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in litmus , alkali solution turns to _________ color.
blue
A negative acceleration means that your object is a. at rest b. constant speed c. speeding up d. slowing down
slowing down
What type of reaction best describes the equation below? Zn + H2S -- ZnS + H2 a. decomposition b. double replacement c. single replacement d. decomposition
single replacement
The product of acid + base yields salt and _____________. a. water b. hydrogen c. oxygen d. carbon dioxide
water
What is the number before a chemical formula called? a. coefficient b. subscript c. superscript d. co-numbers
coefficient
In humans, a diploid cell has ___________ chromosomes. a. 23 b. 46 c. 22 d. 1 set
46
The transfer of pollen grain from the anther to the stigma is called ____________. a. fertilization b. pollination c. germination d. mutation
pollination
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products? a. the product is doubled b. the mass changes depending on the reaction c. the product is half the mass of the reactants d
mass is the same
When producing a soluble salt in a reaction between an acid and an alkali, how can you prepare dry solid crystals from the solution? a. condensation b. filtration c. evaporation/ crystallization d. neutralization
evaporation / crystallization
The law of conservation of mass states that a. matter can be made b. matter can be destroyed c. matter can be destroyed and can be made d. matter can neither be made or destroyed
matter can neither be destroyed nor created
The vessel for water a. phloem b. xylem c. a and b d. none of the above
xylem
In starch test, the iodine in the leaves turns _________ which indicates the presence of starch. a. green b. blue black c. red
blue black
. Chlorophyll is: a. The substance that makes plants green. b. Found inside the chloroplast cells. c. Used to absorb energy from the sun. d. all of the above
all of the above
The reaction XY ⟶ X + Y is an example of _____. a. synthesis b. combustion c. decomposition d. replacement
decomposition
What element does every combustion (fire) reaction have to have? a. carbon b. hydrogen c. nitrogen d. oxygen
oxygen
Where in the plant cell does photosynthesis happen? a. vacuole b. vascular bundles c. chloroplast d. chlorophyll
chloroplast
Which of the following pairs is mismatched? a. Carpel - Produces pollen grains b. Stigma - Receives pollen grains c. Anther - Produces microspores d. Ovary - Develops into fruit
carpel - produces pollen grains
The process by which one or more substances change to produce one or more different substances a. chemical process b. chemistry c. chemical reaction d. chemical reactant
chemical reaction
Sex cells are generally called _______. a. zygote b. diploid c. haploid d. gametes
gametes
The stomata are openings in the leaf which allow for gas exchange. Which cells found either side of the opening control the stomata? a. guard cells b. mesophyll palisade c. spongy palisade d. all of the above
guard cells
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