Answer:
A. Temperature or Pressure
Explanation:
Do which levels of organization do unicellular organisms not have? Explain why.
Answer:
Unicellular organisms do not have levels of organization. Unicellular organisms need fewer resources and some can live in harsh conditions. They are very small and are easily eaten by other organisms
Explanation:
Both “blank” and “ blank” use electric current and coiled wires to produce strong magnetic fields.
Answer:
electromagnet
Explanation:
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the center of the coil.
Please help me out with this
Answer:
number 3 i think
Explanation: im sorry if im wrong
Aristotle did not believe that
could exist.
Answer:
aristotle din not beileve in anything. he looked at the world describe what happend
You can tell if an unknown substance is an base because:
Answer:
if it is hydroxide
Explanation:
when metal. and non-metal most the time reacts and the none metal is hydroxide u can easily say it Is base
What Are the 3 building blocks of neutral fat molecules ?
Answer:
Gylcerol Back Bone
Carbons and Hydrogens
Explanation:
What letter represents the trough? :) PLEASE FAST!
1) A
2) B
3) C
4) D
Zn + __HCI → __ZnCl + _H2
I LOVE balancing chemical equations!
Answer:
2 Zn + 2 HCl -> 2 ZnCl + 1 H₂
Explanation:
These coefficients correct balance this equation.
Please add me as Brainliest, I need it to move onto the next level.
What state (solid, liquid, gas) is mercury in at the boiling point of water, 100°C? Explain.
Mercury is in a liquid state
Mercury's melting point is somewhere around -34 Degrees Celcius. Thus it should be assumed it will be a liquid at this temperature. Not a gas however as mercury's boiling point is somewhere in the 600 Degree range
One mole of any substance contains 6.022 × 1023 representative particles (atoms, molecules, ions, or formula units). A sample of silver metal consists of 4.26 nanomoles. How many silver atoms does it contain?
Answer:
it contains 2.56 x 10^15.
Explanation:
given no. of moles = 4.26 x 10^-9 atoms
one mole has 6.022 x 10^23 atoms
so it contains 4.26 x 10^-9 x 6.022 x 10^23 atoms
(If we suppose silver's atomic weight as 108.)
which arrow represents water forming outside a cold water bottle left outside
Answer:
The phase transition that represent the the cooling of gaseous water to form liquid outside a bottle left outside which is a process known as is represented by the arrow 2
Explanation:
The different phase transitions that occur in mater are;
1) A phase transition from the solid phase to the liquid phase which occur by heating, represented by the arrow 2 and the process is known as melting
2) A phase transition from the liquid phase to the gaseous phase which occur by further heating the liquid, represented by the arrow 1 and the process is known as evaporation
3) A phase transition from the gaseous phase to the liquid phase which occur by cooling the hot gas, represented by the arrow 2 and is known as condensation
4) A phase transition from the liquid phase to the solid phase which occur by further cooling the liquid, represented by the arrow 5 and the process is known as freezing
5) A phase transition from the solid phase to the gaseous phase which occur by heating the cold solid, represented by the arrow 3 and the process is known as sublimation
6) A phase transition from the gaseous phase to the solid phase which occur by cooling the gas, represented by the arrow 6
Therefore, the phase transition that represent the the cooling of gaseous water to form liquid outside a bottle left outside is represented by the arrow 2
The equation below represents the combination of gaseous atoms of non-metal X and of hydrogen to form gaseous X2He6 molecules. 2X(g) + 6H(g) → X2H6(g) AH = -2775 kJ mol The bond energy of an X-H bond is 395 kJ mol. What is the bond energy of an X-X bond? A - 405.0kJmol-¹ B -202.5kJmol-¹ C +202.5kJ mol-¹ D +405.0kJ mol-¹
Answer:
D +405.0kJ mol-¹
Explanation:
Since bond energy is the energy required to break a bond, the energy of dissociation of X₂H₆ = +2775 kJmol⁻¹.
Since there is one X-X bond and six X-H bonds,
Bond energy of one X-X bond + Bond energy of six X-H bonds = energy of dissociation of X₂H₆.
Since bond energy of one X-H bond = 395 kJ mol⁻¹, then
Bond energy of one X-X bond + Bond energy of six X-H bonds = energy of dissociation of X₂H₆
Bond energy of one X-X bond + 6 × one X-H bond = +2775 kJmol⁻¹.
Bond energy of one X-X bond + 6 × 395 kJ mol⁻¹ = +2775 kJmol⁻¹.
Bond energy of one X-X bond + 2370 kJ mol⁻¹ = 2775 kJmol⁻¹
Bond energy of one X-X bond = 2775 kJmol⁻¹ - 2370 kJ mol⁻¹
Bond energy of one X-X bond = +405 kJmol⁻¹
SC. 8.P.8.9
10. A water molecule is made up of one oxygen and two hydrogen atoms. Why is water considered a
pure substance?
licy yo
g atte
cour
your
A. Each water molecule has an identical composition and properties.
B. Water can be combined with other substances by physical means.
C. Water molecules are made up of different types of atoms.
D. Water cannot be broken down by physical means.
Answer:
C
Explanation:
how did rutherford interpret the fact that most of the ????α particles seemed to pass right through the foil?
Ernest Rutherford gave the atomic model based on the centrally located mass of the atom. The α particles passed through the foil as an atom has empty spaces.
What is Rutherford's atomic theory?Rutherford gave the atomic model by bombarding the gold foil with an alpha particle from radioactive material. It gave the atomic structure constituting the sub-atomic particles.
Most of the alpha particles passed straight through the foil which concluded that most of the space in the atom was empty and the major mass was accumulated at the center.
Therefore, the α particles passed straight as most of the atom has empty spaces.
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A pH of 1 there are a lot of ______ in a solution. 2.A pH of 14 there are a lot of ______ in a solution.
Answer:
Hydrogen or hydroxonium ions in the solution
Hydroxyl ions in the solution
Explanation:
A pH of 1 shows there is a lot of hydroxonium ions in the solution and a pH of 14 shows there is a lot of hydroxyl ions in the solution.
The pH scale ranges from 1 to 14 As the values tends towards 1, the acidity increases due to concentration of hydroxonium ions in the solution. As the pH tends towards 14, the basicity increases due to the concentration of hydrogen ions in the solution.What makes viruses so dangerous but vaccines so important? i am struggling lol
Answer:
viruses can kill you vaccines can save your life.
Explanation:
Answer:
The effect of leaky vaccines on how disease spreads is explained by the “imperfect-vaccine hypothesis”. It holds that, without vaccination, a very virulent virus can get into a population and kill infected hosts (people or animals) very quickly – before they have a chance to spread it. This means that the virus will die out very quickly too, as all potential hosts will be dead or immune to it.
Explanation:
a lever was used to lift a heavy rock the input force was 150 n and the output force was 500 n what was the mechanical advantage of the pulley
Answer:
Option A. 3.3
Explanation:
The following data were obtained from the question:
Input force = 150 N
Output force = 500 N
Mechanical advantage (MA) =.?
Mechanical advantage can be defined as force output divided by force input i.e
Mechanical advantage (MA) = force output / force input
With the above formula, we can obtain the mechanical advantage of the pulley as shown below:
Input force = 150 N
Output force = 500 N
Mechanical advantage (MA) =.?
MA = force output / force input
MA= 500/150
MA = 3.3
Thus, the mechanical advantage of the system is 3.3
Write the names of the following covalent compounds: no2
Answer:
nitrogen dioxide
Explanation:
this was on my chemistry test
A chemical reactions is shown. How many different elements and total atoms are involved in the reaction?
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, to determine the number of different element participating in a reaction, count the number of individual atoms participating the reaction. For example,
H₂SO₄ + 2NaOH ⇒ Na₂SO₄ + 2H₂O
The number of different elements involved in the reaction above are hydrogen (H), sulphur (S), oxygen (O) and sodium (Na). This means there are 4 different elements involved in the reaction.
But to determine the total number of atoms involved in a reaction, one must first ensured the reaction is balanced (because the number of each atom must be considered). Using the same reaction illustrated earlier hydrogen (H) has 2 atoms in H₂SO₄ and 2 atoms in NaOH, sulphur (S) has 1 atom in H₂SO₄, oxygen (O) has 4 atoms in H₂SO₄ and 2 atoms in NaOH and sodium (Na) has 2 atoms in NaOH. Thus, total number of atoms is 13 atoms.
Note that the number of atoms on the reactant side would be same as number of atoms on product side because of law of conservation of matter. Thus, participating atoms in the reaction is 13
complete the puzzle below by identifying the four type of speech context and two types of interpersonal communication evident in the presented situation
CHEMISTRY PLEASE HELP!! You have 45 grams of Carbon (C). How many moles of Carbon do you have? Use the drop down selections to help you fill in the table and solve the problem.
Answer:
3.75mole
Explanation:
Given parameters:
Mass of the carbon(C) = 45g
Unknown:
Number of moles of carbon = ?
Solution:
The number of moles of a substance can be found using;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of carbon = 12g/mol
Number of moles = [tex]\frac{45}{12}[/tex] = 3.75mole
Which best describes electromagnetic waves moving from gamma rays to radio waves along the electromagnetic
spectrum?
A) Wavelength and frequency decrease.
B) Wavelength and frequency increase.
C) Wavelength increases, and frequency decreases.
D) Wavelength decreases, and frequency increases.
Answer:
Wavelength increases, and frequency decreases.
for my lazy friends its letter C
Explanation:
e2021
The statement 'wavelength increases and frequency decreases' best describes electromagnetic waves moving from gamma rays to radio waves (option C).
What is wavelength?The term wavelength makes reference to the distance between the picks of the waves in the electromagnetic spectrum.
The wavelength and frequency can be used to understand the dynamics of electromagnetic waves.The frequency of a wave refers to the period of oscillation within an electromagnetic spectrum.In conclusion, the statement 'wavelength increases and frequency decreases' best describes electromagnetic waves moving from gamma rays to radio waves (option C).
Learn more about electromagnetic waves here:
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Can one mole of peas fit inside your house? List the materials and steps of an experiment that answers the
question without actually filling up your house with peas!
Answer:
No.
Explanation:
No, one mole of peas do not fit inside a house because one mole is equals to 6.022 × 10²³ units which is a very large value. mole only use for atoms, ions and molecules etc due to very small size but mole is not used for big sized materials such as peas and other vegetables etc. So that's why we can conclude that one mole of peas did not fit inside a house.
which
state
one
mose
in poverty?
Answer:
New Hampshire is the most in proverty.
Explanation:
I learned this before.
Answer:
Oklahoma state
Explanation:
please mark me as brainliest
How many moles of Ba(NO3)2 are there in 0.25 L of a 2.00 M Ba(NO3)2 solution?
Use Molarity equals StartFraction moles of solute over liters of solution EndFraction..
0.13 mol
0.50 mol
2.25 mol
8.0 mol
Answer:
0.5moles
Explanation:
Given parameters:
Volume of solution= 0.25L
Molarity of solution = 2.00M
Unknown:
Number of moles = ?
Solution:
To solve this problem;
Molarity is the number of moles of solute in a given volume of solution, so
Number of moles = molarity x volume
Now insert the parameters and solve;
Number of moles = 0.25 x 2 = 0.5moles
Answer:
b
Explanation:
got it right on test
How many molecules are in 0.0740 mol NH3?
Number of molecules NH₃ = 4.45 x 10²²
Further explanationA mole is a number of particles(atoms, molecules, ions) in a substance
This refers to the atomic total of the 12 gr C-12 which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles
Can be formulated :
N = n x No
N = number of particles
n = mol
No = 6.02.10²³ = Avogadro's number
mol of NH₃ = n = 0.074
So the number of molecules :
[tex]\tt N=n\times No\\\\N=0.0740\times 6.02\times 10^{23}\\\\N=4.45\times 10^{22}[/tex]
Which of the following is NOT a characteristic of metals that can be attributed
to the bonding and arrangement of atoms?
brittleness
ductility
malleability
electrical conductivity
the answer is Brittleness
The characteristic that is not present in metals that can be attributed to the bonding and arrangement of atoms is brittleness. The correct option is A.
What are metals?Metals are the chemical elements present in the periodic table. They are classified as metals because of their properties of reacting, softness and malleability, etc.
Some metals are iron, oxygen, magnesium, aluminum, etc. They are both solid, liquid, or gas. They are highly electrical or thermally conductive, ductile, and reflective.
On the other hand, non-metals are less reactive, very hard, and non-malleable. Brittleness is the quality of non-metals, not metals. Due to the brittleness of non-metals, they are not easy to the bonding and arrangement of atoms.
Thus, the correct option is A. brittleness.
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Joe compared an ice cube to the liquid water from the ice cube after it melted. Which of the following statements is an observation from the student's comparison?
O Both have a definite mass and volume, and both have a definite shape.
O Both have a definite mass and volume, but neither has a definite shape.
O Both have a definite mass and volume, but only the liquid water has a definite shape.
O Both have a definite mass and volume, but only the frozen ice cube has a definite shape.
Answer:
Both have a definite mass and volume, but only the frozen Ice cube has definite shape
Explanation:
Water(Liquid) Takes on the forms of other things, Such as cups
In which direction is this wave traveling?*
(1 Point)
A. up
B. down
C. to the left
D. to the right
Answer:up
Explanation:
Which force saves the atom by emitting particles from the nucleus?
Answer:
nuclear force
I hope this helps :)
Explanation: