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Related Questions
A chemist performs the same tests on two white solids, A and B. The results are shown in the table below.
image
Which result identifies the substances, A and B, correctly?
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The melting point of a substance is characteristics to it. Hence, we can identify a compound by calculating its melting point. If the solids are pure they will give their characteristic actual melting point.
What is melting point?Melting point of a substance is the temperature at which it converts from solid state to liquid state where, the two phases are in equilibrium. Melting point is dependent upon the intermolecular forces, molar mass, temperature and presence of impurities.
Melting point of a pure substance is a characteristic feature for it. Hence, we can qualitatively test a compound using its melting point and using standard dats of melting points we can identify the substance.
Conductivity, solubility etc. are not characteristic for a substance and can be similar to other solids. Therefore, option A melting point tests helps to identify A and B.
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After reading this answer the question:
Why might hydrogen be a wonderful fuel for the future?
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Explanation:
hydrogen will join electricity as an important energy carrier since it can be made safely from renewable energy sources and is virtually non-polluting
Scientists claim to be the way the continents were arranged 250 million years ago. Scientists who make this claim call this ancient organization of continents Pangaea. Provide evidence that supports the scientists’ claim that Pangaea existed. Also include the scientific reasoning that links the evidence to the scientist’ claim.
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Answer:
I dn't mnoefbv
Explanation:
Gr
Help No links Temperate grasslands are a division of a larger biome grouping of v grasslands that includes Tropical
Tropical savannas
Desert
Temperature grasslands
Tropical rainforest
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Answer:
tropical Savannas. hope helpful answer
Where is the ozone layer located (which layer of the atmosphere
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It is located in the Stratosphere.
Answer: in stratosphere
Read the following passage:
Wind and water carry sand, debris, and small pieces of rocks and deposit them in layers. These layers pile up and after many years form a single rock called Rock A. The movement of tectonic plates buries Rock A deep inside Earth. Heat and pressure change the mineral composition of Rock A and transform it into Rock B. Rock B comes out to the surface of Earth due to plate movements.
Which type of rock has been formed?
Group of answer choices
metamorphic
sendimentary
igneous
fossils
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Answer: I think that it is either B or D
please help no trolls no links pls
How does changing the mass of a wheelchair affect its velocity?
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Explanation:
Mass and velocity are inversely propotional, which means that if you increase the mass of the wheelchair the velocity would automatically decrease, similarly, if you decrease the mass of the wheelchair the velocity of the wheelchair would increase.
Hope that helps...
Humidity refers to the moisture in the air or the amount of water vapor found in the air and it is very high and rainforest around 80%
true or false
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The functions of two physical structures of plants are described below: (2 points)
Structure 1: Holds the leaves of the plant toward the light.
Structure 2: Helps reduce water loss.
What statement is true about the functions?
a
Structure 1 is the stamen and Structure 2 is the pistil.
b
Structure 1 is the stem and Structure is the waxy covering.
c
Structure 1 is the pistil and Structure 2 is the fuzzy hair.
d
Structure 1 is the waxy covering and Structure 2 is the stamen.
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ohhhhhhhhhh
BRAINLIESIT IF CORRECT
4
Answers
Answer:
the answer is vacum of space
Answer:
1. a medium
2.longitudinal
please help no trolls or links pls
What are some differences in the design of wheelchairs for racing vs rugby?
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Answer:
-a shorter seat, without hardest or armrest to allow ease of movement
-adapted tires
-inclined wheels
-a reinforced frame
-a reclining seat
BRAINLIESIT IF CORRECT
Sound waves travel as particles of matter collide and transfer energy.
True
False
6
Answers
sound travels as energy, unlike light.. the waves transmit energy by changing the motion of particles. The particles are moving in the same direction as the wave.
Answer:
True
Explanation:
Sound waves require a medium/substance to transmit through, for example, sound waves cannot travel through the vacuum of space . The medium, water or air, itself does not move in bulk with the wave . The medium's particles carry kinetic energy from one point to another . This is when the wave transmits through its medium, the particles simply vibrate as the wave passes through. The vibrations carry the energy from one particle to the next. This means that the sound wave is carried through the medium.
*Note: Sound waves need particles to travel but light does not.
NO LINKS RIGHT ANSWERS ONLY!!!!
How do waves form?
A. Ocean waves form as wind is absent
B. Ocean waves form as wind moves across the surface transferring it's energy to the water
C. Ocean waves form as salinity increases
D. Ocean waves don't form
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No links What lives in the Arctic tundra biome? Choose all that apply
Reptiles, amphibians,lots of insects, reindeer, caribou, muskox
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Answer:
Muskox reindeer and caribou
NO LINKS RIGHT ANSWERS ONLY!!!!!!!
-----------Refers to the soil that is frozen solid all year round does not even melt in the summer.
Frost
Glaze
Permafrost
Verglas
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The answer is "permafrost". Permafrost is soil/ground that stays frozen year-round.
Explanation:
is vineasel edible??????????????????????/
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Answer:
no it's not edible
um no? what did you do...?
Can I get some help plzz
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Answer:
It's row in the table
Explanation:
It is the number of electrons at the outermost shell of an electron eg. The valence electron of sodium is one.
can anyone help me with this ( no links )
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Why might hydrogen be a wonderful fuel for the future?
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Answer:
In the future, hydrogen will join electricity as an important energy carrier, since it can be made safely from renewable energy sources and is virtually non-polluting. It will also be used as a fuel for 'zero-emissions' vehicles, to heat homes and offices, to produce electricity, and to fuel aircraft.
Answer:
It can be a wonderful fuel, because unlike other sources of power generation, it produces no greenhouse gas and hence does not contribute in polluting the environment or causing global warming. However it can be a dangerous fuel as well, as it is highly flammable.
Please help this is due today!
Military submarines incorporate multiple technologies in order to remain silent and undetected in the water. Submarine crews are cautioned not to make loud sounds or drop tools or equipment to avoid detection. Use what you have learned about the factors that affect sound transmission to explain why submarines have to be careful not to make sounds while other military craft, such as airplanes or tanks, don't have to worry about the sounds they make? Use evidence and scientific reasoning to support your response.
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Answer:
Explanation:Military submarines are designed to roam the oceans undetected by enemies or spies. They rarely surface, except to establish radio contact or perform data communication with their respective headquarters. Otherwise, their job is to be as silent as possible.
Answer
Sorry if this is incorrect, but I think the reason submarines have to stay quiet is because they want to evade discovery by passive sonar.
Explanation:
My explanation is because passive sonar detects acoustic signals and sounds which are detected because sound travels faster in water compared to air.
Hope this helps!
The rainforest contains what v percentage of all of the species in the world
25%
50%
75%
10%
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Answer:
50%
Explanation:
Please let me know if its right.
i will give brainly to correct answer (if you dont get brainly lmk if you want me to make a fr33 p01nts post so i can give you it)
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Answer:
The stoma allows the intake of oxygen gas in photosynthesis and releases oxygen gas in respiration.
Explanation:
Through photosynthesis, leaves turn light energy into food. Through pores, or stomata, leaves “breathe” in carbon dioxide and “breathe” out oxygen. Leaves also release excess water, much like we sweat.
What adoptions do trees have in the rainforest
Deep roots and spread their roots out over a great distance
Deep roots that do not spread out over a great distance
Short roots and spread out over a great distance
Short roots that do not spread over a great distance
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Help Please. It's On Erosion. 15 Points
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Notice the clear water.
10 points please help
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No links The soil rainforest are______
nutrient rich
Nutrient poor soil
Mediocre
Rich in clay
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The forces exerted between electric charges at a distance is evidence that each charge is surrounded by an electric _____.
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The forces exerted between electric charges at a distance is evidence that each charge is surrounded by an electric field.
The forces exerted between electric charges at a distance is evidence that each charge is surrounded by an electric field.
The force exerted on an electric charge at any given distance is determined by applying coulomb's law as shown below;
[tex]F = \frac{kQ^2}{r^2}[/tex]
The electric field strength of the charge is given as;
[tex]E = \frac{F}{Q}[/tex]
F = EQ
where;
E is the electric field Q is the electric chargeThus, we can conclude that the forces exerted between electric charges at a distance is evidence that each charge is surrounded by an electric field.
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BRAINLIESIT IF CORRECT
3
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No links right answers only!! 9recipitation like in the Arctic tundra.
A. In the summer, it typically rains less van 5 cm (2 inches) while in Winter it rains 25-44cm ( 10 -17 inches)
B. The range is form 15-25cm (6-10 inches) a year where most falls as snow
C. There is an average of 20-35 inches of rainfall a year
D. It can also be called a cold desert due too its lack of precipitation
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Answer:
B . the range is from 15-25 cm(6-10 inches) a year where most falls as snow
Which compound would not neutralize hydrochloric acid?
A. Sodium Hydroxide
B. Sodium Carbonate
C. Sodium Chloride
D. Sodium oxide
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Answer:
its B
Explanation: