Answer:
Answer is D. All of the above
What is the pOH of an aqueous solution with a pH of 10.6?
Answer:
pOH=3.4
Explanation:
pH + pOH = 14
So if you have the pH, rearrange the equation:
14-10.6=3.4
Determine the number of moles of hydrogen atoms in each of the following.
8.55×10^-2 mol C4H10
Answer:
[tex]0.855molH[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible for us to realize this problem is about mole ratios. Thus, for the compound C4H10, note there is a 1:10 mole ratio to the hydrogen atoms, that is why the number of moles of the latter is calculated as shown below:
[tex]8.55x10^{-2} mol C_4H_{10}*\frac{10molH}{1molC_4H_{10}} \\\\=0.855molH[/tex]
Regards!
For the following, you will complete an atom count, but you will first need to make the list of atoms. After the count is complete, determine whether the equation is balanced.
N2H4 + N2O4 → 3 N2 + 4 H2O
please help
Answer: The equation [tex]N_{2}H_{4} + N_{2}O_{4} \rightarrow 3N_{2} + 4H_{2}O[/tex] is not a balanced equation.
Explanation:
A chemical equation which contains same number of atoms on both reactant and product side is called a balanced chemical equation.
For example, [tex]N_{2}H_{4} + N_{2}O_{4} \rightarrow 3N_{2} + 4H_{2}O[/tex]
Here, number of atoms on reactant side are as follows.
N = 4H = 4O = 4Number of atoms on product side are as follows.
N = 6H = 8O = 1Since, the number of atoms present on reactant side are not equal in number as compared to the atoms present on product side. Hence, this equation is not balanced.
Thus, we can conclude that the equation [tex]N_{2}H_{4} + N_{2}O_{4} \rightarrow 3N_{2} + 4H_{2}O[/tex] is not a balanced equation.
Which of these are an important part of a scientific process?
Einstein's equation what does it mean? what does it apply ?
Einstein's Big Idea homepage. E = mc2. It's the world's most famous equation, but what does it really mean? "Energy equals mass times the speed of light squared." On the most basic level, the equation says that energy and mass (matter) are interchangeable; they are different forms of the same thing.
Which of the following pairs of elements could NOT react to
form an ionic compound? Check all that apply.
Answer:
Carbon and Oxygen cannot react to form an ionic compound because the two elements are non-metals. To form an ionic bond, a metal combines with a non-metal through electrostatic attraction of oppositely charged ions.
Answer:
Explanation:
The two that won't are C and O. They will react, but not ionically. O is on the left of the Periodic table and C is more or less in the middle. They form CO carbon Monoxide and CO2 which is Carbon Dioxide. They are just not ionic.
Increasing which factor will not increase the rate of a chemical reaction?
A: concentration of reactants
B: heat
C: product
D: surface area
Answer:
c. product
i had the test
Name: ___________________________ Date: __________ Period: ______ Solubility Rules Practice Worksheet Name or give the chemical formula for each of the following compounds. State whether they are soluble (will dissolve) or insoluble (will not dissolve) in solution. Use solubility rules. Chemical Formula Name Solubility NH4OH Ra(OH)2 Nickel (III) Acetate CsOH RbCl Potassium Phosphate MgS CaI2 Gold (II) Hydroxide Li3PO4 Platinum (II) Carbonate Barium Nitrate
How do scientists design a system?
O A. They use a system that has already been designed.
O B. They ignore influences from sources outside of the experiment.
C. They include all possible influences in their model.
D. They isolate their experiment from unwanted influences.
Answer: D
Explanation:
The scientists design a system by isolate their experiment from unwanted influences. Therefore, option D is correct.
What is system ?Chemistry's field of systems chemistry strives to understand intricate webs of interdependent molecules and their system-level characteristics. These characteristics cannot be attributed to the individual components working independently, but rather to the aggregate behavior of the system's components.
A system is a well-organized group of components that work closely together to achieve a single objective. The system receives a variety of inputs, processes those inputs through certain steps to produce specific outputs, and then combines those outputs to achieve its overall objective.
