Answer:
Periodic Table
hope this helps
have a good day :)
Explanation:
The periodic table allows you to compare the elements and understand their properties.
What is periodic table?Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.
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Please help me ASAP State 2 uses of a retort
stand according to Chemistry
Answer:
2 uses of retort stand:
Retorts are used for distillation experiments (such as organic distillations) and titrations (where they hold a burette). They are also used as supports in filtration.The volume of a gas is 2250 mL at 290 kPa what will the volume be when the pressure is reduced to .9 atm
Answer:
7178.22 mL
Explanation:
Applying,
PV = P'V'................. Equation 1
Where P = Initial pressureof gas, V = Initial volume of gas, P' = Final pressure of gas, V' = Final volume of gas.
make V' the subject of the equation
V' = PV/P'.............. Equation 2
From the question,
Given: V = 2250 mL, P = 290 kPa, P' = 0.9 atm = (101×0.9) = 90.9 kPa
Substitute these values into equation 2
V' = (2250×290)/90.9
V' = 7178.22 mL
plz help me solve this question is it A,B,C or D
Hydrochloric acid reacts with sodium hydroxide to form sodium chloride (the salt) and water. Sodium chloride is made up of Na+ cations from the base (NaOH) and Cl- anions from the acid (HCl). HCl+NaOH→H2O+NaCl.
how many grams are in 3.0 moles of H2O
Answer:
18x3=54 gram
Explanation:
When you express molecular mass (in case of molecule)/atomic mass(in case of atom) in gram it will be equivalent to one mole. For example:
12 gram Carbon atom = 1 mole of Carbon atom = N number of Carbon atom
16 gram Oxygen atom= 1 mole of Oxygen atom = N number of Oxygen atom
32 gram Oxygen molecule (O2) = 1 mole of Oxygen molecule (O2) = N number of Oxygen molecule (O2)
similarly 1 mole of water is equivalent to molecular mass of water x 3 that is 18x3=54 gram. It would constitute 3N molecules of water.
N: Avogadro's number : 6.022140857 × 10^23
Organize the following list of atoms from highest to lowest Atomic Radius:
Sulfur, Aluminum, Sodium, Chlorine, Argon, Silicon
If a mineral has a mass of 20 and a volume of 4, What is its density?
Answer:
5 g/cm^3
Explanation:
Density of a substance= mass/ volume
Given:
volume = 4,
mass = 20
Assume volume is in cm^3
Mass is in "g"
Then substitute the values
Density of the substance=( 20/4)
= 5 g/cm^3
I have prepared a caffeine stock solution of 0.075 M. What volume should we mix with
distilled water in order to reach a standard solution of 0.0015 M and a final volume of 10
mL?
a) 0.2 mL
b) 112.5 mL
c) 50 mL
d) 2 mL
PLEASE HELP!
No Links!
I will award brainliest to the first person to answer
Answer:
I think 50 ml but I am not sure
sorry
The interaction of the skeletal and muscular systems to create movement and locomotion is regulated by which organ system?
Answer:
The muscoloskeletal system
Explanation:
The musculoskeletal system is made up of the body's bones (the skeleton), muscles, cartilage, tendons, ligaments, joints, and other connective tissue that supports and binds tissues and organs together. Its primary functions include supporting the body, allowing motion, and protecting vital organs.
Please help me on this question
Most of the electricity that is used in everyday life comes from________ current.
Fill in the blank
Answer:
electric is your answer :)
Explanation:
Edge STEM instruction/assignment perhaps???
Answer:
A. C (alternate current)
A physics experiment is conducted at a pressure of 14.0 kPa. What is this pressure in mmHg?
Answer:
18.4 mmHg. The answer is 18.4 mmHg.
10. A community currently uses coal to produce electricity. What would be an
advantage of using nuclear energy instead? *
a. Uranium is safer than coal
b. Nuclear energy produces no waste
c. Uranium deposits are more abundant than coal
d. Nuclear energy does not produce greenhouse gases
Answer:
c
Explanation:
I'm pretty sure it's C. If it is not then it might be d
Please help with this , thanks you guys very much
Answer:
I am giving u some explanation related this question pls see that
it may help u
Explanation:
The pH scale measures how acidic an object is. Objects that are not very acidic are called basic. The scale has values ranging from zero (the most acidic) to 14 (the most basic). As you can see from the pH scale above, pure water has a pH value of 7. This value is considered neutral—neither acidic or basic. Normal, clean rain has a pH value of between 5.0 and 5.5, which is slightly acidic. However, when rain combines with sulfur dioxide or nitrogen oxides—produced from power plants and automobiles—the rain becomes much more acidic. Typical acid rain has a pH value of 4.0. A decrease in pH values from 5.0 to 4.0 means that the acidity is 10 times greater.
How pH is Measured
There are many high-tech devices that are used to measure pH in laboratories. One easy way that you can measure pH is with a strip of litmus paper. When you touch a strip of litmus paper to something, the paper changes color depending on whether the substance is acidic or basic. If the paper turns red, the substance is acidic, and if it turns blue, the substance is basic
Another term for natural radioactive decay into another element is
Answer:
The process of unstable (or radioactive) atoms becomes stable by emitting radiation. This event over time is called radioactive decay. Alpha decay results in the loss of two protons and two neutrons from the nucleus
Answer:
radioactive disintegration
Explanation:
The body system that transports molecules to and from all cells of the body
Answer:
El sistema cardiovascular tiene como función distribuir los nutrientes y el oxígeno a las células del cuerpo y recoger los desechos metabólicos para después eliminarlos en los riñones a través de la orina, y por el aire exhalado en los pulmones. El sistema cardiovascular comprende el corazón, que actúa como una bomba que mantiene el conjunto en funcionamiento, los vasos sanguíneos (arterias, venas y capilares), que son los conductos que transportan la sangre y, la sangre, que es el líquido fluido que contiene las células producidas por la maduración de las células madre de la médula
Na2S(aq)+Cd(NO3)2(aq) 2NaNO3(aq)+CdS(s)
Sodium sulfide is the limiting reactant. Select the substances that are found in the test tube after the reaction has ended.
A) Na2S
B) Cd(NO3)2
C) NaNO3
D) CdS
Explain the reason that the atomic emission spectrum of hydrogen contains only four lines.
A)
The hydrogen atoms form a continuous series of quantized energy levels
that transmute at a variety of frequencies.
B)
Hydrogen atoms contain a limited number of quantized energy levels that
emit radiation at a limited number of frequencies.
C)
Many hydrogen atoms accomodate an array of quantized energy levels that
can release energy at a progression of frequencies.
A hydrogen atom consists of a sequence of quantized energy levels that
incorporate radiation only from consecutive frequencies.
D)
Answer:
Though a hydrogen atom has only one electron, it contains a large number of shells, so when this single electron jumps from one shell to another, a photon is emitted, and the energy difference of the shells causes different wavelengths to be released... hence, mono-electronic hydrogen has many spectral lines.
Explanation:
thank me later
The reason that the atomic emission spectrum of hydrogen contains only four lines is the hydrogen atoms form a continuous series of quantized energy levels that transmute at a variety of frequencies.
What is atomic emission spectrum of hydrogen?The emission spectrum of hydrogen consist of numerous spectral series, the wavelength is postulated by Rydberg formula.
The reason behind the lines of spectrum is the transition of electron between two energies.
Thus, the correct option is A.
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PLEASE HELP
Which chemical reaction supports the Law of Conservation of Mass?
Answer:A
Explanation:
How many grams of NaCl are in 1.25 X 1024
molecules of Naci? Use one decimal place
Answer:
121.1g
Explanation:
First, we need to convert the number of molecules of NaCl to moles (n) by dividing by Avagadro number
That is, n = number of molecules ÷ 6.02 × 10²³
n = 1.25 X 10²⁴ ÷ 6.02 × 10²³
n = 1.25/6.02 × 10^ (24-23)
n = 0.207 × 10¹
n = 2.07moles
Using the formula; mole = mass ÷ molar mass
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
mass = molar mass × mole
mass = 58.5 × 2.07
mass = 121.1g
Which of the following is NOT TRUE for both mitosis and meiosis?
a they both preceded by interphase
b. they both split cells thru cytokinesis
c. they divide according to a common pathway
d. they are both involved in the division of somatic cells
Answer:
d. they are both involved in the division of somatic cells
Explanation:
Mitosis and meiosis are both types of cell divisions that occur in the system of living organisms. However, mitosis and meiosis are different in the type and number of daughter cells they give rise to and also where they occur.
Mitosis, which takes place in the SOMATIC OR BODY CELLS of living organisms, give rise to two daughter cells that are genetically identical to their parent cell. On the other hand, meiosis takes place strictly in the CELLS OF REPRODUCTIVE ORGANS, and gives rise to four genetically different daughter cells.
which one of these three elements conatain the most protons
A.copper
B. radon
C. sodium
Answer:
i think it's B sorry if i'm wrong
where do fossils live
What is diffusion? How does the motion of gas molecules explain how a gas diffuses throughout a room?
Answer:
Diffusion in gases
Diffusion is driven by differences in concentration. When chemical substances such as perfume are let loose in a room, their particles mix with the particles of air. The particles of smelly gas are free to move quickly in all directions
Explanation:
hope this helps
Can the excess reactant control the percentage yield
Explanation:
when one reactants is in excess, there will always be some left over. The other reactants becomes limiting factor and controls show much of each product is produced.while using excess percentage yields this is at the expense of atom economy.
How many grams of LiF are needed to make 87 g LiF solution into a
34.5% solution?
solution?
answer options:
30 g LIF
0.01 g LIF
45.8 g LIF
0.02 g LIF
Answer: 30 g LiF
Explanation:
Pick the MAIN output form of energy.
A snail eating a carrot so the snail has energy to move.
Electrical Kinetic Energy
Motion Kinetic Energy
Chemical Potential Energy
Thermal Kinetic Energy
Motion Potential Energy
Nuclear Potential Energy
Answer:
Chemical Potential Ener
In the equation C H4 + O2 C O2 + H2 O, what are the products?
A) C H4 + H2 O
B) C O2 + H2 O
C) O2 C O2
D) C H4 + O2
Answer:
Option B clearly shows the Products of the reaction
Mole ratios used for conversions come from?
CI2+NaOH⇒NaCI+NaOCI+H20
is there a way to balance this?
A Starting substance in a chemical reaction is called a _______________.
1. reactant
2. product
3. chemical reaction
4. physical reaction
Answer:
1.)REACTANT
These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.