Answer:
A. repetition of their physical and chemical properties when arranged according to increased atomic number
Explanation:
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, option A is correct option.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
Periodic law states that elements show a repetition of their physical and chemical properties when arranged according to increased atomic number.
Therefore, the correct option is option A out of given options.
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Calculate the number of molecules in 64.5 grams of Nitrogen monoxide, NO
N=9.933
Explanation:
no of mole = m÷mr
then ,no of molecules=n×la
Explain why the metals conduct electricity
write in your own words please, don't copy-paste from internet
Answer:
Metals conduct electricity because the electrons inside the metal are relatively free to move. So when electricity is pass through metals, electrons carry electricity and spread it all over the metal. The mobility of electrons is the reason why metals conduct electricity.
How many atoms of Mg are present in 97.22 grams of Mg?
Answer:
2.439 x 10E24 atoms
Explanation:
from
N=n x NA where
N- number of atoms
n-number of moles and NA is the avogadro's number
What is the difference between an empirical formula and a molecular formula?
Answer:
The empirical formula simply states the ratios of the elements that make up the molecule, while molecular formulas specify the amounts of each element exactly, not just giving the ratio. Let's take ethane (C2H6) as an example.
Anyone know how to do this?
Answer:I can’t see the question
Explanation:
Look at the image below:
Palet Reyes
Preiste
Las Trances
San Juan Bautista
Panades
NORTH AMERICAN PLATE
und
SACRO PLATE
Carne Plan
ANDREAS PAUL
What type of plate boundary is shown here?
convergent
divergent
O transform
Answer:
Thats also transform boundary
Do you think personality
traits are primarily inherited
from your parents or
influenced by the
environment? What is your
evidence you researched?
Personality traits are influenced by a combination of genetic and environmental factors. Research suggests that both genetics and the environment play significant roles in shaping an individual's personality.
Studies on twins and adoption give proof that genetics affect personality. When opposed to fraternal twins, who only share 50% of their genetic makeup, identical twins, who share 100% of their genetic material, frequently show stronger similarities in personality traits. This shows that certain personality traits are influenced by hereditary factors.
Yet, environmental influences also have a considerable impact on personality. Despite having comparable DNA, studies on non-twin siblings reared in the same home have found that they frequently display personality differences.
This shows that the environment, including parental practices, cultural influences, and life events, has a significant impact on personality development.
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which element has a smaller atomic radius than strontium (Sr)?
it is tecnically magnesium,
Answer:
barium is the answer
Im gonna ride it do it just how you like it and after that let's do it?
what is the answer of this.
Answer:
the hell?
Explanation:
Which of the following may be a reason why climbing up objects would help the ivy survive?
Why is systems thinking important?
Systems thinking ignores the details of a system and just looks at its overall function.
Systems thinking ranks the parts of a system in terms of most important to least.
Systems thinking allows us to understand all the parts that make up the whole system.
Systems thinking examines how a system affects human life.
Answer:
Systems thinking allows us to understand all the parts that make up the whole system.
Explanation:
Just took the test
The systems thinking important because, Systems thinking allows us to understand all the parts that make up the whole system. Therefore, option C is correct.
What system thinking ?By considering the world's complexity in terms of links and entire rather than breaking it down into its component components, systems thinking helps us make sense of how complicated the world is. It has been applied as a method for investigating and producing efficient action in challenging situations.
By using a deeper grasp of the surrounding structure and its constituent parts rather than relying just on previous events, systems thinking gives a technique to more accurately forecast future outcomes.
Systems thinking is a discipline in management that focuses on understanding a system by looking at the connections and interactions between the different parts that make up the entire of that defined system. The concept of the "entire system" is a way of looking at an entire organization in relation to its surroundings.
Thus, option C is correct.
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Explain why a halogen bulb has a longer bulb life than a traditional incandescent bulb filled with argon.
Answer:
The halogen bulb lasts longer because the filament lasts longer. It can have twice the life of an incandescent and use the same amount or slightly less (10%) electricity.
Explanation:
Bill is experimenting with two simple machines. How will he know which
machine is more efficient?
O It will use less force to do the same amount of work.
O It will use more force to do the same amount of work.
O It will be lighter and stronger than the other simple machine.
It will not be possible to tell which simple machine is more efficient.
Is it okay if you help me? I'm kind of in a tight spot here. Tysmmmmmmmmmmmmm o(❁´◡`❁)o!!
Answer:
the answer is true
Explanation:
it's just true
meantion the two groups of mineralsalts and their two examples (each)
Answer:
sodium example salt and soy sauce
potassium example meat milk fresh fruits
should we learn chemical kinetic derivation
Answer:
Yes
Explanation:
It is important to learn about in science
Answer : Yes
Explanation:
One reason for the importance of kinetics is that it provides evidence for the mechanisms of chemical processes. Besides being of intrinsic scientific interest, knowledge of reaction mechanisms is of practical use in deciding what is the most effective way of causing a reaction to occur.
how did the periodic table get its name?
a. the periodic table got its name from the way the elements are arranged in periods called groups.
b. the periodic table got its name from the way the elements are arranged in rows which are called periods.
c. the periodic table got its name from the way the elements are arranged in rows which are called periodic groups.
d. the periodic table got its name from the way the elements are arranged in rows which are called groups.
Answer:
no te engiendo mi panahellow
Answer:
b
Explanation:
b. the periodic table got its name from the way the elements are arranged in rows which are called periods.
If an element is very reactive, is it more likely to be found in elemental state or in a compound?
Answer:
Compound state
Explanation:
Because reactive elements mostly react immediately with other elements
PLS HELP ME THIS IS DUE TODAY BRO ILL BRAINLIST U JUST DO THE ONES U KNOW WAJDHWNDIGB!
Answer: Helium: atomic number 2. EC 2
Neon: atomic number 10. EC 2,8
hydrogen: atomic number 1. EC 1
magnesium: atomic number 12. EC 2,8,2
chlorine: atomic number 17. EC 2,8,7
Aluminum: atomic number 13. EC 2,8,3
Explanation: hope this helped
what is light energy
Answer:
Light energy is a form of electromagnetic radiation. Light consists of photons, which are produced when an object's atoms heat up.
Explanation:
Answer:
Light energy is a kind of kinetic energy with the ability to make types of light visible to human eyes. Light is defined as a form of electromagnetic radiation emitted by hot objects like lasers, bulbs, and the sun. Light contains photons which are minute packets of energy.
Explanation:
hope it's helpful for you.
very urgent
1. Describe an experiment to show the chemical effect of electric current.
2. State three conditions necessary for combustion
3. Describe all that you observe when a piece of iron is placed in copper sulphate solution for a
few minutes.
Explanation:
STEP 1- Take two iron nails.
STEP 2- Clean it with sand paper.
STEP 3- Wrap copper wire around both the nails. And connect the other end to the battery terminal.
STEP 4- Take water in beaker and little amount of salt in it or a few drpos of sulphuric acid in it.
STEP 5- Immerse the nails in the solution.
STEP 6- Observe the nails carefully. You can see bubbles of gases coming out from water near nails.
When, electeric current is passed through water gases like hydrogen and oxygen are evolved.
2.Three things are required in proper combination before ignition and combustion can take place---Heat, Oxygen and Fuel. There must be Fuel to burn. There must be Air to supply oxygen. There must be Heat (ignition temperature) to start and continue the combustion process.
When iron is placed in Copper sulphate solution, the iron is coated with a brown coloured substance "copper" and CuSo4 solution changes from blue to light green. This is due to iron displaces copper as it is more reactive than copper.
If I react 4.2mol N2 with H2, how many moles of NH3 would I produce?
Answer:
first balance the reaction
n2 + 3h2 --> 2NH3
then you have your ratios
so for every mole of N2 you get 2 NH3
so 8.4mol is your answer
Explanation:
Look at the image below:
Pain Reyne
Ben Francia
Les Trans
01 Juan Bautista
Pents
SAN
PEAS FAULT
NORTH AMERICAN PLATE
CIRC PLATE
Carina
What type of plate boundary is shown here?
O convergent
divergent
transform
Answer:
Transform
see image below:
Which layer of the ocean is the least dense?
Question 4 options:
they are all the same
middle layer
closest to the ocean floor
closest to the surface
Answer:
the deep ocean
Explanation:
goog le
The layer which is closest to the surface is least dense.
What are the layers of ocean?The ocean can be divided into three main layers:
The surface layer (also known as the epipelagic zone), which extends from the surface to about 200 meters deep and is the warmest and lightest layer.
The mesopelagic zone (or twilight zone), which extends from 200 to 1000 meters deep and is characterized by limited light and declining temperatures.
The bathypelagic zone (or midnight zone), which extends from 1000 to 4000 meters deep and is the coldest, darkest, and most pressure-filled layer.
Below the bathypelagic zone lies the abyssopelagic zone, which extends from 4000 to the ocean floor and is characterized by near-constant darkness and extremely cold temperatures.
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If 3.68 grams of zinc were allowed to react with excess hydrochloric acid to produce zinc chloride and hydrogen gas, how much zinc chloride should be produced?
Suppose that 7.12 grams of zinc chloride is actually recovered, what is the per cent yield?
Answer:
Here... Since there is excess HCl, you know the Zinc will be the limiting reagent. I was able to create the reaction equation based on the info you gave: Z + 2HCl ----> ZCl2 +2H. Now, in order to find the theoretical yield of ZCl, you need to convert Zinc from grams to moles. Do this by dividing by its molar mass (65.38), thus: 3.68 (g) / 65.38 (g/mol) = 0.056286... moles.
Now, using the balanced equation we made earlier, we see that 1 mole of Zinc creates 1 mole of ZCl2. Thus our ratio is 1:1. This makes the next step easy. Since it is 1:1, we multiply the number of moles we have of Zinc (0.056286...) by the number of moles it will create of ZCl (1). (0.056286)(1) = 0.056286 moles ZCl. Now convert this to grams by multiplying by its molar mass (136.28) and you get 7.67 grams. This is your theoretical yield. The percent yield is found by dividing the actual amount obtained (7.12 g.) by the theoretical yield (7.67 g.) then multiply that by 100%. When this is done, your Percent Yield is about 92.8%
How many liters are there in 28g of B?
What happens to potential energy as kinetic energy increases during a roller coaster ride?
Answer:
On a roller coaster, energy changes from potential to kinetic energy and back again many times over the course of a ride. Kinetic energy is energy that an object has as a result of its motion. Potential energy is the energy an object has as a result of its position
Explanation:
____Na3PO4+____CaCI2 --->____NaCI+ ____Ca(PO4)2
Answer:
3CaCi2 + 2Na3PO4 → Ca3(PO4)2 + 6NaCi
Explanation:
How many atoms of aluminum (Al) are in 6.98 mol of aluminum?
Answer:
[tex]\boxed {\boxed {\sf 4.20 *10^{24} \ atoms \ Al }}[/tex]
Explanation:
To convert from moles to atoms, we must us Avogadro's number: 6.022*10²³. This tells us the number of particles (atoms, molecules, etc.) in 1 mole of a substance. In this case, it is atoms of aluminum.
We can use the number as a fraction.
[tex]\frac{6.022*10^{23} atoms \ Al}{1 \ mol \ Al}[/tex]
Multiply by the given number of moles: 6.98
[tex]6.98 \ mol \ Al *\frac{6.022*10^{23} atoms \ Al}{1 \ mol \ Al}[/tex]
The moles of aluminum will cancel.
[tex]6.98 *\frac{6.022*10^{23} atoms \ Al}{1 }[/tex]
The denominator of 1 can be ignored.
[tex]6.98 * {6.022*10^{23} atoms \ Al}[/tex]
Multiply.
[tex]4.203356*10^{24} \ atoms \ Al[/tex]
The original measurement of moles has 3 significant figures, so our answer must have the same.
For the number we calculated, that is the hundredth place. The 3 in the thousandth place tells us to leave the 0.
[tex]4.20 *10^{24} \ atoms \ Al[/tex]
There are about 4.20*10²⁴ atoms of aluminum in 6.98 moles.
How many eggs are in 1 mole of eggs?
Answer:
I believe it is Avogadro's number: 6.022 × 10²³
Explanation:
One mole of a substance is equal to 6.022 × 10²³ units of that substance