The two main categories are natural systems and designed systems. Subatomic systems, various types of biological systems, our planet, the solar system, the galactic system, and the universe are all examples of natural systems.
Thus, option D is correct.
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A student experimentally determines the density of a plastic cube using the caliper method, liquid displacement method, and suspension method. The cube's true density is 0.9822 g/cm3. Use the student's collected data below to answer the following questions.
Student's Collected Data
Cube's Mass 0.66g
Caliper Method
Edge Length 0.85 cm
Liquid Displacement Method
Volume of Liquid 5.5 mL
Volume of Liquid + Object 6.2 mL
Required:
Determine the density of the cube for each method.
Answer:
- density of the cube for Caliper Method is 1.08 g/mL
- density of the cube for Liquid Displacement Method is 0.94 g/mL
Explanation:
Given the data in the question;
The cube's true density = 0.9822 g/cm³
Student's Collected Data;
Cube's Mass = 0.66g
Caliper Method
Edge Length = 0.85 cm
Liquid Displacement Method
Volume of Liquid = 5.5 mL
Volume of Liquid + Object = 6.2 mL
For Caliper Method;
Edge Length = 0.85 cm
so the volume of the cube will be ( 0.85 cm )³ OR 0.614125 cm³ ≈ 0.61 cm³ = 0.61 mL
so Density will be;
Density[tex]_{caliper[/tex] = mass of cube / volume of cube
we substitute
Density[tex]_{caliper[/tex] = 0.66g / 0.61 mL
Density[tex]_{caliper[/tex] = 1.08 g/mL
Therefore, density of the cube for Caliper Method is 1.08 g/mL
For Liquid Displacement Method;
Volume of object = total volume - volume of liquid
= 6.2 mL - 5.5 mL = 0.7 mL
now, Density of object will be;
Density[tex]_{Liquid-Displacement[/tex] = mass / volume
we substitute
Density[tex]_{Liquid-Displacement[/tex] = 0.66 g / 0.7 mL
Density[tex]_{Liquid-Displacement[/tex] = 0.942857 ≈ 0.94 g/mL
Therefore, density of the cube for Liquid Displacement Method is 0.94 g/mL
The addition of dimethylglycoxime, H2C4H6O2N2, to a solution containing nickel(II) ion gives rise to a precipitate: Ni2 2H2C4H6O2N2 Ni(H2C4H6O2N2)2 2H If 0.15 g nickel alloy is treated with dimethylglycoxime and .175 mg nickel dimethylglycoxime is collected. Determine the mass and percent of nickel in the alloy.
Solution :
The balanced equation is :
[tex]$Ni^{2+}+2H_2C_4H_6O_2N_2 \rightarrow Ni(H_2C_4H_6O_2N_2)_2+2H^+$[/tex]
Molar mass 56.7 116 290.7
From the balanced equation,
2 mole
= 2 x 116 g of [tex]$H_2C_4H_6O_2N_2$[/tex] produces 1 mole = 290.7 g of nickel dimethylglycoxime
or 2 x 116 mg of [tex]$H_2C_4H_6O_2N_2$[/tex] produces 1 mole = 290.7 g of nickel dimethylglycoxime
0.175 mg of [tex]$H_2C_4H_6O_2N_2$[/tex] produces [tex]$\frac{0.175 \times 290.7}{2 \times 116}$[/tex] = 0.219 mg of nickel dimethylglycoxime
290.7 g of [tex]$Ni(H_2C_4H_6O_2N_2)_2$[/tex] contains 58.7 mg of Ni
0.219 mg of [tex]$Ni(H_2C_4H_6O_2N_2)_2$[/tex] contains [tex]$\frac{0.219 \times 58.7}{290.7} = 0.0443$[/tex] mg of Ni
So mass of nickel, m = 0.0443 mg = [tex]$0.0443 \times 10^{-3}$[/tex] g
Percent of Nickel in the alloy = [tex]$\frac{\text{mass of nickel}}{\text{mass of alloy}} \times 100$[/tex]
[tex]$=\frac{0.0443 \times 10^{-3}}{0.159}\times 100$[/tex]
= 0.03%
True or False. Water pressure increases as you travel deeper.
Answer:
The answer is true.
Explanation:
The deeper you go the more water there's on top of you pushing down.
Answer:
True
Explanation:
3. At 34.0°C, the pressure inside a nitrogen-filled tennis ball with a volume of 148 cm3 is 212
kPa. How many moles of N2 are in the tennis ball?
Answer:
0.0123 mol
Explanation:
Step 1: Convert 34.0 °C to Kelvin
We will use the following expression.
K = °C + 273.15 = 34.0 + 273.15 = 307.2 K
Step 2: Convert 148 cm³ to L
We will use the conversion factors:
1 cm³ = 1 mL1 L = 1000 mL[tex]148cm^{3} \times \frac{1mL}{1cm^{3}} \times \frac{1L}{1000mL} = 0.148L[/tex]
Step 3: Convert 212 kPa to atm
We will use the conversion factor 1 atm = 101.325 kPa.
212 kPa × 1 atm / 101.325 kPa = 2.09 atm
Step 4: Calculate the moles of nitrogen gas
We will use the ideal gas equation.
P × V = n × R × T
n = P × V / R × T
n = 2.09 atm × 0.148 L / (0.0821 atm.L/mol.K) × 307.2 K = 0.0123 mol
Write in exponential form: 34⋅34⋅34⋅34⋅34⋅34⋅34⋅34.
Answer:
34^8
Explanation:
What Energy transformation occurs when gasoline burns in an automobile
Answer:
The release of energy from fuels is used to make other forms of energy. When gasoline burns in a car engine, some of the chemical energy in the gasoline is converted into heat. The heat is converted into mechanical energy. The mechanical energy moves the car.I hope this helped!
Explanation:
Which peptide is synthesized by the following nucleotide sequence of mRNA: ccacagucugcaguuuag
1. Watch how the solubility of a gas changes as pressure is increased and then decreased during the run. Which of the following statements correctly explain the relationship between the solubility of a gas and its pressure?
A. As pressure decreases, the concentration of gas molecules in the solution increases.
B. The concentration of gas particles in the solution is higher at 4.25 atm than at 1.00 atm.
C. The solubility of a gas decreases with a decrease in pressure.
D. The solubility of nitrogen gas at 2.00 atm is twice the solubility of the gas at 1.00 atm.
E. Fewer gas molecules are soluble at higher pressures.
F. More gas molecules are soluble as pressure is increased.
G. As pressure is increased, the rate at which gas molecules enter the solution decreases.
2. At a certain temperature, the solubility of N2 gas in water at 3.08 atm is72.5mg of N2 gas/100 g water. Calculate the solubility of N2 gas in water, at the same temperature, if the partial pressure of N2 gas over the solution is increased from 3.08 atm to 8.00 atm .
Answer:
A. As pressure decreases, the concentration of gas molecules in the solution increases.
D. The solubility of nitrogen gas at 2.00 atm is twice the solubility of the gas at 1.00 atm.
F. More gas molecules are soluble as pressure is increased.
The solubility is 188.3 mg of N2 gas/100 g water.
Explanation:
As the pressure on the gas decreases, the volume of gas molecules in the solution increases due to having distance from each other. The solubility of nitrogen gas at 2.00 atm is twice the solubility of the gas at 1.00 atm because there is more pressure on the gas molecules so due to more compression, the gas becomes more soluble. More gas molecules are soluble as pressure is increased. The solubility is 188.3 mg of N2 gas/100 g water if the atmospheric pressure is increases from 3.08 atm to 8.00 atm. This value is calculated with the help of formula i.e. P2/P1 = S2/S1.
Which of the following is true?
The imaginary one subscript does not have a Greek prefix
The name of C6 H10 F6 is hexacarbide decahydrogen hexafluorine.
The name for the N2 molecule would have no Greek prefixes in it.
To name a covalent molecule you always change the ending on the metal atom.
Answer:
The name for the N2 molecule would have no Greek prefixes in it.
Explanation:
Prefixes and suffixes are used to name compounds that have many component parts.
The molecule N2 is just a simple molecule that consists of only two atoms of nitrogen. It is a diatomic molecule hence there are no Greek prefixes in the name of the molecule.
The molecule is simply identified as nitrogen gas.
The air we breathe contains different individual gases (mostly nitrogen and oxygen). Which of the following correctly describes the air we breathe? A. mixture B. liquid C. compound D. element
Answer:
A. Mixture
Explanation:
Our air has a group of gases. For example, you said nitrogen & oxygen, Which is significantly a mixture.
Which of the atoms shown has an atomic number of 4?
Answer:
B. Be
Explanation:
When sodium chloride is dissolved in water, the freezing point of water _________. A. increases B. first increases, then decreases C. does not change D. decreases
The presence of a non-volatile salt will decrease the freezing point of water and this process is called depression in freezing point. Thus option D is correct.
What is freezing point?Freezing point of a substance is the temperature at which it converts from its liquid state to solid state where, both the states are in equilibrium. Freezing point of water is zero degree celsius.
The freezing point of a solvent depends on some parameters such as the bond type, molecular weight, temperature, pressure etc.
When a non-volatile solute is added to the solvent its freezing point decreases from its initial value. Because presence of non-volatile salts will affect the intermolecular attraction and thereby the energy that must be applied to freeze the compound.
Therefore, the freezing point of water decreases, when sodium chloride is added into it. Thus option D is correct.
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When considering free energy change, biochemists usually define a standard state, the biochemical standard state, which is modified from the chemical standard state to fit biochemical applications. Determine which of the phrases describe the biochemical standard state, the chemical standard state, or both.
a. Temperature is 25C
b. Initial concentration of reactants and products is 1M
Answer:
Chemical standard state
a. Temperature is 25C
b. Initial concentration of reactants and products is 1M
Biochemical standard state
a. Temperature is 25C
b. Initial concentration of reactants and products is 1M
Explanation:
The standard state is the reference state of a material which can be used to calculate its properties under other nonstandard conditions.
The biochemical standard state include;
a. Temperature is 25C
b. Initial concentration of reactants and products is 1M
Similarly, the chemical standard state include;
a. Temperature is 25C
b. Initial concentration of reactants and products is 1M
Hence the answer.
Ethanol is a common laboratory solvent and has a density of 0.789 g/mL. What is the mass, in grams, of 131 mL of ethanol?
Answer:
m=103g
Explanation:
Hello there!
In this case, according to the given information, it is possible for us to say that this problem is solved by considering the concept of density, as the degree of compactness of a substance and mathematically defined as the mass divided by the volume (d=m/V). In such a way, for this problem, we solve for the mass as follows:
m=d*V
And we plug in the density and volume to obtain:
m=0.789g/mL*131mL
m=103g
Regards!
Ethanol is a common laboratory solvent and has a density of 0.789 g/ml. 103.359 g is the mass of 131 mL of ethanol.
Mass is a physical property of matter that measures the amount of substance in an object. It is typically measured in grams (g) or kilograms (kg).
To calculate the mass of 131 mL of ethanol, we need to use the density of ethanol.
Density of ethanol = 0.789 g/mL
Mass = Volume x Density
Substituting the given values, we get:
Mass = 131 mL x 0.789 g/ml
= 103.359 g
Therefore, the mass of 131 mL of ethanol is 103.359 g.
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The chemical reaction between water and magnesium is?
Answer: hydrogen gas
Explanation: When magnesium interacts with water, it will form a hydrogen gas that ignites violently due to the excessive heat and oxygen supply.
21. A piece of metal with a a mass of 15.2 g is heated from 17°C to 42°C. In the process it absorbs 1362 J of
energy as heat. What is the specific heat of the metal?
TO
Answer:
3.58J/g°C is the specific heat of the metal
Explanation:
The specific heat of a material is defined as the energy that 1g of the material absorbs and produce the increasing in temperature in 1°C. The equation is:
Q = S*ΔT*m
Where Q is energy = 1362J
S is specific heat of the material
ΔT is change in temperature = 42°C - 17°C = 25°C
And m is the mass of the material = 15.2g
Replacing:
S = Q / ΔT*m
S = 1362J / 25°C*15.2g
3.58J/g°C is the specific heat of the metalCO
2 points
If there are 17.0 Liters of a gas in a balloon and the balloon expands to occupy a volume of 38.0 Liters with an initial pressure of 3.5 atm, what was the final pressure?
0.63 atm
Scientists recently discovered that firing low-energy particles at potatoes keeps the potatoes
from developing unwanted sprouts. They observed that these energy particles prevent cell
division in the sprouts. This stops the potatoes from sprouting for up to 120 days. How will this
development most likely affect the potato industry?
Answer:
By allowing the potatoes to be stored longer so they can be sold during winter months.
Explanation:
Since low energy particles are fired at the potatoes to prevent them from developing unwanted sprouts, it means that it prevents sprouts from growing on the potatoes.
Now, winter is wet period which encourages more growth of the sprouts. Thus, the way this development will affect the industry is that the potatoes will be stored for longer period and then sold in the winter.
Determine the net number of sigma bonds, the net number of pi bonds, and the overall bond order for N2+. Use 0.5 to indicate a fractional bond order.
Answer:
Net number of sigma bonds = 1
Net number of pi bonds = 2
Overall bond order = 3
Explanation:
Electronic configuration of N2 ia
1s2 2s2 2p3
There is head to head overlap in pz orbital. Thus, there is one sigma bond
Pi bond is formed whenever there is side wise overlapping. Since both px and py undergoes overlapping to form pi bond, there are two pi bonds
Bond order = 0.5 (bonding electron – antibonding electron)
= 0.5 (8-2) = 0.5*6 = 3
Answer:
Use 0.5 to indicate a fractional bond order.
σ bonds = 0.5
π bonds = 2
overall bond order = 2.5
Explanation:
trust me bro
n today's experiment, Solutions A and B are prepared as follows. Solution A: Solution B: 2.0 mL of 3.00 x 10-4 M bromcresol green 2.0 mL of 3.00 x 10-4 M bromcresol green 5.0 mL of 1.60 M acetic acid (HAc) 2.0 mL of 0.160 M sodium acetate (NaAc) 2.0 mL of 0.200 M KCl diluted to a total volume of 50 mL diluted to a total volume of 50 mL How many mL of Solution A must be added to Solution B to give a buffer that is equimolar in HAc and Ac-
Answer:
2 mL of Solution A must be added to Solution B to give a buffer that is equimolar.
Explanation:
Given the data in the question;
First we determine the number of sodium acetate;
⇒ molarity × volume ( L )
⇒ 0.16 × 2.0 mL
⇒ 0.16 × 0.002 L
⇒ 0.00032
Now, Molarity of sodium acetate = moles / Volume(L)
⇒ ( 0.00032 / 50 ) × 1000
⇒ 0.0064
Since number of moles of acetic acid that should be added tp make equimolar solution is 0.00032
and Molarity of acetic acid is 0.16 molL⁻¹
Let X represent the volume that should be added.
so;
Molarity = Moles / Volume (L)
we substitute
0.16 = (0.00032 / X) × 1000
0.16 = 32 / X
X = 0.32 / 0.16
X = 2 mL
Therefore, 2 mL of Solution A must be added to Solution B to give a buffer that is equimolar.
2x²=8.pls help me i really need it
Explanation:
2x²=8
x²=8/2
x=√4
x=2
hope it helps.
Answer:
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[tex] {2x}^{2} = 8 \\ {x}^{2} = \frac{8}{2} \\ {x}^{2} = 4 \\ x = \sqrt{4} \\ x = 2[/tex]
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