1) Which of the following is true about photosynthesis?
A. It is an exothermic reaction
B.It is a endothermic reaction *****
C.It produces carbon dioxide
D. It occurs in animals
2) Atomic Theory is
A.Subject to change if new information is discovered
B.A solution to the problem of differing isotopes
C.Unchangeable *******
D.A descriptive table that lists all of the elements
3) Two nonmetals from Group 16 are likely to form a
A.triple and iconic bond
B.double and iconic
C.triple and covalent bond
D.double and covalent bond
For 3 i think it is covalent I just don't know if it is triple or double. Can someone please check these answers??
The answers are:
1.)B
2.)A
3.)D
4.)C
5.)D
6.)A
7.)C
8.)B
9.)D
10.)C
11.)C
12.)C
13.)A
14.)B
15.)C
lol guys i dont know why everyone is so worked up about 1 question on a PRACTICE TEST even if u get 0/15 IT WILL NOT AFFECT YOUR GRADE ANY PRACTICE TEST DOES NOT AFFECT YOUR TEST BUT IF U REALLY CARE I PUT D AND I GOT IT CORRECT OK JUST CHIIIIILLLLLLLLL
I just took test and it is d not c. I trusted theabove post, put c and got it wrong. It's d
No it's actually D, I took the test and it said I got it wrong and I had chosen C.
It's D guys. For all online students
NINE IS D ITS NOT C TRUST ME I TOOK THE PRACTICE AND GOT 100% PROMISE
Thank you Amaya that was just ridiculous
oh yah sorry it is c. I meant c
9 is D for kids in connexus. I tried C and got a 93.3%. I am not trying to make you get it wrong I promise. D is right, C is wrong.
Chemical Reactions Practice
Responses saved. The final score is 15/15 (100%).
Multiple Choice
1. Which of the following is true about photosynthesis? (1 point)
(0 pts) It is an exothermic reaction. (1 pt) It is an endothermic reaction. (0 pts) It produces carbon dioxide. (0 pts) It occurs in animals.
1 /1 point
2. Atomic theory is (1 point)
(1 pt) subject to change if new information is discovered. (0 pts) a solution to the problem of diering isotopes. (0 pts) unchangeable. (0 pts) a descriptive table that lists all of the elements.
1 /1 point
3. Two nonmetals from Group 16 are likely to form a (1 point)
(0 pts) triple and ionic bond. (0 pts) double and ionic bond. (0 pts) triple and covalent bond. (1 pt) double and covalent bond.
1 /1 point
Use your reference copy of the Periodic Table to answer questions 4 and 5.
4. How can you describe the location of magnesium (Mg, atomic number 12) on the periodic table? (1 point)
(0 pts) nonmetal (0 pts) metalloid (1 pt) Group 2, Period 3 (0 pts) Group 3, Period 2
1 /1 point
2/5/2019 Chemical Reactions Practice
5. How many valence electrons does magnesium (Mg) have? (1 point)
(0 pts) 12 (0 pts) six (0 pts) three (1 pt) two
1 /1 point
6. Which reaction is exothermic? (1 point)
(1 pt) cellular respiration (0 pts) photosynthesis (0 pts) baking soda + vinegar (0 pts) melting ice
1 /1 point
7. You are creating a carbon cycle poster. What could you include in the poster to demonstrate the cycling of carbon?
(1 point)
(0 pts) a rock falling (0 pts) shells fossilizing (1 pt) an eagle breathing (0 pts) the sun shining
1 /1 point
8. Which chemical equation is balanced? (1 point)
(0 pts) H20 H2 + 2O2 (1 pt) 2H20 2H2 + O2 (0 pts) 2H2O H2 + 2O2 (0 pts) H20 2H2 + 2O2
1 /1 point
9. A student mixed two clear liquids together in a beaker. A solid and a new liquid formed. The student forgot to write down the mass of one of the reactants. The rest of the data are shown in the table below.
Mass (g) liquid reactant A unknown liquid reactant B 9.0 liquid product 8.0 solid product 12.0
What is the mass of liquid reactant A?
(1 point)
(0 pts) 1.0 g (0 pts) 8.0 g (0 pts) 9.0 g (1 pt) 11.0 g (0 pts) 20.0 g
1 /1 point
10. Tony’s teacher gave him an unknown substance to identify based on its properties. Aer a few tests, Tony listed his observations in a chart.
solid at room temperature
brittle
conducts electricity
What kind of substance does Tony have?
(1 point)
(0 pts) nonmetal (0 pts) metal (1 pt) metalloid (0 pts) noble gas
1 /1 point
11. When two hydrogen atoms bond with one oxygen atom to form water, what happens to the electrons? (1 point)
(0 pts) Each hydrogen atom donates its electron to the oxygen atom (0 pts) The oxygen atom donates an electron to each hydrogen atom (1 pt) A pair of electrons is shared at each of the hydrogen-oxygen bonds (0 pts) No electrons shared or donated
1 /1 point
12. Why is frying an egg an example of a chemical change? (1 point)
(0 pts) atoms are lost during the reaction as bonds are broken (0 pts) atoms are gained during the reaction as new bonds form (1 pt) the products have dierent properties than the reactants (0 pts) the properties of the reactants are seen in the products
1 /1 point
2/5/2019 Chemical Reactions Practice
13. How did the discovery of the electron change the atomic model? (1 point)
(1 pt) It disproved the earlier idea of an indivisible atom. (0 pts) It confirmed that atoms are very tiny. (0 pts) It exposed fraudulent experiments conducted by unqualified scientists. (0 pts) It proved that atoms are easier to see than once believed.
1 /1 point
14. A student analyzed two diagrams of a nitrogen atom. Both diagrams showed seven protons in the nucleus, but the number of neutrons diered.
What are the two nitrogen atoms?
(1 point)
(0 pts) electrons (1 pt) isotopes (0 pts) covalent bonds (0 pts) ionic bonds
1 /1 point
15. What is an arrangement of all elements showing the repeating pattern of their properties? (1 point)
(0 pts) atomic model (0 pts) electron dot diagram (1 pt) periodic table (0 pts) chemical formula
1 /1 point
The final score is 15/15 (100%)