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3 years ago

The most familiar elements are typically the most

Chemistry

2 answers:

egoroff_w [7]3 years ago

5 0

Explanation:

The most familiar elements are the ones most abundant in the earth and therefore the most economic ones. Good examples of this elements are oxygen, carbon, nitrogen silicium.

rodikova [14]3 years ago

4 0

-Are the most used in daily life and basic human needs

(such as oxygen,nitrogen,carbon, etc)

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1. If I have 45 L of He in a balloon at 25 degrees celsius and increase the temperature of the

Greeley [361]

Use Charles' Law: V1/T1 = V2/T2. We assume the pressure and mass of the helium is constant. The units for temperature must be in Kelvin to use this equation (x °C = x + 273.15 K).

We want to solve for the new volume after the temperature is increased from 25 °C (298.15 K) to 55 °C (328.15 K). Since the volume and temperature of a gas at a constant pressure are directly proportional to each other, we should expect the new volume of the balloon to be greater than the initial 45 L.

Rearranging Charles' Law to solve for V2, we get V2 = V1T2/T1.

(45 L)(328.15 K)/(298.15 K) = 49.5 ≈ 50 L (if we're considering sig figs).

7 0

3 years ago

Forrest spills some acid on the lab floor. He notifies his teacher and begins to look for baking soda to neutralize the acid on

riadik2000 [5.3K]

The other students in the lab should be notified next in this type of scenario.

This is a substance which donates protons and is very corrosive. It also turns blue litmus paper red.

When it was spilled and baking soda was used to neutralize it on the floor , it is best to inform the other students too so as to prevent them from being exposed by mistake thereby reducing risk of injury.

Read more about Acid here brainly.com/question/25148363

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1 year ago

HELP PLZ ITS A TEST.

tensa zangetsu [6.8K]

Answer:

The answer to your question is below

Explanation:

1 ) Which of the following is a chemical property.

A. Ability to become magnetic this is wrong, it's a physical property

B. Ability to conduct electricity this is wrong, it's a physical property

C. Ability to conduct heat this is wrong, it's a physical property

D. Ability to react with acid This is the right answer

2 ) You heat two substances, A and B. Both substances change color. When cooled, substance B returns to its original color, but substance A does not. What most likely happened?.

A. Physical change occurred in both substances This is wrong, a physial change only happens in substance B

B. A physical change occurred in substance A, and a chemical change occured in substance B. This is wrong, a physical change occurred in substance B and a chemical change occurred in substance A.

C. A chemical change occurred in substance A, and a physical change occurred in substance B. This is the right answer is exactly what happens

D. A chemical change occurred in both substances This answer is wrong.

3 ) how many grams are in 2.5 pound sample? Express your answer in scientific notation with three significant figures. ( 1 pound= 453.592 grams).

Rule of three

1 pound ------------------- 453.592 g

2.5 pounds --------------- x

x = 2.5(453.592)/1

x = 1133.98 g = 1.13 x 10³ g letter D

7 0

2 years ago

Read 2 more answers

What volume, in L, of a 6.3 M K2SO4 solution contains 44.1 g of K2SO4?

Alenkinab [10]

Answer:

= 1.60 L

Comment if you need step to step explanation.

8 0

3 years ago

PLEASE HELP ASAP WILL GIVE BRAINLIEST

kirill115 [55]

The amount of heat required to convert H₂O to steam is : 382.62 kJ

<u>Given data :</u>

Mass of liquid water ( m ) = 150 g

Temperature of liquid water = 43.5°C

Temperature of steam = 130°C

<h3 /><h3>Determine the amount of heat required </h3>

The amount of heat required = ∑ q1 + q2 + q3 ----- ( 1 )

where ;

q1 = heat required to change Temperature of water from 43.5°C to 100°C . q2 = heat required to change liquid water at 100°C to steam at 100°C

q3 = heat required to change temperature of steam at 100°C to 130°C

For q1

M* S $_{water}$ *ΔT

= 150 * 4.18 * ( 100 - 43.5 )

= 35425.5 J

For q2

moles * ΔHvap

= (150 / 18 )* 40.67 * 1000

= 338916.67 J

For q3

M * S $_{steam}$ * ΔT

= 150 * 1.84 * ( 130 -100 )

= 8280 J

Back to equation ( 1 )

Amount of heat required = 35425.5 + 338916.67 + 8280 = 382622.17 J

≈ 382.62 kJ

Hence we can conclude that The amount of heat required to convert H₂O to steam is : 382.62 kJ.

Learn more about Specific heat of water : brainly.com/question/16559442

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2 years ago