Answer:
-2911 kJ
Explanation:
Step 1: Given data
Heat absorbed by the system (Q): 599.0 kJ (By convention, when the systems absorbs heat, Q > 0)Work done by the system on the surroundings (W): -3510 kJ (By convention, when the systems does work on the surroundings, W < 0)Step 2: Calculate the change in the internal energy (ΔE)
We will use the following expression.
ΔE = Q + W
ΔE = 599.0 kJ + (-3510 kJ) = -2911 kJ
If a small pig runs 46 meters in 6 seconds, what is the pig's average speed?
6 m/s
276 m/s
7 m/s
48 m/s
Answer:
the pig's average speed is 7 m/s
The average speed of a moving body is the ratio of the distance travelled to the time of travel. Here, the speed of the pig running 46 meters in 6 seconds is 7.6 m/s.
What is average speed ?The speed of an object is a physical quantity that measures the distance travelled by the object per unit time. Hence, it is the ratio of distance travelled to the time taken for the travel. The rate of speed is called velocity. Bot are having the standard unit of m/s.
Given that,
distance covered by the pig = 46 meters
time taken = 6 seconds
speed = distance/time.
Average speed of the pig = 46 meters/ 6 seconds = 7.6 m/s.
Therefore, if the small pig runs 46 meters in 6 seconds, it is having an average speed of 7.6 m/s.
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Please help. ASAP!
What most likely happens when water loses heat?
It changes into ice.
It changes into vapor.
Its temperature increases.
Its temperature remains constant.
Answer:
It changes into ice.
Explanation:
solid form of water. When water vapor in the atmosphere cools down, it will condense and change back into liquid water, forming clouds
Answer:
It changes into ice,
Explanation:
Because if it's hot it would melt or evaporate, but if it's LOSING heat it would mean the opposite, and the only one that supports this is that "it changes into ice". Hope this helped, sorry i wasn't on for some time
name any
three kinds of mixtures with example
Answer:
Here are a few more examples:
Smoke and fog (Smog)
Dirt and water (Mud)
Sand, water and gravel (Cement)
Water and salt (Sea water)
Potassium nitrate, sulfur, and carbon (Gunpowder)
Oxygen and water (Sea foam)
Petroleum, hydrocarbons, and fuel additives (Gasoline)
Heterogeneous mixtures possess different properties and compositions in various parts i.e. the properties are not uniform throughout the mixture.
Examples of Heterogeneous mixtures – air, oil, and water, etc.
Examples of Homogeneous mixtures – alloys, salt, and water, alcohol in water, etc.
Explanation:
Answer:
smog,mud, cement?
Explanation:
Smoke and fog (Smog)
Dirt and water (Mud)
Sand, water and gravel (Cement)
need this ASAP
Which of these must be FALSE, in order for evolution by natural selection to occur?
A. Variation between individuals exists in a population.
B. Particular variations of traits are passed on from one generation to the next.
C. Resources are limited, leading to competition within the population.
D. The particular traits present in one generation have no effect on traits in the next generation.
thank you :D
The molecular weight for this compound is 60.09 g/mol. What is the molecular formula for this compound?
Answer:
i i cant help youu withh thatt srry i i juss dont knoww whatt to say !!!!! GO TO SOCRATICCC ..!!!!!!!!!!!!!$$!$!
A student pours 800.0 mL of a 3.000 molar solution of sodium hydroxide into a 2.00 liter volumetric flask and fills the flask up with water. What is the new molarity of the solution?
5 points
12.00 M
1.20 M
14.00 M
0.0750 M
What is the phase label on H3O+(?)
A. aq
B. s
C. e
D. g
E.
How many grams of oxygen are needed to burn 10.0 moles of C3H8?
True or false, rewrite it to make it true.
To balance a chemical equation, only the subscripts of a reactant and product can be changes
Answer:
false
Explanation:
The worst feeling is when you are hurting so badly inside but not a single tear comes out.
Anyone relate?
I know i can.
Answer:
chemistry wow
Explanation:
describe an example of abiotic conditions and give an example.
Answer:
Abiotic does not mean dead. It means never alive.
Examples of abiotic factors are rocks. weather
Explanation:
because
Aqueous hydrochloric acid HCl will react with solid sodium hydroxide NaOH to produce aqueous sodium chloride NaCl and liquid water H2O. Suppose 15.7 g of hydrochloric acid is mixed with 27. g of sodium hydroxide. Calculate the maximum mass of sodium chloride that could be produced by the chemical reaction.
