does the moon really change shape? why
TRUE or FALSE: The only way to see a recessive trait is to inherit 2 recessive
alleles.
Answer:
false it's more than two
How many moles of nitrogen are required to produce 13.5 grams of NH3
Answer:
0.794 moles
Explanation:
Gviven that:
TO find the number of moles of nitrogen (N) using the formula:
number of moles = mass /molar mass
where;
the molar mass for NH3 = 14 +( 1 × 3) = 17 g/mol
∴
number of moles of (N) = mass of N/molar mass
= 13.5 g/17 g/mol
number of moles of (N) = 0.794 moles
The total pressure in a tank is filled with a mixture of gases : Oxygen, Helium, and Argon is 15.3 atm. The P(He) = 3.2 atm, P(O) = 7.4 atm, what is the P(Ar) in the tank?
Answer:
4.7 atm
Explanation:
From the question given above, the following data were obtained:
Total pressure (P) = 15.3 atm
Pressure of Helium, P(He) = 3.2 atm
Pressure of Oxygen, P(O) = 7.4 atm
Pressure of Argon, P(Ar) =?
The pressure of Argon, P(Ar) in the tank can be obtained as illustrated below:
P = P(He) + P(O) + P(Ar)
15.3 = 3.2 + 7.4 + P(Ar)
15.3 = 10.6 + P(Ar)
Collect like terms
15.3 – 10.6 = P(Ar)
4.7 = P(Ar)
P(Ar) = 4.7 atm
Therefore, the pressure of Argon, P(Ar) in the tank is 4.7 atm
31 points PLS HELP!
Sedimentary rocks are formed by ...
Group of answer choices
Sediments being broken down over time
Sediment layers being compressed by the layers upon layers of sediment forming.
Sediments being cemented together.
All of the Above
Answer:
All the above I believe
Explanation:
Answer:
all of above!
Explanation:
Im pretty sure, because all of them happen when forming a sedimentary rock.
A student is titrating 50ml of 2.5M HI with 1.23M NaOH. How many milliliters of base are added to reach the
equivalence point?
Answer:
101.6ml
Explanation:
Using the formula;
CaVa = CbVb
Where;
Ca = concentration of acid (M)
Cb = concentration of base (M)
Va = volume of acid (ml)
Vb = volume of base (ml)
Based on the information as follows:
Ca = 2.5M
Cb = 1.23M
Va = 50ml
Vb = ?
Using CaVa = CbVb
2.5 × 50 = 1.23 × Vb
125 = 1.23Vb
Vb = 125/1.23
Vb = 101.6ml
Which of the following are reasons the ocean marine biomes are a challenging place for organisms to live? Choose all that apply.
Question 13 options:
some areas are extremely dark and deep
high waves can be rough and powerful
all of the organisms have to live without sunlight
organisms have to be able to live in extremely salty conditions
In an ecosystem, the reason that ocean marine biomes are a challenging place for organisms to live because they have to be able to live in extremely salty conditions.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
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Nitrogen-fixing bacteria convert atmospheric nitrogen into forms of nitrogen that living things can use.
Please select the best answer from the choices provided
•T
•F
Answer:
I know im late but its true
Explanation:
E2020 edge
Answer:
true
Explanation:
7
State two signification of melting?
Which of the following indicates that a chemical equation is balanced?
a. The numbers of atoms of each element are the same on both sides of the equation.
b. All of the coefficients are the same.
C. The numbers of molecules on each side of the equation are equal.
d. The sums of the coefficients on each side of the equation are equal.
Question 2 (1 point)
An object's gravitational force depends primarily on the object's
a
density
mass
b
oc
momentum
Answer: An object's gravitational force depends primarily on the object's mass.
Explanation:
According to the Universal law of gravitation, every object whether is it is having large r small mass tends to exert a force on every other object, therefore this force is known as gravitational force.
Formula to calculate gravitational force is as follows.
[tex]F = \frac{G \times m_{1} \times m_{2}}{r^{2}}[/tex]
where,
F = Gravitational force
G = Gravitational constant = [tex]6.674 \times 10^{-11} m^{3}/kg s^{2}[/tex]
[tex]m_{1}[/tex] = mass of object 1
[tex]m_{2}[/tex] = mass of object 2
r = distance between the centers of the objects
Therefore, it means that gravitational force of an object primarily depends on an object's mass.
Thus, we can conclude that an object's gravitational force depends primarily on the object's mass.
A sample of air was collected on a day when the total atmosphere
pressure was 592 mmHg. The sample contained only oxygen and
nitrogen gas. If the oxygen in the sample had a pressure of 261
mmHg, how much pressure did the nitrogen have?
A. 853 mm Hg
B. 0.206 mm Hg
C. 4.76 mm Hg
D. 331 mm Hg
E. Other________
(Please show me how you did it)
Answer:
D. 331 mm Hg
Explanation:
We can solve this problem by keeping in mind the law of partial pressures, which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of its components.
In other words:
P oxygen + P nitrogen = Total PWe input the given data:
261 mmHg + P nitrogen = 592 mmHgAnd calculate the pressure of the nitrogen:
P nitrogen = 331 mmHg9.3 x 10^3 moles of SmO in grams?
Answer:
1.5 grams?
Explanation:
Magnesium nitride, Mg3N, undergoes a thermo decomposition reaction to form magnesium metal and nitrogen gas.
a. True
b. False
Answer:
a. True
Explanation:
Magnesium nitride, Mg₃N, is a binary salt. Upon heating, it decomposes into magnesium metal and nitrogen gas. The unbalanced equation is:
Mg₃N(s) ⇒ Mg(s) + N₂(g)
We can balance it with the trial and error method. First, we will balance N atoms by multiplying Mg₃N by 2.
2 Mg₃N(s) ⇒ Mg(s) + N₂(g)
Then, we get the balanced equation by multiplying Mg by 6.
2 Mg₃N(s) ⇒ 6 Mg(s) + N₂(g)
to find the mass in g of 3 moles Al .
Answer:
81 gm
Explanation:
The mass of 1 mole is 27 gSo, Mass of 3 moles of Aluminium would be 3 × 27 = 81 gm
Thus mass of 3 Moles of Aluminium is 81 gm.
pls help i need help help
Answer:
and is capillaries
Explanation:
hope it helps
If a particular ore contains 56.3 % % calcium phosphate, what minimum mass of the ore must be processed to obtain 1.00 kg k g of phosphorus?
Answer:
34.44 kg
Explanation:
First we convert 1.00 kg of phosphorus (P) into moles, using its molar mass:
1.00 kg ÷ 32 kg/kmol = 0.03125 kmol PThen we convert 0.03125 kmoles of P into kmoles of Ca₃(PO₄)₂:
0.03125 kmol P * [tex]\frac{2kmolCa_3(PO_4)_2}{2kmolP}[/tex] = 0.0625 kmol Ca₃(PO₄)₂Now we calculate the mass of 0.0625 kmoles of Ca₃(PO₄)₂:
0.0625 kmol Ca₃(PO₄)₂ * 310.18 kg/kmol = 19.39 kgFinally we calculate the required mass of the ore, using the definition of content percentage:
% content = Mass of calcium phosphate / mass of ore * 100 %56.3 % = 19.39 kg / mass of ore * 100%Mass of Ore = 34.44 kgAccording to the following reaction, how many grams of hydrogen
gas are required for the complete reaction of 32.5 grams of nitrogen
gas?
nitrogen (g) + hydrogen (g) — ammonia (g)
…grams hydrogen gas
Answer:
7.03 g
Explanation:
Step 1: Write the balanced synthesis reaction
N₂(g) + 3 H₂(g) ⇒ 2 NH₃(g)
Step 2: Calculate the moles corresponding to 32.5 g of N₂
The molar mass of N₂ is 28.01 g/mol.
32.5 g × 1 mol/28.01 g = 1.16 mol
Step 3: Calculate the number of moles of H₂ needed to react with 1.16 moles of N₂
The molar ratio of N₂ to H₂ is 1:3. The moles of H₂ needed are 3/1 × 1.16 mol = 3.48 mol.
Step 4: Calculate the mass corresponding to 3.48 moles of H₂
The molar mass of H₂ is 2.02 g/mol.
3.48 mol × 2.02 g/mol = 7.03 g
In which type of reaction does a reactant compound break down in order to form
two or more compounds or elements in the product?
a. Synthesis
b. Decomposition
c. Combustion
d. Single Displacement
Answer:
decomposition is the answer it helped also explanation of it is below this answer
Explanation:
In a decomposition reaction, one reactant breaks down into two or more products. This is the reverse of a synthesis reaction. Replacement reactions occur when elements switch places in compounds
18. If I need to dilute a 12 M hydrochloric acid solution and make 300 mL of a 0.100 solution, how
much of the 12 M hydrochloric acid do I need?
Explanation:
A 300-ml of 0.100M HCl solution contains
0.100M HCl = (0.100 mol HCl/L) × (0.300 L)
----> 0.03 mol HCl
So we need to find the volume of 12M HCl solution that contains 0.03 mol HCl
0.03 mol HCL = (12 mol HCl/1 L)×V
or
V = (1 L × 0.03 mol HCl)/(12 mol HCl)
= 0.0025 L
= 2.5 ml
So you need 2.5 ml of 12M HCl to be diluted with distilled water to 300 ml in order to get a 0.100M HCl solution.
When of glycine are dissolved in of a certain mystery liquid , the freezing point of the solution is lower than the freezing point of pure . On the other hand, when of ammonium chloride are dissolved in the same mass of , the freezing point of the solution is lower than the freezing point of pure . Calculate the van't Hoff factor for ammonium chloride in .
The given question is incomplete. The complete question is:
When 282. g of glycine (C2H5NO2) are dissolved in 950. g of a certain mystery liquid X, the freezing point of the solution is 8.2C lower than the freezing point of pure X. On the other hand, when 282. g of ammonium chloride are dissolved in the same mass of X, the freezing point of the solution is 20.0C lower than the freezing point of pure X. Calculate the van't Hoff factor for ammonium chloride in X.
Answer: the van't Hoff factor for ammonium chloride is 1.74
Explanation:
Depression in freezing point is given by:
[tex]\Delta T_f=i\times K_f\times m[/tex]
[tex]\Delta T_f=T_f^0-T_f=8.2^0C[/tex] = Depression in freezing point
[tex]K_f[/tex] = freezing point constant = ?
i = 1 ( for non electrolyte)
m= molality
[tex]8.2^0C=1\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}[/tex]
Weight of solvent (X)= 950 g = 0.95 kg
Molar mass of solute (glycine) = 75.07 g/mol
Mass of solute (glycine) = 282 g
[tex]8.2^0C=1\times K_f\times \frac{282g}{75.07g/mol\times 0.95kg}[/tex]
[tex]K_f=2.07[/tex]
ii) [tex]20.0^0C=i\times \times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}[/tex]
Weight of solvent (X)= 950 g = 0.95 kg
Molar mass of solute (ammonium chloride) = 53.49 g/mol
Mass of solute (ammonium chloride) = 282 g
[tex]20.0^0C=i\times 2.07\times \frac{282g}{53.49g/mol\times 0.95kg}[/tex]
[tex]i=1.74[/tex]
Thus the van't Hoff factor for ammonium chloride is 1.74
The tertiary structure of a protein is a complex arrangement formed as the polypeptide chain folds and twists.
a. True
b. False
Answer:
True
Explanation:
The tertiary structure of a protein is a complex arrangement formed as the polypeptide chain folds and twists.
This folding & twisting of polypeptide chain leading to its complex structure, is true about tertiary structure of protein. It occurs due to different interactions between side chains of amino acids.
2. Acceleration is______
proportional to mass,
Answer:
Inversely
Explanation:
The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
what are the compounds that cause acid rain?
Answer:
Explanation:
Its a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances rise high into the atmosphere in which they mix and react with water, oxygen, and other chemicals to form more acidic pollutants.
Answer:
Explanation:
Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.
Kantahan moko sa lobby ml tayo babae 11 years old mayhem folow me 908723751 Mobile Legends Bang bang
Answer:
hi which language is this???
I can't understand
Answer:
Filipino hello pari omsim
match the molecular shapes to the correct Lewis structures
trigonal pyramid
trigonal planar
bent
tetrahedral
linear
Answer:
Match up correct answers:
1) trigonal planar
2) tetrahedral
3) trigonal pyramid
4) linear
Explanation:
(correct answers on portal and edmentum users)
Hope I was helpful, have a great day and good luck :)
AlH₃ - trigonal planar
CH₂F₂ - tetrahedral
PH₃ - trigonal pyramidal
O₃ - bent
What is a Lewis structure?The valence shell electrons in a molecule are depicted in an extremely simplified manner by a Lewis Structure. It is used to demonstrate how the electrons in a molecule are positioned around particular atoms. Electrons are shown as dots or, in the case of a bond, as a line connecting the two atoms.
How do you determine the molecular shape?Depict the Lewis Structure.Determine if the electron groups are in bond pairs or are lone pairs by counting the number of electron groups. Keep in mind that lone pairs and bonds are both included in electron groups!The electron-group geometry is named. (Specify if it is octahedral, tetrahedral, trigonal-bipyramidal, or linear.)The molecular geometry is determined by examining the locations of the surrounding atomic nuclei. (Count the number of lone pairs)Learn more about molecular geometry here:
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In a rush, a student only measured the mass of the empty beaker once before beginning
the experiment and one more time after the entire experiment was finished. The mass of
the empty beaker was found to be 0.123g less at the end of the experiment. What
happened?
Answer:
The student measured the cup and got an incorrect answer
Explanation:
because he was in a rush.
Match the solutions to the descriptions of the freezing points.a. One mole of the ionic compound Na3PO4 dissolved in 1000 g H2O b. One mole of the ionic compound CuSO4 dissolved in 1000 g H2O c. One mole of the nonelectrolyte C6H12O6 dissolved in 1000 g H2O1. Highest freezing point 2. Intermediate freezing point 3. Lowest freezing point
Explanation:
Depression in Freezing point
= Kf × i × m
where m is molality , i is Van't Hoff factor, m = molality
Since molality and Kf remain the same
depression in freezing point is proportional to i
i= 2 for CuSO4 ( CuSO4----------> Cu+2 + SO4-2
i=1 for C2h6O
i= 3 for MgCl2 ( MgCl2--------> Mg+2+ 2Cl-)
So the freezing point depression is highest for MgCl2 and lowest for C2H6O
so freezing point of the solution = freezing point of pure solvent- freezing point depression
since MgCl2 has got highest freezing point depression it will have loweest freezing point and C2H6O will have highest freezing point
Certain species of fish are unsafe to consume in high quantities because these fish
a. are endangered species
b. have high levels of metals in them from cancer- causing pesticides
c. ingest other fish that are poisonous to humans
d. contain vitamins that aren't water-soluble and can cause toxicity
Answer:B
Explanation: Pennfoster answer
SOMEONE HELP ME
1. How many grams of C are present in 4.86 grams of carbon dioxide
?
grams C.
2. How many grams of carbon dioxide contain 1.73 grams of O ?
grams carbon dioxide.
Answer:
1. 1.33 gram of carbon
2. 2.38g of carbon dioxide
Explanation:
From the given information:
Total amount of CO₂ = 4.86 grams
Atomic mass of C = 12 g/mole
molar mass of CO₂ = 44 g/mole
∴
The mass of the Carbon (C) in grams is:
[tex]= Total\ amount \ of \ CO_2 \times \dfrac{12 \ g/mol}{44 \ g/mol}[/tex]
[tex]= 4.86 \ g \times \dfrac{12 \ g/mol}{44 \ g/mol}[/tex]
= 1.33 gram of carbon
2.
Here, the total amount of CO₂ = unknown
Atomic mass of O₂ = 32 g/mole
molar mass of CO₂ = 44 g/mole
amount of oxygen = 1.73 g
∴
The mass of CO₂ = [tex]Total \ amount \ of \ O_2 \times \dfrac{44 \ g/mol}{32\ g/mol}[/tex]
[tex]=1.73 \times \dfrac{44 \ g/mol}{32\ g/mol}[/tex]
= 2.38 g of carbon dioxide