Answer:
we can reach the same conclusions by applying different experimental and observational procedures
Explanation:
The scientific method is a process that can be summarized in the following steps: 1-to raise a question, 2-to make a hypothesis, 3-to obtain data from observations and/or experiments, and finally, 4-to obtain conclusions that enable to confirm (or reject) the hypothesis. The scientific method is flexible because it is not necessary to follow 'stringent' guidelines in order to reach the same conclusions. In consequence, the predictions derived from such results can be tested again to determine the veracity of the results.
Use the periodic table to select the element that best fits each of the following descriptions.
Alkali metal:
aluminum
calcium
lithium
Answer:
Lithium
Explanation:
Using the periodic table, the selection of the element that best fits the following descriptions is lithium. The correct option is D.
What is a periodic table?A periodic table is a table that contains chemical elements in it. It is a tabular structure that displays elements according to their characteristics. It is used in chemistry and physics.
Lithium is an element that is present in the first row of the periodic table. The first row is called the alkali metals. Its atomic number is 3, and it is white and silvery.
Alkali metals are called alkali because they form alkalies reacting with water. Like lithium hydroxide. They are very strong bases. They are very reactive.
Thus, the correct option is D. lithium.
To learn more about the periodic table, refer to the link:
https://brainly.com/question/17061774
#SPJ6
3) What is the weight of the ethyl alcohol that exactly fills a
200.0 mL container? The density of ethyl alcohol is 0.789
g/mL.
Answer:
158g
Explanation:
To calculate the "weight" (mass) of ethyl alcohol, we have to use this formula:
- Density will have units of gmL when dealing with a liquid or units of gcm3 when dealing with a solid.
The mass has units of grams, g.
The volume will have units of mL or cm3
We are given the density and volume, both of which have good units so all we have to do is rearrange the equation to solve for the mass:
density×volume=massvolume×volume
Density×Volume = Mass
0.789gmL×200.0mL
Thus, ethyl alcohol weighs 158g.
What is the mass of a sample of iron that has had 300.0 j applied to it and heats up from 20.0 degrees Celsius to 40.0 degrees Celsius.. the specific heat of iron is 0.46j/gC
Answer:
The mass of a sample of iron that has had 300 J applied to it and heats up from 20 degrees Celsius to 40 degrees Celsius is 32.61 grams.
Explanation:
Calorimetry is the measurement and calculation of the measurement of heat changes exchanged by a body or a system produced in physical and chemical processes.
The sensible heat of a body is the amount of heat received or transferred by a body to produce a change in temperature but without a change in physical state.
The sensible heat in a constant pressure is calculated by:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c, and where ΔT is the temperature variation (ΔT=Tfinal - Tinitial)
In this case:
Q= 300 Jc= 0.46 [tex]\frac{J}{g*C}[/tex]m= ?Tfinal= 40 CTinitial= 20 CReplacing:
300 J= 0.46 [tex]\frac{J}{g*C}[/tex] * m* (40 - 20) C
Solving:
300 J= 0.46 [tex]\frac{J}{g*C}[/tex] * m* 20 C
[tex]m=\frac{300 J}{0.46 \frac{J}{g*C} * 20 C}[/tex]
m= 32.61 g
How many grams are in 0.02 moles of beryllium iodide, Bel2?
Answer:
5.26g
Explanation:
Please see attached picture for full solution.
When you walk up to any substance, you can categorize the substance as a solid, liquid, or gas. You could further categorize the substance as being a pure substance or a mixture, which you wouldn't know without more information. Assuming the substance is pure, what are 3 ways you could report the "amount" of substance in front of you
Answer and Explanation:
In Chemistry, the quantity or amount of a pure substance is given by:
mass (in grams)Volume (in millilitres or litres)Moles (mol)Inter-conversion of units is allowed based on defined units and constituent of the substance.
I believe this explanation would be helpful and easy to follow.
NEED HELP with 7. 8. 9. 10. 11. 12. And 14 !!
Answer:
1. 0.00040 calories
2. 8.57 calories
3. 0.196 calories
4. 68 calories
5. 243 calories
6. 83680 joules
7. 1,054,368 joules
8. 2.45 calories
9. 556 (it says calories to calories so it wouldn't change)
10. 28367.52 joules
11. 59.6 calories
12. 449.6 joules
13. 0.00234 calories
14. 23292.328 joules
15. 22877693.6 joules
Hope this helps!
Explanation:
Which is a good example of a contact force? A. protons in the nucleus of an atom B. a ball falling down after it's thrown up into the air C. a satellite orbiting Earth D. a bat hitting a ball
Answer:
B
Explanation:
Because a ball falling down is a good strong force
Correct Answer:
A ball hitting a bat
The number of neutrons in an atom affects the atomic ________of the atom. A. Activity B. number C. size D. mass
Answer:
D. Mass
Explanation:
Answer:
D
Explanation:
The number of neutrons in an atom affects the atomic mass number or atomic weight.
A centimeter and milimeter differ from each other by a factor of _____?
Answer:
10
Explanation:
a centimeter and a milimeter differ from each other by a factor of 10
Answer: 10
Explanation:
12. What is the mass, if the density is 2 and the volume is 6? *
3
O 12
O 15
is Weight Measurement a phenomenon?
Answer:
yes
Explanation:
it change everything
im pretty sure the awnser is yes
If a cubic container has a side length of 50.0cm ,what is the volume in the liter?
Answer:
0.05 Liter
Explanation:
Conversion factor: 1/1000
1) Liter = Cubic Centimeter / 1000
2) Liter = 50 / 1000
3) Liter = 0.05
Compare the properties of iron and nickel.
I need 3 comparisons
Answer:
It is important to note that iron, cobalt, and nickel which appear in period 4, of the transition metals, next to each other, share very similar physical and chemical properties and are known collectively as the iron triad
The comparison of the properties of iron includes
Chemical properties
1) Atomic number; The atomic number of iron is 26 while the atomic number of nickel is 28
2) The oxidation states of iron are 2, 3, 6 while the oxidation state of nickel are 2,3
3) The ionization energies in kJ/mol are first 759, second 1561, and third 2957 for iron and first 737, second 1753, and third 3393 for nickel
Physical properties
1) The mass of iron is 55.85 with density = 7.87 g/cm³, the mass of nickel is 58.69 with density = 8.91 g/cm³
2) The melting point of iron is 1530°C, boiling point 2862°C and that of nickel are 1455°C and 2732°C
3) The electrical conductivity of iron is 16 and that of nickel is 23
Explanation:
A model of an atom shows eight electrons in rings that represent different energy levels. How many electrons are in each energy level? A.four in the first energy level, four in the second energy level. B.zero in the first energy level, eight in the second energy level C.two in the first energy level, six in the second energy level D.eight in the first energy level, zero in the second energy level
Answer:
The correct option is;
C. Two in the first energy level, six in the second energy level
Explanation:
The electrons in an atom are arrange in orbital shells which are situated at different levels within the structure of the, depending on the energy of the electron. Electrons with the least amount of energy are found in the shell closest to the nucleus of the atom which is the first energy level
The maximum number of electrons that can be found in a given an energy level is obtained with the following formula;
The number of electron = 2 × n²
Where;
n = The number of the different energy level
Therefore;
The maximum number of electrons in the first energy where n = 1 is given as follows;
The number of electron = 2 × 1² = 2 electrons
The maximum number of electrons in the second energy level where n = 2 is given as follows;
The number of electron = 2 × 2² = 8 electrons
Given that there are only 8 electrons in the atom, we therefore have, 2 electrons in the first energy level and the remaining 8 - 2 = 6 electrons in the second energy level.
Put 6.93 x 10^5 into standard notation.
Answer:
693000
Explanation:
Multiplying anything by 10 must follow the base 10 system rules.
That means we can simply move the decimal 5 places to the right.
