Answer:
Chemistry helps in improving the quality of our life, it helps in improving food production, building & construction, military and space science, clothing materials, medicine and transportation.
What 2 tools do we use to measure volume?
Answer:
u
Explanation:
Name the four types of friction. Provide one example not used in your lesson for each type.
Sabendo que os calores de combustão do enxofre monoclínico e do enxofre rômbico são, respectivamente, - 297,2 kJ/mol e - 296,8 kJ/mol, calcule a variação de entalpia na transformação de 1 mol de enxofre rômbico em enxofre monoclínico. S (mon.) + O2(g) SO2(g) ∆H1 = –297,2 kJ/mol S (rômb.) + O2(g) SO2(g) ∆H2 = –296,8 kJ/mol
Responda:
+ 0,9kJ / mol
Explicação:
Dados os calores de combustão do enxofre monoclínico e enxofre rômbico como - 297,2 kJ / mol e - 296,8 kJ / mol, respectivamente para a variação na transformação de 1 mol de enxofre rômbico em enxofre monoclínico conforme mostrado pela equação;
S (mon.) + O2 (g) -> SO2 (g)
Uma vez que são todos 1 mol cada, a mudança na entalpia será expressa como ∆H = ∆H2-∆H1
Dado ∆H2 = -296,8kJ / mol
∆H1 = -297,2kJ / mol
∆H = -296,8 - (- 297,2)
∆H = -296,8 + 297,2
∆H = 297,2-296,8
∆H = + 0,9kJ / mol
Portanto, a mudança na entalpia da equação é + 0,9kJ / mol
How much is one liter
Answer:
1 litre = 1000 millilitres
electrovalent compounds are electrolysed but covalent compounds are not electrolysed, why ?
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In terms of particles, what is the mass number equal to? (The mass is 12)
Answer:
The number of protons plus the number of neutrons
Explanation:
Answer:
The mass number is equal to the total number of protons and neutrons in the nucleus of an atom.
Explanation:
The more gravity pulls down on an object the less the object weighs true or false
false
Explanation:
The more gravity pulls down on an object it gets heavier. Weight is just the amount of force gravity is putting on something. So if gravity is pulling it down more ut would get heavier.
Answer:
False
Explanation:
The move gravity there is pulling on something, the more it'll weigh. The less gravity something or someone has, the less they will weigh. For example, on the moon things weigh less because there is less gravity pulling on objects.
Which element is represented by the following Bohr model? *
p = 11
n 12
Answer:
A sodium atom.
Explanation:
A sodium atom contains 11 protons and 12 neutrons and its mass is 23.
which is heavier Aluminum (Al) or Iron (Fe)
Answer:
iron, it is more dense than aluminum
Explanation:
Answer:
Aluminium
Explanation:
1. How to elements differ from compounds?
Answer:
A compound contains atoms of different elements chemically combined together in a fixed ratio. An element is a pure chemical substance made of same type of atom. ... Elements contain only one type of atom.
Explanation:
Answer:
A compound is just like what it is- a group of atoms put together. A element is made up of only 1 atom.
Explanation:
How are a carrot, an amoeba, and a bacterium alike?
They are all made of cells.
They are eukaryotes.
They are prokaryotes.
They all live in soil.
Answer:
They all are made up of cells
Answer: They are all made of cells.
Explanation:
What is the Causative agent
Syphilis?
Answer:
Explanation:
CAUSATIVE AGENTS. Syphilis is a chronic infectious disease caused by the spirochaete Treponema pallidum.
Tony ran at a constant speed of 10 m/s for a total of 60 seconds. How far did he run?
According to the speed formula, distance that Tony ran at a constant speed of 10 m/s for a total of 60 seconds is 600 meters.
What is speed?The speed (commonly referred to as v) of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.The average speed of an object in an interval of time is the distance traveled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero. Speed is not the same as velocity.
Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second (m/s), but the most common unit of speed in everyday usage is the kilometre per hour (km/h) or, in the US and the UK, miles per hour (mph). For air and marine travel, the knot is commonly used.
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What is commensalism? Give two examples.
Answer:
Commensalism is a relationship between two organisms in which one organism benefits, and the other one is left unaffected.
Examples:
1. Barnacles on a sea turtle
2. Tree frogs and plants (they use them as protection)
1. Barnacles on a sea turtle
2. Tree frogs and plants (they use them as protection)
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True or False: Electrons in each lower level are filled before electrons fill
the higher energy level.*
1. True 2. False
the answer is 1....true
I have a block of gold and the density is 13.54g/ml If I cut the block in half what is the density of the smaller pieces of gold
Answer:
Density is the same
Explanation:
The density remains the same because cutting the object in half will divide the mass & volume by the same amount. Also, the density of a substance remains the same no matter what size it is.
Which statement best describes the movement of Wind?
A. air moves from high pressure to low pressure
B. air moves from high temperature to low temperature
C. air moves from high volume to low volume
Answer:
A. Air moves from high pressure to low pressure
valid experiment for does water and oil mix
Answer: Water and oil cannot mix
Explanation:
Describe yourself based on food
what is the density of an 85.7 g sample of unknown susbstance if the sample occupies 32.4mL
Answer:
m= 85.7g
V= 32.4mL
d= m/V
d= 2.65g/mL
As the temperatures increase density generally ?
A. Increase
B. Decrease
C. Remain same
PLS SOMEONE HELP ME:) this is science class
Answer: v
Explanation: To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.~ Google
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You are on an alien planet where the names for substances and the units of measures are very unfamiliar. Nonetheless, you obtain 40 quibs of a substance called skvarnick. You can trade this skvarnick for gold coins, but the vendors all measure skvarnick in units of sleps; not quibs. 15 quibs is equal to 13 sleps. If you have 40 quibs of skvarnick, how many sleps do you have? Round your answer to the nearest tenth (one decimal place). Type only the number; not the number and unit. Your Answer:
The density of gold is 19.3 g/cm3. What is the mass of 11.3 cm3 of gold? Show your work.
Answer:
218.09g
Explanation:
the formula for density is mass/volume
you have volume so rlly what you have is 19.3g/cm3=m/11.3cm3
so mass equals density x volume
and 19.3 x 11.3 = 218.09
If the half life of Substance A is 0.5 years, how long would it take for 2 grams of substance A to remain given an initial mass of 16 grams?
Time taken is given by :
[tex]t=-\dfrac{1}{k}\dfrac{[A_t]}{[A_o]}[/tex] .......( 1 )
Also,
[tex]k = \dfrac{0.693}{t_{0.5}}\\\\\\k=\dfrac{0.693}{0.5}\\\\k=2\times 0.693\ year^{-1}[/tex]
Putting value of k in equation 1, we get :
[tex]t=\dfrac{1}{2\times 0.693}\times ln(\dfrac{2}{16})\\\\t=1.5\ years[/tex]
Therefore, time taken is 1.5 years.
Hence, this is the required solution.
an object has a mass of 45.0 g and a volume of 4.0 ml. what is its density?
Answer:
The answer is
11.25 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]
From the question
mass = 45 g
volume = 4 mL
Substitute the values into the above formula and solve for the density
We have
[tex]Density = \frac{45}{4} [/tex]
We have the final answer as
11.25 g/mLHope this helps you
Christy is a forensic scientist. She is given a white powder and asked to determine whether it’s sugar. She analyzes the white powder with a mass spectrometer in her lab. The test results reveal that the substance has a different molecular mass than sugar. What do these test results say about the initial hypothesis and what would be a reasonable next step for Christy’s investigation?
Answer:
A. is not
B. incorrect
C. identify substances that have the measured molecular mass
Explanation:
Since in the question it is mentioned that the Christy who is a forensic scientist and she gave a white powder and identify whether it is a sugar or not when she tested she seen that the molecular mass is different as compared with the sugar
So here it can be concluded that the white powder does not show a sugar that means it is not a sugar so automatically the hypothesis of Christy is wrong. And, the next step is to track the substance that shows the molecular mass i.e. measured
Answer:
- is not
-incorrect
- identify substances that have the measured molecular mass
Explanation:
Explain why all models have limitations.
Explanation:
The limitations of model based on Experimental design and parameter
All models have limitations because they simplify complex real-world phenomena, omitting certain details or factors to make them manageable and understandable.
Limitations of modelsAll models have limitations because they are simplified representations of complex systems or phenomena. To make models more manageable and understandable, certain details, variables, or interactions must be excluded.
This simplification can lead to discrepancies between the model and reality, limiting its accuracy and applicability. Additionally, models are often based on existing knowledge, which may be incomplete or subject to change.
As a result, models serve as valuable tools for understanding and prediction but should be used with caution, acknowledging their inherent simplifications and potential shortcomings when applied to real-world scenarios.
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. The stomach, small intestine, and large intestine are all organs. When they work together to process food, they form a functional unit known as -
20 points
an organism
a system
a tissue
a cell
The functional unit is called a system.
The stomach, small intestine, and large intestine are all organs. When they work together to process food, they form a functional unit known as a system. The correct option is b.
What is a body system?The living body performs many functions. These functions are performed by different systems of the body. There are many systems in the body.
These systems are digestive systems, reproductive systems, circulatory systems, etc. These systems run the body and make an organism.
Here, the stomach, small intestine, and large intestine are all organs of the digestive system. Digestive system digest the food that we eat and provides us energy and removes the waste material from the excretory system, which excretes it out of the body.
Thus, the correct option is b. system.
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A piece if stone has a mass of 24.595 grams and a volume of 5.34 cm ^3. What is the density of the stone
Answer:
The answer is
4.61 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass of stone = 24.595 g
volume = 5.34 cm³
The density of the stone is
[tex]density = \frac{24.595}{5.34} \\ = 4.605805243...[/tex]
We have the final answer as
4.61 g/cm³Hope this helps you
