Answer:
the zinc strip begins to darken. If left in the solution for a longer period of time, the zinc will gradually decay due to oxidation to zinc ions.
Explanation:
How does the smell of baking cookies diffuse through the house
a bucket gets filled faster at ground floor then at 2nd floor .
give reason
Answer:
because its on floor which makes it faster since the pipes dont go up and if they went up its gonna be alittle slower than the ground floor cuz in the ground floor it doesnt go Up and i think this is wrong but im sorry im not really good at explaining
Explanation:
Arrange the following in order of increasing atomic radius: Mg, Na, P, Si, and Ar.
Answer:
Ar, P, Si, Mg, Na
Explanation:
Ar=106pm
P=107pm
Si=111pm
Mg=141pm
Na=166pm
Na>Mg>Si>P>Ar is the order of increasing atomic radius.
What are elements?Elements are the simplest substances which cannot be broken down using chemical methods.
Atomic radii vary in a predictable way along or across the periodic table. The atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus we can say that helium is the smallest element, and francium is the largest.
Ar=106pm
P=107pm
Si=111pm
Mg=141pm
Na=166pm
Hence, Na>Mg>Si>P>Ar is the order of increasing atomic radius.
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Hannah added a silvery white metal to a beaker of cold water and noticed that
gas bubbles were given off and a different substance formed. When she
repeated the activity with hot water she noticed the gas bubbles were released
much more rapidly. Which statement best explains why the reaction occurred
faster in hot water?
A ) Hot water increases the collision rate of the molecules, causing the
reaction to occur faster.
B ) Hot water changes the concentration of the chemicals, causing the
reaction to occur faster.
C ) Hot water increases the surface area of the molecules, causing the reaction
to occur faster.
D ) Hot water changes the chemical composition of the water molecules,
causing the reaction to occur faster.
Answer:
A. Hot water increases the collision rate of the molecules, causing the
reaction to occur faster.
Explanation:
Hot water molecules move faster than cold water molecules.
Use the model to answer the question.
Which element symbol actually represents the model?
Plz answer
Answer:
B
Explanation:
Boron has 5 protons.
It is important to understand the differences between chemical and physical changes. Chemical changes result in new substances, but physical changes do not. Which process is an example of a physical change?
Answer:
Melting of ice
Explanation:
A physical change is one in which just the physical properties of the matter is altered. Most phase changes reaction falls under this type of change.
Examples are boiling, melting, freezing, condensation, sublimation, magnetization of metals, breaking glass, cutting wood. No new kinds of matter is formed. The process is reversibleNo change in masswhat happens to crayons when heated?
they become liquified
What do you think makes fireworks different colors?
Answer:
So I searched it up and got, "They're created by the use of metal salts. ... Metal salts commonly used in firework displays include: strontium carbonate (red fireworks), calcium chloride (orange fireworks), sodium nitrate (yellow fireworks), barium chloride (green fireworks) and copper chloride (blue fireworks)."
WHY WAS I THINKING OF PAINT-
Explanation:
Have a great day though:)
What causes rain to precipitate from clouds?
Answer: Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. When the drops are heavy enough, they fall to the Earth.
Explanation: Have a blessed day!
Answer: Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. When the drops are heavy enough, they fall to the Earth.
Explanation:hope this helps u
Which of the following landforms is created by erosion?
-Glacier Valleys
-Hoodoos
-Deltas
-Moraines
please help me out owo
Answer:Delta
Explanation:
Where does shearing often occur?
Answer:
Shearing commonly occurs along the edges of tectonic plates, although it may occur in other places as well. Most often it takes place between 10 and 20 kilometers beneath the earth's surface. If the same process occurred at the surface, it would result in fracturing and faulting.
Explanation:
Answer:
Now if u could give us all the questions u got right! lol 8
Explanation:
which of the following pair of elements could not react to form an ionic compound
co and br
c and o
k and f
ag and o
Answer:
c and o
Explanation:
Carbon and Oxygen cannot react to form an ionic compound because the two elements are non-metals.
To form an ionic bond, a metal combines with a non-metal through electrostatic attraction of oppositely charged ions. This leads the bond formation. Carbon is a non-metal, with oxygen, they will prefer to form a covalent bond where they share their electronsThe pair of elements that could not react to form an ionic compound is C and O. Thus option B is correct.
Ionic compounds are formed by the electrostatic interaction of the metal atom with a non-metal. The ionic bonds are weaker bonds and are easily dissociated in the water.
The ionic compounds can be:
CO and Br are metal and nonmetal with different charges, and thus form the ionic compound.C and O, both are non-metals, and thus will not form an ionic compound.
K and F, having K as metal and F as a nonmetal forming the ionic compound.
Ag and O, have a metal and a nonmetal and have been able to form an ionic compound.
The pair of elements that could not react to form an ionic compound is C and O. Thus option B is correct.
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Ella makes this table to organize her notes on whether atoms gain or lose energy during the changes of state.
A 2-column table with 2 rows. The first row has entries Gain Energy, Lose Energy. The second row has entries nothing, nothing.
Which changes of state should she place in the column titled "Lose Energy"?
freezing, boiling, and melting
melting, vaporization, and sublimation
sublimation, deposition, and condensation
freezing, deposition, and condensation
Answer:
D
Explanation:
I took the test
Answer:
D took the test
Explanation:
29. What is the noble gas configuration for tellurium?
Answer:
[Kr] 4d10 5s2 5p4 is the electronic configuration for tellurium.
Electrons per shell: 2,8,18,18,6
Atomic number: 52
Symbol: Te
A 200.0-mL sample of helium gas is in a cylinder with a movable piston at 110 kPa and 275 K. The piston is pushed in until the sample has a volume of 95.0 mL. The new temperature of the gas is 310. K. What is the new pressure of the sample?
51.1 kPa
261 kPa
249 kPa
274 kPa
Answer:
P₂ = 261 KPa
Explanation:
Given data:
Volume of sample = 200 mL
Initial pressure = 110 KPa
Initial temperature = 275 K
Final volume = 95 mL
Final temperature = 310 K
Final pressure = ?
Solution:
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₂ = P₁V₁T₂ /T₁ V₂
P₂ = 110 KPa× 200 mL× 310 K /275 K × 95 mL
P₂ = 6820000 KPa / 26125
P₂ = 261 KPa
What is the total number of grams of a 32-gram sample of 32P remaining after 71.5 days of decay?
Answer:
1 g
Explanation:
The following data were obtained from the question:
Original amount (N₀) = 32 g
Time (t) = 71.5 days
Half-life of phosphorus (t½) = 14.3 days
Amount remaining (N) =?
Next, we shall determine the rate of disintegration. This can be obtained as follow:
Half-life of phosphorus (t½) = 14.3 days
Decay constant (K) =?
K = 0.693 / t½
K = 0.693 / 14.3
K = 0.0485 /day
Finally, we shall determine the amount remaining as illustrated below:
Original amount (N₀) = 32 g
Time (t) = 71.5 days
Decay constant (K) = 0.0485 /day
Amount remaining (N) =?
Log (N₀/N) = Kt/2.303
Log (32/N) = 0.0485 × 71.5 / 2.303
Log (32/N) = 3.46775 / 2.303
Log (32/N) = 1.5058
Take the antilog of 1.5058
32/N = antilog (1.5058)
32/N = 32.05
Cross multiply
32 = N × 32.05
Divide both side by 32.05
N = 32 / 32.05
N = 0.998 ≈ 1 g
Thus, the amount remaining after 71.5 days is approximately 1 g.
The half-life of a radioactive substance refers to the time taken for the substance to Decay to half of its initial size. Hence, the mass of the substance left after 71.5 days is 1 gram.
Initial mass = 32 g Half life = 14.3 daysAfter 14.3 days ;
32 / 2 = 16 gramsAfter 14.3 × 2 = 28.6 days :
16/2 = 8 gramsAfter 14.3 × 3 days = 42.9 days :
8 / 2 = 4 gramsAfter 14.3 × 4 days = 57.2 days :
4 /2 = 2 gramsAfter 14.3 × 5 days = 71.5 days :
2 /2 = 1 gram.Hence, the mass of the sample left after 71.5 days would be 1 gram.
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Mass spectrometry is more often applied to molecules than to atoms. We will see in Chapter that the molecular weight of a molecule is the sum of the atomic weights of the atoms in the molecule. The mass spectrum of H is taken under conditions that prevent decomposition into H atoms. The two naturally occurring isotopes of hydrogen are H (atomic mass = 1.00783 amu; abundance 99.9885%) and H (atomic mass = 2.01410 amu; abundance 0.0115%). How many peaks will the mass spectrum have? Give the relative atomic masses of each of these peaks. (c) Which peak will be the largest, and which the smallest?
Answer:
See explanation
Explanation:
There will be three peaks. The relative masses of each of the peaks is shown below;
1H - 1H peak will have a mass of 2*1.00783 amu = 2.01566 amu
1H -2H peak will have a mass of 1.00783 amu + 2.01410 amu = 3.02193 amu
2H - 2H peak will have a mass of 2*2.01410 amu = 4.0282 amu
The 2H - 2H peak is the smallest while 1H - 1H peak is the largest.
Why is the cell a basic unit of life?
Answer:
Cells make up the smallest level of a living organism such as yourself and other living things. The cellular level of an organism is where the metabolic processes occur that keep the organism alive. That is why the cell is called the fundamental unit of life.
Explanation:
put it in your own words
perform the following operation and express the answer in scientific notation
Answer:
2×10⁻⁴
Explanation:
Given data:
2.8 ×10⁻⁶ + 1.4×10⁻²
Solution:
2.8 ×10⁻⁶ + 1.4×10⁻²
2×10⁻⁶⁺²
2×10⁻⁴
Scientific notation is the way to express the large value in short form.
The number in scientific notation have two parts.
. The digits (decimal point will place after first digit)
× 10 ( the power which put the decimal point where it should be)
for example the number 6324.4 in scientific notation will be written as = 6.3244 × 10³
What is the oxidation state of Hg in Hg2Cl2?
Answer:
+1
Explanation:
Electrochemistry. In oxidation–reduction (redox) reactions, electrons are transferred from one A redox reaction is balanced when the number of electrons lost by the reductant Hg(l)∣Hg2Cl2(s)∣Cl−(aq) ∥ Cd2+(aq)∣Cd(s).
As is evident from the Stock number, mercury has an oxidation state of +1. This makes sense, as chlorine usually has an oxidation state of -1.
The oxidation state of Hg in Hg₂Cl₂ compound is +1 as both subscripts of elements are eliminated.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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Describe the current model of the atom. Name the parts of this model and describe each part.
Answer:
the electron cloud model is the current model of atom
write the correct representation of an element x which contains 12 electrons and 16 neutrons
Answer:
²⁸Mg
Explanation:
12 electrons means it is a Mg;
A typical Mg has 12 neutrons, but this has 16 hence it must be an isotope with 4 extra neutrons.
For the following reaction:
N2 + 3H2 -> 2NH3
What mass of NH3 can be produced from 14.9g N2 and 3.8 g H2 ?
Answer:
Nitrogen is the limiting reactant, and
3.74
grams of ammonia is formed.
Explanation:
We have the familiar Haber process equation...
N
2
(
g
)
+
3
H
2
(
g
)
⇌
2
N
H
3
(
g
)
Since the mole ratio of
N
2
to
H
2
is
1
:
3
, then for every mole of nitrogen, we would need three moles of hydrogen.
Explanation:
How many atoms are represented in NH4
Answer:
5 atoms
Explanation:
it has 4 hydro atoms and 1 nitrogen atom therefore it is 5
Answer:
the answer is 14
Explanation:
i just took the test on Edg an i got it right
a girl pose a spoonful of sugar into a glass of warm water water into the sugar disappears when she choose the water you notice that it t is now suite which describes the kind of matter in the glass
A=Compound
B=An element
C- soultion
d- sUBTANCE
Answer:
Solution!
Explanation:
Becuase the water didn't change when the sugar was mixed in. :)
A. to hold and protect the cells DNA
B.to store food and other materials inside a cell
C. to store enzymes that Break down food
D. to use energy from sunlight to make surgars
I'll give you brainliest and 5 stars if your right
The system brings molecules to the cells. It includes blood vessels and the heart.
respiratory system
digestive system
circulatory system
nervous system
I need some help with this
Plzzzzzzzz help Which species is a index fossil
Answer:
e
Explanation:
it's in the index fossil range
Answer:
Explanation:
In marine strata, index fossils that are commonly used include the single-celled Protista with hard body parts and larger forms such as ammonoids. In terrestrial sediments of the Cenozoic Era, which began about 65.5 million years ago, mammals are widely used to date deposits.
Why are liquid and gas molecules different