Answer:
25.155 gram
Explanation:
HCl(aq.) + NaOH(aq.) ⇒ NaCl + H2O
According the above equation equal number of moles of reactant are producing same number of moles of products.
Now, no. mole of HCl = 15.7/(1+35.5) = 0.43 moles
no. of moles of NaOH = 27/(23+16+1) = 0.675 moles
Since the amount of sodium hydroxide exceeds the amount of hydrochloric acid, the maximum amount of each substance participating in the reaction is HClν ν 0.43 moles .Therefore, the maximum amount of NaCl that can be produced is as follow
= (23+35.5)×0.43 = 25.155 gram
A 20.06-mL sample of hydrochloric acid solution requires 25.00 mL of 0.149 M sodium hydroxide for complete neutralization. What is the concentration of the original hydrochloric acid solution?
Answer:
The concentration of the original hydrochloric acid solution is - 0.1856 M
Explanation:
Lets calculate-:
Neutralization reaction follows dilute principle
[tex](N_1)(V_1)=(N_2)(V_2)[/tex] For titration between NaOH and HCl
[tex](M_1)(V_1)_H_C_l=(M_2)(V_2)_N_a_O_H[/tex]
Putting the given values ,
[tex]M_1\times 20.06ml=0.149M\times25.0ml[/tex]
[tex]M_1_H_C_l=\frac{0.149\times25.0}{20.06}[/tex]
= 0.1856 M
Hence , the concentration of hydrochloric acid solution is 0.1856 M.
Question 7
3 pt:
N2 + 312 --> 2N13
If 81.3 grams of lodine is reacted with 4.49 grams of nitrogen what is the theoretical yield?
(Include the correct number of significant figures but no units)
Question 8
Answer:
84.3 g of nitrogen triiodide is the theoretical yield.
Explanation:
Hello there!
In this case, according to the chemical reaction:
[tex]N_2 + 3I_2 \rightarrow 2NI_3[/tex]
It is possible to compute the theoretical yield of nitrogen triiodide by each reactant via stoichiometry as shown below:
[tex]m_{NI_3}^{by\ N_2}=4.49gN_2*\frac{1molN_2}{28.01gN_2} *\frac{2molNI_3}{1molN_2}*\frac{394.72gNI_3}{1molNI_3} =126.55gNI_3\\\\m_{NI_3}^{by\ I_2}=81.3gI_2*\frac{1molI_2}{253.81gI_2} *\frac{2molNI_3}{3molI_2}*\frac{394.72gNI_3}{1molNI_3} =84.29gNI_3[/tex]
Therefore, we infer that the smallest amount is the correct theoretical yield as it comes from the limiting reactant, in this case, diatomic iodine as it yields 84.3 g (three significant figures) of nitrogen triiodide as the theoretical yield; incidentally, nitrogen acts as the excess reactant.
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does anyone know the answer to this
What are similarities and differences between a falling object and a pendulum?
Answer:
The similarity is that they both follow the laws of physics.
In both cases, the motion is opposed by the medium where the object presses through the medium and forces it to part and flow around the object. This creates friction.
If an object is smooth and pointed like a bomb, the friction is minimised. If it is rough with pockets or vertical flat surfaces, the friction is maximised. A parachute presents a round hollow cup face to the flow, maximising friction. This is due to a hole in the top of the parachute.
The difference is the power source. In the vertical direction it is generated by gravity, the force created by the planet. This force is opposed not only by friction but also the difference between the density of the object and the medium surrounding it. If there is a large difference then the acceleration will be large and a high percentage of g.
For example we have a density of 1000 kg/meters cubed and air has a density of 1 Kg per meters cubed, the difference is 999, so we fall at an acceleration of 999/1000 x g. minus the effects of friction.
In the horizontal direction, gravity still opposes the movement creating friction in the vertical direction such as dragging a heavy object on the floor behind you. Force needs to be created horizontally to oppose the friction and to create an acceleration. A balance is soon reached where the acceleration stops and the object is dragged at a constant velocity.
which type of neuron carries impulses from the brain?
Answer:
Using my searching skills, the answer is motor neurons.
Explanation:
Motor neurons carry impulses from the brain and spinal cord to muscles or glands.
Both the sweatshirt and the balloon are negatively charged. They are most
likely to (blank)
one another.
