Answer:
A) mass cannot enter or exit an isolated system
Explanation:
An Isolated system is both insulated and sealed. No matter or energy can neither escape into the surroundings nor enter from the surroundings
Answer: A. mass cannot enter and exit an isolated system
Explanation: just took the quiz
Help!
The quantity of matter anything contains.
A. weight
B. mass
C. volume
Answer: B. Mass
Explanation: The quantity of matter anything contains is called mass.
3.
Which statement(s) is/are TRUE for all chemical reactions?
Answer:
the statement is or are true for all chemical reaction is false
Explanation:
if you think the answer is correct then mark me as brain list
How many protons electrons and neutrons does an atom with atomic number 50 and mass number 125 contain
Answer:
A.
Explanation:
50 protons,50 electrons, 75 neutrons.
Hope this helped!
May I get brainliest I need to rank up :)
why was alchemy so confusing?
Help please!!!! I only have a couple mins
Answer:
D i am prety shure
Explanation:
Answer:-D
Explanation:
9.Which part of the conductivity apparatus should you never touch
Answer:B- Leads
Explanation:
just did the quiz and got it right
Fakeium has four isotopes found on Earth but they’ve only been recently discovered. Do your part as a scientist and calculate the average atomic mass for fakeium so it can be added to the periodic table.
Fa - 85 is 31% of all the isotopes found.
Fa - 86 is 12% of all the isotopes found.
Fa - 87 is 38% of all the isotopes found.
Fa - 88 is 19% of all the isotopes found.
CHOICES:
84.65 g
87.00 g
87.50 g
86.45 g
Answer:
86.45 g
Explanation:
Given data:
Percent abundance of Fa - 85 = 31%
Percent abundance of Fa - 86 = 12%
Percent abundance of Fa - 87 = 38%
Percent abundance of Fa - 88 = 19%
Average atomic mass of Fa = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)+ (abundance of 3rd isotope × its atomic mass) + (abundance of 4th isotope × its atomic mass) / 100
Average atomic mass = (31×85)+(12×86) +(38×87)+(19×88) /100
Average atomic mass = 2635 +1032 +3306 +1672 / 100
Average atomic mass = 8645 / 100
Average atomic mass = 86.45
(First to answer gets some good) Order the following components of the universe from largest to smallest: Moon, planet,universe,star,galaxy,nebula,comet!
Answer:
Universe, galaxy, solar system, star, planet, moon and asteroid.
Explanation:
You're welcome!
which is a reactant in the cellular respiration reaction
Answer: Oxygen and glucose are both reactants in the process of cellular respiration.
Explanation: Oxygen and glucose are both reactants in the process of cellular respiration. The main product of cellular respiration is ATP; waste products include carbon dioxide and water.
Answer: B or Oxygen
Explanation:
Edge 2021
How is eight molecules of Sulphur written
8S8 or 8S
To solve this we must be knowing each and every concept related to molecule. Therefore, eight molecules of Sulphur is written as S[tex]_8[/tex].
What is molecule?A molecule is an electrically neutral collection of two or more atoms linked together by chemical bonds. Here are several instances of molecules, as well as an explanation of the differences between particles, compounds, and ions.
An atom is indeed the element's smallest unit. A single element's atoms all have the same amount of protons. Atoms cannot be separated further using any chemical process. A molecule, on the other hand, is the basic unit of such a pure material. Eight molecules of Sulphur is written as S[tex]_8[/tex]. 8s is wrong representation.
Therefore, eight molecules of Sulphur is written as S[tex]_8[/tex].
To know more about molecule, here:
https://brainly.com/question/14130817
#SPJ2
How are nymphs different from adult insects?
Answer:
Explanation:
the nymph looks like a smaller version of the adult insect, & it also has no wings & molts.
Doctors are seeing an alarming increase in the number of cases of tuberculosis (TB) that is resistant to drugs commonly used to treat the disease. TB is difficult to pass to other people without prolonged contact, but it is often fatal if it is not treated.
How will doctors most likely respond to someone who has an active case of drug-resistant tuberculosis?
Answer:
Doctors will use other drugs that are known to be able to treat TB, even if they are less effective than the common drugs.
Explanation:
When a case of drug resistance is established, the doctor has to change the prescription and give other drugs that are also known to be effective against the organism.
Bacterial drug resistance is a common clinical experience. Many established drugs have been found to be ineffective in treating common infections leading to the continuous quest for improved antibiotics that are active against most organisms.
When doctors discover that someone who has an active case of drug-resistant tuberculosis, the doctor may need to change the prescription to other drugs that are also known to be effective against Mycobacterium tuberculosis, the causal agent of tuberculosis.
Learn more: https://brainly.com/question/2124849
A chemical change always involves a change in the ____ of matter
When energy changes from one form to another, it is called energy
A.radiations
B.transmissions
C.solutions
D.transformations
Answer:
(see below)
Explanation:
Using the process of elimination:
It's not energy radiations because radiation is a way energy is transferred.
It's not energy transmissions because that's the transfer of energy from one medium to another, like the sun to a black construction paper through radiation. There are three ways of transmission: radiation, convection, and conduction.
It's not solutions because a solution is a homogenous mixture where it is uniform in composition and appearance throughout. Also, the term "energy solutions" makes no sense whatsoever.
It's most likely energy transformations because energy transformation, also called energy conversion, is the process of changing energy from one form to another.
Concentrated hydrochloric acid has a molarity of 12.0 mol/L. What volume of it do you need to
make 1.5 L of a 0.50 mol/L solution?
Answer:
0.063 L
Explanation:
The dilution formula is M₁V₁ =M₂V₂, where M is mol/L and V is L.
We need to find V₁ so our equation is V₁ = M₂V₂ / M₁.
[tex]V1 = \frac{0.50M*1.5L}{12.0M} = 0.0625 L[/tex]
Round to the lowest significant figures = 0.063 L
what is the democritus findings?
nvm
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A block of lead displaces a volume of 27.9 mL. What is the mass of this block if the density of the lead is 11.34 g/mL?
Answer:
The answer is 316.39 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume of lead = 27.9 mL
density = 11.34 g/mL
We have
mass = 11.34 × 27.9 = 316.386
We have the final answer as
316.39 gHope this helps you
plss help meeeeeeee i need help
Answer:
D: dark cloud
E: elliptical galaxy
F: flare star
What is the macroscopic, nanoscopic, and symbolic level of sulfur?
Answer:
these are small organism that can not seen by naked eyes
plsssssss! help! 20 points
A sample of N2H4 has a mass of 25g. Identify the numerical quantity that is needed to convert the number of grams of N2H4 to the number of moles of N2H4. (You do not need to do the actual calculation.)
Answer:
Explanation:
molecular weight of N₂H₄ is as follows
2 x 14 + 4 x 1 = 32
so 32 gram of N₂H₄ is equal to one mole of N₂H₄
25 gram of N₂H₄ will be equal to 25 / 32 mole of N₂H₄
so numerical quantity needed to convert grams of N₂H₄ to mole is
1 / 32 or .03125 . This number needs to be multiplied with grams of N₂H₄
to convert it to number of moles.
Answer:
The answer is molecular mass.
Explanation:
In order to convert grams to moles. you have to find the molar mass of N2H2.
Which lists the fractions 4/7 5/9 and 2/3 in order from least to greatest
Which is a form of matter?
A. electricity
B. energy
C. light
D. water
Answer:
D
Explanation:
Water is a liquid
Answer:b energy
Explanation: i hope its right
What do you call all water on earth surface
Answer:
Hydrosphere
Explanation:
Hydrosphere includes all water on the surface of the planet.
Answer:
Hydrosphere
Explanation:
cuz i said so
what causes the lithospheric plates to move
Answer:
The heat from the Earth's cores radioactive process makes the lithospheric plates move sometimes away or toward each other.
Hope it helps :)
Answer:
convection currents in the mantle
Explanation:
Convection currents in the mantle are always moving, and make the plates move too. The plates are resting on top of the mantle, which is where the convection currents are, which make them move along with the magma.
5. What volume of silver metal will weigh exactly 4500.0 g. The density of silver is 20.5 g/cm.
Answer:
The answer is
219.5 mLExplanation:
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
mass = 4500 g
density = 20.5 g/cm³
We have
[tex]volume = \frac{4500 }{20.5} \\ = 219.51219...[/tex]
We have the final answer as
219.51 mLHope this helps you
1.
Sabrina was asked by a classmate why she would place hydrogen in the first column of the periodic tab le. Which of the following reasons could she give as a response?
1. Hydrogen combines with chlorine in the same atomic ratio as sodium.
II. Hydrogen is a gas at room temperature.
III. Hydrogen forms diatomic molecules.
А A
I and II
B. Oll and III
COI only
D. Ill only
Answer:
The correct option is;
C. I only
Explanation:
Given that in a chemical reaction, the number of valence electrons in the outermost shell of an atom determines the ratio in which the atom combines with other atoms to have the stable 8 (octet) valence electrons in their outermost shell, we have that atoms in a group combines with atoms in other groups, where possible, in the same ratio.
Therefore, sodium, which is in the first column (group I) combines with atoms of elements in other groups, in the same ratio as atoms of the other elements of the column 1
Since hydrogen combines with chlorine in the same ratio as sodium which is from the first column, hydrogen is also an element from the first column.
Explain the differences between an element, a compound, and a mixture – how many different types of atoms can be found in each? How are the atoms arranged?
Answer:
An element is something sound in nature a compound is something with more then one specific atom and can be made or found in nature, and a mixture is a few different atoms that can be separated from each other
Ionic solids have high values of enthalpy of fusion. Why?
Which involves a chemical change?
1.separating hydrogen and oxygen from water
2.evaporating sugar from sweetened water
3.filtering sand from water
4.distilling pure water from salt water
Answer:
1
Explanation:
because you are changing the chemical makeup of the water by pulling out the two chemicals
Here you go rats....
Answer: Why exacly am i a rat
Explanation:
,....
but thanks
Answer:
what!!!??????