Why is pseudo science not real science

The mass percent of a solution made by dissolving 59.1 g of kf in 947 g of h2o

DochEvi [55]

Answer:

5.87%

Explanation:

Mass fraction of a solution is the ratio of mass of the solute to the total mass of the solution (Note that it is the total mass of the solution, i.e the sum of masses of solvent and solute). Mass percent is mass fraction times 100.

Here, the solute is KF and its mass is 59.1g. The solvent as usual is $H_{2}O$ and its mass is 947g. Therefore, the total mass of the solution (solution is the mixture of solvent and solute, here KF and $H_{2}O$ ) is 59.1 + 947 = 1006.1g.

The mass fraction is the ratio of mass of KF to the total mass of solution = $\frac{59.1}{1006.1} = 0.0587$ .

Thus, the mass percent is mass fraction × 100 = 0.0587 × 100 = 5.87 %

5 0

4 years ago

Which of the following are products of combustion?

Galina-37 [17]

The answer option which are products of combustion is: D. Heat and light.

In Chemistry, there are five (5) main types of chemical reaction and these include;

Combination reaction.

Double-replacement reaction.

Decomposition reaction.

Single-replacement reaction.

Combustion reaction.

A combustion reaction can be defined as an exothermic chemical reaction between physical substances, usually in the presence of oxygen and hydrocarbons to produce heat, light and carbon.

An example of a combustion reaction is the burning of forest trees and plants.

In conclusion, the products of combustion are heat and light.

7 0

3 years ago

The reaction between solid aluminum and liquid bromine is exothermic. This reaction creates

n200080 [17]

Answer:

correct answer is d)

Explanation:

This answer demonstrates law of conservation of mass because the mass of the products is equal to the mass of reactants with the help of the coefficients which is the process known as balancing. This answer also includes the correct formulas, as Br is a gas so it MUST be written as Br2. hope this helps:)

7 0

3 years ago

Reacting molecules or ions in a solution at room temperature are in constant motion and collide. some collisions lead to a forma

Lynna [10]

A chemical reaction occurs only when the collision between the reacting molecules takes place. However, not all the collisions are efficient in making the reaction. The products are produced only when the molecules colliding exhibits a certain kind of minimum energy known as threshold energy.

The threshold energy refers to the least amount of energy needed for the reactants to collide effectively, and to produce the activated complex. It is kinetic energy in supplementation with the energy of activation. Hence, threshold energy is more in comparison to the activation energy.

5 0

3 years ago

Read 2 more answers

What expression approximates the volume of O2 consumed, measure at STP, when 55 g of Al reacts completely with excess O2?2 Al(s)

nikdorinn [45]

Answer : The volume of $O_2$ consumed are, $0.75\times 2\times 22.4$ L.