Over 30 species of dinosaur fossils with feathers have been discovered. Therefore, birds evolved from dinosaurs.
A.) Claim
B.) Evidence
C.) Reasoning
In the reaction 2Li(s) + 2H2O(I) -> 2LiOH(aq) + H2(g), which compound is in the aqueous state?
A. Li
B. H2O
C. LiOH
B. H2
The substance that is in aqueous state in the reaction is LiOH from the equation shown.
What is an aqueous state?An aqueous state is a state in which a substance is dissolved in water. This implies that the substance is in solution.
Thus, the substance that is in aqueous state in the reaction is LiOH from the equation shown.
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Answer:
C
Explanation:
Make the following conversion.
60 dkm = _____ km
6,000
0.060
60,000
0.60
Answer:
0.6
Explanation:
A cylinder at left with balls evenly spaced throughout the cylinder with an arrow leading to a cylinder at right with balls stacked near the bottom of the cylinder.
Which change of state is shown in the model?
condensation
deposition
boiling
freezing
Answer:
condensation
Explanation:
The state of change shown in the diagram is a condensation process. During condensation, heat is removed from vapor or gases and then they aggregate back to the liquid state.
The image to the left is that of a typical gas molecule. To the right we have a liquid where the particles have aggregated In going from a gas to liquid, the phase change is a condensation reaction. This is a form of physical change.Answer:
Use these images to identify each state of matter.
A cylinder at left labeled A contains balls widely separated in space. A cylinder in the center labeled B contains balls stacked near the bottom of the cylinder. A cylinder at right labeled C contains balls in a layer along the bottom of the cylinder.
Match each image with the correct state of matter.
A:
gas
B:
solid
C:
liquid
Explanation: i got it right trust me
what is the gel-like part of the eye?
Answer:
vitreous
Explination:
The vitreous is the gel-like fluid that fills your eye. It's full of tiny fibers that attach to your retina (the light-sensitive layer of tissue at the back of the eye). As you get older, the fibers of your vitreous pull away from the retina.
Answer:
The vitreous
Explanation:
Melting chocolate (a change of state) is an example of a
When heated, calcium carbonate decomposes according to the equation given below:
CaCO3 --> CaO + CO2
If 50.0 g of CaCO3 react but only 20.0 g of CO2 are recovered, what is the percent yield of this reaction?
90.9%
40.0%
66.7%
250%
Answer:
Percent yield = 90.9%
Explanation:
Given data:
Mass of CaCO₃ = 50.0 g
Mass of CO₂ produced = 20.0 g
Percent yield = ?
Solution:
Chemical equation:
CaCO₃ → CaO + CO₂
Number of moles of CaCO₃:
Number of moles = mass/molar mass
Number of moles = 50.0 g/ 100.1 g/mol
Number of moles = 0.5 mol
Now we will compare the moles of CO₂ with CaCO₃.
CaCO₃ : CO₂
1 : 1
0.5 : 0.5
Mass of CO₂: Theoretical yield
Mass = number of moles × molar mass
Mass = 0.5 mol × 44 g/mol
Mass = 22 g
Percent yield:
Percent yield = ( actual yield / theoretical yield ) × 100
Percent yield = (20.0 g/ 22.0 g) × 100
Percent yield = 0.909 × 100
Percent yield = 90.9%
What is a scientific model? How is a scientific model helpful to the brain for relaying a scientific
concept?
Answer: A scientific model is a physical and mathematical and conceptual representation of a system of ideas, events or processes.
ANd also for your second question i dont know what you mean?
Explanation:
Scientists work to recognize and comprehend patterns in our world by applying their scientific expertise to provide predictions about the patterns.
What is the main purpose of scientific model?In a range of scientific specialties, from chemistry and physics to biology and the Earth sciences, research models are employed to explain and forecast the behavior of real things or systems. The ability to depict things that are too little or enormous, explain either past or present, and forecast the future are all advantages of employing model beyond nature.
Why are scientific models important?Models can help you visualize something is difficult to see or understand. Models can help in scientific predictions, process comprehension, and concept communication. Because it frequently includes a variety of hypotheses or facts, an evolutionary theory varies from other general explanations. A science simulation may be used to verify a scientific theory or to demonstrate a scientific model.
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A sample of 5.0 g of hydrogen gas reacts with 5.0 g of oxygen gas.
2H2(g) + O2(g) > 2H2O
Please answer the questions in a b c d and e, or at least in any of the ones you know. Thank you.
The percent yield of the reaction has been 74.47%.
The balanced chemical equation for the reaction has been:
[tex]\rm 2\;H_2\;+\;O_2\;\rightarrow\;2\;H_2O[/tex]
(a) The theoretical yield can be calculated as:
The theoretical yield of water has been:
1 mole of oxygen produces = 2 moles of water
0.1562 moles of oxygen produces = 0.1562 [tex]\times[/tex] 2
= 0.312 moles of water.
The mass of water has been = moles [tex]\times[/tex] molecular weight
The theoretical yield of water = 0.312 [tex]\times[/tex] 18 grams
The theoretical yield of water = 5.616 grams.
(b) The limiting reactant has been the one whose concentration has been in a lesser quantity for the complete utilization of other reactants.
According to the reaction, for the complete utilization of 2 moles of Hydrogen, 1 mole of oxygen has been used.
The moles of 5 grams Hydrogen:
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
Moles of hydrogen = [tex]\rm \dfrac{5}{1}[/tex]
Moles of hydrogen = 5 mol.
Moles of Oxygen = [tex]\rm \dfrac{5}{32}[/tex]
Moles of oxygen = 0.1562 mol.
For the complete utilization of 5 moles of hydrogen 2.5 moles of oxygen has been required.
Since the oxygen has been present in a lesser quantity, the oxygen has been the limiting reactant.
(c) The consumption of 0.1562 moles of Oxygen has required 0.312 mol of Hydrogen. The hydrogen has been present in a higher quantity than required.
Thus. hydrogen has been the excess reactant.
(d) The remained excess reactant has been:
Remained = Total - consumed
Remained = 5 - 0.312
Remained = 4.68 mol.
The excess reactant has been 4.68 mol extra than required.
(e) The theoretical yield of water has been:
1 mole of oxygen produces = 2 moles of water
0.1562 moles of oxygen produces = 0.1562 [tex]\times[/tex] 2
= 0.312 moles of water.
The mass of water has been = moles [tex]\times[/tex] molecular weight
The theoretical yield of water = 0.312 [tex]\times[/tex] 18 grams
The theoretical yield of water = 5.616 grams.
The actual yield of water has been 4.2 grams.
The percent yield of water = [tex]\rm \dfrac{Actual\;yield}{Theoretical\;yield}\;\times\;100[/tex]
The percent yield of water = [tex]\rm \dfrac{4.2}{5.616}\;\times\;100[/tex]
The percent yield of water = 74.74 %
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Answer:
a- 5.616
b- Oxygen
c- hydrogen
d- 4.68 extra
e- 74.47%
I hope this helps! Cheers ^^
Out of magnesium, iron, calcium, mercury, copper, or aluminum which metal would be the most useful when transporting acids or water solutions? PLEASE HELP!!! Thank you
Will give 50 points, If a decrease in temperature accompanies a reaction, what occurred?
Energy was released.
Energy was destroyed.
Energy was created.
Energy was absorbed.
Answer:
A.
Explanation:
1.How far can you travel if you drive 4 hours and can average 120 Km/hr?
a.30 Km
b.480 Km
c.80 Km
Answer:
B
Explanation:
D=S×T
=120km/h×4hrs
=480km
Answer:
the answer is b
Explanation:
this is the answer :)
When water is solid, do molecules move?
Answer:
Ice is water in its solid form. Ice keeps its shape, even if it's removed from the container. The molecules in ice are locked into place and cannot move or slide past one another, but they do vibrate a little bit.
Explanation:
As the temperature drops or decreases, the water molecules gradually slow down. Eventually they stop moving and simply vibrate back and forth. At this point ice is formed, the solid phase of water. If the temperature is allowed to increase, the molecules will once again begin to vibrate faster and faster.
Answer:Ice is water in its solid form. Ice keeps its shape, even if it's removed from the container. The molecules in ice are locked into place and cannot move or slide past one another, but they do vibrate a little bit.
Explanation:
What factors do you think should be considered in selecting a metal to use to reclaim copper? Which factor do you think is the most important? Explain.
Answer:
Aluminum
Explanation:
Aluminum would be the best choice to reuse copper from the copper chloride solution because it In the aluminum–copper reaction, the chloride ions help remove the aluminum oxide coating so that a reaction can take place through the oxidation of aluminum and the reduction of copper ions.The aluminum–copper chloride reaction is a simplified version of a waste reclamation and reduction strategy for handling toxic-waste materials.High percent yield generally indicates a carefully run experiment.
O True
False
in my opinion it's true!!!
How do mammals protect their young?
Answer:
Explanation:
Baby pigs, dolphins, bats and elephants all drink milk! Because the babies rely on their mother's milk to live, the mammal mommies have to care for their young. ... Through copying their mothers, baby mammals learn everything they need to survive
Answer:
by be young
Explanation:
wow just use you brain
I have similar chemical and physical properties to calcium but my molecular mass is lower, what element am I?
-Potassium
-Scandium
-Magnesium
-Strontium
Compare the elements: Sn, Sb, Te, and I:
Which has the lowest ionization energy?
Why?
Answer:
Sn
Explanation:
Tin, Sn, will have the lowest ionization energy from the given choices.
Sn is an element is the fourth group on the periodic table.
Ionization energy is a measure of the readiness of an atom to lose an electron. The lower the value, the easier it is for an atom to want to lose an electron and vice versa.
Across a period, I.E increases progressively from left to right due to the decreasing atomic radii caused by the increasing nuclear charge which is not compensated for by successive electronic shells.
Sn, Sb, Te and I are all in the 5th period.
Metal oxides are in which state?
Answer:
Metal oxides are crystalline solids that contain a metal cation and an oxide anion. They typically react with water to form bases or with acids to form salts.
Explanation:
Hope this helps!
baking soda and vinegar lab demo part 2 mass! 7th grade please help!
Answer:
just watch the video, what does it start with, write that down for each trial, then what does it end with, then starting mass - ending mass is the change mass
Is this true Bc I’m not sure
Answer:
????? questions there no question
Answer:
what
Explanation:
how many atoms are there in a 1 mol sample of water
Answer:
Explanation:
1 molecule has 2 hydrogens and 1 oxygen. That's 3 atoms.
1 mol of anything is 6.02 * 10^23 items. There are 3 atoms in 1 molecule
There are 6.02*10^23 * 3 atoms in a mol of water
Answer: 1.804 * 10^24 atoms in a mol of water.
Mark & Sally were in lab and they were working on a chemical reactions experiment. They mixed 2 liquids together and a white sold color appeared. What can Mark & Sally conclude as their observation?
A chemical change
B physical change
Answer:
A chemical change
Explanation:
From the observation, a chemical change has ensued.
A chemical change is one in which new kind of matter is formed. It is always accompanied by energy changes . This process is not easily reversible.
This process depicted by Mark and Sally is chemical change. This reaction is a precipitation reaction since an insoluble solid has been formed. In chemical changes the process is not reversible.If you have 1.26 x 1024 molecules, how many moles do you have?
Answer:
2.09 moles
Explanation:
1 mole=6.022*10^23 moles --> 1.26×10^(24)/(6.022*10^23)=2.09 moles
GIVING BRAINLY
this equation describes a chemical reaction : aluminum + iron oxide → aluminum oxide + iron
Which of the following statements about the chemical equation is true? * view attachment for answer choices*
Answer:
C. Iron oxide is a mixture of iron and oxygen
A 2.0 sample of N2 occupy 50.0L at 15 degrees Celsius and 640mmHg. What volume will the gas occupy at 45 degrees Celsius and 160mmHg?
Answer:
220.8L
Explanation:
Given parameters:
Initial volume = 50L
Initial temperature = 15°C = 288K
Initial pressure = 640mmHg
Final temperature = 45°C = 318K
Final pressure = 160mmHg
Unknown:
Final volume = ?
Solution:
Using the combined law;
[tex]\frac{p_{1}v_{1} }{T_{1} }[/tex] = [tex]\frac{p_{2}v_{2} }{T_{2} }[/tex]
p,v and T are pressure, volume and Temperature
[tex]\frac{640 x 50}{288}[/tex] = [tex]\frac{160 x v_{2} }{318}[/tex]
160 x 288 x v₂ = 640 x 50 x 318
v₂ = 220.8L
HELP ME PLEASE!!
Density (D) is defined by mass/volume .
Which item increases as heat is applied?
D
m
V
Answer:
volume
Explanation:
things expand when heat is applied taking up more space hence volume
HELP!!
H2SO4 is _____.
a base
an acid
a neutral
(The 2 is small and so is 4)
Answer:
Acid
Explanation:
acid
Answer:
An acid
Explanation:
H2OSO4 is Sulfuric Acid
A solution has a pH of 2. Which best describes the solution? A strong acid, a strong base, a neutral solution, a weak base
Answer:
The best solution is Strong acid
Explanation:
add me on snap Andy142512
A solution that has a pH of 2 is a strong acid solution.
Explanation:
The pH of the solution is defined as the negative logarithm of the hydrogen ions concentration in an aqueous solution.[tex]pH=-\log[H^+][/tex]
If the pH of the solution is less than 7 is said to be an acidic solution.If the pH of the solution is equal to 7 is said to be a neutral solution.If the pH of the solution is greater than 7 is said to be an alkaline solution.So, from this, we can conclude that solution with a pH of 2 which is less than 7, hence strong acidic solution.
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Need Help ASAP
Calculate the pH of:
a) 0.1 M HF Ka = 7.2 x 10-4
b) 1 x 10-3 M HNO3
c) 1 x 10-8 M HCl
a. pH=2.07
b. pH=3
c. pH=8
Further explanationpH=-log [H⁺]
a) 0.1 M HF Ka = 7.2 x 10⁻⁴
HF= weak acid
[tex]\tt [H^+]=\sqrt{Ka.M}\\\\(H^+]=\sqrt{7.2.10^{-4}\times 0.1}\\\\(H^+]=8.5\times 10^{-3}\\\\pH=3-log~8.5=2.07[/tex]
b) 1 x 10⁻³ M HNO₃
HNO₃ = strong acid
[tex]\tt pH=-log[1\times 10^{-3}]=3[/tex]
c) 1 x 10⁻⁸ M HCl
[tex]\tt pH=-log[1\times 10^{-8}]=8[/tex]