Answer:
8.07×10²³ units
Explanation:
6.02×10²³×1.34
8.07×10²³ units
Most large mountains are the result of a(n)?
River
Volcano
Earthquake
Hurricane
Answer:
C.) Earthquake
Explanation:
Most mountains occur due to the movement of tectonic plates. They slowly push into each other, and the earth's crust rises over time forming mountains.
Earthquakes occur due to the shift of tectonic plates. It sends seismic waves throughout the earth's crust, and causes the ground to shake temporarily.
What conversion factor will help solve the problem?
2HgO → 2Hg + O2
How many moles of mercury (II) oxide are needed to make 125 grams of O2
125 g O2 x ___1 mol__O2 x ____________ = mols HgO
32.00 g O2
a
2 mol Hg
1 mol O2
b
216.6 g HgO
1 mol HgO
c
1 mol O2
2 mol HgO
d
2 mol HgO
1 mol O2
Answer:
i fond nothing sooory
pic so PC
How many grams are in 4.5 x 10^22 molecules of water? please show dimensional analysis
Answer:
1.1grams
Explanation:
Find moles of water:
4.5x10^22/(6.02x10^23)=0.07mol
Find molar mass of the water
O=16.00g/mol
0.07x 16.00=1.1 grams
Rank from largest to smallest equilibrium constant. To rank items as equivalent, overlap them KBr2, KCl2, KI2
Answer:
KCl[tex]_{2}[/tex], > KBr[tex]_{2}[/tex], > KI[tex]_{2}[/tex]
Explanation:
KBr[tex]_{2}[/tex], KCl[tex]_{2}[/tex], KI[tex]_{2}[/tex]
The equilibrium constant for the reaction between Alkene and Halogen to give Alkyl halide as a product
Keq = [tex]\frac{[C2H4X2 ]}{[C2H4 ][ X2]}[/tex]
hence the order of equilibrium from the Largest to the smallest equilibrium
= KCl[tex]_{2}[/tex], > KBr[tex]_{2}[/tex], > KI[tex]_{2}[/tex]
ANSWER ASAP Please! How do groups and periods differ? What trend specifically occurs in either?
1. what is an ethical concern about biotechnology
2. list 2 examples of transgenic organism
3. write a 3-sentences summary on how biotechnology affects individual, society, and environment
Answer:
1. There are so many ethical concerns about biotechnology, some Ethical issues that arise from the application of modern biotechnologies include:
Discrimination of individuals because of their health or health history as a result of knowing their genetic information, minimizing harms while maximizing benefits, Interference with nature, privacy.
2. a. Plants (maize, rice)
b. Fish (GloFish)
3. For individuals, biotechnology has helped in the prevention and treatment of a wide range of diseases. For society, biotechnology saves time, improves the health and quality of food through a reduction in the use of pesticides and it can create new viruses and bacteria that cause diseases. Biotechnology could address global change since more genetically modified plants are grown.
Smoking cigarettes is a lifestyle choice that may lead to cardiovascular disease.
Some people who have never smoked cigarettes still have cardiovascular disease.
Give two other factors that may contribute to the occurrence of cardiovascular
disease.
Answer:
High blood pressure. High blood pressure (hypertension) is one of the most important risk factors for CVD.
High cholesterol - High-fat diet.
9
If you wanted to make 250 mL of a 0.01 M solution of CaCl, calculate how many moles of calcium chloride would be
needed. Your response must include both a correct numerical setup and the calculated result. [1]
Answer:
0.0025moles
Explanation:
Molarity of a solution (M) = number of moles (n) ÷ volume (V)
According to this question, to make 250 mL of a 0.01 M solution of CaCl, the following number of moles is needed:
Volume = 250mL = 250/1000 = 0.250Litres.
Using; molarity = n/V
0.01 = n/0.250
n = 0.0025
n = 2.5 × 10^-3 moles.
A 3.4 g sample of an unknown monoprotic organic acid composed of C,H, and O is burned in air to produce 8.58 grams of carbon dioxide and 1.50 grams of water vapor. It was also determined that 279 mL of 0.1 M KOH was needed to titrate the acid completely.
Answer:
[tex]C_7H_6O_2[/tex]
Explanation:
Hello there!
In this case, we can divide the problem in three stages: (1) determine the empirical formula with the combustion analysis, (2) compute the molar mass of acid via the moles of the acid in the neutralization and (3) determine the molecular formula.
(1) In this case, since 8.58 g of carbon dioxide are released, we can first compute the moles of carbon in the compound:
[tex]n_C=8.58gCO_2*\frac{1molCO_2}{44.01gCO_2}*\frac{1molC}{1molCO_2}=0.195molC[/tex]
And the moles of hydrogen due to the produced 1.50 grams of water:
[tex]n_H=1.50gH_2O*\frac{1molH_2O}{18.02gH_2O}*\frac{2molH}{1molH_2O} =0.166molH[/tex]
Next, to compute the mass and moles of oxygen, we need to use the initial 3.4 g of the acid:
[tex]m_O=3.4g-0.195molC*\frac{12.01gC}{1molC}-0.166molH*\frac{1.01gH}{1molH} =0.89gO\\\\n_O=0.89gO*\frac{1molO}{16.0gO}=0.0556molO[/tex]
Thus, the subscripts in the empirical formula are:
[tex]C=\frac{0.195}{0.0556}=3.5 \\\\H=\frac{0.166}{0.0556}=3\\\\O=\frac{0.0556}{0.0556}=1\\\\C_7H_6O_2[/tex]
As they cannot be fractions.
(2) In this case, since the acid is monoprotic, we can compute the moles by multiplying the concentration and volume of KOH:
[tex]n_{KOH}=0.279L*0.1mol/L\\\\n_{KOH}=0.0279mol[/tex]
Which are equal to the moles of the acid:
[tex]n_{acid}=0.0279mol[/tex]
And the molar mass:
[tex]MM_{acid}=\frac{3.4g}{0.0279mol} =121.86g/mol[/tex]
(3) Finally, since the molar mass of the empirical formula is:
7*12.01 + 6*1.01 + 2*16.00 = 122.13 g/mol
Thus, since the ratio of molar masses is 122.86/122.13 = 1, we infer that the empirical formula equals the molecular one:
[tex]C_7H_6O_2[/tex]
Best regards!
If we have 0.072 g of FeCl3 then how many moles are there?
Answer:
~0.0004
Explanation:
[tex]n=\frac{m}{M}[/tex]
n=0.072/(56+(35.5*3))=0.072/162.5~~0.004
5. Write a paragraph about chemical reactions
in everyday life, that cause pollution of the
environment.
Answer:
company smokes
wastes (liquid and solid)
The picture shows a community living in a dry, grassy area. A few organisms have died off due to lack of a water source. ******Is this an example of an abiotic or biotic limiting factor? WHY
Answer:
brainly blurred the half of the question i cant read it completely
Explanation:
If a balloon with a volume of 10L at 500kpa is heated until the balloon has a temperature of 300°C, 750atm and now has a volume of 100mL. What was the original temperature of the balloon (in °C)
Answer:
103.6°C
Explanation:
We solve this problem, with the Ideal Gases Law. We know that moles of gas are not changed through time.
P . V = n . R . T
So n (number of moles) and R (Ideal Gases constant) are the same, they are cancelled. In the two different states, we can propose:
P₁ . V₁ / T₁ = P₂ . V₂ /T₂
We need to make some conversions:
100 mL . 1 L/ 1000mL = 0.1L
500 kpa . 1atm / 101.3 kPa = 4.93 atm
300°C + 273 = 573 K
We replace data:
4.93 atm . 10L / T₂ = 750 atm . 0.1L / 573K
4.93 atm . 10L = (750 atm . 0.1L / 573K) . T₂
(4.93 atm . 10L) / (750 atm . 0.1L / 573K) → T₂
T₂ = 376.65 K
We convert K to °C → 376.65 K - 273 = 103.6 °C
why is conventional solar electricity is so expensive to generate??
Answer:
Most solar cells are made from silicon—the same semiconductor material that is at the heart of computers. The cells are expensive to produce because it takes a great deal of energy to purify the silicon.
Can someone please answer this?
Answer:
B) go look on the periodic table for the atomic number
Explanation:
The atomic number is how many protons is in an atom
Answer:
Either A or B
Explanation: Because I learned it on Edge. :)
I need help answer whenever I have time
Answer:
Lithosphere: Volcanos..
Hydrosphere: Rain falls..
biosphere: Plants..
Explanation:
A gas has a volume of 5.00 L at 20 degrees Celsius. What is the volume of gas at 150 degrees Celsius.
Answer:
7.22 L
Explanation:
From the question,
Applying Charles law,
V₁/T₁ = V₂/T₂...................... Equation 1
Where V₁ = Initial volume of gas, V₂ = Final volume of gas, T₁ = Initial Temperature of gas in Kelvin, T₂ = Final Temperature of gas in Kelvin
Make V₂ the subject of the equation
V₂ = (V₁×T₂)/T₁................. Equation 2
Given: V₁ = 5.00 L, T₁ = 20 °C = (20+273) K = 293 K, T₂ = 150 °C = (150+273) K = 423 K
Substitute these value into equation 2
V₂ = (5.00×423)/293
V₂ = 7.22 L
Read the temp what is it?
17.3 or 17.25??
Answer:
I would say 17.25.
Explanation:
Acid HX has a very large Ka. How will the relative amounts of H+ and HX
compare at equilibrium?
A)The concentration of H+ will be larger than HX
B)The concentration of HX will be larger than H+
C)The concentration of HX will be equal to H+
Which phrase best describes an individual organ?
O A. The simplest unit of life
O B. Made of different kinds of tissues
C. Made of one kind of cell
O D. Meets all the needs of an organism
Answer:
made of different kinds of tissues
Explanation:
cause that's the only one that makes sense because it goes: cell, tissues,organ,organ system , organism
1. the simplest unit of life - cell
2. a individual organ - would be made of different kinds of tissues
3. tissues - would be made of one kind of cell
4- an organ system - meets all the needs of a organism
also it wouldn't make sense for a individual organ to be made of only one kind of cell so yeah
good luck :) I hope this was right
Colour of crushed chalk + Iodine solution
Regions that receive up to 20 inches of rainfall per year are referred to as __________ because they receive more precipitation than most deserts.
semiarid deserts
polar deserts
coastal deserts
subtropical deserts
Answer:
The answer is in fact semi-arid deserts. This just serves as a confirmation cause sometimes the answers be wrong.
Semiarid deserts is the region that receive up to 20 inches of rainfall per year.
What is Rainfall?
This is defined as the amount of precipitation in the form of water droplets that falls onto the surface of Earth from the clouds due to gravity influence.
Semi-arid desert receive more precipitation which is around 20 inches of rainfall than most deserts.
Read more about Semi arid deserts here https://brainly.com/question/3363067
WILL GIVE BRAINLIST
In the Neighborhood
Ahn vigorously scrubbed windows, a tedious necessity for her family's new Vietnamese restaurant. They had turned the building from homely to gorgeous, but everything had to be absolutely perfect: unique decorations, skillful employees, and fabulous traditional food. Then customers would adore the place, making the business a success.
Ahn shifted her vision to look outside the restaurant as a girl about her age, with abundant red hair, strolled up the street. Ahn’s family had recently moved to this neighborhood, so she had few friends.
The girl paused to study the sign announcing their opening and then looked directly at Ahn with a friendly smile. Ahn smiled back shyly and lifted a hand, accidentally waving with the cleaning cloth. The girl laughed at her amusement and waved back in acknowledgment.
Ahn hesitated, not accustomed to initiating friendship, but she felt courageous, so on a whim she opened the door. "Hello," she said, adding the first thing that entered her head, "do you like Vietnamese food?"
"I don't know, but I like to try new things,” the girl remarked, and then she introduced herself as Gabriela.
Ahn could not think of additional conversation until she had a sudden idea. "Please wait here," she requested, "and I'll be right back." She ran into the adjoining kitchen and explained her idea to her father. He was sympathetic, so seconds later Ahn presented a small package to Gabriela. "Some Vietnamese candy for you to try,” she explained. “If you enjoy it, I hope you'll return to the restaurant sometime, or even visit after school when I'll be here preparing for the dinner service."
"Excellent, I'll see you around soon.” Gabriela headed down the street, glancing back with a cheerful wave. Ahn spent the remainder of the afternoon hoping Gabriela really would return and not think Ahn’s gift was weird.
The following day, Ahn assembled bouquets of artificial flowers, orchids that would never wilt. She was admiring her accomplishment when she heard unexpected tapping and turned to see Gabriela beckoning to her with a plate covered with transparent plastic wrap. Ahn grinned with enthusiasm and opened the door with a cordial greeting.
Gabriela presented the plate and said, "I brought biscuits made from my grandmother's recipe to thank you for the delicious candy.”
"Come in, and we can have some biscuits right now," Ahn stammered, happy inside.
Gabriela entered and rotated to scan the room with its picturesque landscape mural. "Thanks, they really are wonderful, and I'm fascinated to see your restaurant."
As they snacked on the treats, Ahn fumbled for conversation and considered an offer. "Are you good with vocabulary?” she inquired. "I intend to design a publicity pamphlet for the restaurant, and I could use some assistance."
"Certainly!" Gabriela said, adding, "I'm delighted you moved into the neighborhood and thrilled I have a new friend."
Ahn grinned, now positive that the restaurant would make a wondrous impression on the community, that customers would be plentiful, and that she was going to enjoy life here immensely
Write a brief summary of the passage you just read “In the Neighborhood”. (Use at least 4 sentences).
This story is about two girls beginning a friendship. What do they do to become friends? What are some examples from the text to support your answer? (Use at least 3 sentences).
Why do you think Ahn was nervous to make friends? (Use at least 2 sentences).
Have you ever done anything to make a friend with someone? How did it turn out? (Use at least 3 sentences).
Have you ever moved to a new place or started something new? Were you nervous? Did anyone help you? (Use at least 3 sentences).
no links please
Answer:
The restraunt was amess when it was first moved into, the girl there was not fimilliar with making friends but she racked up the courage to talk to the little girl who was comming in. They soon started to build on a friendshoip that started a littl rough. But they soon becaume good friends.
Well they are both around the same age and are girls and probably don't have muh experience with that.
She was nervous to make friends because she was not really accustomed to that.
Yes and good.
Explanation:
first time on here, using my frieds old account, sorry for the spelling im in a test. Hope this hellps
Which is a property of a covalent compound?
A.being shaped easily
B.good electrical conductivity
C.low melting point
Answer:
c: low melting point
Explanation:
melting point is dependent on intermolecular forces. in covalent compounds, electrons are shared more equally. this means there is less separation of positive and negative charges within the molecules.
For the reaction So3 + H2O -> H2SO4, how many grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid
Answer:
320 grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid.
Explanation:
The balanced reaction is:
SO₃ + H₂O → H₂SO₄
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
SO₃: 1 moleH₂O: 1 moleH₂SO₄: 1 moleBeing the molar mass of each compound:
SO₃: 80 g/moleH₂O: 18 g/moleH₂SO₄: 98 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
SO₃: 1 mole* 80 g/mole= 80 gramsH₂O: 1 mole* 18 g/mole= 18 gramsH₂SO₄: 1 mole* 98 g/mole= 98 gramsThen you can apply the following rule of three: if 1 mole of sulfuric acid is produced by the reaction of 80 grams of sulfur trioxide, 4 moles of sulfuric acid is produced from how much mass of sulfur trioxide?
[tex]mass of sulfur trioxide= \frac{4 moles of sulfuric acid* 80 grams of sulfur trioxide}{1 mole of sulfuric acid }[/tex]
mass of sulfur trioxide= 320 grams
320 grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid.
The mass of the required compound is 320 grams
Chemical reactionsGiven the chemical equation expressed as:
[tex]SO_3 + H_2O \rightarrow H_2SO_4[/tex]
According to stochiometry, 1 mole of SO3 produces 1 mole of H2SO4, hence the moles of SO3 will also be 4.00moles
Determine the mass of SO3
Mass = mole * molar mass
Mass = 4.0 * [32+3(16)]
Mass = 4.0 * 80
Mass = 320 grams
The mass of the required compound is 320 grams
Learn more on stoichiometry here: https://brainly.com/question/16060223
Can the solubility rules be used to find the state of any compound?
Answer:
yes
Explanation:
solubility rules allow prediction of what products will be insoluble in water.
What causes competition?
Explanation:
Competition stems from the fact that resources are limited. There are simply not enough of some resources for all individuals to have equal access and supply. Competition can occur between organisms of the same species, or between members of different species.
please help
whats the skeleton equation
for this equation
copper sulfate + sodium hydroxide --> copper hydroxide
Answer:
Copper(II) sulphate – sodium hydroxide reaction
The reaction between copper(Il) sulphate and sodium hydroxide solutions is a good place to start. If you slowly add one to the other while stirring, you will get a precipitate of copper(II) hydroxide, Cu(OH)2.
Consider the equation and check all statements that apply to it: HA ↔ H+ + A−
(Select Apply Question)
A. It represents a strong acid buffer system.
B. It represents a weak acid buffer system.
C. Adding a strong acid would shift the equilibrium to the left
D. Adding a strong acid would shift the equilibrium to the right
Answer:
The answer is B & C
Explanation:
7. Given the balanced equation:
As a sample of I2(s) sublimes to I2(g), the entropy of the sample