Answer:
1) A chemical reaction is shown.
SnO2 + H2 → Sn + H2O
What is true about this chemical reaction?
B.
It is unbalanced because the mass of the reactants (number of atoms) is greater than the mass of the products (number of atoms).
2) Read the information about an experiment.
Jadon plans on carrying out an experiment involving the burning of steel wool to illustrate the conservation of mass. Steel wool is made of iron. When it is burned it combines with oxygen to form iron(III) oxide.
Which step in his experiment is the most important if he wants his experiment to correctly demonstrate the conservation of mass?
A.
The steel wool should be burned inside of a sealed jar or other closed system.
Explanation:
The explanation to number 1 is that I selected it in my test and got it.
The explanation the number 2 is from the link below:
https://quizizz.com/admin/quiz/5dee60258f1145001bc02ed5/physical-science-2nd-9-weeks-practice-test-2020
The true statement about the given chemical reaction is-It is balanced because the mass of the reactants (number of atoms) is equal to the mass of the products (number of atoms). Therefore, the correct options for all the problems are 1-A, 2-A and 3-D.
What is a balanced equation?A balanced equation refers to an equation where the number of atoms of each element is the same on both sides of the equation. The given equation is balanced because the number of Sn atoms and the number of H atoms on the reactant side are equal to the number of Sn atoms and the number of H atoms on the product side.
1. The steel wool should be burned inside a sealed jar or other closed system is the most important step if he wants his experiment to correctly demonstrate the conservation of mass.
2. They didn't use enough HCl that no iron is left in its original state might be a reason that their demonstrations were not successful.
Therefore, the correct options are 1-A, 2-A and 3-D.
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When you flex your knee, where are the fulcrum and the load? Where is the muscle that provides the effort located?
Explanation:
the fulcrum is the knee joint
the load is probably the radius and ulna with the muscle on it
while the effort could be tendons and the muscle on the femur
A person with a bacterial infection begins to feel hot and feverish. This response MOST likely helps the body fight infection by —
Answer:
making it hard for bacteria to leave the body
Explanation:
Prior to Mendel, scientists thought that an offspring _____.
inherited traits from only one parent
blended the traits of both parents
demonstrated traits randomly
exhibited certain traits from each parent
Answer:
blended the traits of both parents
Explanation:
True or False: There are no shortcuts in
dichotomous keys!
Answer:
True
Explanation:
No need to skip
The image here shows potential outcomes for chromosomes at a particular stage of meiosis. Which questions appropriately assess what is happening in the image. Select ALL that apply.
A) How does crossing over increase the outcome of meiosis?
B) How does fertilization increase genetic diversity in a diploid organism?
C) How does independent assortment increase genetic diversity during meiosis?
D) How many potential combinations result from chromosomes alignment during metaphase I?
E) How does chromosome methylation result in silencing specific genes during gamete formation?
According to the random arrangement of homologous chromosomes in the equatorial plane, the correct question is D) How many potential combinations result from chromosomes alignment during metaphase I?
How does the random arrangement of tetrads occur?During metaphase 1, chromosomes' homologous pairs migrate to the equatorial plane. Once there, they randomly aline facing their kinetochores to the opposite poles.
The random arrangement of tetrads is different in every cell going through the meiosis process. This is because there is no equal alinement between two cells.
When tetrads arrange in the equatorial plane, there is no predetermined order. Each homologous chromosome of each tetrad faces any of the poles and then migrates to it while separating. Each of the chromosomes has two possibilities for orientation at the plane.
When the new haploid cells are formed, the number of variations in each cell is also different and depends on the chromosomes that form that cell.
This random order in the equatorial plane is what introduces variation into the gametes.
The correct question is D) How many potential combinations result from chromosomes alignment during metaphase I?
You can learn more about the random arrangement of homologous chromosomes at
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Answer:
C and D
Explanation:i just did the problem on USA test prep
Sedimentary rocks such as sandstone often contain cracks or ripples. These marks show that a number of sedimentary rocks form
A. In pockets of molten rock.
B. Inside ice in mountain ranges
C. Under sands in the desert
D. At the bottom of bodies of water
practice: density calculations
An igneous rock has a coarse texture and is dark in color. How else can this rock be accurately described?
small crystals
cooled quickly
produced from magma
formed at Earth’s surface
Answer:
C. produced from magma.
D. formed at Earth’s surface
Explanation:
Earth crust refers to the outermost layer or thin shell which makes up the earth such as sedimentary, metamorphic and igneous rocks.
The Earth crust is typically made up of two (2) main types;
1. Oceanic crust: this crust has a thickness ranging from 5 km to 10 km and comprises of denser rocks such as diabase, gabbro and basalt.
2. Continental crust: this crust has a thickness ranging from 30 km to 60 km and comprises of minerals such as quartz, silicate, feldspar, aluminum and less dense rocks such as granite
An igneous rock has a coarse texture and is dark in color. Also, an igneous rock can be accurately described as being produced from magma and formed at Earth’s surface.
Answer:
Produced from magma
Explanation:
I got it right on the test hope this helps
☺️
I NEED HELP ASAP PLEASE!!
Answer:
yes you're good. D its the right
Why don't you have mechanical energy
when
you are
laying on the ground?
Answer:
If an object is lying on the ground, and is nowhere near a "hole" or a cliff, then for the purposes of this system, the object would have a height of zero, therefore would have no gravitational potential energy. And therefore, no work could be performed on the object by gravity.
Explanation:
The kidneys and sweat glands both work to prevent excesses of
a) either uric acid or urine in the body.
b)either water or salt in the body.
c)either carbon dioxide or oxygen in the body.
d) either feces or pH levels in the body.
Answer: The kidneys and sweat glands both work to prevent excesses of either water or salt in the body
Explanation:
The kidneys and sweat glands both work to prevent excesses of either water or salt in the body. Thus, the correct option is B.
What is function of kidney and sweat glands?Both the kidneys and the sweat glands excrete nitrogenous wastes, water and electrolytes. They are also involved in maintaining acid-base balance.
kidney is the organelle present below the abdomen whereas the sweat gland is exocrine glands that release the substances into a duct or opening to the inside or outside of the body.
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Wrong answers only!! What are 3 sustainable tourism takes into account
Answer:
• robing
• playing h&s
• Hw
Explanation:
How did Burger King get Dairy Queen pregnant?
Answer:
they where like McDonald's they broke the icecream maker
At what light intensity do both sun plants and shade plants have the same rate of
photosynthesis?
Answer:
The rate of photosynthesis is at a maximum over a narrow range of light intensities.
Explanation:
Light provides the energy required to drive the process of photosynthesis. Starting from a low light intensity, the rate of photosynthesis increases as intensity increases. Hopefully helps ig
Dave is perched on a tree branch. Which factor determines his potential energy?
Answer:
Gravitational Potential Energy is determined by three factors: mass, gravity, and height. All three factors are directly proportional to energy.
Explanation:
Answer:
He is not moving so he is using potential energy
Explanation:
I hope this helps
The amount of energy at each trophic level in an ecosystem decreases as it moves through the ecosystem. Typically, only about 10 percent of the energy at one trophic level is transferred to the next level. The remaining energy is lost through metabolic processes as heat.
Suppose that, in the ecosystem modeled above, 150,000 kcal (kilocalories) of energy are contained within green plants. Assuming that the amount of energy transferred from one trophic level to the next is exactly 10 percent, determine the following amounts of energy in the ecosystem.
Answer:
Explanation:
Energy transferred to next trophic level=10%×150,000kcal
=10/100×150,000
=15,000kcal
The amount of the energy in the ecosystem should be considered as the 15,000kcal.
Calculation of the amount of energy:Since there is 150,000 kcal (kilocalories) of energy are contained within green plants.
And, 10 percent of the energy at one trophic level is transferred to the next level.
So here the amount of energy be like
= 10% of 150,000
= 15,000 kcal
Hence, The amount of the energy in the ecosystem should be considered as the 15,000kcal.
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How do trees help reduce carbon dioxide in the atmosphere?
Explanation:
Trees, like all plants, use the energy of sunlight to take carbon dioxide (CO2) from the air and water from the ground through the mechanism of photosynthesis. They release oxygen into the air during the process of turning it to wood.
and no- this is not copied :)
The maximum number of individuals that a population
can support and sustain is known as ?
A Carrying capacity
B Limiting Factor
C Migration
D Density
Answer:
the answer would be migration
PLEASE HELP ITS MY LAST QUESTION
Oxygen is a product of the electron transport chain.
True or False
Answer:
False :)
hope this helps m8
through which plant structure does water move by capillary action?
Answer:
Xylem
Explanation:
Which type of law is used to discipline members of the armed services?
Answer: D
Explanation: because they are in the military and that’s the only law I would recommend if someone needed discipline in the military
The diagram below shows a ciliated cell from the lining of the airway.
