Answer:
no lo sé bb 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100
when a coil of wire is connected to a batter, an electric current flows through it. True or False
Answer:
True i think.
Explanation:
Most chemical reactions have what
Answer:
The first one
Explanation:
Hope it helps
Answer:
I think it would be: have starting substances that collide with each other
Explanation:
Two or more reactants interact to create different substances called products.
A closed container has 5.60 x 1023 molecules of oxygen gas (O2). How many moles is that?
1. What is temperature?
2. How do temperatures change?
3. What affects the temperature of a system?
4. How are temperature and molecular motion related?
5. How is molecular motion related to kinetic energy?
Answer:
1. não entendi
.
3. não entendi
4. não entendi e
5. não entendi
2. não entendi
rysor
Explanation:
Answer:
here...
Explanation:
1 - Temperature is a quantitative measure of how hot or cold something is. Temperature is fundamentally linked to the kinetic energy of atom-scale particles. The Celsius scale is based on the older centigrade scale, adapted slightly to take account of the absolute temperature scale, measured in kelvins, symbol K.
2- Increasing the temperature will cause chemical changes to occur faster. Decreasing the temperature, causes the particles to lose energy which causes them to move around less and slower. The less they move, the less collisions occur, and the less reactions occur between the chemicals = slower reaction rate.
3- When a system absorbs or loses heat, the average kinetic energy of the molecules will change. Thus, heat transfer results in a change in the system's temperature as long as the system is not undergoing a phase change.
4- As the temperature increases, the kinetic energy of the molecules of the liquid increases. The movement of the molecules gradually overcomes forces of attraction between the molecules, with the result that they have greater freedom to move, over greater volumes.
5- The kinetic molecular theory of matter states that: Matter is made up of particles that are constantly moving. Molecules in the solid phase have the least amount of energy, while gas particles have the greatest amount of energy. The temperature of a substance is a measure of the average kinetic energy of the particles.
as the train rushes down the hill the kinetic energy of the train _____ and the gravitational potential stored between the train and earth ________
2 X(9) + Y (9) = 2XY (9)
A reversible reaction is represented by the equation above. The amounts of reactants and products at time 1 are shown in the particle diagram on the left. The particle diagram on the right shows the
amounts of reactants and products at time 2. Based on the diagrams, what can be inferred about the relative rates of the forward and reverse reactions between time 1 and time 2?
a. nothing can be inferred because the total number of X and Y atoms is the same
each diagram
b. Nothing can be inferred because the temperature of the system may have been changed
c. The rate of the reverse reaction is greater than the rate of the forward reaction
d. The rate of the forward reaction is greater than the rate of the reverse reaction.
Answer:
The answer is D. The rate of the forward reaction is greater than the rate of the reverse reaction.
Explanation:
The forward reaction rate was greater than the reverse reaction rate because more product is present at time 2. This is the answer from ap classroom.
The given reaction has been inferred the increased rate of forward reaction than reverse reaction. Thus, option D is correct.
The chemical reaction has been given by the combination of reactants for the formation of product. The reactants combine in the fixed proportion to form the product.
The rate of reaction has been defined as the rate of formation of product or the disappearance of reactants.
Rate of reactionThe forward reaction has been given as the rate of formation of product. The reverse reaction has been given as the rate of dissociation of product.
In the given condition, the number of reactant at time 1 are more than the reactant at time 2. This states that there has been increased formation of the product at time 2.
Thus, the given reaction has been inferred the increased rate of forward reaction than reverse reaction. Thus, option D is correct.
Learn more about reverse reaction, here:
https://brainly.com/question/8592296
PLEASE HELP MEEEEEE< ;-(
1.What is the amount of aluminum chloride produced from 40 moles of aluminum and 40 moles chlorine?
2.What is the amount of aluminum chloride produced from 80.0 grams of aluminum and 80.0 grams chlorine?
Answer:
= 0.4448 mol
Explanation:
id.k frfr
blance: Mg + HNO2 → Mg(NO2)2 + H2
Explanation:
Mg + 2HNO2 → Mg(NO2)2 + H2
Answer:
Mg + 2HNO2 → Mg(NO2)2 + H2
Explanation:
Chemistry question on enthalpy HELP!!!!
Answer: The enthalpy change for this reaction is, -803 kJ
Explanation:
The balanced chemical reaction is,
[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(g)[/tex]
The expression for enthalpy change is,
[tex]\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)][/tex]
[tex]\Delta H=[(n_{CO_2}\times \Delta H_{CO_2})+(n_{H_2O}\times \Delta H_{H_2O})]-[(n_{O_2}\times \Delta H_{O_2})+(n_{CH_4}\times \Delta H_{CH_4})][/tex]
where,
n = number of moles
Now put all the given values in this expression, we get
[tex]\Delta H=[(1\times -394)+(2\times -242]-[(2\times 0)+(1\times -75)][/tex]
[tex]\Delta H=-803kJ[/tex]
Therefore, the enthalpy change for combustion of methane is, -803 kJ
Question 13 (3 points)
.Which one of the following is not a scientific variable?
independent
statement
O control
dependent
When developing a product such as cookware specific heat well as health cost and ease of use our important factors to consider one of the materials tested which is the best suited for cookware and why explain based on safety/health cost specific heat and ease of use
Answer:
In short, the thermal conductivity of a material is how readily that material absorbs and transmits (releases) energy. When the fire or heating element of a range comes in contact to a pan, the energy from the heat source is transmitted to the pan. This increases the internal kinetic energy of the pan (commonly called "heating up"). The heated material then transmits the energy to nearby materials that are at a lower average molecular kinetic energy level (at a lower temperature than the material). The higher the thermal conductivity of the material, the faster it will heat up and also, the faster the heated area will spread to unheated areas of the same piece of material.
For example, if we placed a large sheet of stainless steel (fairly low thermal conductivity as cooking materials go) on a burner and turned on the burner, the area directly under the burner would get hot while the rest of the sheet slowly heats up. The burner imparts heat quickly only to the region of steel directly over it. The rest of the pan heats up from the conduction of the heat from that spot. When the outer edges of the sheet have reached a hot temperature, the spot directly over the burner would be extremely hot. The figure below shows an example of the temperature of the sheet of steel over a gas burner. The hottest parts are shown in white, hot is red and cool is blue.
Explanation:
No explanation hope i'm not wrong
Express the percent composition of each
element in C10H8.
Answer:
Element Symbol Mass percent
Carbon C 93.7088
Hydrogen H 6.2912
Pls help me with this question: This diagram represents the process of?
A.selective breeding
B.natural selection
C.metamorphosis
D.germination
Answer:
A
Explanation:
Selective Breeding
Is your answer because if you look closely to the pic you see the process
Hope this helps:)
Pls mark brainlist
Answer:
A
Explanation:
Hello can someone pls help me with this question! (Please explain why)
QUESTION: How is an increase in surface area achieved?
A. increasing the size of the reactant particles
B. decreasing the size of the reactant particles
Answer:
letter A.
Explanation:
the rate of a chemical reaction can be raised by increasing the surface area of a solid reactant. this is done by cutting the substance into small pieces, or by grinding it into a powder.if the surface area of a reactant is inceased: more particles are exposed to the other reactant.
HOPE IT HELPS(◍•ᴗ•◍)❤
"Is air pollution related to lichen growth?"
What is a likely hypothesis for the question?
A. Air pollution must affect lichen growth.
B. No, air pollution does not affect lichen growth.
C. If air pollution is high, then lichen growth is high.
D. If air pollution is high, then lung disorder cases are high.
Air pollution must affect lichen growth because lichens have no roots they get all their nutrients from the air. If the air has pollutants that can become toxic for lichens.
What are lichens?A lichen can be described as a composite organism that arises from algae or cyanobacteria living among filaments of fungi species in a mutualistic relationship. Lichens have different properties that come in many colors, sizes, and forms.
A macro lichen can be defined as a lichen that is either bush-like or leafy. Lichens do not have roots therefore they absorb water and nutrients as plants do but like plants, they form their own nutrition by photosynthesis.
If lichens are exposed to air pollutants they are unable to avoid the accumulation of air pollutants. Because lichens possess no roots, their primary source of most nutrients is the air.
Lichen decline can be because of the accumulation of toxic substances as well as altered nutrient supplies that favor one symbiont over the other. Therefore, option (A) is correct.
Learn more about Lichens, here:
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If a 67.3G rock is dissolved in 2.00L of acid, what is the molar concentration of gold in the acid solution
Answer:
[Au] = 0.171 M
Explanation:
For this question, we assume the rock is 100 % gold.
First of all, we determine the moles of gold
67.3 g . 1mol/ 196.97g = 0.342 moles
Molar concentration is defined as the moles of solute, contained in 1L of solution.
