Answer:
Strontium is the second element placed in the 5th period
Hope this will help you if not so advance sorry :)
Which one please help!!
AgCl⇒ the precipitate
Further explanationGiven
Reaction
2AgNO₃+CaCl₂⇒2AgCl+Ca(NO₃)₂
Required
The precipitate
Solution
Solubility rules :
soluble compound :
All compounds of NO₃⁻ and C₂H₃O₂⁻
Compounds of Cl−, Br−, I− except Ag⁺, Hg₂²⁺, Pb²⁺
So AgCl⇒ the precipitate
Ca(NO₃)₂⇒aqueous
MULTIPLE CHOICE QUESTION
If
you are warming yourself near the
campfire, you are experiencing heat
transfer from the fire, through:
Convection
Conduction
Radiation
Answer:
radiation
Explanation:
The name of the formula MnCl7
I need a lot of help pls help me
Mg(s)+2HCl(aq) → MgCl2(aq)+H2(g)
In an experiment, a student places a small piece of pure Mg(s) into a beaker containing 250.mL of 6.44MHCl(aq) . A reaction occurs, as represented by the equation above.
(a) Write the balanced net ionic equation for the reaction between Mg(s) and HCl(aq) .
Answer:
[tex]Mg(s)+2H^+(aq)\rightarrow Mg^{2+}(aq)+H_2(g)[/tex]
Explanation:
Hello!
In this case, since the writing of a net ionic equation first implies writing the complete molecular equation:
[tex]Mg(s)+2HCl(aq) \rightarrow MgCl_2(aq)+H_2(g)[/tex]
We can see that HCl and MgCl2 are ionized because they are aqueous, thus we write:
[tex]Mg(s)+2H^+(aq)+2Cl^-(aq) \rightarrow Mg^{2+}(aq)+2Cl^-(aq)+H_2(g)[/tex]
In such a way, we can cancel out the chloride ions as they are the spectator ones to obtain the net ionic one:
[tex]Mg(s)+2H^+(aq)\rightarrow Mg^{2+}(aq)+H_2(g)[/tex]
Best regards!
The sugar in your kitchen has a molar mass of 342.3 g/mol. How many particles are present inside a sugar bowl if there are 250 grams of sugar in it?
A. 1.5 x 10^26 particles
B. 6.02 x 10^23 particles
C. 4.4 x 10^23 particles
D. 1.8 x 10^21 particles
Number of particles inside a sugar bowl = 4.4 x 10²³
Further explanationGiven
The molar mass of sugar = 342.3 g/mol
mass of sugar = 250 g
Required
Number of particles
Solution
1 mol = 6.02 x 10²³ particles
mol of sugar :
[tex]\tt mol=\dfrac{mass}{molar~mass}[/tex]
mol = 250 g : 342.3 g/mol = 0.73 mol
Number of particles :
N = n x No
N = 0.73 x 6.02 x 10²³
N = 4.39 x 10²³ ≈ 4.4 x 10²³
What is the name for C2I3
Answer: The correct name for the compound [tex]C_2I_3[/tex] is, Dicarbon triiodide.
Explanation:
[tex]C_2I_3[/tex] is a covalent compound because in this compound the sharing of electrons takes place between carbon and iodine.. Both the elements are non-metals. Hence, it will form covalent bond.
The naming of covalent compound is given by:
The less electronegative element is written first.
The more electronegative element is written second. Then a suffix is added with it. The suffix added is '-ide'.
If atoms of an element is greater than 1, then prefixes are added which are 'mono' for 1 atom, 'di' for 2 atoms, 'tri' for 3 atoms and so on.
Hence, the correct name for the compound [tex]C_2I_3[/tex] is, Dicarbon triiodide..
When iron is combined with copper (1) nitrate, it produces iron (II) nitrate and
copper. Which of the following could NOT be a mole ratio in this chemical
reaction?
