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VARVARA [1.3K]
3 years ago
7

PLEASEEEEEEE HELPPPPPPPPPP I BEGGGGG FOR HELPPPPPPP

Chemistry
1 answer:
pantera1 [17]3 years ago
6 0

Answer:

Number of Nacl units in mass of 87.75 grams = 1.50

Explanation:

Mass of one unit of NaCl or one atom of NaCl is  58.44 g/mol

The total mass of the NaCl is 87.75  grams.

The number of unit in 87.75  grams of NaCl is equal to 87.75  grams  divided by mass of one unit of NaCl i.e  58.44 g/mol

This can be mathematically be presented as

\frac{87.75}{58.44} \\ Units

1.50 Units

Number of Nacl units in mass of 87.75 grams = 1.50

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Car A has a mass of 1.200 kg and is traveling at a rate of 22 km/hr. Car B has a mass of 1200 kg and is traveling in the
Zigmanuir [339]

Answer:

Car B has a greater momentum than car A

Explanation:

Given data:

Mass of car A = 1200 Kg

speed of car A = 22 km/hr

Mass of car B = 1200 Kg

speed of car B = 25 Km/hr

Solution:

For car A:

p = mv

p = 1200 Kg × 22 km/hr

p = 26400 kg.km/hr

For car B:

p = mv

p = 1200 Kg × 25 km/hr

p = 30,000 kg.km/hr

7 0
3 years ago
If you knew the number of valence electrons in a nonmetal atom, how would you determine the valence of the element?
Mrrafil [7]
If we knew the number of electrons in the outermost shell, the valence electrons, then we could find the valency of the element by calculating how many electrons need to be gained or lost to achieve stable electronic configuration.
For example, if an element has 7 valence electrons, and requires 8 valence electrons to be stable, then its valency will be -1.
3 0
3 years ago
1. Using the periodic table and your knowledge of patterns and trends on the table, which of the following elements is the best
Annette [7]

From the periodic table as well as the patterns and trends on the table, the correct option are:

  1. the best conductor of electricity is Titanium; option A
  2. the most reactive element is oxygen; option C
  3. the elements that has the highest electronegativity is oxygen; option C

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

Periodic trends in the periodic table refers to the variation in character which is observed in the periodic table as one moves across the periodic table from left to right across a period or down a group in the periodic table.

The periodic trend observed is that reactivity of metals increase down a group and from right to left across a period.

For non-metals,  reactivity of non-metals increase from down to top in a group and from left to right across a period across a period.

Considering the given questions;

1. From the periodic table as well as the patterns and trends on the table, the best conductor of electricity is Titanium since it is the only metal in the list.

2. The most reactive element is oxygen because it is a non-metal found to the top-left of the periodic table.

3. The elements that has the highest electronegativity is oxygen because it is a non-metal found to the top-left of the periodic table.

Learn more about periodic trends at: brainly.com/question/28161428

#SPJ1

3 0
1 year ago
Select the objects that hold the same amount of liquid as a 160−fluid-ounce jug. Select all that apply. A four 1−quart bottles B
Finger [1]

B, D and E

Explanation:

conversion factors

1c = 8oz

1pt = 2c

1qt = 2pt

For A and B

ounces to cup  = 160/8 = 20c

cup to pints = 20c / 2c = 10pt

pint to quarts = 10pt/2pt = 5qt  

B applies as four 1-quart and two 1-pt  = 5 1-quart

Considering C

4 8oz = 32oz

160-32 = 128oz /8 = 16c/2 = 8pints C  does not apply

considering D

8 * 8 = 64oz

160 - 64 = 96oz/8 = 12c/2 = 6pt/2 = 3qt

So D applies

E applies

5 0
3 years ago
How is the Nazca plate moving in relation to the Pacific plate?
Igoryamba
The Nazca Plate is bounded on the west by the Pacific Plate and to the south by the Antarctic Plate through the East Pacific Rise and the Chile Rise.The Nazca plate is an oceanic tectonic plate in the southeastern Pacific Ocean that shares both convergent and divergent boundaries.
4 0
3 years ago
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