Answer:
19
Explanation:
Here,
[Ar] = Argon = atomic no. = 18
4s1 = 1 electron
so 18 + 1 = 19
19 = Potassium (K)
What is the charge for molybdenum?
A student decides to use the technique employed in Part B of this lab to determine the density of vodka. He first fills a buret with vodka to an initial volume of 1.52 mL. He then drains out some of the vodka into an empty beaker with a mass of 13.687 g. The final buret volume is 9.62 mL. If the combined mass of the beaker and vodka is 21.123 g, what is the the density of the vodka
Answer:
Explanation:
Volume of vodka = 9.62 - 1.52 = 8.10 mL drained into beaker .
Mass of vodka drained out = 21.123 - 13.687 = 7.436 g
density of vodka = mass / volume
= 7.436 / 8.10 g / mL .
.918 g / mL .
how many particles would be found in a 2.1 mol sample of AlPO4?
1.3 × 10²⁴ particles AlPO₄
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
2.1 mol AlPO₄
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 2.1 \ mol \ AlPO_4(\frac{6.022 \cdot 10^{23} \ particles \ AlPO_4}{1 \ mol \ AlPO_4})[/tex]Multiply/Divide: [tex]\displaystyle 1.26462 \cdot 10^{24} \ particles \ AlPO_4[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
1.26462 × 10²⁴ particles AlPO₄ ≈ 1.3 × 10²⁴ particles AlPO₄
B. Each atom is neutrally charged, which means that each atom has the same number of protons and
electrons. Based on this, how many protons are in each atom?
Sodium
Chlorine
True or false: elements are atoms or molecules that have a net charge
Answer:
true
Explanation:
How many different elements are combined in sulfur dioxide
Answer: 2elements sulfur and oxygen
Read the descriptions below of two substances and an experiment on each. Decide whether the result of the experiment tells you the substance is a pure substance or a mixture, if you can.
• Sample A is a solid yellow cube with a total mass of 50.0 g. The cube is ground to a fine orange powder and added to a 500 ml beaker full of water. The beaker is stirred vigorously. Some of orange powder settles to the bottom of the beaker, and some rises to the top and floats on the water. When the powder at both the bottom and the top of the beaker is filtered out, dried, and weighed, the total mass is measured to be 50.1 g.
• Sample B is 100 mL of a clear liquid. The density of the liquid is measured, and turns out to be 0.77 g/mL. The liquid is then heated in a flask until it boils. The vapor that rises off the bolling liquid is collected for 10 minutes and cooled until it condenses into a separate beaker. The density of the liquid that remains in the flask is then measured, and turns out to be 1.04 g/mL.
Required:
Is sample A made from a pure substance or a mixture?
Answer:
Sample A is a mixture
Sample B is a mixture
Explanation:
If we look at sample A, we can easily notice that the sample powder was found to float while some of it settled below. This means that the sample is not entirely homogeneous. A homogeneous sample always constitutes a single phase in solution. Also, the dried mass yields 50.1 g while only 50.0 g of the yellow cube was ground and dissolved. This shows that the original cube is not pure. A sample that is not entirely homogeneous is not pure.
Secondly, the fact that the density of liquid that remains in the flask is different from the density of the sample initially measured indicates that the original sample B is a mixture of substances.
Gaseous ammonia chemically reacts with oxygen O2 gas to produce nitrogen monoxide gas and water vapor. Calculate the moles of ammonia needed to produce 1.70 mol of nitrogen monoxide. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits.
Answer:
1.7 moles of ammonia, NH₃.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
4NH₃ + 5O₂ —> 4NO + 6H₂O
From the balanced equation above,
4 moles of NH₃ reacted to produce 4 moles of NO.
Finally, we shall determine the number of mole of ammonia, NH₃, needed to produce 1.7 moles of nitrogen monoxide, NO. This can be obtained as follow:
From the balanced equation above,
4 moles of NH₃ reacted to produce 4 moles of NO.
Therefore, 1.7 moles of NH₃ will also react to produce 1.7 moles of NO.
Thus, 1.7 moles of ammonia, NH₃, is required.
Why are there few fossils of protists. write a paragraph response
Answer:
protists that produce a hard outer covering have left many fossils, other protists lack hard parts, so few fossils of these organisms have been found. ... Protists in this group are called plantlike because, like plants, they contain the pigment chlorophyll in chloroplasts and can make their own food.
Explanation:
Hope it helps, some how.
four difference between electrolytic cell and electrochemical cell
Answer:
Electrochemical cells convert chemical energy into electrical energy or vice versa. Electrolytic cell is a type of electrochemical cell in which electrical energy is converted into chemical energy. ... Electrolytic cells consist of positively charged anode and a negatively charged cathode.
I hope it's help
How many molecules are present in 5.45 moles of NO? Use the space below to show your work.
Answer:
Explanation below:)
Explanation:
5.45 mol NO(6.022*10^23 molecules/mol) = 3.18 *10^24 molecules NO
Good Luck!! :)
Answer:
3.18*10^24 molecules
Explanation:
Since 1 mole of any substance consists of 6.022 × 10²³ molecules, simply do
[tex]\frac{5.45 Moles}{1}*\frac{6.022*10^23 molecules}{1 mole}[/tex]=3.18199*10^24 molecules.
However, remember to include sig figs (3) and round it to 3.18*10^24 molecules
Hope this helps :)
Is acid rain a global or a regional concern ?
Explanation:
Acid rain is linked to both natural and man-made sources. Nitrogen oxides are formed through the extreme heating of air when a thunderstorm produces lightning. ... For this reason, acid rain is considered a global problem
Answer:
Acid rain is a global concern.
Explanation:
The effects of acid rain have reached dramatically mainly in the industrialized countries which fall on global ecology.
Wedges and dashes are used to indicate the ____________ shape in a drawn structure. A wedge indicates that the atom or group is _________ of the page and a dash indicates that the atom or group is going into the page .
Answer:
Wedges and dashes are used to indicate the three dimensional shape in a drawn structure.
A wedge indicates that the atom or group is GOING OUT of the page.
Explanation:
wedges and dashes are ways or drawings use to represent three dimensional shape in a structure. Lines are use to represent image in the structure. A wedge line shows that molecules or bonds are moving towards the viewer i.e out of the the page.
A dashes line shows that bonds or atom are moving away the viewer or going into the group.
Which statement correctly describes protons?
A. They have no charge and are present in the nucleus of an atom.
B. They have a negative charge and travel around the nucleus of an atom.
C. They have a positive charge and travel around the nucleus of an atom.
D. They have a positive charge and are present in the nucleus of an atom along with the neutrons.
Answer:
d
Explanation:
it's basic chemistry. electrons are negative and travel around the outside. neutrons are neutral and in the nucleus with the proton
Typically, water runs through the baseboard copper tubing and, therefore, fresh hot water is constantly running through the piping. However, consider a pipe where water was allowed to sit in the pipe. The hot water cools as it sits in the pipe. What is the temprature change, (ΔT), of the water if 194.0 g of water sat in the copper pipe from part A, releasing 1238 J of energy to the pipe? The specific heat of water is 4.184 (J/g)⋅∘C.
Answer:
[tex]\Delta T=1.53\°C[/tex]
Explanation:
Hello!
In this case, since the problem is providing mass, energy, and specific heat of water, we can write the following equation that relates them to each other:
[tex]Q=mC\Delta T[/tex]
In such a way, we get rid of both m and C, to solve for the change in temperature:
[tex]\Delta T=\frac{Q}{mC}[/tex]
Now we plug in the data to obtain:
[tex]\Delta T=\frac{1238J}{194.0g*4.184\frac{J}{g\°C} }\\\\\Delta T=1.53\°C[/tex]
Best regards!
what is metal and non metal with differenties
Answer:
i have no clue
Explanation:
i have no clue
Answer:
hope it helps...
Explanation:
Elements can be divided into metals and nonmetals and it is important to know whether a particular element is a metal or nonmetal. Metals (like copper and aluminium) are good conductors of heat and electricity, while nonmetals (such as phosphorus and sulfur) are insulators.
What controls flowering in many
plants?
Answer:
All flowering is regulated by the integration of environmental cues into an internal sequence of processes. These processes regulate the ability of plant organs to produce and respond to an array of signals. The numerous regulatory switches permit precise control over the time of flowering.
Explanation:
Why is this a redox reaction?
ron (II) hydroxide, Fe(OH)2, is very insoluble in water. Hence, if it is produced during an aqueous reaction it will precipitate from solution. How many grams of sodium hydroxide (a strong base) must be added to 42.7 mL of a 0.305 M aqueous solution of iron (II) nitrate, in order to precipitate all of the iron as Fe(OH)2
Answer:
1.04g of NaOH must be added to precipitate all of the iron
Explanation:
Based on the chemical reaction:
Fe(NO₃)₂(aq) + 2NaOH(aq) → Fe(OH)₂(s) + 2NaNO₃(aq)
Where 1 mole of Iron (II) nitrate reacts with 2 moles of NaOH to produce 1 mole of Fe(OH)₂
To solve this question we need to find the moles of Fe(NO₃)₂ and using the chemical reaction we can find the moles of NaOH and its mass:
Moles Fe(NO₃)₂:
0.0427L * (0.305mol / L) = 0.0130moles of Fe(NO₃)₂
Moles NaOH
0.0130moles of Fe(NO₃)₂ * (2mol NaOH / 1mol Fe(NO₃)₂) =
0.0260 moles NaOH
Mass -Molar mass NaOH = 40g/mol-:
0.0260 moles NaOH * (40g / mol) =
1.04g of NaOH must be added to precipitate all of the ironWhich chemical equation is unbalanced?
A). C+O,, CO,
B). Sr t+ O2 2SFO
C). 6H, + 30, 6H,O
D). H, +H, +O,-→ H,0 + H,O
Answer:
The options in this question are unclear, the clear options are as follows:
A. C + O2 → CO2
B. Sr + O2 → 2SrO
C. 6H2 + 3O2 → 6H2O
D. H2 + H2 + O2 → H2O + H2O
The answer is B
Explanation:
A balanced chemical equation is that equation in which atoms of each elements in the reaction are of equal number on both sides of the equation (product and reactant). To balance a chemical equation, coefficients are used.
In this question, four chemical equations are given as follows:
- C + O2 → CO2
In this equation, atoms of carbon (1) and oxygen (2) are the same on both sides, hence, it is BALANCED.
- Sr + O2 → 2SrO
In this equation, Sr has 1 atom on the reactant side but 2 atoms on the product side. Hence, it is UNBALANCED. The balanced equation will be: 2Sr + O2 → 2SrO
- 6H2 + 3O2 → 6H2O
In this equation, atoms of hydrogen (12) and oxygen (6) are the same on both sides, hence, it is BALANCED.
- H2 + H2 + O2 → H2O + H2O
In this equation, atoms of hydrogen (4) and oxygen (2) are the same on both sides, hence, it is BALANCED.
Most chemicals can be cleaned up with a general spill kit, but a few chemicals require specialized spill procedures. For each substance listed, determine whether a general spill kit is sufficient or if a specialized spill kit is needed.
a. hydrofluoric acid
b. special mercury
c. special phosphoric acid
d. acetone
e. general methanol
Answer:
a. hydrofluoric acid - Specialized spill kit is needed
b. special mercury - Specialized spill kit is needed
c. special phosphoric acid - General spill kit is Sufficient
d. acetone - General spill kit is Sufficient
e. general methanol - General spill kit is Sufficient
Explanation:
a. hydrofluoric acid -
It is a weak acid , and very corrosive therefore , it need Specialized spill kit
b. special mercury -
At the room temperature , liquid mercury evaporates. But Small amount of mercury can cause harm so , Specialized spill kit is needed
c. special phosphoric acid -
It is relatively compared to others is a week acid , therefore General spill kit is Sufficient
d. acetone -
At the room temperature , acetone evaporates, therefore General spill kit is Sufficient
e. general methanol -
At the room temperature , methanol evaporates, therefore General spill kit is Sufficient
The kind of spill kit required for the cleanup of chemicals is determined by the nature of the chemical.
The kind oft required for the cleanup of chemicals is determined by the nature of the chemical. If a chemical is highly corrosive or toxic, it follows that a special spill kit is required to clean up a spill of the chemicals in order to ensure minimum damage. The spill kit required for each chemical is shown below;
Hydrofluoric acid - Specialized spill kit is neededSpecial mercury - Specialized spill kit is neededSpecial phosphoric acid - General spill kit is SufficientAcetone - General spill kit is SufficientGeneral methanol - General spill kit is SufficientLearn more about spill kit: https://brainly.com/question/4915023
Record observations of the reaction and
products in the data table.
The brown solid that formed is
Answer:copper
Explanation:edg 2021 ;)
Answer: B.) Copper
Explanation:
HELP BRAINLIEST
Question 9
1 pts
In chemistry, angstrom (A) is a commonly used unit, and 1 Á = 10-10 m.
Another commonly used unit is nanometer (nm), and 1 nm = 10-9 m. The
relation between Å and nm is
1 Á = 10-19 nm
1 Á = 10 nm
1 A = 1019 nm
1 A = 0.1 nm
ELP BRAINLIEST
Answer:
1A = 0.1 nm
Explanation:
4. Both vitamins and minerals are called protective foods. (True/False)
Answer:
true
Explanation:
hope this answer helps :)
Answer:
true
Explanation
vitamins and minerals are protective foods
A mixture of helium and neon gas is expanded from a volume of 47.0 L to a volume of 93.0 L, while the pressure is heid constant at 97.0 atm. Calculate the work done on the gas mixture.
Answer:
W = - 452.112 kJ
Explanation:
given data
initial volume v1 = 47 L
final volume v2 = 93 L
external pressure = 97 atm
solution
we get here work done that is express as
W = - P (V2 - V1) .......................1
put here value and we get
as V2 - V1 = 93 L - 47 L = 46 L
1 atm = 101325 pascal
41 atm = 9828525 pascal
46 L = 0.046 m³
W = - 9828525 pascal × 0.046 m³ = 452112.15 J ( 1KJ = 1000 J )
so
W = - 452.112 kJ
The chemical formula of bromomethane is BrCH3. Which correctly describes the number of atoms of each element in bromomethane?
The number of atoms of each element :
C : 1 atom
H : 3 atoms
Br = 1 atom
Further explanationGiven
Bromomethane-CH₃Br
Required
The number of atoms
Solution
The empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
The number of atoms in a compound is generally indicated as a subscript after the atom
C : 1 atom
H : 3 atoms
Br = 1 atom
Total 5 atoms
Consider the following data:
HfCo2 = -393.5 kj/mol
HfH20 = -241.82 kj/mol
Hfc2h6 = -84.68 kj/mol
Using these data, calculate Delta HRXN
for this chemical reaction. Round to the nearest whole number.
2C2H6(g) + 7O2(g) -> 4CO2(g) + 6H2O(g)
Answer:
if you ask yahoo answers it will tell you
Explanation:
hope i helped
Answer:
-2856
-792
endothermic, exothermix, exothermic, endothermic
no
Explanation:
Please help me ASAP I’ll mark Brainly
Answer:
Electrical, heat, and light
Explanation:
help please, please,please. ....
Answer:
the answer is nitrogen
Explanation:
u can right this for explain your answer-
( nitrogen is unreactive
nitrogen doesn't support burning )
orrrrr
(contains no oxygen
all the other jars contain oxygen)
balance the chemical reaction ___ Al + ___ FeO → ___ Al2O3 + ___ Fe
Answer:
2Al+3FeO→Al2O3+3Fe
Explanation:
Basically, to get this answer, you need to balance the amount of Aluminum to the ammount on the other side which is 2 so you need 2 Al to balance the reaction correct, next you move on to the amount of Oxygen in the reaction, there are three Oxygen’s on the right and one on the left, so you need 3 FeO in order for the Oxygens to be balanced. Now that the Iron is unbalanced on both sides, you need 3 Fe (on the right) in order for the equation to be balanced.
The balanced chemical reaction is [tex]2Al+3FeO[/tex] → [tex]Al_2O_3+3Fe[/tex]
What is a balanced chemical reaction?A balanced chemical equation occurs when the number of atoms involved on the reactants side is equal to the number of atoms on the products side.
To balance a reaction means to make the number of atoms the same on both the reactants and products sides. To do so, coefficients need to be added to the chemical equation.
Hence, the balanced the chemical reaction is [tex]2Al+3FeO[/tex] → [tex]Al_2O_3+3Fe[/tex].
Learn more about the balanced chemical reaction here:
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