Our solution volume is 2L.
M = 0.342 mol / 2L = 0.171
Molar concentration, also called molarity of solution is the most typical unit of concentration.
9.
Which element is most likely to conduct heat and electricity?
A. Na B. Ca C.P D. Ne
Answer:
A. Na
Explanation:
Sodium is a good conductor of electricity and heat because it has only one electron in its valence shell.
i hope this helps :)
Answer:
C.) P
Explanation:
I believe this is correct, lmk if it's not.
FOR 40 points!!!! I need the whole page finish !!!!!! Pleaseeeeee!!!!!!! I will five u brainlist !!!!!!
PPPPPPPPLLLLLLLLLSSSSSS HHHHHHEEEEEELLLLPPPPP!!!!!!!!!!!!!!
Answer:
B
Explanation:
The student is not able to move the box in D --> 55N, 0N. Since the net force is 0, it means that no force is being applied. So you will choose answer B from your options.
Hope this helps, thank you !!
4 points
9. Name the scientists that played a major role in the development of cell theory. *
QUICK!!!! please
Which of the following dilutions would produce 2.0M acid from 3.0M acid
A) 3.0mL acid and 2.0mL water
B) 2.0mL acid and 1.0mL water
C) 2.0mL acid and 3.0mL water
D) 1.0mL acid and 2.0mL water
Answer:
that's a difficult question
Explanation:
Sorry!!!!!
___________ is the least reactive metal.
i. Silver
ii. Iron
iii. Gold
iv. Sodium
DUE IN 10 MINUTES PLZZZZ
Part IV: True/False
____ 38. The mass of the nucleus is small compared to the mass of the atom.
____ 39. Alpha particles would be harder to turn than Beta particles.
____ 40. Positive charge was spread all throughout the atom in the Rutherford Model.
____ 41. The Manhattan Project was located in New York for most of its duration.
____ 42. The cathode rays produced by Thomson were identical for all filaments.
____ 43. It is possible to know where an electron is and what path it is on.
____ 44. X-rays are produced when fast moving electrons strike phosphor coatings.
____45. All nuclear changes involve at least two reactants.
Answer:
true false true false true fake
Answer:
38. False
39. True
40. True
41. True
42. False
43. False
44. True
45. True
Explanation:
Note these are just my guesses they might not all be correct but I will do my best.
Hope this helps you at all! Feel free to correct me if I got any of them wrong :)
Which family group on the peirodic table has the most elements
a. metals
b. nonmetals
c. trainsiton elements
d. metalloids
Answer:
C. Transition metals
Explanation:
Out of the answers transition metals have the most elements on the periodic table.
How many miles will a person run a 400 km race?
Answer:
248.548
Explanation:
need points & are good at science?
Answer:
A
Explanation:
I believe the Correct answer would be A
Predict the shape of the molecule around the
indicated atom.
A. linear
B. trigonal planar
C. tetrahedral
D. bent
If I add a proton to an atom, which of the following will change? (select all that apply) a)the type of element b)The mass of the atom c)The charge of the atom d)The number of neutrons)
As you climb through the upper stratosphere, the temperature: increases decreases in constant
Answer:
It increases.
Explanation:
I hope this helps.
Answer:
Increases
Explanation:
Hope this helps :)
1. According to the equation, what mass of hydrogen fluoride is necessary to produce 2.3 g of sodium fluoride?
HF + NaNO3 -> HNO3 + NaF
Answer:
1.09 grams
Explanation:
According to the following chemical equation:
HF + NaNO₃ -> HNO₃ + NaF
1 mol of hydrogen fluoride (HF) produces 1 mol of sodium fluoride (NaF). Thus, we first convert from mol to grams by using the molar mass (MM) of each compound:
MM(HF)= (1 g/mol x 1 H) + (19 g/mol x 1 F) = 20 g/mol HF
1 mol HF x 19.9 g/mol HF = 20 g
MM(NaF) = (23 g/mol x 1 Na) + (19 g/mol x 1 F) = 42 g/mol NaF
1 mol NaF x 42 g/mol NaF = 42 g
Thus, from 20 g of HF are produced 42 g of NaF ⇒ 20 g HF/42 g NaF. We multiply this stoichiometric ratio by the mass of NaF produced to calculate the required mass of HF:
20 g HF/42 g NaF x 2.3 g NaF = 1.09 g HF
Therefore, 1.09 grams of HF are necessary to produce 2.3 g of NaF.