CHEMISTRY HIGH SCHOOL

Which of these features was formed by hotspot volcanism?The Grand Canyon
The Big Island of Hawaii
The Appalachian Mountains
The Himalaya Mountain Range

Answers

Answer 1
Answer: These feature that was formed by hotspot volcanism is The Big Island of Hawaii. The Hawaiian Islands are actually found at the tip of several volcanoes that has been formed by a series of volcanic eruptions. Today, the Big Island sits on the hotspot, and contains the only active volcanoes of the group of islands.
Answer 2
Answer: The Big Island of Hawaii was formed by hotspot volcanism, whereas The Grand Canyon, The Appalachian Mountains, and The Himalaya Mountain Range were not.

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Which changes occur as a cadmium atom, Cd, becomes a cadmium ion, Cd2+?(1) The Cd atom gains two electrons and its radius decreases.
(2) The Cd atom gains two electrons and its radius increases.
(3) The Cd atom loses two electrons and its radius decreases.
(4) The Cd atom loses two electrons and its radius increases.

Answers

The answer is (3). To form the cation (positive ion), Cd must lose negative charge, so two electrons are lost. This loss in electrons also increases the effective nuclear charge/ reduces electron shielding. In other words, with two less electrons to hold, the nucleus exerts a stronger attractive force on the remaining electrons, so the electron cloud is pulled closer to the nucleus. The radius therefore decreases.

What is the total number of electrons shared in a double covalent bond?(1) 1 (3) 3
(2) 2 (4) 4

Answers

The correct answer is option 4. In a double covalent bond, two pairs of electrons are bonded or there is a total of four electrons being shared in a bond. For example, we have oxygen. Two atoms of oxygen share two pairs of electrons to have a stable structure.

What is the mass of a neutron?

Answers

1.008 I am Very sure We just learned this..
1.008 amu is the mass of a neutron. 

How many grams of HNO3 can be produced from 400.g of No2?

Answers

I assume that NO2 is being reacted with water

First we need the balanced equation for this reaction: 3 NO2(g) + H2O(l) = 2 HNO3(aq) + NO(g)

Second, find moles of NO2:
(400.g NO2)/(46.01g/mol NO2) = 8.69mol NO2

Third, multiply moles by the mole ratios of NO2 to HNO3 to get moles of HNO3: (8.69mol NO2)(2mol HNO3/3mol NO2) = 5.79mol HNO3

Fourth, multiply moles of HNO3 by its molar mass: (5.79mol HNO3)(63.01g/mol HNO3) = 365g HNO3 produced

When she told us the party was canceled there was a deafening silence? A. Malapropisms B.imagery C. Hyperbole D.oxymoron

Answers

The answer is: D.oxymoron.

The oxymoron  is a combination of contradictory or incongruous words.

In this example, deafening silence.

Deafening is a noise so loud as to make it impossible to hear anything else.

Silence is oposite of deafening, complete absence of sound.

Other examples are: big baby, original copy, living dead, sweet sorrow, soft rock, pretty ugly.
Hi There! :D

When she told us the party was canceled there was a deafening silence? A. Malapropisms B.imagery C. Hyperbole D.oxymoron

oxymoron

What does the empirical formula of a compound describe?

Answers

it is what form where all coeficients are made into the smallest whole numbers

example

2C+4HC=8HC could be simplified to
C+2HC=4HC (note: formula is not a liegit one, only for example)
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