A testable scientific question could be asked about the salt formation is; "Is the salt soluble in water?
A scientific question is a question that can be answered by experiments. In other words, a scientific question must be empirical. Its answer can only be obtained by carrying out experiments.
In the case of bonding in alkaline earth metals, the kind of bond formed is ionic. Ionic compounds are soluble in water. Hence, a testable scientific question could be asked about the salt formation is; "Is the salt soluble in water?
This can be answered by dissolving several salts of alkali earth metals in water.
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Can anyone please answer questions 3 and 4
I’ll give the brainiest!
Answer:
1.Phenolphthalein
2.Method
a.Use the pipette and pipette filler to add 25 cm 3 of alkali to a clean conical flask.
b.Add a few drops of indicator and put the conical flask on a white tile.
c.Fill the burette with acid and note the starting volume.
d.Slowly add the acid from the burette to the alkali in the conical flask, swirling to mix.
Explanation:
A compound contains 70% by mass of iron and 30% by mass of oxygen.
What is its empirical formula?
(A: 0, 16; Fe, 56]
Answer:
FeO₂
Explanation:
hAVE A nice day
Explanation:
If we assume it's FexOy
Fe : O
70 : 30. (mass ratio)
x:y = 70/56 : 30/16. (mole ratio)
1.25 : 1.875
= 1.25/1.25: 1.875/1.25
= 1 : 1.5
=2 : 3
Therefore It's Fe2O3
Chemical properties of water and oxygen for class 8
Cyclobutane consists of 4 atoms of carbon and 8 atoms of hydrogen. What is cyclobutane's empirical formula
Answer:
What is cyclobutane empirical formula : C4H8
Explanation:
what type of intermolecular force causes the dissolution of nacl in water?
Answer:
ion-dipole forces
Explanation:
positive sodium ion will be attracted to the slightly negative oxygen atoms in the water molecule, while the negative chloride ion is attracted to the slightly positive hydrogen atoms.
How do plants slow down erosion?
They slow down water as it runs downhill.
They speed up water as it runs downhill.
Their roots crack open rocks.
Their roots create new rock.
Answer:
I'm thinking the answer is gonna be it slows it down as it runs down hill
Use the periodic table to identify the number of valence electrons available for bonding for each of the following elements.
C :
H:
N:
O:
P:
CI:
Answer:
Look at the screenshot below.
Those are your answers!
Good Luck.
Explanation:
The number of valence electrons for neutral atoms is the same as the number of the atom's main group.A periodic table element's column can be used to determine its main group number.For instance, carbon, which belongs to group 4, has four valence electrons.
Use the periodic table to identify the number of valence electrons available for bonding for each of the following elements?
This rule states that each group of elements has one valence electron, two valence electrons in group 2, three valence electrons in group 13, four valence electrons in group 14, and so on. C : Six electrons make up the atom of carbon: four valence (outermost shell) electrons in the 2s and 2p orbitals, and two inner shell (core) electrons in the 1s orbital. H : As the initial element, hydrogen has an electron configuration of 1s1.Its valence shell only contains one electron.The outermost electrons or those with the highest energy level are called valence electrons. N : The periodic table's Group 15 is headed by nitrogen, which has either 3 or 5 valence electrons. O : On the periodic table, column 6 contains oxygen (symbol O).Its valence electrons number six.To obtain an octet, two bonds must be created. Ci : If chlorine removes one of its seven valence electrons, it will have eight (an octet).When chlorine gains one electron, its electron configuration resembles that of argon.If chlorine had given up all seven of its valence electrons and sodium had taken them, the octet rule would have been met.To learn more about periodic table refer
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State the term used for the light that is transmitted when complex ions absorb wavelengths of visible light. Give the answer using two words only (and be careful with spelling).
Answer:
complementary colour
Explanation:
The complementary colors are used for the light that is transmitted when complex ions absorb wavelength of visible light.
What is complementary colors?
Complementary colors are color pairs that cancel each other whenever combined and mixed, resulting in a grayscale color either white or black. They offer the most contrast for the those two hues when put adjacent to each other. Colors that are complementary are sometimes known as "opposite colors."
What is light?Light, often known as visible light, is electromagnetic radiation that falls within the region of the electromagnetic spectrum which the human eye can perceive.
Therefore, the complementary colors are used for the light that is transmitted when complex ions absorb wavelength of visible light.
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What is the frequency of light with a wavelength of 450 nm?
Answer:
The frequency of blue light that has a wavelength of 450 nm is 6.7×1014 6.7 × 10 14 Hz.
Explanation:
BRAINLIEST?
Why do metals form cations and nonmetals form anions?
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Metals have tendency to loose electrons in order to get noble gas configuration, therefore they loose electrons to form Cations (positively charged ions)
for example ~ Sodium forms Na+
And
Non - metals have tendency to gain electrons in order to attain noble gas configuration , hence they gain electron from somewhere and bears a negative charge forming Anion.
for example ~ Chlorine forms Cl-
michela and simone are camping in a ent during some hot weather
When 50 cm³ of hydrocarbon Y is burnt, it reacts with exactly 300 cm³ of oxygen to form 200 cm³ of carbon dioxide. Water is also formed in the reaction. Deduce the equation for this reaction. Explain your reasoning.
Answer:
C2H4 + 3O2---> 2CO2 + 2H2O
Explanation:
The volume of the gas is directly proportional to the no. of moles of the gas at constant temperature and pressure.
So Volume of O2 : Volume of CO2 = 300: 200
= 3:2
So we can add 3 and 2 stoichiometric coefficients to O2 and CO2 respectively.
Then we can see that out of total 3×2 atoms of O, 2×2 atoms of O have been incorporated into CO2. Therefore the remaining 2 O should be in the H2O ( during complete combustion of hydrocarbon we get CO2 and H2O as products)
So we can add 2 in front of H2O..
Then calculate the total no. of C and H atoms in the products side to find the no. of C and H atoms in the hydrocarbon.
C=2
H=4
So the hydrocarbon burnt has the formula C2H4.
To solve such this we must know the concept of combustion reaction. Therefore, The balanced chemical reaction will be
C[tex]_2[/tex]H[tex]_4[/tex]+ 3O[tex]_2[/tex][tex]\rightarrow[/tex] 2CO[tex]_2[/tex] + 2H[tex]_2[/tex]O
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Combustion reaction is a reaction in which a substance, basically hydrocarbons burns in presence of oxygen to produce carbon dioxide and water.
At constant temperature and pressure, the number of moles of the gas directly relates to the volume of the gas.
Volume of O[tex]_2[/tex]: Volume of CO[tex]_2[/tex]
= 300: 200
= 3:2
The chemical reaction will be
C[tex]_2[/tex]H[tex]_4[/tex]+ 3O[tex]_2[/tex][tex]\rightarrow[/tex] 2CO[tex]_2[/tex] + 2H[tex]_2[/tex]O
Therefore, the chemical reaction will be
C[tex]_2[/tex]H[tex]_4[/tex]+ 3O[tex]_2[/tex][tex]\rightarrow[/tex] 2CO[tex]_2[/tex] + 2H[tex]_2[/tex]O
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Hg2(NO3)2 + Na2CO3 = NaNO3 + HgCO3 balance this
Answer:
Hg(NO3)2 + Na2CO3 --> 2NaNO3 + HgCO3
What is required for two atoms to share electrons equally in a chemical bend?
Answer: Nonpolar Covalent Bond
Explanation: A Nonpolar Covalent Bond is created when atoms share their electrons equally. This usually occurs when two atoms have similar or the same electron affinity. The closer the values of their electron affinity, the stronger the attraction. This occurs in gas molecules; also known as diatomic elements.
describe how modeling is useful in studying the structure of the atom.
Answer:
Scientists use models to study atoms because atoms are extremely small and can't even be seen. If atoms can't be seen, it's easier to study and.
Explanation:
hope it helps you
why does helium fusion require higher temperatures
Answer:
Nuclear fusion of hydrogen to form helium occurs naturally in the sun and other stars. It takes place only at extremely high temperatures. That's because a great deal of energy is needed to overcome the force of repulsion between the positively charged nuclei.
Explanation:
hope it helps
what will happen to the temperature if heat is added to an object the temperature is
Answer:
The temperature will rise as a matter of fact
Explanation:
Heat is the type of energy that travels from one point to another owing to temperature difference.
about how many bacteria colines will grow in a agar plate with a swab of ginger oil
about 6 to 9 colines
if its from mouth if thats the case
when creating a calculated column in a pivottable, where does the calculated field appear?
Answer:
A calculated field will appear in the field list window, but will not take up space in the source data. In the example shown, a calculated field called "Unit Price" has been created with a formula that divides Sales by Quantity. The pivot table displays the calculated unit price for each product in the source data.
Explanation:
The PivotTable Field List contains calculated fields. Items from other fields that have been calculated display as items.
What are calculated fields?Calculated fields are defined as the fields whose values are determined by other fields' values and perhaps external sources. Data from other fields can be calculated using calculated fields. Calculating the sum of two fields is a simple example, but more complicated calculations, such averaging values from multiple tables or even gaining access to external data, are theoretically feasible.
PivotTable Field List is defined as the Areas part of the Field List allows you to organize the fields wherever you like. It features a field section where you select the fields you wish to display in your PivotTable. Using a pivot table is an interactive method for quickly summarizing enormous amounts of data.
Thus, the PivotTable Field List contains calculated fields. Items from other fields that have been calculated display as items.
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plz answer properly i need mt grades to be up
Answer: 7
Explanation:
Swimming pool structures and structural _____ [680.26(B)(1) and (B)(2)] shall not be used as a grounding electrode.
A grounding electrode is any object that directly links to the earth. They are most times used to divert electricity from the elements.
Swimming pool structures and structural reinforcing steel. 250.52(B)(3), [680.26(B)(1), and (B)(2)] shall not be used as a grounding electrode.In code 250.52(B)(3) it is clearly specified that the bonding grid and reinforcing steel that is related to a pool should not be used as grounding electrodes.
This is essential because when a metal that lies beneath a swimming pool is used as a grounding electrode, current from nearby electrical systems can be introduced into the pool.
This could cause the electrocution of anybody in the swimming pool at that time.
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help me please the subject is siecnce
Answer:
okay your question in science
(b)
Analysis of a molecule of DNA showed that cytosine accounted for 42 per cent of the
content of the nitrogenous bases. Calculate the percentage of bases in the molecule
which would be thymine. Show your working.
8%
Explanation:
In a DNA molecule the no. of Adenine bases equal to that of Thymine bases
The no. of Cytosine bases equal to that of Guamine bases.
If we take no. of Thymine bases as x and no. of Cytosine bases as y,
Adenine + Thymine + Cytosine + Guamine = 100
x + x + y+y = 100
2( x+y) = 100
x+y = 50
y=42
therefore x= 50-42 = 8%
PLEASE HELP!! 25 points!! Are these sentences true or false
1.) A machine with a mechanical advantage greater than 1 multiplies force
2.)A machine with mechanical advantage less than 1 multiplies distance
Answer:
True
Explanation:
Brainless if it helped
Electrons are shared. Is it Ionic bond, covalent bond or both?
Answer:
covalent bond
Explanation:
ionic bond is when electrons are transferred by atoms not shared
I need the answer of these questions
Answer: 33. Lattice
35. Covalent
38. Triple covalent bond
g. What is crystallization?Name any two go mixtures that can be separated by this method:name any two mixtures that can be separated by
crystallization is a process which helps to separate a pure solid from a solution in its crystal form. This is the in use to purify solid. For an example the salt we get from seawater can have many impurities in it. Hence, the process of crystallization is in use to remove these impurities.
Sugar and salt are examples of products where crystallization does not only serve as separation/purification technique, but where it is also responsible for getting crystals with the right size (and shape) for further application of the products.
- BRAINLIEST answerer
Answer:
Crystallization is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal. Some of the ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas.
Sugar and salt are two mixtures that can be seperated by crystallization
Explanation:
An atom of sodium has 11 electrons. Make a sketch of a sodium atom, showing how many electrons it has at each energy level. Infer how reactive sodium atoms are.
SOMEONE HELP ME PLEASE :(. I DONT GET IT :(
Which statement is correct about the changes in fauna’s during one of these five major events
Answer:
source Mass extinctions are episodes in which a large number of plant and animal species become extinct within a relatively short period of geologic time—from possibly a few thousand to a few million years. ... Permian Period — 252 million years ago. Devonian Period — 359 million years ago. Ordovician Period — 443 million years
BP: Nowadays, scientists are aware of five mass extinction events in the past, starting with the End-Ordovician Extinction 450 million years ago and up to the End-Cretaceous Extinction that killed off the dinosaurs 66 million years ago
In your own words- Mass extinctions area unit episodes during which an oversized variety of plant and animal species become extinct at intervals a comparatively short amount of earth science time—from probably some thousand to some million years. ... Permian period — 252 million years past. period — 359 million years past. geological period — 443 million years
BP: today, scientists area unit alert to 5 mass extinction events within the past, beginning with the End-Ordovician Extinction 450 million years past and up to the End-Cretaceous Extinction that killed off the dinosaurs sixty six million years past
Explanation:
source is where i got this information and the in your own words is it fully rewritten hope this helps and my aplogies for making this so lengthy!
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