Answer:
8.3
Explanation:
What property of air makes it possible to surf on the air?
Answer:
yeah if enough pressure or force is added
12. Why does a water molecule have a bent shape?
A. The protons in the nucleus of the hydrogen atoms repel the protons in the nucleus of the oxygen
atom.
B. The oxygen atom has lone pairs of
electrons.
C. The hydrogen atoms repel each other.
D. It has two covalent bonds.
Answer:
A water molecule consists of two hydrogen atoms bonded to an oxygen atom, and its overall structure is bent. This is because the oxygen atom, in addition to forming bonds with the hydrogen atoms, also carries two pairs of unshared electrons. All of the electron pairs—shared and unshared—repel each other.
Explanation:
I need help finding real life images of both prophase and interphase. I end up mixing them together
Answer:
the first picture is of prophase and the second one is interphase
Explanation:
please Mark as BRAINLIEST
You have two cubes. They are the same size. They are both painted
white. One is iron, the other copper. What is the best way to determine
which is which?
You can determine which is which by weighting them
Copper usually weighs heavier than iron, so if you weigh them both on the scale, the heavier one would be the copper cube
Hope this helped!
3. If a sample of gas occupies 6.80 L at 325oC, what will its volume be at 25oC if the pressure doesn't change
Answer:
V2 = 3.39
Explanation:
V1/T1 = V2/T2
V1 = 6.80L
T1 = 325C (must be convert to K by + 273.15) = 598.15 K
T2 = 25C = 298.15 K
V2 =?
T2xV1/T1 = V2
298.15 x 6.80/ 598.15 = V2
3.39 = V2
So 3.39 is the answer!
16. Write a two-column proof. (4 points)
Given: Ty = 8x – 14: y = 6
Prove: x=7
Answer:
To me a two column proof is usually associated with Euclidean Geometry.
To use it here in this rather simplistic problem is like using a sledge hammer to drive in a finishing nail ...
here is what I would do
7y=8x-14; y=6
then:
42 = 8x - 14
56 = 8x
x = 56/8 = 7
There! I have proven it.
Explanation:
Why my arms feel cool when alcohol evaporates from my skin?
Answer:
Alcohol evaporates much faster than water due to its lower boiling temperature. This allows more heat to be transferred faster, which makes it feel colder to the touch.
Explanation:
Find the number of molecules and number of each type of atom of 0. 04 moles of H2C2O4
answer
Explanation: i think 0.49
PLEASE HELP ASAP!! WILL MARK BRAINLIEST FOR CORRECT ANSWER!!
The volume of a gas is 3. 0 L, the pressure is 1. 0 atm, and the temperature is 300 K. A chemist changes one factor while keeping another constant so that the new volume is 2. 0 L. What are the new conditions?
A. The final pressure is 0. 5 atm, while temperature is kept constant.
B. The final temperature is 200 K, while pressure remains constant.
C. The final pressure is 0. 2 atm, while temperature is kept constant.
D. The final temperature is 350 K, while pressure remains constant
Answer:
letter D is the answer
Explanation:
D. The final temperature is 350 K, while pressure remains constant
Answer:350 K, while pressure remains constant
Explanation:
Using the formula M1V1 = M2V2 , how many milliliters of a 2.50 M hydrochloric acid solution is required to make 100.0 mL of a 0.750 M solution?
30mL
1.88
300mL
333mL
Answer:
30mL is required
30ml of a 2.50 M hydrochloric acid solution is required to make 100.0 mL of a 0.750 M solution.
What is HCl?HCl is an acid which is made up of hydrogen and chlorine gas.
By the formula of dilution
M1V1 = M2V2
where V1 = 2.50 m
M2 = 100.0
V2 = 0.750 m
M1 × 2.50 m = 100.0 × 0.750 m
M1 = 30 ml
Thus, the M1 is 30 ml option a is correct.
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Two white powders are mixed in a flask the bottom of the flask feels cooler this is an example of what kind of reaction?
1.) Given the % composition of each element in the following compound. Calculate and determine the empirical formula. Name the formula as well.
1.6% H 22.2% N 76.2% O.
Hint, assume a 100 g sample, then you will have 1.6 g H, 22.2 g N and 76.2 g O
2. A sample of a compound is broken down into its constituent elements and yields 13.0 g of lead, 1.77 g of nitrogen and 4.03 g of oxygen. What is the empirical formula for this compound?
3.) If 4.04g of N combine with 11.46g O to produce a compound with a molar mass of 108.0 g/mol, what is the molecular formula of this compound?
1. The empirical formula of the compound is HNO₃. The name of the compound is trioxonitrate (v)
2. The empirical formula of the compound is PbN₂O₄ or Pb(NO₂)₂
3. The molecular formula of the compound is N₂O₅
1. How to determine the empirical formula Hydrogen (H) = 1.6 gNitrogen (N) = 22.2 gOxygen (O) = 76.2 gEmpirical formula =?Divide by their molar mass
H = 1.6 / 1 = 1.6
N = 22.2 / 14 = 1.586
O = 76.2 / 16 = 4.7625
Divide by the smallest
H = 1.6 / 1.586 = 1
N = 1.586 / 1.586 = 1
O = 4.7625 / 1.586 = 3
Thus, the empirical formula of the compound is HNO₃ and the name of the compound is trioxonitrate (v)
2. How to determine the empirical formula Lead (Pb) = 13 gNitrogen (N) = 1.77 gOxygen (O) = 4.03 gEmpirical formula =?Divide by their molar mass
Pb =13 / 207 = 0.0628
N = 1.77 / 14 = 0.1264
O = 4.03 / 16 = 0.2519
Divide by the smallest
Pb = 0.0628 / 0.0628 = 1
N = 0.1264 / 0.0628 = 2
O = 0.2519 / 0.0628 = 4
Thus, the empirical formula of the compound is PbN₂O₄ or Pb(NO₂)₂
3. How to determine the molecular formulaWe'll begin by determining the empirical formula of the compound. This can be obtained as follow:
Nitrogen (N) = 4.04 gOxygen (O) = 11.46 gEmpirical formula =?Divide by their molar mass
N = 4.04 / 14 = 0.2886
O = 11.46 / 16 = 0.71625
Divide by the smallest
N = 0.2886 / 0.2886 = 1
O = 0.71625 / 0.2886 = 2.5
Multiply by 2 to express in whole number
N = 1 × 2 = 2
O = 2.5 × 2 = 5
Thus, the empirical formula of the compound is N₂O₅
Finally, we shall determine the molecular formula of the compound. This can be obtained as follow:
Empirical formula = N₂O₅Molar mass of compound = 108 g/mol Molecular formula =?Molecular formula = empirical × n = molar mass
[N₂O₅]n = 108
[(2×14) + (16×5]n = 108
[28 + 80]n = 108
108n = 108
Divide both side by 108
n = 108 / 108
n = 1
Molecular formula = [N₂O₅]n
Molecular formula = [N₂O₅] × 1
Molecular formula = N₂O₅
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Which constellation is connected with lines in the
picture?
Little Dipper
Big Dipper
Orion
Polaris
Please help me with this question
Answer:
Big dipper
Explanation:
Big dipper is one of most famous star branchIt consists of 7 bright stars The last two in a straight axis leds to another bright star.They make a spoon like shapeName the different groups of metals. Name an element with each group.
Answer:
alkali metals, alkaline earth metals, transition metals, basic metals, lanthanides (rare earth elements), and actinides.
Explanation:
The type of intermolecular force present in I2, Br2, and Cl2 is:
a. london dispersion
b. dipole dipole
c. hydrogen bond
d. metallic
explain why
Answer:
d metallic is the sum of the following is not a primary function of the following method
Arctic foxes have adapted to the tundra cycles by turning white in the wintertime. Which other tundra animal has adapted the same way?
black flies
wild musk ox
willow ptarmigan
grey wolf
Similar to Arctic foxes, the Grey wolves fur turn white in winter as a form of adaptation to enable to avoid detection by prey.
What is adaptation?Adaptation refers to the special features or structures possessed by organisms which enhances their chances of survival in their environment.
Arctic foxes turn white in winter in order to avoid detection by predators as well as to be able to easily catch prey.
A similar adaptation has been observed in grey wolves whose fur turn white in winter to enable to avoid detection by prey.
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Answer:willow ptarmigan
Explanation:They change their feathers to white in the winter from red in the summer
The two reactions illustrated in the diagrams below often occur when a foreign substance enters the body.
Foreign substance
Specific proteins
©
Y
produces
Cell A
Cell B
4. The specific proteins produced by cell B, would most likely be:
1. Antigens
2. Antibodies
2. Allergens
3. Amino Acids
The specific proteins produced by cell B in response to the foreign substance are antibodies.
What are antibodies?Antibodies are specific proteins produced by the immune cells of the body in response to a foreign substance called antigen which produces the immune response.
Antibodies are released by immune cells such as B cells.
The antibodies bind to antigen and tag them for destruction by phagocytes.
Therefore, cell B will produce antibodies.
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PLS HELP GUYS WILL GIVE BRAINLIEST !!!!! How many moles are in 40.2 g Cu?
mol Cu
How many moles are in 14.1 g S?
mol S
Answer:0.633 0.440
Explanation:
edge
There are 0.6326 mole in Cu atom and 0.4397 mole in S atom.
What is mole?A mole would be defined as the quantity of a material that includes precisely 6.02214076 X [tex]10^{23}[/tex] of the substance's elementary entities.
Calculation of mole of Cu
Given data:
Mass of Cu = 40.2 g
Molar mass of Cu = 63.546 u
Mole?
Mole can be determined by the formula:
Mole = mass / molar mass
Mole = 40.2 g / 63.546 u
Mole = 0.6326
Calculation of mole of S.
Given data:
Mass of S = 14.1 g
Molar mass of S = 32.065u
Mole = ?
Mole can be determined by the formula:
Mole = mass / molar mass
Mole = 14.1 g / 32.065u
Mole = 0.4397
Therefore, there are 0.6326 mole in Cu atom and 0.4397 mole in S atom.
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Consider the reaction below. 2c6h14 19o2 right arrow. 12co2 14h2o how many moles of hexane (c6h14) must burn to form 18.4 mol of carbon dioxide? 1.53 mol 3.07 mol 110. mol 175. mol
3.07 moles of hexane must burn to form 18.4 moles of carbon dioxide.
What is moles?Moles of any substance is define as the ratio of the given mass to the molar mass of that substance.
Given chemical reaction is:
2C₆H₁₄ + 19O₂ → 12CO₂ + 14H₂O
From the stoichiometry of the reaction, it is clear that:
2 moles of C₆H₁₄ = produce 12 moles of CO₂
1 moles of CO₂ produced by = 2/12 moles of C₆H₁₄
18.4 moles of CO₂ produced by = 1/6×18.4=3.07 moles of C₆H₁₄
Hence, option (2) is correct i.e. 3.07 moles.
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which of these does an open office or microsoft office wizard do?
Answer:
C. guides you through the steps to complete a complex task.
Explanation:
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Please help me with 17 & 18!!
Thankss in advance!! :)
#17
#a
Group 15 elements have valency 3
B,Al are the answers#b
Oxygen is more reactiveLet's check the EC of both
[tex]\\ \rm\Rrightarrow [O]=1s^22s^22p^4[/tex]
[tex]\\ \rm\Rrightarrow [S]=[Ne]3s^23p^4[/tex]
Oxygen is smaller in size Hence more electronegative.#c
Decrease in size
Farther we go in a period more electrons are added to the atom .So nuclear charge increases and atomic radius decreases#18
#a
HNO_3#b
Nitric acid is a acid so methyl orange turns red#c
Used as oxidising agent1 Which climate zone has hot summers, cold winters, and average amounts of precipitation throughout the year? (2 points)
a
Equator
b
Polar
c
Temperate
d
Tropical
Answer:
C
Explanation:
i took the test
The temperate climatic zone has hot summers, cold winters, and average amounts of precipitation throughout the year. Thus, option C is correct.
What is a Climatic zone?The climatic zone may be defined as a world area or part discerned from a neighbor by a significant physical climatic attribute that is of a transnational scale.
The movement of the sun from the tropic of cancer to the tropic of Capricorn determines the climate of a particular zone. The equator zone is more consistent with climatic attributes. The tropical zone has seasonal climatic attributes.
Therefore, the correct option is C.
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Why is it important to balance the redox equation for the electrolysis of water?.
Electrolysis is a process, which allows us to break down a chemical compound into its elements, completing the balance by adjusting the number of atoms on both sides of the reaction is important because the number of electrons given up during oxidation must be the same as the number of electrons gained during the reduction.
What is electrolysis of water?It is a process of oxidation and reduction of one or more elements that, through the induction of electric current, breaks down the water molecule (H2O), thus producing gaseous hydrogen and oxygen.
Oxidation and reduction processes occur simultaneously and never in isolation, which is why they are called redox reactions.
Therefore, we can conclude that electrolysis is a process where electrical energy will change to chemical energy where it is important that the number of electrons given up during oxidation is the same as the number of electrons gained during reduction.
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a maximum a person on earth can lift is about 270kg. On mars a person could lift is about 440kg. Explain why?
The discrepancy in how much a person can lift on Earth and in Mars is due to the difference in the acceleration due to gravity in both planets.
Dependence of Weight on the Acceleration due to GravityAlthough, the physical Quantity, mass is always constant as it is a measure of the quantity of matter in a body. The weight on the other hand is a function of the acceleration due to gravity and hence is different in different planets.
On this note, it follows that a person can carry 270kg mass on earth and 440kg mass on Mars.
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HNO3(aq)+H,0(1)+2NO(g) what is the total number of nitrogen atoms?
Answer:
3n+2n=5n 5 nitrogen atoms
A helium filled balloon has a pressure of 101 kPa and a temperature of 23 C. It is placed in a freezer where the temperature is 0 C. If the volume of the balloon remains constant, what is the new pressure of gas in the balloon?
Answer:
P2 = 0.91 atm
Explanation:
Using Gay-Lussac's Law for this question: P1/T1 = P2/T2
P1 = 101 kPa (dividing by 101.3 to convert to atm) = 0.99 atm
T1 = 23C (must be convert to Kelvin by plus 273.15) = 296.15K
T2 = 0C = 273.15K
P2 = ?
P1/T1 = P2/T2
(Multiply both sides by T2 to get rid of it).
273.15 x 0.99/296.15 = P2
P2 = 0.91 atm
Need help asp will give brainliest
Answer:
Explanation:
1: the sciencetific name of a giant squid is called Architeuthis
2: i dont know I think it says diet but: Giant squid mostly eat deep water fishes and other squids.
3: the range of a Giant squid can be found in oceans around the world at depths of at least 2,950 feet, but their exact range is unknown.
4, characteristics,
1: it has two large fins attached to its mantle.
2: the giant squid have many unique features, such as their ability to produce 'ink' to distract and deter predators.
3:
facts,
1: Their eyes are the largest eyes in the animal kingdom and are about 10 inches
2: Their big eyes help them to spy objects in dark depths where most other animals would see nothing
3: Until 2005, nobody had ever seen a giant squid that was alive.
4: According to the stories, an huge squid would wrap its arms around a whale, causing a terrible fight to start.
5: Giant squid have small fins at the rear of their mantles used for locomotion.
Human IMPACT
Not only can squids and octopuses sense sound, but as it turns out, these and other so-called cephalopods might be harmed by growing noise pollution in our oceans—from sources such as offshore drilling, ship motors, sonar use and pile driving.
What is the enthalpy of reaction for the decomposition of NO2(g)? 2NO2(g) Right arrow. N2(g) 2O2(g) kJ This reaction is.
Answer:
The reaction is: -67.68
Explanation:
hope this helped:)
HNO3 ions in an aqueous solution. A forms or B. does not form
Answer:
A. forms, I used his answer and it was wrong so forms is the answer...
Which of the following is a chemical properties
A Hardness
2. Metting point
C. Flatility
D. Martin