Based on their chemical formulas, which of these common substances is an

element?

A. Bleach (NaClo)

B. Silver (Ag)

C. Quartz (SIO2)

D. Marble (CaCO3)

In science class, students are learning about organic compounds. An acetic acid molecule is made of 2 carbon atoms, 2 oxygen atoms and 4 hydrogen atoms. What is the ratio of carbon atoms and hydrogen atoms

What cells are chicken eggs made from

What 2 things make up pure substances?

Which statements about the periodic table's organization are true? Select all that apply. The periodic table is organized by atomic number. The periodic table is organized by reactivity. The periodic table is organized by atomic mass.

2H2+O2-->2H2O, If you have 9 moles of Hydrogen gas (H2), how many moles of water can you form? (Enter just the number: not the number and units)

Where might you find a temperature of 2 kelvin? a. north poleb. the equatorc. earth's cored. the coldest regions of outer space

A blank is a coil of wire that produces a magnetic field when it carries an electric current

What is the change in heat energy when 132g of copper at 32.2°C is raised to 45.0oC? The specific heat of copper is 0.385 J/g °C.

Polar covalent bonds are formed when the electrons in the bond are not shared equally between the two nuclei. which one of these molecules contains polar bonds?

The flame from my candle gives off black smoke heat and light what type of changes do these indicate