CHEMISTRY HIGH SCHOOL

4 × 10-5 cm in scientific notation

Answers

Answer 1
Answer:

Answer:

400000

Explanation:

First, figure out what 10^5 is. It is 100000. Then multiply it by 4 and there is your answer!

Also if it is 4x10^-5, it is 0.00004!

Oh yeah! If you want it to be in scientific notation, it is: 4x10^5

Since that I didn't quite understand what you are trying to question, it is either 4x10^5 or 4x10^-5!

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Which formulas represent one ionic compound and one molecular compound?

Answers


ionic compounds lose or gain electrons to become stable.
ionic compounds are bonds between metals and nonmetals.

molecular or covalent compounds share one or more electrons to become stable.
molecular or covalent compounds are bonds between nonmetals.

Final answer:

An example of an ionic compound is sodium chloride (NaCl). An example of a molecular compound is carbon dioxide (CO2).

Explanation:

One example of an ionic compound is sodium chloride (NaCl), where sodium (Na) is a metal that forms a positively charged ion and chlorine (Cl) is a nonmetal that forms a negatively charged ion. The formula for a molecular compound is represented by carbon dioxide (CO2), where carbon (C) and oxygen (O) atoms share electrons to form covalent bonds.

Learn more about Ionic and molecular compounds here:

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A potassium atom (atomic number 19) and a bromine atom (atomic number 35) can form a chemical bond through a transfer of one electron. The potassium ion that forms has 18 electrons. What best describes the bromide ion that forms?

Answers

Answer:

C. It is a negative ion that has one more valence electron than a neutral bromine atom.

Explanation:

took test

It may have twice as much electrons a the potassium ion.

Boron found in nature has an atomic weight of 10.811 and is made up of the isotopes 10B (mass 10.013 amu) and 11B (mass 11.0093 amu). What percentage of naturally occurring boron is made up of 10B and 11B respectively? a. 30:70
b. 25:75
c. 20:80
d. 15:85

Answers

C 20:80 because the equation would be (10×.2)+(11×.8)

The reaction AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq) is a_________reaction. please help

Answers

Answer:

it's a precipitation reaction.

Explanation:

the solid produced is insoluble with water–making it a precipitate.

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Answers

Also could be an alkali metal (such as Na) and a halogen (such as Cl)
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In the same science fair,Tina ask the question "does caffeine increase the heart rate of an earthworm?" In test 1,she measures the heart rate by looking at the earthworm under a microscopes, the heart rate if 50 beats per minute. In test 2,she places a few drops of caffeine on the earthworms skin and measures the rate again.in this test the heart rate is 68beats per minuteWhat is the independent variable in this experiment
What is the dependent variable in this experiment
Tina's experiment should have included a hypothisis .in a complete sentence,suggest a hypothesis for Tina's experiment

Answers

The independent variable is the one that does not change depending on other variables - so here it would be the presence or the absence of caffeine - this is dependent on Tina's actions, but not on other variables in the experiment. The dependent variable is the heart rate - it is assumed to depend on the presence or absence of caffeine. A hypothesis could be that "Caffeine causes an increase of heart rate in earthworms" - and this hypothesis is what the experiment is testing.
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