Tag: science & technology

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Questions Related to science & technology

Multiple choice general knowledge science & technology

The chemical properties of matter comes mostly from its

  1. Neutrons

  2. Valence electrons

  3. Protons

  4. Neucleous
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chemical properties are determined by how atoms interact during chemical reactions, which involves electron transfer or sharing. Valence electrons (outermost electrons) participate in bonding and chemical reactions, making them primarily responsible for chemical behavior.

Multiple choice general knowledge science & technology

An excited atom decays to its ground state and emits a photon of green light. If instead, the atoms decays to an intermediate state, then the light emitted could be:

  1. Violet

  2. White

  3. Blue

  4. Red
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Photon energy is inversely proportional to wavelength - larger energy jumps produce shorter wavelength (higher energy) light. Green light results from a large energy drop from excited to ground state. An intermediate drop represents a smaller energy change, so it must have longer wavelength than green.

Multiple choice general knowledge science & technology

Which experiences the least electrical force in an electric field?

  1. Electron

  2. Beta particle

  3. Gamma ray

  4. Alpha particle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Electrical force affects only charged particles. Gamma rays are electromagnetic waves (photons) with no electric charge, so they experience no electrical force. Alpha particles (2+), beta particles (1-), and electrons (1-) are all charged and would be affected.

Multiple choice general knowledge science & technology

Sugar is not infinitely soluble in water because:

  1. when you mix enough sugar into water the solution eventually solidifies.

  2. of the strong attractions that occur between sugar molecules

  3. of the strong attractions that occur between water molecules

  4. there is only so much space between water molecules for sugar molecules to fit
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Solubility has a physical limit because water molecules occupy finite space. Once all available spaces between water molecules are filled, additional sugar molecules cannot fit in. This saturation point creates the solubility limit.

Multiple choice general knowledge science & technology

Covalent and ionic bonds differ in that:

  1. ionic bonds don't involve the sharing of electrons

  2. covalent bonds are more permanent

  3. covalent bonds are much less common

  4. ionic bonds are electrical by nature
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ionic bonds involve complete electron transfer from one atom to another, creating oppositely charged ions that attract electrostatically. Covalent bonds involve electron sharing between atoms. This fundamental difference in electron behavior is what distinguishes the two bond types.

Multiple choice general knowledge science & technology

The outer shells of two atoms that are covalently bonded:

  1. cancel each other

  2. have increasing capacities for electrons

  3. overlap

  4. repel
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In covalent bonding, atoms share electrons by overlapping their outermost orbitals. This electron cloud overlap allows shared electrons to be attracted to both nuclei simultaneously, creating the bond. The valence shells effectively merge in the bonding region.