Answer:
Explanation:
Magnesium when it oxidizes has a valence of 2.
Oxygen, when it mixes with something, has a valence of - 2
So Mg and O2 will form something, but what? The answer is MgO
Mg + O2 ===> MgO
To balance this equation, you need 2 Magnesiums on the right and 2 Oxygens also on the right. The left will need a two Magnesiums.
The balanced equation will be
2Mg + O2 ====> 2MgO
__C7H16+ ___O2=
CO2 + H20 how to balance this equation
Answer:
C7H16 + 11O2 = 7CO2 + 8H2O
Explanation:
Start by balancing the C and H in C7H16 by adding the coefficient of 7 for CO2 because there are 7 C's in C7H16. Similarly, since there are 16 H's in C7H16, balance it by adding the coefficient of 8 to the H2O, which will result in 16 H's.
Finally, add up the O's on the right side and balance it by adding the appropriate coefficient on the O2. On the right, there are 22 O's, so balance the equation by adding the coefficient of 11 on the left for the O2.
Describe how a polyploid is formed
Answer:
ExpPolyploidy is the heritable condition of possessing more than two complete sets of chromosomes. Polyploids are common among plants, as well as among certain groups of fish and amphibians. For instance, some salamanders, frogs, and leeches are polyploids. Many of these polyploid organisms are fit and well-adapted to their environments. In fact, recent findings in genome research indicate that many species that are currently diploid, including humans, were derived from polyploid ancestors (Van de Peer & Meyer, 2005). These species that have experienced ancient genome duplications and then genome reduction are referred to as paleopolyploids. This article discusses the mechanisms underlying polyploidy, and both the advantages and disadvantages of having multiple sets of chromosomes.
Mechanisms of Polyploidy
This diagram shows several pathways by which diploid species can transition to polyploid species and polyploid species can transition to diploid species. Each species is represented by an oval containing two or more colored circles. Each colored circle represents a complete set of chromosomes.
View Full-Size ImageFigure 1
Figure Detail
How does an organism become polyploid? Polyploids arise when a rare mitotic or meiotic catastrophe, such as nondisjunction, causes the formation of gametes that have a complete set of duplicate chromosomes. Diploid gametes are frequently formed in this way. When a diploid gamete fuses with a haploid gamete, a triploid zygote forms, although these triploids are generally unstable and can often be sterile. If a diploid gamete fuses with another diploid gamete, however, this gives rise to a tetraploid zygote, which is potentially stable. Many types of polyploids are found in nature, including tetraploids (four sets of chromosomes), hexaploids (six sets of chromosomes), and other chromosome-pair multiples
When 0.3 moles of acetylene is burned , total mole number of the products will be? a- 0.30 mol b-0.60 mol c-0.75 mol d-0.90 mol e- 1.2 mol
Answer:
d. 0.9 mol
Explanation:
On this case we have to start with the formula of acetylene:
[tex]C_2H_2[/tex]
Now we can write the chemical reaction of combustion:
[tex]C_2H_2~+~O_2~->~CO_2~+~H_2O[/tex]
The next step is to balance the reaction:
[tex]2C_2H_2~+~5O_2~->~4CO_2~+~2H_2O[/tex]
The molar ratio between [tex]C_2H_2[/tex] and [tex]CO_2[/tex] is 2:4, so:
[tex]0.3~mol~C_2_H_2\frac{4~mol~CO_2}{2~mol~C_2H_2}=0.6~mol~CO_2[/tex]
The molar ratio between [tex]C_2H_2[/tex] and [tex]H_2O[/tex] is 2:2, so:
[tex]0.3~mol~C_2_H_2\frac{2~mol~H_2O}{2~mol~C_2H_2}=0.3~mol~H_2O[/tex]
The total moles would 0.6 + 0.3=0.9 moles.
I hope it helps!
what will happen if we burn carbon monoxide In a closed room??
Answer:
the carbon monoxide will release blue fumes
The energy from 0.015 moles of octane was used to heat 250 grams of water. The temperature of the water rose from 293.0 K to 371.2 K. What is the enthalpy of combustion of octane? The specific heat capacity of water is 4.18 J/K g.
A. -5448 kJ/mol
B. 1226 kJ/mol
C. -1226 kJ/mol
D. 293.25 kJ/mol
Answer:
A.) -5448 kJ/mol
Explanation:
I got it correct on founders edtell
What is the definition of a scientific theory
A) A method of learning that emphasizes reason as the way to understand the world.
B) A brief statement that summarizes past observations and predicts future ones.
