AnswersHSBIO Biology Sem 1 26-27Lab: Identifying Nutrients

Lab: Identifying Nutrients — Unit test Answers

0 verified answers1 views
1
Free Preview

There are more hydrogen atoms in living organisms than any other atom, but oxygen is more abundant in terms of mass. Why is this statement true?

A
Hydrogen is a gas, but oxygen is a solid.
B
Hydrogen atoms have a lower mass than oxygen atoms.
C
Hydrogen atoms make up more of water's mass than oxygen atoms.
D
Hydrogen is present as single atoms and oxygen is bonded in compounds.
2
Free Preview

How does a catalyst influence a chemical reaction?

A
It speeds up or slows down a chemical reaction by direct participation.
B
It reacts with products to increase the concentration of reactants.
C
It decreases the amount of energy necessary for the reaction to proceed.
D
It increases the total amount of products formed.
3

A scientist is working with methane (CH4) and butane (C4H10). Which statement best compares these chemicals?

A
They are two different types of molecules that each contain the same number of atoms.
B
They are two different types of atoms that are each made up of a different number of elements.
C
They are compounds made of the same two elements, but each contain different numbers of atoms.
D
They are matter made of the same two compounds, but each contain different types of elements.
4

Which statement describes how enzymes and substrates are related?

A
The enzyme influences the speed of change from substrate to product.
B
Enzymes are released as substrates in a chemical reaction.
C
An enzyme is a special kind of substrate in a chemical reaction.
D
Substrates combine with enzymes to form reactants.
5

A doctor suspects that one of her patients has a deficiency in one of the six key elements found in living organisms. He has low energy and extremely weak, soft bones. Based on this information alone, which nutrient supplement will she most likely prescribe?

A
phosphorus
B
zinc
C
sodium
D
sulfur
6

Which reaction is exothermic?

A
a reaction that absorbs energy from the environment
B
a reaction that requires an activation energy
C
a reaction that releases energy into the environment
D
a reaction that does not involve a change in energy
7

Which component is affected when a catalyst is added to a chemical reaction?

A
the amount of substrate
B
the activation energy
C
the amount of product
D
the concentration of reactants
8

Read the following information from a Material Safety Data Sheet (MSDS) about the chemical hydrochloric acid (HCl).“Skin Contact: In case of contact, immediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Thoroughly clean shoes before reuse. Get medical attention immediately.”Based on this information, which is the most important thing to do right away if a student spills HCl on his shirt?

A
Remove the shirt, and rinse the skin with water.
B
Remove the shirt, and find a sink to rinse it in.
C
Get help from a classmate immediately.
D
Call 911 to get medical attention immediately.

Did you find these answers helpful?

More from this Course

Quiz
15 verified answers

Unit Test

Quiz
9 verified answers

Unit Test

Quiz
25 verified answers

Prokaryotic and Eukaryotic Cells

Lab: Identifying Nutrients — Unit test Answers —…