How long has there been life on Earth?

4.6 billion years

3.7 billion years

65 million years

3 million years

For keeping goods cold during shipment, what is an advantage of dry ice (frozen carbon dioxide) pver water ice?

Combustion analysis of an unknown compound provides the following dаta: 73.5 grams carbon (C), 4.20 grams hydrogen (H) and 72.3 grams chlorine (Cl). What is the percent composition of each element in this compound?

It is widely known that fossil fuels pollute the environment and cause harmful effects. Why then are fossil fuels still being widely used? 1. not enough of society knows the harmful nature of fossil fuels 2.

Which is the most ethical response if an experiment fails to confirm a hypothesis? Question 2 options: Revise the hypothesis and develop a new experiment to test it. Alter the data so that they conform to what we already know.

What's a crystallisation

Lake michigan holds 1.35 x 10^15 gallons of water

N which orbitals would the valence electrons for selenium (Se) be placed? s orbital and f orbital s orbital only s orbital and p orbital d orbital only

Anne prepares a solution of copper nitrate with a concentration of 30 g/dm³. What mass of copper nitrate did she add to 100cm³ of water, in grams?

Chemists classify an element an element as a metal based on what physical properties

What is the mass of 222 ml of ice if the density of ice is 0.92 g/ml?