Answer:
D number of protons or atomic mass
it is option c
no of nucleons
How much has the seafloor spread since Columbus sailed?
10 centimeters
10 meters
100 meters
10 kilometers
Answer:10 meters
Explanation:
because that what he speaded
pls help ill give brainliest
Answer:
The could watch for a Millard reaction (if the pie is cooked enough) and an endothermic reaction (if the pie burns)
Explanation:
Electromagnetic radiation with a wavelength of 575 nm appears as yellow light to the human eye. The energy of one photon of this light is 3.46 × 10 -19 J. Thus, a laser that emits of energy in a pulse of light at this wavelength produces ________ photons in each pulse.
Answer:
9.12 * 10^20 photons
Explanation:
Given that;
E=n⋅h⋅ν
Where;
E= energy of the electromagnetic radiation
n = number of photons
h = Plank's constant
ν = frequency of electromagnetic radiation
Hence;
n = E/hν
n = 3.46 × 10 -19/6.6 * 10^-34 * 575 * 10^-9
n = 3.46 × 10 -19/3795 * 10^-43
n= 9.12 * 10^20 photons
Give 4 clues that a chemical change has occurred.
Answer:
Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.8.5 x 10^-2 standard form
Answer:
Either
8.2
×
10
5
is already in standard notation
or you want
820
,
000
Explanation:
"Standard notation" is often used as a synonym for scientific nation, in which case the given format is already in standard notation.
However, some people use "standard notation" for what we might think of as "common form"
To convert from scientific notation to common form move the decimal point in the mantissa (in this case
8.2
) to the right the number of places indicated by
10
's exponent (in this case 5). [If the exponent is negative the decimal point will be moved to the left].
Please help! 20 Points!!!
Identify the substances that will appear in the equilibrium constant expression for the equation:
2 upper A g superscript plus (a q) plus upper Z n (s) double arrow upper Z n superscript 2 plus (a q) plus 2 upper A g (s).
Check all that apply.
Ag+
Zn
Zn2+
Ag
Answer:
I just did it home slice the first one's Ag+ and Zn2+ and the second one is A
Explanation:
I just did the assignment
Answer:
ag+ and zn2+
Explanation:
second question is A
In your own words, explain one part of the host's analogy.
Answer:
where is the text? i can only help you if i have the text or story. sorry.
Explanation:
Helppppp I give brainliest ‼️‼️‼️‼️‼️
The diagram below represents the electromagnetic spectrum with some of the regions labeled with letters. Visible light is represented by which letter
Answer:
its b
Explanation:
look up graphs online, an you'll see it
Which substances are bases? Check all that apply.
NaOH
KOH
H3BO3
NaCl
Ca(OH)2
Fe2O3
Answer:
Which substances are bases? Check all that apply.
NaOH ✔️
KOH ✔️
H3BO3
NaCl
Ca(OH)2 ✔️
Fe2O3
so (a) (b) and (e)
Explanation:
Nicl, is a yellow anhydrous salt. How many total atoms are found in one molecule of
NICI?
pls help :D
What is the chemical formula of NaCN?
Answer:
Sodium cyanide
Explanation:
Chemical formula: NaCN
Molar mass: 49.0072 g/mol
Appearance: white solid
Odor: faint almond-like
Sodium cyanide is the chemical name of NaCN. The naming scheme makes certain that each compound has a distinct and unmistakable identification.
Chemical naming, which is done in accordance with a set of standardised norms and conventions, is the process of giving names to chemical compounds. For scientists, these names act as a common vocabulary for discussing particular chemical compounds.
NaCN is the chemical name for NaCN. The binary compound represented by this formula is made up of the elements sodium (Na) and cyanide (CN). Chemical symbols are used to represent each element in a compound and to depict the compound's makeup as a whole.
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Your question is incomplete but most probably your full question was,
What is the chemical name of NaCN?
Choose the correct statements.
A. Elements are usually found in their pure form.
B. Four valence electrons is the most stable configuration.
C. The noble gases are
very stable.
D. A chemical bond is a strong attractive force between atoms.
Explanation:
C. Nobel gas are very stable because in their valance shell maximum number of electrons are present
Answer: option a,d
Explanation:
Just took the quiz
Help me pleaseeeeeee!!!!
The VOLUME of an irregular shaped object is to be determined by using the water displacement technique. When the irregularly shaped object is totally submerged the volume of water in a graduated cylinder increases from 10 mL to 15 mL. What is the volume of the irregularly shaped object?
Answer:
5 mL
Explanation:
When an object is completely submerged in a liquid , it displaces liquid equal to its volume . Therefore level of liquid is raised in a container containing liquid .
When the irregularly shaped object is totally submerged the volume of water in a graduated cylinder increases from 10 mL to 15 mL.
Initially volume of water contained = 10 mL
volume of water + volume of irregular shaped object = 15 mL
volume of irregular shaped object = 15 - 10 = 5 mL .
PLEASE HELP!!
George is writing an essay about the role of observation and inference in the development of the atomic theory. He wants to explain why it was more difficult to observe the presence of neutrons in atoms. Which statements should he include in his essay? Choose the two statements that apply.
A. While protons or electrons can be influenced by other charged particles, neutrons are not.
B. It was difficult to observe that neutrons were different than protons because the two particles respond to charge in the same way.
C. It was difficult to observe that neutrons were different than electrons because the two particles respond to charge in the same way.
D. Neutrons are held tightly together with protons in the nucleus, so scientists could not observe the behavior of neutrons independently.
Answer:
D and A
Explanation:
While protons or electrons can be influenced by other charged particles, neutrons are not.
and
Neutrons are held tightly together with protons in the nucleus, so scientists could not observe the behavior of neutrons independently.
Give the following compound's base name.
Answer:
2-Butyne
Explanation:
The given compound name is 2-Butyne.
According to the IUPAC rule, the compound is consist of 4 carbon atoms with triple bond at second carbon atom, so its name will be 2-Butyne or but-2-yne. 2-Butyne is an alkyne which is produced artificially at standard temperature and pressure.
Hence, the correct answer is "2-Butyne".
Which of the following sentences best describes what is shown in the above picture?
A.
a multicellular organism
B.
a single-celled organism
C.
a group of single-celled organisms
D.
cells of a multicellular organism
Answer:
The awnser is a single called organism
Explanation:
The above picture shows a a single-celled organism. Specifically, it is a protozoan with many cilia, which are the small white hair-like projections.
PLZ HELP I NEED IT ASAP
USING THE ELECTRON DOT DIAGRAM HOW MANY ELECTRONS DOES IT TAKE TO FILL UP THE SECOND SHELL OF AN ATOM?
Answer:
8
shell 1 =2
shell 2 =8
shell 3 =8
shell 4 =2
The most likely result of completely removing carbon dioxide from the environment of a plant
Answer:
we will all die bc plants make oxygen and and if we dont have oxygen then we die
Explanation:
Someone help me pls thank you
The solubilty product (Ksp) of PbCl₂ : Ksp = [Pb²⁺][Cl⁻]²
Further explanationGiven
PbCl₂ compound
Required
The solubilty product (Ksp)
Solution
Ksp is the product of ions in an equilibrium saturated state
For reaction :
AₓBₐ (s) ⇔ aAᵃ⁺ (aq) + b Bᵇ⁻ (aq)
Can be formulated :
Ksp = [Aᵃ⁺] ᵃ [Bᵇ⁻] ᵇ
For PbCl₂ :
PbCl₂(s)⇔Pb²⁺(aq) + 2Cl⁻(aq)
Ksp = [Pb²⁺][Cl⁻]²
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Answer: positive energy
Explanation: goggle it bro
How many grams of water, H20 are needed if 88
grams of CO2 gas are produced?
Answer:
Explanation:
If one mole of carbon monoxide has a mass of 28.01 g and one mole of carbon dioxide has a mass of 44.01 g , it follows that the reaction produces 44.01 g of carbon dioxide for every 28.01 g of carbon monoxide.
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
88.
88.0g C3H8 x (1 mol C3H8 / 44.0g C3H8) x (4 mol H2O / 1 mol C3H8) x (18.0g H2O / 1 mol H2O) = 144g H2O.
How many moles are in 88 grams of CO2?total mass co2 is 44 mass of given co2 is 88 in such a way nom of moles we get is 2. CO2 - ATOMIC MASS - 12 + 2 x 16 = 44 .
How many grams of C2H6 are required to produce 88 grams of CO2 when it is burned in the excess of oxygen?How many grams of C2H6 are required to produce 88 grams of CO2 when it is burned in the excess of oxygen? Explanation: 1 gram mole of C2H6 = 2 gram moles of CO2. Explanation: The number of each element is equal on both sides. 9.
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I’ll mark as brainliest
CaCO3 + 2HCl -> CaCl2+ CO2+ H2O
How much Carbon Dioxide will be produced if you start with 10g of Calcium Carbonate ?
please help me to answer this question
First, let's count mole of 10 g Calcium Carbonate
mole = Mass / Molecular Mass
Calcium Carbonate = CaCO₃
Molecular Mass = Ar Ca + Ar C + (3 x Ar O)
Molecular Mass = 40 + 12 + (3 x 16)
Molecular Mass = 100
next
Mole of CaCO₃ = 10 gram / 100
Mole of CaCO₃ = 0,1 mol
then equal the reaction equation first
CaCO₃ + 2 HCl ==> CaCl₂ + CO₂ + H₂O (Equal)
To count the mass of carbon dioxide that produced we must know the mole of CO₂ first
we can count by coefficient comparison
mole CO₂ = [tex]\frac{coefficient \ of \ CO_2}{coefficient \ of \ CaCO_3}[/tex] x mole CaCO₃
mole CO₂ = (1/1) x 0,1 mole
mole CO₂ = 0,1 mole
so
Mass of CO₂ = mole CO₂ x Molecular Mass of CO₂
Mass of CO₂ = 0,1 mole x (12 + (2 x 16))
Mass of CO₂ = 0,1 mole x 44
Mass of CO₂ = 4,4 g
so, mass of carbon dioxide that's produced by 10 g of calcium carbonate on reaction with chloride acid is 4,4 g.
Define the law of conservation of mass and what do we do in order to follow the conservation of mass
Answer: The Law of Conservation of Mass
In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction. If we account for all reactants and products in a chemical reaction, the total mass will be the same at any point in time in any closed system.
In a chemical reaction, mass can neither be created nor be destroyed.
What is the name and formula of Calcium & Antimony
Answer:
Ca3Sb2Antimony--calcium (2/3) | Ca3Sb2 - PubChem.Explanation:
I hope it's help
An investigation into an unknown object in space resulted in the following observations:
It is made of rock.
It has a round shape.
What additional piece of information is required to confirm that the object is an asteroid?
It gives off light.
It has a tail of dust and gas.
It orbits the sun.
It rotates on its axis.
An investigation into an unknown object in space resulted in the following observations: It was discovered to be an asteroid, It revolves around the sun, which is in the third position.
What is an asteroid?It is a small, rocky substance that rotates around the sun and is found in the asteroid belt, which is located between the orbits of Mars and Jupiter, and its size varies, with some still in fragments and others having a large structure.
Hence, an investigation into an unknown object in space resulted in the following observations: It was discovered to be an asteroid, It revolves around the sun, which is in the third position.
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does argon gain or lose electrons
Answer:
argon has no tendency to gain nor lose electrons.
Explanation: it's a noble gas
YOU GET 20 POINTS AND BRAINLIEST
A mole is:
a A mammal known for digging up gardens.
b A small, dark spot on the skin.
c A spy embedded within an enemy government.
d 6.02 × 1023 particles of a substance.
e All of the above.
Answer:
d because it seems correct
Explanation:
d
THIS IS DUE IN 20 MINUTES!!!!
Which of the following is an example of absolute dating?
A. A sedimentary rock layer is between 10,000 and 10,500 years old.
B. A sedimentary rock layer is younger than the existing layer below it.
C. A sedimentary rock layer is 20,000 years old because it is a scientific law.
D. A sedimentary rock layer contains fish fossils, but the layers above and below it do not contain any fossils.
Answer:
aa
Explanation:
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the correct option is option A.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.
So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. A sedimentary rock layer is between 10,000 and 10,500 years old. Sedimentary rock is a type of rock.
Therefore, the correct option is option A.
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