Which of the following is a heterogeneous mixture?A. Oil and Vinegar
B. Air
C. Milk
D. Vinegar in water

Answers

Answer 1

Answer:

Answer:

Explanation:

b/c air is not seen by eye

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One group of scientists has proposed a new theory on Adaptation. A majority of scientists worldwide agree with the theory. The theory is most likelyA.biased. B.incomplete. C.accurate. D.unchangeable.

Which radioisotope has the fastest rate ofdecay?
(1) 14C
(2) 37Ca
(3) 53Fe
(4) 42K

Answers

The correct answer is 2. 37Ca.

The fastest rate of decay in radioisotope is 37Ca. Another name for radioisotope is radioactive of isotopes which are of given element.

The different number of neurons and the same number of protons are present on the same element with different isotopes. Radioisotopes are considered to have an unstable combination of neutrons and protons.

The correct answer to this question is (2) 37Ca . The radioisotope that has the fastest rate of decay is 37Ca. Radioisotope or also known as radioactive isotopes of a given element. Same number of protons but different number of neurons are present on different isotopes of the same element. They are considered as atoms that have unstable protons and neutrons combination.

Which best describes an element? a pure substance a type of a mixture a pure compound an impure substance

Answers

An element is a pure substance. It is the purest and most basic form of any substance on Earth. There are a total of 118 discovered elements, 94 of which naturally occur on Earth. The 24 other elements are synthetic or man-made. Elements are atoms that are made of subatomic particles known as protons, electrons, and neutrons.

Answer:

an element is a pure substance

Explanation:

If a sound wave refracts, what happens to it? Select all that apply.It changes its speed and wavelength when it bounces off of a solid surface.
B
It changes direction when it passes through an opening
С
It changes its speed and wavelength when it passes through an opening
D
It changes direction when it passes from one medium to another
E
It changes its speed and wavelength from one medium to another.
F
It changes direction when it bounces off of a solid surface.

Answers

If a sound wave refracts,It changes its speed and wavelength when it bounces off of a solid surface,It changes its speed and wavelength when it passes through an opening, and It changes direction when it passes from one medium to another. Therefore, option A, C and D are correct.

What is refraction of sound wave ?

An important case in which sound waves change form or spread out is called refraction. This phenomenon affects the bending of a sound wave owing to changes in the wave's speed.

Refraction is the reason ocean waves near a shore parallel to the beach and why glass lenses can be used to focus light waves.

If the air above the earth is warmed than that at the surface, sound will be change shape back downward toward the surface by refraction. Soundpropagates in all directions from a point source.

Thus, option A, C and D are correct.

To learn more about the refraction of sound wave, follow the link;

brainly.com/question/17227614

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The answer is a and c and d

Prehistory can be described as _____.what happened last year
what happened millions of years ago
the time prior to the use of written records

Answers

The way we usually think of history is the time of written records; or similar records(auditory, video) when we have direct evidence of what happened as opposed to reconstructing it from archaeological evidence. Pre-history is the time before this: the time prior to the use of written records

The grouping element, ul, contains the definition associated with a term from a description list. True False

Answers

Answer:

False is your answer

Final answer:

The statement is false. The <ul> element is for unordered lists, while the <dl> elements along with <dt> and <dd> are used for description lists in HTML.

Explanation:

The statement that the grouping element, <ul>, contains the definition associated with a term from a description list is false. In HTML, the <ul> element is used to create an unordered list, typically represented by bullet points. The definitions associated with terms in a description or definition list are contained within a <dl> element. Within this <dl> element, each term is denoted by a <dt> (description term) element, and the corresponding definition is provided within a <dd> (description details) element. It's important to use these specific elements to ensure proper semantics and accessibility on the web.