Which of the following states its function?Required to answer. Single choice.
(1 Point)
A)it is the place where diffusion of gases take place
B)it moves mucus and sweeps dust from lungs
C)it secretes trypsin
Pls tell meeee quickkk
Answer:
the answer is a. any ciliated cell in lungs catches bacteria & debris from lungs causing cough, difficulty breathing, etc.
can develop into asthma, infection of pleura, and bronchitis...
what does it mean to say that CO2 becomes "fixed" during photosynthesis
Answer:
What does it mean to say that CO2 becomes "fixed" in talking about photosynthesis?
A. CO2 becomes bonded to an organic compound.
Explanation:
What is one characteristic that a star’s spectrum can reveal?
A.
its direction
B.
its temperature
C.
when it was formed
D.
its constellation
Answer:
B. Temperature
Some argue that solar power should be the main energy source for the United States. Which argument could be used against this idea? A. It contributes to global warming. B. It can only be produced in sunny areas. C. It is a nonrenewable resource. D. It releases greenhouse gases.
Answer:
A. It contributes to global warming
Explanation:
Solar power is the power of the future and is an essential nonrenewable source of energy for man. Solar power is driven by the incoming solar energy in the form of solar rays. Solar power is eco-friendly and doe not cause any harm can be sued in the summer season and has ample scope for greenhouse gases. As per the statement, the solar power should be used as the main energy source in U.S can be contradicted by saying it contributes to global warming.How does gene regulation relate to organism complexity?
Answer:
Organisms that are more complex, such as eukaryotes, have cells that are specialized for specific functions. Gene regulation needs to be more complex to produce these specialized cells for complex organisms.
Hope this helps!
More complex organisms such as eukaryotes have cells that are specialized for specific functions where gene regulation needs to be more complex for complex organisms to produce these specialized cells.
What is Gene regulation?The process of turning genes on and off, defined as gene regulation which is an important part of normal development. For example, genes turn on and off in different patterns during development to make a brain cell look and function differently than a liver cell or a muscle cell.
Gene expression is controlled at two levels which is transcription which is controlled by limiting the amount of mRNA that can be produced from a particular gene and the second control is through post-transcriptional events which allow the translation of mRNA into protein.
Thus, more complex organisms such as eukaryotes have cells that are specialized for specific functions where gene regulation needs to be more complex for complex organisms to produce these specialized cells.
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The concept of induced fit refers to the fact that a. Substrate binding may induce a conformational change in the enzyme, which them brings catalytic groups into proper orientation. b. When enzymes bind substrates, the substrates are bought into proximity to make a chemical reaction favorable. c. When a substrate binds to an enzyme, the enzyme induces a loss of water from the substrate. d. When a substrate binds to an enzyme, free energy is released due to non-covalent interactions.
Answer:
Option A, Substrate binding may induce a conformational change in the enzyme, which them brings catalytic groups into proper orientation.
Explanation:
Induced fit concept refers to introduction of continuous change of enzyme conformation on substrate binding. This change in the shape of enzyme either inhibit or enhance the activity of enzyme. This makes the enzyme catalytic and hence lower the activation energy thereby increasing rate of reaction.
Earth’s rotation caused surface currents in the Northern Hemisphere to
A. Curve Clockwise
B. Move in straight lines
C. Curve Counterclockwise
D. Move in diagonal lines
Why do mutations code proteins?
Answer:
A nonsense mutation is a genetic mutation in a DNA sequence that results in a shorter, unfinished protein product. DNA is a chain of many smaller molecules called nucleotides. During protein formation, DNA (or RNA) nucleotide sequences are read three nucleotides at a time in units called codons, and each codon corresponds to a specific amino acid or stop signal (stop codon).
Explanation:
In order to assign a Richter magnitude to an earthquake event, a scientist would have to measure the _________ waves on a seismogram.
a. secondary
b. surface
c. primary
PLS ANSWER QUICK! I WILL GIVE POINTS, ITS JUST A YES OR NO QUESTION!
In two or more complete sentences, describe a scenario where human activities are related to an increase or decrease in biodiversity in an ecosystem.
I WAS THINKING OF WRITING ABOUT THE DEFORESTATION IN THE AMAZON, HOW THAT CAN KILL THE ANIMALS. OBV IF THE ANIMALS ARE DEAD THAT CAUSES A DECREASE IN BIODIVERSITY. IS THIS RIGHT?
Answer:
Yes?
Explanation: