Answer:
The atoms have the same chemical symbol.
Answer:
C
Explanation:
What is the equation to calculate speed?
Answer:
speed = distance ÷ times
Answer:
speed is distance divided by time, hope this helps
Which of these statements is false?
A. All matter is made up of atoms.
B. Atoms are made up of protons,
neutrons, and electrons.
C. Atoms contain chemical bonds.
D. Atoms are the smallest particles of
elements.
Answer:
C is the false one atoms contain chemical bonds
Answer:
C. Atoms contain chemical bonds.
Reason:
Atoms don't have any chemical bonds. Molecules are the particles have chemical bonds.
How much would the temperature of a 34.2 g sample of argon gas decrease when 2.8 kJ of heat is removed?
Your answer should be in °C.
Answer:
8.90
Explanation:
because I calculated it
What type of reaction is shown here. NaCl + LiF = NaF + Lici*
Answer:
displacement reaction
Explanation:
more reactive sodium displaces lithium
NaCl + LiF ⇒ NaF + LiCl
3.Which of these is NOT part of the cell theory? * "
all living things are made of cells
Ocells come only from other cells
cells are the smallest living unit of an organism
O all living things have blood cells
Answer:
Cells are the smallest living unit of an organism
Answer:
all living things living things have blood cells
Explanation:
this is because robert hooke did not make this apart of the theory
Which of the following particles has the smallest
mass?
A) electron
C) neutron
B) hydrogen atom
D) proton
Answer:
AN ELECTRON HAS THE SMALLEST MASS!
Answer:
A) electron
good luck, i hope this helps :)
How do you find the concentration of spectator ions?
Answer:
A spectator ion is an ion that does not take part in the chemical reaction and is found in solution both before and after the reaction. In the above reaction, the sodium ion and the nitrate ion are both spectator ions. The equation can now be written without the spectator ions.
Explanation:
An airplane has a mass of 12,000kg. If it is accelerating at 16m/sec2, what is its force?(round to the nearest whole number) NEED THIS ASAP
Answer:
[tex]F=1.92x10^5N[/tex]
Explanation:
Hello!
In this case, since the force exerted by an object with a certain mass an acceleration is:
[tex]F=m*a[/tex]
We can plug in the given mass of 12,000 kg and acceleration of 16 m/s^2 to obtain:
[tex]F=12,000kg*16m/s^2\\\\F=192,000kg*m/s^2\\\\F=1.92x10^5N[/tex]
Best regards!
Key Questions and Terms Notes
The way that light waves interact with different mediums is called the ________.
When does reflection occur?
Light reflects off of the medium at a ________ angle to which it initially struck the material. This means that if light hits a mirror at a 40-degree angle, it will bounce off at a ___ degree angle. Draw a picture of what this looks like.
When does refraction occur?
When light can pass through an object, it is called ________.
When does absorption occur?
Describe how visible light interacts with these materials:
Mirror:
Glass of water:
Dark fabric:
What are some examples of matter waves?
What are some examples of electromagnetic waves?
How are electromagnetic waves different from matter waves?
Would outer space be an ideal spot for a concert? Why or why not?
________ waves need to interact with particles of either a solid, liquid, or gas to travel.
Light Waves and Sound Waves
Record your findings about sound and light waves for each of the following.
Traveling through air
Traveling through metal
Why light travels faster
Answer:
Following are the solution to the given question:
Explanation:
Its interactions among light waves as well as different media were also called light products.Even before sound rays hit a medium, the light rays bounce off.Even at a similar angle with which the material initially struck its medium, sunlight reflecting.When the light hits a mirror at such an angle of forty degrees, everything just rebonds at an angle of 40 degrees.When light waves pass via a transparent medium, those who bend as well as change their direction.Light is called transparent if it can pass via an object.Whenever light waves strike a platform, this is neither re-elected nor refracted, nor expected to move.The light of interacts with these materials are:Reflection Mirror:
Water glass: refractive
Dark fabricate: Absorption
Sound waves and waves of water are examples of matter waves.Light waves and X-rays are electromagnetic waves.There is no need for sound radiation to pass through a medium/requirement to communicate with other particles to travel like waves of matter.No, even though sound waves didn't reach through the space vacuum.Matter waves should interact with solid, liquid, or gas particulates to travel.The light waves pass thru the air more quickly than sound waves.
Sound waves almost always go through a metal frame.
Light waves travel faster than electrical signals even though they don't have to crash in electromagnetic waves to particles.
Hello, this is a science task and it is due today I would really appreciate it if you guys can help me answer and explain what is the difference between expansion and contraction:) I will mark brainliest!
Answer:
Expansion: increase in size Contraction: decrease in size
Explanation:
The increase in size of an object on heating is called expansion where as the decrease in size of an object on cooling is called contraction.
