name all 3 elements in the following chemical formula h 2 so 4
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Name all 3 elements in the following chemical formula H 2 SO 4. How many total atoms are in the compound Ca (NO 3 ) 2 ? A. 3 B. 5 C. 7 D. 9. Give an example of a physical change. Balance the following equation: C 3 H 8 + O 2 3CO 2 + 4H 2 O. 5. Chemical reaction. - PowerPoint PPT PresentationTRANSCRIPT
Name all 3 elements in the following chemical formula
H2SO4
How many total atoms are in the compound Ca(NO3)2?
A. 3 B. 5 C. 7 D. 9
• Give an example of a physical change
Balance the following equation:
C3H8 + O2 3CO2 + 4H2O 5
Fill in the concept map with the clues to a chemical reaction.
Chemical reaction
Which of the following correctly identifies the law of conservation of mass?
a) + +
b) + +
c) +
d) + +
Lithium has properties most similar to which of these elements?
A. Potassium B. Beryllium C. Calcium D. Chromium
How many elements are in Na2CO3?
A. 2 B. 3 C. 7 D. 14
2H2 + O2 ?
In the chemical equation, the elements are rearranged to form new products. Which of the following compounds should be placed in the box?
A. HO2
B. 2H2O
C. H2OD. HCl2
Give an example of a chemical change.
A substance that is used to speed up a chemical reaction is called a(n)
a) catalyst.b) reactant.c) inhibitor.d) precipitate.
A ______________ is a chemical substance consisting of two or more different elements.
compound
The 3 in the following chemical formula is called a ____________.
2FeCl3
subscript
Which of the following is an example of a chemical property?
a) Textureb) Weight c) Flammabilityd) Hardness
According to the following chemical equation, how many reactants are needed to form water and carbon dioxide?
H2CO3 H2O + CO2
A 1B 3C 2D 4
Match the clue to the appropriate example.
1. Thermal energy given off by a fire
2. Precipitate
3. Bubbles
4. White spots caused by bleach
a. color change
b. energy change
c. solid formation
d. gas formation
Write the chemical formula for Sodium chloride.
• When carbon reacts with oxygen to form carbon dioxide, carbon dioxide is the _____________.product
• Why can’t the subscripts in chemical formulas be changed when you balance equations?
Which of the following is a diatomic element? (element always found in pairs or bonded to another element)
a) Sodiumb) Magnesiumc) Oxygend) Helium
The 3 in this chemical formula is called a ______________.
3O2
coefficient
When two colorless solutions are mixed, a yellow precipitate forms. Which of the following statements about this change is false?
a) The precipitate is a newly formed product.b) New chemical bonds were formed.c) A chemical reaction occurred.d) The new substances have the same
properties as the reactants.
The coefficient 2 in 2CO2 means that there are
a. two oxygen atoms and one carbon atom present.
b. two oxygen atoms present.
c. two carbon atoms and two oxygen atoms present.
d. two carbon dioxide molecules present.
State the law of conservation of mass.
Which of the following equations does not demonstrate the law of conservation of mass?
a) 2Na + Cl2 2NaCl
b) NaOH + HCl NaCl + H2O
c) P4 + 5O2 2P4O10
d) SnCl2 + 2FeCl3 2FeCl2 + SnCl4
Chemical reactions do not produce different substances.
True or False?