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Questions (3)
Two compounds are placed in a beaker, and they undergo a chemical reaction. An investigator finds that the total mass after the
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Barium is an element in group 2, period 6 of the periodic table. What does this indicate about its properties?
A: It has 2
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Barium is an element in group 2, period 6 of the periodic table. What does this indicate about its properties?
2 answers
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Answers (10)
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
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
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|
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.
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
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
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.
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
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.
Which element has the same number of valence electrons as bromine (Br)? • chlorine (CI) • selenium (Se) • krypton (Kr) • potassium (K)
