i have several problems i am caught on for my homework. I appreciate any help
1. As milk spoils, rancid components begin to coagulate. This could be interpreted as a:
a.a colloid forming a suspension.
b.solution forming a colloid.
c.solution forming a suspension.
d.suspension forming a colloid
2.A gas occupies a volume of 8.60 L at 45°C and 764 torr. What pressure would it occupy if the volume is adjusted to 13.3 L at 20°C?
a.455 torr
b.109 torr
c.188 torr
d.536 torr
3. For solute particles to be soluble in liquid solvents
a.they must be of smaller size than solvent molecules and be able to interact with solvent molecules through covalent interactions.
b.the solvent must be nonpolar.
c.they must be about the same size as the solvent molecules and be able to interact with the solvent molecules through noncovalent interactions.
4.The net ionic equation for the reaction of sodium hydroxide, NaOH, and magnesium nitrate, Mg(NO3)2, contains which of the following species?
a.Mg(OH)2 (s)
b.NaNO3 (aq)
c.2Mg2+ (aq)
d.Na+
5.A patient's blood test indicates that 1.00 mL of serum contains 0.00140 g of fibrinogen (a protein that aids in coagulation of blood). What is the concentration of the fibrinogen in mg/dL?
a.280 mg/dL
b.14 mg/dL
c.0.014 mg/dL
d.140mg/dL
I suggest you repost this at the top of the page but add what you don't understand about the question or what numbers you have to show in your work.
can anyone help please
Number 1 would be letter (a) since milk is already a colloid, it will create a suspension that will settle at the bottom.
Sure! I'd be happy to help you with your homework problems. Here are the explanations for each question:
1. To answer this question, you need to understand the difference between a solution, a colloid, and a suspension. In a solution, the solute particles are evenly distributed and do not settle out, while in a suspension, the solute particles are large and settle out over time. A colloid falls between these two categories, with particles that are larger than those in a solution but smaller than those in a suspension. Given that milk spoiling involves the coagulation of rancid components, which implies the formation of larger particles that would settle out, we can conclude that the answer is (d) suspension forming a colloid.
2. This problem requires the application of the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin. To solve for the pressure in the new volume at the new temperature, you need to use the combined gas law, which is a rearrangement of the ideal gas law: (P1 × V1) / T1 = (P2 × V2) / T2. Plugging in the given values, you can solve for P2 to find the new pressure. In this case, the answer is (c) 188 torr.
3. To answer this question about solubility, you need to consider the interactions between solute particles and solvent molecules. For solute particles to be soluble in a liquid solvent, they generally need to be able to interact with solvent molecules. This can happen through various types of interactions, such as hydrogen bonding or London dispersion forces. Additionally, the size of the solute particles should ideally be similar to the size of the solvent molecules to promote solubility. Based on these criteria, the answer is (c) they must be about the same size as the solvent molecules and be able to interact with the solvent molecules through noncovalent interactions.
4. To determine the net ionic equation for the reaction between sodium hydroxide (NaOH) and magnesium nitrate (Mg(NO3)2), you need to write the balanced molecular equation first. The molecular equation is NaOH + Mg(NO3)2 → Mg(OH)2 + 2NaNO3. Then, you need to identify the species that undergo a chemical change and are present in the same form on both sides of the equation. In this case, that would be Mg(OH)2, which forms a solid precipitate. Therefore, the answer is (a) Mg(OH)2 (s).
5. To find the concentration of fibrinogen in mg/dL, you need to convert the given mass in grams to milligrams and divide it by the volume in milliliters. The concentration is calculated as mass/volume. When you calculate this, you will get 1.40 mg/dL. However, the question specifies that the mass is given for 1.00 mL of serum, so the answer is (b) 14 mg/dL.
I hope these explanations help you understand how to solve the problems! Let me know if you have any further questions.