Chemistry » Page 82

Chemistry

Jayleen Richmond

Visible light is the

A. highest energy level on the electromagnetic spectrum.

B. only part of the electromagnetic spectrum that can be seen by humans.

C. lowest energy on the electromagnetic spectrum.

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Chemistry

Brooke Murillo

Which of the following is likely to be the most valid source of information about pollution?

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Chemistry

Kendrick Knox

Which traits did Meiolania have

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Chemistry

Marlee Haley

One of the alkali metals reacts with oxygen to form a solid white substance. when this substance is dissolved in water, the solution gives a positive test for hydrogen peroxide, h2o2. when the solution is tested in a burner flame, a lilac-purple flame is produced. what is the likely identity of the metal?

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Chemistry

Caroline Stark

Whats more metallic silicon sodium sulfur or thallium

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Chemistry

Adyson Mahoney

Draw the structure of the isomer that have the molecular formula C5H11Br that is incapable of reacting by E2 mechanism

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Chemistry

Hayden Yu

How does density of air related to elevation (altitude)

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Chemistry

Francesca Potter

4. How many moles are in 54.0 grams of Silver?

54.0 g Ag x (108mol ag / 1 g ag) = 5,832 ag moles Ag

(Use the gray boxes to insert the values for the conversion factors.)

5. What is the mass of 6.3 moles of Sulfur?

6.3 mol S x (/) = g S

6. How many atoms are in 6.0 moles of Argon?

6.0 mol Ar x (/) = atoms of Ar

7. How many moles of Kr are in 112 g of Krypton?

112 g Kr x (/) = moles of Kr

8. How many moles are in 1.93 x1024 formula units of KF, potassium fluoride?

1.93 x1024 formula units x (/) = mol KF

(The next two problems need 2 step conversions - so there are two conversion factors (fractions) for the problem - remember the mole map - covert to moles first, then to the desired unit.)

9. How many atoms are in 86.2 g of Si (silicon) ?

86.2 g Si x (/) x (/) = atoms of silicon

10. What is the mass in grams of 4.8 x 1024 atoms of Magnesium?

4.8 x 1024 atoms of Mg x (/) x (/) = g Mg

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Chemistry

Kenya Sims

Which of the following orbitals is the largest in size?

A. 2s

B. 4s

C. 1s

D. 3s

E. all s orbitals are the same size

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Chemistry

Beyonce

What are the three steps in farming to imprpve the food production

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Chemistry

Fatima Wu

What is the ratio of the density of a substance to the density of a standard?

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Chemistry

Petty

The number of moles of oxygen gas needed to react with 4.0 moles of mg is

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Chemistry

Brent Forbes

What is the de Broglie wavelength of a proton with a velocity of 2.5e6

m/s?

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Chemistry

Amira

Which body parts are part of the axial region of the body? Check all that apply.

head

legs

arms

neck

torso

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Chemistry

Jaxson Chaney

An employee bills customers for the amount of the item or service purchased, but the employee records lower purchases in the ledger and steals the money. What type of fraud is this?

A) accounts receivable fraud

B) inventory fraud

C) accounts payable fraud

D) Ponzi scheme

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