A)1 mole Fe / 2 mole Cu
B)1 mole Fe(NO3)2 / 2 mole Cu
C)2 mole Cu(NO3)2 / 2 mole Fe
D)1 mole Fe(NO3)2 / 1 mole Fe
Answer:
C)2 mole Cu(NO3)2 / 2 mole Fe
Explanation:
I'm pretty sure.
When iron is combined with copper (1) nitrate, it produces iron (II) nitrate and copper. The following could NOT be a mole ratio in this chemical reaction is:
D) 1 mole Fe(NO₃)₂ / 1 mole Fe
To determine which of the given mole ratios could NOT be part of the chemical reaction between iron and copper(1) nitrate, we need to write the balanced chemical equation for the reaction and then compare it to the given ratios.
The balanced chemical equation for the reaction is:
Fe + Cu(NO₃)₂ → Fe(NO₃)₂ + Cu
A) 1 mole Fe / 2 mole Cu
This mole ratio is consistent with the balanced chemical equation, where 1 mole of Fe reacts with 2 moles of Cu(NO₃)₂ to produce 1 mole of Fe(NO₃)₂ and 1 mole of Cu. So, this ratio could be part of the chemical reaction.
B) 1 mole Fe(NO₃)₂ / 2 mole Cu
This mole ratio is also consistent with the balanced chemical equation, where 1 mole of Fe(NO₃)₂ is produced by reacting 2 moles of Cu(NO₃)₂. So, this ratio could be part of the chemical reaction.
C) 2 mole Cu(NO₃)₂ / 2 mole Fe
This mole ratio is consistent with the balanced chemical equation, where 2 moles of Cu(NO₃)₂ react to produce 2 moles of Fe(NO₃)₂. So, this ratio could be part of the chemical reaction.
D) 1 mole Fe(NO₃)₂ / 1 mole Fe
This mole ratio implies that 1 mole of Fe(NO₃)₂ is produced by reacting with 1 mole of Fe, which is not consistent with the balanced chemical equation. The equation shows that 1 mole of Fe reacts with 1 mole of Cu(NO₃)₂ to produce 1 mole of Fe(NO₃)₂ and 1 mole of Cu. Therefore, this ratio could NOT be part of the chemical reaction.
So, the correct answer is:
D) 1 mole Fe(NO₃)₂ / 1 mole Fe
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What Is an example of weather?
A. The average rainfall in Arizona over the pervious three months
B. The increase in temperature over North America over the past decade
C. The time for high tide in Daytona Beach today
D. The temperature and wind speed in Philadelphia today
HELP PLEASE
A sudden gust of wind increases the velocity of a sailboat relative to the water surface from 3.0m/s over a period of 30.0s. Using the formula a=change in velocity /t, what is the average acceleration of the sailboat?
•2.5m/s2
•1.2m/s2
•25m/s2
•0.083m/s2
( the 2's are exponents)
Answer:
average velocity for the time interval from t = 2 s to t = 4 s? ... fractional difference in the two methods when a steady wind blows along the car's route and the ... weight, but when the film reaches the drop, the drop's water suddenly ... boat, moving with constant velocity, that is 12 m from the point of impact when the key is.
Explanation:
ABOVE
The average acceleration of the sail boat is 0.083 m/s². Thus option d is correct.
What is acceleration?Acceleration is defined as the rate of change of velocity of an object with respect to time.
It is a vector quantity.
Acceleration can also be defined as the velocity change rate over time, in terms of both speed and direction
Average acceleration is defined as the rate of change of velocity of an object for the particular interval of time.
Average acceleration can also be defined as the change in velocity divided by the time elapsed.
It is measured in meter per second.
Average acceleration = Change in velocity / time
= 5.5 - 3.0 / 30.0
= 0.083 m / s²
Thus, the average acceleration of the sail boat is 0.083 m/s². Thus option d is correct.
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Your question is incomplete, but probably your complete question was
A sudden gust of wind increases the velocity of a sailboat relative to the water surface from 3.0m/s to 5.5m/s over a period of 30.0s. Using the formula a=change in velocity /t, what is the average acceleration of the sailboat?
•2.5m/s2
•1.2m/s2
•25m/s2
•0.083m/s2
2
What is the difference between weight and mass?
A Weight depends on density and mass depends on gravity.
B Weight depends on gravity and mass depends on volume.
C
Mass depends on gravity and weight is constant.
D Welght depends on gravity and mass is constant.
Answer:
Weight is the measure of the force of gravity on an object. The mass of an object will never change, but the weight of an item can change based on its location. For example, you may weigh 100 pounds on Earth, but in outer space you would be weightless.
Explanation:
I can't see the options but I hope this helps!
Answer:
the answer is B.
I hope this helps!
Explanation:
A student is trying to determine the density of a piece of metal. She uses a balance and finds that the mass of the piece of metal is 15.36 g. To determine the volume of the metal she fills a graduated cylinder to 30.0 mL and then drops the piece of metal into the graduated cylinder. The final volume of the metal 34.1 mL. What is the density of the piece of metal
Answer:
3.746 g/mL
Explanation:
Mass of metal = 15.36 g
Initial Volume = 30.0 mL
Final Volume = 34.1 mL
Volume of metal = Final Volume - Initial Volume = 34.1 mL - 30.0 mL
Volume of metal = 4.1 mL
Density = ?
The relationship between the values is given as;
Density = Mass of metal / Volume of metal
Inserting the values;
Density = 15.36 / 4.1 = 3.746 g/mL
The density of the piece of metal is 3.746 g/ml.
How to find the density of any metal?Given the mass of metal is 15.36 g
The initial volume of a cylinder is 30.0 ml
The final volume after putting metal in it is 34.1ml
Step 1- To find the volume:
The volume of metal = Final Volume – Initial Volume 30.0 mL
Volume of metal = 34.1 – 30.0 = 4.1 ml
Volume of metal = 4.1 mL
Step 2- Find the Density:
Density = Mass of metal is divided by the Volume of metal
[tex]\bold{Density = \dfrac{15.36 }{4.1} =3.746 g/ml}[/tex]
Thus, the density is 3.746 g/ml.
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Which equation could be used to solve for the average speed of a car that travels 90m in 20 seconds?
Answer:
Vav=d/t
Explanation:
Because the question already gave d=90m and t=20s. Because the car is the thing that can not travel the same distances at the same times.So the equation is V[tex]\\_{av}[/tex]=[tex]\frac{d}{t} \\[/tex]
Based on the concept of the global conveyor belt, what happens to ocean water as it moves from Antarctica to the equator?
a It transfers thermal energy to deeper layers of the ocean.
b It becomes less dense and rises to the surface.
c It transfers thermal energy to the area, warming the equatorial waters.
d It becomes more dense and sinks to the ocean bottom.
Answer:
c
Explanation:
The ocean water transfers thermal energy to the area, warming the equatorial waters. Therefore, the correct option is option C.
What is thermal energy?In physics and engineering, the phrase "thermal energy" is thrown around in a lot of different situations. It can relate to a variety of distinct physical notions. They include radiation and a body of matter's inherent energy, also known as enthalpy.
Through means besides just thermodynamic work or the movement of matter, including such conduction, radiation, or friction, heat is energy that is moved into or out of a thermodynamic system. Heat is not a property of any single system or something that is "contained" within it; rather, it is a quantity that is transmitted across systems. Internal energy and enthalpy, on the other hand, are characteristics of a single system. The ocean water transfers thermal energy to the area, warming the equatorial waters.
Therefore, the correct option is option C.
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What is public participation? Why is it
necessary for environmental conservation
Answer:
maile pani aii khojeko tmle sideko dekhya ani thicheko ani comment garya haha
what????????????????????????????????????????????????
Answer:
I
Explanation:
d
k
uhm....is there anything you need help with?
A root is an example of a/an-
A: tissue
B: cell type
C:organ
D:organism
Answer: D an organism
Explanation:
if Fe(NO3)3 is dissolved in enough water to make exactly 323 ml of solution, what is the molar concentartion of nitrate ion g
The given question is incomplete. the complete question is : If 5.15 g[tex]Fe(NO_3)_3[/tex] is dissolved in enough water to make exactly 323 ml of solution, what is the molar concentartion of nitrate ion.
Answer: The molar concentartion of nitrate ion is 0.195.
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.
Given : 5.15 g of [tex]Fe(NO_3)_3[/tex] is dissolved
Volume of solution = 323 ml
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n= moles of solute
[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{5.15g}{242g/mol}=0.021moles[/tex]
[tex]V_s[/tex] = volume of solution = 323 ml
[tex]Molarity=\frac{0.021\times 1000}{323}=0.065M[/tex]
As 1 M of [tex]Fe(NO_3)_3[/tex] gives 3 M of [tex]NO_3^-[/tex] ions.
Thus 0.065 M of [tex]Fe(NO_3)_3[/tex] gives = [tex]\frac{3}{1}\times 0.065=0.195M[/tex] of [tex]NO_3^-[/tex] ions.
The molar concentartion of nitrate ion is 0.195.
What causes the moon to be illuminated?
A. concave
B. reflection
C. medium
D. refraction
Answer:
Reflection
Explanation:
The light from Earth's surface, reflected back towards the Moon, can illuminate it all the same. This is why, when the Moon is in a crescent phase, you can still see features on the dark portion of the Moon: we call this reflected, illuminating light the phenomenon of Earthshine.
What type of chemical reaction is taking place?
A. Synthesis
B. decomposition
C. single replacement
D. double replacement
double replacement
Explanation:
it's double replacement
Find the volume, in Liters, of 2.5 x 1024 molecules of chlorine gas at STP.
Answer:
V = 93.0 L
Explanation:
Hello!
In this case, when computing the PVT properties for an ideal gas, we need to use the following equation:
[tex]PV=nRT[/tex]
In such a way, for 2.5 x 10²⁴ molecules of chlorine at STP (273.15 K and 1.00 atm) we first need the moles based on the Avogadro's number:
[tex]n = 2.5x10^{24}molec*\frac{1mol}{6.022x10^{23}molec} = 4.15mol[/tex]
Now, we solve for volume on the ideal gas equation to obtain:
[tex]V=\frac{nRT}{P}[/tex]
So we plug in and get:
[tex]V=\frac{4.15mol**0.08206\frac{atm*L}{mol*K}*273.15K}{1.00atm}\\\\V=93.0L[/tex]
Best regards!
a pure sample of an unknown molecule has a mass of 0.03551 kg and contains 0.2000 moles wbat is the molecular weight of the substance
Answer:
No
Why?
Explanation:
A pure sample of an unknown molecule has a mass of 0.03551 kg and contains 0.2000 moles.
What is the molecular weight of the substance?
Answer:
177.6 g/mol
Explanation:
Trust me
A sample of hydrate sodium carbonate has a mass of 71.5 g. after heating, the anhydrous sodium carbonate has a mass of 26.5 grams. Calculate the % water.
Answer:
62.9%
Explanation:
Step 1: Given data
Mass of hydrate sodium carbonate (mNa₂CO₃.xH₂O): 71.5 gMass of anhydrous sodium carbonate (mNa₂CO₃): 26.5 gStep 2: Calculate the mass lost of water
We will use the following expression.
mH₂O = mNa₂CO₃.xH₂O - mNa₂CO₃
mH₂O = 71.5 g - 26.5 g = 45.0 g
Step 3: Calculate the percent of water in the hydrate sodium carbonate
We will use the following expression.
%H₂O = mH₂O / mNa₂CO₃.xH₂O × 100%
%H₂O = 45.0 g / 71.5 g × 100%
%H₂O = 62.9%
How can you tell S-wave arrival from the end of the P-wave?
Answer:
The P wave will be the first wiggle that is bigger than the rest of the little ones (the microseisms). Because P waves are the fastest seismic waves, they will usually be the first ones that your seismograph records. The next set of seismic waves on your seismogram will be the S wavesif an atom with a mass number of 27 has 14 neutrons,it is an isotope of which element
Answer:
the number of neutrons in above isotope = A - Z = 27 - 13 = 14. Note: The molar mass of aluminium, which is average of atomic masses of all isotopes = 26.981538 g/mol, since 13Al27 is the major isotope.
Explanation:
Answer:
Aluminum
Explanation
mass number = number of protons + number of neutrons
Number of protons = mass number - number of neutrons
No of protons = 27-14 = 13
Aluminum contains 13 protons
A patient is prescribed 100mg/day of antibiotic for 2 weeks. The antibiotic is available in vials that contain 20mg/vial of the drug. How many vials are necessary for the entire treatment?
Which chemical equation is balanced?
a. 2LiOH + CO2 → Li2CO3 + H2O
b. LiOH + CO2 → Li2CO3 + H2O
c. LiOH + 3CO2 → 2Li2CO3 + H2O
d. 4LiOH + CO2 → Li2CO3 + 2H20
The balance chemical equation is 2LiOH + CO2 → Li2CO3 + H2O. Therefore, option A is correct.
What is balance chemical equation ?A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.
The law of conservation of mass states that when a chemical reaction takes place, the mass of the reactants and products should be equal. As a result, during the chemical process, the number of atoms in each element remains constant. The chemical equation must be balanced as a result.
The chemical equation is said to be balanced if there are no inequalities. Every element in this illustration now has the same amount of atoms on the reactant and product sides.
Thus, option A is correct.
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Question 4
Being Left Handed is a recessive trait so it would be represented by two lowercase letters like (hh)
Your answer:
O
True
False
Answer:
True
Explanation:
Which one of these is NOT one of the characteristics of living things?
A.All living things reproduce.
B.All living things are composed of one or more cells.
C.All living things grow develop and have life spans.
D.All living things provides heat and light on Earth.
Answer:
D. All living things provides heat and light on Earth.
Explanation:
its the sun that does that
Answer:
option d.
Explanation:
all living things provides heat and light on Earth.
at the molecular level what form of energy do the molecules have?
Answer:
kinetic energy I think so
The form of energy molecules have at the molecular level is Kinetic energy.
Kinetic energy is defined as the energy possessed by a body as a result of its motion or movement.
Molecules interact with one another through various movements that occur
within them. This happens to aid the formation of new substances in the
ecosystem. The three states of matter exhibit varying degree of movement
within its molecules.
The energy is usually in the form of chemical energy also and is the reason
why kinetic energy is the most suitable choice.
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If a piece of cadmium with a mass of 37.60 g and a temperature of 100.0 oC is dropped into 25.00 cc of water at 23.0 oC, what will be the final temperature of the system
Answer:
[tex]T_{eq}=28.9\°C[/tex]
Explanation:
Hello!
In this case, since it is observed that hot cadmium is placed in cold water, we can infer that the heat released due to the cooling of cadmium is gained by the water and therefore we can write:
[tex]Q_{Cd}+Q_{W}=0[/tex]
Thus, we insert mass, specific heat and temperatures to obtain:
[tex]m_{Cd}C_{Cd}(T_{eq}-T_{Cd})+m_{W}C_{W}(T_{eq}-T_{W})=0[/tex]
In such a way, since the specific heat of cadmium and water are respectively 0.232 and 4.184 J/(g °C), we can solve for the equilibrium temperature (the final one) as shown below:
[tex]T_{eq}=\frac{m_{Cd}C_{Cd}T_{Cd}+m_{W}C_{W}T_{W}}{m_{Cd}C_{Cd}+m_{W}C_{W}}[/tex]
Now, we plug in to obtain:
[tex]T_{eq}=\frac{37.60g*0.232\frac{J}{g\°C}*100.00\°C+25.00g*4.184\frac{J}{g\°C}*23.0\°C}{37.60g*0.232\frac{J}{g\°C}+25.00g*4.184\frac{J}{g\°C}}\\\\T_{eq}=28.9\°C[/tex]
NOTE: since the density of water is 1g/cc, we infer that 25.00 cc equals 25.00 g.
Best regards!