Answer:
What is this asking for?
Explanation:
I’ll put the answer in the comments
3 moles of hydrogen occupy a volume of 67.20 L, at standard temperature and pressure (STP, 0 ˚C and 760 mmHg). What is the density of hydrogen at STP?
Answer:
The correct answer is 0.089 g/L ≅ 0.09 g/L
Explanation:
Density is defined as: mass/volume.
From the problem we have:
number of moles = n = 3 mol
volume = V = 67.20 L
We have to calculate the mass. For this, we need the molar mass (MM) of the gas. That is easily calculated from the molar mass of the element hydrogen (H), as we know that hydrogen gas has the molecular formula H₂:
MM(H₂) = 2 x molar mass H = 2 x 1 g/mol = 2 g/mol
Now, we multiply n by MM to obtain the mass (m) of the gas:
m = n x MM(H₂) = 3 mol x 2 g/mol = 6 g
Finally, we calculate the density from the mass and volume:
density = m/V = 6 g/(67.20) = 0.089 g/L ≅ 0.09 g/L
which of the following requires the most energy to break a bond? a. breaking cl-br bond. b. breaking a n-p bond. c. breaking a o-o bond. d. none of the above.
A. Breaking a Cl-Br bond
What atomic or hybrid orbital on C makes up the sigma bond between C and O in carbon dioxide, CO2 orbital on C. What is the approximate O-C-O bond angle ?
Answer:
sp hybridized orbitals
The bond angle is 180 degrees
Explanation:
Molecules are formed by overlap of atomic orbitals. Hybridization is a valence bond concept. According to this concept, atomic orbitals are mixed to obtain orbitals of appropriate energy, suitable for bonding.
The sigma bonds in CO2 are formed by sp hybridized carbon atoms. The bond angle of sp hybridized carbon atoms is 180 degrees leading to a linear shape.
Non-metallic properties are more pronounced: 1) Si 2) B 3) O 4)S
Answer:
1. Si
hope this helped
If a cell is 80% water and the outside environment is 90% water. What is likely to happen?
A. water will rush into the cell
B. net movement of water will be equal
C. water will not move into or out of the cell
D. water will rush out of the cell
which 2 organ systems work together to break down and deliver food molecules to cells
A. Cardiovascular and immune
B. Nervous and muscular
C. Digestive and cardiovascular
D. Respiratory and cardiovascular
PLEASE HURRY I NEED THIS ANSWER
Answer:
C
Explanation:
The stomach digests the food (Digestive System) are the nerves and they send the protein etc.
A 0.700 g unknown mixture with CaCl2 reacts with aqueous sodium phosphate to give 0.425 g Ca3(PO4)2. Show calculation for the percentage CaCl2?
The percentage CaCl₂ : 65.14%
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction
3CaCl₂+2Na₃PO₄⇒Ca₃(PO₄)₂ + 6NaCl
mol Ca₃(PO₄)₂(MW=310.18 g/mol) :
[tex]\tt \dfrac{0.425}{310.18}=0.00137[/tex]
mol ratio CaCl₂ : Ca₃(PO₄)₂ = 3 : 1, so mol CaCl₂ :
[tex]\tt \dfrac{3}{1}\times 0.00137=0.00411[/tex]
mass CaCl₂ (MW=110.98 g/mol) :
[tex]\tt 0.00411\times 110.98=0.456~g[/tex]
The percentage CaCl₂ :
[tex]\tt \%CaCl_2~in~mixture=\dfrac{0.456}{0.7}\times 100\%=65.14\%[/tex]
Solve the following 2 questions below, involving elements and reactions. *
1. There are 400 grams of NaCI in this substance. There are 10 drops in this substance. If each drop has an equal amount of NaCI in it, how much grams of NaCI are in 1 drop?
2. There are 800 grams of Barium peroxide in this mixture. There are 40 drops. If each drop has the same amount of Barium peroxide, how much is in 1 drop?
Please help me urgently with my homework, it would help much.
Answer:
1. 40 grams of NaCI
2. 20 grams of Barium Peroxide
Explanation:
In this question, we have to divide to find the amount of each element in a drop.For Question 1, there are 400 grams of NaCI. There are 10 drops.
So, we have to divide 400 by 10.
400 / 10 = 40We get 40 as our result, so 40 is the answer.
Same for this question, we use the process we did before.There are 800 grams of barium peroxide, and there are 40 drops.
So, we divide 800 by 40.
800 / 40 = 20We have the answer as 20.
Our final answers are going to be listed below:
Question 1 - 40Question 2 - 20Hope this helps you!
*Make proportions to solve. Find the rate from the question 1.
Question 1 is 40.
There are 400 grams of NaCI. There are 10 drops.
Divide 400 by 10.
400 / 10 = 40
40 is the answer.
Now all we do is repeat the same process for question 2.
Question 2 is 20.
There are 800 grams of barium peroxide, and there are 40 drops.
Divide 800 by 40.
800 / 40 = 20
Answer = 20.
Scientists use models to help them represent things in nature that they cannot observe directly. They can also use models to make predictions. For example, scientists use Bohr models of atoms to predict chemical reactions between atoms, You can use models in the same way, but you must first understand what each model component represents. Which element is represented by this Bohr model?
A. chlorine (Cl)
B.oxygen (O)
C. selenium (Se)
D. sulfur (S)
Answer:
I think it’s chlorine (Cl)
Explanation:
I’m literally doing the same question right now
If I have an unknown quantity of gas at STP with a volume of 41 liters, how many moles of gas do
have?
Answer:1 mol
Explanation:
the conversion from mol to volume of gas at STP is 22.4L, meaning that the amount of mols in a gas of volume 22.4L at STP is one mol.
(7th grader sorry if its wrong)
At STP, 32 grams of O2 would occupy the same volume as:
At STP 32 g of O₂ would occupy by the same volume as 4 g of He
Further explanationComplete question
At STP 32 g of O₂ would occupy by the same volume as:
4.0 g of He8.0 g of CH₄64 g of H₂32 g of SO₂Standard Conditions
Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters / mol.
So the gas will have the same volume if the number of moles is the same
mol of 32 grams of O₂ :
[tex]\tt \dfrac{32}{32}=1[/tex]
He[tex]\tt mol=\dfrac{4}{4}=1[/tex]
CH₄[tex]\tt mol=\dfrac{8}{16}=0.5[/tex]
H₂[tex]\tt mol=\dfrac{64}{2}=32[/tex]
SO₂[tex]\tt mol=\dfrac{32}{64}=0.5[/tex]
So mol of 4 g He = mol of 32 g O₂
STP is the standard temperature and pressure of the gas to compare with the experimental data. At STP 32 gm of oxygen is equivalent to 4 gm of helium.
What is STP?STP is the standard temperature and pressure of 0 degrees Celsius and 1 atm. At this temperature and pressure, the volume of the gas is 22.4 L/mol.
So, if the moles of the 32 gm oxygen are the same as the other element then the volume will also be the same. Here, the moles of oxygen are 1 mol.
Moles of 4 gm helium is 1, 8 gm methane is 0.5 mol, 64 gm dihydrogen is 32 mol, and 32 gm sulfur dioxide is 0.5 mol.
Therefore, the mole of 4 gm helium is equivalent to the mole of 32 gm oxygen.
Learn more about STP here:
https://brainly.com/question/25705287
Calculate the molar solubility of mercury (I) bromide, Hg2Br2, in 1.0 M KBr. The Ksp for Hg2Br2 is 5.6 X 10−23. (Hint: How would the Br− concentration from the sparingly soluble compound itself compare to the Br− concentration that comes from the KBr?
Answer:
The correct answer is 5.6 × 10⁻²³ M.
Explanation:
As a highly soluble salt, KBr dissolves easily in water, while Hg₂Br₂ is very less soluble in comparison to KBr.
Let the solubility of Hg₂Br₂ is S mol per liter.
Therefore,
KBr (s) (1.0 M) ⇒ K⁺ (aq) (1M) + Br⁻ (aq) (1M)
Hg₂Br₂ (s) (1-S) ⇔ Hg₂⁺ (aq) (S) + 2Br⁻ (aq) (2S)
Net [Br-] = (2S + 1) M
Ksp = S (2S + 1)²
Ksp = S (4S² + 1 + 4S)
Ksp = 4S³ + S + 4S²
As the solubility is extremely less, therefore, we can ignore S² and S³. Now,
Ksp = S = 5.6 × 10⁻²³ M
Hence, the solubility of Hg₂Br₂ is 5.6 × 10⁻²³ M.
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Answer:
What do you need help with?
Explanation:
Calculate the total Calories in one cup of watermelon containing 0.9 g protein, 0.2 g fat, and 11 g carbohydrat
Answer:
49.4 cal
Explanation:
Step 1: Given data
Composition of 1 cup of watermelon: 0.9 g protein, 0.2 g fat, and 11 g carbohydrate.
Step 2: Calculate the calories provided by 0.9 g of protein
1 g of protein yields 4 cal.
0.9 g × (4 cal/1 g) = 3.6 cal
Step 3: Calculate the calories provided by 0.2 g of fat
1 g of fat yields 9 cal.
0.2 g × (9 cal/1 g) = 1.8 cal
Step 4: Calculate the calories provided by 11 g of carbohydrate
1 g of carbohydrate yields 4 cal.
11 g × (4 cal/1 g) = 44 cal
Step 5: Calculate the total number of calories
3.6 cal + 1.8 cal + 44 cal = 49.4 cal
Would someone mind helping me? I really need this answer but I'm so confused. I would appreciate any help :) and if you get the answer right, ill give you brainliest.
Answer:
A
Explanation:
liquids thake the shape of what holds them so shape is changing and volume is the same
g chemist accidentally leaves an open beaker containing 250.0 mL of a 0.500 M NaHCO3(aq) solution on a lab bench. They return a few weeks later to find that the volume of the solution has decreased to 75.0 mL. What is the molarity of this partially evaporated solution, assuming the solute does not evaporate
Answer:
1.67 M
Explanation:
The following data were obtained from the question:
Initial volume (V1) of solution = 250 mL
Initial Molarity (M1) of solution = 0.5 M
Final volume (V2) of solution = 75 mL
Final Molarity (M2) of solution =?
Thus, we can obtain the final molarity of the solution by using the following formula:
M1V1 = M2V2
0.5 × 250 = M2 × 75
125 = M2 × 75
Divide both side by 75
M2 = 125 /75
M2 = 1.67 M
Thus, the new Molarity of the solution is 1.67 M.
What is a chemical change?
A change in matter from one form to another that doesn't result in a different substance
A gravitational pull that results in a different substance
A reaction or change in a substance that creates more of the same substance
A reaction or change in a substance that results in a different substance
Answer:
D. A reaction or change in a substance that results in a different substance
Explanation:
Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.
If the earth were to spin half as fast as it does now, how many hours would be in one day?
Answer:
48 hours
Explanation:
Because if the world would spin regularly, then it would take 24 hours. But if it spins half as fast, then it would be 2x more.
A force is a pushing or pulling action that can make objects move or change direction. How does this concept of force relate to the heart, blood and function of the circulatory system?
What mass of sodium carbonate is required for complete reaction with 8.35 g of nitric acid to produce sodium nitrate, carbon dioxide, and water?
Mass of sodium carbonate = 7.022 g
Further explanationReaction
Na₂CO₃ + 2HNO₃ ⇒ 2NaNO₃ + H₂O + CO₂
mol of HNO₃ (MW=63,01 g/mol):
[tex]\tt mol=\dfrac{8.35}{63.01}=0.1325[/tex]
mol Na₂CO₃
[tex]\tt \dfrac{1}{2}\times 0.1325=0.06625[/tex]
mass Na₂CO₃(MW = 105,9888 g/mol) :
[tex]\tt 0.06625\times 105,9888 g/mol=7.022~g[/tex]
The mass of sodium carbonate that is required for complete reaction with 8.35 grams of nitric acid is equal to 7.02 grams.
Given the following data:
Mass of nitric acid = 8.35 gramsScientific data:
Molar mass of [tex]HNO_3[/tex] = 63 g/mol.Molar mass of [tex]Na_2CO_3[/tex] = 106 g/mol.To determine the mass of sodium carbonate that is required for complete reaction with 8.35 grams of nitric acid:
First of all, we would write the properly balanced chemical equation for this chemical reaction:
[tex]Na_2CO_3 + 2HNO_3 \rightarrow 2NaNO_3 + H_2O + CO_2[/tex]
Next, we would find the number of moles of nitric acid ([tex]HNO_3[/tex]) required:
[tex]Number\;of\;moles = \frac{Mass}{molar\;mass}\\\\Number\;of\;moles = \frac{8.35}{63 }[/tex]
Number of moles = 0.1325 moles.
By stoichiometry:
2 moles of [tex]HNO_3[/tex] = 1 mole of [tex]Na_2CO_3[/tex]
0.1325 moles of [tex]HNO_3[/tex] = X mole of [tex]Na_2CO_3[/tex]
Cross-multiplying, we have:
[tex]2X=0.1325\\\\X=\frac{0.1325}{2}[/tex]
X = 0.0663 moles
Now, we can determine the mass of sodium carbonate that is required:
[tex]Mass = Number\;of\;moles \times molar\;mass\\\\Mass = 0.0663 \times 106[/tex]
Mass of [tex]HNO_3[/tex] = 7.02 grams
Read more: https://brainly.com/question/16906167
can a water cycle ever end
Answer:
No It cannot.
