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?
Answers
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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Related Questions
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
Answers
Answer:
tropical Savannas. hope helpful answer
BRAINLIESIT IF CORRECT
4
Answers
Answer:
the answer is vacum of space
Answer:
1. a medium
2.longitudinal
For the following reaction:
CaO(s) + CO2(g) ⇄ CaCO3(s) ΔH = -178.5 kJ
Which of the following changes would increase the rate of the forward reaction?
Add CaO
Remove CaO
Add CO2
Remove CO2
Add CaCO3
Remove CaCO3
Increase temperature
Decrease temperature
Increase pressure
Decrease pressure
Answers
The concept Le Chatelier's principle is used here to determine the effect of change of concentration, pressure and temperature on the state of equilibrium.
What is Le Chatelier's principle?According to Le Chatelier's principle, If a system in equilibrium is subjected to a change in concentration, pressure or temperature the equilibrium shifts in the direction that tends to reduce the effect of the change.
Here adding CaO increases the rate of forward reaction. If the concentration of any reacting species is increased, the equilibrium will shift in the forward direction.
The given reaction is exothermic in forward direction. So the increase of temperature shift the equilibrium to the backward direction and the decrease in temperature shift the equilibrium to the forward direction.
Here increasing pressure will shift the equilibrium to the forward direction accompanied by a decrease in the number of moles.
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BRAINLIESIT IF CORRECT
Light waves are electromagnetic waves that can travel through a vacuum.
True
False
7
Answers
Answer: True
Explanation:
Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.
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#[tex]AnimePower[/tex]
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.
Answers
ohhhhhhhhhh
WILL GIVE LOTTA POINTS AND MAKE BRAINLIEST
Which compound would not neutralize hydrochloric acid?
A. Sodium Hydroxide
B. Sodium Carbonate
C. Sodium Chloride
D. Sodium oxide
DON SPAM ONLY WRITE IF YOU KNOW THE ANSWER
Answers
Answer:
A sodium hydroxide
Explanation:
ohhhhhhhhhhh
The sardines are not the jellies’ resource population or consumer population, but they still caused the jelly population in North Benguela to increase. How did this happen?
(there's no science option)
Answers
Answer:
this is happened because of the rising demand of the sardine fish in that area
Explanation:
Temperate grasslands have trees and shrubs
True or false
Answers
Temperate grasslands do not have trees and shrubs.
Temperate grasslands have trees and shrubs. This statement is false.
What do temperate grasslands have?Cold winters and mild, rainy summers are characteristics of temperate grasslands. Every year, grasses wither to their roots, and the soil and sod shield the roots and young buds from the winter cold or dry circumstances.
Because of the lack of rainfall, this biome may have a few trees along the streams, but not many.
The correct amount of rain and other factors aren't present in grassland ecosystems for trees to flourish, yet there is enough rain for grass to grow and cover the ground there. The length of the grass in grassland ecosystems can vary depending on the precise amount of rainfall.
Thus, Temperate grasslands do not have trees and shrubs.
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is vineasel edible??????????????????????/
Answers
Answer:
no it's not edible
um no? what did you do...?
Why is diversity in the field of science important?
Answers
Answer:
Scientific progress relies on problem solving and collaboration. Groups composed of people with diverse experiences and areas of expertise tend to be more creative and innovative. Asking questions drives science forward, and scientists with different perspectives often ask different questions.
Explanation:
which of these objects in the solar system have impact craters.
The Moon
Earth
Mars
Answers
Answer: The moon
Explanation: hope this helps.
the moon because it's the closest
What is the difference between diurnal and nocturnal.
Diurnal means active at night
Diurnal means awake during the day, and use the light to the advantage
Nocturnal means awake during the day and use the light to their advantage
Nocturnal means active at night
Answers
Answer:
Diurnal means active at night and Nocturnal means awake during the day and use the light to their advantage
Explanation:
(Just in case you need clarification, I believe the exact definition of Nocturnal is as follows:
Done, occurring, or active AT NIGHT. The exact definition of diurnal, in this case (for animals), is: Active IN THE DAYTIME. The person above was either messing with you or did not look up their facts. Either way, I’m sorry about the inconvenience. I hope I was able to help in time to make a difference.)
MULTIPLE CHOICE QUESTION + DIAGRAM IN PICTURE
CORRECT ANSWER = BRAINLIEST
Answers
Answer:
B!
Explanation:
None of the other answers work with the chart correctly :)
Can I get some help plzz
Answers
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.
Making wire from a block of copper.
Physical Change
or
Chemical Change?
Answers
Answer:
physical
Explanation:
Answer:
Physical Change ...........
Something that an animal does that is driven by instinct is called a??
1.phycial adaption
2.behavioral adaption
Answers
Answer:
2. Behavioral Adaption
Explanation:
I know about this, I think this is the answer. Try it out!!
The forces exerted between electric charges at a distance is evidence that each charge is surrounded by an electric _____.
Answers
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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What genotype will appear in box 4?
Answers
Hope this helps!
Answer:
tt
Explanation:
put the two letters that are in the same vertical and horizontal row together
Identify the state of matter: Takes the shape of the container that it's in,
particles are very far apart, particles have high thermal energy.
Answers
The state of matter that is described is a gas; in a gas, the particles are not held together in a fixed arrangement like in a solid but are instead free to move and take on the shape of their container.
What is gas property?The state of matter being described here is gas. In a gas, the particles are not held together in a fixed arrangement like in a solid but are instead free to move and take on the shape of their container. Gas particles are very far apart from one another compared to particles in solids and liquids, which allows them to easily flow and diffuse. Gases also have high thermal energy, meaning their particles are in constant motion and collisions between particles are frequent. This results in gases expanding to fill any available space and exerting pressure on the walls of their container.
Hence, the state of matter that is described is a gas, as in a gas the particles are not held together in a fixed arrangement like in a solid but are instead free to move and take on the shape of their container.
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Place the following taxonomic ranks in order from most specific to least specific. A) Order; B) Phylum; C) Family
Answers
The taxonomy is a branch of biology which classifies the living things. It was given by Carolus Linnaeus. The taxonomic ranks in order from most specific to least specific is family, order and phylum.
What is Taxonomic Hierarchy?The process of arranging different kinds of organisms into successive levels of the biological classification either in a decreasing or an increasing order from kingdom to species and vice versa is known as Taxonomic hierarchy.
Each level of the hierarchy is defined as the taxonomic category or rank. In this system of classification, Kingdom is always ranked the highest which is then followed by division, class, order, family, genus and species.
The correct order of Taxonomic Hierarchy is:
Kingdom - Phylum - Class - Order - Family - Genus - Species.
The species is the lowest level of the taxonomic Hierarchy. This can be further divided into sub-species.
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The reproductive organs of the male
The reproductive organs of the female are the
The ovaries produce the
The testes produce the
Word Bank
ovaries, testes, sperm, eggs
Answers
Answer:The reproductive organs of the male: Testes
The reproductive organs of the female are the: ovaries
The ovaries produce the: Eggs
The testes produce the: Sperm
Female reproductive organs: ovaries
Ovaries produce: eggs
The testes produce: sperm
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
Answers
Answer: I think that it is either B or D
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.
Answers
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!
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
Answers
Answer:
B . the range is from 15-25 cm(6-10 inches) a year where most falls as snow
10 points please help
Answers
Choose all that apply for grasslands
No trees or shrubs
Rainfall is low
Occur in all climatic zones
Contains grasses and Woody plants
Answers
Answer:
-rainfall is low
-occur in all climate zones
-contains grasses and woody plants
The grasslands occur in all climatic zones, contains grasses and Woody plants and rainfall is low. Therefore, option B, C and D are correct.
What do you mean by the grassland ?The grassland biome is made up of broad, open grassy areas. They are kept healthy by animals that feed on them and frequent fires. There are two main types of grasslands: savannas and temperate grasslands.
Grasslands are grassy areas that are often flat, open, and continuous. In high latitudes, they are usually located between subtropical deserts and temperate forests.
Due to the environment, only grasses can thrive in grassland areas. Low precipitation rates are adequate for grasses but not for a forest of trees. Frequent fires also help to preserve grassland ecosystems. Grasses are ideal for recovering from a fire.
Thus, option B, C and D are correct.
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The rainforest contains what v percentage of all of the species in the world
25%
50%
75%
10%
Answers
Answer:
50%
Explanation:
Please let me know if its right.
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
Answers
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
Answers
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