Match the vocabulary terms to their definitions. 1. standard metric unit of length
mass
2. a proposed explanation for a scientific problem
meniscus
3. standard unit of volume
control
4. the curved top surface of a liquid column
hypothesis
5. a quantity in an experiment that remains unchanged or constant
meter
6. amount of matter in an object
liter

Match each object to its description: a. coma of a comet b. comet tail c. oort cloud haze surrounding a nucleus created by solar wind. hypothetical sphere around the solar system

What does x represent in the formula for the compound xcl4?

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