CHEMISTRY HIGH SCHOOL

Select the correct answer.John is riding a ski lift to the top of Wildcat Mountain. He removes his gloves and rapidly rubs his hands together to warm them up. What
happens when John rubs his hands?
O A. The skin on his hands rapidly conducts heat, similar to metal.
O B. He traps heat between his hands because skin is an insulator. IS
O C. The particles In his hands vibrate faster because of friction.
O D. Thermal energy moves from his fingertips to his palms.
O E. He simulates a fever that'll raise his core body temperature.

Answers

Answer 1

Answer:

Answer:

Fairly certain it's C. The particles In his hands vibrate faster because of friction :)

Answer 2

Answer:

Answer:

Explanation:

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A student views four models showing magnified views of the phases of matter.What question will best help the student determine which model is plasma?
A
Which model is composed of rapidly moving particles?
B.
Which model is composed of particles vibrating in place?
C
Which model is composed of electrically charged particles?
Which model is composed of particles sliding past each other?

Answers

Answer:

C Which model is composed of electrically charged particles?

Explanation:

The best question to resolve and determine the model which is plasma is to find one that is composed of electrically charged particles.

Plasma is one of the states of matter which is characterized by ions and other charged particles.

Matter is anything that has weight and occupies space.

There are four known states of matter which are:

Solid
Liquid
Gas
Plasma

Plasma is the only state of matter made up of charged particles.

What is the phase of matter that has no fixed volume and no fixed shape? Solid

Gas

Liquid

Frozen

Answers

Gases have no fixed volume or shape
- Solid have both a fixed volume n shape
- Liquids have a fix volume but not a fixed shape

How many moles are in 1.2 x 10 ^ 3 grams of ammonia

Answers

Molar mass ammonia:

NH₃ = 17.031 g/mol

$n = (m)/(M)$

$n = (1.2*10^3 g)/(17.031 g/mol)$

$n = 70.459$ moles

hope this helps!

Consider the balanced equation. N2 + 3H2 mc033-1.jpg 2NH3

What is the percent yield of NH3 if the reaction of 26.3 g of H2 produces 79.0 g of NH3?

Answers

The balanced chemical reaction is:

N2 + 3H2 = 2NH3

We are given the amount of H2 being reacted. This will be our starting point.

26.3 g H2 (1 mol H2 / 2.02 g H2) 2 mol O2/3 mol H2) ( 17.04 g NH3 / 1mol NH3) = 147.90 g O2

Percent yield = actual yield / theoretical yield x 100

Percent yield = 79.0 g / 147.90 g x 100

Percent yield = 53.4%

Ionic crystals are extremely malleable because they contain a positively charged metal ion,TRUE

FALSE

Answers

The statement “Ionic crystals are extremely malleable because they contain a positively charged metal ion” is false. Ionic crystals are composed of positive and negative ions that are combined so that the numbers of positive and negative charges are equal.

What is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid?