Answer:
Explanation:
By dating the rocks in Earth's ever-changing crust, as well as the rocks in Earth's neighbors, such as the moon and visiting meteorites, scientists have calculated that Earth is 4.54 billion years old, with an error range of 50 million years
ZN + HCI —> ZnCI2+ H2
what is the reaction and is it balanced?
2. A pharmaceutical chemist runs a chromatography test on a substance
and identifies two of its components by comparing their Ry values
against certain standards. If the two components have Rf values of 1.0
and 0.41, and the solvent front has travelled 12.0 cm from the sample's
origin, what is the separation distance on the chromatogram?
Answer:
7.08 cm
Explanation:
For number 1;
Rf = d1/d2
d1/12 cm
Rf = 1.0
d1 = 12 * 1
d1 = 12.0 cm
For number 2
Rf = d1/d2
Rf = 0.41
0.41= d1/12
d1 = 0.41 * 12
d1 = 4.92 cm
Separation distance= 12.0 - 4.92 = 7.08 cm
If you freeze water, what do you get?
Answer:
Ice
Explanation:
its sooooooooooo easy
When liquid water is cooled, it contracts like one would expect until a temperature of approximately 4 degrees Celsius is reached. After that, it expands slightly until it reaches the freezing point, and then when it freezes it expands by approximately 9%.
8. Look at the following electronic configurations of elements and predict which element has the highest electron affinity? Explain your answer. [ /3A]
a. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4
b. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5
c. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
d. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1
e. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2
Answer:
e, beacause that is the higher voltage
Explanation:
calculate
What do food webs begin with as the first source of energy A plants B consumers C the sun D decomposers
Answer:
C:sun
Explanation:
When it comes to latent print deposits for fingerprints, what are the two categories of surfaces? Provide at least one example of each category.
Answer: The two categories is porous evidence and nonporous evidence. Nonporous item of evidence is when you put the latent print on the surface and it just sits on the surface. Porous item of evidence is when you put the latent print on the surface and it absorbs the latent print deposit.
The gases that make up Earth’s atmosphere are commonly referred to as air. Air consists of major gases and trace gases. What is air?
An element
A molecule
A mixture
A compound
Air is a mixture, Its constituens can be seperated
when a substance like sugar dissolves in water, the particles intermingle. This is possible because the particles of sugar
a)have spaces between them
b)have strong attractions to eachother
c)are pure
d)are vaporized
Answer:
A
Explanation:
describe a second degree burn
Answer:
Second-degree burns, or partial thickness burns, are more severe than first-degree burns. They affect the outer layer of skin, called the epidermis, and part of the second layer of skin, called the dermis. Second-degree burns can be very painful and often take several weeks to heal.
Explanation:
2Mg + O2 → 2Mgo
What is the greatest amount of MgO (in moles) that can be made with 7.8 moles of Mg and 4.7
moles of O,? Which is the limiting reactant? Which reactant is in excess, and how many moles
of it are left over?
Answer:
it would be 4.5 mole left over
Explanation:
The greatest amount of MgO will be 7.8 mole and Mg will be limiting reagent.
What is limiting reagent?The substance that would be entirely absorbed in the end of the chemical process is called as the limiting reagent.
What is mole?A mole would be defined as the quantity of a material that includes precisely 6.02214076 X [tex]10^{23}[/tex] of the particular chemical elementary entities.
Calculation of amount of MgO
The balanced chemical equation is 2 Mg + [tex]O_{2}[/tex] → 2MgO
It can be seen that 2 mole of Mg reacts with 1 mole of oxygen.
So, 7.8 mole of Mg = 7.8 / 2 = 3.9 mole of [tex]O_{2}[/tex].
Since, [tex]O_{2}[/tex] will be added in given reaction vessel will be 4.7 moles.
So, (4.7 - 3.9) = 0.8 moles of [tex]O_{2}[/tex] left but in this case Mg will be finished. Therefore, Mg will be limiting reagent.
It can be understood that 2 moles of Mg will give 2 mole of MgO.
That's why , 7.8 moles of Mg = 2 × 7.8 / 2 = 7.8 moles of MgO.
Therefore, 7.8 mole of magnesium oxide (MgO) could be generated and Mg will be limiting reagent.
To know more about limiting reagent
https://brainly.com/question/11848702
#SPJ2
What characteristics are similar between two biomes
Answer:
Niches
Explanation:
HELP MEEEEE PLEASEEEE
Which describes the molecule shown below?
O A. Unsaturated alkyne
O B. Saturated alkane
O C. Saturated alkene
O D. Unsaturated alkane
The description of the molecules shown is it is unsaturated alkynes. The correct option is A.
What are unsaturated alkynes?Alkynes are unsaturated double bond containing compound that react with hydrogen when a catalyst is present.
The pie bond shows that the hydrogen atoms are lost from the alkanes.
Thus, the correct option is A, unsaturated alkynes.
Learn more about unsaturated alkynes
https://brainly.com/question/23508203
#SPJ2
Put this equation into word form.
Answer:
2
Explanation:
symbol of postassium is k and there is no symbol k. so i guess no2
The heaviest element to be created by exothermic nuclear fusion is:
oxygen
carbon
iron
helium
Answer:
The heaviest element to be created by exothermic nuclear fusion is Iron
Explanation:
Because it is the heaviest element produced during fusion without having to add energy, and it is the lightest element produced during fission without having to add energy. Energy-wise, everything in the universe wants to be iron! Iron is the most abundant element on Earth, making up 34.5 percent of Earth's mass.
Can a combination reaction be a redox reaction
Answer:
Yes.
Explanation:
A combination reaction can be a redox reaction.
Example; C + O2 = CO2
Which of the following statements BEST explains the data in the table?
А
The acceleration determines the total distance traveled,
B
The acceleration determines the change in velocity
С
There is a constant acceleration when an object is moving,
D
The greater the velocity is of an object the greater the acceleration of the object)
Answer: b
Explanation:
How much does a 130 kg object weigh on Earth?
A 130 kg object weighs approximately, 1274 Newtons on Earth.
The weight of an object on Earth can be calculated using the formula:
Weight = mass × acceleration due to gravity
Weight is calculated by multiplying the mass of an object by the acceleration due to gravity. On Earth, the acceleration due to gravity is approximately 9.8 meters per second squared (9.8 m/s²).
In this case, we have a 130 kg object. To find its weight on Earth, we can use the formula:
Weight = mass × acceleration due to gravity
Weight = 130 kg × 9.8 m/s²
Weight = 1274 Newtons (N)
So, the weight of a 130 kg object on Earth is approximately 1274 Newtons.
Therefore, a 130 kg object weighs approximately, 1274 Newtons on Earth.
Learn more about gravity here:
https://brainly.com/question/31321801
#SPJ 4
Is this a balanced equation?
Answer:
The equation is not balanced.
Explanation:
The Law of Conservation of Matter is also called the law of conservation of mass or the Lomonosov-Lavoisier Law. This law postulates that "the mass is neither created nor destroyed, it only transforms." This means that the reactants interact with each other and form new products with different physical and chemical properties than the reactants because the atoms of the substances are arranged differently. But the amount of matter or mass before and after a transformation (chemical reaction) is always the same, that is, the amounts of the masses involved in a given reaction must be constant at all times, not changing in their proportions when the reaction ends. . In other words, then the mass before the chemical reaction equals the mass after the reaction. The exception to the rule is nuclear reactions, in which it is possible to convert mass into energy and vice versa.
This is, te law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.
Then, you must balance the chemical equation. For that, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts.
The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.
By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.
Then, taking into account all of the above, you can determine the amount of elements on each side of the equation:
Left side: 2 hydrogen H and 2 oxygen O
Right side: 2 hydrogen H and 3 oxygen O
Since the quantity of each element is different on each side of the reaction, the equation is not balanced.
The balanced equation is:
2 H₂O₂ → 2 H₂O + O₂
explain what keeps the electrons confined in the space surrounding the nuleus
Answer:
Electrons are trapped inside the atom because of the attraction forces with positively charged protons that are found in the nucleus.
do you guys know what these are? im stuck
Answer:
See explanation
Explanation:
1) From the reaction equation;
2 moles of KClO3 yields 2 moles of KCl
Hence,
4 moles of KClO3 yields 4 * 2/2 = 4 moles of KCl
2) Given that from the reaction equation, we have;
Burning 3 * 6.02 * 10^23 molecules of oxygen yields 2 * 22.4 L of CO2
Hence,
7 * 10^25 molecules of oxygen yields 7 * 10^25 * 2 * 22.4 / 3 * 6.02 * 10^23
= 313.6 * 10^25/18.06 * 10^23
= 17.36 * 10^2
= 1736 L
Which property of light does this diagram show?
is oxygen more reactive than beryllium
Answer:
Yes oxygen is more reactive than beryllium
Elemental beryllium is very unreactive towards air and water, even at high temperatures.
What fraction of a sample of ³H will be left after 36.78 years while undergoing beta decay with a half-life of 12.26 years?
Explanation:
no lo c crack solo es para poder iniciar la sección y no c ingel Jaksjs
Can you divide equation II by another factor and still have it be correct? Why or why not?
Answer:
No. You can not simplify a coefficient of.
Explanation:
:)
Please please help me!!!! I WILL GIVE BRAINLIEST
Answer:
20.0 sec
you can use ln (2)=k* t1/2 then ln N2/N1=-k(t2-t1)
or just divide 100 by 2 then 50 by 2 then 25 by 2 then 12.5 by 2 and that is 4 half lifes at 5 secs each
Explanation:
HCO3− + H2S → H2CO3 + HS−
In the reaction above, what is the Bronsted-Lowry acid?
Answer:
H₂S is the proton donor => Bronsted Acid
Explanation:
Can someone please help me
Answer:
1) 1-buten (longest carbon chain has 4 C, -en means double bond)
2) 2-penten
3) 3-methyl-2-penten
4) 3-methyl-2-buten
5) 1,1-dichlorpropen
6) 2-penten
what are invertebrate? give any three example.
Answer:
Invertebrates are animals which do not have vertibral column. They do not debelop it also. For example: Arthropods , Crawfish and Sea Urchin.
Which of these factors is involved in earthquake formation?
A. plates getting larger
B. rocks breaking
C. stress that decreases
D. faults that remain stationary
Answer:
B
Explanation:
Edge 2023
