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?
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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The artic tundra, though very cold for much of the year, is said to be more strongly defined by its cool summer temperatures, instead of its winter lows why?
A. because these low summer temperatures cause rapidly changing weather
B. because these low summer temperatures limit the growth of plants in the summer
C. because these low summer temperatures cause large masses of ice that do not even totally melt in the summer
D. because these low summer temperatures cause a rain-shower effect
To produce electricity, a generator needs what kind of input?
Answer:
Mechanical Energy (maybe)
No links Biodiversity is highest near the
Temperate zones
oceans
equator
the poles
BRAINLIESIT IF CORRECT
Sound waves travel as particles of matter collide and transfer energy.
True
False
6
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.
Please help, thank you very much! :)
Answer:
C
Explanation:
Thermal produces heat that is all around us even in ice because all matter contain heat enegry.
Answer:
1 2 3 it's because yes nnnnnn
How does meiosis help in creating genetic diversity?
Group of answer choices
By replication of parental DNA
By pinching off a bud from the parental body
by creating individually unique cells.
By pairing up of homologous chromosomes
Really need help!
How are luminosity, apparent mange, and absolute magnitude different? How are they similar?
Why might hydrogen be a wonderful fuel for the future?
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.
Rainforest are generally defined by two factors chose all that apply
The rain must stop during b the year
There must be 69-78 inches of rain per year
There must be 80- 100 inches per year
No rain must be distributed throughout the year
Answer:
C and D
C. There must be 80- 100 inches per year
D. No rain must be distributed throughout the year ;)
Explanation:
Answer:
C,D
c. there be 80- 100 inches of rain per year d. no Rian must. be distributed throughout the year
can anyone help me with this ( no links )
Essentially lots of rain consistently throughout the year is key to maintaining the large amount of ---------that makes up a rainforest.
Animal life
ocean life
plant life
all of the choices
Answer:
plant life
Explanation:
every plant on Earth is nurtured by water in the soil.
Where is the ozone layer located (which layer of the atmosphere
It is located in the Stratosphere.
Answer: in stratosphere
After reading this answer the question:
Why might hydrogen be a wonderful fuel for the future?
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
BRAINLIESIT IF CORRECT
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.
Answer:
I dn't mnoefbv
Explanation:
Gr
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
Answer:
B . the range is from 15-25 cm(6-10 inches) a year where most falls as snow
BRAINLIESIT IF CORRECT
1
Answer:
Reflected
Explanation:
I hope you get it right!!
Answer: absorbed
Explanation: darker colors absorb more light and heat
Which compound would not neutralize hydrochloric acid?
A. Sodium Hydroxide
B. Sodium Carbonate
C. Sodium Chloride
D. Sodium oxide
Answer:
its B
Explanation:
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)
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.
No links The soil rainforest are______
nutrient rich
Nutrient poor soil
Mediocre
Rich in clay
please help no trolls no links pls
How does changing the mass of a wheelchair affect its velocity?
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...
The rainforest contains what percentage of all of the species in the world?
25%
50%
75%
10%
Answer:
I think 50%
Explanation:
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-----------Refers to the soil that is frozen solid all year round does not even melt in the summer.
Frost
Glaze
Permafrost
Verglas
The answer is "permafrost". Permafrost is soil/ground that stays frozen year-round.
What is the role of a generator in producing electricity?
Answer:
The generator stores electrical energy
Explanation:
The generator stores electrical energy for later use in homes and businesses. The generator transforms the mechanical energy of the turbine into electrical energy. The generator reverses the turbine to create electrical energy. The generator spins the turbine to create mechanical energy.25 May 2017
A teacher attaches two balloons each to a stick. She charges each balloon, as shown in the images, and moves them a certain distance apart. She repeats the steps three more times with various arrangements. Which arrangement and charge combination represents the greatest electrical potential energy between the balloons?
Answer:
Bones, lungs, and the liver are the most common places for cancer cells to spread, or "metastasize." Once in the bone, these cancer cells can form new metastatic tumors.
...
Bone metastasis is more likely with cancers such as:
Breast.Prostate.Lung.Kidney.Thyroid.
Explanation:
Use operations of decimal, fraction, and percent numbers to model the following scenarios. In your final answer, include only an equation or proportion modeling the scenario. Do not solve the problems.
A family dines in a popular franchise restaurant. At the end of the meal, they decide to leave their server a monetary tip that is equal to 20% of the total bill amount, $60.50. How much will the family leave their server as a tip?
A family dines in a popular franchise restaurant. They plan to use a coupon that will give them a discount of 15% off of their total dinner bill, not including applicable sales tax or their server’s tip. If the family’s dinner bill totaled $34.00 before tax and tip, how much money will they save by using the coupon?
A family dines in a popular franchise restaurant. They plan to use a coupon that will give them a discount of 10% off of their total dinner bill, not including applicable sales tax or their server’s tip. The bill totals $157.30 before tax and tip. What is the new total after the server applies the 10% off coupon?
A family of eight dines in a popular franchise restaurant. The restaurant has a policy of automatically including a standard tip to the final bill for parties larger than six people. The bill for the meal included a total of $58.25 in food and beverage sales, plus a standard tip of $10.49. What percent of the food and beverage sales does the restaurant consider to be a standard tip for parties larger than six?
A family dines in a popular franchise restaurant that has a policy of automatically including a 20% tip on all food and beverage sales before coupon discounts are applied. What is the family’s total bill amount if their food and beverages totaled $94.20 and they used a 15% off coupon? (HINT: Create more than one model.)
No links What lives in the Arctic tundra biome? Choose all that apply
Reptiles, amphibians,lots of insects, reindeer, caribou, muskox
Answer:
Muskox reindeer and caribou
BRAINLIESIT IF CORRECT
3
Help Please. It's On Erosion. 15 Points
please help no trolls or links pls
What are some differences in the design of wheelchairs for racing vs rugby?
Answer:
-a shorter seat, without hardest or armrest to allow ease of movement
-adapted tires
-inclined wheels
-a reinforced frame
-a reclining seat