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What is the most reasonable metric measure for the width of a thumb tack?
40 cm
40 mm
10 mm
5 kg
8 AnswersHomework Help1 year agoCan points be units of measurement?
For instance number of points students got on a test.
2 AnswersMathematics2 years agoTrue or false Theories uniting biology?
1. All living organisms are composed of one or more cells.
2. Different cell types develop in a multicellular organism because each cell has its own unique set of genetic instructions.
3. Underlying similarities in biochemistry and genetics support the idea that all life evolved from a single source.
4. Molecules in different organisms that perform the same function are likely to have a similar structure.
5. The diversity of life-forms is sorted into four kingdoms.
6. Information stored in photosynthetic pigments is used to direct the synthesis of cellular components.
7. Offspring inherit their genes from their parents.
8. The unity of living things arises through evolutionary change. g
2 AnswersBiology2 years agoAtomic structure true or false?
1. A neutral carbon atom (atomic number = 6) has six electrons located in three different energy levels.
2. An atom consists of a central nucleus surrounded by electrons that are in constant motion.
3. Almost all of the mass of an atom is concentrated in its orbitals.
4. The orbital of an electron is the volume of space where the electron is most likely to be found.
5. Almost all of the volume of an atom is empty space.
6. The reactivity or chemical behavior of an atom depends primarily on the number of neutrons it has.
7. Because electrons are attracted to the positively charged nucleus, they have potential energy of position.
8. The first two energy levels of an atom contain two electron orbitals each.
9. Each electron orbital can hold up to two electrons.
10. Atoms with unfilled electron orbitals tend to be less reactive.
1 AnswerChemistry2 years agoAnswer whether chemistry questions are true or false?
1. All living organisms are composed of one or more cells.
2. Different cell types develop in a multicellular organism because each cell has its own unique set of genetic instructions.
3. Underlying similarities in biochemistry and genetics support the idea that all life evolved from a single source.
4. Molecules in different organisms that perform the same function are likely to have a similar structure.
5. The diversity of life-forms is sorted into four kingdoms.
6. Information stored in photosynthetic pigments is used to direct the synthesis of cellular components.
7. Offspring inherit their genes from their parents.
8. The unity of living things arises through evolutionary change.
1 AnswerBiology2 years agocalculate how much energy in kilojoules is released or absorbed during the reaction of 1 mole of C2H4 Show the numbers added and subtracted?
Is the reaction is endothermic or exothermic.
Bond Energies: H-C = 414 kJ/mole; H-H = 436 kJ/mole; C=C = 614 kJ/mol
1 AnswerChemistry2 years agoWrite out the reaction for the formation of ozone in the stratosphere.?
3 AnswersChemistry2 years agoThe specific heat of gold is 0.129 J/g^oC} If a 32.76 g sample of gold at 35 oC is heated to 84 oC,?
how many joules of energy were absorbed?
1 AnswerChemistry2 years agoCatalytic converters on automobiles are designed to reduce the emission of?
carbon dioxide.
carbon monoxide.
sulfur oxides.
nitrogen oxides.
3 AnswersChemistry2 years agoA 0.50-L sample of drinking water is found to contain 8.0 μg of toluene.?
Does this exceed the standard? Maximum contaminant level for toluene is 1.0 mg/L.
3 AnswersChemistry2 years agoA 0.50-L sample of drinking water is found to contain 8.0 μg of toluene.?
What is the concentration of toluene in the sample?
1 AnswerChemistry2 years agoIn the removal of pollution, the most expensive fraction of pollution to remove is the?
last fraction.
middle fractions.
The cost is constant across all fractions removed.
first fraction.
4 AnswersChemistry2 years agoAcid rain is precipitation with a pH?
above 11.5.
below 5.6.
below 3.6.
above 8.2.
5 AnswersChemistry2 years agoSelect the processes that are impacted by greenhouse gases. Select all that apply.?
Depletion of fossil fuels
Melting or formation of glaciers and polar ice sheets
Increasing levels of pollutants in rainwater
Variations in global temperature
Increasing sea levels
1 AnswerChemistry2 years agoDescribe two ways in which the level of nitrogen oxide emissions from an automobile can be reduced.?
Check all that apply.
Run the engine on a richer mixture (with more fuel and less air).
Lower the operating temperature of vehicles.
Run the engine on a richer mixture (with less fuel and more air).
Higher the operating temperature of vehicles.
1 AnswerChemistry2 years agoWhat two acids are mainly responsible for acid rain?
H2SO3
HNO3
HCl
H2SO4
H2CO3
HNO2
3 AnswersChemistry2 years ago