Hi! I need help on 1-4 ASAP! Thanks!​

The correct answer to this open question is the following.

Two examples of how engineers use their knowledge of atoms to create new technologies would be the following.

1.- Engineers can develop new medicines for chronic diseases when they use their knowledge about atoms. With new technologies and different scientific approaches, this new molecular medicine can be more effective in the treatment of terrible diseases that affect humans. The challenge lies in how to make these new medicines more affordable to all kinds of people, not only rich people.

2.- Engineers can also apply their knowledge about atoms to improve the water conditions so more people can have freshwater. Engineers that specialize in the environment can research the properties of water molecules and atoms, so they can develop new ways to purify and improve the quality of water, that we know that water scarcity is a major problem in many parts of the world.

Answer:

Option C

Objective

Explanation:

When dealing with the study of natural phenomena, a purely objective approach must be made by scientists. This is because natural phenomena exist, devoid of human feelings or emotions. There is no room for subjectivity as the natural occurrences do not vary based on human thoughts and perceptions; rather they exist on their own.

Therefore, every evidence collected by scientists should be objective and analysis should be made based on characteristics displayed and not from their previous experiences or personal point of view.

If a lab experiment is not completed, the appropriate course of action would be to discuss the issue with your instructor. The correct option is A.

They may provide guidance on how to proceed, such as rescheduling the experiment or offering an alternative solution. By discussing the issue with your instructor, you can ensure that you follow the appropriate steps to resolve the situation and avoid any potential negative consequences.

Sneaking in after school and working alone (option B) is not a recommended solution, as it is important to follow proper procedures and protocols when conducting experiments.

Coming in during lunch and finishing the experiment while eating lunch (option C) is also not a suitable solution.

Making up some result (option D) is not an appropriate action to take. Falsifying data is unethical and goes against the principles of scientific integrity.

Thus, the correct option is A.

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Answer:

The molar mass and atomic mass are essentially the same for an element

Explanation:

The molar mass of a substance can be obtained by dividing the mass of the substance by the no of moles of the substance present.

The atomic mass of an element is the number of protons and neutrons present in the substance.

These two measurements usually give the same values because they both make reference to the 1/12th the mass of carbon-12  for their measurement.

Because they both have the same reference point, though they have different calculating procedures, the results obtained will be similar.

Answer:

The Celsius scale is in general use wherever metric units have become accepted, and it is used in scientific work everywhere. Kelvin temperature scale is the base unit of thermodynamic temperature measurement in the International System (SI) of measurement

Answer:

41.11 g of Ca(OH)2.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

CaO + H2O —> Ca(OH)2

Next, we shall determine the masses of CaO and H2O that reacted and the mass of Ca(OH)2 produced from the balanced equation. This can be obtained as follow:

Molar mass of CaO = 40 + 16 = 56 g/mol

Mass of CaO from the balanced equation = 1 × 56 = 56 g

Molar mass of H2O = (2x1) + 16

= 2 + 16

= 18 g/mol

Mass of H2O from the balanced equation = 1 × 18 = 18 g

Molar mass of Ca(OH)2 = 40 + 2(16 + 1)

= 40 + 2(17)

= 40 + 34

= 74 g/mol

Mass of Ca(OH)2 from the balanced equation = 1 × 74 = 74 g

From the balanced equation above,

56 g of CaO reacted with 18 g of H2O to produce 74 g of Ca(OH)2.

Finally, we obtained the mass of calcium hydroxide, Ca(OH)2 produced from the reaction of 33 g of CaO and 10 g of H2O. This can be obtained as follow:

From the question given above, we were told that when 33 g of CaO and 10 g of H2O reacted, 2 g of CaO were remaining. This implies that H2O is the limiting reactant and CaO is the excess reactant.

Thus, we shall use the limiting reactant to determine the mass of calcium hydroxide, Ca(OH)2 produced because it will give the maximum yield as all of it is consumed in the reaction.

The limiting reactant is H2O and the mass of calcium hydroxide, Ca(OH)2 produced can be obtained as follow:

From the balanced equation above,

18 g of H2O reacted to produce 74 g of Ca(OH)2.

Therefore, 10 g of H2O will react to produce = (10 × 74)/18 = 41.11 g of Ca(OH)2.

Therefore, 41.11 g of Ca(OH)2 were obtained from the reaction.

The air in the atmosphere consists of nitrogen, oxygen, which is the life-sustaining substance for animals and humans, carbon dioxide, water vapour and small amounts of other elements (argon, neon, etc.). Higher in the atmosphere air also contains ozone, helium and hydrogen

Answer:

b) Aluminum sphere: 11.4J

Silver sphere: 44.3 J

Explanation:

a) Mass of aluminum sphere

= 2.70(196)

= 529.20g

= 0.5292kg

Mass of silver sphere

= 10.49(196)

= 2056.04g

= 2.05604 kg

b) Work done (Joules)

= force (Newton) ×distance moved in the direction of the force (in meters)

[tex] \boxed{W = F \times d} [/tex]

To raise the sphere, the work done is against gravity.

For the formula for weight (or force of gravity), the mass needed is in kg, which we have already converted to in part (a).

Since they asked for the work done on each sphere, let's calculate the work done for the aluminium sphere first.

Aluminium sphere:

F= mg

F= 0.5292(9.8)

F= 5.18616N

W= Fd

Work done

= 5.18616(2.2)

= 11.4J (3 s.f.)

Silver sphere:

F= mg

F= 2.05604(9.8)

F= 20.149192N

W= Fd

Work done

= 20.149192(2.2)

= 44.3J (3 s.f.)

Answer:

This question is incomplete as it does not include the table. However, the functions of the systems on the table with their associated systems are;

- Releases hormones: Digestive and endocrine systems

- Supplies the body with oxygen: respiratory and circulatory systems

- Supplies the body with nutrients: digestive and circulatory systems

- Removes carbon dioxide: respiratory and circulatory systems

Explanation:

Endocrine system of the body constitutes endocrine glands that secrete hormones into the bloodstream. Example of endocrine glands are the adrenal gland, pituitary gland, hypothalamus, thyroid, ovaries etc. However, the PANCREAS, which is an organ in the digestive system is also an endocrine gland that secretes INSULIN and GLUCAGON hormones into the bloodstream. Hence, the endocrine and digestive systems releases hormones

The respiratory system comprises organs that regulate gas exchange in the body i.e. take in oxygen, take out carbon dioxide. However, the circulatory system, which comprises the arteries, veins, capillaries transports the oxygen throughout the body via the blood. The oxygen enters via the respiratory system and is circulated by the circulatory system.

Ingested food is broken down via the digestive system, which comprises of organs like small intestine, stomach, pancreas, large intestine, liver etc. The digested food releases nutrients into the bloodstream, which gets transported by the blood to other parts of the body. Hence, the circulatory and digestive systems play a part in supplying the body with nutrients.

Respiratory system via the process of gas exchange removes carbon dioxide from the body system. However, the carbon dioxide waste enters into the bloodstream (circulatory system) initially before getting transported to the lungs where the respiratory system takes over by exhalation

Answer:

I think it is the third option.

Explanation:

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[tex]\rm{\pink{\underline{\underline{\blue{TO\:FIND:-}}}}}[/tex]

[tex]\rm{\pink{\underline{\underline{\blue{SOLUTION:-}}}}}[/tex]

✍️ See the attachment diagram .

✯ Hence, Total displacement from town A to town B is “ 82km ” .

Answer:

displacement is the is shortest distance travelled by an object between the initial and final the position.

So, the displacement between towns A and town B is 82 km.

pls follow me!

Answer:

detectives, police officers and occasionaly lawyers/attorneys.

Explanation:

Non essential officers, judges, district attorney investigators, federal agents, victums, witnesses and politics are not permited to enter crime scenes unless they can provide information and history about the event.

Answer:

the molecules and atoms vibrate faster.

Explanation:

When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determine the state of matter of the substance. The result of increased molecular motion is that the object expands and takes up more space.

➡ this answer is based on my research. I hope it can help you

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Answer:

Chemical properties are very useful in identifying substances. However, unlike physical properties, chemical properties can only be observed as the substance is in the process of being changed into a different substance.

Explanation:

Answer:

1 Joule=0.2390057361 Calorie

789kj=789×0.2390057361×1000

=188575.5257829calorie

Explanation:

Hope u have understand

Answer:

The second one resprents a chemical change because a chemical change is when a new substances is combined with the other substances to form a new substances

Explanation:

The diagram with the orange and grey in the middle plus the orange and white that is what the other substance created.

Answer:

It is a nuclear reaction because the identity of elements changes when there is a change in the number of protons and neutrons.

Explanation:

Reaction X is a nuclear reaction because the identity of elements changes when there is a change in the number of protons and neutrons.

A chemical reactions involves the combination of two or more elements to form a compound. A nuclear reaction occurs when an element is transformed into another element.

Reaction X is a nuclear reaction. This is because, the identity of elements changes when there is a change in the number of protons and neutrons.

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Answer:

It was called The Step Reconer

stepped reckoner was invented by digital mechanical calculator

Answer: A rearrange and form new substances with new properties.

Explanation: Got it right on Edgenuity

Answer:

a

Explanation:

got it right

Answer:

It s A) only change the amount of lemonade mix you add, and B). only change the amount of water you add. I just did it

Answer:

It's the first two, only adding water and only adding lemonade mix, not both

Explanation:

Just got it right on Edge 2022

Answer:

two electrons

Explanation:

Since every electron has a single negative charge, the addition of two electrons results in an oxygen ion with a charge of - 2

Answer:

0.42g/cm³ or 420kg/m³

Explanation:

1cm³ = 1ml

10 × 1cm³ = 10cm³

Density = Mass ÷ Volume

4.2g ÷ 10cm = 0.42 g/cm³

Density = 0.42g/cm³ or 420kg/m³

Given :

Two chemicals [tex]Cu_2O(s)[/tex] and [tex]CuO(s)[/tex] .

To Find :

Are these substances same or different explain.

Solution :

It might seem that the difference is none because the atoms used in the molecules are same but in different proportion .

But , their is a lot of difference between them .

The change in configuration impacts a lot in physical as well as chemical properties .

For ex :

[tex]Cu_2O[/tex] is red powder while [tex]CuO[/tex] is black powder .

[tex]Cu_2O[/tex] is fungicide while [tex]CuO[/tex] is used in batteries .

Hence , this the required solution .

Answer:

[tex]147515[/tex]

no inglés sorry

Answer:

by addding up the the mass of protons and neutrons

Answer:

mixture can be separated into pure substances by simple distillation

A mixture can be separated into pure substances with the utilization of several techniques of physical methods like simple distillation, centrifugation, sedimentation, etc.

Simple distillation may be defined as a type of separation technique that involves the separation of solvent from a solution. This technique is utilized for purifying the liquids that comprise either nonvolatile impurities such as sand, salt, and other very small amounts of particles.

Apart from simple distillation, evaporation is also used to eliminate water or any liquid substance from a mixture. It makes the solution or mixture dry with the absolute absence of water.

The Centrifugation technique is used to separate the particles on the basis of their size, shape, density, viscosity, and rotor speed.

Therefore, with the utilization of separation techniques, one can easily separate a mixture into pure substances.

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Answer: An extensive property is a property that depends on the amount of matter in a sample. Mass and volume are examples of extensive properties. ... Color, temperature, and solubility are examples of intensive properties.

Explanation:

An intensive property of iron is density while an extensive property of iron is mass.

WHAT ARE INTENSIVE AND EXTENSIVE PROPERTIES?

Regarding iron as an element, one intensive property it posseses is density while one extensive property is its mass.

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Answer:

C, because matter can not be created or destroyed.

Explanation:

Hey there!

I believe your answer woukd be "The amount of matter stays same as water changes state."

Hope this helps!

Have a great day!

Answer:

7

Explanation:

Answer:

7

Explanation:

The significant figures are: 1,0,0,0,0,2,1

Remember the rules is

1. Non-digits are always significant.

2. Any zeros between two significant digits are significant.

3. A final zero or trailing zeros in the decimal portion only are significant

Those are three rules you have to follow in order to see how many significant figures there are in 10,000,210.

So I’m guessing 7 is the answer

Therefore the answer is 7.

Hope this helps! :)

Brainliest would be highly appreciated! Thanks! :)