Answers
Answer:
A
Explanation:
Related Questions
what is the density of a liquid if it's volume is 125 mL and it's mass is 50g?
Answers
Answer:
0.4g/ml
Explanation:
density= mass/volume
density=50g/125ml
density=0.4g/ml
What is the volume of 50.0 g of table sugar if the density of the sugar is 1.59 gcm3 ?
Answers
Answer:
31.45 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{50}{1.59} \\ = 31.446540...[/tex]
We have the final answer as
31.45 cm³Hope this helps you
Wax melts when it is heated. Which most likely describes what is true of the result of this reaction?
The bonding of the atoms is not the same before and after the change.
The wax has the same density before and after the change.
The same amount of wax exists before and after the change.
The wax cannot be changed back into a solid.
quickly help!!!
Answers
Answer:
The same amount of wax exists before and after the change.
Explanation:
Answer:
c -the same amount of wax exists before and after the change-
Explanation:
I did the quiz (edg.) :)
Some notes for you:
A physical change is a change in some of the physical properties of matter, but not in its identity.Wax melting is an energy change, and the energy change can be reversed, which means the wax cools into hard wax again. The wax didn't leave, nor did it somehow get less of it. It stays the same! :)I hope you have an amazing day, I mean it. God bless you!
john 7:37 <3
Determine the atomic number, atomic mass and element name of the following:
14 N
14
7
Answers
Answer:
Carbon-14
Carbon-14: with 6 protons and 8 neutrons, and an atomic mass of 14.
Rubidium is a soft, silvery-white metal that has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 80% and the abundance of 87Rb is 19.8%, what is the average atomic mass of Rubidium?
Answers
The average atomic mass of Rubidium : 85.226 u
Further explanationIsotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.
So Isotopes are elements that have the same Atomic Number (Proton)
Atomic mass is the average atomic mass of all its isotopes
In determining the mass of an atom, as a standard is the mass of 1 carbon-12 atom whose mass is 12 amu
Mass atom X = mass isotope 1 . % + mass isotope 2.%
The abundance of 85Rb is 80% and the abundance of 87Rb is 19.8%, so the average atomic mass of Rubidium :
[tex]\tt the~average~atomic~mass=0.8\times 85+0.198\times 87\\\\the~average~atomic~mass=\boxed{\bold{85.226~u}}[/tex]
true or false, the change from a gas to a liquid is condesation
Answers
Answer:
true
Explanation:
i hope this is right your welcome
Answer:
The definition of Condensation is the conversion of a vapour or gas to a liquid, so therefore, this can be proven as a true statement.
FOR 35 POINTS & A BRAINIST*
1.) For an atom of sulfur, there are
A.) two electron shells with 6 valence electrons
B.) three electron shells with 6 valence electrons
C.) four electron shells with 6 valence electrons
D.) five electron shells with 6 valence electrons
2.) Which atom has four electron shells with 7 valence electrons?
A.) F
B.) CI
C.) Br
D.) I
3.) Which atom has three electron shells with 8 electrons in its outermost orbit?
A.) He
B.) Ne
C.) Ar
D.) Kr
4.) Which method should be used to draw electrons that are involved in a collision during a chemical reaction?
A.) Bohr's model
B.) Lewis dot model
C.) Addition model
D.) Subtraction model
Answers
2.) C
3.) C
4.) B
I genuinely double checked that these were right! I hope it helps!!
Hair is composed of a protein called cellulose
O
True
O False
Answers
Answer:True
Explanation:
Iv done this before
FOR 50 POINTS & A BRAINIST*
1.) For an atom of sulfur, there are
A.) two electron shells with 6 valence electrons
B.) three electron shells with 6 valence electrons
C.) four electron shells with 6 valence electrons
D.) five electron shells with 6 valence electrons
2.) Which atom has four electron shells with 7 valence electrons?
A.) F
B.) CI
C.) Br
D.) I
3.) Which atom has three electron shells with 8 electrons in its outermost orbit?
A.) He
B.) Ne
C.) Ar
D.) Kr
4.) Which method should be used to draw electrons that are involved in a collision during a chemical reaction?
A.) Bohr's model
B.) Lewis dot model
C.) Addition model
D.) Subtraction model
Answers
Answer:
1. B
2. C
3. C
4. B
Explanation:
1. An atom of sulfur has an atomic number of 16. It has three electron shells and six valence electrons, therefore, it belongs to period 3, group VIA of the periodic table
2. Bromine has an atomic number of 35. It belongs to period 4 group VIIA of the periodic table. Therefore, it has four electron shells and seven valence electrons.
3. Argon has an atomic number of 18. It belongs to period 3, group IVA of the periodic table. Therefore, it has three electron shells and eight valence electrons.
4. The Lewis dot model use structures that represent the valence electrons of atoms within a molecule existing as lone pairs or when involved in bonding. They can be used to draw electrons that are involved in a collision during a chemical reaction.
ANSWER PLS ASAP Fireworks are an example of a
amount of energy being
Answers
Answer:
large, released
Explanation:
As we know, fireworks contain l o t s of energy, even before the burst of colors release. So i think choice 3 is the answer.
i hope this helps :)
A student flipped a coin 1000 times and recorded the outcome of each
and every flip. Her data showed 517 Heads and 483 Tails. Knowing the data
should have turned out with the same number of heads as tails, what is
her % error for tails?
17
3.4%
83
-0.034%
None of these
Answers
Answer:
i guess none of these or 3.4% for 10%
Explanation:
I think the answer should be in the 30 to 40 number scale
Which of the following has the larger atomic radius?
O Cs
O Ca
O Li
O Ba
Answers
Hope it helps
Which best explains how convection affects the atmosphere
Answers
Answer:
The heating of the Earth's surface and atmosphere by the sun drives convection within the atmosphere and ocean. This convection produces winds and ocean currents. The greater the pressure differences between a low-pressure area and a high-pressure area, the stronger the winds
The diagram above represents the melting of H2O(s). A 2.00mole sample of H2O(s) at 0°C melted, producing H2O(l) at 0°C. Based on the diagram, which of the following best describes the amount of heat required for this process and the changes that took place at the molecular level?
Answers
Heat : 12 kJ, to maintain hydrogen bonds
Further explanationGiven
A 2.00mole sample ⇒ n = 2 mol
H₂O(s) at 0°C melted, producing H₂O(l) at 0°C
Required
the amount of heat required
the changes that took place
Analysis
Conversion of mol to mass
Use formula of Heat :
Q = mLf (melting/freezing)
Lf=latent heat of fusion (for water=334 J/g)
Solution
mass H₂O(MW=18 g/mol) :
[tex]\tt mass=2\times 18=36~g[/tex]
Heat required :
[tex]\tt Q=36\times 334=12024~J\approx 12~kJ[/tex]
The absorbed heat is used to maintain hydrogen bonds in water molecules (there are two hydrogen bonds per molecule)
Paraphrase
The amount of heat required : 12 kJ, and to maintain hydrogen bonds
is combustion an example of the law of conservation of matter and why?
Answers
Answer:
Explanation:
The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases, equals the original mass of the charcoal and the oxygen when it first reacted.
An atom has 24 protons, 22 electrons, and 28 neutrons. What is the ATOMIC # of the atom?
Answers
The percent by mass is the ratio of the mass of each element to the total mass of the compound expressed as a percentage. Attached is the formula. What is the percent by mass of Oxygen in 10 grams of H20 given the mass by analysis of oxygen in that sample is 8 grams. (Answer should be given with a %. i.e. if the answer were 23% you answer in the textbox would be 23%)
Percent by mass = mass of solute mass of solution x 100
help me please:((
Answers
The percent by mass of Oxygen : 80%
Further explanationAccording to Proust: the mass percentage of the constituent elements of a compound is constant⇒compounds have a constant composition of elements
Given
mass of Oxygen (solute)= 8 grams
mass of H₂O(solution)=10 grams
Required
Percent by mass
Solution
[tex]\tt percent~by~mass=\dfrac{mass~oxygen}{mass~solution}\times 100\\\\percent~by~mass=\dfrac{8}{10}\times 100=80[/tex]
3. Why do gases deviate from the ideal gas law at high pressures? A. Molecules have finite volume. B. Cohesive forces increase the volume from the ideal. C. Increasing pressure increases the temperature of the gas. D. Collisions between molecules occur more frequently as pressure increases.
Answers
Answer:
A. Molecules have finite volume.
Explanation:
Gases deviate from the ideal gas law at high pressures because its molecules have a finite volume.
Real gases have a finite volume which enables more interaction between the molecules while ideal gases are assumed not to have a finite volume or occupy space which is why it lacks any form of interaction between its molecules.
This difference is the deviation between the real and ideal gases.
Explain, in your own words, what an electron configuration shows :
Answers
The central core of an atom is called the __?
Answers
Answer: Atomic Nucleus!
Explanation: All atoms have a dense central core called the atomic nucleus. Forming the nucleus are two kinds of particles: protons, which have a positive electrical charge, and neutrons, which have no charge.
(Yes, it was from google.)
what would most likely be joined by an ionic bond?
Answers
Answer:
magnites
Explanation:
i dont know what this is so sorry but my guess is magnites.
Answer:
Your a bad person, i gave 100 points for just 3 paragraphs and you and another person just put 1 sentence, you have a bad moral
Explanation:
The following image shows the Atomic level of an element. In the image, which of
the following processes is NOT taking place as the element becomes stable. *
152 25+ 2p 35
152252 2p on ~ (Nel
le-
Na
+
Nat"
Tose
Iyolence election
8 valence electrons
O The loss of an electron Anveils an octet at the 2nd energy level to make it stable
The loss of an electron allows the element to take on a noble gas electron
configuration
Na is sodium is a metal and loses 1 e-
O The cation will use a type Ii naming system
O Na is neutral, loses 1 e- and then becomes a positive charged ion Na+
Answers
Answer:
D. The cation will use a type II naming system
Explanation:
As the element becomes stable, Option D is NOT taking place. That means that as the element becomes stable, the cation will NOT use a type II naming system. This is because in Type II binary compounds, the metal is not found in either Group 1 or Group 2 on the periodic table. It is as a result of this that the cation will not use a type II naming system.
Group 1 and Group 2 elements make use of type I naming system because in Type I binary compounds, the metal is present.
Option D is the correct answer.
2 points
This occurs if milk overheats. Solids settle on the sides and some fall into
the bottom of the pan. It may caramelize, burn and develop an off-flavor.
Scorching
Scalding
Curdling
Foaming
Answers
Answer:
curdling.
Explanation:
Complete the following nuclear bombardment equation by filling in the nuclear symbol for the missing species.
²³⁵₉₂U + ¹₀n → ? + ¹³⁹₅₄Xe + 3 ¹₀n
Answers
Answer:
Strontium [tex]94_{38}[/tex]Sr
Explanation:
By the law of mass conversion the nuclear mass remains constant in a reaction which means initial mass and atoic number will be equal to final atomic number and atomic mass respectively.
²³⁵₉₂U + ¹₀n → ? + ¹³⁹₅₄Xe + 3 ¹₀n
Here atomic mass =
235 + 1 = A + 139+3 ( A -= atomic mass of ?)
A = 236 - 142
A = 94
And, atomic number would be =
92 = B + 54
B = 92 - 54
B = 38
So, the atomic number of ? will be 38 and atomic mass will be = 94
The element with 38 atomic number is = Strontium [tex]94_{38}[/tex]Sr
The missing species in the equation is ⁹⁴₃₈Sr
Let the missing species be ᵇₐY
We can write the equation as:
²³⁵₉₂U + ¹₀n → ᵇₐY + ¹³⁹₅₄Xe + 3¹₀n
Next, we shall determine the value of b235 + 1 = b + 139 + 3(1)
236 = b + 139 + 3
236 = b + 142
Collect like terms
236 – 142 = b
b = 94Next, we shall determine the value of a92 + 0 = a + 54 + 0
92 = a + 54
Collect like terms
92 – 54 = a
a = 38Finally, we shall determine Yb = 94
a = 38
Y =?ᵇₐY => ⁹⁴₃₈Y => ⁹⁴₃₈Sr
The balanced equation is:
²³⁵₉₂U + ¹₀n → ⁹⁴₃₈Sr + ¹³⁹₅₄Xe + 3¹₀n
Learn more: https://brainly.com/question/19752321
Most recent fossils are found in which layer of rock?
Answers
Answer: The most recent three layers are the Paleozoic, Mesozoic, and Cenozoic. These layers represent the last 500 million years of life on earth. In the Paleozoic, you find fish, amphibian, and reptile fossils (in that order), but never dinosaurs, birds, modern mammals, or even flowering plants.
Explanation:
Most recent fossils are found in Paleozoic, Mesozoic, and Cenozoic. The type of rock is sedimentary rock.
What are fossils?Fossils are defined as the well-preserved remnants of plants and animals whose carcasses were buried beneath ancient seas, lakes, and rivers in sediments like sand and muck. There are several ways that fossils are created, but the majority occur when an animal or plant dies in a wet environment and is buried in mud and silt.
A new fossil species has been found in a fossil deposit close to Llandrindod Wells in central Wales, according to an international team of experts. Numerous characteristics of Cambrian fossil Mierridduryn bonniae are shared by both. Rock and sediment layers build up on top of one another over time. The oldest and youngest rock layers are always found in reverse order.
Thus, most recent fossils are found in Paleozoic, Mesozoic, and Cenozoic. The type of rock is sedimentary rock.
To learn more about fossils, refer to the link below:
https://brainly.com/question/6867325
#SPJ2
Someone please help will mark as brainliest
Answers
Answer:
If heart disease is suspected, we use two-dimensional doppler imaging technologies that take in-depth images of the heart. The doppler system records sound waves as they bounce off blood cells in your heart and change pitch. The blood flow shown in these images is colorized to better detect any problems.
Explanation:
Answer:
look it up it should a better answer than me
Explanation:
which information does the chemical formula co2 not give you?
A. number of valence electrons in each atom
B. ratio of atoms in the compound
C. total number of atoms in one molecule of the compound
D. type of elements in the compound
Answers
Answer:
A
Explanation:
Considering the definition of chemical formula, the correct answer is option A): number of valence electrons in each atom.
A chemical formula is the representation of the elements that make up a compound and the proportion in which they are found, or the number of atoms that make up a molecule.
In other words, a chemical formula is an alphanumeric expression that is used to indicate the composition of a chemical substance and that is constructed from the symbols of its constituent elements, affected by numerical subscripts that report the number of atoms of each element that it is part of the substance.
In summary, the correct answer is option A): number of valence electrons in each atom.
Learn more:
https://brainly.com/question/18452587?referrer=searchResultshttps://brainly.com/question/21406550?referrer=searchResultsWhich measurement is a vector?
Answers
Who said that the atom had to have small negative particles suspended
in a positive cloud-like substance?
Answers
Answer:
hello
Explanation:
A car travels 65 miles in 1 hour. What is the average speed of the car?