Answer:
Question is incomplete i have added full question at the end of this answer because im not able to add it in ask for detail section.
Answer:
1. Contaminate (Because NaOH is a base while H2SO4 is an acid. If student mix both this will result in chemical reaction.)
2. Contaminate (Because returning regents are used already id used regents put back in the bottle it will contaminate the fresh reagents.)
3. Contaminate (Using same spatula without sanitation results in mixing of one reagent into other regents which results in failure of experiments.)
4. Does Not Contaminate (It does not have any effect on the reagent because solid reagents are weighted that can be cleaned off when poured into reaction flask.)
5. Does Not Contaminate (Because washing flask after each experiment will wash off the left reagents present in flask.)
6. Contaminate (This will result in contamination because potassium iodide (KI) solution will be mixed with waste)
FULL QUESTION
Maintaining the integrity of the stock reagents is a constant concern in the lab environment. Read the following situations and decide if each represents a valid contamination concern.
1. A student uses a pipet designated for the NaOH solution to pipet the H2SO4 solution.
2. Several students have left-over reagents after the completion of an experiment and decide to return the excess reagents to their original containers.
3. Only one spatula is available to measure out several different white powders.
4.Rather than wasting multiple weigh boats, a student decides to wash and dry a single weigh boat in-between uses.
5. A group of students must use the same 500 mL volumetric flask to make solutions. Between each use they wash and dry the flask.
6. At the end of the day, the waste bottle is so full that a student decides to dump his waste into an almost empty bottle of stock KI solution.
The lyrics of this Beatles song reflect the teen thoughts and emotions of the early '60s and show the group's evolving style. It is ___.
a. "There's a Place"
b. "She Loves You"
c. "Thank You Girl"
d. "I Want to Hold Your Hand"
e. "All My Loving"
Answer:c
Explanation: I am a music teacher myself
The Beatles song that reflects the teen thoughts and emotions of the early '60s is "I Want to Hold Your Hand." It symbolizes young romance and helped define the band's early style, as well as contributing to the British Invasion and Beatlemania.
Explanation:The lyrics of the Beatles song that reflect the teen thoughts and emotions of the early '60s and show the group's evolving style are from "I Want to Hold Your Hand". This song marked a turning point in the Beatles' career and in popular music of the era. Its upbeat tempo, catchy melody, and innocent lyrics focused on holding hands as a symbol for young romance perfectly encapsulated the feelings and social norms of the time period.
Released in 1963, "I Want to Hold Your Hand" was a smash hit and became emblematic of the Beatles' early period. It was also one of the key songs that ushered in the British Invasion of the United States and the worldwide Beatlemania phenomenon.
Therefore, the correct answer to the provided options is d. "I Want to Hold Your Hand".
Use what you know about atmospheric circulation and seasonal changes in the sun’s orientation to earth to explain the highly seasonal rainfall in the tropical dry forest and tropical savanna biomes. (Hint: Why does the rainy season in these biomes come during the warmer months?)
Answer:
The Inter-Tropical Convergence Zone (ITCZ)region gets the most direct sunlight at any given period in time. This in turn causes air to be unstable with a drop in pressure and rise of air which cools and condenses into clouds to form precipitation causing the wet season in the tropics.
In this region, the sun is directly or almost overhead as seen during summer periods in the tropics.
Only in areas of the North and South of the ITCZ known as doldrums which at times are parallel to the ITCZ do we have high pressure that aren't conducive to precipitation causing dry season in the tropics.
In the ITCZ zone, we also have the tropical rain forests along the equator with huge amount of all round rain for the year.
Along the equator, on either side of the rain forests we have the dry and wet forests with the savannah to the North of this region and the southern hemisphere to the south of these forests since these forests are seen mostly in the ITCZ than the savannahs.
Rain shadows and ocean cueeebts may at times cause some savannahs to be along the equator and some rain forests -wet and dry forests- to be positioned further form the equator.
discuss factors that influence physical growth and development
Answer: Factors that affect physical growth and developments are;
1. Sex: sex of a person can affect physical growth and development. It is said that male tend to mature easily.
2. Nutrition. Bad nutrition can affect growth. When a person consume unbalanced and appropriate diets frequently, it will affect his development and growth.
3. Heredity: this is the transfer of genes from parent to offsprings. The type of genes or physical characteristics transmitted by parent to offsprings will determine the offsprings level of growth and development.
4. Hormones: if hormones necessary for growth and development are not secreted in the required amount, it can affect growth and development.
5. Environment: The environment we find ourselve determine our level of development.
6. Exercises and health: If you don't exercise daily, muscle development might not be visible and poor health after growth.
Explanation:
Growth is the increase in size of an individual.
Development is the increase in functionality and individuals ability . There are four stages of growth, infancy, childhood, adolescence and adulthood. Growth and development can be affected by several factors.
Signal Transduction Pathways What happens inside of a cell when a signal has been received?
When a signaling molecule joins with an appropriate receptor on a cell surface, this binding triggers a chain of events that not only carries the signal to the cell interior, but amplifies it as well.
Read the following scene:
Rainwater flows quickly over a grassland, filling lazy streams and soaking deeply into the ground. Days later, nearby vegetation grows quickly and the grassland seems to come to life.
Conclude that the above scene best represents which of the following two loops?
A) precipitation loop and evapotranspiration loop
B) surface runoff loop and groundwater loop
C) precipitation loop and groundwater loop
D) surface runoff loop and evapotranspiration loop
Answer:
Option (B)
Explanation:
The surface runoff usually refers to the flowing of water along an inclined surface over a large or small distance. These waters are accumulated in the land areas, rivers, and streams.
On the other hand, groundwater refers to the water that is present below the surface of the earth. When water accumulates over the land areas that are porous and permeable, it allows the water to percolate down into the deeper zone and eventually becomes groundwater.
In the given condition, the flowing of the water over the grassland areas and adding to the streams refers to the surface runoff loop. And the percolation of water into the deeper root zone and enriching the vegetation refers to the groundwater loop.
Thus, the correct answer is option (B).