Question

Which of the following choices is the most conclusive in determining whether a chemical reaction has taken place?
a change in color
a change in odor
a gas was formed
a change in the identity of the substance(s)


If different products are not created during a process, then a chemical reaction has not occurred.
TRUE
FALSE


Chemical equations provide:
the physical state of each reactant and product
the ratios of reactants and products
the chemical identity of the reactants and products
all of the above information

Answer 1

I think it is d, then false, then d

Answer 2

the first one can really be all of them but since it says most conclusive then i agree with your option. I believe the 2nd one is true but i really don't know. i believe the last one is right too. ask to be certain @Abhisar

Answer 3

The symbol, double sided arrow , is used between reactants and products in a chemical equation to indicate that a reaction could proceed in either the forward or backward direction.
TRUE
FALSE

The balanced chemical equation, Zn (s) + 2 HCl (aq) > ZnCl2 (aq) + H2 (g), can be expressed in words as:
Zirconium metal plus hydrogen chloride yields zirconium chloride solution and hydrogen gas
Xenon solid plus hydrochloric acid yields xenon chloride and hydrogen gas
Zinc metal plus hydrogen chloride yields zinc dichloride plus hydrogen gas
Zinc metal plus an aqueous solution of hydrochloric acid yields an aqueous solution of zinc chloride plus hydrogen gas


From the balanced chemical equations listed below, which equation best expresses the following word equation: The reversible reaction in which solid calcium carbonate yields solid calcium oxide plus carbon dioxide gas?
CaCO3 (s) > CaO (s) + CO2 (g)
CaCO3 (s) <> CaO (s) + CO2 (g)
CaO (s) + CO2 (g) <> CaCO3 (s)
CaClO3 <> CaClO (s) + O2 (g)


Which type of chemical reaction does this equation exemplify? c6h12o6(s)+6o2(g)>6co2(g) + 6h20(L)
synthesis
decomposition
combustion
double replacement

Which type of chemical reaction does this word equation exemplify: calcium oxide combines with silicon dioxide to form a single product: calcium silicate?
synthesis
decomposition
combustion
double replacement

Answer 4

@breram18 Which do you think it is? Why or why not? It would be easier to tutor you if you explained what about the question is giving you trouble.

Answer 5

1. true
2.D
3.B
4.A
5.A

Answer 6

@Abhisar

Answer 7

1 \(\huge\checkmark\)

Answer 8

2) \(\huge\checkmark\)

Answer 9

3) \(\huge\checkmark\)

Answer 10

4) \(\cancel{\bcancel{}}\)

Answer 11

5) \(\huge\checkmark\)

Answer 12

is number 4 combustion then?

Answer 13

Fourth one is combustion reaction since glucose is reacting with oxygen to produce carbon dioxide and water.

Answer 14

# 4 use this
1. SYNTHESIS:
a. Formation of binary compound: A + B → AB
b. Metal oxide-water reactions: MO + H2O → base
c. Nonmetal oxide-water reactions: (NM)O + H2O → acid
2. DECOMPOSITION:
a. Binary compounds: AB → A + B
b. Metallic carbonates: MCO3 → MO + CO2
c. Metallic hydrogen carbonates: MHCO3 → MO+ H2O(l) + CO2(g)
d. Metallic hydroxides: MOH → MO + H2O
e. Metallic chlorates: MClO3 → MCl + O2
f. Oxyacids decompose to nonmetal oxides and water: acid → (NM)O + H2O
3. SINGLE REPLACEMENT:
a. Metal-metal replacement: A + BC → AC + B
b. Active metal replaces H from water: M + H2O → MOH + H2
c. Active metal replaces H from acid: M + HX → MX + H2
d. Halide-Halide replacement: D + BC → BD + C
4. DOUBLE REPLACEMENT: AB + CD → AD + CB
a. Formation of a precipitate from solution
b. Acid-Base neutralization reaction
5. COMBUSTION REACTION
Hydrocarbon + oxygen → carbon dioxide + water

Answer 15

\(\huge\sf\color{green}{\text{✌ﾟ\(\ddot\smile\) ✌ﾟ}}\)

Answer 16

Initially when i see anyone posting there whole assignment with no interaction my reaction usually is

Answer 17

OMG LOL hahahahahahah

Answer 18

i am dying XD

Answer 19

that was hilarious!! I mean I usually know the answers I just want to check

Answer 20

@breram18 i know what you mean i probably beat the world record with the amout of questions i ask on this website!!

Answer 21

Good luck guys !

Answer 22

:D

Answer 23

Thank you :)

Answer 24

Which of the following choices is the most conclusive in determining whether a chemical reaction has taken place?

Answer: change in the identity of the substance(s)