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Tom [10]
3 years ago
9

A student is studying the ways different elements are similar to one another. Diagrams of atoms from four different elements are

shown below. Nucleus Nucleus Atom 1 Atom 2 Nucleus Nucleus Atom 3 Atom 4​
Chemistry
1 answer:
alisha [4.7K]3 years ago
6 0

Answer:

atom 1 and atom 2

Explanation:

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1) Os-182 has a half-life of 21.5 hours. How many grams of a 10 g sample would have decayed after
Monica [59]

Answer:

1.25 g

Explanation:

.5^3 = 0.125

0.125*10 = 1.25 g

8 0
3 years ago
What is the percentage of water in the hydrate CoCl2*6H20?
lord [1]
You are given the hydrate CoCl2.6H20. You are required to get the percentage of water in this chemical substance. The first thing to do is to get the molar mass of CoCl2.6H20 and CoCl2. The molar masses are 237.8 grams per mole and 129.8 grams per mole respectively. The formula in getting the percentage of water is  

%=[1-(grams of CoCl2/grams of CoCl2.6H20)]*100.  

Substitute the molar masses of CoCl2.6H20 and CoCl2.  

%=[1-(129.8 grams of CoCl2/237.8 grams of CoCl2.6H20)]*100.
<u>% of water = 45.42%</u>
4 0
3 years ago
Read 2 more answers
When in contact with hydrochloric acid, which mineral gives off bubbles of carbon dioxide gas?.
xxTIMURxx [149]

Answer:

Calcite

Explanation:

When in contact with hydrochloric acid, calcite releases carbon dioxide gas.

8 0
3 years ago
Sound travels faster through solids than it does through either liquids or gases a student could verify this statement by
irina [24]

Group of answer choices.

A. Distance that sound travels through a solid, a liquid, and a gas.

B. Pitch of sound when it passes through a solid, a liquid, and a gas.

C. Distance sound travels through a solid, a liquid, and a gas at varying temperatures.

D. Time required for sound to travel a set distance through a solid, a liquid, and a gas.  

Answer:

D. Time required for sound to travel a set distance through a solid, a liquid, and a gas.

Explanation:

Sound are mechanical waves that are highly dependent on matter for their propagation and transmission.

Sound travels faster through solids than it does through either liquids or gases. A student could verify this statement by measuring the time required for sound to travel a set distance through a solid, a liquid, and a gas.

Mathematically, the time required for sound to travel is given by this formula;

Time = \frac {distance (x)}{speed (v)}

Hence, the time taken for sound to travel through each medium (solid, liquid and gas) would be measured, recorded and compared to one another.

4 0
3 years ago
Nitrobenzene contains 5 hydrogen atoms 6 carbon atoms 2 oxygen atoms and 1 nitrogen atom. what is the chemical formula for nitro
tamaranim1 [39]
To develop the chemical formula of a substance or compound in this regard, one only needs to write the chemical symbol for each of the element present and write as subscript to each symbol the number of atoms of that element. For nitrobenzene, as described above, the chemical formula should be,
                      C₆H₅O₂N
3 0
3 years ago
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