Question

1. because the balloon is placed on top of the flask, the substances in the flask are part of a closed system. use the drop - down menus to complete the statement that describes the contents of the closed system.

the initial mass of the substances in the flask is 1 - (a) the same as (b) more than (c) less than the final mass of the substances in the flask. this is because the balloon 2 - (a) shrinks (b) expands (c) seals the flask. the initial volume of the substances in the flask is 3 - (a) the same as (b) more than (c) less than the final volume of the substances in the flask. this is because the balloon 4 - (a) shrinks (b) expands (c) is flammable.

1. use the law of conservation of matter to solve the following question.

sample x has a mass of 22.7 g and reacts with sample y to form sample xy with a total mass of 86.9 g. what is the mass of sample y?
a 64.2 g
b. 75.2 g
c. 109.6 g
d. 115.8 g
12 what happens to the mass of an object when the parts are rearranged?
a the total mass of the object triples.
b. the total mass of the object remains the same.
c. the total mass of the object increases if heavier parts are on the bottom.
d. the total mass of the object decreases if lighter parts are on the bottom.

Explanation:

Question 11

Step1: Apply the law of conservation of matter

The law of conservation of matter states that mass is conserved in a chemical reaction. So, \(m_X + m_Y=m_{XY}\).

Step2: Solve for \(m_Y\)

We know \(m_X = 22.7\space g\) and \(m_{XY}=86.9\space g\). Rearranging the formula \(m_Y=m_{XY}-m_X\).
Substitute the values: \(m_Y = 86.9 - 22.7\).

$$m_Y=64.2\space g$$

The law of conservation of mass (matter) states that mass is neither created nor destroyed. When the parts of an object are rearranged, no mass is added or removed.

Answer:

A. \(64.2\space g\)

Question 12