Can somebody help me with this it is a science question part #2 ( can you also check my other questions to see if you can answer them).

Answer:

50%

Explanation:

% yields =(experimental yields / theoretical yields ) x100%

            =    122.1÷  245.6 ) x100% = 50%

Answer:

0.00050553

Explanation:

when the power of ten is negative, move the decimal to the left

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Answer:

The answer is B

The correct answer is option B: Mg with 14 neutrons

The mass spectrum shows the charge to mass ratio of atoms. I can be used to sort the isotopes of an element.

Isotopy is a phenomenon in which atoms of the same element have the same atomic number but different mass numbers.

The mass spectrum of atoms separates atoms on the basis of charge to mass ratio of the isotopes.

The isotopes of magnesium are;  24Mg atom which has 12 neutrons 25Mg which has 13 neutrons, and  26Mg which has 14 neutrons.

Hence, the peak at 26amu represents 26Mg which has 14 neutrons.

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Answer:

5.232

Explanation:

Answer:

A. A liquid is changing to a solid

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Answer:

Example of the matter is ball and example of energy conservation is switching off the light.

Explanation:

The matter refers to anything that has mass, occupies some space, and has some volume. Therefore, the example of the matter is a ball, here we can see that ball occupies some space and it has volume as well as mass.

Moreover, the example of energy conservation is switching off the light when there is no use of lights. Switching off the light will conserve the consumption of energy.

Answer:

"Water can produce electricity. Water falls from the sky converting potential energy to kinetic energy"

Answer:

A.. 0.1 gram this means 0.0001kg of the object in SI unit

b. 0.01 meter this means 1 / 10 of 1 meter of the measurement

c. 0.000001 liter this means 1/10000 of the quality of liquid in SI unit

e. 1000 000 grams.this means 1000kg of the object in IS unit

L. 10 meters this means 10 times one meter of the measurement in SI unit

Answer:

It is not a gas because its particles do not have large space between them.

The substance should be

It is not a gas because its particles do not have large space between them.

The following information should be considered;

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Answer:

Its true

Explanation:

Answer:

it is TRUE on edge

Explanation:

Answer:.1 kJ = 1000 J  and 1J=0.24cal

----->78.9kJ=1000x78.9x0.24=18936cal

Explanation:

This is the unit regulated by the scientific community and they follow the formula that they prove

Answer:

______is used in production of hard disk.

Explanation:

Answer:

The Flow of science keeps going because not everything is fully discovered yet. New things are discovered everyday and are also made better as well.

Explanation:

Answer:

Because the atmospheric pressure at higher altitudes is lower than at sea level.

Water, or any liquid for that matter, boils when its vapor pressure equals the external pressure above the liquid.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 2000 mL

density = 1.05 g/mL

The mass of soda is

mass = 2000 × 1.05

We have the final answer as

Hope this helps you

Answer:

The spine is also designed to protect your spinal cord. The spinal cord is a column of nerves that connects your brain with the rest of your body, allowing you to control your movements. Without a spinal cord, you could not move any part of your body, and your organs could not function.

Answer:

The number of   milliliters  of  isopropyl alcohol that are  in   a 400 ml bottle  of this solution  is 280 Ml

Explanation:

% V/V =  volume of  solute/ volume  of  solution  x 100

Let the volume  of solute  be =  y  ml

the volume  of  solution =  400 ml

convert 70%  to fraction = 70/100

by  substituting  the value  in the equation

= y  ml/  400 ml =  70/100

by cross  multiplication

100y =400 x70

100y=  28000

y= 280 ml

The best statement among the following which explains whether alchemy is a science or pseudoscience is "It is pseudoscience because each metal is known to be a unique element." Hence, Option (D) is correct.

Alchemy began to fully evolve into chemistry in the 17th century, with a greater emphasis on rational thought and experimentation and less emphasis on spirituality and mysticism.

The alchemists were never successful in changing lead into gold, but modern nuclear physics can accomplish this task.

Therefore , The best statement among the following which explains whether alchemy is a science or pseudoscience is "It is pseudoscience because each metal is known to be a unique element." Hence, Option (D) is correct.

Learn more about Alchemy here ;

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Answer:

i don't now

Explanation:

B-)o:-)(^^)(^^)❌❌✴️

Answer:

carbon dioxide, CO2

dihydrogen monoxide, H2O

sodium chloride, NaCl2

The three chemical compounds used in the daily life are carbon dioxide (CO2), ammonia (NH3), and water (H2O).

Chemical symbols are acronyms for chemical elements, functional groups, and chemical substances that are used in chemistry.

Chemical element symbols are typically composed of one or two letters from the Latin alphabet, with the first letter capitalized.

A chemical symbol, also known as an element symbol, is a letter or a combination of letters that represents a chemical element.

Because it is shorter and easier to write, the chemical symbol for an element is used when writing the chemical formula for a molecule or when writing a chemical equation.

Carbon dioxide (CO2), ammonia (NH3), and water are the three chemical compounds encountered in daily life (H2O).

Thus, these are some of the examples of chemical compounds.

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Answer:

56.69905

Explanation:

The conversion factor from pounds to kilograms is 0.45359237, which means that 1 pound is equal to 0.45359237 kilograms.

Answer:

Seismology

Explanation:

Seismology is scientific discipline that is concerned with the study of earthquakes and of the propagation of seismic waves within the Earth. A branch of geophysics, it has provided much information about the composition and state of the planet's interior.

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Answer:

the correct answer is

Empirical evidence is the information received by means of the senses, particularly by observation and documentation of patterns and behavior through experimentation. The term comes from the Greek word for experience,

Explanation:

hope this helps you!!

Answer: were used to bombard metal thin foil

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Answer:

Hey there!

Quantitative measurements have data and statistics. For example, the liquid has a temperature of 55.6 degrees C is a quantitative measurement.

Let me know if this helps :)

Answer:

0.3382 kg

Explanation:

From the illustration:

100g of the ore would contain 20.7 g of nickel by mass. In order to obtain 70.0 g of nickel, the amount of the ore needed would be:

          100 x 70.0/20.7 = 338.16 g

According to conversion units:

1 g = 0.001 kg

Hence,

338.16 g = 338.16 x 0.001 = 0.3382 kg

Therefore, 0.3382 kg of the ore would be required in order to obtain 70.0 g of nickel.

Amount of core in Kilogram is 0.338 kg (Approx.)

Percentage in every ore = 20.7%

Amount of nickel = 70 gram

Amount of core in Kilogram

Amount of core in Kilogram = Amount of nickel / Percentage in every ore

Amount of core in Kilogram = 70 / 20.7%

Amount of core in Kilogram = 70 / 0.207

Amount of core in Kilogram = 338.16 gram

Amount of core in Kilogram = 0.338 kg (Approx.)

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Answer:

air, water, sunlight

Explanation:

A limiting factor may be defined as a environmental condition or a resource that can limit the plant growth as well as distribution or the abundance of an organism or its population within the ecosystem. The ability  of any plant species to grow and spread throughout any geographic area is the direct result of the adaption to its biotic  and abiotic components of that region.

Some of the factor that affect the plant growth are : sunlight, air, proper temperature, moisture, nutrients, wind,etc.

The lack of the any one of the above essential component will determine the health of the  plant.

Answer:

Chemical Change

Explanation:

It became white and became solid which makes it a chemical change.