Explanation:
Using the Law of Conservation of mass,the mass of the reactants should be equal to the mass of the products after the reaction.
In the 17th century, British biologist Robert Hooke discovered the cell. A little more than a century later, French botanist René Henri Dutrochet concluded that all living things arise from cells, and all cells are derived from other cells. Dutrochet's proposal indicates that —
A
cells are the highest level of organization in a living organism.
B
cells are not a level of organization in a living organism.
C
cells alternate between being the highest and lowest level of organization in a living organism.
D
cells are the lowest level of organization in a living organism.
Answer: A
Explanation:
Robert Hooke discovered the cell. Cells are the highest level of organization in a living organism. so, option A is correct.
What is cell ?Cell is the smallest unit that can sustain life on its own and makes up all living things, including the body's tissues. It is a small unit of organism containing nucleus.
The cell membrane, the nucleus, and the cytoplasm are the three primary components of a cell. The cell membrane encloses the cell and regulates how substances enter and exit the cell.
After using a very early microscope to examine a piece of cork, Robert Hooke proposed the name "cell" in 1665, derived from the Latin cella, which means "storeroom or chamber." It is also claimed that he believed the rectangular chambers to resemble some monastic cells.
Thus, option A is correct.
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what I do when I need to eat
what happens to a rock that has rainwater entering its cracks and then freezing
Answer:
Physical weathering is caused by the effects of changing temperature on rocks, causing the rock to break apart.
Explanation:
Freeze-thaw occurs when water continually seeps into cracks, freezes and expands, eventually breaking the rock apart.
Ratio of hydrogen chloride
Answer:
Each molecule of HCl is composed of a one-to-one ratio of hydrogen and chlorine.
Explanation:
Why do scientists look for patterns in the world?
A. Patterns never change, no matter what.
B. Patterns can help explain observations.
O C. Patterns are easy for scientists to detect.
D. Patterns are all the same, through all time.
Answer:
B. Patterns can help explain observations.
Explanation:
Hope this helps
Answer:
B. Patterns can help explain observations.
Explanation:
a p e x 2021 :) Have a nice day everyone!
Why are human-powered generators the best energy source for the rescue team?
Answer:
Human powered generators are the best energy source for the rescue team as it doesn't require any lengthy time consuming resource but only the power of single human being. Just like fossil fuels, the human power is a kind of renewable energy source that does no harm to the environment and can be used whenever required.
Explanation:
I hope that helped.
I have snap chat if you need it.
Let me know if you need help with anything else.
Human powered generators are the best energy source for the rescue team because it doesn't require any lengthy time consuming resource but only the power of single human being.
why the Human-powered generators are the best energy source for the rescue team?Human powered generators are the best energy source for the rescue team because it doesn't require any lengthy time consuming resource but only the power of single human being. Just like the fossil fuels, human power is a kind of renewable energy source that does no harm to the environment and can be used whenever required.
The Rescue missions take place in day and night and as well in a different environment, which could be rainy or cloudy
Human-powered generators can be used to transfer energy into a battery at any time (rainy or sunny, night or day) someone is there to turn the crank.
Hence, it can be concluded that Human-Powered generators are the most reliable and the best for rescue teams.
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What is the chemical formula for tetraiodine heptafluoride?
Answer:
Tetra iodine nonoxide (I₄O₉) IF₇
Explanation:
Tetraiodine nonoxide (I4O9) was formulated but not thoroughly researched for the gas-phase combination of I2 with O3. The chemical substance is iodine pentoxide with either the equation I2O5. The anhydride of iodic acids and the only secure oxide of iodine however is iodine oxide.
________ is a trend making computers ubiquitous?
Answer:
Pervasive computing, also called ubiquitous computing, is the growing trend of embedding computational capability (generally in the form of microprocessors) into everyday objects to make them effectively communicate and perform useful tasks in a way that minimizes the end user's need to interact with computers as ...
Explanation:
What do you suppose is the reason and what do you need to do.
Answer:
You have to add many things
Explanation:
for example u can add why and how also what ur point is
What is the difference between A and B? In your answer, describe the state of matter in each picture AND the key property of gas being shown.
For A it seems that the molecules are freely moving around and vibrating as well- indicates liquid. At B, the molecules are rigid with very less energy - indicating solid.
A pumpkin has a volume of 10 cm3 and a mass of 8g. What is the density of the pumpkin
Answer:
Volume (v) = 10 cm^3
Mass (m) = 8g = 8/1000 kg = 0.008 (SI unit of mass is kg)
Density (D) = ?
Now,
D = m/v = 0.008/10 = 0.0008
Which describes a characteristic of quartzite? Don't check all that apply.
igneous
foliated
does not split into layers
grains arranged in parallel layers
Answer:
the answer is " does not split into layers"
Explanation:
Quartzite is a non-foliated metamorphic rock and non-foliated rocks have their mineral grains arranged randomly.
HOW DO ELECTROSTATIC FORCES GUIDE THE SHAPE OF A MOLECULE?
If Brian and his scooter had a mass of 50 kg, how much force would it take for him to accelerate at 0.8 m/s2
Answer:
The answer is 40 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × accelerationFrom the question
mass = 50 kg
acceleration = 0.8 m/s²
We have
Force = 50 × 0.8
We have the final answer as
40 NHope this helps you
Which statement best explains why heating a liquid affects its viscosity?
The molecules move faster at higher temperatures and overcome attractions more easily.
The molecules move faster at higher temperatures, and the attractions between them increase.
The molecules move slower at higher temperatures and overcome attractions more easily.
The molecules move slower at higher temperatures, and the attractions between them decrease.
Answer: The molecules move faster at higher temperatures and overcome attractions move easily.
Explanation: edgen. 2020
Answer:
It's A !
The molecules move faster at higher temperatures and overcome attractions more easily.
In a synthesis reaction, the elements Fe and S might react to form which of the following?
A. H20
B. FeS
C. Na and Cl
D. All of the above
Answer:
THE ANSWER IS A
Explanation:
In a synthesis reaction, the elements Fe and S might react to form FeS.
Given :
The elements Fe and S might react to form a product,
To find:
The product of the synthesis reaction.
Solution:
The synthesis reaction is a type of chemical reaction in which two more different substances are combined together to give a single product,
When iron (Fe) and sulfur react the product will be formed will have both iron atoms and sulfur atoms.
[tex]Fe+S \rightarrow FeS[/tex]
In a synthesis reaction, the elements Fe and S might react to form FeS.
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what piece of equipment changes the signal from the television camera into an electric signal?
Answer:
The transponder
Explanation:
Answer:
Transducer
Explanation:
Transponder was incorrect and made me lose points on the test.
If you have six molecules of CO2how many oxygen atoms do you have?
Which atom has only one pair of electrons in its outermost energy level?
a. Boron b. carbon c. nitrogen d. oxygen
Answer:
i belive A, i cold be wrong tho, pls tell me if im right if you fully find out
ght. Explanation:
What substances make up an iron pot
Answer:
Iron
Explanation:
Gravity would cause the rain falling in which two locations to drain into the area B
Answer:
4 and 3
because i guessed
Gravity would cause the rain falling in (3) and (4) locations to drain into area B. thus these locations are most near to basin area B.
How does gravity affect rainfall?Through watersheds, gravity forces water to flow down on the land and precipitation to fall from clouds. The constant circulation of water between these reservoirs is powered by gravity and solar energy. The water turns from a liquid to a gas as it becomes hotter.
Rainfall can be significantly influenced by mountains. Air must rise to overcome this obstruction once it reaches the mountains. A mountain's windward side causes the air to cool and lose volume as it ascends. As a result, humidity rises, and precipitation and orographic clouds may form.
The image is attached below.
Therefore, these locations are most near basin area B.
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The given question is incomplete, so the most probable complete question is attached in the image.
If it takes a Sonar echo 8 seconds to reach the bottom of the ocean and return and we know that the speed of sound is 1500 meters per second, how far away is the bottom of the ocean?:
A) 4000 meters
B) 8000 meters
C) 6000 meters
D) 1200 meters
Answer:
C) 6000 meters.
Explanation:
Hello.
In this case, since the speed is computed as the distance divided by the time to attain such displacement:
[tex]s=\frac{d}{t}[/tex]
Knowing that the speed is 1500 m/s and the required time is 4 s because is the half of the described travel, the distance is then:
[tex]d=s*t\\\\d=1500m/s*4s\\\\d=6000m[/tex]
Therefore, the answer is C) 6000 meters.
Best regards.
Answer:
600 meters i took test ;)
Explanation:
What law do we use to balance chemical equations? What does that law say?
Answer:
Hello
Law of conservation of mass
The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction.
Explanation:
How are the molecules in a substance behaving if a great deal of thermal energy has transferred away from it through conduction?
Answer:
the molecules would be slowing down
Explanation:
Answer:
they'd slow down durr
Explanation:
how many grams of S are in 665 g of SO2
Answer: 111g S
Explanation:
SO2 you have = 665 g
SO2 molar mass = 64.066 g/mol
S molar mass = 32.065 g/mol
[tex]665g SO2*\frac{1 molSO2}{64.066gSO2} *\frac{1molS}{3molSO2} * \frac{32.065gS}{1molS} = 110.944... ~ 111gS[/tex]
There are 332.5 grams of S (sulfur) in 665 g of SO2 ( sulfur dioxide).
From the information given:
The atomic mass of sulfur = 32 g/mol
The atomic mass of oxygen = 16 g/mol
∴
The molar mass for SO2 = 32 + (16 × 2) g/molThe molar mass for SO2 = 64 g/molSince there are 665g of SO2;
If 1 mole of SO2 contains 1 mole of S
It implies that:
(1 × 64)g of SO2 will contain (1 × 32) g of S;
∴
665 g of SO2 will contain :
[tex]\mathbf{= \Big ( \dfrac{1 \times 32}{1 \times 64} \times 665 \Big )}[/tex]
= [tex]\mathbf{\Big 332.5 \ grams \ of \ S \Big}[/tex]
Therefore, we can conclude that there are 332.5 grams of S present in 665 g of SO2.
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The energy change in an endothermic reaction is:
A. Internal
B. Positive
C. External
D. Negative
Thank you so much for helping !
The energy change in an endothermic reaction is internal. Hence, option A is correct.
What is an endothermic reaction?Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
A reaction or process in which heat is transferred to a system from its surroundings is endothermic.
The first law of thermodynamics states that the energy of the universe is constant.
The change in the internal energy of a system is the sum of the heat transferred and the work done.
Hence, option A is correct.
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Which of the following would be the
best tool to use when heating substances
for experiments?
A cardboard boxes
B. plastic beakers
C plastic test tubes
D. glass beakers
If you start using 10.0 grams of NaHCO3 and excess of acetic acid, how many moles of CO2 can be formed? How many grams of CO2 can be formed?
Answer:
[tex]n_{CO_2}=0.119molCO_2[/tex]
[tex]m_{CO_2}=5.24gCO_2[/tex]
Explanation:
Hello.
In this case, since the chemical reaction:
[tex]NaHCO_3+CH_3COOH\rightarrow CH_3COONa+H_2O+CO_2[/tex]
And 10.0 grams of sodium bicarbonate (molar mass = 84 g/mol) are reacting in a 1:1 mole ratio with the yielded carbon dioxide, those moles and grams turn out:
[tex]n_{CO_2}=10.0gNaHCO_3*\frac{1molNaHCO_3}{84gNaHCO_3} *\frac{1molCO_2}{1molNaHCO_3} =0.119molCO_2[/tex]
And the mass by considering the molar mass of carbon dioxide to be 44 g/mol:
[tex]m_{CO_2}=0.119molCO_2*\frac{44gCO_2}{1molCO_2} \\\\m_{CO_2}=5.24gCO_2[/tex]
Best regards.
If you start using 10.0 grams of sodium bicarbonate and excess of acetic acid, you can obtain 0.119 moles of CO₂ (5.24 g).
Let's consider the following neutralization reaction.
NaHCO₃ + CH₃COOH ⇒ CH₃COONa + H₂O + CO₂
First, we will convert 10.0 g of NaHCO₃ to moles using its molar mass (84.01 g/mol).
[tex]10.0 g \times \frac{1mol}{84.01g} = 0.119mol[/tex]
The molar ratio of NaHCO₃ to CO₂ is 1:1. The moles of CO₂ formed from 0.119 moles of NaHCO₃ are:
[tex]0.119 mol NaHCO_3 \times \frac{1molCO_2}{1molNaHCO_3} = 0.119 moles CO_2[/tex]
Finally, we will convert 0.119 moles of CO₂ to grams using its molar mass (44.01 g/mol).
[tex]0.119 mol \times \frac{44.01g}{mol} = 5.24 g[/tex]
If you start using 10.0 grams of sodium bicarbonate and excess of acetic acid, you can obtain 0.119 moles of CO₂ (5.24 g).
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Antonio and his friend found a piece of metal which they want to identify. Here is what they figure out so far: Mass of this metal is 20g Volume of this metal is 2.35cm3
Answer:
The density of beryllium copper is 8.5 g/cm³ thus given metal is beryllium copper.
Explanation:
Given data:
Mass of metal = 20 g
Volume of metal = 2.35 cm³
Which metal is this = ?
Solution:
we will apply density formula to solve this problem.
d = m/v
d = density
m = mass
v = volume
d = 20 g/ 2.35 cm³
d = 8.5 g/cm³
The density of beryllium copper is 8.5 g/cm³ thus given metal is beryllium copper.
A hydrated sample weighing 20.0 g is heated in a crucible at 250°C. After cooling the sample now has a weight of 16.5 g.
What is the weight of the water lost from the sample? ______________
If the % water in the sample = g waterg of original sample x 100, what is the % water in the sample?
Given parameters:
Weight of hydrated sample = 20g
Temperature = 250°C
Weight after cooling = 16.5g
Unknown:
Weight of water lost from the sample = ?
Solution:
The weight of water lost from the sample;
Weight of water lost = Weight of hydrated sample - Weight of dry sample
Weight of water lost = 20g - 16.5g = 3.5g
% of water in the sample = [tex]\frac{mass of water}{mass of original sample} x 100[/tex]
Input parameters solve;
= [tex]\frac{3.5}{20} x 100[/tex]
=17.5%