Answer:
option D generally higher
The pH of a solution is 7.0.
What is the pOH?
Enter
Answer:
4 i think
Explanation:
what is the chloride anion
Answer:
Cl-
Explanation:
When chlorine reacts with other substances, it usually forms the chloride ion (Cl-). This is because it has seven valence electrons, and in order to gain a full octet, it has to gain one electron (which has a negative charge). For example, when it reacts with Sodium (Na), the product is table salt (NaCl) because chlorine takes one electron from sodium and becomes Cl-. Sodium also becomes Na+, because it loses one electron.
How would you change the distance between two charged particles to increase the electric force between them by a factor of 25?
Answer:
reduce the distance by the factor of 5
How many grams of solid lithium hydroxide must be used to prepare 450
mL of 0.55M LiOH solution?
Answer:
Mass = 6.706 g
Explanation:
Given data:
Mass of lithium hydroxide = ?
Volume of lithium hydroxide = 450 mL (450/1000 = 0.450 L)
Molarity of lithium hydroxide = 0.55 M
Solution:
Formula:
Molarity = number of moles / volume in L
0.55 M = number of moles / 0.450 L
Number of moles = 0.55 M × 0.450 L
Number of moles = 0.25 mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 0.25 mol × 23.95 g/mol
Mass = 6.706 g
Why did it take 2,000 years for scientists to confirm some of Democritus's ideas about?
Answer:
Explanation:
because it took that long for them to think of one.
1 Volume of certain amount of a gas at 25°C and
100 cm Hg pressure is 80 mL. The gas is
expanded to 160 mL keeping the temperature
constant. Calculate the pressure of the expanded
Numericals based on Boyle's law
Answer:
P₂ = 50 mmHg
Explanation:
Given data:
Initial volume of gas = 80 mL
Initial pressure of gas = 100 mmHg
Final volume = 160 mL
Final pressure = ?
Temperature = constant
Solution:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
100 mmHg × 80 mL = P₂ × 160 mL
P₂ = 8000 mmHg. mL/ 160 mL
P₂ = 50 mmHg
The presence of dark matter is one piece of evidence that supports the Big Bang theory. Why is this substance called dark matter?
A. The term dark matter describes matter that is so dark in color that it is barely visible with observation instruments such as telescopes.
B. The term dark matter describes the vast areas of the universe where light cannot be seen.
C. The term dark matter describes black holes because they absorb light.
D. The term dark matter describes matter that cannot be seen because it does not give off light. It can only be detected by observing its gravitational effects on other types of matter.
THIS CLASS IS !!!!EARTH SCIENCE!!!!
The substance is called dark matter because the term dark matter describes matter that cannot be seen because it does not give off light. It can only be detected by observing its gravitational effects on other types of matter (option D).
What is dark matter?Dark matter in physics or astronomy are particles of matter that cannot be detected by their radiation but whose presence is inferred from gravitational effects.
According to this question, the presence of dark matter is one piece of evidence that supports the Big Bang theory.
However, this matter is called "dark" because it does not appear to interact with the electromagnetic field i.e. it does not absorb, reflect, or emit electromagnetic radiation and is, therefore, difficult to detect.
Therefore, the substance is called dark matter because the term dark matter describes matter that cannot be seen because it does not give off light. It can only be detected by observing its gravitational effects on other types of matter.
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Candi uses wires to connect a battery to a light bulb. She knows she has made a complete circuit because the light bulb lights up.
Candi's teacher gives her a wire that has a lot more resistance than the wires she used at first. Candi removes one of the original wires from her circuit and puts the high-resistance wire in its place. What effect will this most likely have on the circuit?
A.
Less current will flow, so the light bulb will be dimmer.
B.
More current will flow, so the light bulb will be brighter.
C.
The battery will have more voltage, so the light bulb will be brighter.
D.
The battery will have less voltage, so the light bulb will be dimmer.
Which object has unbalanced forces acting on it?
A leaf falling to the ground
A sweater on a store shelf
A fence around a garden
A letter in a mailbox
Answer:
A leaf falling to the ground.
Explanation:
The leaf is the only object in motion and is falling therefore the force of gravity is the unbalanced force.
The solubility of potassium chloride is 34 g KCl
100 g H2O
at 20C. What is the maximum amount of KCl that can
dissolve in 200 g of water at 20C?
Answer: When 20 grams of potassium chlorate, KClO3, is dissolved in 100 grams of water at 80 ºC, the solution can be correctly described as:, unsaturated
At approximately what temperature does the solubility of sodium chloride, NaCl, match the solubility of potassium dichromate, K2Cr2O7?, 60 ºC
Explanation:
FECl3+3NaOH=Fe(OH)3+NaCl
A. Synthesis
B. Decomposition
C. Combustion
D. Single Replacement
E. Double Replacement
What is needed for a wind farm to be effective
Answer:
for a effective wind farm you would need wind turbines a windy area a rotation powered generator and something to use it on
Explanation:
a student walks 3.0 hours and travels 6.0km what is the averge speed
Answer:
2.0 km/hr
Explanation:
6.0 km/3.0 hrs
= 2.0 km/hr
Hope this helps! :3
plz mark as brainliest!
What is the best way to
determine which brand of
paper towel is the
strongest when wet?
Answer:Bounty
Explanation:After being soaked, the Bounty towel held an impressive 43 ounces or 2.69 pounds.
Did this help?
d.v. hoyt, "an empirical determination of the heating of the earth by the carbon dioxide greenhouse effect", nature 282 (22 november 1979), 388 - 390.
The impact of a higher atmospheric carbon dioxide concentration on Earth's surface temperature has been the subject of numerous theoretical calculations1,2.
Estimates of the rise in Earth's surface temperature brought on by doubling the amount of carbon dioxide in the atmosphere typically fall between 0.7 and 2.9 °C. The temperature rises range from 0.096 to 0.40 °C for a 10% increase in carbon dioxide.All of these conclusions were reached through the use of theoretical models, ranging in complexity from one-dimensional investigations of the planetary radiation budget to three-dimensional general circulation models. Here, a novel solution to this issue is discussed, enabling the calculation of an empirical estimate of the heating of the Earth's surface caused by the greenhouse effect of carbon dioxide.This method suggests that the Earth only warmed by 0.40 °C or less between 1880 and 1970.
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what is the mass of 3.01 x 10^21 atoms of Co
Answer:
0.295 g Co
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
3.01 × 10²¹ atoms Co
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Co - 58.93 g/mol
Step 3: Convert
[tex]3.01 \cdot 10^{21} \ atoms \ Co(\frac{1 \ mol \ Co}{6.022 \cdot 10^{23} \ atoms \ Co} )(\frac{58.93 \ g \ Co}{1 \ mol \ Co} )[/tex] = 0.294552 g Co
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
0.294552 g Co ≈ 0.295 g Co
What is it called when electrons fall back down to their normal energy level and release a photon of light? (Please help I think its called a quantum leap but im not sure!!)
Answer: Photoelectric effect
Explanation:
20 POINTS. What happened to a Gas once thermal energy is removed. What happened to a Gas once Thermal energy is added? Be specific!
When thermal energy is added the gas will become more dense as the atoms come closer together and when thermal energy is added it becomes less dense as the atoms move apart
The electron configuration for Aluminum (Al) is 1s^2 2s^2 2p^6 3s^2 3p^1
How many electrons does aluminum have? and how many of those electrons are valence electrons?
A:11 and 1
B: 11 and 3
C:13 and 1
D:13 and 3
Answer:
Aluminum has 13 electrons with 3 electrons in its valence shell....
Hope it helpss....｡◕‿◕｡
Which element would most likely bond with lithium and form an ionic compound?
Answer:
(Please make sure to re-write this on your own to make sure that your teacher doesn't think your cheating!) Fluoride.Explanation:Ionic bonding is the type of bond that is made between a nonmetal and a metal. In this type of union, one of the elements yields electrons and the other accepts electrons.
In this case, the metal is Lithium, we need a nonmetal to complete the union. (Don't know if you need this or anything but here you go)
Beryllium is a metal.
Calcium is a metal.
Fluoride is a nonmetal.
Sodium is a metal.
After the analysis, we conclude that the correct answer is Fluoride since it is the only one that is a nonmetal.
I need help with this quickly! thank you ;-;
Answer:
The second choice and can i have brainiest
Explanation:
What is the energy of a photon with a 6 micrometer wavelength (1 m = 10^6micrometers)?
O 3 x 10-34 )
O 3 x 10-32
O 3 x 10-20 ]
O 3 x 10-20 j
The energy of a photon : 3 x 10⁺²⁰
Further explanationRadiation energy is absorbed by photons
The energy in one photon can be formulated as
[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]
Where
h = Planck's constant (6,626.10⁻³⁴ Js)
f = Frequency of electromagnetic waves
f = c / λ
c = speed of light
= 3.10⁸
λ = wavelength
Wavelength of photon=λ=6 μm = 6.10⁻⁶ m
[tex]\tt E=h\times \dfrac{c}{\lambda}\\\\E=6,626.10^{-34}\times \dfrac{3.10^8}{6.10^{-6}}\\\\E=3.3\times 10^{-20}~J[/tex]
Elena makes the table below to determine the number of atoms of each element in the chemical formula 3(NH4)2SO4. A table with 3 columns and 4 rows. The first column labeled element has entries nitrogen, hydrogen, sulfur, oxygen. The second column labeled calculation has entries 1 times 2 times 3 , 4 times 2 times 3, 1 times 4 times 3, 4 times 3. The third column labeled total atoms has entries 6, 24, 12, 12. What mistake did Elena make? She should not have multiplied the sulfur atoms by the subscript 4. She should not have multiplied the nitrogen atoms by the subscript 2. She should not have multiplied the oxygen atoms by the coefficient 3. She should not have multiplied the hydrogen atoms by the coefficient 3.
Answer:
c
Explanation:
because i got 100 on the quiz
Answer: A) She should not have multiplied the sulfur atoms by the subscript 4
Explanation: got an 100 on the quiz:)
Which layer will be the ether layer in a separatory funnel containing diethyl ether and a saturated aqueous solution of nacl?.
The bottom layer will be the ether layer
a mixture in which the solute dissolves until it is no longer able to do so, leaving the undissolved components at the bottom. Solution without saturation. a solution that totally dissolves and leaves nothing behind (but has less solute than the saturated solution) A saturated solution is one that has as much of the solute present as is capable of dissolving. A solution is said to be unsaturated if it doesn't contain all of the solute that can dissolve in it. A saturated solution is one that has as much solute in it as can be dissolved under the circumstances under which it is present.
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HELP! why is the aqueous environment of a cell important?
it prevents organelles in a cell from sticking together.
it allows cells to bend and change shape as needed.
it provides a constant energy source for a cell.
it's required for all chemical reactions in a cell.
The aqueous environment of a cell is important because it allows cells to bend and change shape as needed (Option B).
What is the cell aqueous environment?The cell aqueous environment is the surrounding medium which is required for the cell to perform its metabolic activities and whose solute concentration allows the cell to change its shape depending on external stimuli such as glucose level.
In conclusion, the aqueous environment of a cell is important because it allows cells to bend and change shape as needed (Option B).
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Answer: it's required for all chemical reactions in a cell.
Explanation: took the test. please vote :-)
Chemical ____ are used to represent compounds
Answer:
Its formula :)
Explanation:
hope this helps <3
Which of the following elements has the largest atomic radius (brainliest for right answer)
Aluminum
Silicon
Phosphorus
Sulfer
Chlorine
Which compound is covalently bonded?
Select one:
a. Al2O3 b. Fe2O3 c. SO2 d. CuCl2
Answer:
The answer is D-CuCl2
I hope this helps
Answer:
D.
CuCl2
Explanation:
May it will help you.
Once the food reaches the esophagus in the digestive system, the biggest difference between the frog and the human digestive system is that after the large intestine, waste is eliminated through the
Answer:
The rectum
Explanation:
Another element, Z, in the same period of the Periodic Table as A, reacts with chlorine to
form a compound with empirical formula ZCl 2. The percentage composition by mass of ZCl 2
is Z, 31.13; Cl , 68.87.
Calculate the relative atomic mass, Ar, of Z.
The relative atomic mass, Ar, of the element Z is 32.1.
What is the relative atomic mass of the element Z?The relative atomic mass of the element Z is determined as follows:
compound formed between Z and Cl is ZCl₂
This implies that Z is an element in group 2A of the periodic table
percentage composition by mass of the elements in ZCl₂ are given as follows: Z = 31.13; Cl = 68.87
atomic mass of Cl = 35.5
mass of Cl in the compound = 35.5 * 2 = 71.0
68.87% of the compound has a mass = 71.0 g
mass of the compound (100%) ZCl₂ = 71.0 * 100/68.87
mass of the compound ZCl₂ = 103.1
Relative atomic mass, Ar, of Z = 103.1 - 71
Relative atomic mass, Ar, of Z = 32.1
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