Answer:
when you multpily or divide powers of 10 you just add or subratact respectivley
Explanation:
(5.93 x 10 ^ 3) (2.3 x 10^ -2) = (5.93 * 2.3 ) x 10 ^ 3 +(-2)
= 13.639 x 10 ^ 3-2
= 13 . 639 x 10
1.3639 x 10^2
WORTH 60 POINTS DONT PLAGIARIZE OR WILL REPORT. thanks :) You and your family are going on a trip in Europe. Calculate the speed in the following picture. Show your work and include units. Include 4-5 sentences explaining.
Answer:80
Explanation:
It would be 80 kilometers an hour. All you have to do is divide the total distance traveled which in this case is 240 kilometers, by the number of hours driven which is 3 hours.
Suppose you are asked to determine whether a nugget is made of gold on the basis of its density. You weigh the nugget and find that it has a mass of 163 grams (g). Then you carefully add it to a graduated cylinder that contains 50.0 milliliters (mL) of water and observe that the water level in the cylinder rises to 58.5 mL. What is the density of the nugget in grams per cubic centimeter?
Answer:
Explanation:
density is mass over volume
Mass = 163 grams
Volume = 58.5 - 50.0 = 8.5
density = 163 / 8.5
density = 19.176
To 3 figures that 19.2 grams / mL
Answer:
density is mass over volume
Mass = 163 grams
Volume = 58.5 - 50.0 = 8.5
density = 163 / 8.5
density = 19.176
To 3 figures that 19.2 grams / mL
Explanation:
An element is defined in chemistry as
Answer:
In chemistry, an element is a pure substance which cannot be broken down by chemical means, consisting of atoms which have identical numbers of protons in their atomic nuclei. The number of protons in the nucleus is the defining property of an element,
Given that the density of iron is 11.35 grams per centimeter
cubed, what would be the volume of a 1.1 gram piece of iron?
Answer:
Volume = 0.097 cm³Explanation:
Density of a substance can be found by using the formula
[tex]Density(\rho) = \frac{mass}{volume} [/tex]From the question
Density = 11.35 g/cm³
mass of iron = 1.1 g
To find the volume substitute the values into the above formula and solve for the volume
That's
Making volume the subject we have
[tex]volume = \frac{mass}{Density} [/tex]So we have
[tex]volume = \frac{1.1}{11.35} [/tex]= 0.096916
We have the final answer as
Volume = 0.097 cm³Hope this helps you
You have a stock solution that is 226mg/mL and you need 10mL of a working solution that is 15mg/mL. What is the volume of stock solution will you need to dilute to have 10mL of working solution at the above concentration. State your answer to two decimals.
Answer: 0.67 ml
Explanation:
According to the dilution law,
[tex]C_1V_1=C_2V_2[/tex]
where,
[tex]C_1[/tex] = concentration of stock solution = 226 mg/ml
[tex]V_1[/tex] = volume of stock solution = ?
[tex]C_2[/tex] = concentration of working solution= 15 mg/ml
[tex]V_2[/tex] = volume of working solution= 10 ml
Putting in the values we get:
[tex]226mg/ml\times V_1ml=15mg/ml\times 10ml[/tex]
[tex]V_1=0.67ml[/tex]
Thus volume of stock solution needed to dilute to have 10mL of working solution at the above concentration is 0.67 ml
Which of the following is an example of chemical energy changing into radiant energy?
A. A fireplace glowing when lighted B. A plant using sunlight to make food C. A child on a swing slowing down as she swings upwards D. A coil of a toaster glowing when the toaster is switched on
Answer:
D. A coil of a toaster glowing when the toaster is switched on
Explanation:
How do scientists calculate the energy and frequency of photons?
Carlos has 1.2 m a long piece of wood? how long is this in millimeters
Answer:
1200 millimeters
Explanation:
if there are 1000 millimeters in a meter then you have to multiply 1.2 meters by 1000 to get the number of millimeters. 1.2*1000=1200mm
Explain how heat as a reactant or product in a chemical reaction makes the change endothermic or exothermic?
✅Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.
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Answer:
Heat as a reactant makes the change endothermic, while heat as a product makes the change exothermic.
Explanation:
In an endothermic reaction, heat is a reactant, making the endothermic reaction cooler than its surroundings. This can be compared to how an ice cube melting requires heat as a reactant.
In an exothermic reaction, heat is a product, making the exothermic reaction hotter than its surroundings. This is compared to how a fire releases heat into the air as a product.
One half of a balanced chemical equation is shown. 3Mg(OH)2 + 2H3PO4
Answer:
3Mg(OH)2 + 2H3PO4 = Mg3(PO4)2 + 2H3O
Explanation:
Question:
Which lists the numbers of each atom the other half of the equation would contain?
Equation:
3Mg(OH)2 + 2H3PO4
Options:
3 Mg, 2 P, 14 O, 12 H Mg, 2 P, 14 O, 6 H 3 Mg, 8 P, 7 O, 6 H 6 Mg, 6 P, 2 O, 12 HAnswer:
A) 3 Mg, 2 P, 14 O, 12 H
Explanation:
I just did the test on edge 2020 and got the answer right. Also, my dog said hi.
Express 0.044 km in meters.
Answer:
44
Explanation:
You multiply the length value by 1000
Answer:
0.044 km × 1000 = 44 meters
How many cubic centimeters of an ore containing only 0.22% gold (by mass) must be processed to obtain $100.00 worth of gold? The density of the ore is 8.0 g/cm3 and the price of gold is $818 per troy ounce. (14.6 troy oz = 1.0 ordinary pound, called an avoirdupois pound; 1 lb = 454 g)
Answer:
The cubic centimetres of the ore containing 0.22% gold (by mass) that must be processed to obtain the $100.00 worth of gold is approximately 216 cm³
Explanation:
The percentage by mass of gold in the ore = 0.22%
The density of the ore = 8.0 g/cm³
The price of the gold = $818 per troy ounce
14.6 troy oz = 1.0 pound
1 lb = 454 g
Given that one troy ounce = $818
$100 worth of gold = 1/818 ×100 troy ounce = 100/818 troy ounce
1 troy oz = 1.0/14.6 lb
100/818 troy oz = 100/818 × 1.0/14.6 lb = 250/29857 lb ≈ 0.0084 lb
1 lb = 454 g
250/29857 lb = 454 × 250/29857 g ≈ 3.8015 g
$100 = 3.8015 g worth of gold
The mass, M, of the ore containing 3.8015 g of gold is given as follows;
0.22% of M = 3.8015 g
0.22/100 × M = 3.8015 g
M = 3.8015 g × 100/0.22 = 1727.933 g
The volume, V, of the ore containing 3.8015 g of gold is given as follows;
Density of ore = Mass of ore/(Volume of ore)
Volume of ore = Mass of ore /(Density of ore)
The density of the ore = 8.0 g/cm³
Volume of ore = 1727.933 g /(8.0 g/cm³) = 215.99 cm³ ≈ 216 cm³
Therefore, the cubic centimetres of the ore containing 0.22% gold (by mass) that must be processed to obtain the $100.00 worth of gold ≈ 216 cm³.
13.26 g has
significant figures
1.
0
1
2
3
4.
Answer:
13.26 g has 4 significant figures
Which of the following is correct?
a. One molecule of methane reacts with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water.
b. One gram of methane reacts with two grams of oxygen to produce one gram of carbon dioxide and two grams of water.
c. One mole of methane reacts with two moles of oxygen to produce one mole of carbon dioxide and 2 moles of water.
d. a and c are correct.
Answer:
The correct option is d. a and c are correct.
Explanation:
First, we will write a balanced equation for the reaction between methane (CH₄) and oxygen (O₂).
The reaction between methane (CH₄) and oxygen (O₂) gives carbon dioxide (CO₂) and water (H₂O). The balanced equation for the reaction is shown below
CH₄ + 2O₂ → CO₂ + 2H₂O
The number beside each molecule on the reactant side indicates the number of the individual molecules required for complete reaction and also the number beside each molecule on the product side indicates the number of the individual molecules produces in the reaction.
This means,
One molecule of methane will react with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water. Hence, option a is correct.
From,
Number of molecules = Number of moles × Avogadro's number
Since Avogadro's number is constant, hence, the equation also means,
One mole of methane will react with two moles of oxygen to produce one mole of carbon dioxide and two moles of water. Hence, option c is correct.
For the mass relationship,
Mass = Number of moles × Molar mass
Molar mass of methane = 12 + 1(4) = 16 g/mol;
∴1g of methane = 0.0625 mole
Molar mass of oxygen = 16 g/mol;
∴2g of oxygen = 0.125 mole
Molar mass of carbon dioxide = 12 + 16(2) = 44 g/mol;
∴1g of CO₂ = 0.02272 mole
Molar mass of water = 1(2) + 16 = 18 g/mol;
∴2g of water = 0.11111 mole
From the equation 0.0625 mole of methane reacts with 0.125 mole of oxygen to produce 0.0625 mole of carbon dioxide and 0.125 moles of water.
Hence, option b is not correct.
which best describes an element? - a pure substance - a type of a mixture - a pure compound - an impure substance
Answer:
A pure substance
Explanation:
An element is a pure substance.
It is only made up of atoms of the same type.
A chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 6.9 mL. If the metal weighs 4.9 g, what is the density of the metal?
Answer:
The density of the metal is 0.561 g/mL
Explanation:
The computation of the density of the metal is shown below;
As we know that
The Density of the metal is
[tex]= \frac{mass}{volume}[/tex]
where,
Mass = 4.9g
Change in volume = 6.9 mL
Now place these values to the above formula
So, the density of the metal is
[tex]= \frac{4.9g}{6.9mL}[/tex]
= 0.561 g/mL
Hence, the density of the metal is 0.561 g/mL
We simply applied the above formula so that the correct density could arrive
Dimensional analysis, Plz hell I don’t understand and plz explain
Explanation:
30 lb is 480 ounces
34 mi/second is 54.718 kilometre/ second
455 lb/ gal is 54521.024 grams / litre
50 cl is 500 millilitres
55nm is 5.5 × 10^-6 centimetre
Hydrocarbons that contoins least double bond are
Answer:
Chemistry has taught that ;
Unsaturated hydrocarbon molecules that contain one or more double bonds are called alkenes.
Alkynes are unsaturated hydrocarbons due to the fact that some of the carbons are connected to fewer than four neighbouring atoms.
Note : Alkenes contain at least one double bond, while alkynes contain at least one triple bond.
Explanation:
I would really appreciate help on this! Thank you.
Classify the following as a chemical or
physical property:
Chlorofluorocarbons destroy ozone.
Answer: Chemical
Explanation:
The reaction of destroying is a chemical change in the ozone molecules.
Tessa knows that the sea grape tree can grow well in areas of high st and poor soil. She has seen sea grape growing along the beach strands and coastal hammocks of south Florida. She sets up an experiment to see which amount of salt is best for sea grape. She chooses two plants. She gives pure water to the first plant and a strong salt water solution could Tessa do to improve her experiment? the econd. Then, she measures growth.
How many centimeters are in 5.46 meters
Answer: 546 meters
Explanation: multiply the length value by 100
Sand is made of tiny pieces of rock that have been worn down by wind and water. Explain why the formation of sand is a physical change.
Answer:
This change is only a physical change because the wind and water do not change the chemical make-up of the rock, the weathering is only changing the size nothing else.
Explanation:
Physical changes happen when objects or substances experience a change that does not alter their chemical constitution.
Because some of the physical characteristics of the rocks change, but their personalities do not. The shreds of rock are ordered as their sizes and shapes change, but their identities and total section endure the same.
SOLVE Use the density formula to solve the following problems. A sample of a substance has a volume of 60.5 mL and a density of 1.20 g/mL. What is the mass of the sample?
The mass of the sample is 72.6 g. when a sample has a volume of 60.5 mL and a density of 1.20 g/mL.
What is the density?Density may be defined as the physical property of any object. It may be characterized as the measurement of quantity or mass per unit of volume in a particular substance.
According to the question, the volume of a sample = 60.5 mL.
The density of a sample = 1.20 g/mL.
Now, the formula for density is as follows:
Density = Mass/Volume.
But we have to calculate the mass of the sample, so the modified formula is = Mass = Density x Volume.
∴ Mass = 1.20 g/mL x 60.5 mL = 72.6 g.
Therefore, the mass of the sample is 72.6 g. when a sample has a volume of 60.5 mL and a density of 1.20 g/mL.
To learn more about Density, refer to the link:
https://brainly.com/question/1354972
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What is the weight of 2.5 ml of a solution that has a density of 1 g/mL?
Answer:
Density=mass / volume.
1= mass × 2.5.
mass = 2.5×1.
mass=2.5g
please solve this problem
Answer:
option D is correct
Explanation:
the molecule of nitrogen and ethyne have triple bond in them
N2= N≡N
ethyne =CH≡CH
Are Elements on the Period Table of Elements?
Yes or No?
Answer:
Yes they are I guess so
:)
Answer:
Yes it is
Hope it helps
Which of the following describes the difference between Carbon−12 and Carbon−14? A. Carbon-12 has 12 electrons, 12 protons, and 12 neutrons; Carbon−14 has 14 electrons, 14 protons, and 14 neutrons. Both are radioactive isotopes. B. Carbon-12 has 6 electrons, 6 protons, and 6 neutrons; Carbon−14 has 6 electrons, 6 protons, and 8 neutrons. Both are radioactive isotopes. C. Carbon−12 has 6 electrons, 6 protons, and 6 neutrons; Carbon−14 has 6 electrons, 6 protons, and 8 neutrons. Only Carbon−14 is a radioactive isotope. D. Carbon−12 has 6 electrons, 6 protons, and 6 neutrons; Carbon−14 has 6 electrons, 6 protons, and 8 neutrons. They are not radioactive isotopes.
Answer:
B
Explanation:
Why can't an atom lose or gain a proton?
I need help will give you fives star
Answer:
2
Explanation:
The maximum amount of electrons in an atom that can share those quantum numbers because of the spin quantum numbers (ms) +1/2 and -1/2.
Is it possible for an object to lose weight but at the same time not lose any
mass?
Answer: NO
Explanation:
When you lose weight, you lose mass. These to are directly linked together
Consider this: weight=mass×gravity
If weight decreases, mass also decreases basing on the expression. Gravity is constant (meaning it will not change because mass or weight changes) so it will not impact the result.
Hope this helps!! :)
Please let me know if you have any question
It is possible for an object to loose weight and not loose mass.
The weight of a body is obtained as W= mg where;
W = weight of the body
m = mass of the body
g = acceleration due to gravity
Since the magnitude of the weight of a body depends on its mass, and acceleration due to gravity it is possible for an object to loose weight and not loose mass.
The value of acceleration due to gravity is not the same at all points in the universe. Hence, if an object is moved to a location where the value of acceleration due to gravity is lower, the object will loose weight but not mass.
The mass of an object is constant and does not change irrespective of the location where it is measured.
Learn more: https://brainly.com/question/13860566