A-give
B-attract
C-repel
D-help
Answer:
B attract
Explanation:
There will be statication
CH4 Structural formulas
Explanation:
Methane = CH4(formula)
14. Explain, in terms of ions, why a 10.0-milliliter sample of 0.10 M NH4Cl(aq) is a poorer conductor of
electricity than a 10.0-milliliter sample of the 0.30 M NH4Cl(aq).
Neeed now
Is wrought iron substitutional or interstitial?
Answer:
interstitial is correct my child
Explanation:
The electron affinity of an element is positive if energy is absorbed during the process of accepting an electron and negative if energy is released during the process. Using the electron configuration of the atom or ion undergoing the addition of an electron, predict whether the electron affinity will be positive or negative for the following reactions, and classify them accordingly.
Atom or ion Electron configuration
Ne 1s22s22p6
Br 1s22s22p63s23p64s23d104p5
Na 1s22s22p63s1
Mg 1s22s22p63s2
Cl 1s22s22p63s23p6
Answer:
See explanation
Explanation:
Ne is a noble gas. It already has an octet of electrons hence, the electron affinity of neon is negative.
Br is a halogen, halogens need one electron to complete their octet. The electron affinity for bromine is negative.
Sodium is a metal that has only one electron in its outermost shell. The electron affinity of sodium is positive.
Magnesium is a metal having two electrons in its outermost shell. The electron affinity of magnesium is positive.
Chlorine is another halogen, energy is released when an electron is added to chlorine hence the electron affinity of chlorine is negative.
Which type of light would make an object appear larger and closer?
Answer:
A convex lens bends light rays inward, which results in the object being perceived as larger or closer.
Explanation:
The light ray refracted from an object may look different based on how they bends light and at what angle. Convex lens bends light inwards and the refracted light appear closer and bigger whereas, a concave lens makes light ray away and smaller.
What is refraction?Refraction is the optical phenomenon by which a light ray bends in its direction when passing from one medium to the other. For instance light ray bends when it pass from air to water or air to glass and vice versa.
The measure of bending of light in a medium is called refractive index of that medium. Refraction makes the object appear to be closer sometimes such as in water when light bends in direction.
When light refracts from convex lens, the bending is inwards and the object is perceived to be closer and larger. Whereas, a concave lens make the bending outwards where the object appeared to be smaller and far.
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Help plzz pick on the picture
Which factor has the greatest effect on object X remaining in its orbit?
A:The size of Earth compared to object X
B:The gravitational force between the Earth and object X
C:The gravitational force between the Sun and object X
D: The magnetic field between the Sun and object X.
Explanation:
Stop cheating and use your brains kiddos
Consider the Fischer ester synthesis of methyl benzoate from benzoic acid and methanol in the presence of sulfuric acid as a catalyst. A reaction was performed in which 3.8 g of benzoic acid was reacted with excess methanol to make 2.0 g of methyl benzoate. Calculate the theoretical yield and percent yield for this reaction.
Answer:
48.8%
Explanation:
The reaction has a 1:1 mole ratio so;
Number of moles of benzoic acid reacted = mass/molar mass = 3.8 g/122.12 g/mol = 0.03 moles
So;
0.03 moles of methyl benzoate is formed in the reaction
Mass of methyl benzoate formed = 0.03 moles * 136.15 g/mol = 4.1 g
percent yield = actual yield/theoretical yield * 100/1
percent yield = 2.0 g/4.1 g * 100 = 48.8%
Match each object to its definition.
A. meteorite
B. meteoroid
C. meteor
->
1. The remains of a rock from space that strikes Earth’s surface
2. A rock that burns up in Earth’s atmosphere
3. A small piece of rock in space
Answer:
definition 1. goes with B. meteoroid
definition 2. goes with C. meteor
definition 3. goes with A. meteorite
Answer: meteoroid - a small piece of rock in space, meteor - a rock that burns up in Earths atmosphere, meteorite - The remains of a rock from space that strike Earth's surface.
Explanation:
Which simple machine is best used to split apart an object
A. A screw
B. A lever
C. A wedge
D. A pulley
Answer:
its A screw :))) your welcome
Compare and contrast the way energy can transfer from one object to another.
Answer:
Energy is transferred from the hotter object to the cooler one, and the difference in temperature between them decreases.Explanation
Which of the following safety devices ensures that electricity will flow through it when flowing "downhill" instead of through people? A. Surge protectors B. Electric generators C. Ground wires D. Special plugs for high-current devices
Answer:
Ground Wires
Explanation: