Methane reacts with oxygen to produce carbon dioxide and water. what are the products?
question 1 options:
methane and water
oxygen and carbon dioxide
methane and oxygen
carbon dioxide and water
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question 2 (1 point) question 2 unsaved
which one is a true statement about endothermic reactions?
question 2 options:
energy is absorbed making it feel colder.
the reaction container always feels hot.
the reactants have less heat energy than the products.
more heat is given off than is put into the reaction.
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question 3 (1 point) question 3 unsaved
what is the term for a solid that forms when two liquids are mixed together?
question 3 options:
a reactant
an energy source
a precipitate
a solute
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question 4 (1 point) question 4 unsaved
how do ionic bonds differ from covalent bonds?
question 4 options:
electrons are shared in a covalent bond.
electrons are transferred in a covalent bond.
protons are shared in a covalent bond.
protons are transferred in a covalent bond.
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question 5 (1 point) question 5 unsaved
how many hydrogen atoms are in water, h2o?
question 5 options:
1
2
3
0
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question 6 (1 point) question 6 unsaved
how many chlorine (cl) atoms would be in 4 molecules of salt (4 nacl)?
question 6 options:
1
2
3
4
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question 7 (1 point) question 7 unsaved
an atom that has the same amount of atoms of each element on both sides of the reaction obeys what law?
question 7 options:
law of conservation of energy
law of conservation of mass
law of conservation of temperature
law of conservation of atoms
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question 8 (1 point) question 8 unsaved
if you have 5 grams of product after a chemical reaction, how many grams of reactants did you have at the start of the reaction?
question 8 options:
2
3
4
5
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question 9 (1 point) question 9 unsaved
in the reaction, al2o3 + 6 hcl → blank space + 2alcl3, what coefficient should be placed in front of h2o to balance the reaction?
question 9 options:
1
2
3
6
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question 10 (1 point) question 10 unsaved
which one of the following is an element?
question 10 options:
salt water.
sugar
oxygen
chocolate chip cookies
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question 11 (1 point) question 11 unsaved
which of the following is an example of a homogeneous mixture?
question 11 options:
sand at the beach
granite
fruit salad
apple juice
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question 12 (1 point) question 12 unsaved
what makes a solution a homogeneous mixture?
question 12 options:
there is only one component.
it is uniform in composition.
the mixture has multiple colors.
the mixture contains solids and liquids.
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question 13 (1 point) question 13 unsaved
in a solution of salt and water, which component is the solute?
question 13 options:
salt
water
beaker
oxygen
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question 14 (1 point) question 14 unsaved
which of these can be classified as a pure substance?
question 14 options:
solution
compound
heterogeneous mixture
homogeneous mixture
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question 15 (1 point) question 15 unsaved
if a solution is saturated, which of these is true?
question 15 options:
more solute can be dissolved.
the concentration cannot be increased.
the solution has a low concentration of solute.
more solvent can be dissolved.
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question 16 (1 point) question 16 unsaved
the following characteristics describe which of these terms? the substance is not uniform in appearance and each part of the mixture contains a combination of different ingredients in different ratios.
question 16 options:
heterogeneous mixtures
homogeneous mixtures
pure substance
solution
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question 17 (1 point) question 17 unsaved
which one of the following is not a compound?
question 17 options:
salt
sugar
water
chocolate chip cookies
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question 18 (1 point) question 18 unsaved
which one of the following is not a homogeneous mixture?
question 18 options:
vegetable soup
carbonated beverages
saline solution
brewed tea
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question 19 (1 point) question 19 unsaved
what is the difference between a compound and a mixture?
question 19 options:
a mixture is a pure substance, but a compound is not.
a compound is a pure substance, but a mixture is not.
mixtures are chemically combined, but compounds are not.
you cannot separate mixtures, but you can separate compounds.
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question 20 (1 point) question 20 unsaved
which of these is a unique property of acids?
question 20 options:
feels slippery
tastes sour
has a ph level of 10 or higher
contains a carbon