What is the percent composition of nitrogen in a 2.57 g sample of Al(NO3)3?
Answer:
19.8% of Nitrogen
Explanation:
In the Al(NO₃)₃ there are:
1 atom of Al
3 atoms of N
And 9 atoms of O
The molar mass of Al(NO₃)₃ is:
1 Al * (26.98g/mol) = 26.98g/mol
3 N * (14g/mol) = 42g/mol
9 O * (16g/mol) = 144g/mol
26.98 + 42 + 144 = 212.98g/mol
We can do a conversion using these molar masses to find the mass of nitrogen is the sample, that is:
2.57g * (42g/mol / 212.98g/mol) =
0.51g N
Percent composition of nitrogen is:
0.51g N / 2.57g * 100
= 19.8% of Nitrogen
Please help me!! If you do thank you
Answer:
True
Explanation:
.
An underground layer of rock or pieces of rock
that holds water is a(an)?
Answer:
An aquifer
Explanation:
here's your answer
Answer:
aquifer
Explanation:
solid rock that holds ground water is cold aquifer
How many c atoms are there in 5K2CO3
Answer:
8 atoms.
Explanation:
1. What is an indicator and how does it work?
Answer:
Chemical indicator, any substance that gives a visible sign, usually by a color change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow color to an alkaline solution.
Factories that produce cement account for around 5% of global emissions of carbon dioxide worldwide. Carbon dioxide is a greenhouse gas that absorbs solar radiation and rereleases it into Earth's atmosphere.
Cement production has increased over time because the demand for cement has increased. Suppose that cement production continues to increase significantly over the next 50 years. Assuming that all other factors remain the same, what impact will this most likely have on the Earth?
A Gas other than carbon dioxide will become more concentrated in the atmosphere.
B Global temperatures on Earth will increase.
C Global temperatures on Earth will decrease.
D Gases other than carbon dioxide will become depleted in the atmosphere.
Answer:
Global temperature of earth will increase
Explanation:
green house gases will trap. the heat and it will make our atmosphere warm.
The increased level of greenhouse gases increases the temperature of the earth considerably. The Global temperatures on Earth will increase as a result of it. The correct option is B.
What is greenhouse effect?The process by which the radiations from the sun are absorbed by the greenhouse gases and not reflected back into the space is defined as the greenhouse effect. This insulates the surface of the earth and prevents it from freezing.
The gases which absorb the infrared radiations and cause greenhouse effect are called the greenhouse gases. Some examples are Carbon dioxide, chlorofluorocarbons, etc.
The phenomenon of gradual increase in the average temperature of the earth's atmosphere due to green house effect is called the global warming. Due to the greenhouse effect the ozone layer of the earth's atmosphere also get depleted.
Thus the correct option is B.
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help me pleaseeeeeeeeeeeeeeeeeeeeeeeeee
Answer: nitrogen
Explanation:
Question 2 (1 point)
N2 + 3H2 --> 2NH3
How many moles of N2 are needed to produce 4.5 moles of NH3?
2.25 moles
3 moles
b
4.5 moles
d
1 mole
Question 3 (1 point)
write accurate defination of atom.
If your answer is 100 % right then I will give you 5 star otherwise you gain 3 star.
Answer:
Atom, smallest unit into which matter can be divided without the release of electrically charged particles. It also is the smallest unit of matter that has the characteristic properties of a chemical element. As such, the atom is the basic building block of chemistry.
Explanation:
Select the correct answer.
Did an oxidation-reduction reaction occur in the reaction between copper sulfate and sodium sulfide?
CuSO4 + Na2S → CuS + Na2SO4
A.
This is a redox reaction because copper gained electrons.
B.
This is a redox reaction because sodium lost electrons.
C.
This is a redox reaction because sulfur gained electrons.
D.
This is not a redox reaction because no electrons were transferred.
E.
This is not a redox reaction because oxygen did not gain electrons.
Answer:
D.
This is not a redox reaction because no electrons were transferred.
Explanation:
Because oxidation state of each element is same in reactants and products.
what is 20+9-10+67=?
Answer:
86
Explanation:
20 plus 9 equals 29 minus 10 equals 19 plus 67 equals 86
Answer:
86
Explanation:
20+9=29
29-10=19
19+67=86
The physical part of digestion is called?
a) digestion
b) mechanical digestion
c) chemical digestion
d) solubility
Answer:
mechanical digestion is the physical part of digestion
Answer:
mechanical digestion
Explanation:
which alkaline earth metal is the components of Epsom salt
Answer:
Epsom salt is magnesium sulfate.
Alkaline earth metal, which is also sold in other products like milk of magnesia and Epsom salt magnesium sulfate and magnesium hydroxide.
What is alkaline earth metal ?The elements that make up group 2 of the current periodic table are the alkaline earth metals. Beryllium, magnesium, calcium, strontium, barium, and radium are among the elements in this group.
The physical and chemical characteristics of the elements in this group are quite similar. However, they are not often encountered in their elemental forms in nature.
Beryllium and radium are the first two elements in the second group of the periodic table, which is made up of the alkaline earth metals. They are all glossy, silvery-white metals with good reactivity, albeit not as good reactivity as the alkali metals.
Thus, alkaline earth metal is the components of Epsom salt are magnesium sulfate and magnesium hydroxide.
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How many grams are they in 2.3 X 10^24 atoms of Ag?
Answer:
[tex]\boxed {\boxed {\sf 411.9833942 \ grams \ of \ silver}}[/tex]
Explanation:
1. Convert Atoms to Moles
To convert atoms to moles, we use Avogadro's Number: 6.022*10²³. This tells us the amount of particles in 1 mole of a substance. In this case, it is atoms of silver.
[tex]\frac {6.022*10^{23} \ atoms \ Ag}{ 1 \ mol \ Ag}[/tex]
Multiply by the given number of atoms.
[tex]2.3 *10^{24} \ atoms \ Ag*\frac {6.022*10^{23} \ atoms \ Ag}{ 1 \ mol \ Ag}[/tex]
Flip the fractions so the atoms of silver cancel.
[tex]2.3 *10^{24} \ atoms \ Ag*\frac {1 \ mol \ Ag}{ 6.022*10^{23} \ atoms \ Ag}[/tex]
[tex]2.3 *10^{24} *\frac {1 \ mol \ Ag}{ 6.022*10^{23}}[/tex]
[tex]\frac {2.3 *10^{24} \ mol \ Ag}{ 6.022*10^{23}} = 3.819329127 \ mol \ Ag[/tex]
2. Convert Moles to Grams
To convert from moles to grams, we use the molar mass. This can be found on the Periodic Table.
Silver (Ag): 107.868 g/molUse this as a fraction.
[tex]\frac { 107.868 \ g \ Ag}{ 1 \ mol \ Ag}[/tex]
Multiply by the number of moles we calculated. The moles of silver will cancel.
[tex]3.819329127 \ mol \ Ag * \frac { 107.868 \ g \ Ag}{ 1 \ mol \ Ag}[/tex]
[tex]3.819329127 \ * \frac { 107.868 \ g \ Ag}{ 1 }[/tex]
[tex]411.9833942 \ g \ Ag[/tex]
Please help meee thank uou!!!
1. How many molecules of water make up 1.00 MOLE?
I need how to solve it please.
Answer:
6.022x10^23
Explanation:
Avogrado's number proved that one mole is equal to 6.022x10^23.
What is the correct chemical formula for Fe2(CO3)3?
A. iron carbonate
B. iron (II) carbonate
C. iron (III) carbonate
D. iron-carbon oxide
The same amount of energy is supplied the same mass of aluminum and lead.Which metal will increase in temperature the most
Answer:
lead
Explanation:
aluminum doesn't conduct heat
Combining hydrogen and oxygen to make water is a physical change
id say physical cause your changing the physical form of the molucles
what are the roles of the mucous select two options PLEASE HELP
Answer:
The answer is A and C
answers this...i gave brainlest!!
Answer:
I hope I can help
Explanation:
I hope I can help you
I need help knowing if chemical formulas are balanced or unbalanced I cease to understand this ;-;
Balancing Chemical Formulas is like simple mathematic systems of equations
Lets look at your second example:
H2 + Cl2 = HCl
Lets replace H with x, and Cl with y.
the equation would now be
2x + 2y = xy (now I know in math x+y does not equal xy, but bear with me)
This would not be correct. For the equation to be true, both sides must yield the same counterpart. To do this, you'd have to add a coefficient to balance out both sides.
Looking at the equation, you know you have to balance the right side, as the left side is adding two things up to getting only half value. So, we will add coefficient of "2" to xy. This means that the balanced chemical equation will now be H2 + Cl2 = 2HCl
How many grams of calcium phosphate does 4.1*10^25 have
Answer:
310.176722 grams
You can view more details on each measurement unit: molecular weight of Calcium Phosphate or grams The molecular formula for Calcium Phosphate is Ca3(PO4)2. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Calcium Phosphate, or 310.176722 grams.
PLEASE CAN SOMEONE PLEASE HELP ME I CAN'T DO IT :(
CaCO3 + H2SO4 __________ + H2O + CO2
Na2CO3 + __________ 2NaCl + H2O + CO2
Answer:
H2SO4 + CaCO3 → CaSO4 + H2O + CO2 - Balanced equation | Chemical Equations online!
Na2co3 HCL nacl h2o co2
This is an acid-base reaction (neutralization): Na 2CO 3 is a base, HCl is an acid. This is a gas evolution reaction, CO 2 is the formed gas.
all atoms in the main group want _____ electrons in their outset shell
The electrophilic aromatic substitution of isopropylbenzene with FeBr3, Br2 gives 1-bromo-4-isopropylbenzene. Complete the curved-arrow mechanism below, beginning with formation of the active brominating reagent. Remember to include lone pairs and formal charges where appropriate.
Answer:
See explanation below
Explanation:
When the bromine (Br₂) reacts in presence of FeBr₃ with the isopropylbenzene, the isopropylbenzene is a ring activator, therefore, it will promote the substitution in the ortho and para positions. However, as the Isopropyl is voluminic, the ortho position would have steric hindrance and hence, this product is not formed in greater proportions. Instead, the para position becomes more available to reaction, and this product is formed in majority.
The mechanism of reaction can be seen in the following picture, along with the products of the reaction
Hope this helps
Consider the reaction below the reactivities of tertiary,secondary and primary hydrogen are 1700: 5:1 respectively. Predict the percentage yield of each of the products.
Answer:
1700: 5:1 124 123 !
Explanation:
Predict the percentage 123!
Rank all the following elements in order of increasing electronegativity:
I, F, Br, At, CI
Answer:
At < I < Br < Cl < F
Explanation:
Electronegativity is defined as the ability of an atom to attract pair of electrons. On the periodic table, electronegativity decreases down the group and increases along the period.
The given atoms belong to the same group, so following the above rule, F has the highest electronegativity than other given atoms as it is at the top of the group and At will have the least electronegativity as it is at the bottom of the group.
Hence, the order of increasing electronegativity is
At < I < Br < Cl < F.
Name an acids and a bases
Answer:
HCl for acid, NaOH for base.
Explanation:
Acids start with H.
Bases end with OH.
Write a detailed diagram about Mountain Vesuvius, labeling important features about it.
Answer:
Explanation:
Mount Vesuvius is considered to be one of the most dangerous volcanoes in the world because of its proximity to the city of Naples and the surrounding towns on the nearby slopes. The volcano is classed as a complex stratovolcano because its eruptions typically involve explosive eruptions as well as pyroclastic flows