation:
compared to the sun , all of the stars that can be observed in the night sky are?
Answer:
small- even though they are huge suns themselves.
Explanation:
A jet engine might use _____.
rapid combustion
respiration
slow combustion
nitrous oxide
Answer:
A jet engine might use rapid combustion.
Hope this helps!
Have a great day! :))))
I know this because i had this on a test yesterday and got it right.
A box has a mass of 5 kg. What is the weight of the box on Earth?
Show your work. (Hint: What is the pull of gravity on an object at Earth's surface?)
Answer:
Given that W=mg:
The weight of the box would be 50 N taking the value of 'g' as 10ms-2. Taking the value of 'g' as 9.8ms-2, the weight of the box would be 49 N.
(N = Newtons)
Carbon-12 and carbon-14 are isotopes of carbon. Scientists can compare the ratio of
carbon-14 to carbon-12 within an organic object to determine its age. How are isotopes
different from one another?
They have different numbers of neutrons.
They have different numbers of valence electrons.
They have different chemical properties.
They have different numbers of protons.
Answer:
I'm pretty sure the answer is B.
Explanation:
I hope this helps
Isotopes are different from one another as they have different numbers of neutrons.
What are isotopes?
Isotopes are defined as substances having same number of protons but different number of neutrons.Number of protons is characteristic for determining position of elements in the periodic table.
Since,all isotopes have the same number of protons and hence have same position.They have similar chemical properties as they have same number of electrons.
They find applications in the field of nuclear medicine and oil and gas research . There are 2 types of isotopes : stable and unstable
Unstable isotopes are radioactive and are called as radioisotopes.Some of these isotopes are man -made and hence also called as artificial isotopes.Every element has an isotope which is either man-made or natural .
Many properties of isotopes depend on mass which is measured in atomic mass unit. The difference in actual mass and mass number is called mass defect.
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Review the desert food web above. What organism, absent in the web, would be MOST responsible for recycling organic matter back through the food web?
A) cougars
B) bacteria
C) sage brush
D) cactus plants
HELPP PLEASEEEEEEE ITS PROBS EASY FOR YOU GUYS
Answer:
ik that energy makes us movie and that it powers lights and electronics
kinetic energy ,chemical energy ,potential energy ,and thermal energy
the law of conservation of energy states that the total energy of an isolated system remains constant
Explanation:
hope it helpss
The bond between iodine and fluorine in l-F would be a:
O
a
Ob
ес
james bond
nonpolar covalent bond
ionic bond
o d
polar covalent bond
Answer:
D.) polar covalent bond
Who's model was titted the atomic theory of matter"? *
Answer:
John Dalton
Explanation:
Answer:
John Dalton, an English chemist, inferred that atoms had certain characteristics. He began to propose an atomic the- ory and model for atoms. The main ideas of Dalton's theory are summarized in Figure 2. With only a few changes, Dalton's atomic theory is still accepted today.
Explanation:
Can a single atom be considered a molecule?
Answer: no
Explanation:
Answer: yes it can
Explanation: hope it help
The atoms of compounds are _____________ combined in some way. Often times they come together to form groups of atoms called molecules.
Answer:
Chemically
Explanation:
Because chemical bonds form between the atoms.
PLEASE HELP I ONLY HAVE 5 MINS LEFTTTT
You want to get more physically fit but often make excuses for why you don't have time to be active. What strategy can help with this problem? (3 points)
a
Find an activity you enjoy and make it a priority in your schedule
b
Wait to exercise until you are in the mood so you won't make excuses
c
Cut back on calories on days you are not motivated to be physically active
d
Only exercise at the end of the day so you are consistent every day
Answer: A
Explanation:
Answer choices B and C both involve some form of procrastination. In the question it states what is the BEST strategy and I think that that would be doing something you like to do so you don’t make excuses to not do it.
Answer:
a
Explanation:
its the only reasonable one
An atom has 11 protons, 12 neutrons, and 11 electrons. What is the identity of the element?
Answer:
It's a Sodium Atom
how many sig figs are there? 306.2
Answer:
There are four significant figures in given measurement.
Explanation:
Significant figures:
All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
Zero between the non zero digits are consider significant like 104 consist of three significant figures.
The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.
In given measurement 306.2 there are 4 significant figures.
3,0,6,2
All digits are significant.
6. How are the frequency and wavelength of light related?
O Wavelength is determined by dividing frequency by the speed of light.
O They are inversely proportional to each other.
O They are directly proportional to each other.
O Frequency equals wavelength divided by the speed of light.
Answer:
Option B is correct = They are inversely proportional to each other.
Explanation:
Frequency and wavelength of lights are inversely proportional to each other.
The wave of light having highest frequency have shortest wavelength and the light with the shortest frequency having highest wavelength.
Formula:
Speed of light = wavelength × frequency
c = λ × f
λ = c/f
This formula shows that both are inversely related to each other.
The speed of light is 3×10⁸ m/s
Frequency is taken in Hz.
It is the number of oscillations, wave of light make in one second.
Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.
Option A is incorrect:
Because wavelength is determine by dividing speed of light by frequency.
Option C is incorrect:
Because wavelength and frequency are not directly proportional to each other.
Option D is incorrect:
Because frequency is equal to the speed of light divided by wavelength.
Answer: it’s B or the second option
Explanation:
