Answer:
Explanation:
When we go down in a column , we are going down in a period . In going down , one additional orbit go on adding to the atom . But the total number of electrons in the outermost orbit which is also called valence electron remains the same .
For example , when we go down in the first group A , the outermost orbit go on changing like 1 s¹ , 2 s¹ , 3 s¹ . 4 s ¹ etc which represents hydrogen , lithium . sodium , potassium etc.
So we see that , it is number of valance electrons that remains constant.
1.) What are the chemical properties of matter?
Answer:
Chemical properties are properties that can be measured or observed only when matter undergoes a change to become an entirely different kind of matter. They include reactivity, flammability, and the ability to rust. Reactivity is the ability of matter to react chemically with other substances.
Explanation:
Your cute btw :)
A different student is given a 10.0g sample labeled CaBr2 that may contain an inert (nonreacting) impurity. Identify a quantity from the results of laboratory analysis that the student could use to determine whether the sample was pure.
Answer:
Mass of Ca in sample, Mass of Br in sample, Number of moles of Ca in sample, Number of moles of Br in sample, Mass or moles of element other than Ca or Br in sample
Explanation:
The AP Classroom will not count your answer to this question as correct unless it includes at least one of the answers listed above. If you say that theanswer to this question is density, it will be marked as incorrect, I found that out the hard way when I used the answers that brainly gave me.
Good luck,
I applaud you for using the sources avalible to you, which is /definetly not/ cheeting.
ANALYSIS
1. Why are resources like air and water considered to be at risk, even though
they are considered renewable?
Answer:
The pollution can cause resources to lessen.
Due to pollution, resources like air and water considered to be at risk, even though they are considered renewable.
What is pollution?Pollution is the presence on an environment or substance, harmful substances that are dangerous to the living organisms found in that environment.
Water and air pollution is a serious risk to human, animal and plant life in the environment.
Therefore, due to pollution, resources like air and water considered to be at risk, even though they are considered renewable.
Learn more about pollution at: https://brainly.com/question/24704410
#SPJ2
How many years are in 72,000 sec?
Answer:
72000 seconds equals 20 hours.
Explanation:
60 N net force is applied to a 12 KG box. What is the acceleration of the box?
Answer:
The answer is
5 m/s²Explanation:
The acceleration of an object given it's mass and it's net force can be found by using the formula
[tex]acceleration = \frac{force}{mass} \\ [/tex]
From the question
force = 60 N
mass = 12 kg
So we have
[tex]acceleration = \frac{60}{12} \\ [/tex]
We have the final answer as
5 m/s²Hope this helps you
how many significant figures in 12.030?
Answer:
5
Explanation:
because the 0 is Sig because there is a point and other numbers
Which metal would have more luster, zinc (30) or scandium (21)?
Answer:
i say zinc would
Explanation:
HELP ME PLZ
B
A
o
What is represented by letter B?
Answer:
Barium oxide, BaO, baria, is a white hygroscopic non-flammable compound
Explanation:
so the answer is BARIUM
Why are models and a common set of units important for scientists?
Answer:
Explanation:
When researching a question in science, we collect data, interpret it, and share the results with other scientists. A common measurement system allows us to make direct comparisons instead of having to know things like how much a certain animal weighs.
A neutral hydrogen atom is a special case as it can accept, remove, OR share
electrons during reactions with other atoms. If the electron is removed from
hydrogen, the remaining positive proton number in the atom is 1 and remaining
negative electron number is?
Answer:
The remaining negative electron number is 0.
Explanation:
1 - 1 = 0 since hydrogen has exactly 1 electron. The charge must be balanced if it is a neutral atom. The 1 electron got peeled off and the remaining number is 0. That means the hydrogen atom is a proton now.
Keeping in mind the rules for significant digits, what is the product of 0.8954 m and 2.98 m?
Answer: 3.240576
Explanation:
There are various ways of doing multiplication this is one of them
The wording "keep in mind the rules for significant digits" implies that we are to use these to show where the decimal place goes by approximating the answer. Then conducting the exact calculation.
Consider 0.8 as 8
×
1
10
3
×
8
×
1
10
=
2.4
So the solution is some where a bit above 2.4
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Lets just use the numbers
Multiply both 0.8439 and 3.84 by 1000 to get rid of the decimal place. This makes thing more straight forward. So we end up with:
8439
×
38400
Split up the 38400 into 30000+ 8000 + 400
30000
×
8439
=
253170000
.
8000
×
8439
=
.
67512000
.
.
400
×
8439
=
.
.
3375600
−−−−−−−−−
←
Add
.
324057600
By our approximation we are expecting the form of
2.4
+
small amount
So the answer is
3.240576
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Check by calculator:
0.8439
×
3.84
=
3.240576
______ is a way to slow down the reactions that spoil milk
Answer:
b. keeping milk cold
Explanation:
The cool temperature in the fridge will stop it from going to any further reactions so it won't get spoilt
d. Keeping milk warm can help in slowing down of the reaction that can spoil milk.
Pasteurization can be defined as the heat treatment process in which the heat is provided to a liquid for example milk to prevent the growth of microbes which are least resistant to the heat. This process destroy the microbes, their spores, and also prevent their colonization.This process is useful in preventing soreness of milk and extends its shelf life. Keeping milk in cold container, in a cold temperature, or away from other sources of food will not help in slowing down the reactions that spoil milk.Hence, d. Keeping milk warm can help in slowing down of the reaction that can spoil milk.
Learn more about milk:
https://brainly.com/question/22512463
An atom has a mass number of 19 and an atomic number of 9. What element is it? What is it’s symbol? How many protons, neutrons and electrons does it have? PLEASE HELP NEED ANSWER ASAP
Answer:
9 protons 9 electrons and 10 neutron
Explanation:
The atomic number is the number of protons .In a neutral atom,the number of electrons equals the number of protons.Mass number is the sum of the protons and nuetrons of a particular isotope.If you have mass number and atomic number,subtract the atomic number from the mass number to get the number of nuetrons. Mass number- atomic number= number of nuetrons
Which of the samples pictured is most likely a nonmetal?
Answer:
c
Explanation:
Answer:
it is c because its a hard one and you should know what that is and it is a nonmetal even if not exactly its to be slightly
Explanation:
i need to know what the summary of matter is helpppppp!!!!
Answer:
Matter can be classified according to physical and chemical properties. Matter is anything that occupies space and has mass. The three states of matter are solid, liquid, and gas. A physical change involves the conversion of a substance from one state of matter to another, without changing its chemical composition.
Explanation:
Does Kumiho the legendary exist??
Answer: Deriving from ancient Chinese myths and folklores, a fox that lives a thousand years turns into a kumiho, like its Japanese and Chinese counterparts. It can freely transform, among other things, into a beautiful woman often set out to seduce boys, and eat their liver or heart (depending on the legend).
Hoped that helped!
Answer:
No
Explanation:
The Kumiho is similar to other fox creatures, such as the Japanese kitsune and Chinese Huli jing. Even though they have similar magical abilities and longevity, Kumiho is more malevolent than other fox spirits. Of these long-lived legendary creatures, the Kumiho is the only fox that kills and eats humans. Kumiho is just a myth itś not real and no one has seen this fox so "it" does not exist.
What are the key differences between dependent and independent variables? *
Which of the following units is NOT an official Sl unit?
A)meter
B)inches
C)second
D)kilogram
solve find the value of x
Answer:
50
Explanation:
2x+5=105
2x=100
2x/2=100/2
x=50
12. Which of the following species has the
least mass?
A. Electron C. Hydrogen ion
B. Helium atom D. Neutron
13. The mass number of an element whose
atom contains 13 electrons, 13 protons and
14 neutrons is
A. 13 B. 26 C. 27 D. 40
14. Which of the following elements exhibits
variable oxidation states and forms
12.electrons
13.13
14.aluminum has 14 neutron.
If you were in Canada and purchased a 1 kg apple at the grocery,how many grams were in the apple?
Answer:
1000 gram
Explanation:
because mass is constant everywhere
is this enough money for this question
A certain type of frog reproduces sexually and has 36 pairs of chromosomes in each of its body cells. How many chromosomes are in each of the frog’s sex cells?
Answer:
The answer is 36 on edgenuity.
Write the noble gas configuration for nickel
Answer:
[Ar] 3d⁸ 4s²
Explanation:
Atomic number: 28
Symbol: Ni
Atomic mass: 58.6934 u
What do a hypothesis and scientific law?
Answer:
If you mean "What is a hypothesis and the scientific law?" than hypothesis means a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation and scientific laws or laws of science, are statements, based on repeated experiments or observations, that describe or predict a range of natural phenomena. The term law has diverse usage in many cases across all fields of natural science.
Answer:
If you mean "What do hypothesis and scientific law have in common" than a hypothesis is a limited explanation of a phenomenon; a scientific theory is an in-depth explanation of the observed phenomenon. A law is a statement about an observed phenomenon or a unifying concept.
HELP ME WITH THIS QUESTION PLEASE
ASAP
When a cup is placed on a table, which force prevents the cup from falling to the ground?
A gravitational force
B.
normal force
с.
resistance force
D.
tension force
Answer:
B. normal force
Explanation:
When a cup is placed on a table, the forces acting on the cup are the gravitational force and the normal force. The gravitational force acts in the downward direction while the normal force acts in an upward direction. It is clear that the gravitational force is balanced by the normal force. So, the correct option is (b) " normal force ".
Which of the following statement(s) are true about the atoms of any element?
a) The number of protons in an atom of an element is unique to each element.
b) The number of protons and neutrons in an atom of an element is unique to each element
c) A proton in an atom of one element is identical to a proton in an atom of another element.
d) The number of protons in an atom of an element is the same for all elements.
Answer:
C
ok please mark me brainlist
Which of the following did federalists oppose?
Answer:
The Federalists felt that this addition wasn't necessary, because they believed that the Constitution as it stood only limited the government not the people
Laboratory equipment is cleaned and properly stored after use primarily so that
Options are provided in the given question, so the complete question is as follows:
Laboratory equipment is cleaned and properly stored after use primarily so that —
A. chemical products can be measured and recorded as data
B. time is saved in setting up the next experiment
C. toxic materials can be kept in the laboratory
D. the possibility of contamination in the laboratory is minimized
Answer:
D. the possibility of contamination in the laboratory is minimized
Explanation:
After the completion of experiments, all the laboratory equipment should be cleaned and properly stored to minimize the possibility of contamination in the laboratory.
Any contamination in the laboratory can affect the experiment and will not give an accurate result, so it is important to clean and store the equipment properly.
Hence, the correct answer is "D".
110) Lake Michigan holds 1.3 x 10's gallons of water. If just Chicago removed water from the lake and it
never rained again, how many days would the water last? Chicago uses 1.2 x 109 gallons of water /day
gallons/day
You omitted what it was raised to the power in 1.3 x 10's gallons of water, so i will put it up as 1.3 x 10^15 gallons of water and solve with it
Answer:1,083,333 days
Explanation:
Total amount of water held by lake Michigan= 1.3 x 10^15 gallons of water
Amount of water Chicago uses per day =Chicago uses 1.2 x 10^9 gallons of water /day
Therefore,
Number of days water would last if it doesnt rain = Total gallons provided by lake Michigan/ Total gallons consumed per day
=1.3 x 10^15 gallons of water/ 1.2 x 10^9 gallons of water /day
= 1,083,333 days
WILL MARK BRAINLIEST
8. When the numbers 552. and 38.14 are added the result is:
a) 591
b) 590
c) 5.90 x 10^2
d) 589
Answer:
b) 590
Explanation: