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maw [93]
3 years ago
7

Which system contains the teeth, saliva, stomach, small intestine, large intestine and colon?​

Chemistry
1 answer:
lapo4ka [179]3 years ago
8 0

Answer: Digestive system.

Explanation: Assuming that you are human, you use this system a few times a day. They system is one of the bodies key functions to remain alive. The teeth grind down the food, the saliva allows it to be swallowed, the stomach has acids that break down the food, the small intestine absorbs the nutrients from the food eaten, the large intestine gets rid of the waste left over.

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How many neutrons does element X have if its atomic number is 37 and its mass number is 80?
Verizon [17]
Answer: 43.

Explanation:

Mass number is the sum of protons and neutrons of an atom.

The number of prortons is the atomic number, so you can write:

Mass number = atomic number + number of neutrons. From which you get;

number of neutrons = mass number - atomic number = 80 - 37 = 43

All the atoms of a given element have the same number of protons. That is why the number of protons idenfies the elements and is called atomic number.

The number of neutrons of a given element may be different for different atoms of the same element.

The atoms of an element that have different number of neutrons are called isotopes. So, different isotopes of the same element have same atomic number but different mass number.


5 0
3 years ago
Read 2 more answers
A 63 gram piece of magnesium absorbs 6689 joules of heat. The final temperature is 663 degrees Celsius. What was the initial tem
Gemiola [76]

Answer:

559^{\circ}C

Explanation:

When heat is supplied to a substance, the temperature of the substance increases according to:

Q=m C (T_f-T_i)

where

Q is the amount of heat supplied

m is the mass of the substance

C is the specific heat capacity of the substance

T_i is the initial temperature

T_f is the final temperature

For the sample of magnesium in this problem, we have:

m = 63 g is the mass

Q = 6689 J is the hear supplied

C = 1.023 J/gC is the specific heat capacity

T_f=663^{\circ}C is the final temperature

Solving the formula for T_i, we find the final temperature:

T_i = T_f-\frac{Q}{mC}=663-\frac{6689}{(63)(1.023)}=559^{\circ}C

6 0
3 years ago
Something that is made out of natural resources for human use is called
ANEK [815]

Answer:

Man-made resources

Explanation:

Humanized resources are items or substances that have value to human lives that do not occur in the natural world. Examples of man-made resources include plastic, paper, soda, sheet metal, rubber and brass. These contrast with natural resources, such as water, crops, sunlight, crude oil, wood and gold.

6 0
3 years ago
Which statement best describes a difference between scientists and engineers?
Rashid [163]
Answer. Answer: Scientists study how things work, while engineers create new things
3 0
3 years ago
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Which skill involves creating representation of complex objects or processes
lesya692 [45]

Answer:

Making models

Explanation:

Classifying is the grouping together of items that are alike in some way. Answer: Making models involves creating rep- resentations of complex objects or processes.

6 0
3 years ago
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