1. What is the wave speed of a wave that has a frequency of 100 Hz and a wavelength of 0.30 m?

So,

There are two basic types of changes in chemistry: physical changes and chemical changes.

Physical changes do not change the chemical identity of the substance; instead physical changes operate between molecules/atoms/ions/etc.  Changes of phase and separation of different substances in a mixture are examples of physical changes.  For example, when you change the phase of liquid water to gas, you are operating between the water molecules by breaking the intermolecular attractions.  Yet you still have water, H2O.  When you separate iron filings from a mixture of sand and iron filings with a magnet, you are, in a way, operating between the atoms of iron.  Yet you still have iron and sand.

Chemical changes change the chemical identity of the substance.  When you throw salt into water, the salt dissolves and is no longer salt.  You get salt water, which is chemically different from water and salt.  You have operated inside the salt compound.

Thus, changing matter from one form to another without a change in chemical properties would be a physical change.

Among the substances listed, ammonia (NH3) is a compound. The option D (ammonia) is the correct option.

Compound Substance

• A compound substance refers to a type of substance that is composed of two or more different elements chemically combined in fixed proportions. In other words, it is a substance formed when atoms of different elements bond together to form molecules. The elements in a compound substance are chemically bonded, meaning they are held together by chemical forces such as covalent bonds, ionic bonds, or metallic bonds.

Compounds can have various physical forms, such as solids, liquids, or gases, depending on the specific elements and the nature of their chemical bonds. They can also exhibit a wide range of chemical and physical properties, such as melting point, boiling point, density, solubility, and reactivity.

Chemical formulas are used to represent compound substances, indicating the types and numbers of atoms present in a molecule of the compound. For example, the chemical formula for water is H2O, representing two hydrogen (H) atoms bonded to one oxygen (O) atom. Ammonia is composed of nitrogen (N) and hydrogen (H) atoms bonded together. Carbon (C), chlorine (Cl), and uranium (U) are elements rather than compounds.

Therefore, Ammonia which is option D is the correct option.

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Answer:

Ammonia

Explanation:

Ammonia is a inorganic compound that is made up of single nitrogen atom.

All the glands do release quite a lot of hormones that have different functions. They are discussed below.

Explanation:

Pituitary gland is called the orchestra of endocrine system of human body. It secretes a lot of hormones namely

A. Growth hormone - it acts all over the body, helping in overall growth.

B. Thyroid Stimulating Hormone - acts on Thyroid gland, stimulating the release of Thyroid hormones.

C. Follicle Stimulating Hormone - Acts on germ mother cells to produce new cycles in females and new sperms in males.

D. Adreno Cortico Trophic Hormone - Acts on adrenal cortex gland helps in secretion of its hormones.

E. Luteinizing hormone - acts on interstitial cells of Leydig cells in males and corpus luteum in females to secrete testosterone and progesterone respectively.

F. Prolactin - it acts on mammary glands to secrete breast milk.

G. Oxytocin - it helps in labour and acts on uterine muscles.

H. Vasopressin - it acts on kidneys to reabsorb water.

Thyroid glands secrete Thyroxine and triiodothyronine acting on all cells of body for overall growth.

Adrenal Cortex secrete cortisol acting on all body cells, angiotensin and aldosterone acting on kidneys. Adrenal Medulla secretes adrenaline, nor adrenalin and dopamine which also acts on all body cells.

Pancreas secretes insulin, glucagon and somatotrophin which acts on all body cells, mainly muscle cells and adipocytes.

Ovary secretes Oestrogen, and progesterone acting on mainly all body cells, mainly in uterus.

Testis secretes testosterone which acts on all body, mainly on sperm mother cells.

Answer:

  D. Something that pushes the experimental results one way or another

Explanation:

Bias is the tendency of a measurement or outcome to be consistently different from what it would be if all preconceived notions or irrelevant influences were removed. It pushes experimental results one way or another.

Answer:

D.Somethingthatpushestheexperimentalresultsonewayoranother.