For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny silver colored strip of zinc metal in the solution and observed the changes, The student inferred that a chemical reaction occurred. What evidence supports this inference?

One of the most effective ways to reduce greenhouse gases is using a car powered by fuel cells.

The term greenhouse gases refers to those gases that lead to a rise in the temperature of the earth due to the re-radiation of infrared rays towards the surface of the earth.

It is very important to take vital steps in order to prevent the emission of these gases. One of the most effective ways to reduce greenhouse gases is using a car powered by fuel cells.

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Answer:

Using a car powered by fuel cells

Explanation:
B On Edge

Answer:

WTH? That is WOW....-_-

Answer:

wow

Explanation:

wow

Answer:

When an electron temporarily occupies an energy state greater than its ground state, it is in an excited state. An electron can become excited if it is given extra energy, such as if it absorbs a photon, or packet of light, or collides with a nearby atom or particle.

Explanation:

Hope this helps.

Have a good night ma´am/sir.

Be safe!

Answer:

216g H2O

Explanation:

H = 1

O = 16

H= 2 × 1 = 2

O= 1 × 16 = 16

16 + 2= 18g/mol

18g H2O = 1 mol

X g H2O = 12 mol

X × 1 = 18 × 12

X = 216 g/mol

The weight of 12.0 moles of water is determined as 216 g.

The weight of water is determined from the molecular weight of water. The molecular weight of water is given 18 g/mol.

The weight of 12 moles of water is calculated as follows;.

W = nM

W = 12mole x 18 g/mol

W = 216 g

Thus, the weight of 12.0 moles of water is determined as 216 g.

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Answer:

CO2

Explanation:

the subscript tells you how many of one element is used for this case there is one black atom and 2 red ones so you only need 1 carbon and 2 oxygens.

hope this helps. brainliest please?

Answer:

Test variable (independent variable): Predators, Pollution, Food.Outcome variable (dependent variable): Cricket Frogs.Control group: Beginning Frog Count

Explanation:

If pollution isincreased, then the cricket frog population will (stay the same) over the span offive years.If the amount of food available isincreased, then the cricket frog population will (increase) overthe span of five years.Procedure:The procedures are listed in your virtual lab. You do not need to repeat them here. Please be sureto identify the test variable (independent variable), outcome variable (dependent variable), andcontrol group for this experiment.

Answer:

45.0

Explanation:

Using the rules of rounding, we can round 44.981 to 45. We need that third sig fig though, so we add the trailing zero

The value 44.981 g to three significant figures is 45.0 g.

Significant figures, also known as significant digits, are the digits in a number that carries meaning in terms of precision and accuracy. They indicate the certainty or reliability of a measurement or calculated value.

To round the value 44.981 g to three significant figures, follow the rules for significant figures:

Identify the three most significant digits in the number. They are 4, 4, and 9.

Look at the digit immediately after the third significant digit. If it is 5 or greater, round up; if it is less than 5, round down.

In 44.981 g, the digit immediately after the third significant digit (9) is 8. Since 8 is greater than 5, round up.

Therefore, rounding 44.981 g to three significant figures gives us:

45.0 g.

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Answer:i believe 9-?

Explanation:

boron-10

boron-11

carbon-12

carbon-13

oxygen-16

oxygen-17

oxygen-18

chlorine-35

chlorine-37

Answer:

Sedimentary, igneous and metamorphic

Metomorphic, heat and pressure

Sedimentary erosion and weather

Igneous magma and lave

So three!

Answer:

We  have,

Initial volume is V  

1

​  

Initial temprature is T  

1

​  

=75  

0

C

Initial pressure is P  

1

​  

So, final temprature is T  

2

​  

=273+75=348K

V  

2

​  

=V  

1

​  

−  

100

15

​  

V  

1

​  

=  

100

85V  

1

​  

​  

Applying the gas formula,

T  

1

​  

P  

1

​  

V  

1

​  

​  

=  

T  

2

​  

P  

2

​  

V  

2

​  

​  

348

P  

1

​  

V  

1

​  

​  

=  

T  

2

​  

×100

2P  

1

​  

×85V  

1

​  

​  

T  

2

​  

=  

100

2×85×348

​  

T  

2

​  

=591.6K

Answer:

Temperature remains constant while all of a solid is converted to a liquid.

When a solid is converted to a liquid, heat is absorbed.

Explanation:

During a phase change, the temperature of the system remains constant. Recall that latent heat is defined as heat that causes a change of state without a corresponding rise in temperature of the system.

When a solid is converted to a liquid, latent heat of fusion is involved hence the temperature of the system remains constant throughout the process.

Similarly, heat is absorbed as intermolecular forces are broken up and the would converts to liquid.

Answer:

Irrational

Explanation:

:)

Answer:

It is irrational

Explanation:

Since 7 is a prime number, it has no square factors and its square root cannot be simplified.

Answer:

C) 2 H2(g) + O2 (g) 2 H2O (l) AH° = -571.6

kJ/mol

Explanation:

The magnitude of heat released in an exothermic reaction is shown by the magnitude of the change in enthalpy.

The more negative the enthalpy change of the reaction, the more the heat released by the process.

Hence,  2 H2(g) + O2 (g) 2 H2O (l) AH° = -571.6 kJ/mol has the most negative value of enthalpy change hence the greatest amount of heat is released in this reaction.

The reaction which would produce the largest amount of heat per mole of hydrogen is; Choice C: 2H2(g) + O2 (g). ===> 2 H2O (l) AH° = -571.6

AH° = -571.6kJ/mol.

According to the question;

It is evident that all the reactions are exothermic; the reactions release heat.

In this scenario; the reaction that would produce the largest amount of heat per mole of hydrogen is Choice C: 2H2(g) + O2 (g) =====> 2 H2O (l) AH° = -571.6 kJ/mol

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Answer : The net ionic equation will be,

[tex]3Sr^{2+}(aq)+2PO_4^{3-}(aq)\rightarrow Sr_3(PO_4)_2(s)[/tex]

Explanation :

In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

The given balanced ionic equation will be,

[tex]3Sr(OH)_2(aq)+2Li_3​PO_4(aq)\rightarrow 6LiOH(aq)+Sr_3(PO_4)_2(s)[/tex]

The ionic equation in separated aqueous solution will be,

[tex]3Sr^{2+}(aq)+6OH^{-}(aq)+6Li^{+}(aq)+2PO_4^{3-}(aq)\rightarrow Sr_3(PO_4)_2(s)+6Li^+(aq)+6OH^{-}(aq)[/tex]

In this equation, [tex]Li^+\text{ and }OH^-[/tex] are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

[tex]3Sr^{2+}(aq)+2PO_4^{3-}(aq)\rightarrow Sr_3(PO_4)_2(s)[/tex]

The complete ionic equation for the reaction between aqueous solutions of strontium hydroxide and lithium phosphate is:

3Sr²⁺(aq) + 6OH¯(aq) + 6Li⁺(aq) + 2PO₄³¯(aq) —> Sr₃(PO₄)₂(s) + 6Li⁺(aq) + 6OH¯(aq)

The complete ionic equation is simply an equation showing all available entities including the spectator ions present in the solution.

With the above information in mind, we shall write the complete ionic equation for reaction between aqueous solutions of strontium hydroxide and lithium phosphate. This can be obtained as follow:

In solution, strontium hydroxide, Sr(OH)₂ and lithium phosphate, Li₃PO₄ will dissociate as follow:

Sr(OH)₂(aq) —> Sr²⁺(aq) + 2OH¯(aq)

Li₃PO₄(aq) —> 3Li⁺(aq) + PO₄³¯(aq)

The reaction will proceed as follow:

Sr(OH)₂(aq) + Li₃PO₄(aq) —>

Sr²⁺(aq) + 2OH¯(aq) + 3Li⁺(aq) + PO₄³¯(aq) —> Sr₃(PO₄)₂(s) + 3Li⁺(aq) + 2OH¯(aq)

Balance the equation by writing 3 before Sr²⁺, 6 before OH¯, 6 before Li⁺ and 2 before PO₄³¯, to obtain the complete ionic equation as shown:

3Sr²⁺(aq) + 6OH¯(aq) + 6Li⁺(aq) + 2PO₄³¯(aq) —> Sr₃(PO₄)₂(s) + 6Li⁺(aq) + 6OH¯(aq)

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Answer:

I think its b

Explanation:

Answer:

4740460000, or 4.74046*10^9

Explanation:

This is math i thnk

e means *10

[tex]5.63\cdot \:8.42\cdot \:10^{19-11}[/tex]

[tex]5.63\cdot \:8.42\cdot \:10^8[/tex]

[tex]10^8\cdot \:47.4046[/tex]'

<3

Red

ok so this is saying

5.63 x 10^19 * 8.42 x 10^-11   indicates a scientific notation

plug into your graphing calculator and you get 4740460000 but make it imto three sig figs so the answer is: 4.74 x 10^9

Answer:

Explanation:

In order to find the volume , we use the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the final volume

[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]

From the question

P1 = 12 atm

V1 = 9 L

P2 = 6 atm

We have

[tex]V_2 = \frac{12 \times 9}{6} = \frac{108}{6} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

HNO₃ =63.0147 g/mol

CaCO₃ = 100.088 g/mol

Explanation:

Molecular mass:

It is the sum of all the atomic masses of the atoms of elements present in a molecule.

For example:

The formula of CaCO₃:

Calcium carbonate consist of one atom of calcium, one atom of carbon and three atoms of oxygen. Thus, its molecular mass would be,

CaCO₃ = 40.078 × 1 + 12.01×1 + 16.00×3

CaCO₃ = 40.078 + 12.01+ 48

CaCO₃ = 100.088 g/mol

The formula of HNO₃:

Nitric acid consist of one atom of hydrogen, one atom of nitrogen and three atoms of oxygen. Thus, its molecular mass would be,

HNO₃ =1.008 × 1 + 14.0067 ×1 + 16.00×3

HNO₃ = 1.008 +14.0067 + 48

HNO₃ =63.0147 g/mol

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 8.11 g

volume = final volume of water - initial volume of water

volume = 44.72 - 25.26 = 19.46 mL

We have

[tex]density = \frac{8.11}{19.46} \\ = 0.416752312...[/tex]

We have the final answer as

Hope this helps you

Answer:

200K

Explanation:

Pressure is directly proportional to temperature.

100=225

x=450

(100*450)/225=x

x=45000/225

x=200

Answer:

I dont lnow much about chemistry, but I believe it's either d or a. sorry if its wrong!

Answer:

120876

Explanation:

Answer: A

Explanation:

it had wings that flapped, similar to birds' wings.