Answer:
This one here shows the proper use of parentheses>>>Ca(NO3)2
SnO₂ + 2H₂
+ 2 H2 → Sn + 2 H2O
Is it balanced or unbalanced
Answer:
I'm pretty sure it is unbalanced
The solid obtained at the neck of a funnel in sublimation is called....................?(mixture)
Answer:
Sublimate
Explanation:
The solid obtained at the neck of a funnel in sublimation is called the sublimate.
This substance is a solid.
Sublimation process is a phase change. In this process, a solid is directly changed to gas or gas changed to solid. Heat must be added to change the solid to gas and heat removed for the reverse process. Not all substances have this capability.which statement is true of a rock layer that had another rock layer deposited on top of it?
Answer:
second rock...I know it
Where did the word "atom" come from?
ancient Greece of 400 B.C.there was a brilliant philosopher named Democritus, and he proposed the Greek word atomos, which means uncuttable. And so as he explained, all matter was eventually reducible to discrete, small particles or atomos.
Need Help!!Atomic Structure escape room. Enter 4 digit code(no spaces)
Answer:
9146
Explanation:
The letters are in the place of the number on the clock. A is in the place of 9, B is in the place of 1, and so on. I hope I was correct!
Answer:
9641
Explanation:
how do you think the number of electrons affects an element’s reactivity?
MOST of the elements in the periodic table are
A. liquids at room temperature
B. metals
C. metalloids
D. nonmetals
Answer:
B. metals
Explanation:
Most of the elements in the periodic table are classified as metals. They are usually solid at room temperature.
The first and second block of the periodic table are all metallic elements. Those in the d-block are all metals. Metals generally occupy the s and d -blocks. Non-metals and metalloids are found in the p-blocksWhich statement best explains why an object appears green in sunlight?
A- The object absorbs most white light and refracts most green light.
B- The object refracts most white light and absorbs most green light.
C- More green light is absorbed while more red and blue light is reflected.
D- More green light is reflected while more red and blue light is absorbed.
Answer:
b
Explanation:
Balance the following equation? Al + O2 - - - - - -) Al2O3
Answer:
4Al (s) + 3O₂ (g) → 2Al₂O₃
General Formulas and Concepts:
Chemistry - Reactions
Reaction PredictionBalancing RxN'sExplanation:
Step 1: Define RxN
Al (s) + O₂ (g) → Al₂O₃
Step 2: Balance RxN
4Al (s) + 3O₂ (g) → 2Al₂O₃
Need to balance the amount of oxygens on both sidesIf we balance the oxygens, the aluminums will also have to be rebalanced(Help) when nearly vertical rays of solar energy strike a region of the earth that area has warm temperatures what region of the earth gets nearly vertical rays of solar energy year around?
A) United States
B) Australia
C) North and South Poles
D) Equator
Answer:
D) The equator
Explanation:
To solve this we must be knowing each and every concept related to solar energy. Therefore, the correct option is option D among all the given options.
What is solar energy?Sun energy is the term for solar radiation that may create heat, trigger chemical processes, or create electricity. The total solar energy incidence on Earth is far greater than the global energy needs at the now and in the future.
Although sunlight is unquestionably the most potent energy source that Earth receives from the Sun, its intensity at the surface of the planet is really rather modest. When nearly vertical rays of solar energy strike a region of the earth that area has warm temperatures. Equator is the region of the earth that gets nearly vertical rays of solar energy year around.
Therefore, the correct option is option D.
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How many moles are 7.25 x 1023 formula units of Mgo ?
O A) 1.31 moles
OB) 1.33 moles
OC) 1.42 moles
D) 1.20 moles
O E) 1.27 moles
OF) 1.51 moles
OG) 1.29 moles
Answer:
The answer is option DExplanation:
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{7.25 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{7.25}{6.02} \\ = 1.2043189368...[/tex]
We have the final answer as
1.20 molesHope this helps you
what is copper in chemisry
Answer: Copper in Chemisry is an chemical element, a reddish, extremely ductile metal of Group 11 (Ib) of the periodic table that is an unusually good conductor of electricity and heat. Copper is found in the free metallic state in nature.
Explanation:
How can you separate sand, sugar and gravel
Answer:
Grating
Explanation:
I think you need to grate it
Answer: The sugar would dissolve in water. You could then pour off the solution and wash the remaining sand with a bit more water. Heat the water to evaporate it from the sugar, and the two are separate
Explanation:
A forklift applies a force of 2,000 N to raise a box 3 m.
How much work is done by the forklift in raising the
box?
If the force is applied to lift the box, then there is no work done as the displacement of the box is not in the same direction of the box.
However, if the force is being applied to move the box in the direction of the force, then the work done is:
Work = force x distance
Work = 1500 x 3
Work = 4,500 Joules
A forklift applies a force of 2,000 N to raise a box 3 m. The work is done by the forklift in raising the box is 6000 Joules.
What is force ?A force is an influence that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity, since it has both magnitude and direction.
Isaac Newton's three laws of motion, which are outlined in his Principia Mathematica, are frequently used to illustrate the concept of force (1687).
Contact forces and act at a distance forces are the two different types of forces. Your daily use of force is evident. Basically, push and pull are forces. You exert force on an object when you push against it or pull against it.
The force is applied to move the box in the direction of the force,
Then the work done is
Work = force x distance
Work = 2000 x 3
Work = 6000 Joules.
Thus, A forklift applies a force of 2,000 N to raise a box 3 m. The work is done by the forklift in raising the box is 6000 Joules.
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What must a scientist do in order to develop a testable hypothesis?
O A. Be certain that the data collected will fully support the hypothesis.
B. Find out whether the hypothesis can also explain untestable
claims.
C. Make sure that no other scientist has investigated the topic
before.
O D. Determine whether it is possible to gather the necessary data.
Answer:
A
Explanation:
Be certain that the data collected will fully support the hypothesis
Answer: D. Determine whether it is possible to gather the necessary data.
Which equation shows how to calculate how many grams (g) of KOH would
be needed to fully react with 4 mol Mg(OH)2? The balanced reaction is:
MgCl2 + 2KOH → Mg(OH)2 + 2KCI
Answer:
A.
General Formulas and Concepts:
Chemistry - Stoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
Given: 4 mol Mg(OH)₂
RxN: MgCl₂ + 2KOH → Mg(OH)₂ + 2KCl
Step 2: Identify Conversions
Molar Mass of K - 39.10 g/mol
Molar mass of O - 16.00 g/mol
Molar mass of H - 1.01 g/mol
Molar Mass of KOH - 39.10 + 16.00 + 1.01 = 56.11 g/mol
Step 3: Stoichiometry
[tex]4 \ mol \ Mg(OH)_2(\frac{2 \ mol \ KOH}{1 \ mol \ Mg(OH)_2} )(\frac{56.11 \ g \ KOH}{1 \ mol \ KOH} )[/tex]
Answer:
check the attachment/picture below!
Explanation:
I had just taken that quiz! :D
Describe the relationship between the solubility rate of a gas and temperature.
25 points
Answer:
as temperature increases, solubility of gas decrease
What percentage of the atmosphere is oxygen?
Answer:
21%
Explanation:
It's a mixture of different gases. The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen.
When a student dissolves 2.50 g of LiCl in 100.0 mL of water (100.0 g) the temperature rises from 24.0 oC to 29.11oC. What is ∆H in KJ/mol for the dissolution of LiCl in water? Make sure you include the correct sign for ∆H and units (with a space between number and unit)
Answer:
[tex]36.273\ \text{kJ/mol}[/tex]
Explanation:
m = Mass of LiCl = 2.5 g
M = Molar mass of LiCl = 42.394 g/mol
c = Specific heat of water = [tex]4.186\ \text{J/g}^{\circ}\text{C}[/tex]
[tex]\Delta T[/tex] = Change in temperature = [tex]29.11-24=5.11\ ^{\circ}\text{C}[/tex]
[tex]m_w[/tex] = Mass of water = [tex]\rho V=1\times 100=100\ \text{g}[/tex]
Number of moles
[tex]n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{2.5}{42.394}\\\Rightarrow n=0.05897\ \text{mol}[/tex]
Heat is given by
[tex]Q=m_wc\Delta T\\\Rightarrow Q=100\times 4.186\times 5.11\\\Rightarrow Q=2139.046\ \text{J}[/tex]
Enthalpy is given by
[tex]\Delta H=\dfrac{Q}{n}\\\Rightarrow \Delta H=\dfrac{2139.046}{0.05897}\\\Rightarrow \Delta H=36273.46\ \text{J/mol}=36.273\ \text{kJ/mol}[/tex]
The enthalpy for the dissolution is [tex]36.273\ \text{kJ/mol}[/tex].
In an atom, the number of neutrons is generally equal to or greater than the number of protons because....
Answer:
because the neutrons is always equal or greater there is never a less then in neutrons.
Explanation:hope this helped
In the reaction C + 02 - CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction? O 18 g O 54 g O 72 g 0 90 g
Mass of oxygen : 54 g
Further explanationConservation of mass applies to a closed system, where the masses before and after the reaction are the same
Reaction
[tex]\tt C+O_2\rightarrow CO_2[/tex]
mass before reaction = mass after reaction
mass C + mass O₂= mass CO₂
[tex]\tt 18~g+mass~O_2=72~g\\\\mass~O_2=72-18=\boxed{\bold{54~g}}[/tex]
Write a paragraph explaining what would happen if liquids A,B 3,C, and D were added to the graduated cylinder. Describe how the layers of the density column would be arranged (the order they would be in). Finally, predict where an object with a density of 1.07 g/cm^ 3 would stop in the column. Justify your reasoning with quantitative data (your density calculations).
i dont understand this i cant think :These ions have the same stable electron configuration as the noble gas helium. All Group 1 atoms can lose one electron to form positively charged ions. ... Elements in Groups 15,16 and 17, find it easier to gain electrons than lose them.
Answer:
Li atoms readily give up one electron to form positively charged, Li+ ions. These ions have the same stable electron configuration as the noble gas helium. All Group 1 atoms can lose one electron to form positively charged ions.
Explanation:
I DON'T KNOW IF THIS IS THE RIGHT ANSWER BUT I'M TRYING TO JUST ANSWER.
Answer:
Explanation:
-We know that an atom is table if they have 8 valence electrons (like noble gases, they are stable)
-Group 1 atoms only has 1 valence electron, in order to become stable, they are desperately wanted to lose that one valence electron to become stable.
-While group 15 has 5 electrons, it is easier for them to gain 3 electrons to become 8 electrons than losing all 5 electrons.
-the same thing for group 16 has 6 valence electrons and 17 has 7 electrons. It is easier for them to gain 2 and 1 more valence electrons to become stable.
Hope this helps!
WILL GIVE BRAINLIEST
Answer:
1 Mole
Explanation:
1 mole is equal to 1 moles NH4, or 18.03846 grams.
Is science btw HELP Question 1 What is the significance of a standard system of measurement?
A: Scientists from around the world need a way to share data they can all understand.
B: Every Country has its own set of measurement standards.
C: Scientists come from different cultural backgrounds.
D: The language spoken in different countries are different.
Question 2 Which of the following is the SI unit used by chemists to measure the amount of an element or substance?
A: Millimeter
B: Molecule
C: Atom
D: Mole
Question 3 Which is a measurement of distance that is used around the world?
A: 24 feet
B: 30 miles
C: 500 meters
D: 16 kilograms
Question 4 A centimeter is __________ meter(s)
A: 1,000
B: 100
C: 1/100th
D: 1/1000th
Question 5 Which of the following is equivalent to 140 centiliters
A: 14.0 milliliters
B: 1.4 deciliters
C: 0.00140 kiloliters
D: 0.140 liters
Answer:
b
Explanation:
What is the molar mass of CHCl3?
48.47 g/mol
83.92 g/mol
119.37 g/mol
121.39 g/mol
119.37 g/mol
Further explanationRelative atomic mass (Ar) and relative molecular mass / molar mass (M)
the molar mass/molecular mass of a compound : the sum of the relative atomic mass (Ar) of the constituent atoms
M AxBy = (x.Ar A + y. Ar B)
Atomic weight (Ar) of :
C : 12.0107 g/mol H : 1.00784 g/mol Cl : 35.453 g/molThe molar mass of CHCl₃
[tex]\tt CHCl_3=12.0107+1,00784+(35,453\times 3)=119.37~g/mol[/tex]
The molar mass of [tex]CHCl_3[/tex] (chloroform) is 119.37 g/mol. Therefore, the correct option is C.
The organic compound chloroform, which has the molecular formula [tex]CHCl_3[/tex], is well known for its use as a solvent and anaesthetic. It consists of three chlorine atoms (Cl), one hydrogen atom (H), and one carbon atom (C).
The molar mass of carbon (C) is approximately 12.01 g/mol, the molar mass of hydrogen (H) is approximately 1.01 g/mol, and the molar mass of chlorine (Cl) is approximately 35.45 g/mol. We add up the molar masses of all the individual atoms to determine the molar mass of [tex]CHCl_3[/tex]:
(1 * molar mass of C) + (1 * molar mass of H) + (3 * molar mass of Cl)
(1 * 12.01 g/mol) + (1 * 1.01 g/mol) + (3 * 35.45 g/mol)
12.01 g/mol + 1.01 g/mol + 106.35 g/mol
The molar mass of [tex]CHCl_3[/tex] is approximately 119.37 g/mol.
Therefore, the correct answer is C.
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i need help with scientific notation. this is the decimal notation form help.
Answer:
1.23345*10^11
5.768*10^(-5)
3.456*10^(-2)
2.28*10^9
8.0970*10^4
Explanation:
You just need to count the number of zeros and move the values backward and forward to get the scientific notation.
How are monosaccharides and polysaccharides structurally different? *NO PLAGIARISM PLS*
Explanation:
Monosaccharides are simple carbohydrates that cannot be further hydrolyzed to simpler carbohydrates. They contain between three and six carbon atoms per molecule.
Polysaccharides are complex carbohydrates . They are condensation polymers derived from very long chains of monosaccharide units.
Structurally, polysaccharides are made up of repeating units of monosaccharides.
will mark BRAINLIEST!!
Explanation:
i think it is a polar bond but I am not sure
Answer:
i believe it forms a covalent bind by sharing the electrons, so closest would be Ionic
Aluminium is produced by electrolysis of a molten mixture.
What two substances does the molten mixture contain??
Answer:
cryolite and oxide
Explanation:
The molten mixture contain what is referred to as cryolite and aluminium oxide in electrolytic production of aluminium.
What is an Electrolyte?This is a chemical substance which when dissolved in water conducts electricity.
The aluminium oxide and cryolite mixture are involved in the production of aluminium with carbon dioxide being given off.
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