Data
Record your data either in your lab notebook or in the space below.
Time
Radioactive Atoms
0.5"
Half-Life
Minutes
Predicted
Simulated
Cycles, n
Acted out
0.0
100
Initial = 0
100
1
100
0.5
1
2.
1.0
1.5
3
2.0
4
2.5
5
3.0
6
3.5
7
4.0
8
id

Answer:

electron in physics , and Element in chemistry.

Answer:

B. Protons

Explanation:

The atomic number or proton number of a chemical element is the number of protons found in the nucleus of every atom of that element.

Answer:

protons

Explanation:

Answer:

Explanation:

I believe u should use a thermometer coz its better and u will be able to find the temperature more accurately!!

Answer:

planet A

Explanation:

because it doesn’t have to go as far when it orbits

Answer:

I believe it is an Alkane

Explanation:

Answer:

beta plus

Explanation:

edg

Answer:

beta plus

Explanation:

edge

Answer:

2nd option

Explanation:

Answer:

The answer is 0.046 mol.

Explanation:

By looking at the balanced equation, you can form a ratio of lithium chloride and lithium bromide using the coefficient value :

ratio of lithium bromide (2LiBr)

= 2

ratio of lithium chloride (2LiCl)

= 2

So the ratio is 2 : 2 then simplify into 1 : 1 . Which means that 1 mol of lithium bromide is equal to 1 mole of lithium chloride.

In this case, 0.046 mol of lithium bromide will form 0.046 mol of lithium chloride.

The number of moles should be 0.046 mol.

Here we can create a ratio of lithium chloride and lithium bromide by applying the coefficient value :

the ratio of lithium bromide (2LiBr) = 2

And, the ratio of lithium chloride (2LiCl) = 2

Here 2:2 means 1:1

So, the number of moles should be the same i.e. 0.046 mol.

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Answer:

So 1 mole

Explanation:

PV = nRT

P = Pressure atm

V = Volume L

n = Moles

R = 0.08206 L·atm·mol−1·K−1.

T = Temperature K

standard temperature = 273K

standard pressure = 1 atm

22.4 liters of oxygen

Ok so we have

V = 22.4

P = 1 atm

PV = nRT

n = PV/RT

n = 22.4/(0.08206 x 273)

n  = 22.4/22.40

n = 1 mole

Answer:

A. the ration is 2 to 3, 2Al + 3H2SO4 has the same balance as 18Al + 3H2SO4

2/3 = 18/27

B. Doesn't need an explanation other than the work you did to balance it.

The moles of sulfuric acid reacted with the reaction has been 27 moles. The moles of hydrogen produce is 27 mol, and aluminum sulfate is 9 mol.

The moles of reactant reacted in the reaction, and the moles of product produced, can be given by the stoichiometric law.

According to the stoichiometric law, the moles of product produces, and the reactant reacted is given by the stoichiometric coefficient.

[tex]\rm 2\; mol\;Al=3\;mol\;H_2SO_4\\\\18\;mol\;Al=\dfrac{3}{2}\;\times\;18\;mol\;H_2SO_4\\\\ 18\;mol\;Al\;=27\;mol\;H_2SO_4[/tex]

Thus, the moles of sulfuric acid reacted in the reaction are 27 moles.

[tex]\rm 2\;mol\;Al=1\;mol\;Al_2(SO_4)_3\\\\18\;mol\;Al=\dfrac{1}{2}\;\times\;18\;mol\;Al_2(SO_4)_3\\\\ 18\;mol\;Al=9\;mol\;Al_2(SO_4)_3[/tex]

The moles of aluminum sulfate produced in the reaction are 9 moles.

The moles of hydrogen produced from 2 moles of Al are 3 moles. the moles of hydrogen produced from 18 mol Al has been:

[tex]\rm 2\; mol\;Al=3\;mol\;H_2\\\\18\;mol\;Al=\dfrac{3}{2}\;\times\;18\;mol\;H_2\\\\ 18\;mol\;Al\;=27\;mol\;H_2[/tex]

The moles of hydrogen produced in the reaction are 27 moles.

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Answer:

[tex]Q=-76.7kJ[/tex]

Explanation:

Hello,

In this case, for such formation of sulfur hexafluoride, the standard enthalpy of formation is -1220.47 kJ/mol (data extracted from NIST database). Next, we compute the moles in 10.0 grams of sulfur hexafluoride as shown below:

[tex]n_{SF_6}=10.0gSF_6*\frac{1molSF_6}{146.06 gSF_6}=0.0685mol[/tex]

Next, for the given energy, we compute the total heat that is liberated:

[tex]Q=-1220.47\frac{kJ}{mol}*0.0685 mol\\\\Q=-76.7kJ[/tex]

Finally, we conclude such symbol has sense since negative heat is related with liberated heat.

Best regards.

Answer:

83.5 kJ

Explanation:

Molar mass is 146.053. Moles of 10.0 g = 0.0685 mol. Multiply by 1220 kJ/mol for the answer of 83.5 kJ.

Answer:

Butanoic acid

Explanation:

Answer:

Here's a quick conversion before I answer your question, use it whenever needed.

1 moles Copper to grams = 63.546 grams. 2 moles Copper to grams = 127.092 grams. 3 moles Copper to grams = 190.638 grams. 4 moles Copper to grams = 254.184 grams. 5 moles Copper to grams = 317.73 grams. 6 moles Copper to grams = 381.276 grams. 7 moles Copper to grams = 444.822 grams.

Ok, now I'll answer your question.

Atomic masses are given in atomic mass units. One atomic mass unit is equal to one gram per mole. When you add these together for a compound, you get the molar mass of that compound. For example, silicon dioxide consists of one silicon atom and two oxygen atoms. The atomic mass of silicon is 28 grams and the atomic mass of oxygen is 16 grams.

(Hope the conversion and the answer helped) Sky

Answer:

Scale Factor: 1 : 2

X = 11

Explanation:

3 / 3 = 1

6 / 3 = 2

The scale factor should be 1:2

So 'X' should be 11 since 5.5 * 2 = 11

Answer:

1) 94.0° C, 2) 34.7°C

Explanation:

1)

Q=mcΔt° =mc(t2 - t1)

2350 J = 85.0 g* 0.385 J/(g*°C) *(t2 - 22.2°C)

t2 - 22.2°C = 71.81°C

t2 = 94.0° C

2)

Q=mcΔt° =mc(t2 - t1)

- 2070 J = 75.0 g * 0.903 J/(g*°C) *(t2 -65.3°C)

t2 - 65.3°C =  - 30.56°C

t2 = 34.7°C

Answer:

I think it would be Scientific Method.

Answer:

0.134 moles

Explanation:

In order to solve this, we need to find the molar mass of Chromium, which we can see from the periodic table: it is 51.996 g/mol.

Now, we need to set up an equation to convert grams to moles:

[tex]6.97 grams*\frac{1mol}{51.996grams} =0.134mol[/tex]

Thus, the answer is 0.134 moles of Chromium.

Explanation:

Step 1:  Find how many moles

Formula → [tex]grams*\frac{1 mol}{51.996grams}[/tex]

[tex]6.97 g *\frac{1 mol}{51.996g}[/tex] ← The g's cancel and there is only moles left on top

[tex]0.13405... mol[/tex]

Answer:  Rounded - 0.13405 moles of Chromium

Answer:

The correct answer is B . Na2CO3(aq) + CaCl2(aq) → 2NaCl(aq) + CaCO3(s)

Explanation:

hope it works out !!

A double replacement reaction is Na2CO3(aq) + CaCl2(aq) → 2NaCl(aq) + CaCO3(s). Therefore, option B is correct.

When pieces of two ionic compounds are exchanged, two new compounds are created. These reactions are known as double replacement reactions, double displacement reactions, exchange reactions, or metathesis reactions.

We need to understand the types of ionic compounds that create precipitates in order to determine whether double-replacement reactions will take place. In order to do this, we employ solubility principles, which are broad generalizations that foretell which ionic compounds will dissolve (be soluble) and which will not (are not soluble or insoluble).

A double displacement reaction is a particular type of reaction in which two reactants swap ions to produce two new molecules. Water-soluble ionic compounds interact with one another in a number of double displacement processes.

Thus, option B is correct.

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Answer:

Because if it didn't have structure then your body would fall apart

Explanation:

If you didn't have a spine you couldn't stand up straight

Hello there!

Question: Which process releases heat?

Explanation: The process the releases heat is called the exothermic process while the process is which heat is absorbed or taken is is called the endothermic process. The answer choices are examples of either endothermic or exothermic processes.

Answer Choices:

A. Grilling Vegetables

B. Frying an egg

C. Boiling water

D. Setting off a firecracker

Correct Answer:

D. Setting off a firecracker

Reasons:

A would not be correct since grilling vegetables is an endothermic process in which heat is being taken in to grill the vegetables.

B would not be correct since frying an egg is again taking in heat to fry the egg which is again, an endothermic process.

C would not be correct since boiling water is taking in heat to heat up the water which makes it endothermic process once again.

D would be correct since it is releasing heat when the explosion is triggered and you can feel the wave of heat afterwards.

P.S: These are all chemical reactions except for boiling water since that is a physical change.

Answer:

hydrogen

Explanation:

In the reaction between carbon dioxide and hydrogen gas, the species which oxidized is hydrogen. Hydrogen in this reaction oxidizes from 0 to +1 oxidation state.

Oxidation is the reaction with oxygen or loss of an electron in a reaction to form the upper oxidation states. The change in oxidation state depends on the number of electrons lost.

The given reaction is written as follows;

[tex]\rm H_{2} + CO_{2} \rightarrow CO+ H_{2}O[/tex]

In this reaction, one mole of hydrogen gas reacts with one mole of carbon dioxide giving carbon monoxide and water.

In H₂ state, hydrogen is in zero oxidation state. But in water, H is in +1 oxidation state.  In carbon dioxide, carbon is in +4 oxidation state and in CO it has +2. Hence, the oxidized species is hydrogen.

Find more on oxidation:

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Answer:

1.555 moles

Explanation:

Mass of sulfuric acid is 98.079g/mol

One liter of 0.954 solution has 0.954 mols

1.63 liters will have 0.954x1.63 = 1.555moles

Answer:

a light year is the distance light travels in one year. 6 trillion miles!!

Explanation:

Answer: electrical energy

Heat

electric current

Explanation:

In your common lightbulb you will transform electrical energy into two main forms of energy coming off of the lightbulb. Heat: from the filament of the bulb because you are running an electrical current through the filament. The heat is so immense that it forms our second form of energy, which is light!

Answer:b

Explanation:c

Answer:

The new volume of the balloon be [tex]462\ cm^3[/tex].

Explanation:

We have,

Initial volume is 556 cm ³

The temperature of the balloon decreases from 278 K to 231 K.

We need to find the new volume of the balloon if the pressure is constant.

The Charles law states that at constant pressure, the volume of gas is directly proportional to its temperature i.e.

[tex]V\propto T[/tex], P is constant

[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}[/tex]

[tex]V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{556\times 231}{278}\\\\V_2=462\ cm^3[/tex]

So, the new volume of the balloon be [tex]462\ cm^3[/tex].