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MArishka [77]
2 years ago
12

A substance made of two or more elements that have been chemically combined is a(n) ______.

Chemistry
2 answers:
RideAnS [48]2 years ago
5 0
Compound (for example: H2O)
Anvisha [2.4K]2 years ago
3 0

Answer: Compound

Explanation:

Element is a pure substance which is composed of atoms of similar elements. Example: Fe

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.  Example: CaCO_3

Mixtures are heterogeneous materials as they do not have uniform composition and the components are not evenly distributed throughout the material. Example: Sugar solution

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True or false if an object displaces 50 ml of water the object's volume is 50mL
andrew11 [14]

Answer:

True

Explanation:

The volume of water displaced by an object completely submerged is its actual volume. It implies that in the container the object create a space of size for itself which is the volume of the object. This approach is used in calculating the density of many irregular solids from their measured masses.

6 0
3 years ago
a 25.5 liter balloon holding 3.5 moles of carbon dioxide leaks. If we are able to determine that 1.9 moles of carbon dioxide esc
kap26 [50]

Answer:

11.66 L.

Explanation:

  • We can use the general law of ideal gas: <em>PV = nRT.</em>

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

  • If P and T are constant, and have different values of n and V:

<em>(V₁n₂) = (V₂n₁).</em>

V₁ = 25.5 L, n₁ = 3.5 mol.

V₂ = ??? L, n₂ = 3.5 mol - 1.9 mol = 1.6 mol.

<em>∴ V₂ = (V₁n₂)/(n₁)</em> = (25.5 L)(1.6 mol)/(3.5 mol) =<em> 11.66 L.</em>

4 0
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I would probally say,

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