Which of these equations is balanced? a. H2SO4 + 2Al → Al2(SO4)3 + H2 b. 2KCl + Pb(NO3)2 → 2KNO3 + PbCl2
how much does a 45% solution of de-icing fluid lower freezing point of water?
Answer:
It lowers the freezing point by 30 °C
Explanation:
In the picture attached, the curve freezing point vs de-icing fluid concentration is shown. We can see that a 45% solution of de-icing fluid makes the freezing point of water -30 °C, that is, 30 °C below the pure water freezing point.
The chemical combination of two or more substances which can ONLY be separated by chemical means is called a(n) ________________. A) Element B) Orbit C) Mixture
_____ helps to destroy animals and plants when they die, preventing them from fossilizing.
Answer:
Decomposers
Explanation:
Decomposers are defined as those organisms that decomposes the organic components of the dead organisms. For example, microbes and saprophytes.
When plants and animals dies, the decomposers eats up the organic substance. These consumption of organic substances helps in the growth and expansion of the microbes.
The decomposers does not allow the organisms to undergo fossilization process. It prevents them from turning into a fossil. The organism completely decays if there is no hard parts present in it.
what causes element name to change
The name of an element changes when its atomic number changes. This can occur naturally through radioactive decay or artificially through a process known as transmutation, where changes are made in the number of protons in an atom's nucleus.
Explanation:The name of an element changes when its atomic number changes. This happens either through natural radioactive decay processes or through artificial transmutation involving changes in the number of protons in an atom's nucleus. For example, Uranium-238, over time, naturally decays to Lead-206, signifying a change in the atomic number, hence a change in element name.
Similarly, in Accelerators or nuclear reactors, high-energy particles can be used to convert some elements into others. For instance, the bombardment of nitrogen atoms by alpha particles in a nuclear reaction can transform it into Carbon.
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QUESTION OF THE DAY!
A student found a spider, tick, fly, and a bee in his backyard. After studying their bodies and doing some research, he concluded that their _____ performs the major life functions.
Wings
Legs
Eyes
Cells
QUESTION 2
What agent causes sand dunes to form?
ocean waves
weathering of old rocks in the desert
the wind carries the sand until it runs into an obstacle
gravity
The answer to your question would be:: the wind because it carries the sand until it runs into an obstacle
Sand dunes: These are small hills made up of lose sand.
During formation of dunes ( in deserts or sea shores) there is creeping of sand particles along one side and there is sliding of sand on other side resulting in formation of a dune.
Thus the agent causes sand dunes to form is the wind carries the sand until it runs into an obstacle
Why don't we notice changes in the elevation of the land due to the moons pull?
What is the acceleration of a 100 kg canoe that feels a force of 1000n?
The acceleration of a 100 kg canoe with a force of 1000 N applied to it is 10 m/s²,
calculated using the formula a = F / m.
The acceleration of a 100 kg canoe that feels a force of 1000 N can be calculated using Newton's second law of motion, which states that acceleration is equal to the net force divided by the mass of the object. Hence, the acceleration a is given by the formula:
a = F / m
Where F is the force exerted on the canoe and m is the mass of the canoe. Substituting the given values:
a = 1000 N / 100 kg = 10 m/s²
Therefore, the acceleration of the canoe is 10 meters per second squared (m/s²).
New cells are created from A) matter. B) energy. C) other cells. D) non-living matter.
Answer: C) other cells.
Explanation: I took the Pre-Test on USA Test Prep.
A white solid can be purified from lemon juice. This solid tastes sour. When placed into water the solution conducts electricity and has a pH of 3.0. The solution turns litmus paper red. When the white powder is reacted with sodium hydroxide, a different white powder is formed which tastes salty. What kind of substance is the original white powder isolated from lemon juice?
Explanation:
When a solution is acidic in nature then it means its pH range is from 1 to 6.9. And, in an acidic solution there are more number of hydrogen ([tex]H^{+}[/tex]) or hydronium ([tex]H_{3}O^{+}[/tex]) ions as compared to hydroxide ions ([tex]OH^{-}[/tex]).
Some properties of acids are as follows.
Acids taste sour.Acids show a pH value less that 7.Acids release hydrogen ion upon dissociation in water of polar solvents.Acids turn blue litmus into red.Now, since the white solid substance isolated from lemon juice shows all the properties of being an acid.
Thus, we can conclude that the original white powder isolated from lemon juice is an acidic substance.
The white solid isolated from lemon juice is citric acid.
It has a sour taste, an acidic pH, and turns litmus paper red.
When reacted with sodium hydroxide, it forms sodium citrate, which tastes salty.The white solid isolated from lemon juice is citric acid.Here's how we can identify it:
Acidic Properties: Citric acid is known for its sour taste and acidity. The description mentions that the solid tastes sour and creates a solution with a pH of 3.0, which is characteristic of an acid.Conductivity: When dissolved in water, the solution conducts electricity, indicating the presence of ions, a common property of acids.LLitmus Test: The solution turns litmus paper red, confirming its acidic nature.Reaction with Sodium Hydroxide: When the citric acid reacts with sodium hydroxide (a base), it forms a different white powder, in this case, sodium citrate, which is salty to taste.Summary
Considering all the characteristics described, the original white solid is citric acid, a common component of lemon juice.what occurs when gas molecules escape from the surface of a open container of liquid?
When gas molecules escape from the surface of an open container of liquid, the process is called evaporation. This involves molecules gaining enough energy to leave the liquid phase and enter the gas phase.
This occurs because some molecules in the liquid acquire enough energy to overcome the attractive forces holding them in the liquid phase. These energetic molecules then move into the gas phase, where they disperse and fill the available space in the container.
If the container were sealed, a dynamic equilibrium between evaporation and condensation would be established. During this equilibrium, the rate of molecules escaping (evaporating) would equal the rate of molecules returning to the liquid phase (condensing).
Steps involved in evaporation:
Individual molecules in the liquid gain sufficient energy from heat.These molecules overcome intermolecular forces.The molecules escape from the liquid surface and become part of the gas phase.This constant movement between phases ensures that at equilibrium, the number of gas-phase molecules remains constant if temperature remains unchanged.
Which type of cell is a rose thorn? prokaryotic eukaryotic plant eukaryotic animal chloroplastic
Rose thorn is a eukaryotic plant cell. It is a type of eukaryotic cell.
What is eukaryotic cell?Eukaryotic cell is defined as the cells with a well-organized nucleus and organelles surrounded by membrane-bound organelles.
The major difference between plant cell and animal cell is that one cell has lysosome present in it while other does not have lysosomes.
It can also be defined as the cell that contain the nucleus, mitochondria, and endoplasmic reticulum are all membrane-bound organelles.
There are various cell present in the eukaryotic cells sech as
MitochondriaEndoplasmic reticulumNucleusCytoplasm Golgi bodiesRibosomes etc. and many more are present.Thus rose thorn is a eukaryotic plant cell. It is a type of eukaryotic cell.
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The correct answer is eukaryotic plant.
A rose thorn is a part of a rose plant, and like all plant cells, it is classified as a eukaryotic cell. Eukaryotic cells are characterized by the presence of a true nucleus and other membrane-bound organelles. Additionally, plant cells contain chloroplasts, which are the sites of photosynthesis, and a rigid cell wall that provides structure and support to the plant. Since a rose thorn is part of the plant's defense mechanism and not an animal cell, the correct classification is eukaryotic plant cell. Chloroplastic is not a cell type but rather refers to the presence of chloroplasts within plant cells.
QUESTION 3
What are the results of desertification?
loss of farmland
populations will increasingly immigrate to deserts
sand increases the destruction of predators
increase in vegetatation
The result would be: loss of farmland
Answer:
Loss Of Farmland :P
Explanation:
In comparison to the rock it intrudes, what is the relative age of a dike?
always older than the rock it intrudes
always younger than the rock it intrudes
always older than the very top layer
always older than the last layer it intrudes
Always younger then the rock it intrudes is the right answer)
If a solution is saturated, which of these is true?
More solute can be dissolved.
The concentration cannot be increased.
No more solvent can be dissolved.
More solvent can be dissolved.
Which soil layer is the least similar to the underlying rock
When a river overflows its banks, it deposits sediment over a broad, flat area of land on both sides of the river. This broad flat area is called a _______.
A broad, flat area of land on both sides of a river, where sediments are deposited when it overflow its banks is called a floodplain.
What is a river?A river can be defined as a large natural body of fresh water that flows continuously into an ocean, lake, sea or another river. Some examples of a river include the following:
River NileMississippiSaint LawrenceDanubeAmazon What is a floodplain?A floodplain simply means a broad, flat area of land on both sides of a river, where sediments are deposited when it overflow its banks. Thus, a floodplain is an area of broad, flat land near a river that is usually flooded when the river overflow its banks or becomes too full.
In conclusion, old rivers are typically characterized by floodplains.
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The velocity of a car goes from 0 m/s to 60 m/s in a forward direction. What is the best explanation for this change?
When the speed was 0 m/s, the forces acting on the car were unbalanced. When the forces became balanced, the car started to move.
When the velocity was 0 m/s, all the forces acting on the car were balanced. The velocity changed because at least one unbalanced force is acting on the car.
When the inertia was constant, the speed was 0 m/s. The speed changed because the inertia of the car increased.
The force of gravity on all sides was equal at 0 m/s. The velocity of the car increased because the force of gravity on the back of the car increased.
The answer is B
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PLEASE HELP!
Which nonmetals have similar chemical properties? Check all that apply.
sulfur
nitrogen
selenium
oxygen
carbon
fluorine
It is sulfur, selenium, oxygen
Sulfur, selenium, oxygen
Explanation;Sulfur, selenium, and oxygen are non-metals that have similar chemical properties. They belong to a group called the oxygen family. Oxygen family is composed of elements oxygen, sulfur, tellurium, selenium and polonium. Each element in this family has six valence electrons in the outermost energy level. They therefore require two electrons to acquire a stable configuration or octet configuration. Thus, they have a valency of two.which step happens before mitosis? a. anaphase b. telophase c. interphase d. metaphase
an electric clock in a classroom will not run if it not plugged into an electric outlet what does the clock get from the electric current from the outlet?
A) batteries
B)chemicals
C) energy
D)time of day
24 POINTS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Which graph BEST represents the relationship between mass and inertia?
A
B
C
D
Answer: The correct answer is Graph B.
Explanation:
Inertia is the property of a matter due to its mass. Due to inertia, a body resits any change in its state of rest or motion. Newton's first law is based on inertia and is also known as Law of inertia.
This law states that any body will remain at rest or in motion until and unless an external force is applied on it.
Inertia is directly related to the mass of a substance. As, the mass is more, its inertia will be more and vice-versa.
The graph will represents the direct relation is Graph B. As, the mass is increasing, the inertia is also increasing
Hence, the correct answer is Graph B.
A rock that is made of coarse-grained particles arranged into bands is found. What type of rock is it?
Answer:
igneous rock
a vehicle of known mass accelerates along a straight path. according to newtons second law of motion, what caused this acceleration?
An unbalanced force has acted on the vehicle.
What three factors set convection currents in motion?
Convection currents are driven by temperature differences, gravity, and the density changes that heat induces in fluids, causing a cycle of rising warm fluid and sinking cool fluid.
Explanation:The three factors that set convection currents in motion are temperature differences, gravity, and the density variations that occur as a result of heating and cooling within a fluid (which can be either a liquid or a gas). In natural convection, warmer parts of a fluid, which are less dense, rise due to buoyant forces, whereas cooler, denser parts sink. This movement can result in the transfer of heat. An example of this is seen in the circulation of air in Earth's atmosphere, where warm air from the equator rises and moves toward the poles while cooler air sinks and moves toward the equator. This entire process is driven by the temperature differences between different parts of the fluid and the action of gravity which acts on the differences in density that temperature changes create.
James Hutton:
developed the concept of plate tectonics
based his theories on the Neptunist view of crust formation
developed the theories of erosion and deposition
was the founder of the Plutonist theory of crust formation
Answer:
C. developed the theories of erosion and deposition
Explanation:
Hutton was a scottish geologist who believed that the origin of the earth was linked to molten magma and igneous rocks. His theory included the processes of erosion and deposition.
Therefore, the correct answer is C. developed the theories of erosion and deposition.
Name the physical properties that many ionic compounds share.
24 POINTS AND 5 STARS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Consider the free body diagram. It is a graphic representation of Mike exerting a force on a refrigerator. Four balanced forces are acting on the refrigerator in this case, No matter how hard Mike pushes, he cannot move the refrigerator. Mike asks Bill to help him. Both men push with 2N of force.
If Mike and Bill both push on the refrigerator, all BUT ONE statement would be true.
A. If both men push, they each use about half as much force.
B. Mike is still using the same amount of force he originally used.
C. The force is most likely doubled, while the mass remains the same.
D. Combined, about twice as much force is exerted on the refrigerator.
Answer : A) If both men push, they each use about half as much force.
Explanation : If both men push, they each use about half as much force. Mike needs Bill to increase the force on the refrigerator. Two men equals two times the force. The force of each is not reduced.
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how can you make a solution saturated