C) A model that explains the underlying reasons for observations and laws.
D) The equivalent of a scientific opinion which others may disagree with.
E) None of these.
Answer:
The correct answer to the following question will be Option C.
Explanation:
The theory seems to be the context within which findings are explained as well as possible predictions are made. This theoretical perspective discusses the factors behind the results as well as the laws.Theories have been used in scientific knowledge to give wide interpretations to accommodate observed facts in case the root reason is still yet to be found as well as characterized.So that Option C will be the right answer.
Which evidence would most strongly indicate that a chemical change is
taking place?
A. Fizzing
B. Changing shape
C. Breaking
D. Changing state
plsss answer this?? i need help
Answer:
85.34 g of oxygen
Explanation:
Carbon and Oxygen combine in ratio 3:8 to form CO2
Weight of C = 32g
3g of carbon reacts with 8g of oxygen
1g of carbon reacts with 8/3 g of oxygen
32 g of carbon reacts with 8/3 (32)
= 256/3
= 85.34 g of Oxygen
Hope it helps....
Attempt 1 of 1
Which of the following is most likely to have a crystalline structure?
wood
rubber
glass
quartz
Answer: Quartz
Explanation: I looked it up ;)
An aluminum can holds 350 mL of gas at 0 C and 1.0 atm. what is the new volume if the can is heated to 10 C and the pressure inside the can rises to 75 atm?
Answer:
Final volume of the gas is 4.837mL
Explanation:
Initial volume (V1) = 350mL = 0.35L
Initial temperature (T1) = 0°C = (0 + 273.15)k = 273.15k
Initial pressure (P1) = 1.0atm
Final volume (V2) = ?
Final temperature (T2) = 10°C = (10 + 273.15)k = 283.15K
Final pressure (P2) = 75atm
To solve this question, we'll have to use combined gas equation which is the combination of all gas law I.e Charle's laws, Boyle's law, Pressure law etc.
According to combined gas equation,
(P1 × V1) / T1 = (P2 × V2) / T2
Make V2 the subject of formula,
V2 = (P1 × V1 × T2) / (P2 × T1)
V2 = (1.0 × 0.35 × 283.15) / (75 × 273.15)
V2 = 99.1025 / 20,486.25
V2 = 0.004837L
V2 = 4.837mL
The final volume of the gas is 4.837mL
Answer:
4.84mL
Explanation:
Step 1:
Data obtained from the question. This include the following:
Initial volume (V1) = 350mL
Initial temperature (T1) = 0°C
Initial pressure (P1) = 1atm
Final temperature (T2) = 10°C
Final pressure (P2) = 75atm
Final volume (V2) =...?
Step 2:
Conversion of celsius temperature to Kelvin temperature.
This can be achieved by using the formula below:
T(K) = T (°C) + 273
Initial temperature (T1) = 0°C
Initial temperature (T1) = 0°C + 273 = 273K
Final temperature (T2) = 10°C
Final temperature (T2) = 10°C + 273 = 283K
Step 3:
Determination of the new volume.
The new volume can be obtained by using the general gas equation as follow:
P1V1/T1 = P2V2/T2
1 x 350/273 = 75 x V2/283
Cross multiply
273 x 75 x V2 = 1 x 350 x 283
Divide both side by 273 x 75
V2 = (1 x 350 x 283) / (273 x 75)
V2 = 4.84mL
Therefore, the new volume is 4.84mL
Which is one way that topographic maps are different from other maps?
Answer:
The answer is A. Unlike other maps, topographic maps indicate man-made and natural landforms.
Explanation: Took the test and got 100% Edg. 2020
Answer:
A)Unlike other maps, topographic maps indicate man-made and natural landforms.
Explanation:
And ironic bonds what happens to electrons? No
Answer:
metals donate electrons to nonsmetals
5.6 × 1012 / 3.5 × 109 = A × 10B
Answer:
B= 17649.28/A
Explanation:
If the atmospheric pressure in the laboratory is 1.2 atm, how many moles of gas were in each syringe? (Hint: Choose one volume and temperature pair from your data table to use in your ideal gas law calculation.)
Answer:
A: 2.525 x 10-4 mol
B: 2.583 x 10-4 mol
Explanation:
Part A:
Data Given:
. Temperature of water (H2O) = 21.3°C
Convert Temperature to Kelvin
T = °C + 273
T = 21.3 + 273 = 294.3 K
volume of (H2O) gaseous state = 5.1 mL
Convert mL to liter
1000 mL = 1L
5.1 ml = 5.1/1000 = 0.0051 L
Pressure = 1.2 atm
. no. of moles = ?
Solution
no. of moles can be calculated by using ideal gas formula
PV = nRT
Rearrange the equation for no. of moles
n=PV/RT......... (1)
where
P = pressure
V = Volume
T= Temperature
n = Number of moles
R = ideal gas constant
where
R = 0.08206 L.atm/ mol. K
Now put the value in formula (1) to calculate no. of moles of
n = 1.2 atm x 0.0051 L / 0.08206 L.atm.mol-1. K-1 x 294.3 K
n = 0.0061 atm.L / 24.162 L.atm.mol-1
n = 2.525 x 10-4 mol
no. of moles of gas (H2O) = 2.525 x 10-4 mol
Part B:
Data Given:
Temperature of water (H2) = 21.3°C
Convert Temperature to Kelvin
T = "C + 273
T= 21.3 + 273 = 294.3 K
volume of (H2) gas = 5.2 mL
Convert mL to liter
1000 mL = 1 L
5.2 ml = 5.2/1000 = 0.0052 L
Pressure = 1.2 atm
. no. of moles = ?
Solution
no. of moles can be calculated by using ideal gas formula
PV = nRT
Rearrange the equation for no. of moles
n= PV / RT......... (1)
where
P = pressure
V = Volume
T= Temperature
n = Number of moles
R = ideal gas constant
where
R = 0.08206 L.atm/mol. K
Now put the value in formula (1) to calculate no. of moles of
n = 1.2 atm x 0.0052 L/0.08206 L.atm.mol-1. K-1 x 294.3 K
n = 0.0062 atm.L/ 24.162 L.atm.mol-1
n = 2.583 x 10-4 mol
I
no. of moles of gas (H2) = 2.583 x 10-4 mol
What does the symbol (–Delta.Hfus) indicate in a phase change?
Answer:
changes from a solid to a liquid
Explanation:
C- A solid is being formed
Since the delta is negative, this indicates that a substance is transforming from a liquid state to a solid state. This best corresponds with C- A solid is being formed.
Why is John Dalton known as the originator of atomic theory?
Answer:
he thought of atoms first
Answer:
He was the first to be the one to propose that matter is made out of atoms. He also proved that the atoms are divisible in nature.
what is the difference between cells, tissues and organs
Answer:
A group of cells working together is defined as a tissue and several tissues working together comprise an organ.
Explanation:
Which of he following is a secondary alkanol?
a. CH3CH2CH2OH
b. CH3CH2CH2CH2OH
c. C(CH3)3OH
d. CH3CH(OH)CH3
Answer: Thus [tex]CH_3CH(OH)CH_3[/tex] is a secondary alkanol.
Explanation:
Alkanol are compounds which contains carbons bonded by single bonds and contains hydroxy (-OH) as functional group.
Primary alkanol are those compounds which contain hydroxyl group attached a carbon which is further attached to a single carbon atom. Example: [tex]CH_3CH_2CH_2OH[/tex] and [tex]CH_3CH_2CH_2CH_2OH[/tex]
Secondary alkanol are those compounds which contain hydroxyl group attached to a carbon which is further attached to two more carbon atoms.Example: [tex]CH_3CH(OH)CH_3[/tex]
Tertiary alkanol are those compounds which contain hydroxyl group attached to a carbon which is further attached to three more carbon atoms. Example: [tex]C(CH_3)_3OH[/tex]
Thus [tex]CH_3CH(OH)CH_3[/tex] is a secondary alkanol.
What is meant by “normal” when you are asked for normal boiling and melting points?
Answer:
Normal boiling point is the temperature at which a liquid boils at 1 atmosphere of pressure.
Explanation:
The ____ contains the highest concentration of ozone. (troposphere (exosphere ( stratosphere ( mesosphere
Answer:
the answer is stratosphere.
about 90% of ozone is found in the stratosphere.
Of the choices below, which one is not an ionic compound?
A) PCl5
B) MoCl6
C) RbCl
D) PbCl2
E) NaCl
Answer: [tex]PCl_5[/tex] is not an ionic compound.
Explanation:
An ionic compound is defined as the compound which is formed when electron gets transferred from one atom to another atom. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Thus [tex]MoCl_6[/tex], [tex]RbCl[/tex], [tex]PbCl_2[/tex] and [tex]NaCl[/tex] are all ionic compounds.
Covalent compound is defined as the compound which is formed by the sharing of electrons between the atoms forming a compound. These are usually formed when two non-metals react.
Thus [tex]PCl_5[/tex] is a covalent compound as both Phosphorous and chlorine are non metals.
PCl₅ is not an ionic compound. Ionic or electrovalent compounds are formed
through the transfer of electrons in a chemical reaction. Metals and non-
metals mostly form ionic compounds.
Covalent bonding on the other involves the sharing of electrons between
two elements. Non-metals are mostly involved in this type of reaction.
PCl₅ possesses a covalent bond and not ionic as electrons are shared
between two non metals which are phosphorus and chlorine.
Read more on https://brainly.com/question/957239
A(n) __________ can be added to milk to neutralize it.
What is the normal boiling point of of a solution containing 64.5g of non volatile quinoline ( MW 129 ) in 500 g of benzene when the normal boiling point is 80.10 and KB = 2.50
Answer:
THE NORMAL BOILING POINT OF A SOLUTION CONTAINING 64.5 g OF QUINOLINE IN 500 g OF BENZENE IS 82.6 C
Explanation:
Boiling point = old boiling point + molarity * boiling point constant (Kb)
First, you calculate the number of moles of quinoline in the solution
number of moles = mass / molar mass
Since the molar mass of quinoline has been given as 129 g/mol
number of moles = 64.5 g / 129 g/mol
number of moles = 0.5 moles.
Next is to determine the molarity:
molarity = number of moles of solute / kilogram of solvent
molarity = 0.5 moles / 500/1000 kg
molarity = 0.5 / 0.5
molarity = 1 M
The new boiling point can then be calculated using the formula:
B. P = old B.P + Kb * molarity
B.P = 80.10 + 2.50 * 1
B.P = 80.10 + 2.50
B.P = 82.6 degree celsius
Using a broom to clean sidewalks and driveways is a way to reduce water pollution.
Answer: Yes
Explanation:
Answer:
trueeeeee
Explanation:
Does the conductivity increase or decrease?
O It increases at first, then decreases.
O It continuously decreases
O It continuously increases
O lt decreases at first, then increases
Answer:
It continuously decreases.
Explanation:
the thermal motion makes the electrons to collide and disturb the free flow. Thus, conductivity is decreased.
find the volume of the prism iready help me please
Answer:
The answer is 80!
Explanation:
A prism is a three dimensional solid object in which the two ends are identical. It is the combination of the flat faces, identical bases and equal cross sections. The volume of the prism is 819 cm³.
What is the volume of the prism?A prism is a polyhedron with two parallel congruent faces called the bases that are polygons. The volume of a three dimensional solid is the amount of space it occupies. The volume is measured in cubic units. The volume can be denoted in m³, cm³, ft³, etc.
The volume of a prism is the area of the base times the height. The equation used to calculate the volume is:
Volume = Base area × Height
Here the rectangle has 9cm length and 7cm width. Then the area is:
Area = 9 × 7 = 63 cm²
The height of prism = 13 cm
Then the volume is:
V = 63 × 13 = 819 cm³
Thus the volume of the prism is 819 cm³.
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Your question is incomplete most probably your full question was
What is volume of the rectangular prism with length 9cm, width 7cm and height 13 cm?
Match each element to the correct description of its usual behavior in a chemical reaction.Silicon (Si)Argon (Ar)Sodium (Na)Will lose electrons
Answer:
Sodium (Na) — Will lose electrons
Silicon (Si) — Will lose electrons
Argon (Ar) — No reaction
Hope this helps.
Describe the differences seen in the properties of Boron and Nitrogen.
Answer:
Explanation:
As you move from left to right in periodic table the size of atom size decreases, electrongeativity increases.
it mean
Boron is bigger in size than Nitrogen
Boron is less electroneagive than Nitrogen.
can you find simialr to this another factor to realte
is bleached water safe for drinking???
Answer:
NO most of the time
Explanation:
I hope this is for school and not personal reasons. Bleach will kill you if drank plain, if it's diluted a little it may not be fatal but can still greatly harm your organs. If it is diluted extremely it is used for cleaning tap water and is perfectly fine.
Just to be on the safe side, I want you to know there is always help, and if you need someone to talk or text this is the number for the National Su1c1de Hotline and it is free and available if you are ever feeling like self harm is the only way out:
800 273 8255
Describe one way in which uranium is disposed of.
Answer:
In the oxide form, uranium can be disposed of as low-level radioactive waste at an approved disposal facility. Approximately 350,000 tons of anhydrous HF are used annually in the United States.
Explanation: