Answer:
cupro - nickel
if u on its weight its 9.00gms and diameter:23mm
Answer:
Silver
Explanation:
Because when white metal has an illustrious reputation for its use on jewelry and coins, but today, silvers primary use is industrial.
Giving brainliest! Please help pleaseeee
Answer:
Id want to know how the nucleus looks like upclose, is it really that neutrons and protons are bond together, or are they just sticking in together. I'd also wanna look at electrons, or even possible hold them so that i can see the mass it really has
Explanation:
One mol of air contains 0.74 moles of nitrogen gas and 0.25 mol of oxygen gas. Compute the partial pressure of these gases at a total pressure of 1.7 atm and at a total pressure of 4.7 atm.
Explanation:
Partial pressure of a gas is the product of the mole fraction of that gas, which is the ratio of the no. of moles of the gas to the total no. of moles, and the total pressure.
total no. of moles=0.74+0.25=0.99 mol
mole fraction of N2=0.74/0.99=0.7475
mole fraction of O2=0.25/0.99=0.2525
total pressure=1.7+4.7=6.4 atm
partial pressure of N2=0.7475×6.4=4.784 atm
partial pressure of O2=0.2525×6.4=1.616 atm
500.0 mL of a gas is collected at 745.0 mmHg. What will the
volume be at 760 mmHg?
Answer:
490 ml
Explanation:
what is the formula of the compounds in B
pls help
Answer:
PCl3
Explanation:
The molecular formular of a compound shows the exact number of atoms of elements present in the compound. In this illustration, there is one atom of P and 3 atoms of Cl.
The formular is given as; PCl3
Answer:
PCl³
Explanation:
because there are 1 phosphorus atom and 2 chlorine atom.
what do you need to know
What statements are true about mutations to DNA?
Answer:
Is this a general question or is there supposed to be a picture
Explanation:
Fill in the two blanks
Answer:
A.) Longer and Shorter
Explanation:
If the wavelength of a light wave is shorter that means the frequency will be higher.
That means that longer wavelengths have a lower frequency.
Calculate the volume of 12.0 g of helium at 100° C and 1.2 atm.
Answer:
the answer I think is 76.5L
The partial pressures of CH4, N2, and O2 in a sample of gas were found to be 248 mm Hg, 707 mm Hg, and 518 mm Hg, respectively. What is the mole fraction of Nitrogen gas?
total pressure=248+707+518=1473mmHg
partial pressure=total pressure×mole fraction
mole fraction of N2
=partial pressure of N2/total pressure
=707mmHg/1473mmHg
=0.4800
28g of aluminum reacts with 45g oxygen
1) complete balanced equation?
2) what is the limiting reactant?
3) how many grams of product could be formed?
4) how many grams of excess would you predict?
5) if you actually measured 50g of product, what is the percent yield?
Answer:
answer below:
Explanation:
1) 4 Al + 3 O2 --> 2Al2O3.
2) Al mol= 28/27 = 1.037mol
O mol= 45/16 = 2.812mol
Al : O
4 : 2
x : 2.812
cross multiply
4 x 2.812/2 = 5.624 mol of Al
Al is limiting reactant
3) 28/5.246 = 5.34product can be formed (not that much sure)
4) 45/ 0.5185 = 86.79
86.79 - 5.34 = 81.45g
5) 50 / 81.45 x 100 = 61.39% ( i guess)
i hope this hleps you
which bond type involves the sharing of valence electrons?
NEED HELP ASAP PLEASE!!!!
Answer:
Covalent Bond
Explanation:
A covalent bond involves electrons being shared between atoms. The most stable state for an atom occurs when its valence electron shell is full, so atoms form covalent bonds, sharing their valence electrons, so that they achieve a more stable state by filling their valence electron shell.
Explain how trait are governed by the genetic material found in the genes within chromosomes in the cell nucleus.
Answer:
Genes determine which phenotypes you get
Explanation:
When you have a gene, it determines what proteins get bonded together. Such as eye color, hair color, hair type, etc.
Genes are the elements that influence traits. Alleles are the many varieties of a gene. Trait inheritance is controlled by individual alleles. While some alleles are recessive, others are dominant.
What are genes ?The term "gene" can be interpreted in a number of ways. The molecular gene is a sequence of nucleotides in DNA that is transcribed to form a functional RNA, whereas the Mendelian gene is the fundamental unit of inheritance. Protein-coding genes and noncoding genes are the two categories of molecular genes.
Chromosomes, which are found in the cell nucleus, are where genes are found. There are hundreds to thousands of genes on each chromosome. There are 46 chromosomes in all, or 23 pairs, in each typical human cell.
Some features are controlled by genes that are passed down from parents to their children, while others are learned via observation and experience, and the majority are influenced by genetics.
Thus, Alleles are the many varieties of a gene.
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eye is an organ why????
Answer:
The eye is an organ that detects light and sends signals along the optic nerve to the brain.
Explanation:
In humans, the eye is a valuable sense organ that gives us the ability to see. It allows for light perception and vision, including the ability to differentiate between colors and depth.Although small in size, the eye is a very complex organ. The eye is approximately 1 inch wide, 1 inch deep and 0.9 inches tall. The human eye has a 200-degree viewing angle and can see 10 million colors and shades. Humans have two eyes which allows us to have better depth perception and binocular stereopsis.
Hope this helps
What is the difference between a pure solvent and a solution? Do they have the same physical properties?
Answer:
The physical properties of a solution are different from those of the pure solvent. ... Colligative properties are those physical properties of solutions of nonvolatile solutes that depend only on the number of particles present in a given amount of solution, not on the nature of those particles.
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Pls help me with this problem
Answer:
B
Explanation:
The triple point is the temperature and pressure in which the three states or phases of a matter coexist with one another.
For example, the triple point of pure water is 0.01°C and 4.5mmHg
Landscapes all over the world change due to:
1) Wind
2) Erosion
3) Water
Answer:
Erosion
Explanation:
Wind and water change landscapes by erosion.
Name this alkane.
A five-sided polygon with one point facing left. A straight line extends from that point, then a line slanting up to the left, then another straight line extends left.
propylcyclopentane
pentylpropane
nonacyclotane
phenylcyclopentane
Answer:
propylcyclopentane
Explanation:
The rest Are swiggly lines and more than 5 sides
The organic compounds which consist of single bonded carbon and hydrogen atoms are called alkanes. They are also called the saturated hydrocarbons. Here the given alkane is propylcyclopentane. The correct option is A.
What is propylcyclopentane?The propylcyclopentane is an alkane which is the simplest family of hydrocarbons. It is a cyclic hydrocarbon which acts as the major component of gasoline and it is also used in the manufacture of synthetic resins and rubber adhesives.
The propylcyclopentane is an important cycloalkane which contains five carbon atoms bonded to two hydrogen atoms above and below the plane. It appears as a clear colourless liquid with a petroleum like odor. It is less dense than water and it is insoluble in water.
Propylcyclopentane is a member of cyclopentanes, a cycloalkane and a volatile organic compound. Its molecular formula is C₈H₁₆. It can also be called as 1 - Cyclopentylpropane.
Thus the correct option is A.
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how does pentene become pentane?
How does propene become propane?
When the equation H2 + Fe3O4 = Fe + H2O is completely balanced using the smallest whole numbers, the coefficient oH2 would be A.) 1 B.)2 C.) 3 D.) 4
Answer:
H2 would have a coefficient of 2.
Explanation:
According to the balanced chemical equation, the coefficient of hydrogen is 4.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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What causes dipole interactions?
bonding of a covalently bonded hydrogen to an unshared electron pair
attraction between ions
attraction between polar molecules
sharing of electron pairs
What is the number of moles of H2 produced when 23 g of sodium react with water according to the equation 2Na(s) + 2H2O(l) 2NaOH(aq) + H2(g)
Answer:
0.5 mole of H₂.
Explanation:
We'll begin by calculating the number of mole in 23 g of Na. This can be obtained as follow:
Mass of Na = 23 g
Molar mass of Na = 23 g/mol
Mole of Na =?
Mole = mass / Molar mass
Mole of Na = 23 / 23
Mole of Na = 1 mole
Next, the balanced equation for the reaction.
2Na + 2H₂O —> 2NaOH + H₂
From the balanced equation above,
2 moles of Na reacted to produce 1 mole H₂.
Finally, we shall determine the number of mole of H₂ produced by the reaction of 23 g (i.e 1 mole) of Na. This can be obtained as follow:
From the balanced equation above,
2 moles of Na reacted to produce 1 mole H₂.
Therefore, 1 mole of Na will react to produce = (1 × 1) / 2 = 0.5 mole of H₂.
Thus, 0.5 mole of H₂ is obtained from the reaction.
What is the oxidation number for Mn in the following compound?
Mn(NO₃)₄
i really need these solved, it’s asking for half equations!!
Answer:
Net equation: Cu + 2Ag+ ⇒ 2Ag + Cu2+
Explanation:
Cu + 2N03- + 2Ag+ ⇒ 2Ag + 2NO3- + Cu2+
The 2NO3- cancel out since they're spectator ions
∴ Cu + 2Ag+ ⇒ 2Ag + Cu2+
Half equations are:
Cu ⇒ Cu2+
2Ag+ ⇒ 2Ag
Balancing both sides of each equation with electrons will lead back to the Net equation.
What is the correct IUPAC name for the acid: H2Lv
OMG PLEASE HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP MEEEEEEEEEEEEEEEEEEEEEEEEEE
in which of the following is number of neutrons correctly represented?
Answer:
²³⁸₉₂U has 146 neutrons
Explanation:
To know which option is correct, we shall determine the number of neutrons in each case. This can be obtained as follow:
For ²⁴₁₂Mg:
Mass number (A) = 24
Proton number (P) = 12
Neutron number (N) =?
A = P + N
24 = 12 + N
Collect like terms
N = 24 – 12
N = 12
Thus, there are 12 neutrons in ²⁴₁₂Mg
For ⁷⁵₃₃As:
Mass number (A) = 75
Proton number (P) = 33
Neutron number (N) =?
A = P + N
75 = 33 + N
Collect like terms
N = 75 – 33
N = 42
Thus, there are 42 neutrons in ⁷⁵₃₃As
For ¹⁹₉F:
Mass number (A) = 19
Proton number (P) = 9
Neutron number (N) =?
A = P + N
19 = 9 + N
Collect like terms
N = 19 – 9
N = 10
Thus, there are 10 neutrons in ¹⁹₉F.
For ²³⁸₉₂U:
Mass number (A) = 238
Proton number (P) = 92
Neutron number (N) =?
A = P + N
238 = 92 + N
Collect like terms
N = 238 – 92
N = 146
Thus, there are 146 neutrons in ²³⁸₉₂U
Considering the options and the illustration made above, Only ²³⁸₉₂U has the correct number of neutrons written along side.
A person who controls access to the decision maker is called a(n)
Answer:
Wdym?
Explanation:
I don't understand this question
Answer:
gatekeeper
Explanation:
An organism from the past that is related to all the organisms in the group is called?
Answer:
phylogenic trees/phylogeny
Explanation:
the evolutionary history and relationship of an organism or group of organisms is called its phylogeny
Why does it seem that the sun is rising and setting in the sky?
Answer:
Because of the earths rotation
Explanation:
But it appears to rise and set because of the Earth's rotation on its axis. It makes one complete turn every 24 hours. ... As the Earth rotates toward the east, it looks like the sun is moving west. As the Earth rotates, different locations on Earth pass through the sun's light.
Answer:
When the earth is rotating, it is rotating away and towards the sun which is why we have day and night
Explanation:
How many moles are in 5.30 X 1023 molecules of H2O?
Answer:
0.880 (0.88039867109 to be exact)
Explanation:
To convert from molecules to moles, simply divide by Avogadro's number which is 6.02 x 10^23
So, 5.30x10^23/6.02x10^23 = 0.880