Transferring charge by touching or rubbing is called-
A) charging by contact
B) convection
C) insulation
D) none of these
Answer:
A) Charging by contact
Explanation:
Transfer of heat by direct contact, Heat energy is conducted from the hotter medium to the cooler medium
Which pair of substances would be easy to separate using distillation?
A. Water and alcohol
B. Suger and salt
C. Oil and water
D. Sand and gravel
Answer: A
Explanation:
do i look phat in this dress?
Answer:
Very!
Explanation:
Very phat!
Balance the equation by putting the correct number in front of each compound. You can work this out mathematically or by drawing pictures on a piece of paper like the videos.
NH3 --> H2 + N2 ammonia dissolving
Answer:
2NH3 --> 3H2 + N2
Explanation:
It's hard to explain how I got these coefficients but I recommend watching Tyler DeWitt on Youttube. He explains tons of chemistry concepts in an easy and clear way. I always watch his videos when I don't understand something.
I would type in "How to balance chemical equation" by Tyler DeWitt
Consider a buffer solution that is 0.50 M in NH3 and 0.20 M in NH4Cl. For ammonia, pKb=4.75. Calculate the pH of 1.0 L of the solution upon addition of 30.0 mL of 1.0 M HCl to the original buffer solution.
Express your answer to two decimal places.
***will mark Brainliest for right answer ***
The pH of the solution is 9.56.
Given:
Mol of NH₃ = 0.50
Mol of [tex]NH_4^+[/tex] = 0.20 to start (NH₄Cl dissolves completely)
Molarity = 1.0 M
30.0 mL of 1.0 M HCl is 0.0300 mol of HCl.
This will react with the NH₃ to produced 0.030 mol of [tex]NH_4^+[/tex] .
Henderson-Hasselbach equation:This equation is used to calculate pH. It is an approximate equation that shows the relationship between the pH or pOH of a solution and the pKa or pKb and the ratio of the concentrations of the dissociated chemical species
pH = pKa + log(base/acid)
pKa = 14 - pKb
pKa= 14 - 4.75
pKa= 9.25
pH = 9.25 + log(0.47/0.23)
pH = 9.56
Thus, the pH of the solution is 9.56.
Find more information about pH here:
brainly.com/question/22390063
PLEASE HELP ILL GIVE BRAINLIEST
What do you think will happen if the experiment from the video kept running? Explain with vocabulary words from the
chapter.tinyurl.com/AMPTE-05
Answer:
Since the temperature of the water made the air hot, i believe that after the video if the experiment continued it would have just made the air a little warmer but not too hot.
Explanation:
Fill in the blanks according to the chemical reaction below to
indicate how many molecules of each substance are present.
N2 + 3H2 + 2NH3
Substance
N2
H2
NH3
Molecules Present (Coefficient)
The molecules or coefficient of N2 would be 1, that of H2 would 3, and that of NH3 would be 2.
From the balanced equation of the reaction:
[tex]N_2 + 3H_2 ---> 2NH_3[/tex]
1 mole of N2 will react with 3 moles of H2 in order to produce 2 moles of NH3. In order words, the mole ratio of N2 to H2 to NH3 in the reaction will always be 1:3:2.
Thus, the coefficient of N2 in the equation will be 1, the coefficient of H2 will be 3, and the coefficient of NH3 will be 2.
More on balancing equations can be found here: https://brainly.com/question/7181548?referrer=searchResults
Answer: 3:2
this is the answer I came up with that was correct after I did the question in ck12
What is the percent composition of aluminum in the ore bauxite (AI2O3)?
Answer:
Molar mass of Al2O3 = 101.961276 g/mol
This compound is also known as Aluminium Oxide.
Convert grams Al2O3 to moles or moles Al2O3 to grams
Molecular weight calculation:
26.981538*2 + 15.9994*3
Percent composition by element
Element Symbol Atomic Mass # of Atoms Mass Percent
Aluminium Al 26.981538 2 52.925%
Oxygen O 15.9994 3 47.075%
Explanation:
Percent composition by element
Element Symbol Mass Percent
Aluminium Al 52.925%
Oxygen O 47.075%
15. What is the molar mass of H2CO3?
(atomic mass: C = 12.01, H = 1.01, 0 = 15.99)
Answer:
62.00
Explanation:
H2 means that there are two moles of hydrogen so multiply the atomic mass by two (1.01 × 2 = 2.02)
C only has one mole sp leave 12.01 alone
And multiply oxygen by 3 because there are three moles of oxygen (15.99 × 3 = 47.97)
Add them all together!
2.02 + 12.01 + 47.97 = 62.00 for molar mass
Can you…Balance a chemical equation using the relationships identified?
Answer:
A balanced chemical equation not only describes some of the chemical properties of substances—by showing us what substances react with what other substances to make what products—but also shows numerical relationships between the reactants and the products.
If 10.0g of powdered iron is heated with 10.0g of sulfur in an open crucible, what is the mass of iron (II) sulfide that is formed? What mass of excess reactant is leftover? The reaction is as follows: Fe+S8–> FeS
Answer:
See Explanation
Explanation:
8Fe + S₈ => 8FeS
Given: 10g 10g
moles 10g/56g/mol 10g/256g/mol
= 0.179mol Fe = 0.039mol S₈
Reduce => divide mole values by respective coefficients; smaller value is Limiting Reactant.
0.179/8 = 0.022 0.039/1 = 0.039
=> Fe is limiting reactant
8Fe + S₈ => 8FeS
Given: 10g/56g/mol 10g/256g/mol
= 0.179mol = 0.039 mol 0.179mol FeS produced
1/8(0.179)mol S₈ used (coefficients are equal,
= 0.022 mol S₈ used => moles Fe = moles FeS)
= (0.039 - 0.022)mol S₈ = 0.179mol FeS
remains in excess =(0.179mol)(88g/mol)
= 0.0166 mol S₈ (excess) = 15.8 g FeS
= (0.0166mol)(256g/mol) (Theoretical Yield)
= 4.26g S₈ in excess
why is no one helping me this is some bs
Which is NOT an assumption of matter made by the kinetic molecular theory of gases?
a. The kinetic energy of particles is determined by their mass and their velocity.
b. Gas particles are widely dispersed and therefore are not affected significantly by attractive or repulsive forces.
c. Gas particles are small and take up little volume relative to the volume of the space around them.
d. When particles collide, their total energy is decreased.
Answer:
There is strong attraction or repulsion between the gas particles.In other words,they strongly interact with each other" is NOT an assumption made by kinetic molecular theory.
The theory that attempts to elucidate the behaviour of gases is known as kinetic molecular theory.
The postulates of kinetic molecular theory of gases are given below,
\bigstarGases consist of large number of identical particles(atoms or moleculesthat are so small and so far apart
\bigstar There is no force of attraction between the particles of a gas at ordinary temperature and pressure
\bigstarParticles of a gas are always in constant and random motion
\bigstarParticles of a gas move in all possible directions in straight lines. During their random motion, they collide with each other and with the walls of the container
\bigstarCollisions of gas molecules are perfectly elastic. This means that total energy of molecules before and after the collision remains same
\bigstarThe average kinetic energy (energy due to motion) of the gas particles is proportional to the temperature measured in kelvin. As temperature increases, the particles move faster and have more energy
\bigstarAt any particular time, different particles in the gas have different speeds and hence different kinetic energies.
\therefore From the above data it is clear that "There is strong attraction or repulsion between the gas particles.In other words,they strongly interact with each other" is NOT an assumption made by kinetic molecular theory.
Explanation:
According to Kinetic theory of gases, the kinetic energy of particles are derived from the temperature and not by their mass and velocity. Hence, option a is not an assumption of kinetic theory of gases.
What is kinetic theory gases ?According to kinetic theory of gases, gases substances are made of tiny particles. These particles when taken in a container have negligible volume compared to the volume of the container.
The collision between the gaseous particles and and between the particles and the wall make the pressure within the container. The kinetic energy of the particles is directly proportional to the temperature of the gas.
According to the theory, the kinetic energy is not determined from the mass and velocity of the particles, but by the temperature of the system. Hence, option a is not an assumption of kinetic molecular theory of gases.
Find more on kinetic theory:
https://brainly.com/question/14349214
#SPJ3
HELP PLEASEEEE!!!!!!!!
Nitrogen (N)) reacts with hydrogen (H) to produce ammonia (NH3). Represent this reaction in terms of:
Particles
b. Moles
C. Mass
Answer:
C the answer is c
Explanation:
ITS C
AN ARRANGEMENT OF ELEMENTS INTO ROWS and columns according to similiarties in their properties
Answer:
Periodic table of elements
Explanation:
The picture below shows xylem and phloem vessels, which are tube-
like structures in a plant's roots and stems. Phloem is adapted for
transporting the glucose made during photosynthesis to the roots and
stems.
Phloem
Xylem } Vascular
stem
τρος
Xylem
Phloem
Which function is xylem specifically adapted to perform in plants?
(7.12A)
A
It helps prevent wer loss
B
It transports water from the roots to the leaves
с
It exchanges gases with the atmosphere
D
It captures sunlight for photosynthesis
Answer:
B
Explanation:
it transports water from roots to the leafs
what happens when
limestone is heated
Answer:
When limestone is heated strongly, the calcium carbonate it contains absorbs heat (endothermic ) and decomposes to form calcium oxide. Calcium oxide (also known as quicklime) is a key ingredient in the making of cement and is also used to make certain types of plaster.
Explanation:
Limestone heated
When limestone is heated strongly, the calcium carbonate it contains absorbs heat (endothermic ) and decomposes to form calcium oxide. ... Calcium oxide (also known as quicklime) is a key ingredient in the making of cement and is also used to make certain types of plaster.
Burning Limestone
Burning limestone, which is calcium carbonate, gives you quick lime, calcium oxide. Mixed with water this produces slaked lime, calcium hydroxide. ... This is soft when first mixed, but with time absorbs carbon dioxide from the atmosphere and hardens as it reverts back to calcium limestone.
Limestone exposed to heat and pressure.
Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. ... Under the conditions of metamorphism, the calcite in the limestone recrystallizes to form a rock that is a mass of interlocking calcite crystals.
When describing a solution, which of the following statements are true:
A) one substance is dissolved into another C) requires chemical separation
B) heterogeneous D) always involves the combination of a solid with a
liquid. E) All of these descriptions are true
Answer:
E) All of these descriptions are true
80 points to whoever ACTUALLY solves ALL 4!!
It has something to do with boyle’s/charle’s/G-L/Combined Gas Laws
I’m super lost and I’ve been working on this for nearly 2 hours!
Answer:
See Explanations
Explanation:
The Empirical Gas Laws include ...
Boyles Law => P₁V₁ = P₂V₂
Charles Law => T₁/V₁ = T₂/V₂
Gay-Lussac's Law => P₁/T₁= P₂/T₂
Avogadro's Law => V₁/n₁ = V₂/n₂
Combined Gas Law => P₁V₁/T₁ = P₂V₂/T₂
Ideal Gas Law => PV = nRT; R = 0.08206 L·Atm/mol·K
One only needs to learn the 'Combined Gas Law' in that it embodies all of the gas law problems.
Start with a simple table for P, V & T and enter given data. If a variable is not given, assume it is constant. Set up P₁V₁/n₁T₁ = P₂V₂/n₂T₂ and substitute given data. Solve for unknown.
Your Problems:
1. P₁ = 1 Atm P₂ = 3 Atm
V₁ = 300ml V₂ = ?
T₁ = Constant T₂ = T₁
n₁ = Constant n₂ = n₁
P₁V₁/n₁T₁ = P₂V₂/n₂T₂
=> (1Atm)(300ml)/(Constant)(Constant) = (3Atm)(V₂)/(Constant)(Constant)
=> (1Atm)(300ml) = (3Atm)V₂
=> V₂ = (1Atm)(300ml)/(3Atm) = 100ml
2. P₁ = 1 Atm P₂ = ?
V₁ = Constant V₂ = V₁
T₁ = 273K T₂ = 82K
n₁ = Constant n₂ = n₁
P₁V₁/n₁T₁ = P₂V₂/n₂T₂
=> (1Atm)(Constant)/(273K)(Constant) = (P₂)(Constant)/(82K)(Constant)
=> (1Atm)/(273K) = (P₂)/(82K)
=> P₂ = (1Atm)(82K)/(273K)
=> P₂ = 0.3 Atm (1 sig-fig)
3. P₁ = 101.25kPa P₂ = 506kPa
V₁ = 5 Liters V₂ = ?
T₁ = Constant T₂ = T₁
n₁ = Constant n₂ = n₁
P₁V₁/n₁T₁ = P₂V₂/n₂T₂
=> (101.25kPa)(5L)/(Constant)(Constant) = (506kPa)(V₂)/(Constant)(Constant)
=> (101.25kPa)(5L) = (506kPa)(V₂)
=> V₂ = (101.25kPa)(5L)/(506kPa)
=> V₂ = 1.00 Liter
4. P₁ = Constant P₂ = P₁
V₁ = 3.2 Liters V₂ = ?
T₁ = 273°C + 273 = 546K T₂ = 400°C + 273 =673K*
n₁ = Constant n₂ = n₁
*Note => be sure to convert all temps to Kelvin when working empirical gas law problems. K = °C + 273
P₁V₁/n₁T₁ = P₂V₂/n₂T₂
=> (Constant)(3.2L)/(Constant)(546K) = (Constant)(V₂)/(Constant)(673K)
=> (3.2L)/(546K) = (V₂)/(673K)
=> V₂ = (3.2L)(673K)/(546K)
=> V₂ = 3.944 Liters ≅ 3.9 Liters (2 sig-figs)
True or False: Tsunamis always look like a towering wall of water approaching the beach.
Answer:
false
Explanation:
Answer:
True
Explanation:
they can get up to several hundreds of feet.
QUESTION 8
DOK 4
Watch later Share
Imagine that an atom of Fluorine (F) can bond with one
of the following atoms. Which one do you think it is
most likely to bond with? Why?
Lithium (Li)
Beryllium (Be)
Boron (B)
Carbon (C)
For more videos,
check out:
Click to answer
ne
T
www.video
chemistry
textbook.com
Youlube
SAVE DRAFT
SUBMIT
13:22 / 16:52
СС
Answer:
Li
Explanation:
F is a strongest electronegative element and it will combine with an element with low electronegativity. From the list provided, the element is Li.
Im not entirely sure how to do this would someone mind answering it for me?
How can sand be classified as individual evidence?
Answer:
Individual Characteristics are properties of physical evidence that can be attributed to a common source with a high degree of certainty. Examples of individual evidence include anything that contains nuclear DNA, toolmarks, and fingerprints.
Explanation:
What is the chemical formula for dinitrogen monoxide?
А
NO
B
NO
С
2NO2
D
N20
Answer:
N20
Explanation:
This pizza is a delicious combination of a bread crust, tomato sauce, cheese, and meat. Like all nutritious foods, this pizza provides energy for all of the body's activities. HELP ME PLS
1. Where do you think the energy in each of these four food groups comes from? How confident are you with your prediction?
Answer: pizza crust, Vegetables, Dairy, Meat, and Dairy
Explanation:
The pizza crust is important, not only to deliver those mouthwatering toppings to your anxiously waiting taste buds, but to provide vital nutrients from grains. Vegetables are a common and delicious topping for pizza. These toppings provide an array of nutrients and including multiple servings of vegetables in your diet every day is a necessary part of a healthy lifestyle. If you get meat on your pizza, it is an excellent source of protein. All meat is high in protein and iron, which are necessary to build muscle. Cheese is a good source of the calcium we all need for strong bones and teeth. Cheese is also a good source of protein.
A bread crust contains carbohydrate, vegetables contains vitamins, cheese contain calcium and protein, meat contain protein.
What are nutrients?Nutrients are the substance that makes a body healthy.
Food material contain different nutrients that help in growth of the body.
In pizza, we get all type of nutrients
A bread crust contains carbohydrate which provide energy.
Vegetable contains vitamins to keep the body parts healthy.
Cheese contain calcium and protein which maintain the growth and repairing of the body.
Meat contain protein, good for muscles.
Thus, A bread crust contains carbohydrate, vegetables contains vitamins, cheese contain calcium and protein, meat contain protein.
Learn more about nutrient, here:
https://brainly.com/question/1268939
What is the formula of cell respiration? (In a science equation)
Answer:
Hey mate....
Explanation:
This is ur answer.....
Equation : Cellular Respiration: C6H12O6 + 6O2 → 6CO2 + 6H2O.
Hope it helps u,
Mark me as the brainliest....
FOLLOW ME!!!!
Answer:
C6H12O6 + 6O2 → 6CO2 + 6H2O.
Explanation:
How are igneous and sedimentary rocks similar? A.They are both formed by erosion. B.They are both formed from cooled lava. C.Heat and pressure can turn them into lava. D.Heat and pressure can turn them into metamorphic rock.
Answer:
D
Explanation:
I learned this last year.
chemical equation Water decomposes into hydrogen and oxygen.
Water is a chemical compound also known as H2O and is composed of two hydrogen atoms (H) and one oxygen atom (O).
2 H2O → 2 H2 + O.
A particular mountain stream is home to a population of salamanders that are red in
color. In the past year, a second population of salamanders that are dark blue in color
moved into the same stream. Scientists researching the stream have recently discovered young salamanders that are red with dark blue patches on their bodies.
What can the scientists conclude from this evidence?
A). The salamanders are suffering from a bacterial disease.
B)..The salamanders are on the verge of becoming extinct.
C). The salamanders undergo asexual reproduction.
D). The salamanders undergo sexual reproduction.
Answer:
D
Explanation:
The salamanders undergo se×ual reproduction.
What is Se×ual reproduction?
This is defined as the production of new organisms by the combination of genetic information of two individuals of different genders.
Thus results in variations in the offsprings produced which us why the Salamanders had different color patches.
Read more about Se×ual reproduction here https://brainly.com/question/815744
Help! ASAP! Please on the questions
Answer:
62.15 m (squared)
Explanation:
We know that the Area of the square is 5.5 x 4= 22
so 90 degree to 30 degree is divide by 3
so u divide 22 by 3 and get 7.3 wich is the semi circle thing
now 7.3 x 5.5 = 40.15
22 + 40.15 = 62.15 m (squared)
Look im not really sure but I think this is the answer
Please mark as brainliest
Have a great day, be safe and healthy
Thank u
XD
Answer:
1. The area of the rectangle is 22 but I'm not sure the area of the shape above sorry.
A. 28 m
B. 672 m
Explanation:
A. 6 + 6 + 8 + 8 = 28 or 2(6+8) = (2)14 = 28
B. 28 * 24 = 672