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Yanka [14]
3 years ago
8

what is the correct definition of refraction? 1. A change in the direction of light when it goes from one medium into a differen

t medium. 2. light passes though an object without being affected by that object. 3. when light strikes an object, it doesn’t pass through and it does not change direction. 4. light bounces back from an object at the same angle and intensity that the object received it.
Chemistry
2 answers:
elena-14-01-66 [18.8K]3 years ago
7 0

Answer: The answer is A

Explanation:

serious [3.7K]3 years ago
5 0

im pretty sute the answer would be number 4.

mark brainliest  :)

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A small amount of a solid is added to water. The observation made after fifteen minutes is shown in the figure. Which of these s
natulia [17]

Answer:

B) sand

Explanation:

A) Oil is a wrong choice because it is a liquid not a solid and also if it is oil, it will float over the water surface as a droplets.

B) Sand is the right choice, because sand is a solid and it does not dissolve in water and stabilizes at the bottom.

C) Sugar is a wrong choice, because small amount of sugar will dissolve in water and be a homogeneous solution and does not appear as a particles.

D) Wood ships is also a wrong choice, even it is a solid and does not dissolve in water, but it will float over the water surface.

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How many electrons, protons, neutrons, and what is the atomic number and atomic mass (if any) does Fluoride have?
ExtremeBDS [4]
Fluoride is an anion of Fluorine

What this means is that the two have the same number of protons (9), but Fluoride has 10 electrons compared to Fluorine's 9.

So the answers are:
Protons - 9
Neutrons - 9
Electrons - 10
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5 0
3 years ago
Read 2 more answers
Why do ionic compounds have high melting points?
Vika [28.1K]
These oppositely charged compounds are strongly held by electrostatic forces of attraction as these be together for a long time the rise in temparature occurs so that the the melting points rises in them.
4 0
3 years ago
The change in enthalpy is the change in heat energy of a reaction and is calculated by (Hint: Hess' Law): Group of answer choice
Stolb23 [73]

Answer:

d. Sum of product enthalpies minus the sum of reactant enthalpies

Explanation:

The standard enthalpy change of a reaction (ΔH°rxn) can be calculated using the following expression:

ΔH°rxn = ∑n(products) × ΔH°f(products) - ∑n(reactants) × ΔH°f(reactants)

where,

ni are the moles of products and reactants

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E. Traits are inherited when genes are passed from parents to offspring
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