Chemical equations are symbolic depictions of chemical reactions where the reactants and products are stated in terms of their respective chemical formulae.
The correct answer is B. Put a "2" in front of the KOH.
What is the chemical equation for potassium oxide + water ---> potassium hydroxide?K2O + H2O → KOH
Water and potassium oxide combine to form potassium hydroxide.Ionic compounds include potassium oxide. While oxygen has an O2− charge, potassium has a K + charge. The formula K 2 O is created by adding two potassium ions to balance out one oxide ion.An ionic compound is potassium hydroxide. Hydroxide has a charge of OH and potassium has a charge of K +. The formula KOH is created by adding one potassium ion to one hydroxide ion.K2O + H2O → KOH
We add a coefficient of 2 in front of the potassium hydroxide to make the equation equal.K2O + H2O → 2KOH.
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round 100.1 C to 1 significant figure
what might happen if the earth exceeds its carrying capacity
Exceeding the Earth's carrying capacity can have negative consequences, such as a population crash and collapse of ecosystems.
Explanation:When the Earth exceeds its carrying capacity, it means that the resources available are being used up faster than they can replenish. This can lead to several negative consequences. For example, if the human population continues to increase, the birth and death rates could decrease, causing a population crash. Additionally, the ecological footprint of humans would increase beyond the Earth's ability to support it, potentially leading to a collapse in the population.
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How might a chemical spill affect nutrient cycles in soil
A chemical spill can disrupt nutrient cycles by causing nutrient overload in soils, leading to eutrophication in nearby water bodies, which depletes oxygen and harms aquatic life. The use of artificial fertilizers contributes to this issue, upsetting delicate ecosystem balances and creating long-term ecological consequences.
Explanation:A chemical spill can significantly affect nutrient cycles in soil, with various negative environmental impacts. Chemicals such as those from fertilizers lead to increased levels of nitrogen and phosphorus, which can cause eutrophication in water bodies. Eutrophication is characterized by excessive algae growth that depletes oxygen, affecting aquatic life and disrupting the balance of ecosystems. Moreover, a chemical spill may also increase soil acidity or alkalinity, altering the soil's ability to hold and cycle nutrients like nitrogen, phosphorus, and sulfur, which are vital for plant growth. In some cases, chemicals may leach nutrients away from soil, diminishing the soil's fertility and impacting plant life.
Human activities including the use of artificial fertilizers exacerbate these effects. Runoff from these fertilizers adds to the nutrient load in water bodies, triggering algal blooms, causing oxygen depletion, and creating dead zones where aquatic life cannot survive. The aftermath of such spills affects not only plants but also the animals that depend on those plants, thereby altering the entire ecosystem.
Nutrient pollution due to overuse of fertilizers in agriculture and residential settings significantly upsets aquatic ecosystems. The runoff contributes to the accumulation of harmful toxins which can affect human health and lead to extensive ecological damage that may take decades to reverse.
A chemical spill can disrupt nutrient cycles in soil by causing excess nutrients like phosphorus to leach away and by promoting eutrophication due to nitrogen-rich compounds. This imbalance can degrade soil health, harm aquatic ecosystems, and contribute to broader environmental issues such as global warming and acid rain.
Explanation:A chemical spill can greatly affect the nutrient cycles in soil. These cycles are integral to maintaining the balance of elements like nitrogen and phosphorus. A spill can lead to an excess of certain nutrients, which may alter soil chemistry. For example, a chemical spill containing phosphorus can increase its chemical mobility, making it prone to leaching and resulting in a decline in stored nutrients vital for plant growth. On the other hand, nitrogen-rich compounds from artificial fertilizers, if spilled, can cause excessive eutrophication, creating algae overgrowth and depleting oxygen in nearby water bodies, thus jeopardizing aquatic life. Additionally, altered nitrogen cycles due to human activity such as fossil fuels combustion and the use of artificial fertilizers contribute to various ecological disturbances, including global warming and acid rain. Ongoing eutrophication can have serious long-term consequences, such as dead zones in oceans and can disrupt the natural nitrogen fixation process essential for plant and soil health.
a sedimentary rock that shows ripple marks have been found. what did the ripple marks tell us about the rock formed
Answer:
the answer on your test will be.
The rock formed in a fast-moving stream.
Consider the free body diagram of a block on a table. What is the name of the force for "table pushes up?
A)
normal force
B)
tension force
C)
static friction
D)
resistance force
Which of the following statements is true?
A. Dalton believed atoms were made mostly of empty space
B. Plasmas have a net negative charge
C. The number of protons in an element is always equal to the number of neutrons
D. Solids have a fixed mass, volume, and shape
Answer:
D. Solids have a fixed mass, volume, and shape
Explanation:
solid have fixed volume, mass and shape due to this they are closely packed.
The molecules in the solid stay in fixed points and they are tight together.
Dalton explained that all the elements are made up of atoms.
Plasmas contain both positive ions and negative charges in equal quantity.
The number of protons in an element is always equal to the number of electrons.
Thus option(D) Solids have a fixed mass, volume, and shape is the correct answer.
What is a sedimentary rock formed from the remains of tiny sea animals.
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when you use a crowbar to lift a large rock, you are working against the force called
Two wagons are pulled with equal force. Wagon A is empty . Wagon B is carrying enough bricks to double the mass of the wagon. how do their accelerations compare?
A . Wagon B will accelerate at twice the rate of wagon A.
B . Both wagons will accelerate at the same rate since their forces are the same.
C . Wagon A will accelerate at half the rate of wagon B.
D . Wagon A will accelerate at twice the rate of wagon B.
What is the main function of the circulatory system in multicellular organisms? A. to bring oxygen into the lung B. to put carbon dioxide into all blood vessels C. to expel waste products from the body D. to transport materials throughout the body
"Two-thirty in the afternoon" is a measure of:
relative time
absolute time
The answer is absolute time.
What is the effect of acid rain on the infrastructure of buildings and bridges ?
When a transition metal reacts with chlorine, what types of bonds are formed between the two elements? A) ionic bonds B) covalent bonds C) transition bonds D) No bonds are formed.
Answer : The correct option is, (A) ionic bonds
Explanation:
Ionic bond : It is defined as the bond that is formed by complete transfer of electrons from one atom to another atom.
That means, the atom which looses the electron is known as electropositive atom and the atom which gains the electron is known as electronegative atom.
The ionic bond is usually formed between a metal and a non-metal.
Covalent bond : It is defined as the bond which is formed when sharing of electrons takes place between the atoms.
This is usually formed between two non-metals.
When a transition metal reacts with chlorine then they form ionic bond because transitions metals are metal and chlorine is a non-metal. So, transition metal and chlorine will form an ionic bond.
Hence, the correct option is, (A) ionic bonds
What is made up of usable amounts of metallic elements
The choices are:
Carbonate
ore
silicate
a mineral
The correct option is:
ore
Explanation:
An ore is an experience of rock or sediment that comprises sufficient minerals with economically valuable elements, typically metals, that can be economically derived from the deposit. The ores are obtained from the earth through mining; they are then polished (often via smelting) to extract the important element or elements.A metal is a material (an element, compound, or alloy) that is typically hard, opaque, shiny, and has good electrical and thermal conductivity.
Answer:
ore
Explanation:
cuz
QUESTION 4
Where is desertification NOT likely to occur?
the east coast of America
California
North Africa
Central Asia
Greg modeled the water cycle for a science project. He added water to a large pot. Then he placed a sheet of glass on top of the pot. He heated the pot until the water changed to water vapor. The picture below shows what Greg observed.
Which process caused the water vapor to form liquid water droplets where the drawing shows them?
A. condensation
B. evaporation
C. freezing
D. precipitation
How can you use the periodic table to find the number of neutrons in one atom of an element?
The number of neutrons is equal to the number of electrons.
The number of neutrons is equal to the atomic number of the element.
The number of neutrons is equal to the atomic weight of the element.
The number of neutrons is equal to the atomic weight minus the number of protons.
To find the number of neutrons in an atom of an element using the periodic table, subtract the atomic number from the atomic weight.
Explanation:To find the number of neutrons in an atom of an element using the periodic table, you need to look at the element's atomic number and atomic weight. The atomic number represents the number of protons in the nucleus of an atom. The atomic weight represents the average mass of all the isotopes of an element, taking into account the abundance of each isotope.
To find the number of neutrons, you subtract the atomic number from the atomic weight. This is because the atomic weight includes both protons and neutrons, so subtracting the atomic number (which represents the number of protons) gives you the number of neutrons. For example, for helium (atomic number 2, atomic weight 4.0026), there are 2 neutrons (4.0026 - 2 = 2).
Therefore, the correct option is: The number of neutrons is equal to the atomic weight minus the number of protons.
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how do you find the number of protons in an atom?
What happens to liquid when it releases enough energy
When a liquid loses sufficient energy, it changes its state from liquid to solid, a process called freezing. The particles in the liquid slow down and form fixed positions, becoming a solid. The temperature remains constant during this phase change until the entire substance has transformed.
Explanation:When a liquid releases enough energy, it undergoes a phase transition or change of state from liquid to solid, typically known as freezing. This process occurs as the particles in the liquid lose energy and slow down, enabling them to form fixed positions and turn into a solid substance. This is quite evident in water; when it cools sufficiently and loses enough thermal energy, it becomes ice.
