Answer:
Volume of the sulfuric acid (25cm³), same mass of each metal (1g)
Explanation:
In an experiment, the CONTROL VARIABLE also known as constant is the variable that is kept unchanged for all groups in an experiment. This is done in order not to influence the outcome of the experiment.
In this case, students are trying to investigate the reactivity of four different metals. They added 1 g of each metal to 25cm³ of sulfuric acid and recorded the temperature change. Based on the explanation of control variable above, the VOLUME OF SULFURIC ACID (25cm³) and the MASS OF EACH METAL (1g) are the CONTROL VARIABLES because they are the same or unchanged in this experiment.
That would be <span>Johannes Gutenberg a German inventor from the 1400's </span>
25 m/s I believe because you are looking for t and if you changed the formula to t=s(d) or just keep the formula how it is and multiply to cancel out d you would be left with 5(5) so 25m/s
The two different mineral elements that a fertilizer can contain are:
- Phosphorus - build up of nucleic acid and ATP
- Nitrogen- synthesis of proteins
<h3>What are fertilizers?</h3>
Fertilizers are chemical substances added to the soil in order to improve crop growth and development.
Fertilizers are artificially made to contain mineral elements that are needed by the plants. Some of the mineral elements are as follows:
- Phosphorus
- Nitrogen
- Pottasium
- Phosphorus helps in the build up of nucleic acids and ATP for energy.
- Nitrogen is useful in the synthesis of proteins.
Learn more about minerals at: brainly.com/question/18078524
Air is a mixture
hope this helps :)