B1 Cells
Which cell structure controls the activities of the cell?
Nucleus
What type of pathogen causes measles?
Virus
Is combustion an exothermic or endothermic reaction?
Exothermic
What is the unit for energy?
Joule
What are the 3 types of variables?
Independent
Dependent
Control
Which cell structure controls what goes in and out of a cell?
Cell membrane
What type of organism gets AFFECTED by TMV?
Plants
What happens to the temperature of the surroundings during an endothermic reaction?
A light bulb has a power rating of 60 W and is switched on for 300 s. How much energy is transferred?
18 000 J
What do we call data points that don't fit the pattern and are likely results of random error?
Anomalies
Which cell structure is the place where aerobic respiration takes place?
Mitochondria
What is the body's first line of defence against pathogens?
Skin and mucus in respiratory system
Sketch the reaction profile of an endothermic reaction
There are 10 forms of energy (stores and transfers) - name them
Magnetic, Kinetic, Heat, Light, Gravitational Potential, Chemical, Sound, Elastic Potential, Electrical, Nuclear
What do you do with an anomalous point when drawing a graph and line of best fit?
Ignore it when drawing a line of best fit
Name the 3 cell structures that are in plant cells but not animal cells and what they do
Cell wall - shape
Vacuole - storage
Chloroplast - photosynthesis
Why would you not use antibiotics for a cold?
Antibiotics kill bacteria, a cold is a virus
Sketch the reaction profile of an exothermic reaction, but label it with activation energy
What is the type of energy in a battery?
Chemical
A student is working with dilute acids in a practical. They have an exclamation mark as their hazard symbol. Give the hazard, risk, and control measure
Hazard - Acid is an irritant
Risk - Can get on you and irritate your eyes
Control measure - Wear goggles
Give me 2 features of the villi that lead to faster diffusion
Thin walls
Large surface area
Give a BRIEF overview of what happens at each of the 3 stages of drug development (1 sentence max, include what gets tested on)
1) Pre-clinical (testing on animals to check for danger)
2) Testing on healthy volunteers for small doses to check side effects and danger
3) Testing on people with the disease in double-blind test
A reaction requires 850 kJ/mol to break bonds and releases 1100 kJ/mol when new bonds form. Is the reaction exothermic or endothermic? Calculate the overall energy change.
A crane lifts a 500 kg load through a height of 8 m in 25 s. Calculate the power output of the crane.
1568 W
A student wants to test how the resistance of a wire is affected by the wire's length. Give the 3 variables of this experiment
Independent - Length of wire
Dependent - Resistance
Control - Temperature of wire, thickness of wire