True or false? IF we start with an acute angle... the pattern is for the 8 angles are.... ao, oa, ao
what is the ka for a 0.25 m solution of a monoprotic weak acid with a ph of 4.65
Answer:
ka = 2x10⁻⁹
Explanation:
Using the pH we can calculate the molar concentration of H⁺, [H⁺]
pH = -log[H⁺] = 4.65[tex]10^{-4.65}[/tex] = [H⁺] = 2.24 x 10⁻⁵ MThen we use the expression of Ka for the equilibrium of a weak monoprotic acid:
HA ↔ H⁺ + A⁻
Where:
ka = [tex]\frac{[H^+][A^-]}{[HA]}[/tex]
ka = [tex]\frac{(2.24*10^{-5})(2.24*10^{-5})}{0.25-2.24*10^{-5}}[/tex] = 2x10⁻⁹
Answer correctly for a brainlesit!
What is seen as the moon moves from a new moon to a full moon?
a
The amount of light the moon gets stays constant
b
We see more light and then less light
c
The amount of light the moon is receiving decreases
d
The amount of light we see on the moon is increasing
Answer:
The correct answer would be (d)- The amount of light we see on the moon is increasing
Explanation:
If I got this right then please give me brainliest! If not, let me know the correct answer......:)
When elements form bonds, it changes their ______ properties.
The answer is..?
Answer:
chemical and physical
When elements form bonds, it changes their chemical and physical properties.
What is element ?A chemical element is a species of atoms, including the pure material made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.
A material that cannot be further decomposed by any chemical reaction is known as a chemical element. Each element's atom has a specific number of protons.
For instance, a carbon atom has six protons compared to the one proton in a hydrogen atom. Ions are created by changing the number of electrons in an element's atom.
Thus, When elements form bonds, it changes their chemical and physical properties.
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Which of the following best describes where cellular respiration occurs?
Answer:
In every body cell
Explanation:
Answer: in every body cell
Explanation:
1. Ozone in Earth’s atmosphere is important because it
A)absorbs harmful pollution.
B)absorbs harmful radiation.
C)helps clouds form.
D)causes rain to fall.
2.
A. a
B. b
C. c
D. d
Answer:
B
Explanation:
A tennis ball is hit into the air with a racket. When is the ball’s kinetic energy the greatest? Ignore air resistance.
A when it leaves the racket
B just before it reaches the ground
C when it reaches its maximum height
D when its kinetic energy and potential energy are equal
E just before it starts falling downward
Answer:
E. just before it reaches the ground.
Explanation:
The "kinetic energy" refers to the energy when an object moves or is in motion. When the ball leaves the racket, it is considered to have a great amount of kinetic energy. However, this decreases as the ball reaches its maximum height, but the potential energy is at its highest. Upon falling down, its kinetic energy increases but its potential energy decreases.
Provided that there's no air resistance, the speed of falling is even faster for the ball because of gravity and nothing is slowing it down, which means it will have a maximum kinetic energy just before it reaches the ground.
What is the amount of heat energy absorbed when 36 grams of ice at -20oC is melted to water at 0oC?
Answer:
Q = 1461.6 J
Explanation:
Given data:
Mass of ice = 36 g
Initial temperature = -20°C
Final temperature = 0°C
Amount of heat absorbed = ?
Solution:
specific heat capacity of ice is 2.03 j/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1
ΔT = 0°C - (-20°C)
ΔT = 20°C
Q = 36 g ×2.03 j/g.°C×20°C
Q = 1461.6 J
which outcome resaults when a liquid is heated
Answer:
evaporation
Explanation:
What is the element Rao (Hint: it's from the periodic table)
Answer:
The table shows element percentages for RaO (radium oxide).
Element %
O 6.61
Ra 93.39
Explanation:
Hope this helps - good luck ^w
6th grade science i mark as brainliest
Answer:
A: 60 hours
Explanation:
Which type of data do scientist used to predict tornadoes wind flow in temperature cloud cover and wind flow moisture levels and temperature cloud cover and moisture levels
Answer:
Wind flow and temperature
Explanation:
There is a answer on brainly to this question already
Answer:
I do K12 its wind flow and temp.
Hope this helps,
0Drink0Milk0
When 40g of ammonium nitrate explode 14g of nitrogen and 8g of oxygen form. How many grams of water form?
answer and Explanation:
the same amount would have to stay in grams, so if 14 grams of nitrogen is formed, then 8 grams of oxygen, add those two together and you get 22. and that's 22 of the 40 grams used, so 40 su
Which is a characteristic of colloids?
Answer:
A colloid is a mixture composed of particles in a dispersing medium. A colloid is defined by the size of the particles involved. If the particles in a mixture are on the scale of individual molecules, around 1 nanometer, it is defined as a solution. If the particles are larger than 1,000 nanometers, it is a suspension.
Explanation:
i hope this helps you!
The characteristics of colloids are (i) It is a heterogeneous solution (ii) Two phases are present in this solution (iii) It exhibit Tyndall effect (iv) It also exhibit Brownian movement.
What is Colloids ?Colloids is also called Colloidal system or Colloidal solutions are mixture in which one substance microscopically dispersed insoluble particle is suspended throughout another substance.
What are the characteristics of colloids ?The characteristics of colloids are:
Colloids is a heterogeneous mixture. The colloidal solution is turbid. In colloidal solution two phases are present in the solution. One is dispersed phase and another is dispersion phase. Colloidal solution diffuse slowly. It exhibit Tyndall effect. It exhibit Brownian movement.Thus from the above conclusion we can say that The characteristics of colloids are (i) It is a heterogeneous solution (ii) Two phases are present in this solution (iii) It exhibit Tyndall effect (iv) It also exhibit Brownian movement.
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Group 18 noble gases are relatively inert because *
their s and p orbitals are filled (outer energy level is filled).
they can have either a positive or a negative charge.
their outermost energy level is missing one electron.
they readily form positive ions.
Answer:I believe its A. There noble gasses so there happy with there electron count!
Explanation:
Group 18 noble gases are relatively inert because their s and p orbitals are filled, meaning their outer energy level is filled. Therefore option 1 is correct.
The noble gases, which include elements like helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn), belong to Group 18 (VIII A) of the periodic table.
These elements have a full complement of electrons in their outermost energy level, also known as the valence shell. This outermost energy level is comprised of s and p orbitals.
Having a filled outer energy level makes noble gases highly stable and unreactive. The stability arises from the fact that their electron configurations are complete, meaning they have achieved a configuration similar to the noble gas that precedes them in the periodic table.
Because noble gases have no missing or unpaired electrons in their outer energy levels, they have little tendency to gain, lose, or share electrons with other atoms.
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Which of these is NOT a cation?
A) K+
B) Mg2+
C) NH4+
D) Cl-
Answer:D) Cl-
Explanation:
Only cations are positive (+)
Cations are positively charged ions. Negatively charged ions are called anions. Among the given ions, Cl- is not a cation. It is an anion.
What are ions ?Ions are charged atoms formed by loss or gain of electron by atoms. Atoms with extra electrons or electron deficient will loss or gain electrons in order to achieve octet.
When atoms loss electrons, the number of their protons become dominant and they acquire positive charge. When atoms gain electrons the number of electrons become dominant and atoms become negative charged.
The positive charged ions are called cations and negative charged ions are called anions. For example when potassium K loss one electron, it forms K+ ion. Similarly when Cl gain an electron it forms the anion Cl-.
Therefore, the one which is not cation among the given ions is Cl-.
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how many elements does hydrochloric acid have
Answer:
Hydrogen chloride (HCl), a compound of the elements hydrogen and chlorine, a gas at room temperature and pressure. A solution of the gas in water is called hydrochloric acid.
Explanation:
hoped that helped
Select the options that are properties of electromagnetic waves:
Answer:
They propagate in materialistic media and non-materialistic media ( space ) .
They propagate in the space at constant velocity , which is 3 × 108 m/s .
They consist of vibrating electric and magnetic fields at certain frequency in phase with each other , perpendicular to each other and perpendicular to the direction of the wave propagation ...
Explanation:
welcome!
The properties of electromagnetic waves are the electromagnetic waves are propagated by oscillating electric fields and magnetic field oscillation at right angles to each other, These waves travel with speed 3×108ms−1 in vacuum. Therefore, option A and B are correct.
What are electromagnetic waves ?The term electromagnetic waves or EM waves are defined as the waves that are produced as a result of vibrations between an electric field and a magnetic field. In other words, EM waves are made up of oscillating magnetic and electric fields.
They are created in different processes and are detected in different ways, but they are not basically different. Radio waves, gamma-rays, visible light, and all the other parts of the electromagnetic spectrum are electromagnetic radiation.
Thus, option A and B are correct.
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Your question is incomplete, most probably your question was
Select the options that are properties of electromagnetic waves:
A. Electromagnetic waves are propagated by oscillating electric fields and magnetic field oscillation at right angles to each other.
B. These waves travel with speed 3×108ms−1 in vacuum.
C. They are deflected by electric or magnetic field.
D. They can not show interference or diffraction.
How do metals become stable?
Answer:
Atoms of metal elements give away electrons in their reactions to form positive ions. The ions formed have a full outer electron shell, so are very stable.
Explanation:
To become stable, the metal atom wants to get rid of one or more electrons in its outer shell. ... Alternately, an atom that loses electrons becomes a positively charged ion (aka cations). The particles in an ionic compound are held together because there are oppositely charged particles that are attracted to one another.
9. When 4.46 moles of ethylene, C2H4, burns in oxygen to give carbon dioxide and
water, how many grams of carbon dioxide are formed?
C2H4 + 3 O2 → 2 H2O + 2 CO2
How many grams of carbon dioxide are formed??
Answer:
4.46 moles of Ethylene will produce 392.48 grams of Carbon dioxide.
Explanation:
The reaction is as follows
C2H4 + 3 O2 → 2 H2O + 2 CO2
For complete combustion of Ethylene 1 mole of ethylene gives 2 moles of Carbon dioxide.
using unitary method
1 C2H4 => 2CO2
4.46 of C2H4 => 2*4.46 CO2
= 8.92 CO2
No of moles = given mass(w) /molar mass(M)
Molar mass of CO2 = 44g
8.92 = W / 44
W = 8.92 * 44
= 392.48g
So 4.46 moles of Ethylene will produce 392.48 grams of Carbon dioxide.
4.46 moles of ethylene burns in oxygen to give 393 g of carbon dioxide and water.
What is combustion?Combustion, or burning, is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.
Let's consider the reaction for the combustion of ethylene.
C₂H₄ + 3 O₂ → 2 H₂O + 2 CO₂
We can calculate the mass of CO₂ formed by the combustion of 4.46 moles of C₂H₄, considering the following relationships.
The molar ratio of C₂H₄ to CO₂ is 1:2.The molar mass of CO₂ is 44.01 g/mol.4.46 mol C₂H₄ × (2 mol CO₂/1 mol C₂H₄) × (44.01 g CO₂/1 mol CO₂) = 393 g CO₂
4.46 moles of ethylene burns in oxygen to give 393 g of carbon dioxide and water.
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Is this a scientific model? Use complete sentences to explain why or why not. (5 points)
help quick
Answer:
yes
Explanation:
In a Covalent bond which statement is true
Answer:
correct is A, but it isn't quite right. Only when the electronegativity values of the two atoms are the same will the bond be 100% covalent.
Explain three main differences between bacteria and virus.
Which of the following groups of subjects are categorized under natural science?
a.
Geography, History and Civics
b.
Biology, Chemistry and Physics
c.
Chemistry, Mathematics and Civics
d.
Civics, Mathematics and Physics
Answer:
i guess b is the answer.hope it will help
what is the mass number of a carbon isotope with 10 neutrons
Answer:
16 because carbon atom having usual 6 neutron have a mass number of 12 and that with 7 neutron has mass number of 13
Calculate the number of molecules in 0.5 moles of Sodium sulfate (Na2SO4)?
Answer: ??? molecules Na2SO4 (no rounding; make sure to include scientific notation when necessary)
Answer: The formula mass for sodium sulfate was calculated on page T-9. Referring to those numbers, the formula Na2SO4 means: two moles sodium (45.98 g), one mole is (32.06 g.
Explanation: Your welcome.
What is it called when individual water molecules on the surface of a liquid gain enough motion energy (kinetic energy), they leave the liquid to become a gas.
Answer:that is called Evaporation!
Explanation:
What are three properties of metals?
Help PLZ!!!
Answer:
Luster: Metals are shiny when cut, scratched, or polished.
Malleability: Metals are strong but malleable, which means that they can be easily bent or shaped. ...
Conductivity: Metals are excellent conductors of electricity and heat.
Three properties of metals are:
Good conductors of electricity and heatMalleabilityDuctilityGood conductors of electricity and heat: Metals have a high electrical and thermal conductivity, meaning they allow the flow of electricity and heat through them with ease. This property makes metals valuable in various applications, such as electrical wiring and heat transfer.
Malleability: Metals can be easily shaped and molded into various forms without breaking. They can be hammered, rolled, or pressed into thin sheets without losing their structural integrity. This property allows metals to be used in manufacturing processes and the creation of different products.
Ductility: Metals can be drawn into thin wires without breaking. This property makes them suitable for electrical wiring and cable manufacturing, where flexibility is required.
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**Please Help** -
why is the equation 3HCl + Al = AlCl3 + H2 unbalanced?
Answer:
because its supose to be 3HCL+3AL___3ALCL+H³
Which of the following is the CORRECT FORMULA for an element from GROUP 2
bonded to an element from GROUP 16 (6A)?
A. MgS2
B. Ca2S6
C. BeO
D. Sr2S2
