Answer:
alkali metals: 1 valence electron, very reactive metals
alkaline earth metals: 2 valence electrons, reactive metals
halogens: 7 valence electrons, very reactive nonmetals
noble gases: 8 valence electrons, very little reactivity
Explanation:
The groups increase by 1 valence electron as you move from left to right across the periodic table, skipping over the transition metals. The closer an element is to having a full octet of 8 valence electrons, the more reactive it will be. The alkali metals and halogens are both just 1 away from an octet -- alkali lose an electron, halogens gain one. This makes them very reactive.
A simple circuit with a battery connected to a buzzer by electrical wires is placed on a table. When the buzzer sounds, the table begins to ratte. Which form of energy makes the table rattle?
chemical
ОО
electrical
heat
mechanical
Answer:
Mechanical
Explanation:
mechanical energy:
energy that an object has
because of its motion or
position
B. Add 3 mL of copper (II) sulfate (CuSO.) solution to a test tube. Drop a cleaned zinc strip into the solution. Permit the strip to remain in the solution for 10 minutes. If possible, leave the strip in the solution over night. Note any substance deposited on the zinc strip and any change in the color of the solution. Record your results.
represents the covalent bond by dashes and shows the arrangement of covalently bonded atoms _____.
Answer:
13
Explanation:
ROUND ALL TO 2 DECIMAL PLACES
Question 4
What is the molarity of the following solution?
1.71 mol in 5.15 L of solution
Question 5
How many moles of solute are contained in the following solution?
126mL of 4.03 M CaCl2
Question 6
How many grams of solute are contained in the following?
102.7 ML of 7.99 M KOH
Answer:
Explanation:
4) What is the molarity of the following solution?
Number of moles = 1.71 mol
Volume of solution = 5.15 L
Molarity of solution = ?
Solution:
Molarity = number of moles / volume in L
Molarity = 1.71 mol / 5.15 L
Molarity = 0.33 M
5) How many moles of solute are contained in the following solution?
Volume of solution = 126mL = 126 mL× 1 L /1000 mL = 0.126 L
Molarity of solution = 4.03 M
Number of moles of CaCl2 = ?
Solution:
M = number of moles / volume in L
4.03 M = number of moles / 0.126 L
Number of moles = 4.03 M × 0.126 L ( M = mol / L)
Number of moles = 0.508 mol
6) How many grams of solute are contained in the following?
Volume of solution = 102.7 mL (102.7 mL× 1 L /1000 mL = 0.1027 L)
Molarity = 7.99 M
Mass of solute (KOH) = ?
Solution:
M = number of moles / volume in L
7.99 M = number of moles / 0.1027 L
Number of moles = 7.99 M × 0.1027 L
Number of moles = 0.82 mol
Mass of KOH:
Mass = number of moles × molar mass
Mass = 0.82 mol × 56.1 g/mol
Mass = 46.00 g
Select one family from the periodic table: Groups 1A – 8A. Describe in depth the physical and chemical properties the members of this family share. Properties to consider including - electron configuration, reactivity, melting/boiling points, solubility, reactivity to other atoms, electronegativity, bonding trends, ionization trends, atonic size trends, etc.
Answer:
See explanation
Explanation:
The elements in group 1A are soft metals that are highly electro positive. They are univalent and have the general outermost electron configuration of ns1.
They tarnish upon exposure to the atmosphere and most of them catch fire when they are dropped in water.
They form basic oxides which react with acids to form salt and water. Their trioxonitarate (V) decomposes with difficulty to yield dioxonitrate III and oxygen.
The ease of formation of univalent positive ions increases down the group. The atomic and ionic sizes also increases down the group.
The melting and boiling points of group 1 elements decrease down the group. They most form ionic compounds of high melting and boiling points.
Crystal needs more protein in her diet. Which food sources will best provide the building blocks she needs?
different energy sources can be used to generate electricity which of the following use a renewable energy resource to generate electricity
Answer:
Ths is question uncompleted!
Determine the [OH-] concentration of a 0.123 M Sr(OH)2 solution at 25°C
Answer:
0.246M
Explanation:
0.123M x 2 = 0.246M
Due to Sr(OH)2 has the coefficient of 2.
The [OH⁻] concentration for 0.123 M Sr(OH)₂ solution at 25°C is 0.246M
What is Concentration ?The amount of a solution's solute to either the solvent or the entire solution is called Concentration.
The most common way to express concentration is in terms of mass per unit volume.
The solute concentration, on the other hand, can be expressed in moles or units of volume.
We assume
Sr(OH)2 is a strong base, such that
Sr(OH)₂(s) + H₂O(l) −−−→Sr²⁺(aq)+2OH⁻aq)
The [OH⁻] concentration for 0.123 M Sr(OH)₂ solution at 25°C
= 2 * 0.123
= 0.246 M
As two [OH⁻] are being produced by Sr(OH)₂ .
The [OH⁻] concentration for 0.123 M Sr(OH)₂ solution at 25°C is 0.246M.
To know more about Concentration
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How many molecules of Carbon
Dioxide (CO2) are there in 2 CO2?
There are 2 molecules of Carbon dioxide(CO2)
Further explanationGiven
Molecules of CO2
Required
The number of molecules
Solution
The coefficient of a molecule shows the number of that molecule, while the subscript after the name of the atom indicates the number of that atom in the molecule
Because there is a coefficient of 2 in front of the CO2 molecule, then the number of CO2 molecules is 2
In a reaction process a company expected to make 6.8
tonnes of ammonia but the yield of ammonia was
only 4.2 tonnes. Calculate the percentage yield of
ammonia.
1
61.8 %
2
0.6 %
3
16.2%
4
6.2 %
Answer:
1) 61.8%
Explanation:
(4.2/6.8)*100
During the daytime, wind blows off of the __________________ because that material takes ___________ time to get warm, creating relatively high pressure over it.
a. land, more
b. land, less
c. sea, more
d. sea, less
whoever gets this right gets brainlest
Answer: sea, more
I hope this helps
How many kPa are in 924.8 torr?
Answer:
0.9248kPa
Explanation:
We are to convert from torr to kPa;
To solve this problem, more appropriately the conversion process is from:
torr to Pa and then kPa
These are units of pressure;
1 torr = 1Pa
So;
924.8torr is the same as 924.8Pa
1000Pa = 1kPa
924.8Pa = [tex]\frac{924.8}{1000}[/tex] = 0.9248kPa
Where did the zebra mussels originally come from?
Answer:
he ocean
Explanation:
They are sea cretures who origanly lived in water (or near i forgot)
which gas is produced when limestone react with hydrochloric acid
Answer:
gas X
Explanation:
HELP help HELP!!!! Me ME me
Identify the balanced combination equation.
Cl205 + H2O → 2HCIO3
2Fe(OH)3 - Fe2O3 + 3H20
C1205 + 3H20 HCIO3
2Fe(OH)3 — 2FeO3 + 3H20
Cl₂0₅ + H₂O → 2HCIO₃
2Fe(OH)₃ → Fe₂O₃ + 3H₂O
Further explanationGiven
Chemical equations
Required
The balanced combination equation
Solution
There are several types of reactions that can occur
Synthesis/combination : 2 elements combine to form a single product
A + B⇒AB
Decomposition: One compound breaks down into 2 components
AB⇒A + B
Decomposition is the reverse of syntesis reaction
A balanced equation shows that the number of atoms from the reactant and product sides is the same
The chemical equations that fulfill the two things above (combined and balanced reactions) are:
Cl₂0₅ + H₂O → 2HCIO₃
2Fe(OH)₃ → Fe₂O₃ + 3H₂O
Answer:
Cl2O5 + 3H2O ⟶ HClO3 is the correct answer
Explanation:
Balance the following chemical reaction: _NaOH + _H2SO4 ----->_Na2SO4 +_H20
Already balanced.
NaOH + 2H2SO4 ----> 2 Na2SO4 + H2O
2 NaOH + H2SO4 ----> Na2SO4 + 2H2O
2 NaOH + 2 H2S04 -----> 2 Na2SO4 + 2 H20
Answer:
Sodium Hydroxide + Sulfuric Acid = Sodium Sulfate + Water
2NaOH + H2SO4 → Na2SO4 + 2H2O
Explanation:
To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. The balanced equation will appear above.
Use uppercase for the first character in the element and lowercase for the second character. Examples: Fe, Au, Co, Br, C, O, N, F.
Ionic charges are not yet supported and will be ignored.
Replace immutable groups in compounds to avoid ambiguity. For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will.
Compound states [like (s) (aq) or (g)] are not required.
You can use parenthesis () or brackets [].
Which force is equal but opposite to the one shown?
Answer:B
Explanation:
Given 10.72 mole of NH3 gas, calculate the volume in L at STP
240.1 L NH₃
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
STP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 10.72 mol NH₃ (g)
Step 2: Identify Conversions
[STP] 22.4 L/mol
Step 3: Convert
Set up: [tex]\displaystyle 10.72 \ mol \ NH_3(\frac{22.4 \ L \ NH_3}{1 \ mol \ NH_3})[/tex]Multiply/Divide: [tex]\displaystyle 240.128 \ L \ NH_3[/tex]Step 4: Check
Follow sig fig rules and round. We are given 4 sig figs.
240.128 L NH₃ ≈ 240.1 L NH₃
Tons
Problems
If a -1 ion has 10 electrons, what element is it?
Answer:
sodium ion
Explanation:
And, so if we gots a representation of Na+ , or Cl− , we know that for the sodium ion, while there are 11 charged nuclear particles (how do we know this?), there are 10 charged extranuclear particles, 10 electrons.
brainliest pls
When a substance changes from solid to liquid form, the bonds between the particles become
stronger.
True
False
Answer:True
Explanation:
Answer:
False
Explanation:
Its false, the bonds become weaker.
The basis of life on earth is the photosynthesis reaction. Balance the reaction:
_H,O + _CO_-_CH, , + _0,
O 6, 6, 1, 6
O 1, 1, 1, 1
O None of the above
O 6, 12, 1.6
Answer:
the answer is none of the above
How much energy is required to heat up a Styrofoam cup from 25oC to 40oC? The mass of the cup is 20 grams and the specific heat capacity of Styrofoam is 1.1 J/(g *oC). Group of answer choices
Answer:
[tex]Q=330J[/tex]
Explanation:
Hello!
In this case, since the energy involved during a heating process is calculated as shown below:
[tex]Q=mC(T_2-T_1)[/tex]
Whereas we consider the mass, heat capacity and temperature; we are able to plug in the given data to obtain:
[tex]Q = 20g*1.1\frac{J}{g\°C}(40\°C-25\°C)\\\\Q = 330J[/tex]
Best regards!
A container was found in the home of the victim that contained 124 g of ethylene glycol in 420 g of liquid. What was the percentage of ethylene glycol?
Answer:
29.5%
Explanation:
Step 1: Given data
Mass of ethylene glycol (solute): 124 gMass of liquid (solution): 420 gStep 2: Calculate the mass percentage of ethylene glycol in the liquid
We will use the following expression.
%m/m = mass of ethylene glycol/ mass of solution × 100%
%m/m = 124 g/420 g × 100% = 29.5%
The mass percentage of ethylene glycol in the liquid is 29.5%.
how many grams are in 5.12 moles of Al
Answer:
138.14547456
Explanation:
How many moles Aluminium in 1 grams? The answer is 0.037062379468509.
We assume you are converting between moles Aluminium and gram.
You can view more details on each measurement unit:
molecular weight of Aluminium or grams
The molecular formula for Aluminium is Al.
The SI base unit for amount of substance is the mole.
1 mole is equal to 1 moles Aluminium, or 26.981538 grams.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between moles Aluminium and gram.
Answer:
[tex]\boxed {\boxed {\sf About \ 138 \ grams \ of \ aluminum}}[/tex]
Explanation:
To convert from moles to grams, we must use molar mass.
This can be found on the Periodic Table, so look for the symbol for aluminum: Al
Al: 26.981538 g/molWe can use this number as a ratio.
[tex]\frac { 26.981538 \ g \ Al} { 1 \ mol \ Al}[/tex]
Multiply by the given number of moles: 5.12
[tex]5.12 \ mol \ Al *\frac { 26.981538 \ g \ Al} { 1 \ mol \ Al}[/tex]
Multiply. The moles of aluminum will cancel.
[tex]5.12*\frac { 26.981538 \ g \ Al} { 1}[/tex]
[tex]138.145475 \ g \ Al[/tex]
Round. The original measurement of moles has 3 significant figures, so our answer must also have 3 sig figs.
For the number we calculated, that is the ones place. The 1 in the tenth place tells us to leave the 8.
[tex]138 \ g \ Al[/tex]
There is about 138 grams of aluminum in 5.12 moles.
Explain what is a chemical reaction.
Answer:
Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Explanation:
Answer:
a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Explanation:
Here's an example. When you burn wood, It releases Carbon dioxide, water vapor, and ashes. It just depends what chemicals you use ^^
(b) Sodium hydrogen carbonate is added to acetic acid
noti
Answer:
Solution : When sodium hydrogen carbonate is added to acetic acid then carbon dioxide (CO2) gas is evolved. CO2 trun s lime water milky it is a non supporter of combustion and is absorbed by strong alkalies like NaOH. Sodium hydrogen carbonate when added to acetic acid evolves a gas.
Explanation:
Chemically the ethanoic acid reacts with the sodium hydrogen carbonate to form carbon dioxide gas and water. The carbon dioxide gas produced rushes away from the water. This is seen as bubbles.
Write the congruence condition in symbolic form for each pair of triangles in pic above. If wrong answer I will report. If correct answer I will mark brainliest.
Answer: ABC&AMN are congruent by ASA comgruence
angle A=A
sideAN=AB
angle M=C
Explanation:
1.Chlorobenzene, C6H5Cl, is used in the production of chemicals such as aspirin and dyes. One way that chlorobenzene is prepared is by reacting benzene, C6H6, with chlorine gas according to the following BALANCED equation.
C6H6 (l) + Cl2 (g) C6H5Cl (s) + HCl (g)a.
What is the theoretical yield if 45.6 g of benzene react?
Answer:
[tex]m_{C_6H_5Cl}=65.7gC_6H_5Cl[/tex]
Explanation:
Hello!
In this case, according to the given balanced chemical reaction:
[tex]C_6H_6 (l) + Cl_2 (g) \rightarrow C_6H_5Cl (s) + HCl (g)[/tex]
We can see there is 1:1 between benzene and chlorobenzene as the relavant product; thus, since the molar mass of benzene is 78.11 g/mol and that of chlorobenzene is 112.55 g/mol, the theoretical yield for this reaction turns out:
[tex]m_{C_6H_5Cl}=45.6gC_6H_6*\frac{1molC_6H_6}{78.11gC_6H_6 }*\frac{1molC_6H_5Cl}{1molC_6H_6}*\frac{112.55gC_6H_5Cl}{1molC_6H_5Cl} \\\\m_{C_6H_5Cl}=65.7gC_6H_5Cl[/tex]
Best regards!
PLEASE PLEASE HELP ASAP!
Answer:
Q = 146.25 J
Explanation:
Given that,
The mass of 10 copper pennis = 25 grams
It warm up from 23°C to 38°C.
The specific heat capacity of copper is 0.39 J/g°C
We need to find the energy absorbed by the pennies. The expression for the energy absorbed is given by :
[tex]Q=mc\Delta T\\\\Q=25\times 0.39\times (38-23)\\\\Q=146.25\ J[/tex]
So, 146.25 J of energy is absorbed by the pennies. Hence, this is the required solution.