Which part of scientific design occurs when an experiment is conducted by more than one scientist to determine the validity of results?
A. replication
B. research
C. trials
D. variables
Answer: c
Explanation:
i think the answer is c
Are atoms the smallest particles we know about, or are there smaller ones?
Answer:
That we know about yes, but physicians still say there are more things out there. (we do not know about these yet tho)
Explanation:
To which family on the Periodic Table does this Bohr Model belong?
Answer:
As the valance shell have 7 valance electrons .
It belongs to halogen family (group 17).
Based on the article “Will the real atomic model please stand up?,” why did J.J. Thomson experiment with cathode ray tubes?
A. to specifically identify the nucleus as a separate part of an atom
B. to determine that electric beams in cathode ray tubes were actually made of particles
C. to prove John Dalton and Democritus wrong
D. to determine the exact energy output of cathode ray tubes
Answer:
B. to determine that electric beams in cathode ray tubes were actually made of particles
Explanation:
Answer:
B. to determine that electric beams in cathode ray tubes were actually made of particles
Explanation:
edg 2020
the density of granite is approximately 2.7 grams per cubic centimeter. what would be the approximate mass of a cube of granite 10.0 centimeters on a side
Given parameters:
Density = 2.7g/cm³
Length of the cube = 10cm
Unknown:
Mass of the cube = ?
Solution:
Density is the mass per unit volume of a substance.
Density = [tex]\frac{mass}{volume}[/tex]
Mass = density x volume
We need to find the volume of the cube;
Volume of the cube = L³
where L is the length of the cube;
Volume of the cube = 3³ = 27cm³
So, the mass of the granite = 2.7 x 27 = 72.9g
The granite has a mass of 72.9g
The nuclear equation is incomplete. Superscript 239 Subscript 94 Baseline P u + Superscript 1 Subscript 0 Baseline n yields Superscript 100 Subscript 40 Baseline Z r + blank + 2 Superscript 1 Subscript 0 Baseline n What particle completes the equation? Superscript 138 Subscript 54 Baseline X e Superscript 139 Subscript 54 Baseline X e Superscript 119 Subscript 54 Baseline X e Superscript 138 Subscript 52 Baseline T e
Answer:
The correct option is the first option
Explanation:
The equation described in the question is shown below
²³⁹₉₄Pu +¹₀n ⇒ ¹⁰⁰₄₀Zr + blank + 2¹₀n
This equation is a nuclear fission because it involves the splitting of a heavy nucleus, Plutonium (Pu), into smaller nuclei, Zirconium (Zr) and an unknown nuclei.
The law of conservation of matter states that matter can neither be created nor destroyed hence in other to get the missing atom, we must know the total number of subscripts (mass number) and superscripts (atomic number) on both sides.
The total mass number on the reactant side is 239 + 1 = 240
The total atomic number on the reactant side is 94 + 0 = 94
While, The total mass number on the product side is 100 + 2(1) = 102
The total atomic number on the product side is 40 + 2(0) = 40
To determine the missing atom, you subtract the the total atomic number of the product from that on the reactant side; 94 - 40 = 54
The atom with the atomic number 54 is Xenon,
To determine the mass number of the xenon isotope involved, you subtract the the total mass number of the product from that on the reactant side; 240 - 102 = 138.
Hence, the particle that completes the equation is ¹³⁸₅₄Xe, the first option
Answer: A on edge
Explanation:
the person above me explained it well but i wanted to shorten it.
Plz help! The best answer will be marked as brainliest!
Make a funny sentence of alloys for Magnesium
Here is an example for Mercury, it HAS to for Magnesium
“I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon”
Answer:
Sometimes the whole alloy in a uniform is a solid solution
How many atoms are present in 3 moles of chromium?
O 52.0 atoms
O 6.02 x 1023 atoms
O 1.80 x 1023 atoms
O 1.80 x 1024 atoms
Answer:
1.80 x 10^24 atoms
Explanation:
3moles × 6.022×10^23 atoms/mole
Who uses petroleum and for what purpose?
Answer:
today, petroleum is mostly used as a source of energy, being rich in combustible carbon in the production of electricity or running some sorts of heat engines. ... Raw petroleum (also known as crude oil) is used in three major ways: Transportation, Electricity Generation, and Material Production.
Explanation:
hope it helps!!!!!!!!!!!!!!!!!!!!!!!!!!
Fill in the [?]: 12,341 us = [?] S
The nucleus of an atom consists of:
a. lons & isotopes
b. Electrons & neutrons
c. Protons & neutrons
d. All of the above.
Answer:
the nucleus of an atom consistens of protons and neutrons
The atoms of a solid aluminum can are close together, vibrating in a rigid structure. if the can is warmed up on a hot plate,
Answer:the atoms of a solid aluminium can are close together vibrating in a rigid structure if the can is warmed up on a hot plate
Explanation:
The model of a neutral element is shown below. Which particle determines the reactivity of the element?
A
B
C
D
An atomic model shows 19 protons, 20 neutrons, and 19 electrons. What is the mass number of the atom?
A. 39
B. 20
C. 58
D. 19
Answer:
A. 39
Explanation:
Mass number= #protons + #neutrons
19+20= 39
Taking into account the definition of mass number, the correct option is the option A: the atomic mass of the atom is 39.
First of all, all atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them. Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged (electrons).
On the other hand, the mass number tells us the total number of particles in the nucleus. That is, the mass number is the sum of the number of protons and the number of neutrons in the atomic nucleus:
Mass number = (number of protons) + (number of neutrons)
It is represented by the letter A.
In this case:
number of protons= 19number of neutrons= 20So:
Mass number = 19 + 20
Solving:
Mass number= 39
In summary, the correct option is the option A: the atomic mass of the atom is 39.
Learn more:
https://brainly.com/question/11837355?referrer=searchResultshttps://brainly.com/question/1758023how many neutrons would 34 16 S-2 have? A. 16 B. 18 C. 20 D. 32
Answer:
Explanation:
For
32
S
2
−
, there are 16 protons, 18 electrons, and 16 neutrons.
Explanation:
The atomic number,
Z
, specifies the number of protons, positively charged, massive, fundamental particles present in the sulfur nucleus. This number defines the sulfur atom as a sulfur atom (i.e if there were 17 protons, the atom would be chlorine).
For a neutral atom, if there are 16 positive nuclear charges, there must necessarily be 16 negatively charged particles, 16 electrons, whizzing about the nucleus.
Because electrons have negligible mass, to account for the mass of the isotope, there must be 16 neutrons, 16 neutrally charged, massive, fundamental particles present in the sulfur nucleus.
And thus finally, if we have the
32
S
2
−
ion, there are 18 electrons, 16 protons, and 16 neutrons.
An atom can be defined by its properties:
Atomic number (Z): It is equal to the number of protons present in a neutral atom.Mass number (A): It is equal to the sum of the number of protons and the number of neutrons.An isotope is represented by the general notation of [tex]_Z^A\textrm{X}[/tex], where X is the symbol of an element.
For the given isotopic specie, [tex]_{16}^{34}\textrm{S}^{-2}[/tex], mass number is 34 and atomic number is 16.
Number of neutrons = Mass number - Atomic number
Put the value in the above formula.
[tex]\Rightarrow \text{Number of neutrons}=34-16\\\\\Rightarrow \text{Number of neutrons}=18[/tex]
So, the correct option is (G).
Learn more about neutrons in an atom here: https://brainly.com/question/19958244
1. A substance has a mass of 5.55 g and a volume of 3.00 cm”. Determine the density of this
substance and then use Table Sto identify the substance.
I need help please
Answer:
1.85 g per cm^3
The substance is Beryllium(if it is a single element, and not a compound)
Explanation:
Answer this please need help right now
Objects
1. Plastic Bottle
2. Plastic Bottle
Potential energy : energy obtained due to height or position (the force of gravity)
PE = mhg
g = acceleration due to gravity (m/s²)
h = height (m)
m = mass (kg)
1. Known
m = 0.5 kg
h = 1 m
g = 9.8 m/s²
then :
[tex]\tt PE=0.5\times 1\times 9.8=4.9~J[/tex]
Kinetic energy is the energy gained by an object's motion
KE = 1/2 mv²
2. To find KE, the required data are the mass and velocity
in this table, you do not display the velocity
What type of solid contains particles that are jumbled and form no particular
pattern?
A. Crystalline
B. High-pressure
C. High-viscosity
D. Amorphous
Answer: D
Explanation:
Amorphous
Answer:D
Explanation:
took the apec test
Add a neutron to create carbon-13. Is this isotope stable or radioactive?
Carbohydrates are like identification badges. Cells that have different membrane carbohydrates do different ________________. The immune system uses the carbohydrates to _____________________ that your cells belong to ________ and are not ______________________, ____________________, or other foreign cells..
Answer:
Ansmure two
ismirgonewart
are you
and de band
what is true beauty and the best
Explanation:
itu diatas jawaban nya
The type of igneous rock which has a large number of cavities
formed by gases escaping from the molten rock is called
The answer would be scoria I believe
PLEASE HELP ME IMPORTANT
what are two transition metals that start with the letter R
Answer:
Ruthenium and Rhodium
Explanation:
The ________variable is the one the experimenter has chosen to investigate
dependent
control
experimental
independent
How can we determine the constants of an experiment?
Answer:
Identify the variables and constants in your experiment. In a controlled experi- ment, a is any factor that can change. Constants are all of the factors that are the same in both the experimental group and the control group.
how to know that something is a basic oxide or acedic oxides?
plz help
Explanation:
General Rules. In general, the electropositive character of the oxide's central atom will determne whether the oxide will be acidic or basic. The more electropositive the central atom the more basic the oxide. The more electronegative the central atom, the more acidic the oxide.
1. Or what is the steering of a vehicle an example?
i Pulley
ii. Wedge
iii Wheel and axle
iv. First class lever
Answer: Wheel and axle
Explanation:
Wheel and axle is the best answer. Technically that's not the primary part that steers a vehicle though. A pulley is in the engine and I've never heard of wedge and first class lever. The question isn't too clear, but yea, I would pick ii if I was in your spot.
What makes the atomic radius change along a period in the periodic table?
A. The increased atomic mass makes the atomic radius bigger.
B. More electrons in the valence shell make the radius bigger.
C. More electrons pair in orbitals, making the atomic radius smaller.
D. More protons in the nucleus pull the electrons in, making the
atomic radius smaller
Answer:
D
Explanation:
More protons in the nucleus pull the electrons in, making the atomic radius smaller. Therefore, the correct option is option D.
The atomic radius is determined by the nucleus's balance between the attracting force of positively charged protons and the repelling force of electrons.
The most crucial element in calculating the average atomic radius is not Option A. Although atomic mass typically increases with time, increasing nuclear charge has a greater impact on atomic size.
Over time, Option B has no discernible impact on atomic radius. Although the number of valence electrons changes over time, increasing nuclear charge has the biggest impact on atomic size. The valence shell is the outermost electron shell.
The gradual decrease in atomic radius is unaffected by Option C. The most frequent electron pairing occurs within orbitals of the same energy level, and it has little impact on atomic size over a period.
Therefore, the correct option is option D.
To know more about atomic radius, here:
https://brainly.com/question/13963619
#SPJ4
Suleman a program is TV wacthing
Please correct me i will rate your answers
A; suleman is wacthing tv program
B;suleman is wacthing program tv
C; or no answer
Answer: A) Suleman is watching tv program
What is the correct name for LiF?
Answer:
Lithium Fluoride.
Explanation:I know science.
