Answer:
During a total lunar eclipse, the Earth lies directly between the sun and the moon, causing the Earth to cast its shadow on the moon.
Explanation:
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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When combined, two gases have a pressure of 75.54 atm. If one has has a pressure of 2.90 atm, what is the pressure of the second gas?
Your answer must me rounded to the second decimal place. (Dalton's)
Answer:
The pressureof the secondone is 2.5 atm
Explanation:
hope this helps
brainley.
How is Earths crust recycled?
I think it's the last one
(and I'm so sorry if I'm wrong)
Answer:
The answer is D
Explanation:
The rest of them are not cycles.
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:
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.
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.
HELLP: WHAT IS THE 10 ORGANIZATIONS OF MATTER???
WILL GIVE BRAINLEST
molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.
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:
A cell is placed in a salt solution that has the same concentration as the inside of the cell. What will happen to the cell?
A) The cell will contract.
B) The cell will expand slightly.
C) The cell will burst.
D) The cell will remain the same size.
Answer:
d
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
What is the correct IUPAC name for the acid: H2Lv
The maximum water vapor that air can hold at 30°C is about 30 grams/cubic meter. If the humidity of the air is currently 6 grams/cubic meter at the same temperature, the relative humidity is
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
What is the relationship between electrons and elements with
negative oxidation numbers? between electrons and elements
with positive oxidation numbers?
Explanation:
The higher its electronegativity, the more an element attracts electrons. The atom with higher electronegativity, typically a nonmetallic element, is assigned a negative oxidation number, while metallic elements are typically assigned positive oxidation numbers.... Hope it is useful brainliest plz if it was useful....
The relationship between electrons and oxidation number has bee the negative oxidation number implies the gain of the electron, while positive oxidation number implies the loss of electron by elements.
The oxidation number has been defined as the number of electrons lost or gained by an element to form a chemical bond. The elements that lose electrons are assigned positive oxidation number.
The elements that gain electrons to form a chemical bond are assigned a negative oxidation number.
The relationship between electrons and oxidation number has bee the negative oxidation number implies the gain of the electron, while positive oxidation number implies the loss of electron by elements.
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Identify the reactant(s) in the chemical reaction, CO2 + H20 --> H2CO3. *
A. CO2, H20, and H2CO3
B. CO2 and H20
C. H2CO3
Answer:
The correct answer is B. From the chemical reaction, the reactants are carbon dioxide and water. Reactants are the substances that take part in the chemical reaction which, as a result, produces new substances called the products
Explanation:
Hope it helps
What is the oxidation number for Mn in the following compound?
Mn(NO₃)₄
true or false : Color Changes are used to show reaction completion
Answer:
True
Explanation:
It means the reaction is occuring.
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.
Look at this glass of soda. Use your knowledge of thermal energy transfer to explain how heat is affecting the following things: ice, soda, glass, and surrounding air.
Explanation:
Technically, the ice cube melts because the water cools down. This may sound ridiculous at first, but you must consider the fact that the ice melts because it has drawn "heat" (energy) from its surroundings. The "surroundings" being the air and water that surround it (but the water's more important since it's a better conductor of thermal energy).
The surrounding air looses energy while the ice in the glass gains energy.
We know that thermal energy is transferred from a hotter body to a cooler body. If we look as the glass, we will notice that the surrounding air has a greater energy compared to the contents of the glass. The surrounding air looses this energy resulting in the condensation of water vapor in air around the glass.
Similarly, the ice in the glass gains energy and melts. A change of state occurs from solid to liquid as a result of the energy absorbed from the surrounding air.
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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
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
What statements are true about mutations to DNA?
Answer:
Is this a general question or is there supposed to be a picture
Explanation:
how does pentene become pentane?
How does propene become propane?
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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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
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 do you need to know
Select the most likely product for this reaction:
Upper K subscript 2 upper C upper O subscript 3 (a q) plus upper C upper O subscript 2 (g) right arrow question mark.
K2CO3(aq) + H2O(l)
K(s) + H2(g) + O2(g)
K(s) + CO3(g) + H2
Answer:
The answer is A- K2CO3(aq)+H2O(I)
Explanation:
The person who made this question gave the answer so...eh??
Answer:
A) K2CO3(aq) + H2O(l)
Explanation: