Answer:
4 significant figures
Explanation:
505 has 3 significant figures
450.25 has 5 significant figures
First do simple subtraction
505 - 450.25 =54.75
And then evaluate any number that has significance or is important if the decimal were to be moved.
4 significant figures
8.In a solution, this is what you have the least of.
(1 Point)
Solvent
Solute
Solubility
Suspension
Answer:
Solute
Explanation:
A solution is made up of combination of solute and solvent.
The solute is the solid dissolved in a solvent.
Solutions are homogeneous mixtures of solutes and solvents.
In a solution the solutes are evenly distributed in the solvent. The solute is the substance dissolved to make the solution. It is usually present in smaller amount than the solvent. The solvent is the dispersing medium.Which of the following is NOT
an example of an atom?
A. A water molecule
B. The smallest part of oxygen
C. The smallest part of helium
Answer:
The answer is neither
Explanation:
All of the following things all have atoms in them therefor,its neither.
Answer:
A. a water molecule
Explanation:
It’s for Acellus
Elements in Group 18 form which ion?
A. 1
B. +1
C. -1
D. 0
which type of rock is most likely to form because high heat and pressure?
Answer:
metamorphic
Explanation:
PLEASE HEP QUICK!! I'M BEING TIMED!!
1. _____ - the phase change in which a substance changes from a liquid into a gas.
25 points
Vaporization
Condensation
Heat of vaporization
Evaporation
2. _____ - the process that changes a substance from a liquid to a gas at temperatures below the substances boiling point.
25 points
Heat of vaporization
Vaporization
Evaporation
Condensation
3. _____ - the energy a substance must absorb in order to change from a liquid to a gas.
25 points
Vaporization
Evaporation
Heat of vaporization
Condensation
4. The arrangement of molecules in water becomes less orderly as water melts and _____ orderly as water freezes.
25 points
more
less
Other:
Answer:
Evaporation, conensation, Heat of vaporization, more
Explanation:
im pretty sure this is correct
Answer: create a question.
Explanation:
The electron configuration of an atom in the
ground state is 2-4. The total number of
occupied principal energy levels in this atom is
A) 1
B) 2
C) 3
D) 4
Answer:
2
Explanation:
The principal energy levels for an atom with a ground state electronic configuration is 2;
K L
2 4
Principal quantum number represents the main energy level in which the orbital is located or the average distance of the orbital in the nucleus.
The principal quantum number takes whole number values such; i.e;
n = 1, 2, 3, 4, 5
For the given on the principal energy levels are 2.
The total number of occupied principal energy levels in this atom is 2.
The energy levels are the locations where electrons are found and are
usually close to the nucleus. The energy levels 1s and 2s are involved and
occupied in the atom with a electronic configuration of 2-4 in its ground
state.
The 1s energy level has a maximum of 2 electrons which can fill it while the
2s energy level has a maximum of 8 electrons which can fill it.
This is why the total number of occupied principal energy levels in this atom
will be 2.
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Describe the octet rule.
Answer:
The octet rule is a chemical rule of thumb that reflects the observation that main group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.
Explanation:
How many atoms are found in the chemical formula below
Nac
4.
3
2
1
Can y’all help me please
Answer:
2 atoms
Explanation:
There are 2 atoms in element NaCl. This is because there is 1 atom of Na (sodium) and 1 atom of Cl (chlorine) in each NaCl molecule. Elements by themselves do not have a "number of atoms"- if you're talking about the atomic number, it's the number of protons (or electrons in a neutral atom) of an element.
A student writes Ba²⁻ as the symbol for a barium ion. Explain what is incorrect about the symbol.
The symbol of barium ion is Ba²⁺. Barium looses two electrons and get positively charge, and it became cation.
What is cation ?Positively charged ions are known as cations. Negatively charged ions are referred to as anions. A charged atom or molecule is an ion. A balanced atom will change into a positively charged cation if one or more of its electrons are lost.
Because they are positively charged and move toward the negative electrode in an electrical field, these ions are referred to as "cations."
The barium ion has a charge of 2+, or a positive charge of two. To become a positively charged ion known as a cation, the barium ion must give up two electrons. Atoms replicate the electron configuration of the closest noble gas by transforming into ions.
Thus, To become a positively charged ion known as a cation, the barium ion must give up two electrons.
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which of the following is correct?!!
HELP QUICK 20 points
Answer:
Deep sea trenches
Explanation:
A(n)
______ Is a group of organs that work together to perform a com
Answer:
an organ system Is a group of organs that work together to perform a com
Explanation:
that is the answer organ system
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What are three ways to identify a substance?
Answer:
based on texture/ feel, oder/smell, melting/boiling point
Explanation:
Answer:
Smell it, drink it, throw it at someone.
Explanation:
If none of that hurts or kills anyone, you can mark everything that would off the list.
HOW MANY MOLES ARE IN 2.6 X 1024 ATOMS OF SILICON?
Answer:
Let x moles of silicon contains 2.8x10^24 atoms. 6.02x10^23 atoms are present in 1 mole of Si. Therefore 2.80x10^24 atoms are present in = 2.8x10^24/6.02x10^23 = 4.65 moles of Si.
Explanation:
Temperature and kinetic energy have a relationship.
Answer:
[tex]\boxed {\boxed {\sf Temperature=Average \ kinetic \ energy}}[/tex]
Explanation:
Temperature is also known as the average kinetic energy in a substance.
If there is an absence of heat in a substance, the particles move slower and the kinetic energy decreases. The temperature will be lower, because there is less kinetic energy.
If heat is present or applied, the particles move more, so kinetic energy increases. The temperature will be higher, since there is more kinetic energy.
So, the relationship is: temperature is the measure of average kinetic energy.
Answer:
DIRECT
Explanation:
How much energy is needed to turn 23 g of water completely into steam if it starts at a temperature of 8.0oC?
Answer:
69% energy
Explanation:
5. The diagram helow represents a particle traveling
through an electric field.
Positively
charged
plate
Particle -
+ + + + +
I
Negatively
charged
plate
Which particle remains undeflected when passing
through this electric field?
A) proton
B) electron
C) neutron
D) positron
Answer:
C) neutron
Explanation:
The particles that remains undeflected when passing through this electric field are the neutrons because they do not carry any charges on them.
Neutrons are uncharged particles. Since they do not have any charges on them, they are not affected by the electric field. Both protons and electrons are deflected by the electric field. The charges on these particles causes them to be deflected.The particle which remains undeflected when passing through this electric field is:
C) neutronThe given diagram shows the particle traveling through a field and there are positively, negatively and neutral charged ions.
As a result of this, we can see that the neutron does not get deflected as it is passing through the electric field because they do not have any charge in them and as such cannot be drawn by the electric charge.
Therefore, the correct answer is option C
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Which of these equalities is not correct?
a. 100 cg = 18
c. 1 cm3 = 1 mL
b. 1000 mm = 1 m
d. 10 kg = 1g
Answer:
a. 100 cg = 18
is wrong
Explanation:
Marcy creates a model that compares elements and compounds. Her model is shown.
Which statement can Marcy support with her model?
An element is highly reactive, and a compound is stable.
An element can exist in any state, and a compound can only be liquid.
An element contains multiple substances, and a compound contains only one pure substance.
An element is made of a single type of atom, and a compound is made of two or more atom types.
Answer:
Explanation:
the asnwer is acceleratiin
15. Why do many substances dissolve easily in water?
Answer:
Water is called the "universal solvent" because it is capable of dissolving more substances than any other liquid. ... Water molecules have a polar arrangement of oxygen and hydrogen atoms—one side (hydrogen) has a positive electrical charge and the other side (oxygen) had a negative charge
Explanation:
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[tex]\huge\mathfrak {♚Answer:-}[/tex]
Water is called the "universal solvent" because it is capable of dissolving more substances than any other liquid. Water molecules have a polar arrangement of oxygen and hydrogen atoms—one side (hydrogen) has a positive electrical charge and the other side (oxygen) had a negative charge
Atoms of the halogen family of elements typically _____ when they react.
A.give up one electron
B.gain two electrons
C.gain one electron
PLS HELP I DONT UNDERSTAND
Answer:a
Explanation:i think its a
What are different things you need to know before performing a experiment ?
A student found that 3 grams of ammonia gas formed 3 grams of solid ammonia when the
temperature was lowered enough. Why did the solid ammonia and the ammonia gas have the same
mass?
Answer:
a gas can have the same weight as a solid
Explanation:
Which evidence suggests that the materials in the asthenosphere are near their melting point? Choose the correct answer.
The asthenosphere is made of lighter elements.
The temperature of core samples taken from the asthenosphere is near 500 K.
The velocity of seismic waves increases suddenly when they enter the asthenosphere.
The velocity of seismic waves decreases suddenly when they enter the asthenosphere.
Answer: The asthenosphere is made of lighter elements.
Explanation:
The asthenosphere has obtained its name from Greek word called asthenis, which mean weak. The strength of asthenosphere is lower than that of overlying lithosphere. If the temperature of lithosphere raises high enough then asthenosphere will melt. This layer is ductile and deforms very easily.
Why do warm currents begin near the equator?
1. Ecuador recieves the most direct sunlight.
2. Scientists are not sure yet.
3. All currents, warm and cold, begin near the equator.
4. Because cold air rises and hot air descends.
Answer:
I would go with A
Explanation:
Because the earths equator is warmed by most direct rays of the sun, air a the equator is hotter than air further north or the south. The hotter air rises up at the equator and as colder air moves in to take its place, the wind begins to blow and push the ocean into waves and currents
Answer:
A
Explanation:
Because the earths equator is warmed by most direct rays of the sun which make it warm and goes up and go to cold and go down to Antarctica and come back up warm because and the most direct rays.
someone help please :)
6.79 x 10⁶
Further explanationScientific Notation consists of 2 parts
1. the first part: the first digit followed by the decimal point
2. The second part: the power of 10 (the exponents).which shows the number of digits after the decimal point
To add/subtract, the exponents must be the same and then add/subtract the coefficient
convert the largest exponent[tex]\tt 7.2\times 10^6\rightarrow 72\times 10^5[/tex]
subtract the coefficients[tex]\tt =(72-4.1)\times 10^5\\\\=67.9\times 10^5\rightarrow 6.79\times 10^6[/tex]
Given 1.40 moles of gold (Au), how many atoms do you have?
Answer:
8.428 × 10²³ atomsExplanation:
The number of atoms of Au can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 1.40 × 6.02 × 10²³
We have the final answer as
8.428 × 10²³ atomsHope this helps you
what is radiation? like I don't know and then someone will answer they will know I'm dumb
Answer: Radiation is energy given off by matter in the form of rays or high-speed particles. ... Atoms are made up of various parts; the nucleus contains minute particles called protons and neutrons, and the atom's outer shell contains other particles called electrons.
Answer:
Radiation is energy given off by matter in the form of rays or high-speed particles. All matter is composed of atoms. Atoms are made up of various parts; the nucleus contains minute particles called protons and neutrons, and the atom's outer shell contains other particles called electrons.
Explanation:
My mom studies this so, if you have any other questions, feel free to ask me! <3
What is the energy of a wave having a frequency of 9.83 x 1013 Hz?
Answer:
9.95779 Hz
Explanation:
