Question

Which of the following is NOT a way to speed up a chemical reaction? (Select all that apply)(1 point)
Responses

decreasing the surface area of one of the reactants
decreasing the surface area of one of the reactants

increasing the concentration of one of the reactants
increasing the concentration of one of the reactants

decreasing the temperature of one of the reactants
decreasing the temperature of one of the reactants

increasing the temperature of one of the reactants
increasing the temperature of one of the reactants
Question 2
What types of chemical reactions are the following?(1 point)
Put responses in the correct response input area to answer the question. Select a response, navigate to the desired input area and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
Al + GaP → Ga + AlP
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2 Mg + O2 → 2 MgO
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MgO + BeSe → BeO + MgSe
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CH4 + 2O2 → CO2 + 2H2O
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2 NaCl → Na + Cl2
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Question 3
One molecule of Iodine (I2) and two molecules of sodium chloride (NaCl) combine in a reaction. How many atoms are in the products?(1 point)
Responses

2
2

6
6

3
3

4
4
Question 4
Which event is an example of an exothermic reaction?(1 point)
Responses

decomposition
decomposition

melting ice
melting ice

combustion
combustion

evaporation
evaporation
Question 5
Fill in the blanks below.(1 point)
Put responses in the correct response input area to answer the question. Select a response, navigate to the desired input area and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.


In the element above the mass number is Press enter key to drop response here.Response input area and the atomic number is Press enter key to drop response here.Response input area.

Answer 1

Here are the answers:

Question 1 — NOT ways to speed up a reaction (select all that apply)
- decreasing the surface area of one of the reactants
- decreasing the temperature of one of the reactants

Question 2 — reaction types
- Al + GaP → Ga + AlP : single displacement (single replacement)
- 2 Mg + O2 → 2 MgO : synthesis (combination)
- MgO + BeSe → BeO + MgSe : double displacement (metathesis)
- CH4 + 2O2 → CO2 + 2H2O : combustion
- 2 NaCl → Na + Cl2 : decomposition

Question 3
- 6

(Products from I2 + 2 NaCl → 2 NaI + Cl2 contain 2 NaI (4 atoms) + Cl2 (2 atoms) = 6 atoms.)

Question 4
- combustion

Question 5
I can’t see the pictured element, so I don’t know the specific numbers. Generally, in an element symbol the mass number (A) is written above and the atomic number (Z) is written below. If you paste the element or its numbers, I’ll fill in the blanks.