Answer:
Explanation:
As relative molecular mass of molecule increases its rate of diffusion decreases . Mr of HCl is 1+35.5=36.5 which is greater than Mr of NH3 which is only 14+3=17. As HCl is heavier it'll diffuse at a lower rate so travel less distance whilst NH3 will cross a greater distance as it diffuses faster so white solid appears closer to HCl that is approximately B.
8Li
8 Be
0e
What type of radioactive decay is this?
Answer:
emitted i think
Explanation:
To determine the type of radiation (alpha, beta or gamma), first determine the background count rate, then the source count rate with no absorber. Next, place a sheet of paper between the source and the monitor. If the counts are significantly reduced, the source emits alpha particles.
Answer:
Plasma Levels of IL-8 and TGF-β1 Predict Radiation-Induced Lung Toxicity in Non-Small Cell Lung Cancer: A Validation Study
Explanation: got it from sources
What is the chemical name for Cu(NO3)2
Answer:
The chemical name is Copper(II) nitrate
Explanation:
How many moles of gold, a U, are in 3.60×10^-5 G of gold?
Answer:
See Below.
Explanation:
This is a conversion problem:
Using the molar mass of Gold (given in a periodic table) which is 196.97g/mol
you have
[tex](3.60*10^-5 g) *\frac{1moles}{196.97g}[/tex]
you always arrange the equation in a way to cancel whatever you don't want (grams) and leave what you do want (moles). Here grams cancel (top and bottom), so you're left with:
[tex]\frac{(3.60*10^-5 g) *(1)}{196.97} = 1.83*10^-7[/tex] moles of Gold
Observe: Scandium is the first element to contain electrons in the d subshell. How many orbitals does the d subshell have, and how many electrons can fit in the d subshell?
Answer: 5 orbitals
Explanation:
Each d subshell has 5 orbitals, with 10 electrons. So it's like for every orbital, there are 2 electrons. Look at orbital diagrams (if your teacher made you draw them), and you will see that an arrow pointing both UP AND DOWN represent 2 electrons (arrow upward=1 electron, arrow downward=1 electron)
Here, we are required to determine how many orbitals does the d subshell have, and how many electrons can fit in the d subshell.
The d subshell has 5 orbitals.The number of electrons that can fit in the d subshell is; 10 electronsThe d subshell is first recorded in the shell with energy level 3.
The orbitals in an atom are organized into different layers or electron shells. The d subshell has 5 orbitals in it.
This is evident from the formular; 2l + 1.
where l = 2 for the d subshell.
As with any sub-orbital, the sub-orbitals in the d-subshell also contain 2 electrons each.
According to Pauli's exclusion principle, the two electrons in each must have opposing spin.
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Which of the following is considered a sign of a chemical change?
What type of heat transfer happens in the Inner Core?
Answer: Conduction
Explanation:
Calculate the number of moles of neon gas in 8.15 x 10^24 atoms of neon gas.
1.35 moles Ne
0.135 moles Ne
135 moles Ne
13.5 moles Ne
Answer:
13.5 moles of Ne
Explanation:
1 mole of any gas contains 6.02 x 10²³ atoms of gas
6.02 x 10²³ atoms of neon is equal to 1 mole of neon .
8.15 x 10²⁴ atoms of neon is equal to 1 x 8.15 x 10²⁴ / 6.02 x 10²³ moles
= 8.15 x 10²⁴ / 6.02 x 10²³ mole o neon
= 13.5 moles of Ne .
Which of these reactants will produce a precipitate if they react?
NaC2H3O2+ HCI
NaOH + HCI
NaNO3 + CaCl2
KOH + Mg(NO3)2
Answer:
KOH+Mg(NO3)2
Explanation:
The double replacement reaction will result in:
2KOH(aq) + Mg(NO3)2[tex]\\[/tex](aq)--> 2KNO3(aq) + Mg(OH)2(s)
Solubility rules prove that Mg+OH^- is insoluble and will result in a precipitate (solid)
How does a scientific theory compare to a scientific law?
Answer:
Explanation:
Scientific theory is an in-depth explanation of the observed phenomenon. A law is a statement about an observed phenomenon or a unifying concept.
HURRY PLS!
A wave has a wavelength of 915 meters. what is the frequency of the light?
Answer:
327.8689 (Hz)
0.3279 (KHz)
0.0003 (MHz
0 (GHz)
1. Compare the masses and the charges for the three particles which make
up
the atom.
Answer:
The charge on a neutron=1+-/neutral
It has a mass 1
The charge on electron is 1-/negative
It's mass is 1/1840
The charge on a proton is 1+
It has a mass 1 too.
Explanation:
The Mass of the mineral is 9.6 grams . The mineral is placed in a graduated cylinder containing 8.0 ml of water . The water rises to 16.0 ml of water. What is the Density of the mineral ?
Answer:
1.2 g/ ml
Explanation:
The volume of the mineral = increase in volume of the water whuich is 16 - 8 = 8mls.
Therefore the mineral's density = 9.6 / 8
= 1.2 g/ ml answer
What physical property of the metal rods was being tested during step 4 of the procudure?
4. Measure and record how long it takes heat from the hot plate set on "high" to melt the wax ball.
A.
magnetism
B.
thermal conductivity
C.
electrical conductivity
D.
density
Answer:
B. thermal conductivity
Explanation:
They physical property being tested during the fourth step is the thermal conductivity of the materials.
Thermal conductivity is the ability of a body to transmit heat energy from one place to another.
Since we are measuring how long it takes for heat from the hot plate to reach the wax ball, this is a typical experiment for measuring thermal conductivity. Most metals are good conductors and heat energy moves fast in them.Non-metals are poor conductors with low thermal conductivity.
Which of the following molecules has a trigonal planar shape?
Answer:
BF 3
Explanation:
The geometry of the BF 3 molecule is called trigonal planar The fluorine atoms are positioned at the vertices of an equilateral triangle. The F-B-F angle is 120° and all four atoms lie in the same plane.
Answer:
BF3
Explanation:
A p ex
use the facts that water has a higher specific heat than rock (such as Granite) to explain the differences in the temperature curves for the two cities in the graph.
Since water has a high specific heat, that results in water being able to store/require more energy in order to change it’s temperature. Since San Francisco is so close to water, that would mean that it’s temperature should vary less since water would be able to keep the temperature around the same value even if there was an increase or decrease in thermal energy.
a cylindrical object has a diameter of 1.25 cm and a height of 6.48 cm. what is its volume?
The volume of cylinder = 7.948 cm³
Further explanation
Volume is a derivative quantity derived from the length of the principal
The unit of volume can be expressed in liters or milliliters or cubic meters
The volume of the aquarium is almost the same as the beam namely:
V = length x width x height
The volume of a cylinder can be formulated :
[tex]\tt V=\pi.r^2.h[/tex]
r = radius
h = height
radiusDiameter of cylinder = 1.25 cm
radius=r :
[tex]\tt \dfrac{1.25}{2}=0.625~cm[/tex]
volume[tex]\tt V=\pi\times 0.625^2\times 6.48\\\\V=\boxed{\bold{7.948~cm^3}}[/tex]
change word equation into chemical equation.
a Calcium carbonate -----> Calcium oxide + Carbon dioxide
b Zinc + Sulphuric acid -----> Zinc sulphate + Hydrogen
Answer:
Ca(CO3) --> CaO + CO2
Zn + H2SO4 --> ZnSO4 + 2H2
Explanation:
^^^
Identify each of the changes listed below as chemical or physical.
Evaporation of Water ________________
Digesting Food ______________________
Rotting Wood ______________________
Rusting Car ______________________
Drying Clothes ______________________
Souring Milk ______________________
Baking a Cake ______________________
simplify 2²×2³ someone plz help
Answer:
[tex]2^5[/tex] or 32
Explanation:
The rule for exponents is that [tex]x^a*x^b = x^{a+b[/tex]. Thus, we have a+b = 5 so the answer is 2^5 or 32
Please help me, I am struggling please help
How many d electrons does I (atomic number
53) possess?
1. 10
2. 5
3. 8
4. 0
5. 20
6. 53
7. 16
Answer:
6. 53 is the answer. Hope this helps:)
The number of d electrons that an atom of atomic number 53 possess are 20. Thus, the correct option for this question is 5.
What is an Atomic number?An atomic number may be defined as the number of protons in the nucleus of an atom that significantly represents the characteristic of a chemical element and determines its specific place in the modern periodic table.
According to the modern periodic table, an element that has an atomic number of 53 is known as Iodine. Its electronic configuration is [tex]1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2, 3d^1^0, 4p^6, 5s^2, 4d^1^0, 5p^5[/tex]. Thus, according to this electronic configuration, the total number of d electrons are [tex]3d^1^0 and 4d^1^0[/tex].
Therefore, the number of d electrons that an atom of atomic number 53 possess are 20. Thus, the correct option for this question is 5.
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I will give brainliest !
Which of the following is NOT an example of how biotic factors interact with abiotic factors in an ecosystem?
A) Plants remove carbon dioxide from the air and add oxygen.
B) Animals cause erosion by digging in the dirt.
C) A lion preys on a herd of gazelle.
D) A lizard raises its body temperature by using heat from the Sun.
Answer:
C
Explanation:
I had the same answer during school and the teacher said it was correct but if it isnt I'm super sorry
A lion preying on a herd of gazelle is not an example of how biotic factors interact with abiotic factors in an ecosystem.
What is an ecosystem?
Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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HELPPP MEE I NEED HELPP PLEASE
Which person participates mostly in the quaternary level of an economy?
A. A coal miner
3. A car mechanie
C. A college professor
D. A car factory worker
SUBMIT
Answer:
B.Michanine
Explanation:
Answer: The answer is a college professor since people in the fourth level of industry create, share, and store information. They do research, give advice, report on events, and keep records. Furthermore, workers in the quaternary include teachers, librarians, accountants, scientists, and reporters, nor do the traits describe coal miners, car machines, and a car factory worker as these are the secondary level since their work involves manufacturing, make sure to study! You got this have a g’day. Again, the answer is C: A college professor.
Explanation:
Explain why the mass number of oxygen is 16
Answer:
Oxygen has an atomic number of 8 , and the mass number of an atom is the sum of its atomic number plus its neutron number. We got the mass as 16 units, and so it'll have 16−8=8 neutrons.
Explanation:
How many moles are in 5.25 X 10 25
atoms of Au?
Answer:
The answer is 87.21 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{5.25 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 87.2093023...[/tex]
We have the final answer as
87.21 molesHope this helps you
A sample of a gas occupies 6.00 liters at a temperature of 200 K. If the pressure remains constant and the temperature is raised to 600 K, the volume of gas sample would be 1.)18.0 L 2.)2.00 L 3.)3.00 L 4.)12.0 L
Answer:
18
Explanation:
The volume of the gas should be 1. 18.0 L
Calculation of the volume of the gas;Since A sample of a gas occupies 6.00 liters at a temperature of 200 K. If the pressure remains constant and the temperature is raised to 600 K
So here the volume of the gas should be
= 600 * 6 /200
= 18.0 L
hence, the first option is correct.
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How many significant figures does this measurement contain? 0.0000508800 Gm
Answer:
There are 6 significant figures
Answer:
6 significant figures
Explanation:
When counting significant figures, start on the left with the first non-zero number. Count all numbers that fall between non-zero numbers. Count all zeros after a 1-9 and after the decimal.
What happens to the atomic radius when an electron is lost?
A. The positive ionic radius is the same size as the neutral atomic
radius.
B. The positive ionic radius does not follow a trend with the neutral
radius.
C. The positive ionic radius is smaller than the neutral atomic radius.
D. The positive ionic radius is larger than the neutral atomic radius.
Answer:the positive ionic radius is smaller than the neutral atomic radius
Explanation:
Answer:The positive ionic radius is smaller than the neutral atomic radius.
Explanation: just took the test
4. Advection fog forms when warm moist air comes in from the Pacific Ocean and
blows over the cold California current.
A.True
B.False
Answer:
A, True
Explanation:
Plz help! The best answer will be marked as brainliest!
Make a funny sentence for the beneficial or great uses of magnesium
I DON¨T WANT A MEME!
Here is an example for Mercury, it HAS to for Magnesium
¨I have a long history of use in fluorescent lighting so I can light up any room ¨
Answer:
"Like when people say like im a party fowl but I'm like OMg, I'm like the reason everyone loves the 4th of July like I am 4th of July.
Explanation:
As magnesium ignites easily in air and burns with a bright light, it's used in flares, fireworks and sparklers. I imagine Magnesium talks like a valley girl lol.