Answers
Answer:
38
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
In given question atomic number is 38 which means number of proton and number of electrons are also 38 because number of protons are electrons are always equal in neutral atom.
Related Questions
Temperature is a measure of the average _____energy of particles in a substance.
Answers
Answer:
kinetic energy
Explanation:
Answer:
kinetic energy
Explanation:
In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes.
Help me answer the question please I don’t get it this is earth science not chemistry.
Answers
See a similar question to this one answered here:
https://brainly.in/question/4914083
Someone drops a book on the floor, and it makes a loud noise. At that time, you turn to look at the person who dropped the book. The loud noise is an example of a…
A. Hydrotropism
B. Stimulus
C. Response
D. Phototropism
Answers
Answer: Stimulus
Explanation: The definition of Stimulus is "a thing or event that evokes a specific functional reaction in an organ or tissue," according to the Oxford Dictionary. So the book dropping and causing a noise is an example of a stimulus.
In the apple activity you completed which of the following is an example of a constant
Answers
Answer: the type of apple because it is an example of a constant
Explanation:
need help asap
Calculate the frequency for a wavelength of 635 nm.
Answers
Answer:
472114107.086614 MHz
Explanation:
f = C/λ
λ: Wavelength in meters
C: Speed of Light (299,792,458 m/s)
A + ion (positive ion, one with extra positive charge)?
Answers
Answer:
If an ion has a positive charge then it has lost an electrons.
Explanation:
So you don't "gain" anything when the ion has a positive charge. It loses an electron which means it has more protons than electrons. Thus, the ion has a positive charge. If it "gained" an electron then it would have a negative charge.
Why are prefixes used in naming covalent compounds?
Answers
Answer:
1 - mono
2 - di
3 - tri
4 - tetra
5 - penta
6 - hexa
7 - hepta
8 - octa
9 - nona
10 - deca
Explanation:
These are prefixes that can go on an element.
For example:
CO2= Carbon Dioxide
Answer:
The same atoms can combine in more than one ratio.
Explanation:
If you weighed 25 grams of NaOH in this lab, how many moles of NaOH
would you have?
Answers
Featured snippet from the web
The answer is 0.025001806380511. We assume you are converting between moles NaOH and gram. You can view more details on each measurement unit: molecular weight of NaOH or grams This compound is also known as Sodium Hydroxide. The SI base unit for amount of substance is the mole .
(25 grams * 1 mol) / (40 grams) = .625 mols
12. A malleable sheet of metal used to wrap food in the kitchen is made of only aluminum. What can be said about the metal sheet?
Answers
Answer:
is aluminium prepared in thin metal leaves with a thickness less than 0.2 mm (7.9 mils); thinner gauges down to 6 micrometres (0.24 mils) are also commonly used.[1] In the United States, foils are commonly measured in thousandths of an inch or mils. Standard household foil is typically 0.016 mm (0.63 mils) thick, and heavy duty household foil is typically 0.024 mm (0.94 mils). The foil is pliable, and can be readily bent or wrapped around objects. Thin foils are fragile and are sometimes laminated with other materials such as plastics or paper to make them stronger and more useful. Aluminium foil supplanted tin foil in the mid 20th century.
Identify the law that explains the following observation:
Nitrogen Dioxide can be formed by reacting 14 grams of
nitrogen with 32 grams of oxygen.
Answers
Answer:
Proust's law of definite proportion
Explanation:
The law of constant proportion states that the components elements of a given chemical compound combine with each other in a fixed mass ratio when the compound is produced by any given process
Therefore, from the question, the chemical formula for Nitrogen Dioxide is NO₂, where the molar mass of nitrogen, N = 14
The molar mass of oxygen, O = 16
Given that one molecule of NO₂, contains one atom of nitrogen and two atoms of oxygen, one mole of NO₂ will contain 14 grams of nitrogen and 32 grams of oxygen, according to Proust's law of definite proportion.
help plz really need your help if u know answer if u don't DO NOT ANSWER this is not the first time I have posted this question
Answers
T eg(1) : 97.5°C, T eg(2): 98.5°C, T eg(3): 99.2°C
∆T water(1): -2.5°C, ∆T water(2): -1.5°C, ∆T water(3): -0.8°C
∆T metal(1): 77.5°C, ∆T metal(2): 80.5°C, ∆T metal(3): 80.2°C.
ft= (m1 cp1 t1 + m2 cp2 t2 + .... + mn cpn tn) / (m1 cp1 + m2 cp2 + .... + mn cpn) (1)
where,
1000g = 1kg
ft(t eg)= final mixed temperature (°C)
m = mass of substance (kg)
cp = specific heat of substance (J/kg°C)
t = temperature of substance (°C)
HURRY !The number of electrons in an atom decreases as you move from left to right in the periodic table.
Please select the best answer from the choices provided
T or F
Answers
I believe this is false, due to the fact that atomic radius decreases while you move right to left...but please, correct me if I'm wrong ^^'''
Answer:
False
Explanation:
Record the length of the object shown.
Answers
Answer: 7.26 mm
I did the test already.
Magnetic substance is used to seperate
none magnetic substances.
False
True
Answers
Answer:
the answer should be true
hope this helps :)
Explanation:
In a solution, the particles of different substances are ___ a. mixed evenly, b. never mixed, c. mixed unevenly, d. separated from each other. PLEASE ANSWER ASAP TY
Answers
When creating a solution, the different particles break down and combine with each other, hence why it’s called a solution, it’s creating a new solution. You can evenly mix a mixture, but it wouldn’t create a substance. So it should be D, as that is the only one that would apply to substances.
What is the density of an object that has a mass of 62.4 grams and a volume of 7.6 cm 3 ?
Answers
d≈8.21 g/cm^3
Explanation:
The density can be found by dividing the mass by the volume.
d=m/v
The mass is 62.4 grams and the volume is 7.6 cubic centimeters.
m=62.4 g
v=7.6 cm^3
Substitute the values into the formula.
d=62.4 g/7.6 cm^3
Divide
d= 8.210526315789474 g/cm^3
Round to the nearest hundredth. The 0 in the thousandth place tells us to leave the 1 in the hundredth place.
d≈ 8.21 g/cm^3
The density of the object is about 8.21 grams per cubic centimeter.
1.why does gravity exist?
2.what does the strength of gravity on?
3.what will have stronger force of gravity, jupiter or earth ?
This class is science !!
Answers
Answer:
Gravity exists because elementary particles (electrons, quarks, and neutrinos), are NOT static with time and expansion. Matter is dynamic; elementary particles must continually accrete energy (the quanta of space) in order to conserve the continually increasing angular momentum of the expanding universe.
Strength of gravity
9.80665 m/s 2
Jupiter
Samantha was not feeling well. She had a fever and felt nauseous. Her mother took Samantha to the doctor who prescribed an antibiotic. What kind of infectious agent did Samantha have?
A.bacterial
B.fungal
C.parasitic
D.viral
Answers
Answer:
A
Explanation:
Why are metals malleable?
a
They are shiny.
b
The electrons are delocalized and able to move between the atoms.
c
The electrons are held tightly within the lattice structure making it strong.
d
The electrons are shared between two metal ions and this holds the atoms together.
Answers
Answer:
b is the anwer
Explanation:
the option is the explanation
what is the cell cycle? plz help, ASAP
Answers
Answer:
It is the process of events that happen in a cell before the cell division occurs. Please see the attached image for a better clarification of the cell cycle.
Explanation:
Which is a characteristic of the part of the atom marked
"A"?
It contains most of the mass.
It is negatively charged
It is mostly empty space.
It is composed of electrons.
Answers
Answer:
It contains most of the mass
Explanation:
that part A rigth
Answer:
A
Explanation:
which order system shows the levels of organization from largest to smallest
organism, organ system cell organ tissue
organism tissue organ system organ cell
organism organ organ system cell tissue
organism organ system organ tissue cell
Answers
Answer:
cell → tissue → organ → organ system → organism
Explanation:
Answer:
The correct answer is cell → tissue → organ → organ system → organism.
Explanation:
I know this because I am smart
the product of 173.06 times 0.21 should be reported as what using proper number of sig figs?
Answers
Answer:
36.3
Explanation:
The full answer would be 36.3426, but because of the 0.21, you round it down to 3 sig figs.
The chemical combination of two or more different atoms in fixed amounts is called a(n)
A. element
B. mixture.
C. orbit
D. compound.
Answers
Answer:
D. compound
Explanation:
Answer:
compound
Explanation:
study island
Which of the following has a higher electronegativity oxygen or selenium?
Answers
A 55kg skier accelerated at 3 m/s^2. How much force must the skier exert?
Answers
Answer:
The answer is 165 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × accelerationFrom the question
mass = 55 kg
acceleration = 3 m/s²
We have
force = 55 × 3
We have the final answer as
165 NHope this helps you
What is the relationship between variable x and variable y?
As variable x increases, variable y increases.
As variable x increases, variable y decreases.
Both variables show a trend toward decreasing values.
No distinct relationship exists between variables x and y.
Answers
Answer:
So x is usually called the independent or explanatory variable, and y the dependent or response variable. Another way to think about it, sometimes, is that x is used to predict y. So x is something that comes before y in time. That is why, for example, height at age 2 is on the x axis and height at age 18 on the y
Explanation:
hope this helpss
x is independant and y in dependant .
With radiocarbon dating, scientists compare an object's carbon-14 levels with _____. the carbon-14 levels of an object from the same time period carbon-14 levels in the atmosphere the carbon-14 levels in the rock surrounding the object the object's carbon-12 levels
Answers
Answer:carbon-14 levels in the atmosphere
Explanation:
When carrying out radiocarbon dating, the level of carbon-14 in a sample is compared with the level of carbon 14 in the atmosphere because, objects exchange carbon-14 with the atmosphere.
Comparison of the activities of carbon-14 in the atmosphere and in the sample gives the age of the sample since the half-life of carbon-14 is a constant.
please answer the “(fill-in)” ones thank you :)
Answers
Answer:
look
Explanation:
diffculte ou my good i need help too
What is a graph?
A graph is a _______________________ representation of the relationship between two quantities.
_______________________ variable (manipulated)
Controlled by experimenter
_______________________________ variable (responding)
Something we observe as the result of the experiment
Answers
*Visual
*Independent
*Dependent