EOT G12 Biology Revision Term 1

Multiple Choice

Attractions between water molecules are called

• Covalent bonds
• Ionic bonds
• Polar bonds
• Hydrogen bonds

Multiple Choice

What type of charge does oxygen have in a water molecule?

• negative
• positive
• neutral

Multiple Choice

The __________________ is a property of a system in which two points have opposite characteristics, such as charges (positive/negative) or magnetic poles.

• polarity

• opposites

• cohesion

• adhesion

Multiple Choice

Water molecules are polar molecules. What is meant by the term polar molecule?

• a molecule that has no charge on one end and either an overall negative or positive charge on the other end

• a molecule that has an overall positive charge on one end, as well as an overall positive charge on the other end

• a molecule that has an overall negative charge on one end, as well as an overall negative charge on the other end

• a molecule that has an overall positive charge on one end and an overall negative charge on the other end

Multiple Choice

A water molecule contains two hydrogen atoms and one oxygen atom. Which of the following statements about water molecules is true?

• The oxygen atom is negatively charged and the hydrogen atoms are positively charged.

• The oxygen atom is positively charged and the hydrogen atoms are negatively charged.

• All of the atoms have a negative charge.

• All of the atoms have a positive charge.

Multiple Choice

A water strider can skate along the top of a pond because:

• covalent bonds result in water cohesion
• hydrogen bonds result in water cohesion (surface tension)
• water striders have adapted to take advantage of water cohesion
• low surface tension of water

Multiple Choice

Why can water have no net charge but have slight charges in different parts of the molecule?

• The oxygen end is slightly negative and the hydrogen end is slightly positive
• The hydrogen end is slightly negative and the oxygen end is slightly positive
• The hydrogen and oxygen ends change in polarity
• Because it is hydrophobic

Multiple Choice

Attractions between water molecules are called

• Covalent bonds
• Ionic bonds
• Polar bonds
• Hydrogen bonds

Multiple Choice

6. Your science teacher showed in class a bowl of fruit and vegetables

salad. Your classmate examined the mixture and was able to

distinguish fruits from vegetables. What type of mixture was presented

by your teacher?

• A. colloid

• B. heterogeneous (Non-Uniform)

• C. homogeneous (Uniform)

• D. solution

Multiple Choice

Oil and water

• Homogeneous Mixture

• Heterogeneous Mixture

Multiple Choice

Saliva is

• Homogenous

  mixture

• Heterogeneous

  mixture

Multiple Choice

Air is a solution of gases so it is

• Homogeneous

  mixture

• Heterogeneous

  mixture

Multiple Select

Which is a heterogenous mixture

• sand and water

• drink mix in water

Multiple Choice

The pH scale is used to know what?

• Your temperature

• Know one knows

• The colors of acids and bases

• The strength of acids and bases

Multiple Choice

Acids have a pH of _______________.

• below 7

• above 7

• exactly 7

Multiple Choice

Bases have a pH of _______________.

• below 7

• above 7

• exactly 7

Multiple Choice

Neutral solutions have a pH of _______________.

• below 7

• above 7

• exactly 7

Multiple Choice

What ions are there more of in acidic solutions?

• H+ (H3O+)

• OH-

Multiple Choice

What ions are there more of in basic solutions?

• H+ (H3O+)

• OH-

Multiple Choice

Substance with Hydrogen ion is

• acidic solution

• Basic solution

Multiple Choice

Substance with Hydroxyl ion is

• acidic solution

• basic solution

Multiple Select

which of the following is a physical change?

• A

• B

• C

• D

Multiple Choice

what is shown in the image?

• amino acid

• nucleotide

• glucose

• protein

Multiple Choice

In an endothermic reaction, heat is ...

• taken in

• given out

Multiple Choice

In an exothermic reaction, heat is ...

• taken in
• given out

Multiple Choice

If a chemical reaction is EXOTHERMIC, the temperature would....

• Stay the same
• Increase
• Decrease

Multiple Choice

Baking bread and cooking an egg are examples of....?

• Endothermic processes
• Exothermic processess
• None of these 

Multiple Choice

What type of reaction is shown in the photo?

• Exothermic
• Isothermic
• Endothermic
• None of the  above

Multiple Choice

$$O_2\left(g\right)\ +\ 2\ H_2\ \left(g\right)\ \rightarrow\ 2\ H_2O\ \left(g\right)\ +\ Energy$$  

• endothermic

• exothermic

Multiple Choice

What does this image shows?

• Chemical reaction

• isotopes

• elements

• polar moleules

Multiple Choice

In which of the following are bonds broken and new bonds are formed?

• chemical reactions

• isotopes

• elements

• polar molecules

Multiple Choice

A chemical reaction is a process by which atoms or groups of atoms in substances are

• Reorganized into different substances

• Dissolved in other substances

• Mixed together with atoms in other substances

• Ionized by the loss of protons

Multiple Choice

What does this image show?

• covalent bond

• physical property

• Van der waals forces

• chemical reaction

Multiple Choice

Is water a polar or a non-polar molecule? 

• Polar
• Non-polar

Multiple Choice

Energy needed to get a reaction started is called

• activation energy.

• Power Energy

• Nuclear Energy

• None

Multiple Choice

Look at the figure. Determine what the upward curve represents.

• Activation energy

• reactants

• products

• enzymes