Grade 10 Chemistry Assessment Prep: Animals and Chemical Processes

Animals Assessment Prep

Grade 10 Chemistry Animals Assessment Prep Advanced 20 Questions 12 Views

Classroom Worksheet

Grade 10 Chemistry Assessment Prep: Animals and Chemical Processes

Animals Assessment Prep

Name____________________________

Date________________

Score______ / 20

Grade: Grade 10

Subject: Chemistry

Topic: Animals

Time: 20 Minutes

Difficulty: Advanced

Questions: 20

Instructions:
Answer all 20 questions. Show your reasoning where needed. Use complete sentences for written responses and include units in calculations. Questions increase in difficulty.

Skills Practiced:

Animals
Chemistry
Critical Thinking
Problem Solving

1Question

What is the main chemical component of animal bones and teeth that gives them hardness?

2Question

Name one element that is essential in animal proteins and one element that is common in animal fats.

3Question

Animals release carbon dioxide during which process?

4Question

What type of biomolecule is an enzyme, and what is its general function in animals?

5Question

Why is water important in animal cells from a chemical perspective? Give one reason.

6Question

An animal diet low in iron may affect the transport of oxygen. Which molecule in blood contains iron and carries oxygen?

7Question

State one chemical difference between saturated and unsaturated fats.

8Question

During digestion, large food molecules are broken into smaller molecules. What type of chemical reaction usually occurs in digestion?

9Question

Why do animals need minerals such as calcium and phosphorus in their diet?

10Question

Explain why proteins are important for growth and repair in animals.

11Question

An athlete’s body needs quick energy. Which type of nutrient is usually broken down first for rapid energy release, and what simple sugar is directly used in respiration?

12Question

A student tests an unknown animal food sample and finds it contains many peptide bonds. What class of nutrient is present?

13Question

How does an increase in lactic acid in muscles relate to oxygen supply?

14Question

Calculate the approximate percentage of water in a mammal’s body if 66 kg of a 75 kg animal is water. Show your answer as a percentage.

15Question

Why can’t animals get energy directly from minerals such as calcium or iron in the same way they get energy from glucose?

16Question

A dog’s cells use oxygen to break down glucose. Write the word equation for aerobic respiration in animals.

17Question

A species of fish lives in very cold water. Predict one chemical adaptation in its cell membranes that would help maintain membrane function.

18Question

Explain why enzymes in animals have an optimum temperature and how temperature affects their activity beyond that point.

19Question

A scientist measures the rate of oxygen consumption in an animal before and after exercise. Why does oxygen consumption increase after exercise?

20Question

A student claims that fats are less useful than carbohydrates because they do not contain oxygen. Evaluate this claim using chemistry knowledge about animal nutrition.

Answer Key

#	Answer
1	Calcium phosphate, mainly in the form of hydroxyapatite.
2	Protein commonly contains nitrogen; fats contain carbon, hydrogen, and oxygen. One valid answer: nitrogen in proteins and carbon in fats.
3	Cellular respiration.
4	An enzyme is a protein that acts as a biological catalyst to speed up chemical reactions.
5	Water is a good solvent and allows many chemical reactions and transport processes to occur in cells.
6	Hemoglobin.
7	Saturated fats have no carbon-carbon double bonds, while unsaturated fats have one or more carbon-carbon double bonds.
8	Hydrolysis.
9	They are needed to build and maintain bones and teeth and support other body functions such as nerve and muscle activity.
10	Proteins provide amino acids, which are used to build new cells and repair damaged tissues.
11	Carbohydrates; glucose.
12	Protein.
13	It usually means oxygen supply is insufficient for aerobic respiration, so muscles partially switch to anaerobic respiration.
14	(66 ÷ 75) × 100 = 88%. The animal is approximately 88% water.
15	Minerals are not energy-containing organic molecules; glucose can be oxidized in respiration to release energy, but minerals cannot.
16	Glucose + oxygen -> carbon dioxide + water + energy.
17	A higher proportion of unsaturated fatty acids in membrane lipids to keep membranes fluid in cold temperatures.
18	Enzymes have a specific shape needed for function. As temperature rises to the optimum, reactions speed up; above the optimum, the enzyme may denature and the active site changes shape, reducing activity.
19	After exercise, muscles need more ATP for recovery and continued activity, so cellular respiration increases and more oxygen is used.
20	The claim is incorrect. Fats do contain oxygen, though less than carbohydrates. Fats are important because they provide a concentrated energy store, insulation, and help form cell membranes. Their usefulness depends on their chemical properties and biological roles, not on lacking oxygen.