chem

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what best describes cosmetics

what best describes cosmetics

any substance used to clean, improve or change the complexion, skin, hair, nails, or teeth.

how do you categorize lipstick

sticks

.   What is the adverse effect in prolong exposure to harmful cosmetics?

.What are the preservatives used in cosmetics

• parabens

• BHA, BHT

• Formaldehyde

.   Factor to consider before buying cosmetics.

• Ingredients

• Brand

• Skin Type

• Price

. How do you describe soap?

a cleansing and emulsifying agent made usually by action of alkali on fat or fatty acids and consisting essentially of sodium or potassium salts of such acids

.   What is the chemical formula for lye?

The chemical formula for lye is NaOH. Sodium Hydroxide

.   Describe hydrophobic.

Hydrophobic refers to the property of a substance that repels water or does not mix with water. This term is commonly used in chemistry and biology to describe molecules or materials that are nonpolar or have low polarity, which makes them insoluble or poorly soluble in water. Examples of hydrophobic substances include oils, fats, and waxes.

.Chemical commonly used in deodorants.

Aluminum Chloride

.   Why soap cannot be used in hardwater?

It produces soap scum

.   How detergents likely to be with branched hydrocarbons?

.Detergents with branched hydrocarbon chains are less likely to be biodegradable, that is they are not broken down by the bacteria easily. Thus, they cause water and soil pollution. All the soaps, on the other hand, are

biodegradable.

What is a dye?

a natural or synthetic substance used to add a color to or change the color of something.

.What is the type of cosmetics?

• gels

• ointments

• suspensions

• sticks

• emollients

• powders

• aerosols

• creams

.How are dyes develop?

.The majority of natural dyes are derived from non-animal sources: roots, berries, bark, leaves, wood, fungi, and lichens. In the 21st century, most dyes are synthetic, i.e., are man-made from petrochemicals. Some are extracted from insects and or minerals. Synthetic dyes are produced from various chemicals.

.   How do you describe insect repellent?

.agents that are used to protect the body from the bites of insects that can cause local or systemic effects.

.   What are examples of chromophore?

.Common examples include retinal (used in the eye to detect light), various food colorings, fabric dyes (azo compounds), pH indicators, lycopene, β-carotene, and anthocyanins.

. What are the properties of dye?

1. absorb light in the visible spectrum (400–700 nm),

2. have at least one chromophore (colour-bearing group),

3. have a conjugated system, i.e. a structure with alternating double and single bonds, and

4. exhibit resonance of electrons

.   What insect repellent has low risk level to the environment?

Insect repellents that contain DEET, Picaridin, or IR3535 have been found to have low risk levels to the environment. However, it is still important to follow the instructions on the label and use these products responsibly.

.   How insect repellent works?

Insect repellents work by masking the human scent that attracts insects, such as mosquitoes and ticks. They contain chemicals that interfere with the insect's ability to detect the human scent, making it less likely for them to bite. Some repellents also contain chemicals that are toxic to insects, which can kill or repel them. It is important to follow the instructions on the repellent label and use it properly to ensure maximum effectiveness.

.    How insect repellent used?

Insect repellent is typically applied to the skin or clothing to deter insects from biting or landing on the treated area. It can also be used in the form of sprays, lotions, or candles to create a barrier between humans and insects.

What insect repellent are commonly used?

Commonly used insect repellents include DEET, picaridin, IR3535, and oil of lemon eucalyptus.

In what ways are pheromones released?

.Pheromones are chemical substances which may be secreted in urine, dung or produced by special glands. They are usually given off by the female of the species to attract males.

.23. What is the property of carbon fiber?

-Carbon fibers generally have excellent tensile properties

- low densities, high thermal and chemical stabilities in the absence of oxidizing agents,

-good thermal and electrical conductivities,

-and excellent creep resistance.

.   Why carbon steel is ideally weldable?

it is easy and cheap to weld. It contains 0.3 percent of carbon. With low carbon content, weldability increases

.   Why carbon fiber is suitable in sporting goods?

.primarily due to their advanced properties such as light weight, high strength to weight ratio, improved resistance, and stiffnes

Why carbon fiber is useful in medical applications?

radiolucent properties make it an ideal material for medical imaging devices, scanner devices, and other parts used in x-ray imaging applications. Radiation does not change the properties or dimensions of carbon fiber products, making it completely safe when used in vital components for implants.

.27. How ceramics are made?

Making mixtures of clay, earthen elements, powders, and water and shaping them into desired forms.

How alloys are converted to industrial uses?

only when they are mixed together that they are converted from chemical curiosities into useful materials. Alloys are used to create steels with fixed formulas in order to create suitable materialas.

With what culture does ceramics, like stoneware and porcelain first produced?

Chinese

How traditional ceramics are made?

Are comprised of three basic components - clay, silica (quartz), and feldspar.

Is carbon a ceramic

No

.5. Which of the following processes I not needed for making a synthetic diamond?

a) Application of high temperature \n b) Application of high pressure \n c) Chemical vapor deposition \n d) All of the above

All of the above

.6. Which of the following can be used for lubrication?

a) Graphite \n b) Diamond \n c) Brass \n d) Bronze

A

.7. Graphite is a good conductor of electricity.

a) True \n b) False

A

.