Answer:
28.83dm³
Explanation:
Using ideal gas equation
PV=nRT
P=2.80atm
n=2.30
R=0.082
T=155°C (155+273=428Kelvin)
V=nRT/P
V=2.30×0.082×428/2.80
V=28.83dm³
How much energy (in J) is required to raise the temperature of 19.2 g of water by 5.00 oC? (Specific heat capacity of liquid water: 4.184 J/g⋅°C)
Its chemical formula is C17H19NO3. What percent, by mass, is carbon in this compound?
A rubber ball is held 4.0 m above a concave spherical mirror with a radius of curvature of 1.5 m. At time equals zero, the ball is dropped from rest and falls along the principal axis of the mirror. How much time elapses before the ball and its image are at the same location?
The time elapsed when the ball placed above the concave mirror and the image formed would be at the same location is 0.55 s.
Image distanceThe position of the image formed is determined using the followimg mirror formula;
[tex]\frac{1}{f} = \frac{1}{v} + \frac{1}{u}[/tex]
where;
f is the focal length of the mirrorv is the image distanceu is the object distancef = R/2
f = 1.5/2
f = 0.75 m
When the ball and its image is in the same position, u = v
The position of the ball is calculated as;
[tex]\frac{1}{f} = \frac{1}{u} + \frac{1}{u} \\\\\frac{1}{f} = \frac{2}{u} \\\\u = 2f\\\\u = 2(0.75)\\\\u = 1.5 \ m[/tex]
Time of motion of the ballThe time taken for the ball to travel the caluclated distance is determined as;
h = ut + ¹/₂gt²
1.5 = 0 + ¹/₂(9.8)t²
1.5 = 4.9t²
t² = 1.5/4.9
t² = 0.306
t = 0.55 s
Thus, the time elapsed when the ball and its image are at the same location is 0.55 s.
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The Molar mass of silicon is 28.09 grams/mole
Calculate the number of atoms in a 92.8 mg sample of silicon
Write your answer in scientific notation using three significant figures
A student with a cold experiences a fever. The fever results directly from the activity of which body system?
A: Respiratory
B: Immune
C: Circulatory
D: Skeletal
Answer:
its prob B since thats the system that protects the body from harmful substances
Explanation:
Answer:
B since that's the system that protects the body from harmful substances.
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2.1 Interpret the results based on your understanding. Indicate deficiencies and excesses. (20)
2.2 How will you correct the deficiencies and/or excesses found in this soil?
Soil nutrients are minerals which are required for growth either small or relatively large quantities
What are soil minerals?Soil minerals are the metallic and non-metallic nutrients found in the soil which are required by plants for growth.
Based on plants requirements, the major nutrients are nitrogen, phosphorus and potassium.
Plants also require other nutrients like copper, zinc, sulfur, iron, etc., in smaller quantities.
Based on the results of the soil test:
The deficiencies nutrients are copper and potassium The excess nutrients are phosphorus, sulfur, iron and zincThe deficiencies and excesses can be corrected by selectively reducing the application of the excess soil nutrients and addition of the deficient nutrients.
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(ii) Explain why magnalium is harder than aluminium.
Answer:
Magnalium is stronger than aluminium alone but still has a low density.
Explanation:
what is galvanization
What is the theoretical yield of sodium chloride for the reaction of 55.0 g of Na
D
with 67.2 g Cl2?
g
a. 1.40 x 102 g NaCl
b. 111 g NaCl
c. 55.4 g NaCl
222 g NaCl
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Actually Welcome to the concept of Physical chemistry, and Stochiometry.
So we balance the equation as,
2Na + Cl2 ===> 2NaCl
The required reaction is as:
2Na+ Cl2 = 2NaCl
2 moles Na = 2×23 g = 46g,1 mole Cl2 = 2×35.5g=71g
Now,71g Cl2 reacts with 46g Na,
Therefore, 67.2g Cl2 reacts with 46×67.2/71= 43.54g Name
The rest Na = (55–43.54)g=11.46g
That means Cl2 is a limiting reactant.
Again,2 moles NaCl=2(23+35.5)g=117g
Then,71g Cl2 produce 117g NaCl
Therefore,67.2g Cl2 produce 117×67.2/71 = 110.74g NaCl
hence the correct option is, b.) 111 g NaCl
If two metals had the same specific heat, how can we distinguish them in two ways?
Answer:
Specific heat is an intensive property (like density, color, etc.) that does not depend on the amount of a substance present. This allows substances to be identified using their specific heat. Imagine an unknown metal of known mass is heated to a known temperature.
Explanation:
what is the empirical formula of a cpd containing 60.0%of sulfur 40.0% oxygen by mass
Answer:
n S = 60 32 = 1.875 , n_S=\tfrac{60}{32}=1.875, nS=3260=1.875, n O = 40 16 = 2.5.
Explanation:
A gas made up of homonuclear diatomic molecules escapes through a pinhole 0.378 times as fast as He gas. Write the chemical formula of the gas.
For a gas made up of homonuclear diatomic molecules escapes through a pinhole 0.378 times as fast as He gas, the chemical formula of the gas is mathematically given as
N2(nitrogen gas)
What is the chemical formula of the gas.?Generally, the equation for the rate to molar relationship is mathematically given as
\frac{r1}{r2}=\frac{mm2}{mm1}
Thereofore
\frac{r}{r2}=0.378
Hence
0.378=\sqrt{\frac{4.00268}{Mx2}}
Mx2=28.013g/mol
In conclusion,The name of gas with a molar mass of 28.013g/mol is N2
Therefore, the chemical formula of the gas. is N2
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use the equation:
2C6H6 + 1502 →12CO2 + 6H20
Calculate the number of moles of oxygen required to react with 5.00 moles of C6H6.
Show steps
Answer:
37.5 moles of O2 needed
Explanation:
2 moles of C6H6 need 15 moles of O2
5/2 * 15 = 37.5 of O2 needed
Giving Brainliest!
Wetlands filter and clean water flowing through them. In the system shown in the diagram, the wetland cleans water entering the ocean by which means?
A: Run-off
B: Precipitation
C: Evaporation
D: Condensation
Answer:
im guessing its A run off
Explanation:
Answer: Run off
Explanation:
Wetlands have plants that clean water through. As water flows into a wetland it encounters the the plants growing there. This slows the water down making it less likely to cause erosion. The nutrient pollutants nitrogen and phosphorus are absorbed by the roots of the plants.
.
...............................
Answer:
F is correct
Explanation:
When an atom or group of atoms" has more protons than electrons",it is positively charged. An atom or group of atoms that has the same number of protons and electrons is neutrally charged.
Answer: If an object that has an excess of positive electrons it is a positively charged object.
What is the pressure exerted by a force of 14.7 N over an area of 0.00482 m²?
Answer:
[tex]p= \frac{F}{A} = \frac{ 14.7 }{0.00482} = 3050 \: Pa[/tex]
1. Which statement is always true when nuclear fusion occurs?
A. The number of protons in the resulting nucleus is less than in each starting nucleus.
B. The number of protons in the resulting nucleus is double that of a starting nucleus.
C. The combined number of portions and neutrons remains constant.
D. The total number of protons and neutrons in each nucleus remains constant.
•
2. Use the equation to answer the question.
2H + 2H—> 4H + energy
1 1 2
Which statement best describes the mass numbers of the atoms in the reaction?
A. There are two atoms with mass numbers of 2.
B. There is one atom with
a mass number of 2.
C. There are two atoms with mass numbers of 1.
D. There is one atom with a mass number of 1.
•
3. How is the mass number calculated for an atom involved in nuclear fusion?
A. It is the number of electrons.
B. It is the number of protons plus electrons.
C. It is the number of neutrons.
D. It is the number of protons plus neutrons.
•
4. Which change will always take place in nuclear fusion?
A. The total charge will be less than before the fusion took place.
B. The nucleus with a smaller mass than any of the reactants will be produced.
C. A nucleus with a greater mass than any of the reactants will be produced.
D. The total charge will be greater than before the fusion took place.
•
5. Which statement best summarizes the way the sun produces energy?
A. Combustion reactions in the sun release large amounts of chemical energy.
B. Fusion reactions in the sun release large amounts of chemical energy.
C. Combustion reactions in the sun convert small amounts of matter into large amounts of energy.
D. Fusion reactions in the sun convert small amounts of matter into large amounts of energy.
Answer:
1. The combined number of protons and neutrons remains constant.
2. There are two atoms with mass numbers of 2.
3. It is the number of protons plus neutrons.
4. A nucleus with a greater mass than any of the reactants will be produced.
5. Fusion reactions in the sun convert small amounts of matter into large amounts of energy.
What is the electro negativity difference for CO ?
The electronegativity of carbon is about 2.5 , and that of oxygen is about 3.5 , and naturally, (3.5−2.5=1.0)>0 . So, the electronegativity difference is greater for a C−O single bond than a F−F single bond.
Answer:
1.0
I hope my answer helps you.
Brainliest
Which choice is an example of the use of sound energy in everyday life?
batteries powering toys
fireplaces keeping people warm
lights helping people see
car horns preventing accidents
Answer:
car hornsss
Explanation:
they loud asl
What mass of water is in a calorimeter where 225.0 J of heat are
transferred to the water from a heated piece of metal and the
temperature of the water is increased by 4.00°C?
Answer:
22.25 °C
Explanation:
Determine the final temperature when a 25.0 g piece of iron at 85.0 °C is placed into 75.0 grams of water at 20.0 °C.
Which of the following states is NOT true with regards to the expansion of slavery into the western territories?
1The Wilmot Proviso aimed at prohibiting slavery in any territory that would be won from Mexico. It was not passed by Congress, but it wc
territories for the next fifteen years.
2The idea of letting white settlers decide if the territories they moved to would be free or slave was known as popular sovereignty.
3The whig candidate for president in 1848, war hero Zachary Taylor, had no party affiliation and had never himself voted in a presidential ele
4 The Free Soil party, which
nominated former president Martin Van Burn in 1848, wanted to abolish slavery in the USA, to make the countr
Answer:
what I don't understand anymore JJ is the best thing I think it's help with that I hope it's a pako I will be there in about a
Which action would shift this reaction away from solid silver chloride and toward the dissolved ions
Na
Η Ο
Is this an element or a compound?
Answer:
compound
Explanation:
because h is hydrogen, then O is oxygen
what mass of water must be added to 0.50 mol of glucose to make a solution of 25 percent by mass? the molar mass of glucose is 180 g/mol. SHOW WORK PLSS.
Answer:
270 g of water
Explanation:
given scientific reason for Nacl dissolves in water
Answer:
Matter is made-up of minute particles. Minute particles of matter have space between them.
So, when common salt is added to water, the particles of salt get into the space between particles of water.
Hence, common salt (Table salt) dissolves in water.
possible cause of water hammering?
Answer:
At home, a water hammer may occur when a dishwasher, washing machine or toilet shuts off water flow. The result may be heard as a loud bang or repetitive banging since the shock wave travels back and forth in the plumbing system.
A gas occupies a volume of 1.0 L at 25°C. What volume will the gas occupy at 100°C?
A)
4.0 L
B)
0.80 L
C)
1.3 L
D)
1.0 L
Answer:
A
Explanation:
1.0 L * 4 = 4L volume that the gas can occupy at 100 degree Celsius
How many grams of air are required to complete the combustion of 186 g of phosphorus (M= 31 g/mol) to diphosphorus pentoxide, assuming the air to be 23% oxygen by mass?
4P(s) + 5O2(g) — 2P2Os(s)
Answer:
1043.5 g of air to the nearest tenth.
Explanation:
4P + 5O2 ---> 2P2O5
4*31 g P reacts with 5*32 g oxygen
124 g .. .. . .... . 160g oxygen
186 g .. .. .. .. .. (160*186)/124 g oxygen
- so the mass of air required = [(160*186)/124] / 0.23
= 240 / 0.23
= 1043.5 g of air.
What are renewable resources?
Answer:
Renewable sources are something that can be renewed like
Plants
Trees
etc
uh
Explanation:
Non-renewable for example is you cant renew them at all
there built by the earth themselfs
Like
cole
gemstone
Steel
Metal
etc
How to pay taxes I MEAN
The atomic weight of nitrogen is what ?
Explanation:
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Atomic weight of nitrogen is 23
