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SpyIntel [72]
3 years ago
13

How does your pattern of breathing change when you exercise and then rest ?​

Chemistry
1 answer:
Paladinen [302]3 years ago
7 0

Your pattern of breathing increases, making it faster than usual, when you're exercising because you're pushing your body to work harder and speeding up your heart rate making you tired.

When you're resting your breathing pattern should be steady and normal since you aren't doing anything that requires lots of body work or something that would make you out of breath.

Hope this helps,

Davinia.

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Maria is baking cookies. She mixes water, flour, sugar, baking powder, butter and chocolate chips and then measures the mass of
Mrrafil [7]

Answer:

The law of conservation of mass was obeyed since some of the mass evaporated while the cookies were baking.

Explanation:

Maria mixes water, flour, sugar, baking powder, butter and chocolate chips and then measures the mass of her ingredients.

Initial mass of ingredients = 1053 g

Final mass = 845 g

All these information are not of any great help.

Law of conservation of mass states that:

For any system closed to all transfers of matter and energy, the mass of the system can not change with respect to time, as system's mass cannot change, any mass can neither be added nor be removed.

In this process of baking, considering the cookies as our system, they never formed a closed system. Hence were free for evaporation.

During the process of baking, water from dough must have evaporated and mass must have reduced.

Hence, the law of conservation of mass was not obeyed.

8 0
3 years ago
Read 2 more answers
Four people weigh a standard mass of 10.00g on the same balance. Which of the following sets of readings suggests measurements t
Svetach [21]
An example of accurate but not precise would be 3 people weigh a 10g sample. the weights are 0g, 10g, & 20 grams. the scale is way off but the weights average to the right thing.
precise but not accurate would weighing a 10g sample 3 times and getting 5.5, 5.4, & 5.5. they'e all incredibly similar therefore precise but its nowhere near 10, so not accurate. 
neither precise nor accurate would be 3 weights being 10, 20, &30. It averages wrong and is imprecise.
5 0
3 years ago
Name a metal that would be magnetic
eimsori [14]
A metal that would be magnetic is nickel
7 0
2 years ago
How do you identify the group and period number of an element with example
11Alexandr11 [23.1K]

The period is equal to the number of shells present in an atom.

The group number is equal to the number of valence electrons.

<h3>What is the period in the periodic table?</h3>

A period in the periodic table is a row of chemical elements.

The horizontal rows (which Mendeleev called series) are called periods and the vertical columns, are groups.

Elements having similar outer electronic configurations in their atoms are arranged in vertical columns.

The period indicates the value of n for the outermost or valence shell. The period is equal to the number of shells present in an atom. To find a period, the no. of shells =no. of periods.

Example: Na- 2,8,1 - Three shells are there, so period no. is 3.

Calcium - 2,8,8,2 - Four shells are there, so period no. is 4.

To determine the group, we need to understand some rules:

1. If the element is in s block, then the group number is equal to the number of valence electrons.

Example: Mg(12) - 2,8,2

Group = no. of valence electrons = 2

2. If the element is in the p block, then the number of the group can be determined by the formula: (number of valence electrons + 10).for groups.

Example: S(16) - 2,8,6

Group = no. of valence electrons+ 10 = 6+ 10 = 16

3. If the element is in the d block, then the number of the group can be determined by the formula: number of electrons in(n−1)d subshell + (number of electrons in (n)s subshell).

Example: Fe(26):

[Ar]3d^64s^2

Group = number of electrons in(n−1)d subshell + (number of electrons in (n)s subshell) = 6+2 = 8

4. If the element is in the f block, then the number of the group is always 3.  Example: Cerium (58) belongs to the 3rd group.

Learn more about the period in the periodic table:

brainly.com/question/11965624

#SPJ1

6 0
2 years ago
The density of a sample that a mass of 10.740 g and a volume of 5.0 mL is ?
ivolga24 [154]
Density = mass/volume

So..

D = 10.74/5

D = 2.148 g/mL ^3
7 0
3 years ago
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