Answer:
D. insufficient supply of oxygen
Explanation:
Combustion is an exothermic reaction which involves the burning of a compound in the presence of oxygen. Combustion is a very useful life process as it produces heat and light.
For a complete combustion reaction to occur, the compound must be burnt over excess oxygen. The product is usually carbondioxide and water with release of some particulate matter.
In incomplete combustion, there is deficiency of oxygen. Here, oxygen becomes the limiting agent and it drives the reaction to an end. Incomplete combustion is always accompanied with the production of poisonous carbon monoxide and Carbon. We see incomplete combustion when smoke forms or when burning is accompanied by production of soot.
What makes a combustive process complete or not is the availability of oxygen gas for the reaction.
which of the following best describes the process of hydration?
A. water transports weathered sediment from one place and deposits it in another
B. Water moving through soil carries away important nutrients
C. Water breaks existing bonds among elements in the minerals that make up a rock
D. water bonds with elements in the minerals that make up rock, forming new substances
Answer:
The correct answer is option D, that is, water bonds with elements in the minerals that make up rock, forming new substances.
Explanation:
A hydration reaction in chemistry refers to a chemical reaction in which a substance associates with water. In the process of weathering hydration takes place when a mineral captivates water to produce a novel substance. Hydration makes the rock to increase in volume that can impart tension on the rock and make it more susceptible to other kinds of weathering processes. The two prime illustrations of hydration comprise the formation of limonite from hematite and the formation of gypsum from anhydrite.
Answer:
D. water bonds with elements in the minerals that make up rock, forming new substances.
Hope this Helps!! :))
what property of air allows it to flow down to the floor?
I am not sure about my answer, but I think that it's density allows it to fall to the ground/floor.
The property of air that allows it to flow down to the floor is related to convection and density. Warmer air is less dense and rises, while cooler air is more dense, descends and flows down to fill the space left by the rising warm air.
Explanation:The property of air that allows it to flow down to the floor is related to the principles of convection and density. Specifically, warmer air is less dense than cool air. So, when air is heated, it becomes less dense and rises. Meanwhile, the cooler, denser air descends or flows down to replace the rising warm air. This constant switch involving the upward and downward movement of air as it heats and cools forms a convection current, leading to air's continual movement as it responds to changes in temperature.
For instance, in our homes, we often experience these changes in air movement. When we use a heater, it warms the air which then decreases in density and rises towards the ceiling. As that occurs, the cooler and denser air on the floor level is drawn upwards due to the displacement of the warmer air, causing a circulation - or convection current. The converse happens when we use an air conditioner or fan - cool air becomes denser and tends to flow down towards the floor level, pushing the warm air upwards.
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Rates of chemical reactions vary. Which of the following can affect the rate of reaction among atoms or molecules?
Answer:
D. All of these
Explanation:
Reaction rate is a measure of speed of a chemical reaction.
The following factors control reaction rates:
1. Nature of the reactants
2. Concentration of the reactants or pressure if gaseous.
3. Temperature
4. Presence of catalyst
5. Sunlight
The reaction rate is directly proportional to the concentration of the reactants. For gaseous systems, the pressure is directly proportional to the concentration and so pressure can be used in place of concentration.
Temperature change has a considerable effect on reaction rates since temperature is directly proportional to the average kinetic energy of reacting particles. Generally, reaction rate varies as temperature directly. For every 10°C rise in temperature above room temperature, it has been found that reaction rates becomes double or triple.
When temperature of a reacting system increases:
I. The kinetic energy of each of the reacting particles inceases
II. The frequency of ordinary colliosions and effective collisions per unit time increases.
III. Many of the reacting particles would require energy greater than or equal to the activation energy of the reaction.
A _______ property of salt is that it will _______ in water. A. physical; dissolve B. chemical; sink C. chemical; dissolve D. physical; corrode
Answer:
A
Explanation:
Dissolving a solid in liquid, in this instance table salt in water, is a physical change due to merely the state of the matter being altered. Physical changes almost always be reversed.
A A. physical property of salt is that it will dissolve in water.
Physical properties are characteristics that can be observed or measured without changing the substance's chemical identity. Examples include color, density, and solubility.
Chemical properties describe a substance's potential to undergo chemical changes or reactions and transform into a different substance. Examples include reactivity with acids and flammability.
When salt dissolves in water, it undergoes a physical change because the salt is merely dispersing at the molecular level within the water but remains chemically the same (sodium chloride). Therefore, dissolving is a physical property of salt.
How much heat energy is absorbed when 41.5g of ice melts at STP? (Picture Attached)
Answer:
= 13.857 kJ
Explanation:
The heat required to melt ice from its solid state to water or liquid states without change in temperature is given by the formula;
Heat = mLf ; where m is the mass of ice and Lf is the latent heat of fusion,
The mass of ice in moles = 41.5 g/18 g
= 2.306 moles
Therefore;
Heat = 2.306 moles × 6.009 kJ/mol
= 13.857 kJ
consider the following reversible reaction. C(s) + O2(g) CO2 (g) what is the equilibrium constant expression for the given system
Answer:
Equilibrium constant expression is the ratio of product of concentration of products and product of concentration of reactants.
Here K= [CO2]/[O2]
Note: Solids won't contribute to equilibrium constant expression since their activity is always one.
Answer:
B.)
Explanation:
________________ in the atmosphere and ocean creates wind and ocean currents.
A. conduction
B. convection
C. radiation
D. condensation
It's B - convection that is correct...
Answer:
B. convection
Explanation:
The sun heats the atmosphere and the surface of the Earth causing convection currents to develop in the atmosphere due to heated air that rise into the atmosphere.The ocean itself regulates temperatures at the lower parts of the atmosphere thus ensures the circulation of water in the ocean through currents and waves.At the equator, heated air loses its density, making it to rise, and when it reaches the troposphere it spreads towards the pole by convection.
how do i do a proper push up
Answer:
To do a proper push up
Explanation:
You need to keep your back straight, keep your hands at shoulder-width apart and keep your legs close but not too close.
Here's how to get set up to do a push up: When down on the ground, set your hands at a distance that is slightly wider than shoulder-width apart. Another good cue: draw a straight line down from your chest/nipple – it should be directly over your thumbnail.
Convert the following tempatures to K. A) 104 C b) -3 C
Answer:
104 c = 377.15 k
-3 c = 270.15 k
first correct awnser will be brainleist
In school, Jarrett learned that salt lowers the freezing point of water. He wants to test this in a home experiment.
Jarrett adds 100 mL of water at 25°C into each of three identical containers. He then adds 0 g of salt to the first container, 25 g of salt to the second, and 50 g of salt to the third container.
Which of the following is a constant in his experiment?
A the amount of water
B the starting temperature of the water
C the amount of salt
D the type of container
A. the amount of water is a constant (aka independent variable)
The amount of water is constant in the Jarrett in each of the three identical containers experiment.
What is a boiling point?The temperature at which a liquid boils and turns to vapour.
The water molecules need more energy to produce enough pressure to escape the boundary of the liquid.
The more salt (or any solute) added to water, the more you raise the boiling point.
When the ionic compound salt is added to the equation, it lowers the freezing point of the water.
Salt molecules block water molecules from packing together when the temperature is lowered.
It then prevents them from becoming ice. More water molecules leave the solid phase than the ones entering the solid phase.
Hence, option A is correct.
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Scientific theories and scientific laws are both based on extensive observations, experimentation, and reasoning. What is the primary factor that distinguishes scientific laws from scientific theories?
A. Scientific laws have been observed without exception in specific conditions.
B. Scientific laws frequently change over time.
C. Scientific laws tend to be conceptual and rarely use mathematics.
D. Scientific laws are always true, even when conditions change.
Answer:
Explanation:
Scientific laws have been observed without exception in specific conditions.
Answer:
Scientific laws have been observed without exception in specific conditions.
Explanation:
study island :)
A boy blows up a balloon and knots the end. He leaves it on the kitchen counter. His little sister finds it and takes it outside in the sunshine.
According to Charles's law, which of the answer choices best predicts what will happen to the balloon?
Its pressure will increase.
Its temperature will decrease.
Its volume will increase.
Its volume will decrease.
I pretty sure it’s (C) it’s volume will increase.
I hope this helped!
Answer : The correct option is, Its volume will increase.
Explanation :
According to the Charles' Law, the volume of the gas is directly proportional to the temperature of the gas at constant pressure and number of moles.
[tex]V\propto T[/tex]
That means the volume of gas is directly depends on the temperature of the gas.
As, the temperature of the gas increase, the volume of gas will also increases and vice-versa.
As per question, when a boy blows up a balloon and knots the end then he leaves it on the kitchen counter. When his little sister finds it and takes it outside in the sunshine then the volume of the balloon increases due to increase in the temperature.
Hence, the correct option is, Its volume will increase.
What might cause the average temperature of Earth to increase?
Plato users: increased levels of carbon dioxide from burning fossil fuels
Answer:
Explanation:
increased levels of carbon dioxide from burning fossil fuels
Fossil fuels release carbon dioxide into the atmosphere. The burning of fossils shoots up carbon emission and leads to gloabl warming.
Carbondioxide is one of the greenhouse gases. Others are methane, water vapour.
Incoming radiation that reaches the surface can either be reflected or be absorbed on the earth surface. The part that is absorbed helps keep surface temperature in check. The reflected component of the radiation can get trapped when they come in contact with greenhouse gases like carbondioxie. The gas prevents the radiation from escaping the earth.
As the radiation lingers, it shoots up the earth temperature significantly.
The more the gases in the atmosphere the more the temperature rises.
Carbondioxide emission from various sources, chief of which is through burning of fossil fuels in industrial processes and automobiles have become a global problem.
When the earth warms, polar ice would recede and add more water to hydrosphere. This has been one of the leading cause of the increasing level of inundation the earth has been plagued with over the years.
How does Arrhenius describe acids and bases?
As defined by Arrhenius:
An Arrhenius acid is a substance that dissociates in water to form hydrogen ions (H+). In other words, an acid increases the concentration of H+ ions in an aqueous solution. This protonation of water yields the hydronium ion (H3O+); in modern times, H+ is used as a shorthand for H3O+ because it is now known that a bare proton (H+) does not exist as a free species in aqueous solution.
An Arrhenius base is a substance that dissociates in water to form hydroxide (OH–) ions. In other words, a base increases the concentration of OH– ions in an aqueous solution.
Hope this helps!
Explanation:
According to Arrhenius concept:
An acid is defined as a substance which donates hydronium ions [tex](H_3O^+)[/tex] in water.
[tex]HA(aq)+H_2O(l)\rightarrow A^-(aq)+H_3O^+(aq)[/tex]
For example: hydrochloric acid , nitric acid etc.
[tex]HCl(aq)+H_2O(l)\rightarrow Cl^-(aq)+H_3O^+(aq)[/tex]
[tex]HNO_3(aq)+H_2O(l)\rightarrow NO_3^{-}(aq)+H_3O^+(aq)[/tex]
A base is defined as a substance which donates hydroxide ions [tex](OH^-)[/tex] when dissolved in water.
[tex]BOH(aq)\rightarrow B^+(aq)+OH^-(aq)[/tex]
For example: sodium hydroxide, calcium hydroxide etc.
[tex]NaOH(aq)\rightarrow Na^+(aq)+OH^-(aq)[/tex]
[tex]Ca(OH)_2(aq)\rightarrow Ca^{2+}(aq)+2OH^-(aq)[/tex]
Silver nitrate, AgNO3, can be used to test for the presence of chloride ions in solution, because it readily forms a precipitate of AgCl. What volume of 1.5 M AgNO3 will be required to react with 30.0 mL of a 0.45 M HCl solution?
Answer:
[tex]\boxed{\text{9.0 mL}}[/tex]
Explanation:
1. Write the balanced chemical equation.
AgNO₃ + HCl ⟶ AgCl + HNO₃
2. Calculate the moles of HCl
[tex]\text{Moles of HCl} =\text{30.0 mL HCl} \times \dfrac{\text{0.45 mmol HCl}}{\text{1 mL HCl}} = \text{13.5 mmol HCl}[/tex]
3. Calculate the moles of AgNO₃.
[tex]\text{Moles of AgNO}_{3} =\text{13.5 mmol HCl} \times \dfrac{\text{1 mmol AgNO}_{3}}{\text{1 mmol HCl}} = \text{13.5 mmol AgNO}_{3}[/tex]
4. Calculate the volume of AgNO₃
[tex]c = \text{13.5 mmol AgNO}_{3} \times \dfrac{\text{1 mL AgNO}_{3}}{\text{1.5 mmol AgNO}_{3}} = \text{9.0 mL AgNO}_{3}[/tex]
The titration will require [tex]\boxed{\textbf{9.0 mL}}[/tex] of AgNO₃.
Final answer:
To find the volume of 1.5 M AgNO3 required to react with 30.0 mL of a 0.45 M HCl solution, we can use the balanced equation. First, calculate the moles of HCl using volume × concentration. Then, calculate the volume of 1.5 M AgNO3 using the formula: moles ÷ concentration.
Explanation:
To find the volume of 1.5 M AgNO3 required to react with 30.0 mL of a 0.45 M HCl solution, we can use the balanced equation:
AgNO3 (aq) + HCl (aq) → AgCl (s) + HNO3 (aq)
First, we need to calculate the moles of HCl:
Moles of HCl = volume (L) × concentration (M)
Moles of HCl = 0.030 L × 0.45 M = 0.0135 mol
According to the balanced equation, 1 mole of HCl reacts with 1 mole of AgNO3. Therefore, we need 0.0135 mol of AgNO3.
Next, we can calculate the volume of 1.5 M AgNO3 using the formula:
Volume (L) = moles ÷ concentration (M)
Volume (L) = 0.0135 mol ÷ 1.5 M = 0.009 L = 9.0 mL
4. What electrons are involved in chemical bonding?
Answer:
The electrons that participate in chemical bonds are the valence electrons, which are the electrons found in an atom 's outermost shell.
Explanation:
Chemical bonding involves valence electrons, the electrons in an atom's outermost shell. There are two main types of bonds: ionic, which involves electron transfer, and covalent, which involves electron sharing.
Explanation:In the context of chemical bonding, the electrons involved are the ones located in the outermost shell of an atom, called the valence electrons. An atom's chemical behavior and its propensity to form bonds are determined by its valence electrons. There are two main types of chemical bonds: ionic bonds and covalent bonds.
In ionic bonding, electrons are transferred from one atom (turning it into a positively charged ion, or cation) to another (turning it into a negatively charged ion, or anion). This results in an electrostatic attraction between the ions, forming an ionic bond.
Covalent bonding, on the other hand, involves the sharing of valence electrons between atoms. This can result in single, double, or triple bonds based on how many electron pairs are shared: two electrons for a single bond, four for a double bond, and six for a triple bond.
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what ion does a base give up
Answer:
Hydroxide ion (OH-)
Explanation:
Most bases give up hydroxide ions whereas acids give up hydronium ions (H3O+).
True or false....
A tornado is a funnel cloud that has touched the ground.
Answer:
True
Explanation:
A tornado is a funnel cloud that has touched the ground.
When a funnel cloud reaches the ground it is called a tornado.
A funnel cloud is a rotating cone-shaped column of air extending downward from the base of a thunderstorm.
Which best describes a chain reaction associated with a nuclear reaction?
neutrons released during a fission reaction cause other nuclei to split. If this is an option
Answer:
A, Neutrons released during a fusion reaction cause other nuclei to fuse.
Explanation:
The neutron released in the nuclear reaction collides with other nuclei, and so on and so forth.
What is the systematic name of of Na2O
Answer: sodium oxide
Explanation:
Answer:
sodium oxide
Explanation:
1531 mL of a gas is collected at 9.4 mm Hg. What will the volume be at standard pressure? Standard pressure is 760 mm Hg.
Answer:
18.94 mL.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and T are constant, and have two different values of V and P:
P₁V₁ = P₂V₂
P₁ = 9.4 mm Hg, V₁ = 1531.0 mL.
P₂ = 760.0 mm Hg, V₂ = ??? mL.
∴ V₂ = P₁V₁/P₂ = (9.4 mm Hg)(1531.0 mL)/(760.0 mm Hg) = 18.94 mL.
The water cycle, photosynthesis, nutrient cycling, and soil formation are examples of:
A.) regulating services.
B.) provisioning services.
C.) cultural services.
D.) supporting services.
It seems like the answer would be supporting services.
The water cycle, photosynthesis, nutrient cycling, and soil formation are examples of supporting services in the ecosystem.
Explanation:The water cycle, photosynthesis, nutrient cycling, and soil formation are examples of supporting services. These services are a part of ecological or ecosystem services, which are categorized into four types: regulating services, provisioning services, cultural services, and supporting services. The supporting services are those essential ecological processes that are necessary for the existence and maintenance of other ecosystem services.
In the examples you provided, the water cycle supports the transport and availability of water for life, photosynthesis supports the production of oxygen and food for organisms, nutrient cycling supports the recycling of essential nutrients, and soil formation supports the growth of plants and the retention of water and nutrients.
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Electronegativity difference of N and H
Nitrogen has an electronegativity of 3.0 whereas hydrogen is 2.1 based on the Pauling scale. Therefore nitrogen is very electronegative and more electronegative than hydrogen
Electronegativity difference of N and H is 0.9
Covalent
What do acids feel like
Answer:
In fact, some strong bases can burn the skin as badly as strong acids. Bases feel soapy or slippery because they react with acidic molecules in your skin called fatty acids. ... Like acids, bases change the colors of acid-base indicators, but the colors they produce are different. Bases turn litmus paper blue.
Acids are substances that release hydrogen ions in solution. Strong acids like Hydrochloric acid can cause a burning sensation when interacting with sensitive tissues while weak acids are generally safer to handle. Antacids are used to neutralize excess stomach acid and alleviate discomfort.
Explanation:Acids are substances that release hydrogen ions (H*) in solution, having a high tendency to participate in chemical reactions. The feeling experienced when we come into contact with acids can highly depend on their strength and concentration. For instance, strong acids like Hydrochloric acid (HCl), found in stomach, aid digestion and kill ingested microbes but they can also cause a burning sensation when they leak into the esophagus, resulting in heartburn. As for weak acids like vinegar or acetic acid, they do not ionize completely and are generally safer to handle.
Antacids, which are bases like calcium carbonate (CaCO3) or magnesium hydroxide (Mg(OH)2), are typically taken to neutralize excess stomach acid when experiencing heartburn, thus reducing the uncomfortable burning sensation.
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Which of the following is NOT an Jovian planet?
A. Earth
B. Saturn
C. Neptune
D. Uranus
Answer:
Earth
Explanation:
A Jovian Planet is a gas giant, the term is derived from Jupiter which describes the three other gas giants in the Solar System as Jupiter-like. So Jupiter, Saturn, Uranus and Neptune are the only considered Jovian Planets.
The term Jovian planets refers to the gas or ice giants in our Solar System, including Jupiter, Saturn, Uranus, and Neptune. Therefore, Earth, which is a terrestrial planet, is not a Jovian planet.
The term Jovian planets typically refers to the giant outer planets in our Solar System, which include Jupiter, Saturn, Uranus, and Neptune. These planets are often called the gas giants or ice giants because of their large sizes and gas or ice-rich compositions. From the given options; Saturn, Neptune, and Uranus are part of the four Jovian planets. Therefore, Earth is not a Jovian planet. Instead, Earth is considered a terrestrial planet, which means it's primarily composed of rock and metal and has a solid surface.
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What is the scientific term for something that is living and demonstrates the 7 life processes?
A. Thing
B. Ecology
C. Organism
D. Bacterium
Answer:
b
Explanation:
trust me
a _____ is the location of an object.
Answer:
Coordinate
Explanation:
It comes in a set of values (x,y) in two dimensions or (x,y,z) in three dimensions. Coordinates are useful in many applications such as tracking planes in the air and also in the military in precision strikes. GPS also used coordinates to describe the location of a particular feature.
In physics, position refers to the location of an object, described relative to a frame of reference. Displacement is the change in position and includes both the straight line distance and the direction of motion. Understanding these concepts is key to studying the motion of objects.
Explanation:Position
To describe the motion of an object, you must first be able to describe its position (x): where it is at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, or other reference frames in motion relative to Earth. The displacement of an object is the change in its position, which includes the straight line distance and the direction of its motion between initial and final positions.
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9. How many grams of potassium sulfate are needed to make 250 mL of a 0.150 M
potassium sulfate solution?
Answer:
6.53g of K₂SO₄
Explanation:
Formula of the compound is K₂SO₄
Given parameters:
Volume of K₂SO₄ = 250mL = 250 x 10⁻³L
= 0.25L
Concentration of K₂SO₄ = 0.15M or 0. 15mol/L
Unknown:
Mass of K₂SO₄ =?
Methods:
We use the mole concept to solve this kind of problem.
>>First, we find the number of moles using the expression below:
Number of moles= concentration x volume
Solving for number of moles:
Number of moles = 0.25 x 01.5
= 0.0375mole
>>Secondly, we use the number of moles to find the mass of K₂SO₄ needed. This can be obtained using the expression below:
Mass(g) = number of moles x molar mass
Solving:
To find the molar mass of K₂SO₄, we must know the atomic mass of each element in the compound. This can be obtained using the periodic table.
For:
K = 39g
S = 32g
O = 16g
Molar mass of K₂SO₄ = (39x2) + 32 + (16x4)
= 78 +32 + 64
= 174g/mol
Using the expression:
Mass(g) = number of moles x molar mass
Mass of K₂SO₄ = 0.0375 x 174 = 6.53g
Answer:
6.97 g
Explanation:
cK-12
16.9 Molarity
Which statement best describes the basis of the band theory of metallic bonding?
Answer:
C
Explanation:
Atomic orbitals overlap to form molecular orbitals in which the valence electrons in the atoms travel
What is the difference between a liquid and a gas
Answer:
The molecules of the gas has more kinetic energy and has a lot of space between them. The molecules in the liquid moves slower than gas and has a tighter space than gas. Another difference is liquid takes up the shape of its container while gas does not. Cause its air.