Complete them with correct formulas
Then balance them

Answer:

by repeating the experiment

Explanation:

sometimes repeating the experiment with multiple trials can help make the experiment worth it

Answer:

∆H= 3.92 kJ

∆S= 2.54 J

Explanation:

Hope It helps

Answer:

none

Explanation:

It is given that there are 3 cats.

Each of the cats die with different diseases. One of cats died due to heart failure, the second cats died because of brain tumor and the third cat died due to an experiment gone wrong.

So there are none of the cats left out. All the cats died due to different reasons.

Answer:

Seattle is shielded from extreme weather by the Cascade and Olympic mountain regions to the east and west, respectively. Low pressure systems tend to come from the south while high pressure systems tend to come from the north.

Answer:

See Explanation

Explanation:

Renewable energy sources refers to those energy sources that can never be depleted. This means that they can be used severally without getting exhausted. Solar, biomass, wind and hydroelectric power are all renewable energy sources.

Hence, from the perspective described above, we can say that wind is a form of solar energy because wind is formed when the air is heated by the sun.

Hydroelectric power is driven by the water cycle. This water cycle somehow depends on the sun to run efficiently. So, hydroelectric power can also be considered to be a form of  solar energy.

Answer:

Al2(SO3)3 + 6NaOH → 3Na2SO3 + 2Al(OH)3

Answer:

Number 3 alkyne is the answer

Explanation:

Answer: The answer is Alkyne.

Answer:

C.same as [H+]

Explanation:

Autoionization of water is expressed as H+ * OH-  = Kc

The value of Kc is 1*10^-14. Now simply plug thus in and the value of given H+ to solve

(1*10^-7) * OH- = 1*10^-14

OH- = 1*10^-7

Thus, in this scenario, the H+ and OH- ions have same concentration and solution is said to be neutral.

Answer:

Answer here!

Explanation:

One controlled variable can be that they used the same setup, that is the constant between the two experiments. The manipulation was that Spallanzani used a flask without any air and a flask with air. The responding was or the dependent variable was to notice what had changed so in the experiment Spallanzani noticed that the flask with no air led to no microorganisms meaning that the theory of spontaneous generation is false.

The manipulated variable was the presence or absence of air in the flask. The responding variable was the growth of microorganisms in the broth. The controlled variable was the composition of the broth.

In Spallanzani's experiment, the manipulated variable refers to the factor that the scientist deliberately changes or manipulates. In this case, it was the presence or absence of air in the flasks. One flask had air sealed inside with the broth, while the other flask had no air present.

The responding variable is the factor that is observed or measured in response to the manipulated variable. In this experiment, the growth of microorganisms in the broth was the responding variable. Spallanzani checked for the presence or absence of microorganism growth in each flask.

The controlled variable is the factor that is kept constant or controlled throughout the experiment to ensure that it does not influence the results. In this case, the controlled variable was the composition of the broth used in both flasks. The broth composition was consistent, ensuring that any differences observed in microorganism growth could be attributed to the presence or absence of air.

To learn more about Spallanzani's experiment, here

https://brainly.com/question/33441903

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Answer:

amount of gas and pressure

Answer:

The correct answer is - B. New Moon.

Explanation:

The change of moon disc from all black to all light to all dark again is called the lunar cycle. It takes almost 30 days (29.53059 to be precise). The time from all black to all light or all light to all black is almost 15 days. All black moon is termed as the new moon and all light is termed as the full moon.

As given that the full moon is shown happening on the eleventh of the month then what moon would be around 25 which is 14 days later that should be in waxing gibbous phase and almost new moon.

Thus, the correct answer is - B. new moon.

Answer:

The answer is D, "sweat requires a lot of thermal energy to be absorbed to evaporate."

Explanation:

Like the other person, I just took the test.

An impact of the specific heat of water on the planet and the life forms in it is: D. sweat requires a lot of thermal energy to be absorbed to evaporate.

Thermal energy is also referred to as heat and it can be defined as a form of energy that is transferred from one physical object to another, especially due to a difference in temperature.

Generally, a lot of thermal energy is required to be absorbed for sweat to evaporate and this is mainly due to the impact of specific heat of water on the planet and all the life forms that are existing on it.

Read more on thermal energy here: brainly.com/question/12072129

Answer:

I think it can dissolve 80.0 grams

Answer:

8.31 KPa.L/Kmol

Explanation:

From the question given above, the following data were obtained:

Pressure = 101.3 KPa

Temperature (T) = 0 °C = 273 K

Number of mole (n) = 1 mole

Volume = 22.4 L

Gas constant (R) =?

The gas constant can be obtained as follow:

PV = nRT

101.3 × 22.4 = 1 × R × 273

2269.12 = R × 273

Divide both side by 273

R = 2269.12 / 273

R = 8.31 KPa.L/Kmol

Therefore, the value of the gas constant is 8.31 KPa.L/Kmol

Answer:

B. The reaction produce a gas as a product.

Explanation:

According to the law of conservation of mass, the total mass of reactants must be equal to the total mass of products because mass is neither created nor destroyed in a chemical reaction.

The total mass of the reactants is 7 grams. The total mass of the products and the beaker is 5 grams. This means that the mass of products is less than the mass of reactants.

The only plausible explanation for this is that the reaction produced a gaseous product which escaped because the system is an open system thereby leading to a  lesser measured mass of products since mass can not be created nor destroyed.

Answer:

3.01×10²³ atoms of calcium

Explanation:

number of moles = number of atoms/Avogadro's constant

n = N/NA

N = n×NA = 0.500 mol×6.02×10²³ mol^-1

N = 3.01×10²³ atoms of calcium

Answer:

Burning oil can pollute the air. Much of our oil has to be imported and it is becoming more and more expensive as reserves reduce and imports increase. Producing electricity from crude oil is expensive compared to other fossil fuels such as coal or gas.

Explanation:

Answer:

its actually experimental this time

Explanation:

sorry bout the last one i just wanna help:(

Answer:

Heat transfer by conduction

Answer:

There are 0.0305 calories in 0.128 joules

Explanation:

Given that,

Heat absorbed, Q = 0.128 J

We need to find the heat energy absorbed in calories.

We know that the relation between joules and calories is as follows :

1 calorie = 4.184 J

1 J = (1/4.184) J

So,

[tex]0.128\ J=\dfrac{0.128 }{4.184}\\\\=0.0305\ cal[/tex]

So, there are 0.0305 calories in 0.128 joules

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Answer:

the iupac name of CH3-CH2-CH2-OH Propanol.

Answer:

Extinct

Explanation:

Extinct volcanos are not expected to erupt, and have not erupted in a very long time.

Answer:

it's the last one.

Explanation:

a compound reaction that occurs when one element within a compound is exchanged with another element.

Answer:

1)more

2) increase

3)less

4)decrease

Explanation:

Oxidation can be regarded as process involving loss of electrons when a reaction is taking place by an atom or molecule, atom as well as ion. Oxidation do take place as when there is increase in oxidation state of a molecule as well as atom or ion. Reduction which is opposite process takes place as a result of gain in electrons, or when there is decrease in oxidation state of an atom as well as molecule, or ion. Oxidation number gives the the number which is been allocated to elements during a reaction of chemical combination. It gives the count of sharable electrons for an atoms or electron it can gain or loose as chemical bonding is taken place.

It should be noted Oxidation, or the loss of electrons, will result in an element becoming more positive. This element will show an increase in oxidation number. Reduction, the gain of electrons, will cause an element to become less positive and the element will show a decrease in oxidation number.

Answer:

7242.1g

Explanation:

The balanced equation for this reaction is as follows:

Mg + 2HCl → MgCl2 + H2

From the above equation, it can be observed that 2 moles of HCl is needed to produce 1 mole of H2.

Using the formula below, we convert the mass of H2 to moles;

Molar mass of H2 = 2.016g/mol

mole = 200/2.016

mole = 99.21mol of H2

Since 2 moles of HCl is needed to produce 1 mole of H2.

Then 99.21 moles of H2 will be produced by 99.21 × 2 = 198.4mol of HCl

Molar mass of HCl = 1 + 35.5

= 36.5g/mol

Mole = mass/molar mass

Mass = molar mass × mole

Mass = 36.5 × 198.4

Mass = 7242.1g