plssss help me I only have 10 mins.

Answer:

The balanced chemical equation is Pb(NO3)2 + 2KI produces PbI2 + 2K(NO)3. In chemistry, this is called a double replacement reaction. Lead nitrate and potassium iodide, which are the reactants, are powders that react to form a yellow-colored lead iodide and a colorless potassium nitrate.

Explanation:

Answer:

2KI+Pb(NO3)2 ⇒ PbI2 + 2KNO3

Answer:

D. solid candle wax near the flame melts as the candle burns.

Answer:

Part D, melting is a product of heating

Explanation:

Answer:

Matter is anything that has mass and takes up space.I think there is takes up already synonym to occupies.

Answer:

scientific law is the answer of these questions

Answer:

are very reactive

Explanation:

Answer:

122.5 Joule, or 122.5 j

Explanation:

Given,

mass of the object (m) = 5 kg

velocity of the object (v) = 7 m/s

Kinetic energy = [tex]\frac{1}{2}[/tex] × m × v²

Applying the formula:

Kinetic energy = [tex]\frac{1}{2}[/tex] × 5 × 7²

⇒ [tex]\frac{1}{2}[/tex] × 5 × 7 × 7

⇒ [tex]\frac{245}{2}[/tex]

⇒ 122.5 Joule, or 122.5 j

Kinetic energy is the energy that an object gains as the result of the motion.  It also depends on the mass of the object and force with which the motion is applied.  In the given question, the mass of the object is 5 kg and the force of the velocity by which it is moving is 7 m/s.

Answer:

Its A, sorry I wrote something else.

Explanation:

The equator is the warmest, and the sunlight is not pointing towards point A.\

Friendly guy that likes to help

Explanation:

[tex] \frac{given \: mass}{molar \: mass} [/tex]

hope it helps:)

Answer:

here is the answer

Explanation:

The epididymis

Answer:

Vas deferens.

Explanation:

A long tube that is located near each testicle. The epididymis is the tube which moves the sperm from the testicles. Vas deferens. This is a tube in which the sperm is stored and it carries the sperm out of the scrotal sac.

If Veronica spins in a circle with the compass in her hand, then the force which keeps the compass' needle pointing north is magnetic field.

The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. In a magnetic field, a moving charge receives a force that is perpendicular to both its velocity and the magnetic field.

Hence the required force is a magnetic force.

To know more about magnetic forces, visit the below link:

https://brainly.com/question/14411049

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the law of conservation of mass applies.....?

Answer:

They are neutral

Explanation:

Salts are chemical compounds formed when acids and a bases are combined together. Both substances nuetralize each other as they react, thereby forming salts which are neutral substances. This resultant compounds are neither basic nor acidic. They have a pH of 7, which makes them neutral in nature.

Answer:

There is 61.538% oxygen in Al2(SO4)3.

Explanation:

Wt Of oxygen in the compound = 12*16 = 192 amu.

Total Wt. Of the compound = 2*12+3*32+12*16 = 312 amu.

Thus, percent of oxygen = Wt of oxygen/total Wt. Of compound *100

= 192/312 * 100=61.538 %

Answer:

16

Explanation:

Answer:

Oxygen has an atomic number of 8

Explanation:

Answer: 4.91 kJ

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

[tex]Q=m\times c_l\times (T_(f,l)-T_(i,l))+m\imes L+m\times c_v\times T_(f,v)-T_(i,v)[/tex]

Q = Heat absorbed = ?

m= mass of mercury = 48.5 g  = 0.0485 kg

c = specific heat capacity = [tex]0.14kJ/kgK[/tex]

L = heat of vaporization = 59.2 kJ

Initial temperature of liquid mercury = [tex]T_i[/tex] = 400 K

Final temperature of mercury vapor = [tex]T_f[/tex]  = 700 K

Putting in the values, we get:

[tex]Q=0.0485\times 0.14\times (629.88-400)+0.0485\times 59.2+0.0485\times 0.14\times (700-629.88)[/tex]

[tex]Q=1.56+2.87+0.476[/tex]

[tex]Q=4.91kJ[/tex]

Answer:

16.2 kj

Explanation:

1.56kj + 14.31kj + 0.34kj

It will take 15 s to travel 6 cm

Given

distance versus time graph

Required

time travel

Solution

Caterpillar motion is a straight motion with a constant speed, so that the graph between distance and time forms a diagonal line

If we look at the graph, we can determine the time taken when the distance reaches 6 cm (y axis) by drawing a line to the diagonal line and cutting the x-axis as time, and we get 15 s

Or we can also use the formula for motion at constant speed:

d = v x t

With v at point 2,5 of 2/5 m / s, so the time taken:

[tex]\tt t=\dfrac{d}{v}=\dfrac{6}{2/5}=15~s[/tex]

Answer:

45.165  ×  10²³ molecules

Explanation:

Given data:

Number of moles of SO₂ = 7.50 mol

Number of molecules = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

7.50 mol  ×  6.022 × 10²³ molecules

45.165  ×  10²³ molecules

Answer:

[tex]\boxed {\boxed {\sf 0.3375 \ mol \ NaCl}}[/tex]

Explanation:

Molarity is found by dividing the moles of solute by liters of solution.

[tex]M=\frac{moles \ of \ solute }{liters \ of \ solution}[/tex]

We know the molarity is 0.45 M and there are 0.750 liters of solution. The solute is NaCl (sodium chloride). We can substitute the values into the formula.

[tex]0.45 \ M = \frac{ moles \ of \ NaCl}{ 0.750 \ L }[/tex]

The molarity (M) can also be represented by mol/L

[tex]0.45 \ mol/L = \frac{ moles \ of \ NaCl}{ 0.750 \ L }[/tex]

We are solving for the moles of solute, so we must isolate the numerator. It is being divided by 0.750 liters. The inverse operation is multiplication, so multiply both sides of the equation by 0.750 L.

[tex]0.750 \ L * 0.45 \ mol/L = \frac{ moles \ of \ NaCl}{ 0.750 \ L }*0.750 \ L[/tex]

The liters will cancel out.

[tex]0.750 * 0.45 \ mol = { moles \ of \ NaCl}[/tex]

[tex]0.3375 \ mol \ = moles \ of NaCl[/tex]

There are 0.3375 moles of NaCl in a 0.750 liter solution with a molarity of 0.45 M.

Answer: Magnesium turns red litmus blue and sulphur turns blue litmus red.

Explanation:

When a metal reacts with oxygen present in air, it forms basic oxide which simply means when they react with water, they form basic solution.

The chemical equation for the burning of magnesium (metal) in air and reaction with water of the product so formed are as follows:

[tex]2Mg+O_2\rightarrow 2MgO[/tex]

[tex]MgO+H_2O\rightarrow Mg(OH)_2\text{ (base)}[/tex]

When a non- metal reacts with oxygen present in air, it forms acidic oxide which simply means when they react with water, they form acidic solution.

The chemical equation for the burning of sulphur (non-metal) in air and reaction with water of the product so formed are as follows:

[tex]S+O_2\rightarrow SO_2[/tex]

[tex]SO_2+H_2O\rightarrow H_2SO_3\text{ (acid)}[/tex]

There are 2 types of litmus:

Therefore, here, magnesium forms a basic solution, therefore it will turn red litmus blue whereas sulphur forms an acidic solution, so it will turn blue litmus red.

Answer:N

2

+ 3

H

2

-----> 2N

H

3

Explanation:

N

2

+

H

2

-----> N

H

3

Let us balance this equation by counting the number of atoms on both sides of the arrow.

N

2

+

H

2

-----> N

H

3

N=2 , H=2 N=1, H=3

To balance the number of N atom on Right Hand Side (RHS) , I will add one molecule of N

H

3

on RHS

N

2

+

H

2

-----> 2N

H

3

N=2 , H=2 N=2 , H= 6

To balance the number of H atoms on Left Hand Side (LHS) , I will add two molecules of

H

2

on LHS

N

2

+ 3

H

2

-----> 2N

H

3

N=2 , H=6 N=2 , H= 6

Answer link

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Answer:

you said brainliest

Explanation:

Given

80% 127I, 17% 126I, and 3% 128I.

Required

The average atomic mass

Solution

The elements in nature have several types of isotopes

Atomic mass is the average atomic mass of all its isotopes

Mass atom X = mass isotope 1 . % + mass isotope 2.% + ... mass isotope n.%

Atomic mass of Iodine = 0.8 x 127 + 0.17 x 126 + 0.03 x 128

Atomic mass of Iodine = 101.6 + 21.42 + 3.84

Atomic mass of Iodine = 126.86 amu

Answer:

D. j.j thomson is the correct answer

Explanation:

just answered a similar question

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{3.0 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.049833...[/tex]

We have the final answer as

Hope this helps you

Answer:

elliptical galaxy

Explanation

:The combination of the two galaxies then forms what appears to be an elliptical galaxy as the arms begin to disappear. The merger of gasses creates new stars, and the new shape becomes more elliptical, globular, or sometimes irregular.

Answer:

1

Explanation:

Octet meaning 8. So if chlorine already has 7 valence electrons it will only need to get 1 more to be satisfied.

Here ^ you have to tap to see the full pic. comment if u dont understand anything :)

Mass of copper produced = 5 g

The balanced chemical equation:

Zn + 2CuNO₃ → Zn(NO₃)₂ + 2Cu

Given:

0.037 moles of zinc and 0.11 moles of copper(I) nitrate

To find:

Mass of Cu  metal produced=?

The amount of CuNO₃  produced =0.11/2=0.055moles

Thus, amount of copper=0.037*2= 0.0740 moles  

The mass of copper produced =0.0740*63.5=4.699g=5g

Therefore, the Mass of Cu produced will be 5 g.

Learn more:

brainly.com/question/13852350

Answer:

3

Explanation:

On the left side we have 3 Calcium atoms and 6 fluorine atoms

that means there need to be the same number on the right side

in the CaF2 molecules we already have 2 fluorine atoms so by multiplying with 3 we get 3 Ca and 6F

Answer:

No, the model does not demonstrate the conservation of matter

Explanation:

The principle of conservation of matter states that matter can neither be created nor destroyed but is transformed from one form to another.

If we look at the model presented, the products on the right hand side and the reactants on the left hand side, we will notice that there is a loss of matter from left to right.

As a result of this, the model does not show the principle of conservation of matter.

Balance the reaction of Fe2(SO4)3 + KOH = K2SO4 + Fe(OH)3 using this chemical equation balancer! ... Fe2(SO4)3 + 6KOH → 3K2SO4 + 2Fe(OH)3 ...

Missing: _K[ ‎| Must include: _K[

Answer:

Fe2(SO4)3 + 6 KOH → 2 Fe(OH)3 + 3K2SO4

Explanation: