ALA3 Zhanming Lin

Sublimation is preferred over recrystallization when you work with an amount of solid material to be purified that weighs: A) at least 1 kg B) about 100 mg C) about 1 mol D) about 1000 ml A OD

Please answer the following question:

Why is it important to always let hot objects cool before weighing? Convection currents that surround a hot object can interfere with the weighing process. It is safer for people to handle cool objects than hot objects. A plastic weigh boat or weighing paper may be damaged by a very hot sample.

Posttest Direction. Read the questions carefully. Write the letter of the correct answer. 1. Water exists in three states of matter and continuously moving through a cycle on Earth. At which stage in the water cycle does water transform from a gas to a liquid? a.evaporation c. precipitation b. condensation d. Sublimation 2. Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which of the following is the BEST evidence that a chemical reaction occurs when the coal burns? a. Production of mechanical energy c. A new substance is produced b. Production of electricity d. Formation of precipitate 3.Which of these does NOT happen during a chemical change? a. New substances are formed with different chemical properties. b. Attractive force between atoms of molecule formed or break. c. The chemical properties of the substances before and after the reaction are the same d. Energy is always released or absorbed. 4. A granular substance is added to a liquid. Which of the…

Arrange the following steps to explain how microwave oven cooks food. Write No.1-4 on the blank provided, 1 as the first step, and 4 is the last.   ___7. As microwaves pass through the food, they transfer energy to the water molecules in the form of heat. This will cook the food.___8. A part of the oven produces microwaves.___9. The microwaves are sent to the reflecting fan.___10. The microwaves are reflected in many directions by the fan and the walls of the microwave oven.​

1. What are the principal natural processes that affect the petrophysical properties of sedimentary rocks? 2. As shown in Table 1.1, the total bulk chemical analysis of rock samples is clearly different from the surface analysis. What effect does this have on the rock properties?

PLEASE double and triple check your answers and help me with all the parts. There are two parts attached as 2 screenshots.

You were asked to watch a video where a small amount of water was placed into a can on a hot plate. After time, it was inverted into ice water. Why did the can implode? Edit View Insert Format Tools Table 12pt v Paragraph v |BIUAv D2

A composite material reinforced with aligned fibers, consisting of 20% by volume of silicon carbide (SiC) fibers and 80% by volume of polycarbonate (PC) matrix. The mechanical characteristics of the 2 materials are in the table. The stress of the matrix when the fiber breaks is 45 MPa. Calculate the longitudinal strength? SiC PC Elastic modulus (GPa) Tensile strength (GPa) 400 2,4 3,9 0,065

a statement about the scale of plastic production and how this has changed over time using simple lanaguge becsuse it is writte for kids.    a statement about the scale of plastic production and how this has changed over time using complex lanaguge.

What are the differences between crazes vs. cracks in polymer? Can you still use polymeric materials if there are crazes or cracks occurs?

Choose an example of polymorphs. a.graphite and graphine b.diamond and adamant c.pyrite and gold d.graphite and diamond e.galena and halite

Fill in the blanks: Silica ____ has a larger surface area than particle type ___

What materials will the teacher and the students need to complete a lesson on mixing substances in a 5th grade classroom based on the below standard and learning objective? Standard Conduct an investigation to determine whether the mixing of two or more  substances results in new substances.  Learning Objective Given a variety of substances and safety equipment in a classroom setting, students will be able to conduct an experiment to mix two or more substances and observe the results. They will be able to correctly identify whether a new substance has been formed as a result of the mixing, based on observable changes such as color change, formation of a precipitate, or change in temperature, with at least 80% accuracy.

What are some advantages and disadvantages of vitreous silica and soda-lime glass?

1) Using the formulas in this lab module for various shapes, calculate the volume of a solid ball made of concrete whose radius from core to outward point is 45mm. Show all work. smulov sr heqxe how lle won2 lig

By the means of gas stoichiometry, how deodorants are created?