The table lists the chemical formulas or symbols of a few common substances. Which two substances are compounds? A) aluminum and iron B) iron and sodium chloride C) carbon dioxide and aluminum D) sodium chloride and carbon dioxide

What is true about electrons in the modern model of atom? (A) they are contained within the nucleus itself (B) their position can be accurately determined (C) they circle the nucleus in perfectly round orbits (D) their position can be predicted

How the atmospheric air can be used, besides our breathe?

How many moles of co2 are produced from the given amount of ch4?

When balancing the oxidation and reduction half-reactions for acidic solutions, you should: use H + and OH - equally in order to balance the equation use H + only in order to balance the equation use H + and H2O, as needed to balance the equation

If you mix different amounts of two ideal gases that are originally at different temperatures, what must be true of the final state after the temperature stabilizes? (There may be more than one correct choice.) A.

Which statement is true for a pure compound but NOT true for a pure element?

Which one is uncelluar and which is multicelluar? crab or pond organism

An atom of lithium loses an electron. What is the effect of this event? Group of answer choices The atom of a different element is formed. The atom of lithium acquires no charge. The atom of lithium becomes a positively charged ion.

Water interacts with polar substances like - OH groups but not with non-polar substances like methyl (-CH3) or ethyl groups (-CH2). Using this information, select the molecules that will easily dissolve in water based on polarity not on size.

Which of the following statements is not considered weather? The wind is blowing 20 miles per hour right now in Kansas. It is raining in Seattle. It is usually humid in Florida. It is snowing in Colorado.