(5 x 10-21) - (4 x 10-22)
Answer:
29 and 18
Explanation:
Answer:
11
Explanation:
5×10-21 = 29
4×10-22 = 18
29 - 18 = 11
How did boyle's change the way scientists make discoveries
Robert Boyle established chemistry as a discipline based on measurement, freeing it from the mysticism and alchemy that had plagued it. He introduced the concept of chemical analysis and defined elements, compounds, and mixes.
Boyle used a vacuum chamber to alter the gas's pressure in order to find the link between pressure and volume in a gas, which is now known as Boyle's law. In order to demonstrate that pressure and volume are inversely related to one another, he made detailed observations and carried out a number of experiments.
He developed a new vacuum pump and performed experiments in vacuum, they found that neither sound nor flame could exist there.
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Dr. Thomas was doing laundry and accidentally knocked over the entire bottle of liquid laundry detergent (true story!). What would be the best substance to use to help clean up the spill?
Group of answer choices
(Hint) Detergent is a base.
A) lemon juice
B) bleach
C) baking soda
D) water
A.S.A.P
in which of the following does the land being moved contin approximately 60% water
Answer:
C
Explanation:
The answer is C because only that amount can move
PLEASE HELP:
Which of the following would go in the center circle if you were making a web outline about pollution?
Carbon emissions
Causes of pollution
Nuclear waste
Oil spills
Answer:
Oil spills
Explanation:
I've done it before
What causes warm air to rise?
a. The fact that it's less dense than cold air.
b. The fact that it weighs more than cold air.
c. The fact that it has higher pressure than cold air.
d. The fact that it's more dense than cold air.
PLSSS HELPPPPPPPP. I will give brainliest
is CuO a covalent or ionic bond?
The electronegativity difference is less than 1.7, which would make it a covalent bond. But I am still not sure..
Answer:
Ionic bond
Explanation:
Covalent bonds can only form between non-metals and copper is a metal so it would be an ionic bond.
CuO (copper(II) oxide) is a compound with a covalent bond. The electronegativity difference is less than 1.7, which would make it a covalent bond.
In a covalent bond, atoms share electrons to form a stable molecule. The electronegativity difference between copper (Cu) and oxygen (O) is less than 1.7, indicating a nonpolar covalent bond. This means that the electrons in the bond are shared relatively equally between the copper and oxygen atoms, resulting in a molecule with a low degree of polarity.
Copper is a transition metal with an electronegativity of around 1.9, and oxygen has an electronegativity of approximately 3.44. The electronegativity difference (3.44 - 1.9 = 1.54) is less than 1.7, confirming that the bond between copper and oxygen is covalent rather than ionic.
In ionic bonds, the electronegativity difference is typically larger than 1.7, leading to a transfer of electrons from one atom to another, resulting in the formation of ions. Since the electronegativity difference in CuO is less than 1.7, it is considered a covalent bond.
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C2H6(g) + O2(g) → CO2(g) + H2O(g)
Answer:
2C2H6 + 7O2 --> 4CO2 + 6H20
Explanation:
Balanced equation
"Is air pollution related to lichen growth?"
What is a likely hypothesis for the question?
A. Air pollution must affect lichen growth.
B. No, air pollution does not affect lichen growth.
C. If air pollution is high, then lichen growth is high.
D. If air pollution is high, then lung disorder cases are high.
Air pollution must affect lichen growth because lichens have no roots they get all their nutrients from the air. If the air has pollutants that can become toxic for lichens.
What are lichens?A lichen can be described as a composite organism that arises from algae or cyanobacteria living among filaments of fungi species in a mutualistic relationship. Lichens have different properties that come in many colors, sizes, and forms.
A macro lichen can be defined as a lichen that is either bush-like or leafy. Lichens do not have roots therefore they absorb water and nutrients as plants do but like plants, they form their own nutrition by photosynthesis.
If lichens are exposed to air pollutants they are unable to avoid the accumulation of air pollutants. Because lichens possess no roots, their primary source of most nutrients is the air.
Lichen decline can be because of the accumulation of toxic substances as well as altered nutrient supplies that favor one symbiont over the other. Therefore, option (A) is correct.
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how many grams of H2O are in 3.00 moles of H2O?
Answer:
mole=mass/molarmass
Explanation:
molar mass of h2o=18
how many number of atoms does these have?
Answer:
Explanation:
16. 12
17. 8
18. 9
19. 10
20. 5
21. 15
22.8
23. 24
24. 12
25. 3 i guess( some one comment for 25th pls)
26. 2
Which of the following is not part of our climate system?
O atmosphere
O cities
O biosphere
O oceans
Which of these industrial processes typically involves electrolysis?
purifying water for drinking purposes
purifying copper to produce copper wiring for homes
neutralizing an acidic solution by adding a base
neutralizing a basic solution by adding an acid
Answer:
purifying copper to produce copper wiring for homes
Explanation:
Answer:
b.purifying copper to produce copper wiring for homes
Explanation:
The sun’s mass is about 30 million times greater than the moon. Why does the gravitational pull between Earth and the moon affect Earth’s tides more than the gravitational pull between Earth and the sun? a The moon is denser than the sun. b The moon is closer to Earth than the sun. c The moon has phases, but the sun does not. d The moon orbits Earth, but the sun does not.
Answer:
The moon is closer to earth
Explanation:
Around each new moon and full moon, the sun, Earth, and moon arrange themselves more or less along a line in space. Then the pull on the tides increases, because the gravity of the sun reinforces the moon's gravity. ... Thus, at new moon or full moon, the tide's range is at its maximum.
How many do each element are present in the following formula? 3 Ca3 (PO4)2 + 4 CaO
I really need help plz help if you can!!!!!
3 Ca3 (PO4)2 + 4 CaO
So we can see that there are 3 Ca3 (Ca3, Ca3, Ca3), which means you multiply the subscript by the coefficient, meaning 9 Ca. Then we see (PO4)2, which means that there are two PO4 (PO4, PO4) so we multiply the subscript 2 by the subscript 4 on O to equal 8 O, and we multiply the subscript 2 by the subscript 1 on P (the 1 is not written) to equal 2 P.
So far we have 9 Ca, 8 O, and 2 P.
One last term, 4 CaO (means CaO, CaO, CaO, CaO) which translates to 4 Ca and 4 O.
Add them all together and you get (9+4=13) 13 Ca, (8+4=12) 12 O, and 2 P
(Please Help)
when adding a coefficient to a molecule what must you do to all atoms of that molecule?
A.Only multiple the first atom of the coefficient
B. multiply all of the atoms by the coefficient
C. Add the coefficient and the subscripts together, then divide them all by 2.
Answer:
B
Explanation:
Trust me I've had problems like these
True or false: the moon is the same size as the sun.
Answer:
false
Explanation:
NEED HELP ASAP!!!!
A gas occupies a volume of 560 cm at a temperature of 120 °C. To what temperature
must the gas be lowered if it is to occupy 400 cm?
Answer:
7.56°C is the temperature when the gas occupies 400cm³
Explanation:
Based on Charles's law, the volume of a gas is directly proportional to its absolute temperature under constant pressure. The equation is:
V₁T₂ = V₂T₁
Where V is volume and T is absolute temperature of 1, initial state and 2, final state of the gas.
Computing the values:
V₁ = 560cm³
T₂ = ?
V₂ = 400cm³
T₁ = 120°C + 273.15 = 393.15K
560cm³*T₂ = 400cm³*393.15K
T₂ = 280.71K - 273.15 =
7.56°C is the temperature when the gas occupies 400cm³If a balloon has a volume of 45.0 L and a temperature of 298 K and the temperature is increased to 328 K, what will be the new volume of the balloon?
Answer:
2
Explanation:
Ed. 2020
please help me need it fast
Answer:
Do you need 3 ways or just one?
1. Temperature.
2. Pressure.
3. Polarity.
Explanation:
Eh hope these help, Idr understand the question but those are 3 ways to increase the solubility of a solid in water.
For the reaction magnesium plus hyrdogen chloride yeilds hydrogen and magnesium chloride, calculate the percent yield of magnesium chloride if 100. G of magnesium react with excess hydrochloric acid to yield 330. G of magnesium chloride
Answer:
Percentage yield of MgCl₂ = 83.4%
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
Mg + 2HCl —> MgCl₂ + H₂
Next we shall determine the mass of of Mg that reacted and the mass of MgCl₂ produced from the balanced equation. This can be obtained as follow:
Molar mass of Mg = 24 g/mol
Mass of Mg from the balanced equation = 1 × 24 = 24 g
Molar mass of MgCl₂ = 24 + (35.5×2)
= 24 + 71
= 95 g/mol
Mass of MgCl₂ from the balanced equation = 1 × 95 = 95 g
SUMMARY:
From the balanced equation above,
24 g of Mg reacted to produce 95 g of MgCl₂.
Next, we shall determine the theoretical yield of MgCl₂. This can be obtained as follow:
From the balanced equation above,
24 g of Mg reacted to produce 95 g of MgCl₂.
Therefore, 100 g of Mg will react to produce = (100 × 95)/24 = 395.83 g of MgCl₂.
Thus, the theoretical yield of MgCl₂ is 395.83 g
Finally, we shall determine the percentage yield of MgCl₂. This can be obtained as follow:
Actual yield of MgCl₂ = 330 g
Theoretical yield of MgCl₂ = 395.83 g
Percentage yield of MgCl₂ =?
Percentage yield = Actual yield /Theoretical yield × 100
Percentage yield = 330 / 395.83 × 100
Percentage yield of MgCl₂ = 83.4%
BRAINIEST PLS HELPP
Answer:
0.179kg/m3 hope that helps you out
What was the main purpose of the Colosseum in Rome?
It served as a space for public debates.
It was a place dedicated to the many gods.
It was used by leaders to address the citizens.
It was used to provide entertainment for the public.
Answer:
It was used to provide entertainment for the public.Explanation:
The Colosseum was basically an amphitheatre. It was a stage area where the public can see entertainment and concerts. The public also viewed executions of people who committed very bad crimes. The answer to the question is It was used to provide entertainment for the public.
ANWSER:It was used to provide entertainment for the public.
it is righit i made sure i di test got 100%d
I need help With this
Answer:
c
Explanation:
but I'm not 100 percent sure.
List the 5 characteristics of minerals
Answer:
Solid, Naturally Occurring, Inorganic, Fixed Composition, Crystal-like internal structure
Explanation:
You spill some acid on your clothes, causing a large hole to form where the acid touched the cloth. chemical or physical change.
Answer: Chemical
Explanation:
Answer:
Ah I think it's Chemical
Explanation:
Maybe, because it wasn't just move onto something, it changed it.
What my happen in the ecosystem of the fox was removed
Answer:
the popilation of mice will increase, since the fox was their only predator. and the population of snakes will decrease. since the fox was its only food source.
(hope this helps)
The useful energy a light bulb gives out is
(a). kinetic energy (b) chemical energy (c) light energy
science subject
Answer:
Light bulb gives light energy which is usefull
Answer:
(c) light energy
Explanation:
As bulb is used for giving light and hence the energy that it gives is light energy.
Which of the following can act as a Bronsted-Lowry acid?
1 H2O
2 NH
3 H2O
Answer:
H 2 O
Explanation:
H 2 O can act as a Brønsted-Lowry acid by donating a proton to produce its conjugate base OH - (known as the hydroxide ion). H 2 O can act as a Brønsted-Lowry base by accepting a proton to produce its conjugate acid H 3 O + (known as the oxidanium ion, or oxonium ion, or, in older textbooks as the hydronium ion (5)).
A plant releases oxygen into the ground through its roots. True or false
Answer:
false
Explanation:
This statement is false because plants release waste material, like oxygen, through small holes in the plants leaves.