Answer:
1.They are all in the second group of the periodic table
2.They are an alkaline earth metal
3.They all have a shine to them
4.They are all highly reactive
5.They have a silver/white to them
6.They can all be found in the Earths crust
I'm not really sure of any others that they have in common and I thought to give extra so you could choose.
PLEASE HELP
Answer the following about this chemical equation: Na + MgF2 ---> NaF + Mg
What are the reactants?
What are the products?
Is the equation balanced?
Answer:
The reactants are the first two before the arrow and the products are the last two after the arrow, it is not balanced it would look like this if it was balanced:
2Na+MgF2–>2NaF+2Mg
Which element has 6 valence electrons? The Periodic Table O A. Carbon (C) O B. Barium (Ba) O C. Selenium (Se) O D. Lithium (Li)
Answer:
c) selenium
Explanation:
Selenium is present in group sixteen.
It has six valance electrons.
Its atomic number is 34.
Atomic mass of selenium is 78.96 amu.
Electronic configuration pf selenium:
Se₃₄ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁴
we can see there are six valance electrons are present in selenium (4s² 4p⁴).
Valance electrons are those electrons which are present in outer most electronic shell.
Other options are incorrect because,
There are 4 valance electrons in carbon.
2 valance electrons of barium.
one valance electron of lithium.
How does light travel?
in a curved line
in transverse waves
in longitudinal waves
through stored energy
i need help im a dum bleep who kept talking to guys on dc and one wont leave me alone what do i do (▰˘◡˘▰) (i already blocked him he keeps making other acc)
Answer:
Delete your discord acc, and make another one. Prob should change email tbh. If he keeps doing it you can report him, because it's like online stalking.
Explanation:
PLSSSSSSSSS HELP!!!!!!!! FIRST TO AWNSER GETS BRAINLIEST!!!!!!!!
Research four illnesses that afflict humans. Each illness should be caused by a pathogenic organism of a different type:
an illness caused by a bacterium
an illness caused by a virus
an illness caused by a fungus
an illness caused by a protist
Answer:
measles are caused by virus
strep throat is caused by bacterium
aspergillosis caused by fungus
malaria caused by protist
hope this helps!
Explanation:
100 PONTS AND BRAINLIEST
What is the maximum number of formula units of NaCl in one mole?"
Answer:
The meaning and usefulness of the mole Page 2 2 • One mole of NaCl contains 6.022 x 1023 NaCl formula units. Use the mole quantity to count formulas by weighing them.
Explanation:
The maximum number of formula units in one mole of NaCl is [tex]\rm 6.0 \times 10^{23}[/tex]formula units.
The smallest whole number ratio of ions in an ionic compound is called a formula unit. They stand for the chemical formula for an ionic compound in its purest, most basic form. Based on Avogadro's constant, it is possible to calculate the maximum amount of sodium chloride (NaCl) that may be contained in a single mole. The number of particles in one mole of a substance is represented by the Avogadro's constant, which is roughly [tex]\rm 6.0 \times 10^{23}[/tex].
One mole of sodium chloride (NaCl) contains Avogadro's number ([tex]\rm 6.0 \times 10^{23}[/tex]) of formula units because NaCl has a 1:1 ratio of sodium ions ([tex]\rm Na^+[/tex]) to chloride ions ([tex]\rm Cl^-[/tex]). This means that one mole of sodium chloride has [tex]\rm 6.0 \times 10^{23}[/tex] units of the NaCl formula.
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please help me I will give a brainleist to anyone who answers
Answer:
4
Explanation:
How many grams of H2O are needed to produce 150. g of Mg(OH)2?
Mg3N2(s) + 6H2O(l) → 3Mg(OH)2(aq) + 2NH3(g)
Answer:
About 92.67 grams of H2O are required
Explanation:
The easier way for some people is to work backwards.
Since we already have the amount of grams produced (for Mg(OH)2), we can just start from there.
In order to find the amount of grams of H2O needed we need to know the amount of moles actually used in the chemical reaction.
We can find this using the balanced chemical equation to convert from grams of Magnesium Hydroxide to moles of Magnesium Hydroxide to moles of Water and finally to grams of Water.
**58.319 g is the amu (molar mass) of Mg(OH)2
Step 1 -> 150 g Mg(OH)2 * [tex]\frac{1 mol Mg(OH)_{2} }{58.319 g Mg(OH)_{2} }[/tex] = 2.572060563 moles
We can round that to 2.572 moles of Mg(OH)2 produced.
Step 2 -> Now we can convert from moles of Mg(OH)2 to moles of H2O
We will do this using the balanced chemical equation
2.572 moles Mg(OH)2 *[tex]\frac{ 6 moles H2O}{3 moles Mg(OH)2}[/tex] = 5.144 moles of H2O required
Step 3 -> Now we will convert from moles of H2O (water) to grams
**Using the amu (molecular mass)
The molecular mass of water is about 18.015 grams
5.144 moles * [tex]\frac{18.015 grams H_{2}O }{1 mol H_{2}O}[/tex] = 92.66916 grams of H2O
So, about 92.67 grams of H2O are required
g Predict the hybridization about the central atom in the given structure. A molecule with atom Y single bonded with 3 X substituents. The Y atom has two lone pairs.
Answer:
sp3d
Explanation:
The Central atom Y is singly bonded to 3 X substituents and it has two lone pairs.
An example of compound that fits this description is BrF3.
The central atom used d orbitals for hybridization.
The 2 lone pair plus three single bond equals 5.
As the hybridization value is equal to 5 it gives rise to sp3d hybrid orbitals.
Choose any nonmetal atom from Group 5A, 6A, or 7A. What charge will it adopt when it ionizes?
Answer:
Negatively charged.
Explanation:
Hello!
In this case, since nonmetals arranged in groups 5A, 6A and 7A are able to attract the ionized form of metals (positive), we infer they are become negatively charged as they tend to gain electrons.
Some examples may be:
[tex]N^{3-}\\\\S^{2-}\\\\Te^{2-}\\\\Cl^-\\\\I^-[/tex]
Regards!
50 mL of ethanol are added to 100 mL of water. What is the percent by volume of ethanol?
Answer: the holy grail
Explanation: aaahhhhhhhh!
Aluminum bromide can be prepared by the reaction of aluminum metal with bromine gas shown by the equation: 2 Al + 3 Br2 → 2 AIBr; Now suppose that 5.6 mol of aluminum reacts with 4.4 mol of bromine. How młuch aluminum bromide will be produced?
Answer:
2.93 moles of AIBr₃
Explanation:
The balanced equation for the reaction is given below:
2Al + 3Br₂ → 2AIBr₃
From the balanced equation above,
2 moles of Al reacted with 3 moles of Br₂ to produce 2 moles of AIBr₃.
Next, we shall determine the limiting reactant. This can be obtained as follow:
From the balanced equation above,
2 moles of Al reacted with 3 moles of Br₂.
Therefore, 5.6 moles of Al will react with = (5.6 × 3)/2 = 8.4 moles of Br₂
From the calculation made above, we can see clearly that it will take a higher amount (i.e 8.4 moles) of Br₂ than what was given (i.e 4.4 moles) to completely react with 5.6 moles of Al.
Therefore, Br₂ is the limiting reactant and Al is the excess reactant.
Finally, we shall determine the amount of AIBr₃ produced from the reaction.
In this case, we shall use the limiting reactant because it will produce the maximum amount of AIBr₃ since all of it is consumed in the reaction.
The limiting reactant is Br₂ and the amount of AIBr₃ produced can be obtained as follow:
From the balanced equation above,
3 moles of Br₂ reacted to produce 2 moles of AIBr₃.
Therefore, 4.4 moles of Br₂ will react to produce = (4.4 × 2)/3 = 2.93 moles of AIBr₃.
Thus, 2.93 moles of AIBr₃ is produced from the reaction.
The amount of aluminium bromide produced is 2.93 moles
The balance chemical equation can be represented as follows;
2Al + 3 Br₂ → 2AIBr₃
let's find the limiting reagent .
Therefore,
moles of Al = 5.6 / 2 = 2.8
moles of Br = 4.4 / 3 = 1.46666666667
Bromine is the limiting reagent. The limiting reagent determines the amount of product.
Therefore,
3 moles of bromine gives 2 moles of AIBr₃
4.4 moles will give ?
cross multiply
number of moles of aluminium bromide = 4.4 × 2 / 3 = 8.8 / 3 = 2.93 moles
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8. The substance made as a result of a chemical reaction is called the
A. reactant
D. product
Which ONE????
Answer:
product
Explanation:
its the result of the reaction.
Based on the location on periodic table which best compares the properties of the metaloids arsenic and antimony
This question most likely has answer choices. The answer choices are as followed:
Arsenic has a more metallic behavior than antimony because arsenic's atoms have fewer electron shells.Arsenic has a more metallic behavior than antimony because arsenic's atoms have more electron shells.Arsenic has a more nonmetallic behavior than antimony because arsenic's atoms have more electron shells.Arsenic has a more nonmetallic behavior than antimony because arsenic's atoms have fewer electron shells.The answer is Arsenic has a more nonmetallic behavior than antimony because arsenic's atoms have fewer electron shells (4th option).
7,5,3,6,9
what three numbers add up to 12
Explanation:
3+3+6=12 is the three numbers adding up to 12
1
Cellular respiration involves a reaction between sugar and oxygen to form
A.
energy
В.
carbon dioxide.
C.
water.
D.
all of these
Determine the molecular geometry for SF4. Determine the molecular geometry for . square pyramidal trigonal bipyramidal seesaw square planar T-shape
Answer:
trigonal bipyramidal seesaw
Explanation:
The molecular geometry of SF4 is seesaw with one valence electron.
In SF4, there are four bonding pairs and one lone pair.
These atoms form a trigonal bypyramidal shape.
9. Substances have different properties because they are made up of different groups of atoms.
True or False
Answer:
That is true. They have different properties.
Answer:
I think the correct answer is True
Explanation:
Two elements that have the same properties as magnesium
gs The composition of a gas mixture is 20% O2, 20% N2 and 60% He by mass analysis. What is the molar mass of this mixture
Answer:
[tex]M_{mix}=3.92\frac{g}{mol}[/tex]
Explanation:
Hello!
In this case, since the molar mass of a gas mixture can be computed as a weighted average containing mole fractions:
[tex]M_{mix}=M_{O_2}*x_{O_2}+M_{N_2}*x_{N_2}+M_{He}*x_{He}[/tex]
Now, since we are given the by mass percent of each gas, by assuming 1 g of mixture, we therefore have 0.20 g of oxygen, 0.2 g of nitrogen and 0.6 g of helium; next we compute the moles of each gas:
[tex]n_{O_2}=0.20g*\frac{1mol}{32g}=0.00625mol\\\\ n_{N_2}=0.20g*\frac{1mol}{28.02}=0.00714mol\\\\n_{He}=0.60g*\frac{1mol}{4.00}=0.15mol[/tex]
Next, we compute the mole fractions:
[tex]x_{O_2}=\frac{0.00625}{0.00625+0.00714+0.15}=0.038\\\\ x_{O_2}=\frac{0.00714}{0.00625+0.00714+0.15}=0.044\\\\x_{He}=\frac{0.15}{0.00625+0.00714+0.15}=0.918[/tex]
Now, we compute the molar mass of the mixture as follows:
[tex]M_{mix}=32.0\frac{g}{mol}* 0.0038+28.02\frac{g}{mol}*0.0044+4.00\frac{g}{mol}*0.918\\\\M_{mix}=3.92\frac{g}{mol}[/tex]
Best regards!
According to the law of conservation of matter, we know that the total number of atoms does not change in a chemical reaction and
thus mass is conserved. Consider this model of a chemical reaction:
Reactants
Products
+ ?
The Substances
Undergoing Reaction
The Substances
Generated by the Reaction
How many oxygen molecules should be added to the reactants side to obey the law of conservation of matter?
Answer:
Compounds are represented by chemical formulas.
Explanation:
Turn on Show charge to check. These charged atoms are called ions.
B. Is each ion stable? Explain.
Answer:
Yes it is stable because they are both sharing electrons resulting in stability.
Explanation:
Some Magnesium compounds undergo thermal decomposition.
What are the products of thermal decomposition of Magnesium nitrate Mg(NO3)2 and magnesium hydroxide Mg(OH)2?
Answer:
2 Mg(NO3)2 → 2 MgO + 4 NO2 + O2.
Mg(OH)2=MgO + H2O.
hope. it helps
What volume of 18.0 M sulfuric acid must be used to prepare 15.5 L of 0.195
M H2SO4?
none of these
0.336 L
168 mL
O 92.3 mL
226 mL
Answer:
168 ml
Explanation:
M1V1= M2V2
V1=M2V2/M1
V1= 0.195×15.5/18
V1 = 0.1679 L=168ml
Answer:
Volume needed to prepare 18.0 M sulfuric acid = [tex]168mL[/tex](Option B)Explanation:
Given,
[tex]M_1 = 18M\\\\M_2 = 0.195\\\\V_1 = ?\\\\V_2 = 15.5[/tex]
Therefore,
[tex]M_1 * V_1 = M_2 * V_2\\\\ V_1 = \frac{M_2*V_2}{M_1}\\\\V_1 = \frac{0.195*15.5}{18}\\\\V_1 = 0.168L \\\\V_1 = 168mL[/tex]
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A saturated solution of calcium hydroxide contains 1.85 g of solute in 100. mL of solution. What is its molarity
Answer:
[tex]M=0.250M[/tex]
Explanation:
Hello!
In this case, since the molarity of a solution is computed by dividing the moles of solute by the volume of solution in liters, we first need to compute the moles of solute knowing that the molar mass of calcium hydroxide is 74.1 g/mol as follows:
[tex]n=1.85g*\frac{1mol}{74.1g}=0.0250mol[/tex]
Next, since the 100-mL solution is also expressed in liters by 0.100 L, we directly compute the molarity as shown below:
[tex]M=\frac{0.0250mol}{0.100L}\\\\M=0.250M[/tex]
Which is expressed in molar units that are mol/L.
Best regards!
What Makes You Unique??
Just bored so yea :))) Free 15 points :)
Answer:
you said 15 its 8 bruv
Explanation:
Answer:
the answer is 14.245. im answering like this cuz admins keep deleting my posts.
Explanation:
Predict whether each reaction proceeds predominately by substitution, elimination, or whether the two combined. Write structure formula for the major organic product(s). KOH, ethanol
Answer:
Reaction 1 - elimination
Reaction 2- substitution
Reaction 3- the two combined
Explanation:
In the first reaction, a strong base, KOH is used in the reaction. Remember that when a tertiary alkyl halide is the substrate, the use of a strong base leads to the domination of E1 mechanism over SN1 mechanism, hence the product shown in the image attached.
In reaction 2, the secondary alkyl halide must undergo an SN2 substitution since an aprotic solvent (THF) is used. This leads to inversion of configuration as shown in the product.
In reaction 3, CN^- is both a strong base and a good nucleophile hence a mixture of substitution and elimination products are formed depending on the nature of the alkyl halide.
How is a warm front formation diffrent from occlued front formation
Answer: Two cold air masses surround a warm air mass during a warm front, but a cold air mass moves against a warm air mass during an occluded front.
the path of an electron inside an element is called
Answer:
orbit
Explanation:
Though electrons can be represented simply as circling the nucleus in rings, in reality, electrons move along paths that are much more complicated. These paths are called atomic orbitals, or subshells. ... Each orbital can hold only two electrons. Electrons that occur together in an orbital are called an electron pair.
hope it helps !
How can we know which Atoms a Pure Substance is made of?
Answer: All atoms of an element have the same number of protons, though they may have different numbers of neutrons and electrons. A pure chemical compound is a chemical substance that is composed of a particular set of molecules or ions that are chemically bonded.
