A person's _____ changes as he travels from the earth to space, but his _____ remains the same. mass, weight weight, mass mass, height height, weight

1. Questions that can be answered using science include:

- Does water exist on Venus?

- Should the use of automobiles be stopped?

2. Based on scientific knowledge, the most favorable day for Sarah to go on an outing would be Wednesday, as the air pressure started rising on the fourth day, indicating improving weather conditions.

3. Questions that can be answered using scientific methods include:

- What would be the effect of a hurricane?

4. Predictions about the future based on the lines on the palm of the hand is an example of pseudoscience.

5. The idea that Earth is becoming warmer will become unacceptable over time if scientific evidence supports a new idea.

6. Science helps society by helping society take reasonable decisions.

7. A theory is accepted by scientists when it is supported by adequate data.

The next step for the scientist who discovered a new theory on the evolution of the universe would be to inform the scientific community so they can verify the results.

8. A model of a widely accepted theory about the position of planets and sun would most likely help the scientist to understand facts which cannot be easily observed.

thanks for asking this question.... it was my pleasure helping you...

Answer:

If 3.4 moles of carbon dioxide (CO2) form at the end of the reaction, 1.7 moles of oxygen gas (O2) and 3.4 moles of carbon monoxide (CO)  entered the reaction

Explanation:

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three. Remember that proportionality is a constant relationship or ratio between different magnitudes.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:

a ⇒ b

c ⇒ x

So

[tex]x=\frac{c*b}{a}[/tex]

In this case, it is possible to use the reaction stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction) and the rule of three to calculate the quantities of moles requested:

[tex]molesofO2=\frac{3.4*1}{2}[/tex]

moles of O₂=1.7 moles

[tex]molesofCO=\frac{3.4*2}{2}[/tex]

moles of CO=3.4

If 3.4 moles of carbon dioxide (CO2) form at the end of the reaction, 1.7 moles of oxygen gas (O2) and 3.4 moles of carbon monoxide (CO)  entered the reaction

The  solution will be 0.27M hydrochloric acid

By using the combined gas law, we can determine that the volume of the gas under standard conditions of temperature and pressure (STP) would be approximately 242 mL.

The solution to this question can be found by using the combined gas law which connects the variables of pressure, volume and temperature. The combined gas law is typically written as P1V1/T1 = P2V2/T2 where P is pressure, V is volume and T is temperature. P1, V1, and T1 are the initial pressure, volume and temperature, and P2, V2, and T2 are the final pressure, volume and temperature.

In this case, we know the initial volume (V1) as 260 mL, the initial temperature (T1) as 21 degrees Celsius which converts to 294.15 K, and the initial pressure (P1) as 101.3 kPa. At STP, the final pressure (P2) is 101.325 kPa and the final temperature (T2) is 273.15 K.

Inputting these values into the combined gas law formula, we get: (101.3 kPa * 260 mL) / 294.15 K = (101.325 kPa * V2) / 273.15 K. Upon solving this equation, we find that under standard conditions of temperature and pressure (STP), the volume (V2) is approximately 242 mL.

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Answer:

A) 1.68 x 10²⁸ Cu atoms.

Explanation:

∵ The mass of Cu in the chalcopyrite ore = mass of the ore x weight fraction of Cu.

∴ The mass of Cu in the chalcopyrite ore = mass of the ore x weight fraction of Cu = (5.11 x 10³ kg)(0.3463) = 1.77 x 10³ kg.

n of Cu = mass/atomic mass of Cu = (1770 x 10³ g) / (63.54 g/mol) = 27.853 x 10³ mol.

∴ 27.853 x 10³ mol of Cu contains = (27.853 x 10³ mol)(6.022 x 10²³) = 1.677 x 10²⁸ Cu atoms ≅ 1.68 x 10²⁸ Cu atoms.

1. a

2. d

3. d

4. c

5. a

6. a

Answer:

A.solids

D.Both water and oil are not minerals because they are liquids

D.copper

C.Put an arrow labeled heat and pressure, pointing from igneous rocks to metamorphic rocks.

A..cooling of magma

A.sample containing 30 percent sand, 35 percent clay, and 35 percent silt

Final answer:

Dividing a large piece of iron into smaller pieces increases the reaction rate with an acid due to an increase in surface area, allowing for more frequent and effective collisions between reactant particles.

Explanation:

If a large piece of iron is finely divided into smaller pieces before reacting with an acid, the rate of the reaction would increase. This is because a finely divided solid has more surface area available for reaction than one large piece of the same substance. As reactions occur at the boundary between two phases, a larger surface area means more opportunities for the reactants to collide and react. For example, iron powder reacts more rapidly with dilute hydrochloric acid than a large iron nail because the powder has a greater exposed surface area, leading to more rapid production of hydrogen gas.

I got a different answer.

One

The molar mass of aluminum from the periodic table is 27

moles = given mass / molar mass

moles = 10 / 27

moles = 0.3704

Two

75 mL * [1 L / 1000 mL] = 0.075 mL

Concentration = 2M = 2 moles / L

Concentration = moles / Volume

2 = moles / 0.075 L        Multiply both sides by 0.075

2*0.075 = moles

0.150 moles

Three

Balance Equation: 2Al(s)+ 3CuSO₄ --> Al_2(SO₄)₃ + 3Cu   Note the formula for Al_2 (SO_4)_3

2 Al / 0.3704 moles = 3Cu / x     Substitute

2 / 0.3704 = 3/x                            Cross Multiply

2x = 0.3704 * 3

2x = 1.111                                         Divide by 2

x = 1.111/2

x = 0.555555 moles. of Copper

Four

moles = given mass / molar mass

molar mass Cu = 63.5

moles = 0.555

given mass = moles * molar mass

given mass = 35.28

Answer would be C, Physical Change, it's similar to crumpling up a piece of paper

physical change is the answer

I think that the answer would be 12

Two moles of nitric acid can be used to produce one mole of water.

A mole can be described as an international scientific standard unit that can be utilized to determine a given count of particles. The particles counted can be generally identical entities, individually distinct.

A mole can be used to determine a large number of quantities of atoms, molecules, ions, or subatomic particles. The amount of substance can be measured in terms of mole as elementary entities of a given substance in a sample.

The number of chemical entities present in 1 mole is equal to 6.023 × 10²³ is Avogadro’s constant.

Given, the reaction of the formation of water from nitric acid:

[tex]4HNO_3 \longrightarrow 4 NO_2 + 2 H_2O +O_2[/tex]

Given, the number of mol of water = 1 mol

2 mol of water is produced from  nitric acid = 4 mol

1 mol of water will be produced from nitric acid = (4/2) × 1 = 2 mol

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Using the equation we get something like this:

M = moles of solute/ liters of solution

But we need the number of moles of solute right? so we gotta arrange the equation to make it fit our needs.

M x liters of solution = moles of solute

M = mol/L

Liters of solution = L

moles of solute = mol

We have the M which stands for the molar mass in mol/L (0.4M)

And we also have the mL which are the liters of our solution, yet to be converted into liters. Let's divide them by a 1000 to make it into liters.

250mL / 1000 = 0.250L

Now we can multiply them! and find the number of moles of solute by replacing them, remember M can be changed into m/mol, because it's pretty much the same but written in another way.

0.4mol/L x 0.250L = 0.1 mol

The liters canceled, and we end up with mol. So, the answer is 0.1 mol.

Answer: 0.1 mol

Explanation: For gradpoint :)

Kb for ethylalamine = 5.6 x 10^-4.

pKb = -log( 5.6 x 10^-4.) = 3.25

pOH = 3.25 + log (0.295/0.325)

pOH = 3.207

14 -3.207 = 10.79 for Initial

lets see for final

0.325 * 0.28 = 0.091mol CH3CH2NH2

0.295 * 0.28 = 0.0826 mol CH3CH2NH3Cl

0.0826 - 0.005 = 0.0776mol CH3CH2NH3Cl

0.091 + 0.005 = 0.096 mol CH3CH2NH2

pOH = 3.25 + log(0.0776 / 0.096)

pOH = 3.157

pH =10.84 for final

1) Number of moles of product, carbon dioxide, is the same as that of vinegar. So the most efficient reaction is the one with the less amount of baking soda. So RXN 1 is the most efficient.

2) Number of moles of product, carbon dioxide, is the same as that of vinegar; except RXN 5. There is an error in the number of moles of carbon dioxide. It should be 0.05034.

Answer:

1) 1 is most efficient

Explanation:

efficiency is the ratio bet. reactants n products. adding vinegar n baking soda then dividing by co2, 1 gives the largest no.

2) 5 has different vinegar n co2 ratio - they are the same in the other 4. so for 5, the co2 should be 0.05034.

the answer to the question is b

Answer : The correct option is, (B) multiplying the equation first by 2.

Explanation :

The balanced final chemical reaction will be,

[tex]2Na_2O(s)+2Cl_2(g)\rightarrow 4NaCl(s)+O_2(g)[/tex]

The two intermediate chemical reaction are give :

(1) [tex]2Na(s)+Cl_2(g)\rightarrow 2NaCl(s)[/tex]

(2) [tex]2Na_2O(s)\rightarrow 4Na(s)+O_2(g)[/tex]

First multiplying the equation (1) by 2, we get

[tex]4Na(s)+2Cl_2(g)\rightarrow 4NaCl(s)[/tex]

Now adding both the equations, we get

[tex]2Na_2O(s)+4Na(s)+2Cl_2(g)\rightarrow 4Na(s)+O_2(g)+4NaCl(s)[/tex]

The final chemical reaction are :

[tex]2Na_2O(s)+2Cl_2(g)\rightarrow 4NaCl(s)+O_2(g)[/tex]

Hence, the correct option is, (B) multiplying the equation first by 2.

Answer:

Linear geometry

Explanation:

K2SO4 - KOH and H2SO4

NaBr - NaOH and HBr

Answer:

1)K2SO4 - B) KOH and H2SO4

2)NaBr - A) NaOH and HBr

.5 moles.... because 1mole has 6.022×10^23 particles

Answer:

.5

Explanation: just trust

50 ml es el resultado

To neutralize 12.2 mL of 0.25M HCl, approximately 12.7 mL of 0.12M Ba(OH)2 is required. The closest option provided is 13 mL, which is correct based on the stoichiometry of the reaction and the concentrations involved.

To determine the volume of 0.12M Ba(OH)2 needed to neutralize 12.2 mL of 0.25M HCl, we must first write out the balanced chemical equation for the reaction:

Ba(OH)2 (aq) + 2 HCl (aq) → BaCl2 (aq) + 2 H2O (l)

From the equation, we see that one mole of Ba(OH)2 reacts with two moles of HCl. Next, we calculate the number of moles of HCl that will be neutralized:

Moles of HCl = Volume (L) × Concentration (M)

Moles of HCl = 0.0122 L × 0.25 M = 0.00305 mol

Based on the stoichiometry of the balanced equation, we need half the number of moles of Ba(OH)2 to neutralize the HCl.

Moles of Ba(OH)2 = 0.00305 mol HCl × (1 mol Ba(OH)2/2 mol HCl) = 0.001525 mol

Then, we calculate the volume of Ba(OH)2 solution:

Volume of Ba(OH)2 = Moles of Ba(OH)2/Concentration of Ba(OH)2

The volume of Ba(OH)2 = 0.001525 mol/0.12 M = 0.012708 L, which is approximately 12.7 mL.

Therefore, the volume of 0.12M Ba(OH)2 needed to neutralize 12.2 mL of 0.25M HCl is closest to 13 mL, which is one of the given options.

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