2. What is the percent composition of Mg(IO3)2?
Answer:
Mass percentage 6.4967
Explanation:
I had some study notes
Zn(s) + 2 HCl(aq) —> ZnCl2(aq)
+ H2(g)
If a scientist wanted to create 10L of hydrogen gas at RTP, what mass of HCl would they need to start with?
Answer:
First write the balanced equation for the reaction of HCl with Zn (NOTE: the previous answer did NOT do this and thus obtained an incorrect answer)
Zn + 2HCl ==> ZnCl2 + H2(g)
moles of H2 desired: PV = nRT
n = PV/RT = (1 atm)(10L)/(0.0821 Latm/Kmol)(298K)
n = 0.409 mole H2 desired
moles Zn needed:
0.409 moles H2 x 1 mole Zn/2 moles HCl = 0.204 moles Zn needed
mass Zn needed = 0.204 moles Zn x 65.4 g/mol = 13.4 g Zn needed (to 3 sig. figs.)
Explanation:people always get this wrong but i got you
(b) Why must acidic gases be treated before they are released into the atmosphere?
Answer:
because they react with other gases of atmosphere and pollute the environment
PLEASE HELP!! PLEASE HELP PLEASE HELP PLEASE HELP!!!
CHEMISTRY DIMENSIONAL ANALYSIS DUE IN 5 MINUTES!!!!
Answer:
37.6 Km/h
Explanation:
From the question given above, the following data were obtained:
Distance = 100 m
Time = 9.58 s
Speed =?
Next, we shall convert 100 m to Km. This can be obtained as follow:
1000 m = 1 Km
Therefore,
100 m = 100 m × 1 Km / 1000 m
100 m = 0.1 km
Next, we shall convert 9.58 s to h. This can be obtained as follow:
3600 s = 1 h
Therefore,
9.58 s = 9.58 s × 1 h / 3600 s
9.58 s = 2.66×10¯³ h
Finally, we shall determine the speed. This can be obtained as follow:
Distance = 0.1 km
Time = 2.66×10¯³ h
Speed =?
Speed = Distance / Time
Speed = 0.1 / 2.66×10¯³
Speed = 37.6 Km/h
An animal can ____.
(A) only be prey or predator
(B) be both prey and predator
(C) choose to be prey or predator
Thanks if u help / this is for science they just didn’t have that
What is delta Gº for the following reaction at 25 °C?
CO(g) + 2 H2(g) = CH OH(9)
Ky = 2.1 x 10-4
Answer:
21 kJ/mol
Explanation:
Step 1: Given and required data
Temperature (T): 25 °C (298 K)Equilibrium constant (Kc): 2.1 × 10⁻⁴Ideal gas constant (R): 8.314 J/K.molStep 2: Write the balanced equation at equilibrium
CO(g) + 2 H₂(g) ⇄ CH₃OH(g)
Step 3: Calculate the standard Gibbs free energy of the reaction (ΔG°)
We will use the following expression.
ΔG° = - R × T × ln Kc
ΔG° = - (8.314 J/K.mol) × 298 K × ln 2.1 × 10⁻⁴ = 2.1 × 10⁴ J/mol = 21 kJ/mol
help asap pls,
find the percent composition
Explanation:
1. Pb(CO3)2
Element Number Mass Percet Composition
Oxygen 6 16.00 29.34%
Carbon 2 12.01 7.34%
Lead 1 207.21 63.32%
2. Ga(OH)3
Element Number Mass Percet Composition
Hydrogen 3 1.0079 2.50%
Oxygen. 3 16.00 39.75%
Gallium 1 69.72 57.74%
3. P4O10
Element Number Mass Percet Composition
Oxygen. 10 16.00. 56.36%
Phosphorus. 4 30.97 43.64%
4. Ca3P2
Element Number Mass Percet Composition
Phosphorus 2 30.97 34.00%
Calcium. 3 40.08 66.00%
5. Ti(NO3)3
Element Number Mass Percet Composition
Oxygen. 9 16.00 61.56%
Titanium. 1 47.87 20.47%
Nitrogen. 3 14.01 17.97%
Help me plsss
What is the mass in grams of H₂ that can be formed from 47.2 grams of NH₃ in the following reaction?
2 NH₃(g) → 3 H₂(g) + N₂(g)
Answer:
8.34
Explanation:
1) how much moles of NH₃ are in the reaction;
2) how much moles of H₂ are in the reaction;
3) the required mass of the H₂.
all the details are in the attachment; the answer is marked with red colour.
Note1: M(NH₃) - molar mass of the NH₃, constant; M(H₂) - the molar mass of the H₂, constant; ν(NH₃) - quantity of NH₃; ν(H₂) - quantity of H₂.
Note2: the suggested solution is not the shortest one.
PLEASE HELP!! DIMENSIONAL ANALYSIS USING METRIC CONVERSIONS!!!
I am so confused and am so lost despite all the videos i’ve tried watching, please help!!
Answer: Simpe its 1
Explanation:I took that quiz before hope this helps :)
why is seawater a better conductor of electricity than freshwater?
Answer:
please refer to the attachment above;)
Answer:
Because it contains Na+ and Cl- ions, Which are conductors of electricity
Explanation:
Hail is falling down from the sky at 50 miles per hour. Is this an example of speed,
velocity or acceleration?
Explanation:
tgggghhhhijyyhhjjjjjjjj
The process utilized to save an organism's DNA for use in the future is:
A tissue biopsy
B DNA
C clone
D genetic preservation
Answer:
I believe it's D!
Explanation:
B is what is being saved, C is a potential creation of, A is a method.
write a chemical equation that represents baking soda (NaHCO3) reacts with hydrochloric acid (HCI) to produce sodium chloride, water and carbon dioxide
Answer:
NaHCO3 + HCl = NaCl + H2O + CO2
Explanation:
The total number of atoms of each element on either side of the equation must be equal.
According to this video, how do scientists use data to study/monitor earthquakes and tsunamis?
Answer:
ewan ko po
Explanation:
sana makatulong
if you were one of the immigrants, would you willingly submit to have yourself undergone x-ray to prove yourself being a minor? why or why not?
Answer:
I'm pretty sure this is a question about your opinion so there is no wrong answer! Just think about the question and if you were in those shoes. There is no right or wrong answer! :)
Explanation:
I forgot, does odor have volume?
Answer: oder has mass
Explanation:
How many moles are in 1.51x10^26 atoms of xenon (Xe)? Please and thank you :)!!
251 mol Xe
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
[Given] 1.51 × 10²⁶ atoms Xe
[Solve] moles Xe
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 1.51 \cdot 10^{26} \ atoms \ Xe(\frac{1 \ mol \ Xe}{6.022 \cdot 10^{23} \ atoms \ Xe})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 250.747 \ mol \ Xe[/tex]Step 4: Check
Follow sig fig rule and round. We are given 3 sig figs.
250.747 mol Xe ≈ 251 mol Xe
Solution of an unknown concentration that has another solution slowly added to it _____________. A reagent added to the analyte solution that changes color when the reaction is complete ___________. Glassware that allows a solution to be precisely and slowly added to another solution ____________Solution of known concentration that is slowly added to a solution of unknown concentration ____________ When the required amount of one solution has been added to the second solution to complete the reaction __________ Process of slowly adding a solution to react with another solution and determine the concentration of one of the solutions based on the reaction between them _________
Answer:
Solution of an unknown concentration that has another solution slowly added to it Analyte.
A reagent added to the analyte solution that changes color when the reaction is complete Indicator .
Glassware that allows a solution to be precisely and slowly added to another solution burette.
Solution of known concentration that is slowly added to a solution of unknown concentration titrant.
When the required amount of one solution has been added to the second solution to complete the reaction end point.
Process of slowly adding a solution to react with another solution and determine the concentration of one of the solutions based on the reaction between them Titration.
10. Imagine that the unknown solution contains aqueous ammonium sulfate, which is commonly used in fertilizer. For the precipitation of barium sulfate after mixing aqueous ammonium sulfate solution and barium chloride solution (the reactants), write the (1) balanced molecular equation, (2) the complete ionic equation, (3) the net ionic equation AND identify the spectator ions, if any.
Answer:
(1) (NH₄)₂SO₄(aq) + BaCl₂(aq) ⇒ BaSO₄(s) + 2 NH₄Cl(aq)
(2) 2 NH₄⁺(aq) + SO₄²⁻(aq) + Ba²⁺(aq) + 2 Cl⁻(aq) ⇒ BaSO₄(s) + 2 NH₄⁺(aq) + 2 Cl⁻(aq)
(3) SO₄²⁻(aq) + Ba²⁺(aq) ⇒ BaSO₄(s)
(4) NH₄⁺ and Cl⁻
Explanation:
(1) Let's consider the molecular equation that occurs after mixing aqueous ammonium sulfate solution and barium chloride solution. This is a double displacement reaction.
(NH₄)₂SO₄(aq) + BaCl₂(aq) ⇒ BaSO₄(s) + 2 NH₄Cl(aq)
(2) The complete ionic equation includes all the ions and insoluble species.
2 NH₄⁺(aq) + SO₄²⁻(aq) + Ba²⁺(aq) + 2 Cl⁻(aq) ⇒ BaSO₄(s) + 2 NH₄⁺(aq) + 2 Cl⁻(aq)
(3) The net ionic equation includes only the ions that participate in the reaction (not spectator ions) and the insoluble species.
SO₄²⁻(aq) + Ba²⁺(aq) ⇒ BaSO₄(s)
(4) The spectator ions are NH₄⁺ and Cl⁻.
For the balanced equation shown below, what would be the limiting reagent if 42.3 grams
of N2O5 were reacted with 9.18 grams of H2O?
N2O5+H2O---> 2HNO3
A. HNO3
B. H20
C. N205
Answer: A. HNO3
Explanation: