Answer:
D and E
Explanation:
The others are physical methods and can be separated again.
Hope this helps :)
Ashes (which are made of carbon), carbon dioxide gas, water vapor, heat, and light are produced when wood is burned. Since this change cannot be undone, it is a chemical change. Since oxygen and hydrogen unite to create a single product, Thus option D and E is correct.
What is chemical changes?A chemical change is the transformation of one substance into another, the emergence of new compounds with distinct properties, or any combination of these.
It happens when two compounds mixes to create a new material (synthesis or either decomposes to form more substances).
Chemical synthesis, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance.
These processes are referred to as chemical reactions, and they are typically irreversible barring additional chemical reactions.
Therefore, burning of wooden logs and formation of water is an example of chemical changes.
Learn more about chemical changes here:
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The photo shows a single-celled organism.
Which sentence best describes what this organism will look like at the end of
its growth period?
A. The same single cell, but larger
B. Two cells, but half the size
C. A small ball of identical cells
D. Three individual cells in a row
Answer:
B. Two cells, but half the size
Explanation:
Single-celled organisms, which are also referred to as unicellular organisms, usually have a growth mechanism or process known as binary fission.
Binary fission is a an asexual reproduction process that involves the division of a mature parent cell into two identical daughter cells of equal sizes that are almost half of their parents cell.
The sentence that best describes how the single-celled organisms shown in the picture above will look like at the end of the growth period is: "b. Two cells, but half the size"
Answer:
B
Explanation:
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Each year, the United States' federal costs exceed the anticipated national budget. In fact the last time that the United States government was able to end a fiscal year without accruing more debt was in 1960. This means that due to excessive spending and compounding interest accrued, the United States' national debt has escalated astronomically over the past several decades. The table shown below lists the recorded U.S. national debt amounts, written in standard form, for each decade, from 1960 to the year 2010.
Year U.S. national debt (in U.S. dollars)
1960 $286,330,760,848.37
1970 $370,918,706,949.93
1980 $907,701,000,000.00
1990 $3,233,313,451,777.25
2000 $5,674,178,209,886.86
2010 $13,561,623,030,891.79
For each decade, convert the U.S. national debt amount to a number in scientific notation, rounded to the nearest hundred millions dollars. Enter in numerical answers only.
Year U.S. national debt (in U.S. dollars)
written in standard form U.S. national debt (in U.S. dollars)
written in scientific notation
1960 $286,330,760,848.37 $2.863 ∙ 10
1970 $370,918,706,949.93 $3.709 ∙ 10
1980 $907,701,000,000.00 $9.077 ∙ 10
1990 $3,233,313,451,777.25 $3.2333 ∙ 10
2000 $5,674,178,209,886.86 $5.6742 ∙ 10
2010 $13,561,623,030,891.79 $1.35616 ∙ 10
Answer:
Given the US National Debt,
1960 $286,330,760,848.37
1970 $370,918,706,949.93
1980 $907,701,000,000.00
1990 $3,233,313,451,777.25
2000 $5,674,178,209,886.86
2010 $13,561,623,030,891.79
Then, rounding off these numbers to nearest hundred million,
1960 $286,000,000,000.00
1970 $370,900,000,000.00
1980 $907,700,000,000.00
1990 $3,233,300,000,000.00
2000 $5,674,200,000,000.00
2010 $13,561,600,000,000.00
While representing a number in scientific notation, it is written as a number between 1 and 10 and then multiplied by a power of 10.
The debt amount becomes,
1960 $2.86×10¹¹
1970 $3.709×10¹¹
1980 $9.077×10¹¹
1990 $3.2333×10¹²
2000 $5.6742×10¹²
2010 $1.35616×10¹³
Explanation:
Given the US National Debt,
1960 $286,330,760,848.37
1970 $370,918,706,949.93
1980 $907,701,000,000.00
1990 $3,233,313,451,777.25
2000 $5,674,178,209,886.86
2010 $13,561,623,030,891.79
Then, rounding off these numbers to nearest hundred million,
1960 $286,000,000,000.00
1970 $370,900,000,000.00
1980 $907,700,000,000.00
1990 $3,233,300,000,000.00
2000 $5,674,200,000,000.00
2010 $13,561,600,000,000.00
While representing a number in scientific notation, it is written as a number between 1 and 10 and then multiplied by a power of 10.
The debt amount becomes,
1960 $2.86×10¹¹
1970 $3.709×10¹¹
1980 $9.077×10¹¹
1990 $3.2333×10¹²
2000 $5.6742×10¹²
2010 $1.35616×10¹³
Explanation:
Hurry plzzzz >_<
How are plant and animal cells similar?
Answer:
Plant and animal cells are similar because both are eukaryotic. Every plant and animal cell has a cell membrane and cytoplasm. In addition, nearly all plant and animal cells have a nucleus.
Explanation:
I got it right
Which of the following statements correctly describes the relationship between energy and nutrients in an ecosystem?
a. Energy and nutrients flow
b. Energy and nutrients cycle
c. Energy flows and nutrients cycle
d. Energy cycles and nutrients flow
PLZZZZZZ I NEED HELP ASAP I ONLY GOT A LIL TIME PLZZ HELP :)
Answer:
B. The first generation will not have short plants. The short trait will return in the second generation.
Explanation:
If T is for Tall and t is for short, then the first generation doesn't have any short offspring. We can rule out answer choices A and D.
The second generation results in TT, Tt, Tt, tt.
TT is a tall Offspring.
Tt is a Tall Offspring, with a small t as a recessive trait.
tt is a short offspring because both the recessive traits (t) are together.
We can rule out option C.
That leaves us with the correct answer being B. The first generation will not have short offspring, but will pass it on to the second generation, which will have a short offspring (25% chance of having short offspring).
Nuclear energy is currently used in which three kinds of vehicles?
O cars, submarines, spacecraft
O submarines, ships, spacecraft
O spacecraft, airplanes, cars
O airplanes, submarines, ships
Answer:
B: submarines, ships, spacecraft
Explanation:
Answer:
The answer is B - Submarines, ships, spacecrafts
Explanation:
I just took the Impact of Human Activity Unit Test. Person above me is correct
Feeding relationships within a community can be represented by
What do plant cells use to get energy from the sun
Answer:
Photosynthesis
Explanation:
Plant cells obtain energy through a process called photosynthesis. This process uses solar energy to convert carbon dioxide and water into energy in the form of carbohydrates.
Is toxic chemical pollution a nonpoint source pollution or a point source pollution? I need an actual answer.
Answer:
Excess fertilizers, herbicides and insecticides from agricultural lands and residential areas. Oil, grease and toxic chemicals from urban runoff and energy production.
Explanation:
How do scientists use observations
to make predictions?
Answer:
They use hypotheses to guess a result based on what they already know. Observations are used to record the results of an experiment. Predictions are used to have an expected outcome of a test, thinking the hypothesis is correct. Experiments are used to test the hypothesis.
The Somatic Nervous System controls all our voluntary muscle movements.
Group of answer choices
True
False
Answer:
it is true true
Explanation:
Answer:
its true
Explanation:
need help
6H2O + 6CO2
C6H12O6 + 602
Answer:
C6H12O6+6O2=6CO2+6H2O
QAmino acids differ from one another according to their R. or side carboxyl, COO- hydrogen, H amino, NH3+
Answer:
it's R or side
Explanation:
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Answer:
ok
Explanation:
Answer:
A. Both of them are correct
Explanation:
Mechanical waves include the movement of water, from ripples in a puddle to giant rolling waves on the surface of the open ocean. For example, water waves (mechanical waves) can transfer energy across an entire ocean basin, even though individual water molecules do not travel great distances.
Electromagnetic propagation through water is very different from propagation through the air because of water's high permittivity and electrical conductivity. Plane-wave attenuation is high compared to air and increases rapidly with frequency.
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Answer:
Compared to the use of many gasoline vehicles with only one person per vehicle, this method of transportation conserves more fossil fuels.
Explanation:
A form of transportation —such as the subway or streetcar— has capacity for many passengers and uses electricity as an energy source. This means fewer people using gasoline-vehicles, which leads to savings in fossil fuels, such as gasoline or diesel.
The decrease in the use of fossil fuels in vehicles has been proposed as an alternative to reduce environmental pollution and its consequences. One alternative is to consider mass transport vehicles that use alternative energy, a sustainable form of transport.
None of the other options are correct, as they involve more or the same use of fossil fuels per person.
A city is supplied by water from local wells. The city discharges its treated wastewater into the ocean.The city uses 25,000 liters of water per person per year. Precipitation falls in the amount of 25,000 liters per person per year.
Is the city using its water supply in a sustainable manner?
A)yes
B)no
Answer:
B)no
Explanation:
Sustainable use of water means use of water to fulfil various human needs for water without having any negative impact on the environment.
The sustainable use of water allows a minimum of 20 to 50 litres of daily water per person to fulfil their water needs, that means 600 litres maximum per person per year but in the given situation the city uses 25,000 litres of water per person per year.
This shows that people in the city are not using water sustainably which is causing a fall in precipitation.
Hence, the correct answer is "No".
Explain the purpose of cellular respiration .where does it take place ?
Answer:
Cellular respiration, it is an aerobic process in which glucose is combined with oxygen and Adenosine di-phosphate (ADP) to produce carbon dioxide, water, and Adenosine tri-phosphate (ATP).
Cellular respiration takes place in double membraned organelle called mitochondrion.
quick is de word...
taking yuh less than a min...
Answer:
renewable:
-wind
-forest
-water
-wildlife
-sun
non renewable
- coal
-soil
-natural gases
Explanation:
i googled it
hope this helps
brainliest?
During an annual check-up, the doctor typically feels the lymph nodes for swelling. What would swelling in the lymph nodes most likely indicate?
A.
the body is not receiving enough oxygen
B.
white blood cells are lacking nutrients
C.
white blood cells are growing uncontrollably
D.
the body is experiencing an infection
Answer: B
Explanation:
What is the smallest unit ?
Answer: B) cell
the smallest unit of life is a cell
CFU Question 1:
What is the relationship between the structure
and enzymatic function?
Answer:
Most enzymes are proteins and therefore their function is specific to their structure. Enzymes function as a catalyst to increase the rate of virtually all the chemical reactions that take place in a living system.
Explanation:
Which element gives water its ability to create either a weak acid or a weak base, depending on the solute being dissolved?
Answer:
hydrogen
Explanation:
the more hydrogen ions then lower the ph and the fewer hydrogen lions the higher the ph.
How do signals move from a sensory neuron toward the brain?
it goes throug the nerves to where your brai want to move the part
example
you want to walk it send signals to right leg thern left leg
Which of the following is a result of too many greenhouse gases in the atmosphere?
A: Glaciers melting
B: Sea levels rising
C: Cloud forests drying
Answer:
glaciers melting
Explanation:
thats what i would say
What is the difference between Primary and Secondary Succession?
Answer:
Some differences between primary and secondary succession are:
-Secondary succession happens on a previously existing community that has been cleared.
Another difference would be:
-Pioneer species for secondary succession are adapted differently- they grow quickly, can disperse quickly and have a short life span
And finally:
-Primary succession develops a new community from scratch
Not sure if you were looking for this, sorry if this is not correct.
HELP PLEASE BTW ITS NOT C I JUST PUT ANY ANSWER
Answer:
The answer would be D because it clearly states that the reactants are separated fron the products.
Which section of the Venn diagram represents the contents of the nucleus?
which best explains the mechanism that allows for cell differentiation ?
Answer:
Cellular differentiation
Explanation:
16. Name one organism that reproduces through binary fission
Answer:
Coral!
Explanation:
I learned this is a biology class a while ago!
Answer:
Bacteria
Explanation:
Using the law of conservation of mass, what is the mass, in grams, of the product in the given reaction?
Reactant 1 (35 grams)+ Reactant 2 (115 grams) →Product (? grams)
A. 80
B. 140
C. 150
D. 75
Answer:
The correct option is;
C. 150
Explanation:
By the law of conservation of mass we have that in a closed system, the mass of the items in the system can not be destroyed or created by a physical process or chemical reaction
In the given chemical reaction process we have;
Reactant 1 (35 grams) + Reactant 2 (115 grams) → Product = ((35 + 115) grams)
∴ Reactant 1 (35 grams) + Reactant 2 (115 grams) → Product (150 grams)
The mass of the product = 150 grams.