Answer:
D) Previous models
Got it right on USTestPrep
Answer:
previous models
Explanation:
I did it
What type of energy is caused by positive and negative charges in matter
Answer:
Static electricity is the result of an imbalance between negative and positive charges in an object. These charges can build up on the surface of an object until they find a way to be released or discharged.
Explanation:
18. How far does Larry move if traveling at 2m/s for 100s?
Answer:
200 m
Explanation:
Given data:
Speed of larry = 2 m/s
Time taken = 100 s
Distance travelled = ?
Solution:
Formula:
d = st
d = distance
s = speed
t = time
by putting values,
d = 2 m/s× 100 s
d = 200 m
Two important ways that energy is transported in the world around us is through
Explanation:
The two ways that energy can be transferred are by doing work and by heat transfer.
what evidence is there of energy release after chemical reaction
Answer:
loss of mass
Explanation:
your welcome :)
PET plastic # 1 is used in water bottles and pop bottles. Why should they be recycled but not be reused?
They should be recycled but not reused because the "repeated use increases the risk of leaching and bacterial growth." Also, recycling PET plastic "results in reduced energy consumption, lower cost, and reduced environmental impact."
Plzzzzz helppppp it’s due already I’ll mark Brainly
12. Draw the lewis structure for the element to help you answer the question *
Answer:hope it helps
Explanation:
Explain cell division in multicellular organisms?
Answer:
the divide through osmosis of mitosis or sum
Explanation:
Answer:
In multicellular organisms, cell division aids in the formation of gametes, which are cells that combine with others to form sexually produced offspring. For growth to occur in living organisms, the number of cells have to increase through cell division until it reaches its maximum size. The human body also repairs injuries by means of cell division.
I hope this answer helps you find your answer! Have a great day! :)
Please help me, Thank you!
Answer:
B. Opposite
Explanation:
When one electron is transferred from sodium to chlorine, a pair of ions with oppositely charged ions is formed.
The electrostatic attraction between the ions forms a covalent bond between them.
When atoms lose or gain electrons, they become ions due to the charge imbalance within them. If sodium lose an electron, it becomes positively charged. when the electron is gained by chlorine, it becomes negatively charged These oppositely charged ions combined to form the ionic compound.I JUST NEED HELP!!!! ASAP!!!!
Hydrogen cyanide has the chemical formula HCN. What's the formal charge on the N atom?
A)
+2
B)
0
C)
–2
D)
–1
Answer:
Formal charge = valance electron - nonbonding electron - (1/2)bonded electron
For nitrogen atom,
Formal charge = 5 - 2 - (1/2)×6
= 5-2-3
= 0
So, the formal charge on nitrogen atom in HCN is "0".
Explanation:
The formal charge on the N atom of hydrogen cyanide, HCN molecule is 0. Option B is correct.
Formal charge is defined as the individual charge of an atom. It is represented as:
Formal charge = valance electron - nonbonding electron - (1/2)bonded electron
The valence electrons in nitrogen atom is 5, there are 2 non bonding electrons and 6 bonded electrons on N atom in HCN,
Thus, For Hydrogen cyanide molecule, the formal charge on nitrogen atom is calculated as:
Formal charge
= 5 - 2 - (1/2)×6
= 5-2-3
= 0
So, the formal charge on nitrogen atom in HCN is "0".
To know more about formal charge here
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Li²O, # of Elements and Atoms
Answer:Lithium atomic orbital and chemical bonding information. There are also tutorials on the first thirty-six elements of the periodic table includes: Li²O
Please help and I will give brainliest!
I am going to put them in order
R r
R RR rR
r rR rr
What happen when? sodium oxide reacts with HCL
Answer:
Sodium oxide reacts exothermically with cold water to produce sodium hydroxide solution. A concentrated solution of sodium oxide in water will have pH 14. ... For example, it reacts with dilute hydrochloric acid to produce sodium chloride solution.
Question 10
1 pts
Which of the following statements is true about the mass of an atom?
The mass is equal to the neutrons plus the valance electrons
The mass of an atom is equal to the protons plus the neutrons
O The mass is equal to the protons plus the electrons
The mass is equal to the mass of the protons plus the valence electrons
+ Previous
Next >
Answer:
The mass of an atom is equal to the protons plus the neutrons
the boiling point of isopropyl alcohol is 82.5°C. a student conducts an experiment and finds a boiling point of 83.1°C. what is the students percent error in this experiment?
A.0.6%
B. 0.7%
C. 1.0%
D. 99.3%
Answer:
B. 0.7%
Explanation:
Given data:
Actual boiling point = 82.5°C
Experimental boiling point = 83.1°C
Percent error = ?
Solution:
Formula:
Percent error = ( actual value - experimental value / actual value )×100
by putting values,
Percent error = (82.5°C - 83.1 °C /82.5°C) × 100
Percent error = 0.007 × 100
Percent error = 0.7 %
Negative sign shows that experimental value is greater than accepted value. It can not written in result.
I'd love some help please thank you
Answer:
the answer would be B
Explanation:
The move vigorously it is the higher the reactivity so if you put it in order the answer would be B
7 Ba(ClO3)2
How many oxygen atoms are shown?
calculate the percentage by mass of oxygen in ammonium nitrate
Answer:
Percent composition of O is 48g80g×100%=60%
need help with physical changes
Answer:
I give u three in explanation
Explanation:
Crushing the can, stomping on the can, and squishing the can
Magnetic Quantum Number tells you what? how many orbitals are in s, p ,d?
16.
Magnesium reacts with hydrochloric acid according to the equation below.
Magnesium bertindak balas dengan asid hidroklorik mengikut persamaan berikut.
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
What is the volume of hydrogen gas produced at room condition if 0.6 g of
magnesium is added to the excess of sulphuric acid?
[Relative atomic mass : Mg = 24 : molar volume = 24 dmº mol' at room condition]
Berapakah isipadu gas hidrogen yang dihasilkan pada keadaan bilik jika 0.6 g
magnesium ditambahkan kepada asid hidroklorik berlebihan."
[Jisim atom relative:Mg = 24 : isipadu molar = 24 dm mol! pada keadaan bilik]
A 0.6 cm
B 6.0 cm
C 60.0 cm
D 600 cm
What did most of the particles that Rutherford shot at the gold foil do? What was the surprising behavior of a few of the particles? What did he determine?
Answer:
Explanation:
Rutherford gold experiment gave the explanation to some observations made on atoms.
When he shot the gold foil, most of the [tex]\alpha[/tex]-particles passes through the foil undeflected nor absorbed. This faction of the particles propagated the foil as if there was nothing placed on their path.
The surprising behavior of a few of the [tex]\alpha[/tex]-particles was that they were deflected from their initial path on hitting the gold foil.
This implies that there is a part of the gold foil which has the same charge as the [tex]\alpha[/tex]-particles, and more massive than the particles. Thus, he was able to determine the nucleus of an atom.
If you knew the number of valence electrons in a nonmetal atom how would you determine the valence of the element. (Ignore hydrogen)
Answer:
The possible valances can be determined by electron configuration and electron negativity
Good Luck even though this was asked 2 weeks ago
Explanation:
All atoms strive for stability. The optima electron configuration is the electron configuration of the VIII A family or inert gases.
Look at the electron configuration of the nonmetal and how many more electrons the nonmetal needs to achieve the stable electron configuration of the inert gases. Non metals tend to be negative in nature and gain electrons. ( They are oxidizing agents)
For example Florine atomic number 9 needs one more electron to reach a valance number of 8 electrons to equal Neon atomic number 10. Hence Flowrine has a valance of -1
Oxygen atomic number 8 needs two more electrons to reach a valance number of 8 electrons to equal Neon atomic number 10. Hence Oxygen has a valance charge of -2.
Non metals with a low electron negativity will lose electrons when reacting with another non metal that has a higher electron negativity. When the non metal forms an ion it is necessary to look at the electron structure to determine how many electrons the element can lose to gain stability.
For example Chlorine which is normally -1 like Florine when it combines with oxygen can be +1, +3, + 5 or +7. It can lose its one unpaired electron, or combinations of the unpaired electron and sets of the three pairs of electrons.
Explain why no experiment is a failure.
Answer:
No experiment is a failure, because anytime you mess up, you learn from your mistakes and when you try the experiment again you can fix what you messed up on last time.
yrup, USP, is prepared by dissolving 850 g of sucrose in sufficient purified water to make 1000 mL of syrup. Syrup has a specific gravity of 1.31. How many milliliters of water are used to prepare two liters of syrup?
Answer:
920mL of water
Explanation:
To solve this question we need to find as first the mass that must be added of water to make 1000mL of syrup using specific gravity. Thus, we can know the volume of water that mus be added:
1.31 is 1.31g/mL. In 1000mL = 1310g/1000mL. As the mass added of sucrose is 850g, the mass of water = Volume of water is:
1310g - 850g = 460g of water = 460mL to make 1L, To make 2L the amount of water that must be added is:
460mL * 2 =
920mL of waterThe number of milliliters of water are used to prepare two liters of syrup is 920 mL of water.
Given that,
USP, is prepared by dissolving 850 g of sucrose in sufficient purified water to make 1000 mL of syrup. The Syrup has a specific gravity of 1.31.Based on the above information, the calculation is as follows:
1.31 is = 1.31g/mL.
Now
In 1000mL = [tex]1310g \div 1000mL[/tex].
Now if the mass is added so the mass of water should be equivalent to the volume of the water.
= 1310g - 850g
= 460g of water
Now
= 460mL for 1L,
To make 2L the water should be
= 460mL (2)
= 920mL of water
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If an 85.0 mL container of helium gas at standard pressure is heated from 20.oC to 91oC and the pressure is increased to 2.8 atm, then what would the new volume be for the He gas
Answer: V₂ = 37.71mL
Explanation: To determine the new volume of Helium gas, use the Combined Gas Law, which states the following relationship among pressure, volume and temperature:
[tex]\frac{P_{1}V_{1}}{T_{1}} =\frac{P_{2}V_{2}}{T_{2}}[/tex]
where index 1 relates to the initial state of the gas and index 2 to the final state of the gas.
Temperature is in Kelvin, so:
T = °C + 273
For this situation, standard pressure is 1 atm. Temperatures will be:
T₁ = 20 + 273 = 293 K
T₂ = 91 + 273 = 364 K
Solving:
[tex]V_{2}=\frac{T_{2}P_{1}V_{1}}{P_{2}T_{1}}[/tex]
[tex]V_{2}=\frac{364*1*85}{2.8*293}[/tex]
[tex]V_{2}=\frac{30940}{820.4}[/tex]
[tex]V_{2}=[/tex] 37.71
The new volume of He gas is 37.71 mL.
Helga has a box. She wants to determine how much the box can hold. Which measurement should she calculate?
A) Length
B) Area
C) Volume
D) Perimeter
C) volume
Explanation:
hope it helps !
Answer:
Volume. "How much the box can hold" means how much matter can fit into the box
Additional Practice Questions
5. If you had a pH of 4.30 in a 5.00 L sample, how many
moles of hydronium do you have?
Moles of hydronium (H₃O⁺) : 2.5 x 10⁻⁴
Further explanationGiven
pH = 4.3
V sample = 5 L
Required
moles of H₃O⁺(hydronium)
Solution
pH = - log [H₃O⁺]
4.3 = - log [H₃O⁺]
[tex]\tt [H_3O^+]=10^{-4.3}~M=10^{-4.3}mol/L[/tex]
Moles of hydronium for 5 L sample :
[tex]\tt 5~L\times 10^{-4.3}mol/L=5.10^{-4.3}moles=2.5\times 10^{-4}~moles[/tex]
5.0g of copper is heated from 20 Celsius to 80 Celsius. How much energy it was used to heat Cu? (Specific heat capacity of Cu is 0.092 cal/g)
Answer:
the energy used to heat Cu is 27.6 Cal
Explanation:
given data
mass m = 5 g
Specific heat capacity of Cu = 0.092 cal/g
temperature T2 = 80 Celsius
temperature T1 = 20 Celsius
solution
we get here energy used to heat Cu that is express as
Q = m × c × ΔT ....................1
so here m = mass and c = specific heat capacity
and ΔT = T2 - T1
so put value in eq 1
Q = 5 × 0.092 × (80 - 20)
Q = 27.6 Cal
so that the energy used to heat Cu is 27.6 Cal
What is an orbital? How does it differ from an orbit?
Answer:
An orbit is the simple planar representation of an electron. An orbital refers to the dimensional motion of an electron around the nucleus in a three-dimensional motion. An orbital can simply be defined as space or the region where the electron is likely to be found the most.
Explanation:
Answer:
An orbital on the other hand is simply the probable area where one can expect to find the maximum density of electron presence within an atom. An orbit on the other hand is simply present in a body with a certain mass, while an orbital exists for an electron as well as an atom.
Thus, these are the simple differences between Orbit and Orbitals. It is important to know the major differences, you can check out the differences between Orbit and Orbitals below:
Differences between Orbit and Orbitals
Orbit Orbitals
An orbit is the simple planar representation of an electron. An orbital refers to the dimensional motion of an electron around the nucleus in a three-dimensional motion.
It can be simply defined as the path that gets established in a circular motion by revolving the electron around the nucleus An orbital can simply be defined as the space or the region where the electron is likely to be found the most.
The shape of molecules cannot be explained by an orbit as they are non-directional by nature. The shapes of the molecules can be found out as they are directional by nature.
An orbit that is well-defined goes against the Heisenberg principle. An ideal orbital agrees with the theory of Heisenberg’s Principles.
Thus, these are the major differences between Orbit and Orbitals.