Which of the following do scientists use to form a hypothesis?.

Science extends our understanding of creation. true false

The density of sodium is 968 g/cm3. Suppose you need 250 gm of sodium for an experiment. Which volume of sodium do you need? a 2,420 cm3 b 0.26 cm3 c 3.87 cm3

Which compound of an element in period 3 reacts with water to form a solution with a pH greater than 7? A. SiO2 B. SiCl4 C. NaCl D. Na2O

The formation of water from oxygen and hydrogen can be described in the following word equation: oxygen gas + hydrogen gas - liquid water In this reaction, liquid water is the Select one: •only compounds •product •waste •reactant

2CO (g) + O2 (g) = 2CO2 (g) Caculate the number of moles of CO2 produced in 6.76 moles of CO are reacted with excess oxygen.

How many different kinds of atoms occur naturally on earth? Why do you think so

Can a particle be a single atom? can a particle be a molecule?

Which is one way that in advance and biotechnology companies unintended consequence is that harm the environment? a. genetically modified plants require less water to grow b. patient using insulin pumps live longer than those without the pumps c.

A 27.3 g marble sliding to the right at 21.0 cm/s overtakes and collides with a 11.7 g marble moving in the same direction at 12.6 cm/s. After the collision, the 11.7 g marble moves to the right at 23.7 cm/s. Find the velocity of the 27.

Acids feel slick or soapy and usually have a bitter taste. True or False