Answer: 1
Explanation: This is true.
What is the formula for dinitrogen pentoxide?
A) NO5
B) N5)2
C) N2O5
D)N2O7
Pls help with science
A piece of charcoal is found to contain
30% of the carbon 14 that it originally
had. When did the tree die from which the
charcoal came? use 5600 years as the
half-life of carbon 14.
A) 9709.46
B) 9708.33
C) 9708.34
D) 9709.45
Answer: The tree died 9709.46 years before.
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant = 100
a - x = amount left after decay process = [tex]\frac{30}{100}\times 100=30[/tex]
a) to find rate constant
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{5600years}=1.24\times 10^{-4}years^{-1}[/tex]
b) to know the age
[tex]t=\frac{2.303}{1.24\times 10^{-4}}\log\frac{100}{30}[/tex]
[tex]t=9709.46years[/tex]
The tree died 9709.46 years before.
What is an important effect of gravity?
A. It causes radioactive particles to split off from the nucleus.
B. It is responsible for charge attraction.
C. It keeps the nucleus of the atom together.
D. It maintains the distances between planets.
SUBMIT
Answer:
d. It maintains the distances between planets.
Explanation:
How many mililiters are there in a .5 M solution in which 60 grams of Li?
Answer:
10
Explanation:
Help! I need help on how to do these problems.
Answer:
a. 3; b. 5; c. 10; d. 12
Explanation:
pH is defined as the negative log of the hydronium concentration:
pH = -log[H₃O⁺] (hydronium concentration)
For problems a. and b., HCl and HNO₃ are strong acids. This means that all of the HCl and HNO₃ would ionize, producing hydronium (H₃O⁺) and the conjugate bases Cl⁻ and NO₃⁻ respectively. Further, since all of the strong acid ionizes, 1 x 10⁻³ M H₃O⁺ would be produced for a., and 1.0 x 10⁻⁵ M H₃O⁺ for b. Plugging in your calculator -log[1 x 10⁻³] and -log[1.0 x 10⁻⁵] would equal 3 and 5, respectively.
For problems c. and d. we are given a strong base rather than acid. In this case, we can calculate the pOH:
pOH = -log[OH⁻] (hydroxide concentration)
Strong bases similarly ionize to completion, producing [OH⁻] in the process; 1 x 10⁻⁴ M OH⁻ will be produced for c., and 1.0 x 10⁻² M OH⁻ produced for d. Taking the negative log of the hydroxide concentrations would yield a pOH of 4 for c. and a pOH of 2 for d.
Finally, to find the pH of c. and d., we can take the pOH and subtract it from 14, giving us 10 for c. and 12 for d.
(Subtracting from 14 is assuming we are at 25°C; 14, the sum of pH and pOH, changes at different temperatures.)
What do these observations tell you about the rate and direction of heat flow through each specific type of plastic?
Answer:
Heat is something you can't control
Explanation:
Plastic is something you could control like moving it around
How many moles are in 7.00 x 10^24 atoms of N. Watch your significant figures
11.6 moles N
12.0 moles N
11 atoms N
11.6 atoms N
Answer:
11 atoms N
Explanation:
Please I neeed help, I have to write: four ammonia molecules (NH3) react with four oxygen molecules(O2) to form four nitrogen monoxide molecules (NO) and six water molecules. All substances are in gaseous state and heat is released in the chemical reaction
Explanation:
the equation must be
4NH3 + 5O2–> 4NO + 6H2O
Why would people with sickle-cell anemia get tired more easily than healthy people?
Explanation:
Because sickle-cells have trouble traveling through the smallest blood vessels, which means that muscles and tissue are not getting oxygen they need.
Balance the equation NaHCO3(s)....
Please help!!
Question #1
Answer:
NaHCO3 → H2O + CO2 + Na2CO3
Explanation:
The points labeled on the chart below represent the approximate size of Earth, the Milky Way, the Moon, and the Sun. The approximate size of the Solar System is also shown.Space Size Which point on the chart best represents the approximate size of the Sun? Question 5 options: W X Y Z
Answer:
The answer is Y
Explanation:
:p
Zinc reacts with nitric acid to produce hydrogen gas and zinc nitrate, Zn(NO3)2. 10.00 grams of zinc react with 7.84 grams of nitric acid. How many grams of excess reactant remain?
Answer:
Zn is the excess reactant and remain 5.94g
Explanation:
The reaction of Zn with HNO3 is:
Zn + 2 HNO3 → H2 + Zn(NO3)2
1 mole of Zn reacts with 2 moles of HNO3
To solve this question we must convert the mass of each reactant to moles in order to find limiting reactant. Thus, we can kknow the moles of excess reactant that will not react:
Moles Zn -Molar mass: 65.38g/mol-:
10.00g * (1mol / 65.38g) = 0.1530 moles Zn
Moles HNO3 -Molar mass: 63.01g/mol-:
7.84g * (1mol / 63.01g) = 0.124 moles HNO3
For a complete reaction of 0.124 moles of HNO3 are required:
0.124 moles HNO3 * (1mol Zn / 2 mol HNO3) = 0.0622 moles Zn. As there are 0.1530 moles, Zn is the excess reactant and will remain:
0.1530 moles - 0.0622 moles = 0.0908 moles Zn
The mass is:
0.0908 moles Zn * (65.38g / mol) =
5.94gNumber 12 plsssssssssssssssssss
Answer:
check my explanation
Explanation:
it is the secondary consumer because it doesn't eat grass
What type of chemical replacement is RbNO3 + BeF2 →Be(NO3)2 + RbF
Answer:
Double replacement
Explanation:
A ________________ uses chemical formulas to model what happens in a chemical reaction.
Pick 1 of the following
molecule compound
chemical equation
chemical reaction
new chemical
Answer:
Explanation:
Chemical equation
what is the enthalpy of the overall chemical reaction ch4(g)+4cl2(g)- ccl4(g)+4hcl(g)?
1. -205.7kj
2. -113.4kj
3. -14.3kj
4. 78.0kj
Answer:
-205.7kj
Explanation:
Now adding reaction 2 and twice of reaction 3 and reverse of reaction 1, we get the enthalpy of the reaction.
The expression for enthalpy for the following reaction will be,
where,
n = number of moles
Now put all the given values in the above expression, we get:
Therefore, the enthalpy of the following reaction is, -205.7kj
In the illustration, which solute will dissolve first?
00.0
00.0
tanka
tank
Solute in Tanks A and B will dissolve at equal rates.
Solute in Tonk Awill dissolve first
Soluten Tork B wil dissolves
The first to dissolve is the solute in tank B. The amount of a substance that dissolves in a specific solvent concentration at a specific temperature is known as its solubility.
Which phase of the dissolving process is the first?The introduction of a solute to a solvent is the first stage in the dissolving process. The molecules of these two substances begin to interact, causing the solute molecules to disperse and become encircled by solvent molecules.
Which of the following three compounds dissolves in water?In water, salt, sugar, and coffee all dissolve. They disintegrate quickly. They typically dissolve more rapidly and completely in hot or warm water. Even very hot water won't be able to dissolve sand or pepper.
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Mosquitoes breed in areas where there is often standing, still, svampy, water. Mosquitoes can cause malaria and other harmful diseases to humans and animals. Without causing damage to an existing ecosystem, what could you do to help control the current mosquitoes and their larvae? (what would eat them ?)
Answer:
Many natural scents that are appealing to humans actually repel mosquitoes, including lavender, peppermint, basil, and eucalyptus. Many of these scents can be worn as an essential oil on your skin to help keep these pesky pests from biting you.
hi everyone want me to answer your modules? from grade 7-8
i kinda want to do just a small bussiness so i can help with my mom for my tuition if you do message me in messenger name Kaczara Kisha Eimerh Rosales all you have to do is pay me maybe about atleast 20-30 pesos i really appriciate it if you do
Answer:
addd me :)
Explanation:
hehehehehe
Answer:
cool. No problem ◉‿◉◉‿◉◉‿◉◉‿◉◉‿◉◉‿◉◉‿◉
can someone do the rest of this for me i missed school the day we did it
Answer:
This is the answer
Explanation:
Tyler is running down the street after his brother at a speed of 1.2 m/s and contains 10.8 J of kinetic energy. Calculate Tyler’s mass
Answer:
I do not know
Explanation:
I am vert sorry but I do not know the answer.
The subject is science I need you’re help plsssss
Answer:
sweat is the water that comes out of your body when you workout
Help me in this question please (No links!!.)
Answer:
Density = mass/volume so the answer is 6g/ml
Explanation:
your friend says that there is a kind of fue that only dries when it is exposed to a special type of light.can light cause glue to dry?
Answer:
No. Light is not a physical thing, so it cannot change physical things like glue.
Explanation:
Light is not effective at all to glue, it doesn't do anything at all.
8. Shanice made a list about alkali metals.
Alkali Metals
Jose one electron
are found in
group one
include elements
Li, Na, and K
ions will have a
negative one
charge
Shanice made a mistake on her list. Which
best describes the mistake Shanice made?
A. Alkali metals do not lose one electron,
they gain one electron
B. Alkali metals are not found in group one;
they are found in group two.
C. Alkali metals do not include elements Li.
Na, and K, they include Al, Si, and P.
D. Alkali metal ions will not have a negative
one charge; they will have a positive one
charge
Answer:
D. Alkali metal ions will not have a negative one charge; they will have a positive one charge
Explanation:
Alkali metals are a found towards the left hand side of the periodic table. The comprise of Li, Na, K, Rb, Cs and Fr.
They form univalent positive ions such as Cs^+, Na^+ etc. They do not form negative ions but give out one electron to form the sort of ions stated above. Recall that metals are electropositive in nature (donate electrons).
The mistake made by Shanice is to say that group 1 elements have a negative one charge.
is saturated fat the same as trans fat?
Answer:
Saturated fat occurs naturally in red meat and dairy products. It's also found in baked goods and fried foods. Trans fat occurs naturally in small amounts in red meat and dairy products. Trans fat can also be manufactured by adding hydrogen to vegetable oil.
Help me please!
What is the solubility of KNO3 in 100g of water at 60°C?
A.
28 grams/100g of H2O
B.
45 grams/100g of H2O
C.
108 grams/100g of H2O
D.
38 grams/100g of H2O
Answer:
C. 108 grams/100g of H2ORequired number is the vertical coordinate of the intersection point of a line at 60°C with the graph of the KNO₃.
What two reactants are necessary in order for a hydrocarbon combustion reaction to take place?
Answer:
A hydrocarbon and oxygen
Explanation:
hydrocarbon is being burned, and oxygen is necessary to burn things
To solve such this we must know the concept of Combustion reaction. The two reactants that are necessary in order for a hydrocarbon combustion reaction to take place are hydrocarbon and oxygen.
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side.
Combustion reaction is a reaction in which a substance, basically hydrocarbons burns in presence of oxygen to produce carbon dioxide and water. The two reactants that are necessary in order for a hydrocarbon combustion reaction to take place are hydrocarbon and oxygen.
Therefore, hydrocarbon and oxygen are two reactant that are necessary in order for a hydrocarbon combustion reaction to take place.
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BRAINLIESTT
The pH of a solution is 8.43. What is it {H3O+}concentration?
A. 3.7 x 10-3
B. 2.7 x 10-6
C. 1.0 x 10-14
D. 1.0 x 10-8.43
Answer:
D. 1.0 x 10-8.43
Explanation:
The pH is an unit of concentration in chemistry used to determine the acidity -or basicity- of a particular solution. Is used in quality control to determine the security of a product for consumers.
The equation is:
pH = -log [H₃O⁺]
As pH = 8.43:
8.43 = -log [H₃O⁺]
10^-8.43 = [H₃O⁺]
1.0x10 -8.43 = [H₃O⁺]
Right option is:
D. 1.0 x 10-8.43