PLEASE HELP QUICK AS POSSIBLE!!!!
How much heat is required for 25.0g of water to rise in temperature from 35.0 to 75.0°C?
Formulas~
*q = mcT (temp change)
*q = mH (phase change)
Answer:
4180J
Explanation:
(25.0g)(4.184J/g°C)(75°C-35.0°C)
(25.0g)(40.0°C)(4.184J/g°C)
(1.00*10³g°C)(4.184J/g°C) = 4184J
use sig figs:
4180J
1. What is an air mass? 2. What 2 factors characterize an air mass? 3. What determines the two characteristics of an air mass? 4. What would a cold and wet air mass be called? 5. What would a warm and dry air mass be called? 6. What type of air mass do you think would form over Canada? 7. What kind of weather is associated with a cold front? 8. What kind of weather is associated with a warm front? 9. What symbol on a map represents a warm front? 10. What symbol on a map represents a cold front? 11. What type of weather is associated with a stationary front? 12. How does an occluded front form? 13. What kind of weather can an occluded front bring? 14. What is the symbol on a map to show an occluded front?
Answer:
1. a body of air with horizontally uniform temperature, humidity, and pressure.
2. Boundaries between unlike air masses. Air masses have fairly uniform temperature and moisture content in horizontal direction (but not uniform in vertical). Air masses are characterized by their temperature and humidity properties.
3. Air masses have fairly uniform temperature and moisture content in horizontal direction (but not uniform in vertical). Air masses are characterized by their temperature and humidity properties.
4. Continental air masses are characterized by dry air near the surface while maritime air masses are moist. Polar air masses are characterized by cold air near the surface while tropical air masses are warm or hot.
5. Continental air masses form over land and are dry. Therefore, an air mass that develops over northern Canada is called a continental polar air mass and is cold and dry. One that forms over the Indian Ocean is called a maritime tropical air mass and is warm and humid.
6. an air mass that develops over northern Canada is called a continental polar air mass and is cold and dry.
7. Commonly, when the cold front is passing, winds become gusty; there is a sudden drop in temperature, and heavy rain, sometimes with hail, thunder, and lightning.
8. stormy
9. The symbol that is used to identify a cold front on a weather map is a blue line with triangles that point in the direction in which the cold front is moving. The line is represents the leading edge of the cooler air mass.
10. The symbol that is used to identify a cold front on a weather map is a blue line with triangles that point in the direction in which the cold front is moving. The line is represents the leading edge of the cooler air mass
11. Because a stationary front marks the boundary between two air masses, there are often differences in air temperature and wind on opposite sides of it. The weather is often cloudy along a stationary front, and rain or snow often falls, especially if the front is in an area of low atmospheric pressure.
12. At an occluded front, the cold air mass from the cold front meets the cool air that was ahead of the warm front. The warm air rises as these air masses come together. Occluded fronts usually form around areas of low atmospheric pressure.
13. The temperature drops as the warm air mass is occluded, or “cut off,” from the ground and pushed upward. Such fronts can bring strong winds and heavy precipitation. Occluded fronts usually form around mature low pressure areas.
14.An occluded front is a combination of those two signs. They are indicated on a weather map either by a purple line with alternating semicircles and triangles pointing in direction of travel, or by red semicircles and blue triangles pointing in the same direction.
Explanation:
:)
Answer:
Heya
Explanation:
1) air mass:- An air mass is a large volume of air in the atmosphere that is mostly uniform in temperature and moisture.
2) Air masses are characterized by their temperature and humidity properties.
3) ( same answer i.e. temperature and humidity properties).
4) Colder air masses are termed polar or arctic, while warmer air masses are deemed tropical. Continental and superior air masses are dry while maritime and monsoon air masses are moist. Weather fronts separate air masses with different density (temperature or moisture) characteristics.
5) Continental air masses are characterized by dry air near the surface while maritime air masses are moist. Polar air masses are characterized by cold air near the surface while tropical air masses are warm or hot. Arctic air masses are extremely cold.
6) Maritime air masses form over water and are humid. Continental air masses form over land and are dry. Therefore, an air mass that develops over northern Canada is called a continental polar air mass and is cold and dry.
7) Commonly, when the cold front is passing, winds become gusty; there is a sudden drop in temperature, and heavy rain, sometimes with hail, thunder, and lightning. Lifted warm air ahead of the front produces cumulus or cumulonimbus clouds and thunderstorms.
8) Warm fronts often bring stormy weather as the warm air mass at the surface rises above the cool air mass, making clouds and storms. Warm fronts move more slowly than cold fronts because it is more difficult for the warm air to push the cold, dense air across the Earth's surface.
9) The symbol that is used to identify a warm front on a weather map is a red line with half circles that point in the direction in which the warm front is moving. The line represents the leading edge of the warmer air mass.
10) On weather maps, the surface position of the cold front is marked with the symbol of a blue line of triangles/spikes (pips) pointing in the direction of travel.
11) Because a stationary front marks the boundary between two air masses, there are often differences in air temperature and wind on opposite sides of it. The weather is often cloudy along a stationary front, and rain or snow often falls, especially if the front is in an area of low atmospheric pressure.
12)At an occluded front, the cold air mass from the cold front meets the cool air that was ahead of the warm front. The warm air rises as these air masses come together. Occluded fronts usually form around areas of low atmospheric pressure.
13) The warm air mass rises as the cool air masses push and meet in the middle. The temperature drops as the warm air mass is occluded, or “cut off,” from the ground and pushed upward. Such fronts can bring strong winds and heavy precipitation. Occluded fronts usually form around mature low pressure areas.
14)Occluded fronts are drawn as a solid purple line with half circles and triangles pointing in the direction that the front is moving. An occluded front usually brings dry air.
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Sorry for spamming but this is due tomorrow! Can someone help me please!!
Answer:
1. in the Northern Hemisphere the vernal equinox falls about March 20 or 21, as the Sun crosses the celestial equator going north. In the Southern Hemisphere the equinox occurs on September 22 or 23, when the Sun moves south across the celestial equator.
Explanation:
Hope this helps ^^
Scientists are trying to control the Maillard reaction by?
Answer:
Intervention of Maillard reactions by the addition of natural and synthetic chemical compounds has previously been directed toward removing one of the reactants (the amino groups or the reducing sugars) or adding sulfur-containing compounds, such as sulfur dioxide or N-acetyl cysteine, which inhibit the reactions
Explanation:
Question 8 of 35
Which item rotates in a magnetic field as an electric motor produces kinetic
energy?
A. Permanent magnet
B. Loop of wire
C. Lightbulb
D. Battery
SUBMIT
You can download answer here
tinyurl.com/wpazsebu
H2SO4 + 2 KOH --> K2SO4 + 2 H2O
Combustion
Synthesis
Decomposition
Single replacement
Double replacement
O Neutralization
Transcribe the following piece of DNA ........AAG-CCA-TGA-ACA
Answer:
TTC-GGT-ACT-TGT I could be wrong because A could eather be considered a U or a T, but u could also use UUC-GGU-ACU-UGU
What is the molality of a solution containing 18.2 g HCl and 250. g of water?
(EZ Points here)
Answer:
1.99M
Explanation:
Molality can be calculated by dividing the moles of solute by the mass of the solvent i.e.
Molality (M) = n of solute (mol) ÷ mass of solvent (kg)
Based on the information, mass of HCl (solute) = 18.2g, mass of solvent (water) = 250.0g
mole of solute = mass/molar mass
Molar mass of HCl = 1 + 35.5 = 36.5g/lol
mole = 18.2/36.5
mole = 0.499mol
Mass of solvent = 250.0g
In Kg, mass of water = 250/1000
= 0.250Kg
Molality = 0.499/0.250
Molality = 1.996
Molality of the solution = 1.99M
In the reaction 2 FeBr3 + 3 Cl2 → 2 FeCl3 + 3 Br2, how many grams of bromine gas are produced from 2.50 moles of FeBr3?
Answer:
but iron is 2 and 3 by its valance how could it be possible
Which of the following are parts of the Nervous System?
Choose all the apply
Nerves
Brain
Heart
Skin
Spinal Cord
Lungs
Answer: Nerves, Brain and spinal cord
Explanation:the other choices are either part of the cardiovascular system or the respiratory system
what is wind in more than 15 words?
Answer:
Wind is Air in a natural motion, as that moving horizontally at any velocity along the earth's surface.
After reading that a solution is a homogeneous mixture, Hala wondered about her favorite
morning drink, grape juice. Which statement about the solution that makes up grape juice is
true? *
1Sugar is one of the solvents, and grapes are one of the solutes.
2Grapes are the solvent and water is one of the solutes.
3Water is the solvent, and sugar is one of the solutes.
4Sugar is the solvent, and water is one of the solutes.
does lithium violate the octect rule
Answer: Lithium, an alkali metal with three electrons, is also an exception to the octet rule. Lithium tends to lose one electron to take on the electron configuration of the nearest noble gas, helium, leaving it with two valence electrons. There are two ways in which atoms can satisfy the octet rules.
Explanation: Hope this helped! :)
In a reaction 25.00mL of nitric acid required 51.4mL of 0.73M calcium hydroxide. Calculate the grams of nitric acid per liter of solution
Answer:
47.27 g HNO₃
Explanation:
The reaction between nitric acid (HNO₃) and calcium hydroxide (Ca(OH)₂) is the following:
2HNO₃(aq) + Ca(OH)₂(aq) → Ca(NO₃)₂ + 2H₂O(l)
According to the chemical equation, 2 moles of HNO₃ reacts with 1 mol of Ca(OH)₂. At the point of total neutralization, the total number of moles of HNO₃ reacts with the total number of moles of Ca(OH)₂:
2 x moles HNO₃ = moles Ca(OH)₂
The number of moles is equal to the product of molarity of the solution (M) and the volume in liters (V):
M(HNO₃) = ?
M(Ca(OH)₂) = 0.73 M
V(HNO₃) = 25.00 mL x 1 L/1000 mL = 0.025 L
V(Ca(OH)₂) = 51.4 mL x 1 L/1000 mL = 0.0514 L
So, we can write the equation at neutralization point as:
2 x (M(HNO₃) x V(HNO₃)) = M(Ca(OH)₂) x V(Ca(OH)₂)
From this, we can calculate the molarity of HNO₃:
M(HNO₃) = (M(Ca(OH)₂) x V(Ca(OH)₂))/2 x V(HNO₃)
= (0.73 M x 0.0514 L)/(2 x 0.025 L)
= 0.75 M HNO₃
We can convert the molarity from M (mol/L) to g/L by using the molecular weight of HNO₃:
Mw(HNO₃) = 1 g/mol H + 14 g/mol N + (3 x 16 g/mol O) = 63 g/mol
Finally, we multiply the molarity by the molecular weight to obtain the grams of nitric acid per liter of solution:
0.75 mol/L HNO₃ x 63 g/mol = 47.27 g HNO₃
Help!!! Would give brainliest
Answer: Acids have a pH of less than 7 and generally form [tex]H^+[/tex] when dissolved in solution. [tex]H_2SO_4[/tex] is an example of acid.
Bases have a pH of more than 7 and generally form [tex]OH^-[/tex] when dissolved in solution. [tex]Ca(OH)_2[/tex] is an example of base.
Water is neutral and has a pH of exactly 7. Therefore in chemical equations it can act as acid or a base.
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution. pH is calculated by taking negative logarithm of hydrogen ion concentration.
[tex]pH=-\log [H^+][/tex]
pH values range from 1 to 14. Acids have a pH range from 1 to 6.9, water is neutral with pH of 7 and bases have pH ranging from 7.1 to 14.
Acids form hydrogen ions when dissolved in water and bases form hydroxide ions when dissolved in water. Water [tex]H_2O)[/tex] is amphoteric and thus can behave as an acid or a base.
[tex]H_2SO_4\rightarrow 2H^++SO_4^{2-}[/tex]
[tex]Ca(OH)_2\rightarrow Ca^{2+}+2OH^[/tex]
Which of the following pairs of elements will combine to produce a covalent bond?
1-Hydrogen and chlorine
2-Magnesium and oxygen
3-Lithium and bromine
Answer:
Hydrogen and Chlorine
ie HCL
The pairs of chemical elements that will combine to produce a covalent bond is: 1. Hydrogen and chlorine.
In Chemistry, the three (3) main types of chemical bonds include:
Ionic bonds: Lithium and bromineHydrogen bonds: Hydrogen and oxygen.Covalent bonds: Hydrogen and chlorine.A covalent bond can be defined as a type of bond that typically involves the sharing of electrons between the atoms of a chemical element.
For example, the type of bond that is produced (formed) between hydrogen atoms and a chlorine atom is a covalent bond.
The hydrogen atom shares it single electron with a chlorine atom that is having seven (7) valence electrons to produce an inert gas such as hydrochloric acid (HCL).
In conclusion, the pairs of chemical elements that will combine to produce a covalent bond is hydrogen and chlorine.
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For the balanced equation shown below, how many moles of N2 reacted, if 155 moles of NH3 are produced?
3H2 + N2 => 2NH3
Answer: 1 mole nitrogen produces 2 moles ammonia
How many moles you need for 155 mol ammonia?
155/2 moles
Explanation:
which of the following is not found in cytoplasm
A.water
B.carbohydrates
C.salt
D.vitamins
Answer:
Carbohydrates
Explanation:
this is because cytoplasm is a substance that fills living cells.
which of the following is not found in cytoplasm
A.water
B.carbohydrates
C.salt
D.vitamins
Answer:
B is the right answer
carbohydrates are not found inside the cytoplasm so therefore it is B
Answer:
D
Explanation:
The cytoplasm is composed of water, salt and some organic molecules. (e.g. carbohydrates)
Magnesium hydroxide is added to a solution of hydrochloric acid. A reaction occurs and magnesium chloride and water are formed. Testing the _______ would show that a reaction has occurred.
Answer:Magnesium (Mg) is a - reactant
Hydrogen (H2) is a - product
magnesium chloride (MgCI2) is a - product
hydrochloric acid (HCI) is a - reactant
Explanation: It’s in my notes
Describe the region(s) of the Atlantic Oceans where dense waters will likely sink/
Answer:
The densest ocean water is formed in two primary locations near the poles, where the water is very cold and highly saline as a result of ice formation. The densest deep water mass is formed in the Weddell Sea of Antarctica, and becomes the Antarctic Bottom Water (AABW).
Explanation:
The densest ocean water is formed in two primary locations near the poles, where the water is very cold and highly saline as a result of ice formation. The densest deep water mass is formed in the Weddell Sea of Antarctica, and becomes the Antarctic Bottom Water (AABW).
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, north Atlantic Ocean is the region of Atlantic Oceans where dense waters will likely sink.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density = Mass of the metal ball ÷volume marked on the graduated cylinder
North Atlantic Ocean is the region of Atlantic Oceans where dense waters will likely sink. Here, water is very cold and salty which makes the water denser.
Therefore, north Atlantic Ocean is the region of Atlantic Oceans where dense waters will likely sink.
To know more about density, here:
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??? Ipc helppp pllzz
HELP !!! urgent
which one is oxidized ?
lead (II) oxide + carbon monoxide= lead + carbon dioxide
Answer:
carbon monoxide (CO)
Explanation:
carbon monoxide (CO) is oxidized because it gains oxygen to turn to carbon dioxide (CO2)
what is a molecule??
Answer:
molecule is a group of atoms bonded together representing the smallest fundamental unit of a chemical reaction
The pressure in a tire is 101 kPa at 10.0°C, what will be the pressure of a tire at 45.0°C?
Answer:
P₂ = 113.49 kPa
Explanation:
Given that,
Initial pressure, P₁ = 101 kPa
Initial temperature, T₁ = 10.0°C = 283 K
Final temperature, T₂ = 45°C = 318 K
The relation between pressure and temperature is given by :
[tex]\dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
Where
P₂ is the new pressure
So,
[tex]P_2=\dfrac{P_1T_2}{T_1}\\\\P_2=\dfrac{101 \times 318}{283 }\\\\P_2=113.49\ kPa[/tex]
So, the new pressure is equal to 113.49 kPa.
choose the correct one
Answer:
B. More reactant is added.
Explanation:
The question basically asks at which condition would the forward reaction be favoured.
The law of equilibrium states when a system at equilibrium is disturbed by, it would annul that change. In order to increase the forward reaction, more of the reactant should be added. In order to annul this change, the system would have to favour the reaction that deals with reducing the amount of reactant added.
The correct option is;
B. More reactant is added.
True or false force cannot be measured
Answer:
False
Explanation:
Answer:
true
Explanation:
i dont know if you want more info on how it is true just tell me if you do and i will add it in
Given two balanced equations, each representing a reaction:
(1) Equation 1 shows 2.2 X 105 times more energy being absorbed. (\
2) Equation 2 shows 2.2 X 105 times more energy being absorbed.
(3) Equation 2 shows 2.2 X 105 times more energy being released.
(4) Equation 1 shows 2.2 X 105 times more energy being released.
Answer:
There is a hack in forms that forms gives u the answer hold ctrl + u, and scrool to the bottom he read the part with the question and there will be an answer.
Mark as brainliest if im right good luck
Plz answer question! Due Today!!! Question is in picture! Will make BRAINLIEST for first correct answer!!! No links plz!
Answer:
I'd Go. B. weigh everything, let the reaction happen, then weigh everything again.
2KClO₃ → 2KCl + 3O₂ If 25.0 g of KClO₃ decompose, what mass of O₂ will form? *
Answer: approximately 15.1 grams.
Explanation: The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want. Change 25 grams of potassium chlorate to moles. Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron. 1 K x 39 grams/mole+1 Cl x 35.4grams/ mole+3 O x 16 grams/ mole = 122.4 grams / mole Potassium Chlorate 25 122.4 = moles. 2.05 moles of Potassium Chlorate. There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride. 2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride. Find the gram molecular mass of Potassium Chloride. 1 K x 39 = 39+1 Cl x 35.4 = 35.4 = 74.4 grams / mole. 2.05 moles x 74.4 grams/ mole = 15.2 grams
The mass of O₂ that will be form is 9.8 grams
The chemical reaction is as follows:
2KClO₃ → 2KCl + 3O₂
From the reaction 2 moles of potassium trichlorate decompose to form 2 moles of potassium chloride and 3 moles of oxygen.
Therefore,
molar mass of KClO₃ = 39 + 35.5 + 48 = 122.5 grams
molar mass of O₂ = 32 grams
Therefore,
2(122.5) g of KClO₃ produces 3(32) grams of O₂
25 g of KClO₃ will produce ? grams of O₂
cross multiply
mass of O₂ produced = 96 × 25 / 245
mass of O₂ produced = 2400 / 245
mass of O₂ produced = 9.7959
mass of O₂ produced ≈ 9.8 grams
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