A science student was tested to investigate the reaction between an acid and a metal. he put on aluminium into a test tube containing hydrochloric acid. questions
1. write a chemical reaction for the above chemical reaction

2. name the products that will be produced from the above reaction

3. name three metals that will behave an aluminium in an acid

4. state two uses of the above chemical reaction (in question 1)​

Select the correct answer from each drop-down menu.describe what happens to a carbon-11 atom when it undergoes positron emission.the decay of a carbon-11 atom _1_, and this causes it to emit _2_.options for 1: > changes a neutron into a proton> changes a proton into a neutron> is hit with a neutron> reconfigures its protons and neutronsoptions for 2: > a negatively charged electron-sized particle> a positively charged election-sized particle> two atoms and several neutrons> two neutrons and two protons

The excretory system,need answers for all: )

Avariable that is not being directly tested during an experiment should be