Chemistry » Page 161

Chemistry

Brynn Yates

How many different elements have scientists discovered? 12, 112, 118, or more than 500?

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Chemistry

Mireya Duffy

What is the total mass of Kr-42 remaining in a 20-mg sample after 48.8 hours?

(1) 2.5 mg

(2) 5.0 mg

(3) 10 mg

4) 20 mg

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Chemistry

Bunny Rabbit

Which of the following household appliances is designed to directly convert electrical energy to heat energy?

A.

a can opener

B.

a stove

C.

a garbage disposal

D.

a fan

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Chemistry

Abril Estes

What volume will 12.0 g of oxygen gas occupy at 25 c and a pressure of 52.7 kpa?

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Chemistry

Chaya Mata

Identify the atom represented by this electron configuration and elaborate on its bonding properties. 1s22s22p63s23p64s13d5

a. manganese is a transition metal that can form up to five stable ionic bonds.

b. antimony is a metalloid that can form five covalent bonds or three metallic bonds.

c. chromium is a transition with a half full-valence orbital and can form up to six bonds.

d. bromine is a non-metal that forms one ionic bond or a variable number of covalent bonds.

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Chemistry

Liberty Hammond

What percent of the earth's surface water is fresh water?

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Chemistry

Tristen Garrett

You heat 3.869 g of a mixture of fe3o4 and feo to form 4.141 g fe2o3. What is the mass of oxygen reacted?

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Chemistry

Zaniyah Richard

What kind of waves do cellar telephones use to transmit amend recive signals

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Chemistry

Wiggles

Which process is a physical change?

A. iron rusting

B. milk turning to curd

C. water boiling

D. paper burning

E. hard water staining pipes

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Chemistry

Mariam Mcclure

1. How much calcium oxide would be made by the thermal decomposition of 25 grams of calcium carbonate?

CaCO3 - > CaO + CO2

2. How much oxygen gas can be produced through the decomposition of potassium chlorate (KClO3) if 194.7 g of potassium chlorate is heated and fully decomposes? The equation for this reaction must be balanced first.

KClO3 (s) - > KCl (s) + O2 (g)

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Chemistry

Jeremiah Ali

Ethanol contains the elements carbon, hydrogen, and oxygen. When ethanol burns, it chemically reacts with oxygen gas.

C2H6O + O2

ethanol oxygen gas

What elements will be present in the substances that are created when ethanol burns?

A.

nitrogen, sulfur, and sodium only

B.

carbon, hydrogen, and oxygen only

C.

the elements cannot be determined

D.

carbon and hydrogen only

correct answer is B I answered my own question! lol

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Chemistry

Amani Frye

What are the errors in the table

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Chemistry

Luca Benton

What makes gas turn into a liquid?

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Chemistry

Cuddles

What is exchanged between two or more atoms that undergo ionic bonding?

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Chemistry

Roselyn Summers

If the alum reaction was done starting with 12.000 g of al, how many moles of hydrogen gas would be produced according to the balanced equation?

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