The nucleus is the atom's central core and contains more than 99.9 percent of its mass. Surrounding the nucleus is a cloud of electrons, which makes up most of the atom's volume.
In the reaction 2H₂ + O₂ → _H₂O, what coefficient should be placed in front of H₂O to balance the reaction?
A. 1
B. 2
C. 3
D.4
Answer: B.2
Explanation: math
How is chemical weathering different from physical weathering?(1 point)
Chemical weathering involves plants and animals, while physical weathering does not.
Chemical weathering requires a reaction with water, while physical weathering does not.
Chemical weathering forms new substances, while physical weathering does not.
Chemical weathering results in the breakdown of rock, while physical weathering does not.
Chemical weathering different from physical weathering because chemical weathering results in the breakdown of rock, while physical weathering does not
Chemical weathering involve the interaction of rock with minerals solution to change the composition of rock in this process water interact with minerals to create various chemical reaction and transform the rock and physical weathering is the process that cause disintegration of rock, minerals soil without chemical change that's why chemical weathering different from physical weathering because chemical weathering results in the breakdown of rock, while physical weathering does not
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look at the periodic table. each horizontal row shows a... what is the missing word?
Answer:
Groups
Explanation:
groups are located horizontally
What causes lightening? Describe each step involved in the forming of lightening. And give an example of a similar process from everyday life.
Lightening is caused by imbalance between storm clouds and ground , but most probably lightening occurs due imbalance between clouds.
What is lightening and how it occurs?We have already studied about positive and negative charges in earlier classes , about their behavior too.Positive charge and negative charge if placed on a zone share a mutual attraction behavior.Prior to lightening occurs the negative charges of the bottom of the cloud and the positive charges present on the ground attracts.When attraction attains the peak they comes closer to either discharge or to balance the charges.We hear a sound when lightening occurs and calls it thunder, actually when lightening occurs the explosion of heat creates a sound of thunder.To know more about lightening visit :
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I NEEED HELP on science air resistance
Answer:
Air resistance, which is also known as drag, is a kind of friction (a force that opposes motion) which occurs between air and another object. It is the force that the object experiences as it passes through the air. Air resistance and gravity are the two fixed forces of nature which move on any object on Earth.
Choose the object which will have the most momentum.
A baseball with a mass of 150 g and a soccer ball with a mass of 450 g are both thrown with a force of 5 m/s.
A: baseball
B:Soccer ball
The momentum of a soccer ball will be greater than the momentum of a baseball.
What is momentum?The momentum of an object can be defined as the function of the mass of the object and its velocity. Momentum (p) can be measured as the kinetic energy of the object and is the multiplication of mass (m) and velocity (v).
The mathematical equation to determine the momentum of an object is equal to:
p = m×v
The momentum is the conserved quantity and will be zero if the object is steady and its velocity of an object is zero.
Given, the mass of the baseball, m = 150g = 0.15 Kg
The velocity of the baseball, v = 5 m/s
The momentum of the baseball will be equal to :
p = 0.15 ×5
p = 0.75 Kg.m/s
The mass of the soccer ball, m = 450g = 0.45 Kg
The velocity of the soccer ball, v = 5 m/s
The momentum of the soccer ball will be equal to :
p = 0.45 ×5
p = 2.25 Kg.m/s
Therefore, the momentum of the soccer ball is greater.
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.need this answer asap
In gases, the particles travel quickly in all directions and regularly collide with one another and the container wall. The particles acquire more kinetic energy and accelerate with rising temperature.
What are gas particles ?There is not much attraction between the particles in a gas. In comparison to the particles in a solid or liquid, they are extremely widely apart and are always moving. The particles simply strike and bounce off of one other when they collide, without engaging in any interaction.
There is no regular structure and the particles in a gas are well separated. Despite having no regular arrangement, fluids are close to one another. Typically in a regular pattern, solids are densely packed.Learn more about Gas particles here: https://brainly.com/question/16982523
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A chemical reaction between X2 (red) and Y2 (blue) produces XY (red-blue). All compounds are in a gaseous state and each molecule represents 0.10 bar of that reactant or product. The picture shown here represents the equilibrium mixture.
There are six blue-blue clusters composed of two fused blue spheres, three red-red clusters composed of two fused red spheres, and seven red-blue clusters composed of a red sphere fused with a blue sphere.
Calculate the equilibrium constant for this reaction
The equilibrium constant for this reaction is 1.65.
Solution:
X2: 3, Y2: 6, XY: 7
X₂ + Y₂ ⇌ 2XY
Kc = [XY]² / [X₂][Y₂] = [7]²/[3][6] = 2.72
1mole of equation √(2.72) = 1.65
The equilibrium constant of a chemical reaction is the value of the reaction quotient in chemical equilibrium the state to which a dynamic chemical system approaches when, after sufficient time, its composition exhibits no further measurable tendency to change. Q is the quantity that changes as the reaction system approaches equilibrium. K is the numerical value of Q at the end of the reaction when equilibrium is reached.
Balance Example A book on a table. A car that moves at a constant speed. A chemical reaction in which the forward and reverse kinetics are equal. The specific rate constant k is a constant of proportionality that relates reaction rate to reactant concentration. The rate laws and specific rate constants of chemical reactions must be determined experimentally. The value of the rate constant is temperature dependent.
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what is the maximum number of moles of p2o5 that can theoretically be made from 208 g of o2 and excess phosphorus?
The maximum amount of 2.6 moles of P2O₅ that can be produced theoretically from 208 g of O₂ and extra phosphorus.
Describe mole:An atom, molecule, or other specific material can be measured in enormous amounts using the standard scientific unit of the mole.
In the international system of units, it is also known as the material amount unit.
Briefing:P₄ + 5O₂ -> 2P2O₅
Mass of O₂ = 208g
Molar mass = 32g
So moles of O₂ = 208 / 32 = 6.5 mole
For reaction 5 mole of O₂ will give 2 mole of P2O₅
So 6.5 mole of O₂ will give
= 6.5 x 2 / 5 = 2.6 mole of P2O₅
Therefore, 2.6 moles of P2O₅ are the greatest amount that may theoretically be produced from 208 g of O₂ plus extra phosphorus.
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Which chemical property of alkanes is responsible for generating electricity in diesel
power stations or for moving motor vehicles?
Alkanes' comparatively low reactivity, which is a chemical property, is what allows diesel to produce energy. Strong acids, bases, oxidising, or reducing agents do not react with alkanes (reductants). Alkanes can be used as fuels because they burn quickly when exposed to oxygen and release energy.
What is Chemical property?
Any quality that can only be formed by altering a substance's chemical identity is referred to as a chemical property, and it can occur during or after a chemical reaction. Simply put, it is impossible to detect a substance's chemical properties by looking at it or feeling it; instead, a substance's internal structure needs to be significantly altered before its chemical qualities can be examined. A substance's properties will alter significantly as a result of a chemical reaction, leading to chemical change. A catalytic property, on the other hand, would also be a chemical property.
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boyle’s law states that when a sample of gas is compressed at a constant temperature, the product of the pressure and the volume remains constant: . find the rate of change of volume with respect to pressure\
The rate of change of volume with respect to pressure dP/dV = -C/P^2
What is Boyle's law?
Boyle's law is a gas law that states the pressure exerted by a gas (of a given mass and temperature) is inversely proportional to the volume it occupies. The gas law states that the pressure exerted by a gas (of a given mass and temperature) is inversely proportional to its volume.
In accordance with Boyle's law When the temperature remains constant, the relationship between pressure and volume is inversely proportion
P ∝ 1/V
PV = C
V= C/P
Boyle's law stipulates When the temperature is constant, pressure is inversely proportional to volume.
dP/dV = -C/P^2
Hence, this is the rate of volume change relative to pressure.
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Determine the mass in grams of 5.90 × 10²¹ atoms of barium. (The mass of one mole of barium is 137.33 g.)
Taking into account the definition of Avogadro's Number, the mass of 5.90×10²¹ atoms of barium is 1.345 grams.
Avogadro's NumberAvogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole.
Avogadro's number applies to any substance.
Mass of bariumYou can apply the following rule of three: if 6.023×10²³ atoms are contained in 1 mole of barium, then 5.90×10²¹ atoms are contained in how many moles of barium?
amount of moles of barium= (5.90×10²¹ atoms × 1 mole)÷ 6.023×10²³ atoms
amount of moles of barium= 9.796×10⁻³ moles
Then it is possible to apply the following rule of three: if 1 mole of barium contains 137.33 grams, 9.796×10⁻³ moles of barium contains how much mass of barium?
mass of barium= (9.796×10⁻³ moles× 137.33 grams)÷ 1 mole
mass of barium= 1.345 grams
In summary, the mass is 1.345 grams.
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Consider the following reaction and its equilibrium constant:
I2(g) + Br2(g) ⇌ 2 IBr(g) Kc = 1.1 × 10^2
A reaction mixture contains 0.49 M I2, 0.28 M Br2 and 3.5 M IBr. Which of the following statements is TRUE concerning this system?
a. The reaction quotient will decrease.
b. The reaction will shift in the direction of products.
c. The equilibrium constant will increase.
d. The reaction will shift in the direction of reactants.
e. The system is at equilibrium
Statement b) is true concerning this system. This conclusion can be reached by comparing the reaction quotient and the equilibrium constant.
To determine which is the correct answer (except c, which is obviously incorrect, the equilibrium constant isn't dependent on the concentrations of the reaction components), we need to calculate the reaction quotient (Q) and compare it to the equilibrium constant (K).
The expression for the equilibrium constant (and the reaction quotient) looks like this:
[tex]Q = \frac{[IBr]^{2} }{[I_{2} ][Br_{2} ]}[/tex]
Q = (3.5 M)²/(0.28 M * 0.49 M)
Q = 89 = 0.89 x 10²
This means that the reaction quotient is lower than the equilibrium constant (so the system is not at equilibrium, making option e) incorrect), which means that it will shift in the direction that will cause it to be equal to reach equilibrium. So, the reaction quotient will increase (making option a) incorrect) and the system will shift towards the product because increasing the concentration of the product and reducing the concentrations of the reactants.
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Which of these is an example of conclusion?
- Add different kinds of soil to three potted plants
- beach erosion increased during the last winter storm
- temperature changes may be due to wind patterns
- wonder why some layers of rocks contains fossils
Answer: C
Explanation:can’t be A starts with a word that begins in a intro can be b those are textual evidence can’t be D also referring to textual evidence in a first pattern of a end RACE or PEMDOS
1.write a general word equation for the reactions that occurred
2.Name another acid which can be used instead of hydrochloric acid
1. Write the name of the reactant carbonic acid Draw arrows to indicate the direction of the chemical reaction → Write the name of each product separated by a plus sign (+) to the right of the arrow carbon dioxide + water.
2. Sulphuric acid
Hydrochloric acid is also known as hydrochloric acid or hydrochloric acid. Since hydrochloric acid and hydrogen chloride are the same compounds, they have the same molecular formula HCl. However, in federal states it is different. Hydrogen chloride occurs in gaseous form at room temperature and pressure.
Dry acid is used in pools and spas to lower pH and maintain total alkalinity TA. It is safer and easier to use than hydrochloric acid. It is easy to store but requires careful handling. Hydrochloric acid and sulfuric acid are two strong acids. The main difference between hydrochloric acid and sulfuric acid is that hydrochloric acid is monobasic whereas sulfuric acid is dibasic.
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convert a length of 3450 um to dm
When we convert a length of 3450 micrometers to decimeters it would come out to be 3.45 × 10⁻⁴ decimeters .
What is a unit of measurement?A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind.
1 micrometer = 1 × 10⁻⁶ meters
3450 micrometers = 3450 × 10⁻⁶ meters
1 meter = 10⁻¹ decimeters
3450 × 10⁻⁶ meters =3450 × 10⁻⁶ × 10⁻¹ decimeters
=3.45 × 10⁻⁴ decimeters
Thus, 3450 um converted into dm would be 3.45 × 10⁻⁴ decimeters.
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Layla tested a group of fertilizers on her vegetable garden to see which would help her grow tomatoes with the greatest mass she section off her garden to test three different brands of fertilizer on for tomato garden at the same time one brand represented the one she uses all the time while the other two were knew which best explains the mistake that Lila made in her experiment?
The mistake that was made by Layla is that the experiment lacks a control.
What is an experiment?We know that an experiment is the way by which we are able to establish the cause and effect relationship between variables. We know that the whole essence of an experiment is to test the effect that the independent variable could have on the dependent variable.
In this case, we can see that there is the lack of a control variable. The control variable is what helps us to be able to ascertain the validity of the experiment and the control variable is lacking in this experiment.
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Describing the Organization of the Periodic Table
Use the drop-down menus to complete the statements.
A vertical column of elements in the periodic table is called a
A horizontal row of elements in the periodic table is called as
Atoms of elements in the same group have the same
As you move from left to right on the periodic table, the atomic number
1) group
2) – time
3) the number of valence electrons.
(4) raises
Which element is unusable?Outside of science, Nobelium has no uses. The biological function of nobelium is unknown. Due to its radioactivity, it is poisonous. Using a cyclotron, carbon is used to bombard curium to create nobelium.
It is said that we are going along a "group" in a periodic table when we move up or down a vertical column in the periodic table.
Similarly, it is said that we are travelling along a "period" in a periodic table when we move in a horizontal row from left to right or right to left.
The total amount of valence electrons affects how an element is categorized as belonging to a particular periodic table group.
The atomic number rises as one moves from left to right since the number of valence electron orbitals also rises in the same manner.
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Which of the following quantities are required for calculating density? Select all that required.
Volume
Area
Mass
Weight
Answer:
Mass and Volume
Explanation:
The formula for density is
[tex]\frac{Mass}{Volume}[/tex]
I’ll give you a lot of points for this
Calculate the number of joules giving off 32.0 g of steam cool from 110.0°C to ice at -40.0°C
Pls show work
In the CGS and S.I systems, the units of energy erg and joule are equivalent.
The symbols for joule and erg are (kg m2/s2) and (g cm2/s2), respectively.
110 + 40 = 150
150*32 = 4800 °C
What is Joules ?The International System of Units uses the joule as its unit of energy. It is equivalent to the amount of labor required to move a mass one meter in the direction of an applied newton of force.
The joule (J), which equals one newton metre, is the SI unit for energy (N m).
The work (or energy expended) by a force of one newton (N) operating over a distance of one meter is equivalent to one joule (m). A force of one newton causes a mass of one kilogram (kg) to accelerate by one meter per second (s) per second. So, one joule is equivalent to one newton meter.
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According to collision and transition state theories, what is the importance of activation energy?
A) Activation energy is increased when a catalyst is added.
B) Activation energy increases the temperature to heat up the transition state.
C) Activation energy provides enough energy for reactants to form the transition state.
D) Activation energy makes all reactions endothermic.
Which of the following best shows the basic three-step energy transformation for a battery-operated radio?
Responses
Acoustical → Mechanical → Electrical
Acoustical → Mechanical → Electrical
Mechanical → Acoustical → Chemical
Mechanical → Acoustical → Chemical
Chemical → Electrical → Acoustical
Chemical → Electrical → Acoustical
Electrical → Acoustical → Chemical
The energy transformation takes places in a battery operated radio is chemical energy to electrical energy then to sound energy or acoustical. Thus, fifth option is correct.
What is energy transformation?Energy can be transformed from one form to the other, For example, when we produce current from solar cells there occurs the transformation of light energy to electrical energy.
A battery contains two electrodes immersed in a molten electrolyte. When a potential difference is applied between these electrodes one of the electrode undergo reduction and the second one to oxidation.
The chemical energy produced from the electrolyte produce current and thus the energy is transformed to electrical energy. Using this electrical current the radio produces sound energy.
Therefore, the basic three- stage energy transformation for a battery operated radio is chemical energy to electrical energy then to sound energy or acoustical hence, fifth option is correct.
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Is copper chloride a solid or a gas?
Answer:
solid
Explanation:
A student was conducting an experiment in the laboratory that had a temperature of 272 °C. The student needed to log the temperature in Kelvin. What temperature should the student write down in Kelvin?
a
-1 K
b
136 K
c
0 K
d
545 K
Answer:
d 545K
Explanation:
0°C = 273K
so, 272°C = (273+272)K
enough of a monoprotic acid is dissolved in water to produce a 1.16 m solution. the ph of the resulting solution is 2.73 . calculate the ka for the acid.
The acid dissociation constant (Ka) for the acid is calculated to be 2.9 × 10^-6 M if the pH of the resulting solution is 2.73
The acid dissociation constant (Ka) is used to differentiate between weak and strong acids and in this case, can be calculated as follows;
Considering the chemical reaction:
HA ⇄ H⁺ + A⁻
Here HA is the acid that disassociates into the conjugate base of the acid (A⁻) and a hydrogen ion represented as H⁺
As the molarity of monoprotic acid is 1.16 M and the pH of the solution is 2.73, therefore;
[A⁻] = [H⁺] = 10^(-2.73)
[A⁻] = [H⁺] = 0.00186 M; equilibrium concentration
[HA] = 1.16 M - 0.00186 M
[HA] = 1.15814 M
Ka = [A⁻][H⁺] / [HA]
Ka = (0.00186)² / 1.15814 M
Ka = 2.9 × 10^-6 M
Therefore the Ka for the acid is calculated to be 2.9 × 10^-6.
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Please answer, I will mark brainliest
Answer:
Carbon Dioxide
Explanation:
"Carbon Dioxide is a pure substance made from two different elements so it is a compound."
hich option is an ionic compound?
Responses
NO2
upper case N O subscript 2 end subscript
SO3
upper case S O subscript 3 end subscript
CO
upper case C O
LiCl
NO₂ , SO₃ and CO are covalent compounds and LiCl is ionic in nature.
What are differences between covalent and ionic compounds?The definition of an ionic compound is chemical compound composed of ions which is held together by electrostatic forces i.e. held together by ionic bonds. They are formed by ions of opposite charge. The compound is neutral but it consists of a positively and negatively charged cations and anions.
Ionic bonds transfer electrons, covalent bonds share them more easily .Ionic compounds tend to have higher melting points and boiling points while covalent compounds have lower melting & boiling pointsIonic compounds have more polar molecules and covalent compounds lessOrganic compounds tend to have covalent bondsIonic compounds are usually between metal and a non-metal. Non-metal with non-metal compounds are covalent.Ionic compounds have ions in solution or in molten state and conduct electricityIonic bonds are stronger than covalent bondsIonic compounds tend to be a solid with definite shape at room temperature while covalent compounds are usually gases, liquids or soft solidsIonic compounds often do not dissolve in organic solvents while covalent compounds do.Learn more about ionic compounds at https://brainly.com/question/2687188
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Name the chemical that is added to drinking water to kill microbes.
Answer: chlorine
Explanation:
Chlorine is a chemical that is added to drinking water to kill parasites, bacteria, and viruses.
What is chlorination?Chlorination is the addition of chlorine to drinking water to kill microbes such as parasites, bacteria, and viruses. To achieve safe levels of chlorine in drinking water, different processes can be used.
The small amounts of chlorine in drinking water do not cause harmful health effects and give protection against waterborne disease outbreaks. Chlorinated water can smell and taste differently than untreated water.
When the chlorine is dissolved in water, it converts to an equilibrium mixture of chlorine, hydrochloric acid (HCl), and hypochlorous acid (HOCl).
Taste and smell can cause problems depending upon the water quality and amount of chlorine in the water. Chlorine levels up to 4 mg/L or 4 parts per million (ppm)) are assumed safe in drinking water external icons.
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6 of 106 of 10 Items
07:48
Above is an example of a food chain or pyramid. Ultimately, either directly or indirectly all organisms on this food chain get their energy from what single source?
A The earth.
B The snakes.
C the Plants.
D The sun.
Answer:
D
Explanation:
Plants manufacturer food through photosynthesis which depends on sunlight
I give you 20 pts if you can help me out, thx ahead of time, its really appreciated :3
Restate Rutherford's hypothesis and describe how you tested it.
Rutherford's gold foil experiment proved that an atom is mostly empty space with a tiny, dense, positively-charged nucleus.
What is Rutherford's gold foil experiment?Rutherford's gold foil experiment is defined as the positive-charged alpha particles struck a piece of gold foil. Most alpha particles passed through unharmed it has been observed that electrons are revolving around the nucleus.
Rutherford reasoned that the mass of the atom was distributed across the atom if Thomson's model was accurate.
Thus, Rutherford's gold foil experiment proved that an atom is mostly empty space with a tiny, dense, positively-charged nucleus.
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