The cost of travelling from San Francisco to Los Angeles is $65
What is the cost of driving?
Now we know that it could be expensive to use an automobile because of the cost of gasoline. The cost of the use of gasoline depends on the distance that is travelled.
If 1 gallon is required for 24 miles
x gallons is required for 405 miles
x = 405 miles * 1 gallon/24 miles
x = 16.9 gallons
Now;
If 1 gallon costs $3.85
16.9 gallons costs 16.9 gallons * $3.85/1 gallon
= $65
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SEP construct explanations what is the difference between a molecule and a compound
The difference between a molecule and a compound is a molecule is made up of pure substance and the same type of atoms, but a compound is made up of different kinds of atoms.
What are molecules and compounds?Molecules are substances that are made up of the same type of atoms. Examples are N³, O³- ozone, etc.
Compounds are made up of different kinds of atoms. Examples of compounds are water, made up of hydrogen and oxygen. H₂O.
Thus, a compound is made up of various types of atoms, as opposed to a molecule, which is composed of a pure substance and the same type of atoms.
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Which statement best describes why a chemical change is different from a physical change?
A chemical change is used to identify characteristics of a substance, and a physical change identifies the behavior of a substance when in a reaction.
A chemical change results in a new substance being formed, whereas a physical change will result in a different state of matter.
A chemical change results in a different state of matter, and a physical change results in a new substance being formed.
A chemical change is used by scientists to create new substances, and a physical change happens naturally.
Answer:
A chemical change results in a new substance being formed whereas a physical change will result in a different state of matter
do numbers 9) and 12) asap!! thanks you!!
Explanation:
for 9 i don't know the answer but it's 0.00000901 and for 12 it's 0.0027651
Which of the following is TRUE about
scientific laws?
states that something will happen
universally observable
attempts to explain why something
happens in nature
a statement or equation that reliably
predicts patterns or events
Answer:
c
Explanation:
As we know science is all about fact so from many years scientist use to predict the future or events so answer is in my opinion c
if only 0.264 g of ca(oh)2 dissolves in enough water to give 0.178 l of aqueous solution at a given temperature, what is the ksp value for calcium hydroxide at this temperature?
The ksp value for calcium hydroxide at this temperature is 5.20 × 10⁻⁶.
What is ksp?Ksp is an equilibrium constant of a solid substance dissolved in a liquid solution.
Given that, the volume of water is 0.178 l, 0.264 g of Ca(OH)² dissolves in enough water
The solution equilibrium is
Ca(OH)² = Ca + 2OH
The molar solubility is
0.186 / 74.00 / 0.230 = 0.0109 M
The ksp value will be
Ksp = (s) (2S)²
Putting the values in the formula
(0.0109) x (2 x 0.0109)² = 5.20 × 10⁻⁶.
Thus, the ksp value for calcium hydroxide is 5.20 × 10⁻⁶.
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4. Calculate the density of helium from the fact that a balloon with capacity of 5.00
L holds 0.890 g.
The ratio of the mass in grams and volume in cubic meters gives the density. The density of 0.80 gm helium is 1.78 × 10 ⁻⁴ g/cm³.
Helium (He) is an inert gas and a chemical element belonging to Periodic Table Group 18 (noble gases). Helium, the second-lightest element (only hydrogen is lighter), is an odourless, tasteless gas that melts at a temperature of 268.9 °C (452 °F).
Helium has lower freezing and boiling points than any other known substance. The only element that cannot solidify by adequate cooling at standard atmospheric pressure is helium; in order to solidify it, pressure of 25 atmospheres at a temperature of 1 K (or 272 °C or 458 °F) must be applied. density (0 °C, 1 atm): 0.1785 grammes per litre
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A sample of hydrogen gas, H₂, has a volume of 5.86 L at a temperature of 273K and a pressure of 1.5 atm. Calculate the number of moles of H₂ present in this gas sample. Assume that gas behaves ideally.
a
5.86 mol
b
0.57 mol
c
0 mol
d
0.39 mol
The option (d) will be correct, that is the answer would be 0.39 mol.
Ideal gas equation is also known by the name of the general gas equation.
It is already mentioned in the problem,
Volume , V = 5.86 L
Temperature , T = 273 K
Pressure, P = 1.5 atm
Ideal Gas Equation : PV = nRT
n = PV / RT
= 1.5 atm * 5.86 L / 0.0821 L atm mol^-1 K^-1 * 273 K
= 8.79 / 22.41 mol
=0.39 mol
Hence the number of moles of H2 found in the gas sample is 0.39 mol.
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Q
Unit
If the rules for significant figures
are observed in the addition
example shown, how should the
total for this addition be rewritten?
A. 5,610.00
B. 5,610.340
C. 5,610.34
D. 5,610.3
35.7
432.33
+ 5,142.312
5,610.342
The correct answer to the addition of the given number will be D. 5,610.3 based on the rules for addition with significant figures.
We have to find the addition of:
35.7 + 432.33 + 5,142.312 = 5,610.342
However, according to the rule for significant figures, if the addend with the fewest decimal places is 1, the final consequent will also have one decimal place. If the lowest addend is 2, the final consequent will have two decimal places, and so on.
Because significant numbers are established in the form of digits, they are also known as significant digits. The number of significant digits can be determined by counting all of the values beginning with the first non-zero digit on the left. These numbers are dependable and required to represent the quantity of a length, volume, mass, measurement, and so on.
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(help please 20 points!!)
Explain why mass is used to measure the properties of solids, liquids, and gases.
Mass takes into account the force of gravity.
Mass is a measure of weight that stays constant.
Mass is a measure of matter that does not change.
Mass and gravity are both necessary for accurate measurements.
Mass is an extensive property of a matter which describes the number of particles in a matter. According to the law of conservation of mass "mass can neither be created nor be destroyed." Hence mass is a quantity which never changes whether a particle is in a solid, liquid or gaseous state.
a chemist measured the amount of rubidium chloride produced during an experiment. she finds that of rubidium chloride is produced. calculate the number of moles of rubidium chloride produced.
The mass of rubidium chloride that participates is 731.57 g
Complete Question
The chemical formula for rubidium chloride is RbCI. A chemist determined by measurements that moles of rubidium chloride participate in a chemical reaction are 6.05 mol. Calculate the mass of rubidium chloride that participates. Be sure your answer has the correct number of significant digits.
The mass of rubidium chloride that participates is 731.57 g
It is known that number of moles is equal to mass divided by molar mass of the substance.
No. of moles = given mass/molar mass
It is known that molar mass of RbCl is 120.921 g/mol.
Hence, calculate the mass of RbCl for 6.05 mol as follows.
No. of moles = given mass / molar mass
6.05 mol = mass/120.921g/mol
mass = 731.57 g
Therefore, we can conclude that mass of rubidium chloride that participates is 731.57 g.
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Glassware that allows a solution to be precisely and slowly added to another solution.
A glassware that allows a solution to be precisely and slowly added to another solution is a Burette.
Burette, a laboratory apparatus used in quantitative chemical analysis to measure the volume of a liquid or a gas. It consists of a graduated glass tube with a stopcock (turning plug, or spigot) at one end. The tube of the burette is filled with a fluid, such as water, oil, or mercury.
Burette is also used in Titration. It is a process of slowly adding a solution to react with another solution and determine the concentration of one of the solutions based on the reaction between them.
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3 of 103 of 10 Items
25:14
Question
Choose the words or phrases that apply to this scenario.
Several experiments in the 1800s demonstrated that the tips of plants are responsible for detecting light, which causes the stem of the plant to elongate and bend towards the light.
Which of these phrases are accurate about the experimental design and its validity? (Choose 3)
A The light levels should increase during the experiment as the plant grows.The light levels should increase during the experiment as the plant grows.
B All species of plants behave the same way.All species of plants behave the same way.
C The experiment should be repeatable by the same researcher.The experiment should be repeatable by the same researcher.
D A control plant with no light or top light would likely show no bending.A control plant with no light or top light would likely show no bending.
E The experiment should be replicated by different researchers.
The accurate phrases abut the study design and validity are:
All species of plants behave the same way A control plant with no light or top light would likely show no bending.The experiment should be replicated by different researchers.What is the role of light in the growth of plants?The role of light in the growth of plants is important as light is necessary for photosynthesis.
The growth regions of a plant are the shoots and the roots.
The shoots of plants show positive phototaxis by growing towards a unidirectional light source.
A unidirectional light source is light that comes from one direction.
The growth region of the shoot, that is the tips produces hormones which enable the tip of the plant to grow towards the light source.
Considering the given experiment , the accurate phrases abut the study design and validity are:
All species of plants behave the same way A control plant with no light or top light would likely show no bending.The experiment should be replicated by different researchers.In conclusion, the experiment to demonstrate the bending of plants shoots towards a light source should include a control and must be repeated by other researchers,
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Chemical
Part I: The Big Picture
1. When we look at the periodic table of elements, why do we not see substances such as
water listed there?
use
they
Answer:
Water is H2O which is a compound and would therefore not be on the periodic table. The periodic table only consists of elements.
calculate the average atomic mass of lead based on the given data and the atomic masses. isotope atomic mass (amu) percent abundance pb-206 205.97 14.5 pb-207 206.98 17.0 pb-208 207.98 68.5
The average atomic mass of lead given its three isotopes is 207.52.
What is average atomic mass?Average atomic mass is the weighted average of the atomic masses of the naturally occurring isotopes of an element.
According to this question, the following isotopes with their percent abundance and atomic masses of lead are given:
Pb-206 - 205.97 14.5%Pb-207 - 206.98 17.0%Pb-208 - 207.98 68.5%Pb-206 = 14.5/100 × 205.97Pb-207 = 17/100 × 206.98Pb-208 = 68.5/100 × 207.98Pb-206 = 29.865Pb-207 = 35.186Pb-208 = 142.466The average atomic mass is as follows: 29.865 + 35.186 + 142.466 = 207.52
Therefore, the average atomic mass of lead given its three isotopes is 207.52.
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HELP MEEEEEE
Which of the following is an example of a neutralization reaction?
A) 2 H2O (I) --> 2 H2 (g) + O2 (g)
B) 2 Na(s) + H2SO4 --> NaSO4 + H2(g)
C) CO2(g) + H2O --> H2CO3
D) HCI + KOH --> KCI + H2O
Select one:
a. A
b. B
c. C
d. D
Answer:
D) HCl + KOH --> KCl + H2O is the answer
polar attractions are ... polar attractions are ... (a) forces between atoms with partial charges. (b) weaker than covalent bonds. (c) important because they are numerous. (a) and (b) are true. (c) is false. (a), (b), and (c) are correct. submit
polar attractions are ... polar attractions are (a), (b), and (c) are correct.
Briefing :Between atoms with partial charges, polar attractions take place that are weaker than covalent bonds. Nevertheless, they are significant because so many of them take place in live cells.
What are polar attraction ?Between atoms with partial charges, polar attractions take place that are weaker than covalent bonds. Nevertheless, they are significant because so many of them take place in live cells. can happen inside a water molecule and can develop between H and N.
We refer to something as polar when it has two distinct ends. When a molecule has both positive and negative ends, we refer to it as being polar. We refer to someone as non-polar if they don't. Polar objects can pull or pull away from one another (opposite charges attract, alike charges repel).
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What does it mean when there is a number before a chemical letter but a small number underneath it in science
Explanation:
The little number you see to the right of the symbol for an element is called a subscript. That number indicates the number of atoms of that element present in the compound.