Why is it not a good idea to use a stopper when combining two unknown substances in test?

In which direction is there a net force of 200 North

At would be the saturation concentration (mole/l) of oxygen (o2) in a river in winter when the air temperature is 0°c if the henry's law constant at this temperature is 2.28 * 10-3 mole/latm

A plant grows into a shrub a physical or chemical change? Explain why?

Write the electron configuration of the atom in the third row of the periodic table that has the smallest ei4.

Why do some objects such as windows and doors close in the winter but can be harder to close in the summer?

What is the name of an object containing both elements #29 and 30 with element #30 in the center surrounded by element #29?

Check every statement about the use of energy by living things that is true. Plants perform chemical reactions that require energy. Animals can use energy from the sun to produce their own food. Plants receive their energy from water in the soil.

Type of bond between na+1 ion and Cl-1 ion is ion

Does a liquid release energy or absorb energy when it changes into a gas? into a solid?

Is a sodium cation smaller or larger than a sodium atom