Answer:
need points sorry
Explanation:
pls help me pls cuz i need a good grade
In your own words, explain in a simple and short way of what matter is, and how is it described.
Answer:
The basic thing that all things are made up of
Explanation:
Calculate the energy of a photon of light emitted from a hydrogen atom when an electron falls from level n
Answer: E
1
−
E
4
=
Δ
E
=
−
2.18
×
10
−
18
J
(
1
n
2
f
−
1
n
2
i
)
=
−
2.18
×
10
−
18
J
(
1
1
2
−
1
4
2
)
=
−
2.18
×
10
−
18
J
(
15
16
)
=
−
2.04
×
10
−
18
J
After you obtain the energy, then you can realize that that energy has to correspond exactly to the energy of the photon that came in:
|
Δ
E
|
=
E
photon
=
h
ν
=
h
c
λ
where
h
is Planck's constant,
c
is the speed of light, and
λ
is the wavelength of the incoming photon. Thus, the wavelength is:
⇒
λ
=
h
c
E
photon
=
(
6.626
×
10
−
34
J
⋅
s
)
(
2.998
×
10
8
m/s
)
2.04
×
10
−
18
J
=
9.720
×
10
−
8
m
=
97.20 nm
Explanation:
The majority of which type of dancing was created in African American communities? Tap Ballet Ballroom Swing. Plz help thx <3
Answer: if it’s a multiple choice then it should be swing dances
Explanation:While the majority of swing dances began in African American communities as vernacular African American dances, some influenced swing-era dances, like Balboa, developed outside of these communities.
Which of these metric prefixes represent 1000?
(A). Centi
(B). Ecto
(C). Kilo
(D). Milli
In an AP Chemistry laboratory, students were given two unlabeled beakers and told that one of the beakers contained 1.0g of solid CaCO3 and the other contained
1.0g of solid AgNO3. They were told to devise an experiment to identify which compound was which. A student did so by adding 50 mL of distilled water to each beaker. Describe the student's observations that allowed him to identify each compound.
When the student adds 50 mL of distilled water to each beaker, CaCO3 will not dissolve in water while AgNO3 will dissolve completely in water.
We have to recall that according to the solubility rules, the carbonates of group two elements are insoluble in water. The solubility rules offer a convenient way of predicting the solubility of a compound in water.
When the student adds 50 mL of distilled water to each beaker, CaCO3 will not dissolve in water while AgNO3 will dissolve completely in water. This is because, the carbonates of group two elements are insoluble in water.
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need help!!
Is the atomic number of an atom equal to the electrons in an atom
Answer:
YES.
Explanation:
The atomic number is the number of protons. Because the number of protons is EQUAL to the number of electrons, they're basically equal.
Why does sugar taste sweet
PLEASE EXPLAIN
Answer:
Because i comes from cane.
6. (04.02 MC) Two chemical reactions are shown:
A. Ca(OH)2 → CaO + H2O
B. 4K + O2 → 2K2O
Which statement is true? (4 points)
A) Both are synthesis reactions.
B) Both are decomposition reactions. C) A is a synthesis reaction, and B is a decomposition reaction.
D) A is a decomposition reaction, and B is a synthesis reaction.
A. Ca(OH)₂ → CaO + H₂O is a decomposition reaction
B. 4K + O₂ → 2K₂O is a synthesis reaction.
The correct answer to the question is Option (D) A is a decomposition reaction, and B is a synthesis reaction.
A decomposition reaction is a reaction in which a large compound is broken into two or more products for example:XY —> X + YA synthesis reaction is a reaction in which two or more substances combine to produce a single product. For exampleC + D —> CDWith the above information in mind, we conclude that:
A. Ca(OH)₂ → CaO + H₂O is a decomposition reaction
B. 4K + O₂ → 2K₂O is a synthesis reaction.
The correct answer to the question is Option (D) A is a decomposition reaction, and B is a synthesis reaction.
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Answer:
d
Explanation:
Which of the following is an organic compound?
sulfur oxide (SO)
sodium chloride (NaCl)
water (H 2O)
carbon monoxide (CO)
Answer:
Carbon monoxide (CO)
Explanation:
Organic compounds are generally any chemical compounds that contain "carbon-hydrogen bonds". Due to carbon's ability to catenate, millions of organic compounds are known. The study of the properties, reactions, and syntheses of organic compounds comprise the discipline known as organic chemistry.
during an earthquake, geologists use a machine called what
Answer:
sesimographs
Explanation:
Answer:
A seismometer
Explanation:
it measures seismic waves
Rocks and fossils leave evidence of the conditions that were present when they formed.
true of false
Wines are produced from fermentation of crushed grapes. What causes the either white or red color of wine
Answer:
The cause of the color "white" in wine is because the grape's skin is removed before fermentation.
The cause of the color "red" in wine is because the grape's skin is still intact while fermentation
A chemist heats a fixed amount of gas in a sealed glass container. Which law is the chemist most likely
investigating? (1 point)
O Charles's law, by seeing how changes in temperature affect the volume of the gas
O Charles's law, by seeing how changes in temperature affect the pressure of the gas
O Gay-Lussac's law, by seeing how changes in temperature affect the volume of the gas
O Gay-Lussac's law, by seeing how changes in temperature affect the pressure of the gas
The chemist is most likely investigating Gay Lussac's law. To study the changes in temperature affect the pressure of the gas when a fixed amount of gas is heated in a sealed glass container. Therefore, option (D) is correct.
What is Gay Lussac's law?Gay-Lussac's law states that when the volume of the gas is kept constant the pressure of a gas is directly proportional to the absolute temperature.
The mathematical expression of Gay Lussca's law can be written as follows:
P/T = k
It can be also represented as the pressure being directly proportional to the temperature of the gas.
P ∝ T (where V volume of gas is constant)
or
[tex]\frac{P_1}{T_1} =\frac{P_2}{T_2}[/tex]
Where P₁ and T₁ are the initial temperature and pressure of the gas. The P₂ and T₂ are the final temperature and pressure of the gas.
As the container is sealed on heating the volume of the gas will not change. On increasing the temperature the molecules of the gas acquire more and more kinetic energy. So the pressure of the gas will increase.
Therefore, the chemist is investing the Gay-Lussac's law by noticing how changes in temperature affect the pressure of the gas.
Learn more about Gay Lussac's law, here:
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which example is an electron carrier in its reduced form?
Bad , fad is the answer check
Can i get help im not really good at science
Answer:
Cause and effect, easy.
3. A baseball bat striking a baseball and sending it toward left field is an example
of energy transformation. True or false. Please help it’s due tomorrow!!!
Answer:
TRUE
Explanation:Write a balanced chemical equation for the standard formation reaction of gaseous hydrogen bromide (hbr)
[tex]\\ \sf\longmapsto H_2+Br_2\longrightarrow HBr[/tex]
Balanced equation[tex]\\ \sf\longmapsto H_2+Br_2\longrightarrow 2HBr[/tex]
On reactant side:-
H=2Br=2On products side
H=2Br=2The balanced chemical equation for the synthesis of hydrogen bromide is [tex]\rm H_2\;+\;Br_2\;\rightarrow\;2\;HBr[/tex].
What is a balanced chemical equation?The balanced chemical equation has been given as the reaction in which the number of atoms for each element on the product and the reactant side is equal.
The HBr has been formed with the reaction of the hydrogen and the bromine. The balanced chemical equation for the reaction has been:
[tex]\rm H_2\;+\;Br_2\;\rightarrow\;2\;HBr[/tex]
Learn more about the balanced chemical equations, here;
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1. Which of these is an agent of chemical weathering?
copper patina
iron oxide
acid rain
iron
Answer:
Test answers
1. Water carving out a limestone cave
2. Oxidation
3. Acid rain
(Got 100%)
Explanation:
The primary agents of chemical weathering are water, oxygen and acids. So acid rain is an agent of chemical weathering. Option C is correct.
Which are the agents of chemical weathering ?Water, and many chemical compounds found in water, is the main agent of chemical weathering. One of the most abundant rock-forming minerals, chemically reacts with water and water-soluble compounds to form clay.
Water contains many weak acids such as carbonic acid. The primary agents of chemical weathering are water, oxygen and acids.
These react with surface rocks to form new minerals that are stable in, or in equilibrium with, the physical and chemical conditions present at the earth's surface.
Hence, option C is correct.
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Indique cuáles son las unidades de la molaridad *
eq-g/m³
eq-g/L
mol/cm³
mol/L
Answer:
hm
Explanation:
which is larger 0.45 mol of a material or 2.75×10^23 of the same material?
Write the balanced equation!!
Acid-Base Reactions: HA + BOH → BA + H2O
Sulfuric Acid, H2SO4 (aq) + potassium hydroxide (aq) potassium sulfate (aq) + water (l)
Answer:
H2SO4 + 2KOH + K2SO4 + 2H2O
Explanation:
there are 2 potassium atoms on the left side so gotta balance that and 2 for the H in the KOH so we have to add a 2 for the hydrogen in H2O..I hope this is useful..
How much heat is required for 10 g of steam specific heat
capacity = 2.01 J/gºC) at 120°C to be heated to 160°C?
Answer:
145°C is allowed
Explanation:
step step by step explanation
PLEASE EXPLAIN what is glucose
Answer:
(Hope this helps can I pls have brainlist (crown)☺️)
Explanation:
Glucose is the most common form of sugar in the blood and the body's primary source of energy. Glucose is derived from the meals we eat or produced by the body from other chemicals. The circulation transports glucose to the cells. Several hormones, including insulin, regulate blood glucose levels.
a simple sugar that is a component of many carbohydrates and is a vital source of energy in living things.
Blood sugar, often known as glucose, is the most common sugar present in the body. It is your body's major source of energy and comes from the food you eat. Glucose is carried by your blood to all of your body's cells, where it is used for energy.
14. Which of the following is true of the nucleus?
(a) The nucleus is considered the control center of the cell.
(b) The nucleus contains all the cell’s DNA.
(c) All cells have a nucleus.
(d) all of the above
what kind of molecule is a polymer??
Answer:
macromolecules
Explanation:
Polymer is composed of molecules called macromolecules that have multiple of simpler chemical units called monomers.
what scientist is credited with formulating the octet rule
Answer:
The electron configuration of the neon atom. American chemist Gilbert Lewis (1875-1946) used this observation to explain the types of ions and molecules that are formed by other elements. He called his explanation the octet rule.
Which of the following best describes the relationship between a
mutation and a resulting change in the coat color of a mouse?
Answer:
A I think
Explanation:
How many silicon atoms are in a typical computer microchip (0.001 g of silicon)?
The number of silicon atoms in atypical computer chips(0.001g of silicon) is 2.14 × 10¹⁹ atoms
The atomic mass of silicon = 28.0855 amu
Using the mole concept that 1 mole = 6.022 × 10²³.
This number is called the Avogadro's number.
Therefore,
1 mole / 28.0855g of silicon contains 6.022 × 10²³ atoms of silicon
0.001 g will contain ? atoms of silicon
cross multiply
number of atoms of silicon = 6.022 × 10²³ × 0.001 / 28.0855
number of atoms of silicon = 6.022 × 10²⁰ / 28.0855
number of atoms of silicon = 2.14 × 10¹⁹ atoms
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If a car is moved 10 meters and 3 Newton's of force is needed to move the car, what amount of workhas
been done?
Work required = 30J
This is because work = F * x
F (Newton's force) = 3N
x (car moved) = 10m
Work = 3 * 10 = 30J