CHEMISTRY MIDDLE SCHOOL

What are the units for standard pressure?

Answers

Answer 1
Answer:

Answer:

The unit of pressure in the SI system is the pascal (Pa), defined as a force of one Newton per square meter. The conversion between atm, Pa, and torr is as follows: 1 atm = 101325 Pa = 760 torr. A standardized prefix system indicates fractions and multiples of metric units (e.g. milli-, mega-).
Answer 2
Answer:

Answer:

Pascals(Pa)

Explanation:

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What are two cells and how can we tell them apart

Answers

Animal cell- circle, has a larger vacuole
Plant cell- Cell wall, Chloraplast, Rectangle,

The atomic number of the sodium atom is 11. The atomic mass number can be estimated by rounding the atomic mass to 23. From this information, you can find the number of neutrons: 11 protons plus how many neutrons equals a mass number of 23? The number of neutrons would have to be the difference between 23 and 11, which is 12. This fact can be restated this way: 11 protons plus 12 neutrons equals a mass number of 23. For every proton in the nucleus, an electron revolves around the nucleus. Since 11 protons are in sodium, 11 electrons must be in sodium.The atomic number of the chlorine atom is 17. The atomic mass number can be estimated by rounding the atomic mass to 35. From this information, you can find the number of neutrons, protons, and the number of electrons.

1. How many neutrons are in the chlorine atom?
2. How many electrons are in the chlorine atom?
3. How many protons are in the chlorine atom?

Answers

Answer:

1. 18 neutrons

2. 17 electrons

3. 17 protons

Answer:

1. 18 neutrons

2. 17 electrons

3. 17 protons

Explanation:

I do not get question 2 and 3 they are really hard someone can help me??

Answers

for number 2 over the counter medicine is medicine u just buy but prescription medicine is medicine recommended by ur doctor.

Medicine benefit people because the types of nutrients help ur body grow healthy. Medicine can grow harmful by u taking an overdose which harms u

Read the following graduated cylinder.



47 mL
47.2 mL
47.25 mL

Answers

Answer:

47 mL

Explanation:

By the image, the beaker graduation will from 45 from 50 mL, passing by 5 markings. So each mark has 1 mL. To read the volume, we have see the meniscus, which is the concave superficie of the liquid. The meniscus is above the second mark, so it passed 2 mL from the 45 line, the volume is 47 mL.
47.2 mL is the correct answer

Which statement describes one acid-base theory?(1) An acid is an H+ acceptor, and a base is an H+ donor.

(2) An acid is an H+ donor,. and a base is an H+ acceptor.

(3) An acid is an H- acceptor, and a base is an H-donor.

(4) An acid is an H- donor, and a base is an H­ acceptor.

Answers

The answer is an acid is an H+ donor and a base is a H+ acceptor. This is in accordance to the Lewis definition of acids, which states that an acid is any substance that is able to release H+ ions in a solution or one that is able to accept a pair of nonbonding electrons. Another example of an acid-base theory is the Bronsted-Lowry theory of acids and bases.

Photosynthesis is a vital process for plants, animals and humans, and the environment? Give at least two examples of how plants, animals and humans, and the environment benefit from photosynthesis.

Answers

When photosynthesis occurs, carbon dioxide is consumed by the plant and oxygen is the by-product of the reaction. Oxygen is vital to survival since we need it to breathe. 

Photosynthesis is how plants make food for themselves. We get our food directly (we eat vegetables) and indirectly (herbivorous animals)  from plants. 
photosynthesis produces food for plants
this requires carbon dioxide and water to react in the present of sunlight and also chlorophyll to produce glucose and oxygen
1.animals need the oxygen supplied for respiration
2.photosynthesis helps to balance the carbon dioxide content in air, it reduces the amount of carbon dioxide thereby reducing occurrence of global warming
3.also there are animals that depend on plants for their food ,herbivores,without photosynthesis the crop will die depriving the animal of its food supply
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