Homework - Y7 W1 - Chemical reactions
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Slide 1 - Tekstslide
Slide 2 - Tekstslide
Slide 3 - Tekstslide
What is the process in which one or more substances are changed into one or more different substances?
A
Combustion
B
Chemical reaction
C
Physical reaction
D
Biological reaction
Slide 4 - Quizvraag
Which of the following is an example of a chemical reaction?
A
Mixing salt in water
B
Boiling water
C
Burning of wood
D
Melting of ice
Slide 5 - Quizvraag
In a chemical reaction, what are the substances present at the beginning called?
A
Reactants
B
Catalysts
C
Products
D
Inhibitors
Slide 6 - Quizvraag
In a chemical reaction, what are the substances at the end of the reaction called?
A
Reactants
B
Catalysts
C
Products
D
Inhibitors
Slide 7 - Quizvraag
What is the process in which one or more substances are changed into one or more different substances?
A
Combustion
B
Chemical reaction
C
Physical reaction
D
Biological reaction
Slide 8 - Quizvraag
The start of the reaction the chemicals are called...
A
Products
B
Reactants
Slide 9 - Quizvraag
What does not change during a chemical reaction
A
The products made
B
The total number of products
C
The total number of atoms each element
D
The total number of reactants.
Slide 10 - Quizvraag
The end of the reaction the chemicals are called...
A
Products
B
Reactants
Slide 11 - Quizvraag
What factors can affect the rate of a chemical reaction?
A
Temperature
B
Volume
C
Concentration
D
Surface Area
Slide 12 - Quizvraag
What is the process of rearranging atoms in a substance called?
A
Molecular transformation
B
Chemical reaction
C
Atomic shuffling
D
Elemental reorganization
Slide 13 - Quizvraag
What happens to the rate of a chemical reaction when the temperature is increased?
A
The rate of reaction decreases
B
The rate of reaction remains the same
C
The rate of reaction becomes unpredictable
D
The rate of reaction increases
Slide 14 - Quizvraag
In a chemical reaction, what does the conservation of mass imply about the total mass of the reactants and products?
A
It doubles
B
It remains the same
C
It quadruples
D
It halves
Slide 15 - Quizvraag
Which of the following is a physical change?
A
Boiling water
B
Melting ice
C
Rusting iron
D
Burning wood
Slide 16 - Quizvraag
What happens to the chemical composition during a physical change?
A
It changes completely
B
It remains the same
Slide 17 - Quizvraag
Which of the following is an example of a physical change in matter?
A
Mixing salt and water
B
Burning paper
C
Digesting food
Slide 18 - Quizvraag
What is the state of matter changes in a physical change?
A
The state remains constant
B
The state may change
Slide 19 - Quizvraag
Which of the following describes a physical change?
A
Change in size
B
Change in shape
C
Change in color
D
Change in odor
Slide 20 - Quizvraag
Slide 21 - Tekstslide
Which enzyme is used in the COVID tests to turn RNA into DNA
A
Transcriptase
B
Tripase
C
Triptilase
D
Reverse transcriptase
Slide 22 - Quizvraag
By repeatedly heating and cooling DNA with a primer, the DNA building enzyme makes millions of copies of
A
Cell DNA
B
Host DNA
C
Virus DNA
D
Primer
Slide 23 - Quizvraag
Fluorescent dye molecules bind to the virus DNA as it is copied. Binding them makes them give off more light, which is used to....
A
Confirm the presence of the virus
B
Confirm the absence of the virus
Slide 24 - Quizvraag
Tests which are in development are looking for
A
Proteins on the surface of the bacteria
B
Proteins on the surface of the protist
C
Proteins on the surface of the virus
D
Proteins on the surface of the fungi