Explanation:
A water cycle does not have an end as it moves all around the earth
The process:
A water cycle can start by water evaporating through the sun's heat from a water bed, such as: Ocean, sea, pond etc.
The heat from the sun will turn the water into water vapour and will go up into the atmosphere.
The water vapor gets together with other vapors and forms clouds.
These clouds will move around the earth, once they are so full of water they drop the water to Earth in some form of precipitation. It could be rain, snow, sleet, or hail.
These water will form ponds or go back in the ocean and the process wil repeat again.
how has the world's changing climate today affected glaciers and sea levels
Answer:
Global warming is causing global mean sea level to rise in two ways. First, glaciers and ice sheets worldwide are melting and adding water to the ocean. ... A third, much smaller contributor to sea level rise is a decline in the amount of liquid water on land—aquifers, lakes and reservoirs, rivers, soil moisture.
Explanation:
Answer:
It has caused sea levels to rise and caused glaciers to melt.
Explanation:
Because glaciers and ice caps are melting rapidly and they store about 1.7% all of Earth's water, causing sea levels to rise.
2-methyl-butanamide hydrolysis with NaOH
2-methyl-butanamide hydrolysis with NaOH forms a carboxyllic acid, sodiun salt of 2-methyl butanoic acid and ammonia
Explanation:
How much kilometers is in 6 m
Answer: 0.006 km
Explanation:
divide the length value by 1000
so 6/1000 = 0.006
If a 60 kg person on a 15 kg sled is pushed with a force of 300 N, what will be person’s acceleration?
Answer:
a = 4 ms⁻²
Explanation:
Given data:
Mass of person = 60 Kg
Mass of sled = 15 kg
Applied force = 300 N
Acceleration = ?
Solution:
Formula:
F = ma
F = force
m = mass
a = acceleration
now we will put the values in formula.
300 N = (60 Kg+ 15 kg) × a
300 N = 75 Kg × a
a = 300 N/ 75 Kg
N = kgm/s²
a = 4 ms⁻²
Calculate the mass of Na2O that can be produced by the chemical reaction of 4.0 grams of sodium with excess oxygen in the reaction.
4NA + O2 ⟶ 2Na2O
Answer:
The mass of Na₂O that can be produced by the chemical reaction of 4.0 grams of sodium with excess oxygen in the reaction is 5.39 grams.
Explanation:
You know the balanced reaction:
4 NA + O₂ ⟶ 2 Na₂O
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction) react and are produced:
Na: 4 molesO₂: 1 moleNa₂O: 2 molesBeing:
Na: 23 g/oleO: 16 g/molethe molar mass of the compounds participating in the reaction is:
Na: 23 g/moleO₂: 2*16 g/mole= 32 g/moleNa₂O: 2*23 g/mole +16 g/mole= 62 g/moleThen by stoichiometry of the reaction they react and are produced:
Na: 4 moles* 23 g/mole= 92 gO₂: 1 mole*32 g/mole= 32 gNa₂O: 2 moles* 62 g/mole= 124 gThen you can apply the following rule of three: if 92 grams of Na produce 124 grams of Na₂O, 4 grams of Na, how much mass of Na₂O does it produce?
[tex]massofNa_{2}O =\frac{4 grams of Na*124 gramsofNa_{2}O }{92 grams of Na}[/tex]
mass of Na₂O=5.39 g
The mass of Na₂O that can be produced by the chemical reaction of 4.0 grams of sodium with excess oxygen in the reaction is 5.39 grams.
2. A green laser pointer emits light at 554 nm. Calculate the frequency of this light and the energy of a photon of this light.
Answer:
Explanation:
Wavelength (λ) = speed/frequency
(λ) = c/f
Where;
c = speed (3× 10^8m/s)
f = frequency (Hz)
(
How many moles are in 1.2 x 1023 Rps?
what is the definition of solute
Answer:
a substance that can be dissolved by a solvent to create a solution
Explanation:
Answer:
the minor component in a solution dissolved in a solvent
What is the connection between living organisms and atoms
Atoms form molecules. A molecule is a chemical structure consisting of at least two atoms held together by one or more chemical bonds. ... All living things are made of cells; the cell itself is the smallest fundamental unit of structure and function in living organisms.
Answer:
Explanation: Atoms form molecules. A molecule is a chemical structure consisting of at least two atoms held together by one or more chemical bonds. ... All living things are made of cells; the cell itself is the smallest fundamental unit of structure and function in living organisms.