6.93 x 10⁵ = 693000
My answer to the question is 693000.
when an electric kettle containing cold water is switched on, the water in it starts boiling after a few minutes. what is the source of the heat energy of the boiling water?
The specific heat capacity of aluminum is 0.22 cal/g°C. How much energy needs to flow into 20.0 grams of aluminum to change its temperature by 15°C?
a) 0.017 cal
b) 0.29 cal
c) 66 cal
d) 1363 cal
*I NEED EXPLANATION, PLEASE*
Answer:
C) 66 calories
Explanation:
The Heat energy required to flow into a unit mass object to raise its temperature by 1 degree is known as specific heat capacity.
specific heat capacity of aluminum, c = 0.22 cal/g°C
mass of aluminium, m = 20.0 g
In an atom, what is the number of profons equal
to?
Answer:
The atomic number
A biological community together with its physical habitat constitutes a(n) ____________ .
Answer:
Ecosystem
Explanation:
I got the answer from the Mcgrawhill textbooks.
Round each of the following measurements to the number of significant figures
indicated.
67,029 to three significant figures
0.15 to one significant figure
52.8005 to five significant figures
3.17497 to three significant figures
Answer:
a) 67000 b) 0.20 c) 52.8010 d) 3.17000
Explanation:
your welcome :)
a) 67000 b) 0.20 c) 52.8010 d) 3.17000 are the answers respectively.
What is measurement?Distance is a physical quantity which is measured in meter. If a man travel then it is measured in meters that defines that how much he travel from one point to another point for all these type of things we use to measure distance.
Centimeter is also a physical quantity which is use to measure distance. 1 centimeter is equal to 0.01 meter and 1 centimeter is equal to 0.00001 kilometer.the kilometer is large quantity to measure distance while centimeter is smaller quantity to measure distance.
Kilometer is also a physical quantity which use to measure the distance 1 kilometer is equal to 1000 mtr and 1 kilometer is equal to 100000 centimeter.
For above conclusion, we easily states that the kilometer is large quantity to measure distance while centimeter is smaller quantity to measure distance. Centimeter is also a physical quantity which is use to measure distance. 1 centimeter is equal to 0.01 meter and 1 centimeter is equal to 0.00001 kilometer.
Therefore, a) 67000 b) 0.20 c) 52.8010 d) 3.17000 are the answers respectively.
Learn more about measurement here:
https://brainly.com/question/2107310
#SPJ2
What is the volume in cubic centimeters of a 500 mL beaker?
cm3
Answer:
500 cubic centimeters of water (cm3 - cc)
Explanation:
1 milliliter of water (ml) = 1.00 cubic centimeters of water (cm3 - cc)
The volume in cubic centimeters of a 500 mL beaker is 500 cubic centimeters of water (cm3 - cc)
What are measurement units?The two major units used to measure liquid volume are the liter and the milliliter. When measuring huge amounts of liquid, literal is utilized. Furthermore, ml is used to measure very small amounts of liquid.
Measurement units are the units I use to determine the size, number, or quantity of any object.
7 universally accepted basic units of measurement are utilized in daily life. These meters are the units of measurement used to measure distance. Second, used as a unit of measurement of time.
1 milliliter of water (ml) = 1.00 cubic centimeters of water (cm3 - cc).
Therefore, 500 cubic centimeters of water (cm3 - cc).
To learn more about measurement units, refer to the below link:
https://brainly.com/question/12629581
#SPJ2
2-11 Ozone molecules are constantly formed and destroyed in the atmosphere. A
picture (cartoon) showing how ozone
molecules are formed is shown below.
0-0
2
A family member of yours who has never studied about this tries to understand
the cartoon pictures but is unable to understand it. He knows that there are no
such living forms in atmosphere but he is not able to understand names like 0,02
and O, and also the
process explained.
How would you explain it to that family member? State in your own words.
Answer:
The diagram shows oxygen, O₂, which consists of two atoms of oxygen in the stratosphere, which are the two beings holding hands, forming a couple being broken up by the intense ultraviolet radiation of the Sun, such that the couple closest to the Sun are the ones that were broken into two O, atoms.
After being broken, the two beings (oxygen atoms), become free to move as they please, making them able to move faster than when they were still a couple. However, due to the likeness for their fellow beings, each of the single O beings rushed to meet the other two still coupled O₂ beings, whereby one O being rushing to meet one O₂ couple each, to form O₃ which is a new group consisting of three beings holding hands known as Ozone
Note, that O stands for atomic oxygen gas
O₂ stands for oxygen gas
O₃ stands for ozone gas
Explanation:
importance of hydrocarbons
Answer:
The most important use of hydrocarbons is for fuel. Gasoline, natural gas, fuel oil, diesel fuel, jet fuel, coal, kerosene, and propane are just some of the commonly used hydrocarbon fuels. Hydrocarbons are also used to make things, including plastics and synthetic fabrics such as polyester.
Write the correct term: In gaseous substances, the individual molecules are relatively (close/far apart) and are moving freely, rapidly, and randomly.
Answer:
far apart
Explanation:
The molecules of any gaseous compounds are loosely bound and the molecules are far apart from each other. They move freely and rapidly. The inter-molecular forces are lower as compared to a solid or a liquid where the molecules are comparatively closely bound in the compounds.
Because of the large gap or distance between its molecules, gaseous compounds have less density when compared to any solid or liquid.
HELP give 5 examples of how greenhouse gases effect's our earth ANd wHo wAnNa be FrIeNds.
Answer:
- sunlight heats the earth's surface
- climate change by trapping heat in the ozone layer
- increased wild fires
- food shortages due to higher temperatures
- they contribute to respitory disease due to smog and air pollution
(lol i'll be your friend)
Question 3 (1 point)
What are the best units for a scientist to measure the distance between cities?
A. miles
B.inches
C.meters
D.kilometers
Answer: A and D
Explanation: Miles and Kilometers are the best units when measuring distances between cities, this is because both units will in most cases give a reasonable representation of the distance being measured by giving an output which isn't too large or extremely small. Feets and inches are usually adopted when measuring length of objects which in most cases are small and average only a few meters. Meters are also used for measuring short and medium distances. However, representing distances between two cities in terms of inches or feets will usually give extremely large values. Hence, the need for a fairly larger unit in miles or kilometers.
you have an object with mass of 86 g and volume of 10 cm^3 (cubed). calculate density, show your work, and identify which material you have from the list.
Answer:
8.6g/cm³ (BRASS)
Explanation:
Given the following :
Mass of object = 86g
Volume of object = 10cm³
The density of an object is calculated using the formula :
Density(g/cm³) = mass(g) / volume(cm³)
Inputting our values :
Density = 86g / 10cm³
Density = 8.6g/cm³
According to the table provided, the object which corresponds to having a density of 8.6g/cm³ is BRASS
1. The density of the material is 8.6 g/cm³.
2. The material is brass
Density is simply defined as the mass per unit volume of a substance i.e
Density = mass / volume 1. Determination of the density of the materialThe density of the material can be obtained as shown below
Mass = 86 g
Volume = 10 cm³
Density =?Density = mass / volume
Density = 86 / 10
Density = 8.6 g/cm³Therefore, the density of the material is 8.6 g/cm³
2. Determination of the material.From the calculation made above, the density of the material is 8.6 g/cm³.
Comparing the density of the material (i.e 8.6 g/cm³) with those
given in the table from the question, we can conclude that the
material is brass.
Learn more: https://brainly.com/question/24659113
Find 3.2458+1.221+4.45
Answer:
8.9168 is the answer..
Which has more kinds of specialized cells, a tissue or an organ?
Answer:
An organ would have more kinds of specialized cells because it is made up of different tissues.
when salt is dissolved in water the result is a
Answer:
Water molecules pull the sodium and chloride ions apart
Explanation: