Biology, 12.10.2020 20:01 gearchanger52p02zf8
1.A chemical change is different than a physical change because in a chemical change
a. Chemicals are used
b. Molecules do not physically touch
c. A new substance is formed and in a physical change no new substance is formed
d. The change can be seen but in a physical change it cannot
2.Which of the following is a physical change?
a. Burning
b. Freezing
c. Rusting
d. Oxidation
3.Jamal combined baking soda and vinegar, but he is having trouble determining if what he observed is a chemical reaction or a physical change. Choose two answers that demonstrate evidence of a chemical change?
a. Change in color
b. Absorption of heat
c. No change on properties
d. Formation of new substances
4. In a chemical reaction, if the reactants are heated, the reaction usually happens
a. Faster
b. Slower
c. At the same rate
d. In a smaller volume
Explain why your answer is correct:
Answers: 1
Biology, 22.06.2019 01:30, jfrjtwrg
In a classic experiment using pea shape, mendel conducted two separate genetic crosses. in the first cross the parent plants were “true breeding” for pea shape; one had round peas ( r )and the other had wrinkled (r). the first cross produced a filial 1 generation of all round peas. in the second cross, mendel bred plants from the filial 1 generation. this cross produced different results. out of approximately 1000 plants, about 75% were round and 25% were wrinkled.
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Biology, 22.06.2019 04:00, shaelynwolf326
Regarding most of the narrator’s story, which word best describes the tone?
Answers: 1
1.A chemical change is different than a physical change because in a chemical change
a. Chemicals a...
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