In phase transitions, it's important to note that the temperature of a substance remains constant until the phase change is complete. For instance, the temperature of water stays at 0 degrees Celsius (32 degrees Fahrenheit) when freezing, despite losing energy, until all the water has turned into ice.
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List in order from smallest to largest the grain sizes used to describe detrital sedimentary rocks.
Answer:
The grains from smallest to the largest are as follows-
(1) Clay (Diameter, D< 0.004 mm in diameter)
(2) Silt (D= 0.004 to 0.0625 mm)
(3) Sand (D= 0.0625-2 mm)
(4) Gravel (D= 2-4 mm)
(5) Pebble (D= 4-256 mm)
(6) Cobble (D= 64-256 mm)
(7) Boulder (D> 256 mm)
These sediments are weathered from the source rock and are transported from the source area to a different place and then they are compacted and lithified as a result of which detrital (clastic) sedimentary rocks are formed. For example, sandstone, siltstone, sandstone, conglomerate and breccia.
for a given input force, a ramp increases which of the following? A)height B)output force C)output work D) efficiency
does the depth of a pan affect how water freezes
Whatis the SI unit used by chemists to measure the amount of an element or substance
Answer:
mole
Explanation:
just cause
A basketball has a mass of 1 kg and is traveling 12 m/s. How fast would a 6 kg bowling ball have to travel to have the same momentum
Answer:
The velocity of the bowling should be 2 m/s in order to an have same momentum as that of basket ball.
Explanation:
Momentum is defined as motion possessed by the moving object.it is calculated by multiplying mass of the object with its velocity.
[tex]Momentum(P)=mass(m)\times Velocity(v)[/tex]
Mass of basket ball = m = 1 kg
Velocity of the basket ball,v = 12 m/s
Momentum of the basket ball = p
p = 1 kg × 12 m/s = 12 kg m/s
Mass of bowling ball = m' = 6 kg
Velocity of the bowling ball = v'
Momentum of the bowling ball = Momentum of the basket ball = p
p = m' × v'
12 kg m/s = 6 kg × v'
v ' = [tex]\frac{12kg m/s}{6 kg}= 2 m/s[/tex]
The velocity of the bowling should be 2 m/s in order to an have same momentum as that of basket ball.
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Which baseball bat will hit the ball the longest distance? Students in Mr. Brant's class designed an experiment to test this research question. The table shows the trial data they collected for the different bats. Which bat, based on this data, would be the best choice if you were interested in using low force to move the ball?
A. wood
B. alloy
C. aluminum
D. alloy or aluminum
The answer is: B. alloy.
The best choise in using low force (100 N, 200 N, 300 N) to move the ball is alloy, because it has the greatest distance (25 m, 30 m, 80 m).
One newton is the force needed to accelerate one kilogram of mass (in this example bat) at the rate of one metre per second squared in direction of the applied force.
Newton's second law of motion: F = m · a.
F - force applied.
m - mass of the object receiving the force.
a - the acceleration of the object.
In the following diagram, the voltage is 1.5 volts and the resistance is 7.5 ohms. Use Ohm's law to determine the current in the circuit.
Answer: The current flowing through the circuit is 0.2 Amperes.
Explanation:
Ohm's Law is defined as the law which determines the relationship between current and potential difference across a resistor.
Mathematically,
[tex]V=IR[/tex]
where,
V = Potential difference across the resistor = 1.5 V
I = Current flowing through the circuit = ? A
R = Resistor in the circuit = [tex]7.5\Omega[/tex]
Putting values in above equation, we get:
[tex]1.5=I\times 7.5\\\\I=0.2A[/tex]
Hence, the current flowing through the circuit is 0.2 Amperes.
what does ice cream melt on a hot day which type of thermal energy transfer does this melting represents
The reason ice cream melt on a hot day and the type of thermal energy transfer is "the absorbent of heat around it and exothermic thermal energy.
The thermal energy responsible for ice cream melting.Exothermic thermal energy is the type of thermal energy that makes an ice cream melt on a hot day.
Ice cream melts because it absorbs the energy around it in the form of heat or thermal energy. This extra energy causes the atoms to vibrate, turning the solid into a liquid. The exact melting point of ice cream depends on what is added to the ice cream base.
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Andrea is interested in medical science and wants to be a doctor. Her grades in science are impressive. Which CTSO should she join to help her move closer to her ambition?
Answer: Health Occupations Students Of America
Explanation:
What is vaporization A: a gas becoming a liquid B: a liquid becoming a solid C: a gas becoming a solid D: a liquid becoming a gas
D. A liquid becoming gas