Answer:
uh.. How many do you want done??
Explanation:
PLEASE PLEASE HELP ITS PAST DUE AND IM CLUELESS ILL GIVE BRAINLIEST TO THE FIRST CORRECT ANSWER
Which of the following would be the evidence of a physical change?
a. change in state of matter
b. precipitate was formed
c. unexpected change in odor
d. formation of bubbles
Answer:
[tex]\boxed {\boxed {\sf A. \ Change \ in \ state \ of \ matter}}[/tex]
Explanation:
A physical change occurs when only the physical properties change. They are generally reversible and no new substances are formed.
However, in a chemical change, the chemical structures and properties change, plus new substances are formed.
Let's analyze each answer choice.
1. Change in state of matter
The state of matter is a physical property, so this is a physical change.
2. Precipitate was formed
A precipitate is a solid formed in a liquid solution. This is a new substance and a chemical change.
3. Unexpected change in odor.
A change in odor is a sign of chemical change.
4. Formation of bubbles
Bubbles signify the formation of gas or a new substance.
So, the best answer choice is A. change in state of matter
Question:
Which of the following would be the evidence of a physical change?
a. change in state of matter
b. precipitate was formed
c. unexpected change in odor
d. formation of bubbles
Answer:
A. Change in state of matter!
Explanation:
How to know it evidence of physical change!
EXPECTED color change.Change in SIZE or SHAPE.Change in state of matter.Reversible.No NEW substance formed!You are designing a new product that requires the use of a stable, nonreactive
gas. Which gas would be most suitable?
A. Oxygen, o
B. Fluorine, F
C. Helium, He
D. Hydrogen, H
The gas which would be most suitable for the product is Helium.
What is a gas?A gas is the third state of matter in which there is little intermolecular bonding between the molecules of the substance. Gases usually occupy their container and usually have low boiling point
Gas most suitableSince Oxygen, Fluorine and Hydrogen are group 6, 7 and 1 respectively. These three gases are reactive and would only be stable when they achieve their stable octet configuration. Whereas, Helium which is a noble gas already has a stable duet configuration and is thus non-reactive.So, the gas which would be most suitable for the product is Helium.
Learn more about gases here:
https://brainly.com/question/22688430
conduction or convection
1.When you put your hand above a pan filled with boiling water, does your hand warm-up because of convection or conduction?
2.If you touch the pan, does your hand warm-up because of convection or conduction?
3.Based on your answers, which type of heat transfer moves heat more easily and efficiently?
Answer:
1 radiation
2 conduction
3 radiation
In the northern hemisphere, free moving objects traveling over large distances are deflected to the ____________ Of their intended path of motion
Answer:
the answer is right
Explanation:
hope this helps
or whatever cameron said, give cam brainliest
have a good day:)
Write a balanced molecular, ionic, and net ionic equation for the following reaction. Assume the reaction occurs in
aqueous solution.
K2(C2O4)(aq)+CaCl2(aq) to
2KCl(aq)+ Ca(C2O4)(s)
balanced?
Ionic Equation:
Net Ionic Equation:
Answer: The balanced molecular equation is:
[tex]K_2(C_2O_4)(aq)+CaCl_2(aq)\rightarrow 2KCl(aq)+Ca(C_2O_4)(s)[/tex]
The ionic equation is:
[tex]2K^+(aq)+C_2O_4^{2-}(aq)+Ca^{2+}(aq)+2Cl^-\rightarrow 2K^+(aq)+2Cl^-(aq)+Ca(C_2O_4)(s)[/tex]
The net ionic equation:
[tex]C_2O_4^{2-}(aq)+Ca^{2+}(aq)\rightarrow Ca(C_2O_4)(s)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The balanced molecular equation is:
[tex]K_2(C_2O_4)(aq)+CaCl_2(aq)\rightarrow 2KCl(aq)+Ca(C_2O_4)(s)[/tex]
Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.
The ionic equation is:
[tex]2K^+(aq)+C_2O_4^{2-}(aq)+Ca^{2+}(aq)+2Cl^-(aq)\rightarrow 2K^+(aq)+2Cl^-(aq)+Ca(C_2O_4)(s)[/tex]
The ions which are present on both the sides of the equation are potassium and chloride ions. and hence are not involved in net ionic equation.
The net ionic equation:
[tex]C_2O_4^{2-}(aq)+Ca^{2+}(aq)\rightarrow Ca(C_2O_4)(s)[/tex]
What is the name of Br6F10 ?
Answer:
Bromine fluoride
what type of chemical reaction is SrCl2 + F2 → SrF2 + Cl2
covalent compounds contain
Answer: Covalent compounds have bonds where electrons are shared between atoms. Due to the sharing of electrons, they exhibit characteristic physical properties that include lower melting points and electrical conductivity compared to ionic compounds.
hope this helps!
Explanation:
4.91 M NaOH solution (density=1.04g/ mL)
_______ mL = 500 cm^3
Answer:
500 mL
Explanation:
500 cm is equal to 500 mL
An aluminum ion has 13 protons, 14 neutrons, and 10 electrons. What is the charge of the aluminum ion?
Answer:
+3
Explanation:
-10 + 13 = +3
-10 IS THE NUMBER OF ELECTRONS
13 IS THE NUMBER OF PROTONS
As the aluminum ion is having 10 electrons and 13 protons, means it will be having +3 charge.
What are protons?A proton is a stable subatomic particle with the symbol p, H+, or 1H+ and an elementary charge of +1e.
It has a slightly lower mass than a neutron and has 1836 times the mass of an electron due to the proton-to-electron mass ratio.
Protons and neutrons are made up of two types of quarks: up quarks and down quarks.
Each up quark carries a +2/3 charge. Each down quark has a -1/3 charge. The electrical charge of a nuclear particle is determined by the sum of the charges of the quarks that comprise it.
Because the aluminum ion has 10 electrons and 13 protons, it will have a +3 charge.
Thus, the charge of aluminum atom is +3.
For more details regarding protons, visit:
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How many moles are in 3.24 x 1020 particles of lead? (show work plz)
0.000538 mol Pb
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
3.24 × 10²⁰ particles Pb (lead)
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 3.24 \cdot 10^{20} \ particles \ Pb(\frac{1 \ mol \ Pb}{6.022 \cdot 10^{23} \ particles \ Pb})[/tex]Multiply/Divide: [tex]\displaystyle 0.000538 \ mol \ Pb[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
Our final answer is in 3 sig figs, no need to round.
Remember! All ___________________________ are __________________________
but not all Atoms are elements.
Answer:
all element are atom but all at all atom are element
Explanation:
because all atoms of an element are same whereas atom of different element are different
a. Identify the type of reaction shown:
Li + CaCl2 ---> LiCl + Ca
Answer:
single-replacement reactions
Explanation:
A single-replacement reaction is defined as a chemical reaction in which one strong element replace the other weak element.
The given chemical equation Li + CaCl2 ---> LiCl + Ca is an example of single-replacement reactions in which Lithium (Li) is stronger than Calcium (Ca) and replaces calcium to form bond with Chloride.
Hence, the correct answer is "single-replacement reactions".
Which of these make up the mass of an atom?
Answer:
Protons, neutrons and electrons, and what makes up the mass of those, well for protons and neutrons quarks, and for electrons, there are indivisible, that is nothing makes them up, they are fundamental particles, you can find them on the standard model of particle physics
Explanation:
If a solutions is made
by adding 32 grams of
sugar to 50 Kg of
water, what would be
the percent by mass?
Answer: The mass percent is 0.064%
Explanation:
To calculate the mass percent of solute in a given solution, we use the formula:
Mass of sugar (solute) = 32 g
Mass of solvent = 50 kg = 50000 g ( 1kg=1000g)
Putting values in above equation, we get:
[tex]\text {mass percent}=\frac{32}{32+50000}\times 100=0.064\%[/tex]
Hence, the mass percent is 0.064%
What is the process where plants make seeds that grow into new plants
Answer:
Plant fertilization
Explanation:
Hope this helps:) Have a great day
Please give Brainliest if could
What volume will 0.75 mole of oxygen gas occupy at
STP?
1). 16.8 L
2). 20.0 L
3). 22.4 L
4). 33.6 L
Answer:
Answer: Number 1 16.8 L
Answer:
16.78 liters
Explanation:
Volume occupied by oxygen gas at STP is 16.78 liters
What is the speed of a jet that flies 3200 miles in 20 hours?
160 mph
3180 mph
3220 mph
64000 mph
Answer:160
Explanation:3200/20=160
Answer:
about 160 mph
Explanation:
Any kind of help would be nice :)
Answer:
1st page, number a-ENergy is added or absorbed
I cant see the answers on the 2nd page
Explanation:
Answer:
1. A gas is released.
2. Energy is absorbed.
3. Color change.
4. Energy is given off.
5. Change in odor.
Explanation:
What is the final, balanced equation that is formed by combining these two half reactions? 2 equations: first: upper C u right arrow upper C u superscript 2 plus, plus 2 e superscript minus. Second: upper N upper O subscript 3 superscript minus, plus 2 e superscript minus, plus 2 upper H superscript plus right arrow upper n upper O subscript 2 superscript minus plus upper H subscript 2 upper O.
Answer: [tex]Cu+NO_3^-+2H^+\rightarrow Cu^{2+}+NO_2^-+H_2O[/tex]
Explanation:
Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.
Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.
[tex]Cu\rightarrow Cu^{2+}+2e^-[/tex] (1)
Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.
[tex]NO_3^-+2e^-+2H^+\rightarrow NO_2^-+H_2O[/tex] (2)
Combining (1) and (2) we get:
[tex]Cu+NO_3^-+2H^+\rightarrow Cu^{2+}+NO_2^-+H_2O[/tex]
The balanced reaction equation for the reaction described in the question is; Cu + NO3^- + 2H^+ ------> Cu^2+ + NO2^- + H2O
What is a balanced reaction equation?
An equation is said to be balanced when the total number of atoms of each element on the right hand side of the reaction equation is equal to the total number of atoms of the same element on the left hand side of the reaction equation.
The balanced reaction equation for the reaction described in the question is; Cu + NO3^- + 2H^+ ------> Cu^2+ + NO2^- + H2O
Learn more about reaction equations: https://brainly.com/question/1170557
Which of the following is an acid?
a) Mg(OH)2
b) Al(OH)3
c) H2CO3
d) NH4OH
Answer:
C
Explanation:
a) is magnesium hydroxide
b) is aluminium hydroxide
c) is carbonic acid
d) is ammonium hydroxide
Molar mass is the molecular (formula) mass of any substance expressed in which unit?
A). moles
B). kilograms
C). liters
D). grams
D. grams
Molar mass:
The molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sampleIt is given by this formula:[tex]M=\frac{m}{n}[/tex] ; where m= mass of substance in g and n= number of moles.Molar mass is expressed in grams per mole.For example: Molar mass of oxygen is 16 g/mol , Molar mass of carbon is 12g/mol.Learn more:
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Ionic and polar compounds usually dissolve in what kind of solvents
Answer: They usually dissolve in Polar Solvents
Explanation:
Answer: Ionic/ Polar solvents.
Explanation:
• Ionic or polar compounds will dissolve in ionic or polar solvents.
• Water is a universal solvent because it can dissolve both ionic and polar covalent compounds.
Which is a chemical property of sulphur?
A. It is a solid.
B. It is combustible.
O c. It is odorless.
D. It is yellow.
O E. It has density.
A, O and D
and its sulfur luv ♡ not sulphur
plzzz help and thank u
Answer:
sports reporter
Explanation:
wnba
9.32 x 1024 atoms of NaOH
Explanation:
65463.68 atoms of NaOh I believe.. I really dont know sorry
How many moles of magnesium is 6.02 x 1022 atoms of magnesium?
Answer: 0.0500
Explanation:
. If a second polarizer is set up that is horizontal, what, do you suppose, happens with the
vertical component or the light, in general?
Single displacement (replacement)
Explanation:
Single displacement (replacement) is kind of reaction in which 1 atom of reactants only change in product.