The chemical reaction occurs due to which heat energy is released. This type of reaction is also called exothermic reaction.
What is exothermic reaction?Exothermic reactions are those chemical reactions that produce heat or thermal energy to the surrounding environment so we can conclude that chemical reaction occurs when the temperature of the beaker is suddenly increased.
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Identify important characteristics, chemical properties, physical properties, pH ranges, and examples of acids and bases.
Answer/Explanation:
Acids:
Physical ⇒ Sour Taste, Increases the concentration of hydrogen ions when added to water
Chemical ⇒ Corrosive (Burns your skin and breaks down other materials), Forms hydrogen gas when it comes in contact with a metal, Forms salt and water when added to a base
Example: Tomatoes
Bases:
Physical ⇒ Bitter taste ( Never taste or smell a substance unless your parent/guardian tells you that it is okay), Slippery feeling(never touch a substance unless your parent/guardian tell you that is okay)
Chemical ⇒ Increases the concentration of hydroxide ions when added to water, Forms salt and water when added to an acid
Example: Soap, Clorox
[RevyBreeze]
What two methods brings conductivity to semiconductors?
6. Identify a factor that is NOT responsible for the formation of sedimentary rocks.
A
glacier
B
magma
o
С
river
D
wind
Answer:
Magma is not a factor responsible for the formation of sedimentary rock.
Explanation:
1: What type of acid-base reactions are solely defined by how protons are given up or are taken? (0.5pt)
2: What is a Hydroxide ion? (0.5pt)
3: What two products do all acid-base neutralization reactions produce (0.5pt)?
4: Calculate the pH of a 0.25M solution of H3O+ (0.5pt)
5: Calculate the pH of a 6.3x10-8M solution of H3O+ (0.5pt)
6: Look at your answer for 4 and 5 which one is a base? (0.25pt)
7: Look at 4 and 5 which one is a strong acid (be careful with this one I will know that you didn't watch the recording if you get it wrong) (0.25pt)
An acid-base reaction involves the exchange of one or more hydrogen ions H+ which leads to the production of water and salt.
What is a acid–base reaction?An acid–base reaction is a type of chemical reaction that involves the exchange of one or more hydrogen ions H+ means proton, between reactive species. For example, the hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) produces a solution of sodium chloride (NaCl) and water molecules.
What is a Hydroxide ion?The hydroxide ion is a negatively charged molecule that made up when hydrogen atom bonded to oxygen atom at 1:1 form. It acts as a base that forms ionic compounds when bonded to a positively charged ion molecule.
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A 10 liter tank of CO2 is at a pressure of 3.5 atm and a temperature of
25°C. How many moles of CO2 are in the tank?
The moles of CO2 are in the tank is mathematically given as
n=1.431
What are moles of CO2 are in the tank?Question Parameters:
A 10-liter tank of CO2 is at a pressure of 3.5 atm and a temperature of
25°C.
Generally, the equation for the ideal gas is mathematically given as
PV=nRT
Therefore
n=PV/RT
n=354.638kpa*10/8.314 J/mol·K *298k
n=1.431
In conclusion, moles of CO2 is in the tank is
n=1.431
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How noble gases are important for the stability of an atom?
Answer:
they are most stable
Explanation:
due to having maximum number of valence electrons their outer shell can hold.
they rarely react with other elements since they are already stable.
PLEASE HELP I NEED RIGHT NOW 30 POINTS!!
A boat is at sea, where there are sea currents. The boat uses its engine against the currents and is stationary in the water. If the force generated by the boat to push it forward is 24,000 N, what can be said about the force applied by the current? It is zero.
A: It is zero
B: It is greater than 24,000 N.
C: It is less than 24,000 N and greater than zero.
D: It is exactly 24,000 N.
Answer:
D
Explanation:
according to newtons 3rd law action is accompanied by an equal reaction that is equal in magnitude but opposite in direction so magnitude of force should be same
If the force generated by the boat to push it forward is 24,000 N, force applied by the current is exactly 24,000 N. Therefore, the correct option is option D.
What is force?A force in physics is an effect that changes the velocity of a mass-moving object, causing it to accelerate from rest, for example. It is a vector quantity since it's capable of being a push or a pull and always has magnitude and direction. It is denoted by the letter F and is measured in newtons (N), the SI unit of force.
The net force that an object experiences is equivalent to the pace that its momentum varies over time, according to Newton's second law in its original formulation. This equation suggests that an object's acceleration seems inversely proportional to the total force that it experiences if the item's mass remains constant. If the force generated by the boat to push it forward is 24,000 N, force applied by the current is exactly 24,000 N.
Therefore, the correct option is option D.
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Please help its urgent
Answer:
C
Explanation:
I picked C because the plant is interacting with the sun which is a nonliving part of the environment.
A, B and D are wrong because seaweed, horses, and trees are living things.
Answer:
C) A plant bending towards the sunlight
Explanation:
A) is incorrect because both the lobster and the seaweed are organisms! Likewise, so are B) and D). D) might seem a little tricky, but ultimately the squirrel is interacting with the tree by living inside it.
A plant bending towards the sunlight, however, is an organism having a response to a factor in its environment.
Please help! Choose one of the chemical reactions seen in the images on the last activity 1. Explain what happens in terms of energy/ enthalpy change. 2. Is AH negative or positive? The reaction choices are Fire, Photosynthesis, condensation, cokking an egg, or melting ice you can choose any one.
Answer:
there's no images we need pictures
Balance the three equations below by adding the coefficient next to the element(s).
Cr2O3 + 3Mg —> __Cr + 3MgO
__H2 + 1O2 —> 2H2O
2 NaBr + Cl2 —> __NaCl + Br2
Answer:
2Cr
2H2
2NaCl
Explanation:
Why is better separation of two liquids achieved by slow rather than fast distillation?.
Answer:
A one mL per minute rate (or slower) is recommended for best results in a fractional distillation; simple can go faster. Slow, gradual distillation essentially allows the best equilibration and heat transfer. If you heat too fast, vapors may not condense as quickly as desired, and may waste some of the column.
PLEASE JUST PLEASEEE ANSWER THEM PLSSSS!!! I can’t fail bro plsss
Explanation:
K = °C + 273
1. -234 + 273 = 39K
2. 84 + 273 = 357K
3. 70 + 273 = 343K
4. -24 + 273 = 249K
5. 134 + 273 = 407K
6. 120 + 273 = 393K
-234 °C = 39K
84 °C = 357K
70 °C = 343K
-24 °C = 249K
134 °C = 407K
120 °C = 393K
Answer:
-234°C = 39K
84°C = 357K
70°C = 343K
-24°C = 249K
134°C = 407K
120°C = 393K
Explanation:
Hope it helps:)
Which statement is true about molecule speed? (1 point)
a. Faster molecules have more energy than slower molecules.
b: Slower molecules are smaller than faster molecules.
c;Slower molecules are oriented better than faster molecules
d:Faster molecules have fewer collisions than slower molecules.
Faster molecules have fewer collisions than slower molecules is True about molecular speed.
What is Molecular speed?Molecular speed refers to the average distance gases or molecules travelled atca particular time rate.
It is valid in ideal gas, where the molecules do not interact with others.
Average molecular speed = Square root (3 (ideal gas constant) * (Temperature)/m)
Therefore, Faster molecules have fewer collisions than slower molecules is True about molecular speed.
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Pressure is defined as _______.1
Answer:the perpendicular force per unit area
pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.
Explanation:
mark me brainliest!!
10. The hottest stars in the sky are A about 200,000°c B about 5,800°c C about 22.000.
Help this is timed ! help me please
Answer: 22,000 C
Explanation:
Break the numbers apart to make them smaller then multiply and add them back to the big number and there is your answer
Answer:
The hottest known star, WR 102, is one such Wolf-Rayet, sporting a surface temperature more than 35 times hotter than the Sun.
Wolf-Rayet stars come in a variety of flavors.So I'd say B about 5,800°cHope this helps, have an awesome day.Please someone help me ASAP. This assignment is due in 10 min!!
Answer:
Baseball: PE
Satellite: KE
Sky Diver: KE
Basketball: PE
Arrow: KE
Cliff Diver: PE
Swinging Girl: PE
Grasshopper: PE
Bobsled: KE
Slingshot: PE
Explanation:
For a thrown object, KE and PE are in a sort of equilibrium. As the object climbs towards its highest point, it slows down as the initial KE that initiated the movement runs out. At the highest point, it is out of kinetic energy and full of potential energy. Gravity then pulls on the object and causes it to accelerate, thus giving it more KE. The PE at the top of the arc is because at that point, the object has the potential to fall to earth. This is the reasoning behind the baseball, swinging girl, and grasshopper.
This is, in a way, the same reasoning behind the other potential energy cases as well. The basketball, cliff diver, and slingshot are all about to start moving. The first two will be pulled by gravity and the last one will be propelled be the stretchy slingshot material attempting to snap back into place.
All of the KE examples are due to the object or person actively moving towards or around something. This means that they have kinetic energy--the energy of movement!
Answer:
Baseball: Potential Energy
Satellite: Kinetic Energy
Sky Diver: Kinetic Energy
Basketball: Potential Energy
Arrow: Kinetic Energy
Cliff Diver: Potential Energy
Swinging Girl: Potential Energy
Grasshopper: Potential Energy
Bobsled: Kinetic Energy
Slingshot: Potential Energy
Explanation:
In which section(s)/point(s) is the car not moving/at rest?
Answer:
a-b and e-f
Explanation:
No change in distance during these periods as there is change in time.
Answer:
[tex]\huge\boxed{\sf\: e \: -\: f \:\: and \:\: a \: -\: b}[/tex]
Explanation:
The car is not moving / is at rest from section(s) e to f & a to b.
Here, from e to f & a to b, we can see in the distance-time graph that the car shows no motion & is present in the same direction even though the time changes. Hence, we can infer that the car is at rest.
If the line goes up then the speed increases, if it's moving down then the speed decreases & if the line is the same then the car is at rest.
[tex]\rule{150}{2}[/tex]
A gas sample has a volume of 25.0 milliliters at a pressure of 1.00 atmosphere. If the volume increases to 50.0 milliliters and the temperature remains constant, the new pressure will be
Answer:
P2 = 0.5
Explanation:
V1 = 25.0ml (must be convert to L) = 0.025L
P1 = 1.00 atm
V2 = 50.0ml = 0.05L
P2 =?
To calculate this question, must follow this equation below
P1V1 = P2V2
1.00 x 0.025 = P2 x 0.05
0.025 = P2 x 0.05 (divided both sides by 0.05 to left P2)
0.5 = P2
So 0.5 is the answer!
Write the balanced chemical equation for the combustion of docosane C22H46.
Please help!! :(
What is the percentage of oxygen in carbon dioxide (CO2)
Explanation:
carbon dioxide has a percent composition of 72.7% oxygen, i.e. for every 100 g of carbon dioxide you get 72.7 g of oxygen.
Type the correct answer in the box. Express your answer to three significant figures. Calcium nitrate reacts with sodium phosphate to form sodium nitrate and calcium phosphate. Given 96. 1 grams of calcium nitrate, what’s the theoretical yield of calcium phosphate? Use the periodic table and the polyatomic ion resource. The mass of calcium phosphate the reaction can produce is grams.
6.07 grams is the theoretical yield of calcium phosphate (Ca₃(PO₄)₂).
How we calculate mass from moles?Mass of any substance can be calculated by using moles as:
n = W/M, where
W = required mass
M= molar mass
Given chemical reaction is:
3Ca(NO₃)₂ + 2Na₃PO₄ → 6NaNO₃ + Ca₃(PO₄)₂
From the stoichiometry it is clear that:
3 moles of Ca(NO₃)₂ = produce 1 mole of Ca₃(PO₄)₂
Given mass of Ca(NO₃)₂ = 96.1g
Mole of Ca(NO₃)₂ = 96.1g/164g/mol = 0.5859moles
So, 0.5859 moles of Ca(NO₃)₂ = produce 0.5859×1/3 = 0.0196 moles of Ca₃(PO₄)₂
Required mass of Ca₃(PO₄)₂ will be calculated by using moles as:
W = 0.0196mole × 310g/mole = 6.07 grams
Hence, 6.07 grams is the theoretical yield of calcium phosphate.
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Why is water less dense when it is in a frozen state.
Answer: Your answer is, close to the freezing point, the water molecules start to arrange locally into ice-like structures. This creates some "openness" in the liquid water, which tends to decrease its density.
Hope this helps!
A sample of sulfur dioxide (SO2) is initially at a temperature of 105C, a volume of 15 L, and a pressure of 1.5 atm. If the volume changes to 25 L and the temperature increases to 181C, what is the new pressure? Show your work.
The new pressure is 1.08 atm
Gas lawsFrom the question, we are to determine the new pressure
Using the General gas equation,
[tex]\frac{P_{1}V_{1} }{T_{1}} = \frac{P_{2}V_{2} }{T_{2}}[/tex]
Where
P₁ is the initial pressure V₁ is the initial volumeT₁ is the initial temperature P₂ is the final pressure V₂ is the final volume T₂ is the final temperatureFrom the given information,
P₁ = 1.5 atm
V₁ = 15 L
T₁ = 105 C = 105 + 273.15 = 378.15 K
V₂ = 25 L
T₂ = 181 C = 181 + 273.15 = 454.15 K
P₂ = ?
Putting the parameters into the equation, we get
[tex]\frac{1.5 \times 15}{378.15} = \frac{P_{2} \times 25 }{454.15}[/tex]
[tex]P_{2}= \frac{1.5 \times 15 \times 454.15}{25 \times 378.15}[/tex]
P₂ = 1.08 atm
Hence, the new pressure is 1.08 atm
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Using information from the periodic table,
explain why radium forms chemical bonds in the
same way as calcium does.
Bothe calcium and radium are second group elements in periodic table with two valence electrons. They exhibit similar physical and chemical properties.
What are groups in periodic table?All the elements in periodic table are classified into different groups and periods. The horizontal rows in periodic table are called periods. From left to right in a period the atomic number increases.
The vertical columns in the periodic table are called groups. Down a group the number of shells increases thereby the atomic size also. A group contains elements with same number of valence electrons and similar physical and chemical properties.
Calcium and radium are in the second group of periodic table and they are called the alkaline earth metals. Both contains two valence electrons and they will participate in chemical bonding by losing these two electrons and thus are divalent cations.
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Calculate the volume of 0. 410 moles of hydrogen at 47. 0° C and 1. 20 atm, R=. 0821
Answer:
V = 9
Explanation:
n = 0.410
T = 47.0C (must be convert to K by + 273.15) = 320.15 K
P = 1.20 atm
R = 0.08205
V = ?
To solve this equation, we must follow the equation below:
PV = nRT
1.20 x V = 0.410 x 0.08205 x 320.15 K
1.20 x V = 10.8
V = 9
So the answer is 9.
An entire, intact organism may be preserved in ____ and ____. A. imprints; petrified B. amber ; ice C. casts; trace fossils D. molds , cast
letter B
Explanation:
An entire, intact organism may be
preserved in amber and ice
which of the following is one part of a chemical formula
1. a number that shows the total atomic mass of the substance
2. the full name of each element shown
3. the symbol of each element in the substance
Answer:
3. the symbol of each element in the substance
Explanation:
Which particle has a mass of
9.11 x 10-28 g and charge of -1?
electron
proton
neutron
Convert 30.0g NaNO3 to moles
please help
Answer:
0.4moles
Explanation:
1 grams NaNO3 to mol = 0.01177 mol
30 grams NaNO3 to mol = 0.35296330934634 mol
but if we round that up it is 0.4moles
Ammonia (NH3(g), Delta. Hf = –46. 19 kJ/mol) reacts with hydrogen chloride (HCl(g), Delta. Hf = –92. 30 kJ/mol) to form ammonium chloride (NH4Cl(s), Delta. Hf = –314. 4 kJ/mol) according to this equation: NH3(g) HCl(g) Right arrow. NH4Cl(s) What is Delta. Hrxn for this reaction? kJ.
The change in enthalpy of the given reaction is 175.91 kJ/mol, which shows that reaction is exothermic.
How we calculate ΔH for the reaction?Change in enthalpy for the overall reaction will be calculated as:
ΔH = Enthalpy (H) of the product - Enthalpy (H) of the reactant
Given chemical reaction is:
NH₃(g) + HCl(g) → NH₄Cl
Heat of enthalpy of NH₃ = -46. 19 kJ/mol
Heat of enthalpy of HCl = -92. 30 kJ/mol
Heat of enthalpy of NH₄Cl = -314. 4 kJ/mol
Enthalpy of the reaction is calculated as:
ΔH = -314. 4 - [-46. 19 + (-92. 30)]
ΔH = -314. 4 - (-138.49)
ΔH = -175.91 kJ/mol
Hence, ΔH for the reaction is -175.91 kJ/mol.
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