Answer:
Explanation: Four ways you can avoid injury while using HCl -
a) It's concentrated form is highly toxic so better use in the experiment hood.
b) Don't inhale its fumes.
c) Use lab coat while performing experiments.
d) Protect your eyes by wearing eye glare.
Three steps you would take in case of an accidental exposure to HCl -
a) Inform the lab assistant and teachers regarding the mishap.
b) Don't try to use any kind of ointment or medicated thing on the affected area without any medical advice.
c) You can use sodium bicarbonate to neutralize it.
how do you know that a sealed calorimeter is a closed system?
a) because temperature is conserved
b) because the masses of the sample and water are equal
c) because thermal energy is not transferred to the environment
d) because work is done on the test sample
Answer: Option (c) is the correct answer.
Explanation:
When a system is open then there will be exchange of energy between the system and surrounding.
Whereas when a system is closed then there will be no exchange of energy, that is, thermal energy will not flow into the atmosphere.
Thus, we can conclude that a sealed calorimeter is a closed system because thermal energy is not transferred to the environment.
Final answer:
A sealed calorimeter is a closed system because it does not allow thermal energy to transfer to the environment, allowing for conservation of energy within the system. The correct option is c.
Explanation:
A sealed calorimeter is considered a closed system primarily because thermal energy is not transferred to the environment. By being sealed, it allows energy in the form of heat to be exchanged within the system (the chemical reaction and the water in which the reaction occurs), but it does not allow matter or heat to escape or enter from the external environment. The principle that supports the calorimeter's status as a closed system is the conservation of energy, meaning no overall energy change occurs during the chemical reaction when considering both the system and its surroundings.
Differentiating between types of systems, an open system can exchange both energy and matter with its surroundings, such as a pot of boiling water. A closed system, like a sealed calorimeter, can exchange energy but not matter. An isolated system exchanges neither energy nor matter, but such systems are theoretical as all real systems will eventually exchange some energy with their surroundings.
The sealed calorimeter fits the definition of a closed system because it allows for the exchange of energy within the system while maintaining its mass constant, indicating that no mass is exchanged with the external environment.
what is the total amount of heat, in joules, required to completely vaporize a 50.0-gram sample of liquid water at its boiling point at standard pressure
What is the main factor that prevents the growth of tropical plants in the northern part of the United States?
A) Predators
B) Overpopulation
C) Pollutants
D) Climate
describe how you would separate a mixture of water sand pebbles and paper clips
Answer:
Explanation:
Separation
How many molecules are in 3.2 mol of ammonia,NH3
To find the number of molecules in 3.2 mol of ammonia (NH3), we can use Avogadro's number. Multiply 3.2 mol by Avogadro's number (approximately 6.022 x 10^23 molecules/mol) to get approximately 1.9264 x 10^24 molecules.
Explanation:To calculate the number of molecules in 3.2 mol of ammonia (NH3), we can use Avogadro's number. Avogadro's number is approximately 6.022 x 1023 molecules/mol. So, to find the number of molecules in 3.2 mol of ammonia, we multiply 3.2 mol by Avogadro's number:
Number of molecules = 3.2 mol x 6.022 x 1023 molecules/mol = 1.9264 x 1024 molecules
Therefore, there are approximately 1.9264 x 1024 molecules in 3.2 mol of ammonia.
Learn more about Number of molecules in a given amount of substance here:https://brainly.com/question/36908365
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A scientist took a sample of enzymes from cow saliva and mixed them with a form of starch found in grains. After a while the starch broke into many smaller molecules. This shows that
Question 2 options:
cows should not be fed grains.
cows do not use the food that they eat.
cows break down the food that they eat.
grains are made of enzymes.
Answer:
The answer is cows break down the food that they eat
Explanation:
Organisms, such as cows, that eat plants or animals break down the food they have eaten using acids and digestive enzymes. The broken down food is used by their bodies to produce building materials and the energy that they need to survive.
15 POINTS! HELP!!
The Doppler effect is used in police car to measure _______?
a) temperature
b) weather
c) speed
d) reckless driving
Study the diagram of a cell.
Which structures are found in both plant and animal cells?
W and X
W and Z
X and Y
Y and Z
Answer:
W and Z
Explanation:
W is cell membrane and Z is mitochondria. Both plant and animal cells have cell membrane, which is semi-permeable and slows the exchange of certain molecules in and out of the cell. Mitochondria is present in both animal and plant cells. Mitochondria is known as the powerhouse of cell. ATP through oxidative phosphorylation is generated in the mitochondria.
The population of wild turkeys in an area tripled over the course of three years. Which of the following could be a contributing factor?an increase in the population of domestic turkeys an increase in predators decrease in resources decrease in predators
I need help with # 7
Hellllllpppppp this is soooo hard
Why does ammonia, NH3, behave as a base when it reacts with an acid?
scientists have determined the average salinity of ocean water to be equal to ___
a. 3.45 g/mL
b. 34.5 g/kg
c. 34.5 g/mL
d. 3.45 g/kg
What started the Russo-Japanese War?
Answer:
Late in the night on February 8, 1904, Japan launched a surprise attack against the Russian-held Port Arthur, along the coast of Manchuria, beginning the Russo-Japanese War.
Explanation:
hope this helps
Final answer:
The Russo-Japanese War started due to territorial disputes in Manchuria and Korea, with Japan launching a surprise attack on Port Arthur in 1904. Japan's victory altered international relations and signaled the rise of Asian military prowess against European powers.
Explanation:
The Russo-Japanese War began primarily due to territorial rivalries in Manchuria and Korea. In the winter of 1904, Japan initiated the conflict with a surprise naval attack on the Russian fleet at Port Arthur because of Russia's military presence in Manchuria and its refusal to recognize Japan's interests in Korea. Industrialization in Japan played a crucial role, enabling its military to achieve rapid victories over Russia. This conflict ended with the signing of the Treaty of Portsmouth in 1905, with Japan gaining control over Korea and parts of Manchuria. The war not only demonstrated Japan's industrial military power but also influenced international dynamics by challenging European influence in Asia and stirring political unrest within Russia.
number of molecules of water in 6 moles
A 15 mL sodium hydroxide solution of unknown concentration is titrated with 34.5ml of 1.2M HCl solution. What was the concentration of the sodium hydroxide solution?
what fossil fuel accounts for 95% if consumption for transportation
Answer:
nuclear energy i think
Explanation:
The lowest stratum of the atmosphere is the ______________.
stratosphere
troposphere
mesosphere
2.
Most of the earth's ozone is located in the _______________.
stratosphere
troposphere
mesosphere
3.
Earth's coldest temperatures occur in the _______________.
stratosphere
mesosphere
troposphere
Which environmental changes occur Fastest
The environmental change that occur fastest is the volcanic eruption.
What is a volcanic eruption?It should be noted that the volcanic eruption simply means when lava when gas are released from volcano.
The environmental change that occur fastest is the volcanic eruption and it should be noted that the most dangerous one is known as the glowing avalanche.
Learn more about volcano on:
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Final answer:
The fastest environmental changes today include climate change, loss of biodiversity, and alterations to the water cycle, all of which are significantly accelerated by human activities, particularly since the mid-20th century.
Explanation:
Notably, the fastest environmental changes currently occurring relate to climate change, loss of biodiversity, and changes in water cycles. These changes are largely driven by human activities, notably since the mid-20th century, a period often referred to as the Great Acceleration, indicating a steep increase in population growth, GDP, and resource consumption leading to a profound ecological impact. Climate change is one of the most dramatic examples of rapid environmental alteration. It is occurring at a pace unprecedented in human history, with global temperatures projected to rise significantly within a single century, a rate at least 100 times faster than naturally occurring changes. This swift change is too rapid for many social systems, natural species, and ecosystems to adapt, leading to increased risks of extinction, spread of diseases, and more frequent catastrophic natural disasters.
Another swift change is seen in the loss of biodiversity, where species are going extinct at a rate much higher than the natural background rate, primarily due to habitat destruction, pollution, overexploitation, and climate change. Additionally, water cycles are being altered, with some regions experiencing more intense droughts and others more severe flooding, challenging existing agricultural practices and water management systems.
All moving parts produce friction. true or false
Will give brainliest .Antarctica is believed to have always been positioned at it's current spot on the Earth.
True Or False.
Ibis was created by the bureau of alcohol ,tobacco, firearms and explosives in the United States true or false?
Answer: It is true.
Explanation: Hope it helps! :)
Answer:
false
Explanation:
the correct answer is Forensic Technology, Inc.
Which represents the self ionization of water at 25 degrees
there are two parts of photosynthesis- the light reactions and the dark reactions. what is the end product of the dark reactions
Will Give Brainliest if your correct. ______ are traces of preexisting life, which may exist in the form of shells, bones, or impressions of plant leaves and soft body parts.
A.Rock records
B.Fossils
C.Fauna
D.Flora
Rock records are not an evidence of pre-existing lives.
The flora and fauna constitute the living species of all the plant and animals including the humans. The animal and plant that might have existed long ago can never physically leave evidence in the form of fresh leaves and flesh.
The fossil of the animals and humans and other life forms gives us a clear evidence of what kind of life existed in the years preceding us.
Hence, the correct answer is option B that is fossils.
idk how to do this sos
A book is pushed across the table by a student. The student stops pushing on the book and the book slows down and stops. The force stopping the book is a force known as A) inertia. B) friction. C) the applied force. D) the action-reaction force.
This food chain is incomplete. Two groups of organisms are missing. One group of organisms that is missing are the producers, plants and other photosynthetic organisms. They turn sunlight into chemical energy. What is the other missing group and what do they do? A) Carnivores that eat only meat. B) Herbivores that eat only plants. C) Predators that prey on all other levels of consumers. D) Decomposers that recycle matter back into the food chain.
Answer:
D
Explanation:
USATESPREP
Answer:
D) Decomposers that recycle matter back into the food chain.
Explanation:
Why is potassium iodide electrically neutral?
Give the correct balanced equation for the single replacement reaction of magnesium with aluminum oxide. A) Mg + AlO → MgO + Al B) Mg + Al2O3 → MgO + Al C) 3Mg + Al2O3 → 3MgO + 2Al D) Mg + Al2O3 → MgO3 + Al2
Answer is C
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