Answer:
The percent by mass of water in this crystal is:
Explanation:
This exercise can be easily solved using a simple rule of three where the initial weight of the hydrated crystal (6,235 g) is taken into account as 100% of the mass, and the percentage to which the mass of 4.90 g corresponds (after getting warm). First, the values and unknown variable are established:
- 6,235 g = 100%
- 4.90 g = X
And the value of the variable X is found:
- X = (4.90 g * 100%) / 6,235 g
- X = approximately 78.6%.
The calculated value is not yet the percentage of the water, since the water after heating the glass has evaporated, therefore, the remaining percentage must be taken, which can be calculated by subtraction:
- Water percentage = Total percentage - Percentage after heating.
- <u>Water percentage = 100% - 78.6% = 21.4%</u>
Answer:
b, d, e
Explanation:
Three type basic static stresses to which a material can be subjected are
Tensile: Stress generated due to elongation force on the body.
Compressive: The stress generated when the body is compressed.
Shear: The stress generated when a force parallel to cross-section are of the body.
Hardness, reduction in area and true stress are material properties.
Answer:
Impossible to balance
Step-by-step explanation:
There is an infinite number of solutions, because the equation is a combination of two simpler ones.
One reaction forms C, and the other forms CO₂.
C₁₂H₂₂O₁₁ ⟶ 12 C + 11 H₂O
C₁₂H₂₂O₁₁ + 24H₂SO₄⟶ 12CO₂ + 35H₂O + 24SO₂
You can add the two equations in an infinite number of linear combinations, so there is no unique solution.
La materia puede encontrarse en diferentes estados dentro de nuestro planeta: líquido, sólido y gaseoso. Fuera de la Tierra existe un cuarto estado, conocido como plasma, que abunda en lugares como el Sol y las estrellas.