Answer:
mass number
Explanation:
yeah mass number is the total of protons and neutrons
for example carbon has 12 proton and 12 neutrons therefore it's mass number is 24
i hope this is what you're looking for
What was the continental drift called before it separated
Answer:
Pangaea
Explanation:
Iron has a density of 7.87 g/cm^3. What volume would 12.5 g of iron occupy?
Answer:
The answer is 1.59 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question
mass = 12.5 g
density = 7.87 g/cm³
We have
[tex]volume = \frac{12.5}{7.87} \\ = 1.588310038...[/tex]
We have the final answer as
1.59 cm³Hope this helps you
Amphetamine was developed initially as a substitute for a closely-related chemical derived from the Chinese herb ma huang. That chemical is:
Amphetamine was developed initially as a substitute for a closely-related chemical derived from the Chinese herb ma huang. That chemical is Ephedrine.
What is Ephedrine?Ephedrine is a stimulant medication that can be considered an amine chemical compound and substituted amphetamine.
Ephedrine is used in sports to stimulate the central nervous system (C_NS) and as energy supplier.
Ep_hedrine use is prohibited and chronic usage of this substance may have problems the health.
Learn more about Ephedrine here:
https://brainly.com/question/1122074
Why don't objects warm up at equal speeds/rates?
Spindle fibers pull omologous pairs to ends of the cell 4 haploid daughter cells from
What is the mass of 4.0 moles of sodium, Na?
– previous question: “how many atoms are present in 4.0mol of sodium?” = 2.4 x 10^24 atoms of Na in 4.0 moles.
need an explanation of how to figure this out (& info on how to do this in other problems as well, thank you) <3
Answer:
91.60 grams
Explanation:
For this specific problem, you are asked to find the weight of an element, when given moles. Other problems could give you a compound. In each case, you need to find the molar mass of the element or compound, that is, the weight (in grams) of 1 mole of the element or compound. Now that you know the molar mass of the element/compound, you can multiply by the amount of moles the equation the equation gives you to find the total weight.
In this problem, you are asked to find the mass of Sodium (Na). First, we need to look on the Periodic Table to find the Atomic Mass of Sodium. If we look, we find this to be 22.990 amu. Side note - when we find molar mass, amu and grams are interchangeable - you'll see here. This 22.990 amu is also the molar mass in GRAMS of 1 mole of sodium. The equation asks us to find the mass of 4 moles of sodium, so now we simply multiply by 4. 22.990 * 4 = 91.60 grams.
In summary, find the molar mass (1 mole) of the substance, by adding the amu's of each element (keeping mind the amount of each). Then, multiply this total number by the amount of moles that is given, and put your answer in moles.
Hope this helps
Choose the atom with the larger first ionization energy.
Select one:
a. Silicon
b. Tin
Answer:
ACTUALLY the correct answer is
helium
why do we test for the presence of indole rather than pyruvic acid as the indicator of trytophanase activty
Which examples are possible environmental impacts of flooding? Select the two correct answers.(1 point)
reduction in tourism
groundwater recharge
damage to homes
damage to infrastructure
pollution of water supply
The two examples which are possible environmental impacts of flooding include:
Groundwater recharge.Pollution of water supply.What is flooding?Flooding can be defined as a geological process that typically involves the covering of earthen (soil) materials and the transportation of these materials by a natural force such as a large amount of water.
This ultimately implies that, flooding causes and has several environmental impacts on the physical environment due to the submergence of a dry land by a large amount of water, and these include the following:
Groundwater recharge.Pollution of water supply.Read more on flooding here: https://brainly.com/question/15663829
Answer:
The two examples which are possible environmental impacts of flooding include:
1. Groundwater recharge.
2. Pollution of water supply.
Explanation:
AgNO3 + Cu
How many oxygen atoms are present?
Write the steps for an IONIC BOND for KCI.
Answer:
Potassium chloride, KCl , is an ionic compound formed by the electrostatic force of attraction that holds the potassium cations and the chlorine anions together. Potassium, K , is located in group 1 of the Periodic Table.
Explanation:
thanks
How does the formation of water from hydrogen and oxygen demonstrate the conservation of mass?
Answer:
Well, the mass of the products is equal to the mass of the reactants.
Explanation:
The law of conservation of mass states that,
For any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system's mass cannot change, so quantity cannot be added nor removed.
Taken from here.
Suppose we have the balanced equation of combustion of hydrogen to form water.
The equation will be:
2H2(g)+O2(g)→2H2O(g)
Now, we look at the total mass of the reactants and compare it with the mass of the products.
H2 has a mass of 1⋅2 amu, and so 2H2 will have a mass of 2⋅2=4 amu.
O2 has a mass of 16⋅2=32 amu.
So, the total mass of the reactants (2H2+O2) is equal to 4+32=36 amu.
Now, let's take a look at the mass of the products.
Water has a chemical formula of H2O.
In here, there are two hydrogen atoms and one oxygen atom, and so its mass will be 2+16=18 amu.
There are two water molecules formed, and that means the total mass of the products is 18⋅2=36 amu.
As you can see now, the mass of the products is equal to the total mass of the reactants together, and the chemical equation obeys the law of conservation of mass.
Note that this applies to every balanced chemical equation.
How many moles are there in 0.150g Cu3S
Answer:
0.150g x 1mol/Molar mass of Cu3S = moles
Explanation:
0.150g x 1 mol/222.70= 0.0006735519 moles
*pls like
What is the difference between endothermic and exothermic changes?
Which type of change (exothermic or endothermic) is water freezing? Why? What type of matter is made of really hot and super excited (fast-moving) charged particles?
Answer:
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings. The frezing of water is an exothermic process because heat is being removed from the system. In gases the particles move rapidly in all directions, frequently colliding with each other and the side of the container. With an increase in temperature, the particles gain kinetic energy and move faster. Hope this helped! :)
Laboratory equipment is cleaned and properly stored after use primarily so that -- chemical products can be measured and recorded as data chemical products can be measured and recorded as data time is saved in setting up the next experiment time is saved in setting up the next experiment toxic materials can be kept in the laboratory toxic materials can be kept in the laboratory the possibility of contamination in the laboratory is minimized
Answer:
the possibility of contamination in the laboratory is minimized
Explanation:
When a particular laboratory equipment is used for a given purpose, it can not be used four another purpose until it has been thoroughly washed. This is done in order to avoid contamination when the equipment is subsequently used for a different purpose.
Hence, if a laboratory equipment is not properly cleaned and stored after use, they remain contaminated and give inaccurate results when subsequently used.
Which of the state of ionic Compounds are electrolytes
Answer: All ionic compounds are electrolytes. When ionic compounds dissolve, they break apart into ions which are then able to conduct a current ( conductivity ).
Explanation:
Calculate the percentage by mass of lithium in lithium hydroxide.
Answer:
20.1
Explanation:
li/LiOH×100/1
6/6+16+1×100/1
6/23=20.1%
Need help with my work chemistry assignment grade 12 college work please
Answer:
A)0.450 mol N2
B)294 g NH4 NO3
Explanation:Step by step! make sure when you see underneath the multipication eqaution that we are deviding!The arrows is what we are dividing
A)36.0gN H4N O3×1 molN H4NO3×2mol N2
↑ 1 ↑ 80.05gNH4NO3 ↑2mol N H4N O3
B)7.35molH2O×2mol N H4 N O3×80.05gN H4 N O3
↑ 1 ↑ 4molH2O ↑ 1mol N H4N O3
5) 2 and for the how many moles it is 10.9
Hope this helps!
Which best describes what is happening in the diagram?
At point 1, the air in the convection current is warmer and denser than at point 3 because its molecules contain more kinetic energy.
At point 2, the air absorbs thermal energy from the surrounding air, which causes it to become heavier and sink.
At point 3, the air in the convection current is cooler and lighter than the air in other parts of the current, so it is preparing to rise.
At point 4, thermal energy from warm air over the land is transferred upward toward cooler areas of the atmosphere.
Answer: its D. At point 4, thermal energy from warm air over the land is transferred upward toward cooler areas of the atmosphere
Explanation:
Define Conductor and Insulator...??
Answer -
Conductor - material which allow electricity to pass through them
Insulator - material which do not allow electricity to pass through them
Hope it helpz~
What mass of HCL is consumed by the reaction of 5. 0 of magnesium?
Assuming no other changes in temperature or volume, what will be the effect on the pressure inside a container of gas if the identity of gas is changed from nitrogen to helium
The pressure will increase if the gas is changed from nitrogen to helium.
Kinetic theory of gasesThe question is incomplete but I will try to help the much I can. We must note that the kinetic energy of the molecules of a gas depends on the temperature and the molar mass of the gas.
Since the average velocity of a gas depends on molar mass also, the pressure will increase if the gas is changed from nitrogen to helium.
Learn more about gases: https://brainly.com/question/1369730
The solid, liquid, and gas states of water differ from each other in
Ο Α.
the mass of the individual molecules.
O B.
the size of the individual molecules.
Ос.
the average speed of the molecules.
O D.
the electrical charge of the molecules.
Answer:
B
Explanation:
the size of the individual molecules.
what section do the nonmetals fill in the quantum mechanical model of the atom?
Answer:
Section P
Explanation:
PLS HELP ASAPP!!!! Describe how are the two forms of energy carried by waves and matter related????
Answer:
Energy is carried from one point to another or from one region to another by moving mass or through the action of waves.
· All waves have a source. This source transforms energy into forms that can be carried as waves.
· Waves are not material objects. Waves represent the moving energy being carried away from the source.
Waves are coordinated vibrations that transport energy. Sometimes waves require the vibration of particles in matter to move, other waves travel without any need for particle vibrations.
Explanation:
Wave energy requires no motion for its movement whereas matter energy requires motion. Wave energy travels in electromagnetic spectrum whereas this is not applicable to matter energy.
What is wave energy?Wave energy is obtained from the water currents in the ocean and seas. The energy so harnessed is a renewable form of energy.
Wave energy is important as it provides enormous energy harvest. Waves have the high potential to generate energy on a mass scale. This energy can be utilized for energy production, water desalination etc. Special wave energy converters are available for this purpose.
Wave energy will reduce the dependence on fossils for energy. It can be considered as a reliable source to obtain energy using wave power. However, it is an expensive way and also requires high maintenance.
Wave energy is also weather dependent. As disturbances in the weather affect the energy production.
Thus, waves can be considered as an important source of renewable energy on earth.
Learn more about wave, here:
https://brainly.com/question/19477984
#SPJ2
PLEASEE HELPPP MEEEEE
Calculate the mass of 3.7 L of CH4 at STP.
Answer:
Explanation:
Molar mass CH4 = 16g/molAt STP , 16g CH4 has volume = 22.4LMass of 3.136 L CH4 = 3.136L/22.4L * 16g = 2.24g
According to the standard temperature and pressure conditions and ideal gas equation, the mass of 3.7 L of CH₄ is 0.026 g.
What are standard temperature and pressure conditions?Standard temperature and pressure are defined as a standard set of conditions required for experimental measurements which are established to allow comparison between different sets of data.
Standards which are commonly used are those International Union of pure and applied chemistry and national institute of standards and technology.These are not universally accepted standards but are the ones which are commonly used.
Standard conditions of pressure and temperature are necessary to define standard reference conditions used to express volumes of liquids and gases.These values are important to physicists, chemists ,engineers ,pilots and navigators.
According to ideal gas equation mass= PV×molar mass/RT on substitution mass= 1×3.7×16/8.314×273=0.026 g.
Learn more about standard temperature and pressure,here:
https://brainly.com/question/29129606
#SPJ7
How many calories of energy will 20 grams of carbohydrates provide if 1 gram provides 4 calories?
PLEASE COMMENT YOUR ANSWER .
Answer:
i already commented it but i want points anyways its 80 because 20x4 = 80. it said one gram equals 4 calories and there is 20 grams so basically 4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4+4
20 grams at 4 calories per gram.
20*4=80 Calories.
in the end, A is your answer
A chemist uses 0.25 l of 2.00 m h2so4 to completely neutralize a 2.00 l of solution of naoh. the balanced chemical equation of the reaction is given below. 2naoh h2so4 right arrow. na2so4 2h2o what is the concentration of naoh that is used? 0.063 m 0.25 m 0.50 m 1.0 m
The concentration of the NaOH in the solution will be 0.5 mol/L
What will be the concentration?The concentration is defined as the amount of a particular chemical present in the mixture.
Now the given chemical reaction is:
2NaOH + H₂SO₄ = Na₂SO₄ + 2H₂O
The volume of (H₂SO₄)=0.25 L
The concentration of (H₂SO₄)=2.00 mol/L
The volume of (NaOH)=2.00 L
Now the concentration will be calculated as:
[tex]c(NaOH)= \dfrac{2c(H_2SO_4)}{v(NaOH)}[/tex]
[tex]c(NaOH)=\dfrac{2\times2\times 0.25}{2} =0.5\ \frac{mole}{L}[/tex]
Hence, the concentration of a solution of NaOH is 0.5 mol/L
To know more about concentration follow
https://brainly.com/question/17206790
Answer:
C. 0.50 M
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
What is the total number of atoms in
1.0 mole of COz?
Answer:
c.1.5 moles of cu Will contain a total of 9.0 * 10 ^ 23 ATOMS.
To convert moles into atoms they molar amount and number of atom is múltiples by avagadro's number.
A low-frequency radio wave has a frequency of 250,000 Hz. What is the wavelength of this radio wave?
Answer:
The wavelength of wave is 1.2×10³ m.
Explanation:
Given data:
Frequency of wave = 250,000 Hz
wavelength of wave = ?
Solution:
Formula:
Speed of light = wavelength × frequency
c = λ × f
λ = c/f
speed of light = 3×10⁸ m/s
Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.
λ = 3×10⁸ m/s / 250,000 Hz
Hz = s⁻¹
λ = 1.2×10³ m
The wavelength of wave is 1.2×10³ m.