PLEASEEEEEEE HELPPPPPPPPPP I BEGGGGG FOR HELPPPPPPP
How many formula units are in a sample of salt, NaCl, with a mass of 87.75 grams?
Answers
Answer:
Number of Nacl units in mass of \(87.75\) grams \(= 1.50\)
Explanation:
Mass of one unit of NaCl or one atom of NaCl is \(58.44\) g/mol
The total mass of the NaCl is \(87.75\) grams.
The number of unit in \(87.75\) grams of NaCl is equal to \(87.75\) grams divided by mass of one unit of NaCl i.e \(58.44\) g/mol
This can be mathematically be presented as
\(\frac{87.75}{58.44} \\\) Units
\(1.50\) Units
Number of Nacl units in mass of \(87.75\) grams \(= 1.50\)
Related Questions
Argument 1
The water in the puddle that Claire observed evaporated. The highest temperature was 32°C (90°F). Since the puddle was there in the morning and gone later in the day, it must have evaporated.
Argument 2
The water in the puddle that Claire observed evaporated. Since the highest temperature was 32°C (90°F), we know that it was a warm day. When water gets hot, it can change from liquid to gas. This is called evaporation. I think the water became so warm that it became water vapor (gas), and that’s why the puddle was gone by the afternoon.
1. Which argument is more convincing?
2. Why is the argument you selected more convincing?
Answers
2. It gives more details
PLEASE HELP ILL GIVE BRAINLIST‼️‼️‼️‼️
At the atomic level are synthetic medicines different from natural medicines? If so explain how they are different.
Answers
In the following images, a blue circle represents an atom of one type of element, and a red square represents an atom of a second type of element. Determine which of them represent a pure substance, a homogenous mixture, and a heterogeneous mixture.
Are these in the right order?
Answers
Answer: No they are not. "Pure substance" is supposed to be placed in the middle picture. "Homogenous mixture" is supposed to be placed in the right picture. "Heterogenous mixture" is supposed to be placed in the left picture.
Explanation:
Pure Substances:
There are two categories of pure substances: elements and compounds (In our case, we have a compound).
Element (e.g. the blue circles or the red squares):
An element is a fundamental substance.An element cannot become simpler than itself, even if chemical separation methods are used.Compound (e.g. the blue circles bonded together with the red squares in the middle picture):
A compound is a substance made of two or more elements in fixed proportions (i.e. One element has the same amount as the other).A compound can be made into individual elements or simpler substances using chemical methods of separation.Mixtures:
There are two categories of mixtures: homo- and hetero- genous.
Homogenous mixture:
The substances or elements are mixed to look like one single substance and cannot be told apart (e.g. When salt dissolves in water, the water still looks like water).The substances or elements are distributed evenly throughout the apparatus. The number of different types of substances or elements can vary (e.g. There is more water than salt) The substances or elements do not bond together.Heterogenous mixture:
The substances or elements are mixed and can be told apart (e.g. When oil is mixed with water, the oil is "water-hating" so it forms its own layer on the bottom, while the water forms another layer on top of the oil layer).The substances or elements are distributed where one type of substance or element is bunched up in one spot and another substance or element in another spot.The number of different types of substances or elements can vary.The substances or elements do not bond togetherThe second Image is not a homogenous mixture, it is a heterogenous mixture as two different types of elements are mixed together.
The mix of two different types of elements in the heterogenous mixture is not uniform and has uneven mixed types.
The third image is a homogenous mixture as even though two different types of elements are together, they are not mixed with each other.
Unlike in the heterogenous mixture, in a homogenous mixture, there is a uniform mix of two different types of elements.
The first image is correct, the image depicts a pure substance.
To understand better about the Substances:
https://chem.libretexts.org/Courses/Los_Angeles_Trade_Technical_College/Foundations_of_Introductory_College_Chemistry/04%3A_Matter/3.5%3A_Pure_Substances_and_Mixtures
Which statement best describes gravity? (3 points)
a. It is the force that repels only very small objects.
b. It is the force that acts between objects with zero mass.
c. It is the force that sometimes acts only on very large objects.
d. It is the force that acts between any two objects in the universe.
Answers
Answer:
option d
Explanation:
have a nice day
The force that acts between objects
Why is it easier for most metal elements to gain electrons rather than to lose them?
PROPER EXPLANATION
Answers
Because it is easier for metals to shed their valence electrons and form cations for a stable configuration, they have comparatively few chances of acquiring electrons.
The metals usually complete their octet in each reaction. The outermost electron shell often contains more electrons in metals. Metal atoms lose electrons when they interact with other non-metals because the energy of an electron in its outermost shell is very weak.
Metals often have low ionization energy because their electrons are positive in nature. Metals lose their electrons and trade them with non-metals to achieve a stable configuration.
To know more about electrons in metals elements,
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Answer:
metals typically have relatively low ionization energies
Explanation:
these days cloths made out of a mixture of synthetic fiber and natural fibers are more popular than those made purly out of synthetic fiber. Discuss the reason for this
Answers
Answer: Clothes purely made of synthetic fibers are not comfortable in a hot and humid environment as they don't have the property to absorb water or sweat quickly so their water-resistant property makes them unsuitable for hot humid environment .
Explanation:
Mixing of synthetic fiber and natural fibers enhances the properties such as strength, elasticity, and ease of ironing and washing. Generally in hot environments it is preferred to wear a mixture of synthetic and natural fiber than wearing only clothes made from synthetic fiber .
Moreover, mixing synthetic fibres with natural fibres enhances their properties, such as strength, elasticity and ease of washing and ironing. Hence, these days clothes made out of a mixture of synthetic fibres and natural fibres are more popular than those made purely out of synthetic fibres.
Why do you think blood vessels and nerves are found in each of these structures like skin, muscles, and bone?
Answers
blood vessels help maintain your epidermis by transporting nutrients. Feeling different sensations: Nerve endings in your dermis allow you to feel different sensations, like pressure, pain, heat, cold and itchiness.
Bones are discrete organs made up of bone tissue, plus a few other things. The main misconception about bones then, is that they are made up of dead tissue.
You may think of changes in climate occurring as you go north or south. This climber stayed at the same latitude and went up. What explains the difference in temperature and climate between the top and bottom of Mt. Kilimanjaro? Please explain in 3-5 sentences thank you for 81 points
Answers
Answer: I'm not really sure but I think its dew to the different heights and tempura going up and down and the flow of wind.
Explanation:
Answer:
Mountains make it possible for snow to be found at the equator. Why does the temperature become colder the higher up a Mountain? Generally the climate on mountains get progressively colder with increased altitude (the higher up you go).
Explanation:
I need help quickly, this assignment is due in a few hours. I have a few 8th grade science questions I need help with. These is not need to explain your answer, just tell me if the answer is a,b, or c. Also, please answer all of the questions listed not just some of them. I will be giving 20 points if you answer, and brainly to the first person to answer. The questions look really complicated but it is mainly just a long description. The questions themselves seem simple.
QUESTION ONE : Miranda was learning to bake bread at home. Her first few batches of dough did not rise, or expand, as much as they should have. Miranda's mother noted that the kitchen was cold and suggested that the dough might not be warm enough to rise. Miranda decided to test her mother's suggestion. She made a large batch of dough and divided it into six equal-sized balls. Then, she put each ball into a bowl. She left three bowls on the counter in the kitchen, where the temperature was 63oF. She left the other three bowls on her desk in her upstairs bedroom, where the temperature was 80F. After one hour, Miranda measured the size of each dough ball.
Which of the following was the dependent variable in the experiment?
a. the temperature where the dough was left to rise
b. the ingredients used to make the dough
c. the size of each dough ball
QUESTION TWO: Jada liked to make guacamole, but she could often find only unripe avocados at the grocery store. In biology class, Jada learned that ripe fruits produce a gas called ethylene that can cause other fruits to ripen. Jada wondered whether storing ripe bananas with unripe avocados would make the avocados ripen faster. Jada prepared four paper bags with five unripe avocados in each bag. She added on ripe banana to two of the bags. Then, Jada sealed all four bags. After three days, she opened each bag and counted the number of ripe avocados in each bag.
Which of the following was the independent variable in this experiment?
a. the type of paper bag used
b. the number of bags with a ripe banana
c. the number of ripe avocados
QUESTION THREE: Colette was using steel to make rusted sculptures. After building each sculpture, she caused the steel in the sculpture to rust by placing it into tub filled with salt water for eight hours. Colette wondered if steel would rust faster submerged in vinegar instead of salt water. To find out, Colette cut ten squares of steel sheet metal and split them into two equal groups. She put one group of squares into a tub filled with salt water and the other group of squares into a tub filled with vinegar. Once an hour for eight hours, Colette counted the number of rusted steel squares in each group.
Which of the following was a variable that was held constant (control variable) in this experiment?
a. the type of liquid used
b. the size of the squares of steel sheet metal
c. the number of rusted steel squares
QUESTION FOUR: David divided 40 unripe bananas evenly among eight paper bags and sealed the bags. He poked 20 small holes in four of the bags and left the other four without holes. He kept the bags at room temperature for three days. Then, David opened the bags and counted the number of brown spots on each banana. He compared the average number of brown spots on bananas from bags with holes to the average number of brown spots on bananas from bags without holes.
Identify the question that David's experiment can best answer.
a. Do bananas develop more brown spots when they are kept at room temperature compared to in a cold refrigerator?
b. Do bananas develop more brown spots if they are kept in bags with holes compared to bags without holes?
c. Do bananas develop more brown spots when they are kept in brown paper bags compared to in a plastic bag?
QUESTION FIVE: Ten groups of chemistry students combined three solutions that, when mixed, chemically reacted and turned blue. Before mixing, five groups of students heated the solutions to 25C, and five other groups heated the solutions to 50C. The students recorded how many seconds it took for the mixtures to turn blue. Then, the groups shared their results, and the class compared the time it took for the mixtures to turn blue at 25C and at 50C.
Identify the question that the students' experiment can best answer.
a. Does the type of color the mixture produces depend on the temperature of the solutions?
b. Does the mixture of solutions release more gas when they are mixed at 25C compared to 50C?
c. Does the mixture's color change faster when the solutions are mixed at 25C or 50C?
Answers
Question 2: A
Question 3: B
Question 4: B
Question 5: C
Help! I need to finish work. Brainlist will be given to the most helpful!
Answers
Answer:
1. matches with elements.
2. matches with compounds.
3. matches with atoms
4. matches with weight
5. matches with gas
6. matches with carbon dioxide
7. matches with Mendeleev (there's an element named after him)
8. matches with IUPAC
Hope that helped :)
What is the charge on the Cr in Cr2O72-
Answers
Answer:
+6.
Explanation:
So, a chromium atom here has an oxidation number of +6.
Write a 4 paragraph essay explaining the types of asexual reproduction and the advantages and disadvantages of each. Include descriptive text in each and diagrams at the end if you would like.
(It's ok, to use online resources for information, but the essay must be in your own words in order to demonstrate understanding of the content.)
Answers
Answer:
Explanation:
There are different types of asexual reproduction:
Binary Fission
Budding
Fragmentation
Vegetative Propagation
Sporogenesis
Binary Fission
The term “fission” means “to divide”. During binary fission, the parent cell divides into two cells. The cell division patterns vary in different organisms, i.e., some are directional while others are non-directional. Amoeba and euglena exhibit binary fission.
It is one of the simplest and uncomplicated methods of asexual reproduction. The parent cell divides into two, each daughter cell carrying a nucleus of its own that is genetically identical to the parent. The cytoplasm also divides leading to two equal-sized daughter cells. The process repeats itself and the daughter cells grow and further divide.
Fragmentation
Fragmentation is another mode of asexual reproduction exhibited by organisms such as spirogyra, planaria etc. The parent body divides into several fragments and each fragment develops into a new organism.
Regeneration
Regeneration is the power of growing a new organism from the lost body part. For eg., when a lizard loses its tail, a new tail grows. This is because the specialized cells present in the organism can differentiate and grow into a new individual. Organisms like hydra and planaria exhibit regeneration.
Budding
Budding is the process of producing an individual through the buds that develop on the parent body. Hydra is an organism that reproduces by budding. The bud derives nutrition and shelter from the parent organism and detaches once it is fully grown.
Vegetative Propagation
Asexual reproduction in plants occurs through their vegetative parts such as leaves, roots, stems, and buds. This is called vegetative propagation. For example, potato tubers, runners/stolon, onion bulbs, etc., all reproduce through vegetative propagation.
Spore Formation
Spore formation is another means of asexual reproduction. During unfavourable conditions, the organism develops sac-like structures called sporangium that contain spores. When the conditions are favourable, the sporangium burst opens and spores are released that germinate to give rise to new organisms.
In asexual reproduction, a single cell is divided to produce offspring. Simple cell-by-cell division is not possible in multicellular organisms. Most of the multicellular organisms have a complex body design. They have a higher level of organization like tissues, organs and organ systems. Thus, they need a special mode for reproduction.
Advantages of Asexual Reproduction
Following are the advantages of asexual reproduction:
Mates are not required.
The process of reproduction is rapid.
An enormous number of organisms can be produced in very less time.
Positive genetic influences pass on to successive generations.
It occurs in various environments.
Disadvantages of Asexual Reproduction
The major disadvantages of asexual reproduction are:
Lack of diversity. Since the offsprings are genetically identical to the parent they are more susceptible to the same diseases and nutrient deficiencies as the parent. All the negative mutations persist for generations.
Since only one organism is involved, the diversity among the organisms is limited.
They are unable to adapt to the changing environment.
A single change in the environment would eliminate the entire species.
Asexual Reproduction Examples
Following are the examples of asexual reproduction:
Bacterium undergoes binary fission in which the cell divides into two along with the nucleus.
Blackworms or mud worms reproduce through fragmentation.
Hydras reproduce through budding.
Organisms such as copperheads undergo parthenogenesis.
Sugarcane can be grown through vegetative propagation.
Answer:
Explanation: The merging of male and female gametes during fertilization and the presence of two parents constitute sexual reproduction. The offspring differ from each other and their parents because they receive a variety of genes from both parents. The benefits of sexual reproduction include the offspring's ability to adapt to new surroundings due to genetic variation, which gives the species a survival advantage.
It is less likely that the disease will impact every person in a group. There is only one parent in asexual reproduction. The children are exact replicas of their parents and one another. Asexual reproduction has several benefits, including When conditions are favourable, the population can grow quickly because only one parent is required.
E. coli and other bacteria reproduce asexually. This has the benefit of enabling them to quickly create large numbers of bacteria. The identical genetic makeup of every microbe is a drawback. Every one of the germs would perish if an antibiotic were applied. There would be no people left. Random mutation is the sole process that can add variation to the population.
The majority of animals, including rabbits, reproduce sexually. Because the alleles that the mother and father each possess are combined in the offspring, sexual reproduction brings variety to the species. The fact that sexual reproduction requires more time than asexual reproduction is a drawback. Before the development of the progeny, a mate must be located and the egg fertilized with sperm. However, the benefits of adding genetic diversity to the species overcome this drawback. Given the diversity in the population, it's possible that not every rabbit would be afflicted if a disease struck the rabbit population. It follows that some people would live and be able to reproduce and have more children.
To know more: https://brainly.com/question/14329745
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What happens to air pressure and amount of oxygen as the altitude increases in Earth's atmosphere? 1. Air pressure decreases, while the amount of oxygen increases. 2. Both air pressure and the amount of oxygen increase. 3. Air pressure increases, while the oxygen decreases. 4. Both air and oxygen decrease.
Answers
Answer:
As altitude increases in Earth's atmosphere, both air pressure and the amount of oxygen decrease.
At sea level, the air pressure is about 1013.25 millibars (mb) and the concentration of oxygen is about 21%. As you go higher in the atmosphere, the air becomes thinner and less dense, so the air pressure decreases. At the same time, the concentration of oxygen also decreases because there is less air overall to contain oxygen molecules.
This is why it is harder to breathe at high altitudes, such as on a mountain. The air is less dense, so there are fewer oxygen molecules per breath and the body has to work harder to get enough oxygen.
Answer:4: Both Air and Oxygen decrease.
Explanation:This is in accordance with Henry's law. As pressure decreases solubility of gases decreases. Air pressure decreases as we altitude increases and the decrease in oxygen level is the consequence ,
Please help, I’ll give brainliest!
Answers
Answer:
the coefficient of NO3 is going to be 2
Explanation:
Cu+2NO3−+2H2O→Cu2++2NO2+4OH−
In self heating cans, the chemicals in two compartments react with each other and forms……..
Answers
calcium hydroxide : chemicals are Quicklime and water
Design an investigation that supports the claim that an increase in voltage OR an increase in the number of coils in an electromagnet, has an affect on the strength of the electromagnet. Be sure to include:
1. Problem/Question
2. Possible Data Table/Chart
3. Conclusion paragraph including data AND the effect of the increase in voltage or number of coils.
Answers
Answer:i dont know
Explanation:
What happens to the atoms that make up hydrogen fuel as it burns?
Answers
Answer:
When hydrogen fuel burns, its atoms combine with oxygen atoms in the air, which creates a chemical reaction that releases energy in the form of heat and light. The hydrogen atoms lose their outermost electrons, becoming positively charged ions (protons). These ions combine with the oxygen atoms to form water molecules (H2O), which evaporate into the air as steam. Therefore, the atoms that make up hydrogen fuel ultimately become part of water molecules during the process of combustion.
Explanation:
Quartz, or silicon dioxide (SiO2), is one of the most abundant minerals on Earth. The diagram shows the atomic arrangement of quartz.
Based on the diagram, which statement best describes the atomic arrangement of quartz?
Group of answer choices
An extended structure that is made of repeating patterns of atoms.
A repeating pattern of small molecules that can move freely past each other
Many different kinds of molecules tha combine to form an extended structure.
Many different kinds of atoms that can move freely past each other.
Answers
Based on the atomic arrangement of quartz, it is can be concluded that quartz is an extended structure that is made of repeating patterns of atoms.
What is quartz?Quartz is a hard crystalline mineral found within the Earth's crust and which is composed mainly of the mineral silica. Silica is mostly silicon(iv) oxide.
Quartz is colourless and its crystalline structure is of a hexagonal prism. The atoms are arranged in a regular repeating grid to form the hexagonal crystal.
Therefore, it is can be concluded that quartz is an extended structure that is made of repeating patterns of atoms.
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In an electrical wire, if instead of copper, plastic wire is used. Would it conduct electricity?Justify your answer.
Answers
Answer:
No, a plastic wire would not conduct electricity. This is because plastic is an insulator that does not allow electric current to flow through it. In a wire, electrical conductivity is provided by the movement of charged particles - typically, electrons. Copper is an excellent conductor of electricity because it has a high number of free electrons that are not bound to atoms and can move through the wire very easily. However, in a plastic wire, the tightly bound electrons of its atoms do not allow for the free flow of charges, thus preventing the passage of electric current.
According to the pH scale, which pH measurement is basic?
7.0
5.5
1.2
9.5
Answers
Answer:7.0
Explanation: Because acids are 1-3.9, 4 is neutral and bases are 4.1-7
Match these items.
1. imprint of plant or animal
original-remains fossil
2. undecayed plant or animal part
carbonized fossil
3. replaced by a mineral
petrified fossil
4. only carbon remains
cleavage
5. mountain
geology
6. from magma
metamorphic
7. from physical and chemical changes
igneous
8. sandstone
print fossil
9. helps identify rocks
landform
10. science of Earth
sedimentary
Answers
1. print fossil
2. carbonized fossil
3. petrified fossil
4. cleavage
5. landform
6. igneous
7. metamorphic
8. print fossil
9. geology
10. sedimentary
\(\)
The print fossil, original-remains fossil, petrified fossil, carbonized fossil, landform, igneous, metamorphic, sedimentary, cleavage, and geology are the respective matches as given in the question.
Print fossil is imprint of plant or animal and basically known as fossil impression. Original-remains fossil comprises of the original tissues and parts of organism and undecayed plant or animal part. Petrified fossil is replaced by a mineral. Carbonized fossil is only carbon remains. Landform is a mountain. Igneous is from magma.
Metamorphic is from physical and chemical changes. Sedimentary rocks are sandstone. Cleavage helps to identify rocks. Geology is the study of science of earth.
Learn more about rocks and fossils:
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How is the stimulus concept currently in our lives? (Ivan Pavlov) in TTQA
Answers
Answer:
stimulus is anything that can trigger a physical or behavioral change. The plural of stimulus is stimuli. Stimuli can be external or internal. An example of external stimuli is your body responding to a medicine. An example of internal stimuli is your vital signs changing due to a change in the body.
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A student uses this diagram to understand the parts of a fish. The student then uses an identification key to classify different types of fish.
Based on the key, which of these fish is most likely a bluegill?
The ferst imige is for the qwestion the rest are the answers
Answers
Answer:
The 3rd image is a blue gill
PLS HELP DONT GOGGLE!!
Answers
The area where the land meets the sea is called the coastline. This area can have different physical features depending on its location. Some common features of coastlines are beaches, cliffs, bays, harbors, estuaries, and dunes. Beaches are made up of loose particles like sand and gravel that are deposited by the sea.
In some areas, the shoreline may consist of a wide, sandy beach, while in others it may be rocky and steep.
In general, the shoreline is where the land transitions to the sea, and it is often marked by the presence of waves, tides, and other oceanic phenomena.
I just need help all I need is the answer please some one
Answers
Answer: The correct fill-in-the-blank answers are:
1. through binary fission (already filled in)
2. be resistant to penicillin
3. through asexual reproduction.
4. cell replicates before
5. a simpler process
Explanation:
The correct fill-in-the-blank answers are:
1. Bacteria reproduce through binary fission (already filled in)
2. A parent bacterial cell is able to survive in the presence of antibiotic penicillin. Subsequent generations from this parent will be resistant to penicillin
3. Something that potatoes and bacteria have in common is that they both reproduce through asexual reproduction.
4. In asexual reproduction DNA from the parent cell replicates before it produces daughter cells.
5. Asexual reproduction is a simpler process than sexual reproduction.
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help help help.
the answer choices are
a. gas
b. mirrors
c. steam
d. photovoltaic cell
Answers
Answer: I'm not totally sure if this is multiple choice or not but it's definitely D.
Explanation:
Help me out<3 i give brainliest if iz correct
Answers
Answer:
I believe the answer is B :)
Explanation:
If a substance has a density of 19 g/cm3, then what is the mass of 8 cm3 of this substance?
Answers
Which two elements are likely to form a compound that has ionic bonds?
sulfur and hydrogen
nitrogen and oxygen
sodium and chlorine
carbon and oxygen
Answers
Explanation:
for having a ionic bond we need great delta X that we see in electropositive atom (Na) and an electronegative atom(F)
How does the law of conservation of matter affect baking cookies?
Answers
Answer:
The Law of Conservation of Mass states that matter cannot be created or destroyed, although it can be rearranged. Baking cookies means that matter is rearranging it self
Explanation: