Answer:
It is the length of these chains, and the patterns in which they are arrayed, that make polymers strong, lightweight, and flexible.
Explanation:
Synthetic polymers are made up of long chains of atoms, arranged in repeating units, often much longer than those found in nature. It is the length of these chains, and the patterns in which they are arrayed, that make polymers strong, lightweight, and flexible. In other words, it's what makes them so plastic.
A machine increase the rate of doing ______.
Sharp instruments are called ______.
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Discussion Question: Your classmate said,
"I think Gold is a pure substance that can't be broken down any further
Do you agree or disagree with this statement. Explain your reasoning using clues from the statement and the periodic
table.
Answer:
yes gold is pure
Explanation:
Need help with #1 and #2
Answer:
To calculate half life, divide original value by 2.
1.
FOUR HALF LIVES = divide original value by 2, 4 times.
40÷ 2 = 20
20 ÷ 2 = 10
10 ÷ 2 = 5
5 ÷ 2 = 2.5g
2. AFTER TEN DAYS (TWO HALF LIVES)
140 ÷ 2 = 70
70÷ 2 = 35g
AFTER TWENTY DAYS (FOUR HALF LIVES)
140 ÷ 2 = 70
70 ÷ 2 = 35
35 ÷ 2 = 17.5
17.5 ÷ 2 = 8.75g
If 83.6 grams of H2 and 257 grams of N2 react, how many grams of ammonia will be produced?
The mass of ammonia that would be produced is 312.5 g
First, we will write a balanced chemical equation for the reaction
The balanced chemical equation for the reaction is
3H₂(g) + N₂(g) → 2NH₃(g)
This means
3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia.
First, we will determine the number of moles of each reactant present
For Hydrogen (H₂)
Mass = 83.6 g
Molar mass = 2.016 g/mol
Using the formula
[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]
Number of moles of H₂ present = [tex]\frac{83.6}{2.016}[/tex]
∴ Number of moles of H₂ present = 41.468254 moles
For Nitrogen (N₂)
Mass = 257 grams
Molar mass = 28.0134 g/mol
∴ Number of moles of N₂ present = [tex]\frac{257}{28.0134}[/tex]
Number of moles of N₂ present = 9.174181 moles
Since,
3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia
Then,
27.522543 moles of hydrogen gas will react with the 9.174181 moles of nitrogen gas to produce 18.348362 moles of ammonia
∴ 18.348362 moles of ammonia will be produced during the reaction
Now, for the mass of ammonia that would be produced
From the formula
Mass = Number of moles × Molar mass
Molar mass of ammonia = 17.031 g/mol
Mass of ammonia that would be produced = 18.348362 × 17.031
Mass of ammonia that would be produced = 312.49095 g
Mass of ammonia that would be produced ≅ 312.5 g
Hence, the mass of ammonia that would be produced is 312.5 g
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Why do humans have a tailbone? What could it tell us about our past?
Answer:
Monkey have tail we come from monkey
Answer:
The coccyx, or tailbone, is the remnant of a lost tail. ... The coccyx serves as an attachment site for tendons, ligaments, and muscles. Tailbones helped our ancestors with mobility and balance
Explanation:
Which chemical family below would the element iodine most likely belong to?
Family D
Family C
Family A
Family B
Answer:
it is option A
Explanation:
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Answer:
B I and II
Explanation:
warming and melting.
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which scientist also arranged the elements by increasing atomic mass and used the pattern to predict the existence of elements yet to be discovered?
solutions of barium bromide and sodium phosphate combine to form solid barium phosphate and aqueous sodium bromide. true or false?
Answer:
The Answer Is False
Explanation:
I Just Think Thats The Answer
(ii)
Copper and potassium have different melting points and boiling points.
Give one other difference between the properties of copper and potassium.
Answer:
ExplanationWhat are the properties of potassium?
Image result for give one other difference between the properties of copper and potassium
Potassium metal is soft and white with a silvery lustre, has a low melting point, and is a good conductor of heat and electricity. Potassium imparts a lavender colour to a flame, and its vapour is green. It is the seventh most abundant element in Earth's crust, constituting 2.6 percent of its mass.:
Difference between copper and potassium is the valence electron of sodium is in the 3s orbital whereas the valence electron of potassium is in the 4s orbital.
What are the properties of potassium?Potassium metal is soft and white with a silvery luster, has a low melting point, and is a good conductor of heat and electricity.
What are the properties of copper?It is malleable, ductile, and an extremely good conductor of both heat and electricity. It is softer than zinc and can be polished to a bright finish.
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I need help with this question can someone help me with it
Answer:
sorry but can't understand your question properly
In the fall, how does the high pressure area
affect the hurricane?
Answer:
Hurricanes occur when ocean water warms during the spring, summer and early fall.
Explanation:
Warm air just above the water’s surface rises. The rising warm air creates a reduction in pressure at the surface, what meteorologists call a low-pressure area. Because nearby air is at a higher pressure, it will flow into the low-pressure zone.
https://www.sidmartinbio.org/how-does-a-high-pressure-system-affect-a-hurricane/
Was arsenic able to replace Phosphorus in DNA?
Answer:
Arsenic-tolerant GFAJ-1 bacteria were reported to have replaced some of the phosphorus (P) in their DNA with arsenic. ... These bacterial cells were very efficient at using the small amount of available phosphate in preference over the easily available arsenic. so yes.
Explanation:
hope this helps
Answer:
Yes
Explanation:
Hope everything goes well with your work :D
Please help. Thank you!
what is the electron configuration of uranium at its ground state (in order) AND noble gas configuration?
Answer: Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 electrons in the atomic structure. The chemical symbol for Uranium is U. Electron configuration of Uranium is [Rn] 5f3 6d1 7s2. Possible oxidation states are +3,4,5,6.
Explanation:
Answer:
Electron configuration of uranium at its ground state: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6s6 5f3 6d1 7s2
Noble gas configuration: [Rn] 5f3 6d1 7s2.
as a bystander, the _______ approach doesn’t work when drugs or alcohol are involved, as the person you’re trying to stop is more likely to become defensive or hostile.
When trying to step into an argument or misunderstanding between people as a bystander with drugs and alcohol involved, the direct approach won't work.
When trying to make peace between quarelling individuals as a bystander, the direct approach would fail if alcohol or drugs is being held as the prsin might see you as a villian. Only when the person knows and trusts you will this approach work. Hence, when drugs or alcohol is involved, other methods of rendering help should be employed.Therefore, the direct approach won't work in the this scenario.
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in which step of the scientific method do we want to use graphs
Explanation:
The next step in the scientific method is to analyze the data. Data analysis is the process of interpreting the meaning of the data we have collected, organized, and displayed in the form of a table or graph.
In a simple covalent compound, which statement is TRUE
about naming the second element in the compound?
a
The second element to be named is the one closer
to the left side of the periodic table.
The second element is given a prefix to represent
b how many of the element are present, and there
are no other changes to the element's name.
The second element to be named is the one closer
c to the right side of the periodic table, and it is given
the suffix -ide.
The element closer the right side of the periodic
d table is given its usual element name with no
changes.
Answer:
C:to the right side of the periodic table, and it is given
the suffix -ide.
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Answer:
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Q4. What are the different ways in which human being use rocks ?
Answer:
To hit someone on the head
Explanation:
self protection
how would the rate of diffusion change if the po2 in the capillaries was 40 mmhg and the po2 in the muscle cell changed from 40 to 20 mmhg?
The rate of diffusion change would increase if the PO₂ in the capillaries was 40 mmHg and the PO₂ in the muscle cell changed from 40 to 20 mmHg.
Simple diffusion is the movement of molecular substances from a region of higher concentration to lower concentration. The mechanism with which the movement of O₂ travels from the blood to the body tissues takes place with the use of simple diffusion.
Now, if PO₂ changes from 40 → 20 mmHg in the muscle cells, and the PO₂ in the blood = 40mmHg. It implies that the pressure gradient(P) has increased. As such, there is an increase in the rate of diffusion of oxygen from the blood to muscle cells.
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write the stracture of 2,2-dimetyl butane
Answer:
Explanation:
Let's break it down:
Butane- A 4 carbon alkaneMethyl - A CH₃ group2,2 - Both the Methyl groups are attached at carbon 2We can now draw the structure of 2,2-dimethyl butane using the following steps:
Draw the backbone (butane)Draw the substituents (2 methyl groups at carbon 2)
The figure above shows two closed containers. Each contains the same volume of acetone in equilibrium with its
Yanar at the same temperature. The vapor pressure of the acetone is
The vapor pressure of a liquid and the prevailing atmospheric pressure,
determines the boiling point temperature.
The vapor pressure of the acetone is the same in both containers because
the temperature is the same.
Reasons:
The vapor pressure of a liquid is the pressure at which the number of
molecules entering the gaseous phase are in (dynamic) equilibrium with
the number of molecules entering the liquid phase.
The factors that affect vapor pressure are;
The type of molecules that make up the liquid or solidThe temperature of the liquid or solidChanging the surface area changes the instantaneous concentration of
molecules of vapor above the liquid, however, an equilibrium vapor
pressure is reached with time as more molecules enter or exits the liquid
(or solid) due being over or under saturated.
Therefore, the surface area of the liquid has no effect on a liquid's vapor
pressure therefore;
The vapor pressure in both containers will be the same because the temperature is the same.
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which group of the periodic table is composed of inert gases
Answer:
Group 0
Explanation:
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stay positive...
The group zero of the periodic table is composed of inert gases.They are very unreactive So, they don't form molecules easily and are found as single atoms.
Which group of metals is inert?"Noble metals, such as gold, platinum, silver, and a few rare metals. Members of this class have little or no tendency to unite with oxygen in the free state and do not change composition when placed in water at a red heat.
Noble gas atoms already have complete outer shells and have no tendency to lose, gain, or share electrons. As a result, noble gases are inert and do not participate in chemical reactions.
Because their outermost shells are completely filled, zero group elements are inert. They have no tendency to lose, gain, or share electrons with other elements.
Thus, The group zero of the periodic table is composed of inert gases because they are unreactive.
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what is the wavelength of microwaves if the frequency is 2.45x 10^9 HZ?
Wavelength = Speed of Light ÷ Frequency
= (2.99 × 10⁸ m/s) ÷ ( 2.45 × 10⁹ /s)
= 1.22 × 10⁻¹ m
The wavelength of a light of frequency 2.45 × 10⁹ /s is 1.22 × 10⁻¹ m.
Notes:
Hz ≡ /s
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Answer:
i think the answer is C
Explanation:
if wrong im sorry
The atomic number of an element:
#1. Tells you the mass of the atom
#2. Tells you the number of energy levels there are around the atom
#3. Tells you the identity of the atom
#4. Tells you how many valence electrons the atom has
Answer:
I think #3 might be the answer .
Because in #1 atomic mass tells mass .
#4 Atomic number doesnot only tell about the electrons atom has
Which of the following is an example of chemical energy being used?
(A) Battery in a flashlight
(B) Ice melting
(C) Riding a bicycle
(D) Mercury rising in a thermometer
Answer:
(A) Battery in a flashlight
Explanation:
Because the chemicals in the battery are being converted to light and heat energy from the bulb!
Answer: D
Explanatione: I hope this helped :)
3. What is the energy of a photon that has a frequency of 2.3 x 1014 Hz?
The energy of a photon that has a frequency of 2.3 x 10¹⁴ Hz is 1.524 × 10-¹⁹J
HOW TO CALCULATE ENERGY OF A PHOTON:
The energy of a photon can be calculated by using the formula as follows:E = hf
Where;
E = energy of photon (J)
h = Planck's constant (6.626 × 10-³⁴J)
f = frequency of photon (Hz)
According to this question, a photon has a frequency of frequency of 2.3 x 10¹⁴ Hz. The energy of the photon can be calculated as follows:E = 6.626 × 10-³⁴ × 2.3 × 10¹⁴
E = 15.24 × 10-³⁴+¹⁴
E = 15.24 × 10-²⁰J
E = 1.524 × 10-¹⁹J
Therefore, energy of a photon that has a frequency of 2.3 x 10¹⁴ Hz is 1.524 × 10-¹⁹JLearn more at: https://brainly.com/question/23180082?referrer=searchResults
carbon cycle carbon cycle
Hope you could get an idea from here.
Doubt clarification - use comment section.
CONNECT IT
Relate how a household sponge and water can be used to model
the concept of an unsaturated solution, a saturated solution, and a supersaturated
solution.
The sponge is unsaturated when it is taking in more water. It becomes saturated when it stops taking in water. It is supersaturated when water starts oozing out from the sponge.
A saturated solution contains just as much solute as it normally hold at a particular temperature. An unsaturated solution contains less solute than it can normally hold at a particular temperature. A supersaturated solution contains more solute than it can normally hold at a particular temperature.
We can use a sponge to model these three scenario as follows;
Water continues to enter into the sponge when it is unsaturated, this continues until the sponge becomes saturated with water and takes in no more water. When the sponge becomes supersaturated, water begins to ooze out from the sponge because it can no longer hold more water.
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