Question

question 6 (4 points)
(01.02 mc)
jeff used an equal arm balance to weigh a 4.312 g sample of sodium chloride. which of these measurements made by jeff is the most accurate?
a 4.1 g
b 4.2 g
c 4.3 g
d 4.5 g

question 7 (4 points)
(01.04 lc)
which of the following describes the characteristics of a plasma?
a particles are packed closely together, have low compressibility, and usually maintain their organized, set shape.
b particles are positively and negatively charged, have high compressibility, and spread out to fill a container.
c particles move around in a semi - organized way, take the shape of a container, and fill a container from the bottom up.
d particles move freely, have high compressibility, and spread out evenly to fill a container.

Explanation:

Question 6

Step1: Understand accuracy

Accuracy is how close a measurement is to the true value (4.312 g here). We compare the absolute differences between each option and 4.312.

Step2: Calculate differences

• For a: \(|4.1 - 4.312| = 0.212\)
• For b: \(|4.2 - 4.312| = 0.112\)
• For c: \(|4.3 - 4.312| = 0.012\)
• For d: \(|4.5 - 4.312| = 0.188\)

Step3: Identify smallest difference

The smallest difference is 0.012 (for 4.3 g), so it's the most accurate.

• Option a: Describes solids (closely packed, fixed shape, low compressibility).
• Option b: Plasma has ionized (charged) particles, high compressibility, and fills container (matches plasma properties).
• Option c: Describes liquids (semi - organized, takes container shape, fills from bottom).
• Option d: Describes gases (free movement, high compressibility, even filling), but gases are neutral while plasma has charged particles.

Answer:

c. 4.3 g

Question 7