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Barium is an element in group 2, period 6 of the periodic table. What does this indicate about its properties?

Barium is an element in group 2, period 6 of the periodic table. What does this indicate about its properties? A: It has 2 valence electrons and is a non-reactive gas. B: It has 2 valence electrons and is highly reactive. C: It has 6 valence electrons and...

Two compounds are placed in a beaker, and they undergo a chemical reaction. An investigator finds that the total mass after the compounds react is less than the sum of the masses before they react. Which statement explains this observation? • Some of the...

Which element has the same number of valence electrons as bromine (Br)? • chlorine (CI) • selenium (Se) • krypton (Kr) • potassium (K)

Why are sodium (Na) and potassium (K) in the same group on the periodic table? • They are both colorless. • They have similar atomic weights. • They have similar reactivity. • They are both hard and brittle.

A student cuts some fabric into two pieces. Is this change physical or chemical? • It is a chemical change because the size changes. • It is a physical change because the process is reversible. • It is a chemical change because there is no phase change. •...

How are chemical changes different from physical changes? • They include shifts in the phase of matter. • They are reversible. • They involve heat. • They form new substances.

Which phenomenon occurs because of adhesion? • Two water droplets that touch join to form one larger drop. • Water droplets stick to a window after a rainstorm. • Water forms into droplets if you drip water onto a table. • Soap bubbles form into the shape...

How does a balanced chemical equation demonstrate the Law of Conservation of Mass? • it shows that only physical changes follow the Law of Conservation of Mass • it shows that the properties of the elements stay the same after the reaction it shows that n...

Which procedure could be used to demonstrate that matter is conserved during a physical change? • Find the mass of a cup of water. Boil the water. Find the mass of the water that remains. • Find the mass of an apple. Cut the apple and remove the core. Fin...

One molecule of bromine (Br) and two molecules of potassium chloride (KCI) combine in a reaction. How many atoms are in the products? • six • two • three • four|

One molecule of bromine (Br) and two molecules of potassium chloride (KCI) combine in a reaction. How many atoms are in the products? the options are: • six • two • three • four

Use the unbalanced chemical equation to answer the question. 2NaHCO3 → Na2CO3 + CO2 Which of the following can be added to the products to balance the equation? (1 point) СН2ОН Н20 02 Н2