Answer:
Atomic radius is directly proportional to Metallic reactivity in group 2.
Explanation:
Atomic radius is directly proportional to Metallic reactivity in group 2.
As we move down the group in group 2 which is called as the alkaline earth metals, the atomic number increases due to which the subshell increases. And the outermost shell's electron are less tightly held to the nucleus of the atom. Since the electrons are loosely held that means they can easily participate in reactions and that what makes it reactive down the 2nd group. Therefore alkaline earth metals with higher atomic number are more chemically reactive.
If Maria winks exactly 5 times every minute while she is awake and she sleeps exactly 8 hours a day, how many times does Maria wink in a day?
1. Which type of heat transfer does a fan give off? Explain why you think that way.
Answer:
Convection is a heat transfer mechanism where heat moves from one place to another through fluid currents. Forced convection is simply using this mechanism in a useful way to heat or cool a home efficiently, such as using a fan.
Explanation:
Moritz is watching his little brother play in a mud puddle. Moritz notices that when his brother stirs it with a stick, after a few moments the dirt settles back to the bottom of the puddle. His brother is creating a . Anjali knows that whole milk has more fat than skim milk. However, the solid fat doesn’t seem to separate from the liquid milk even after it has been in the fridge for a few days. This is evidence that milk is a .
Answer:
1. suspencion
2.colloid
Explanation:
Answer:
Moritz is watching his little brother play in a mud puddle. Moritz notices that when his brother stirs it with a stick, after a few moments the dirt settles back to the bottom of the puddle. His brother is creating a SUSPENSION.
Anjali knows that whole milk has more fat than skim milk. However, the solid fat doesn’t seem to separate from the liquid milk even after it has been in the fridge for a few days. This is evidence that milk is a COLLOID.
Is this a scientific model? Use complete sentences to explain why or why not. (5 points)
help quick
Answer:
yes
Explanation:
Write the symbol of each neutral element based
on its Noble Gas Shorthand configuration:
Answer:
1. Co
2. C
3. Ba
Explanation:
GIVING BRAINLEST TO WHOEVER HAS THE RIGHT ANSWER. Plz and Tysm
True or False: Temperature
and pressure increases as the depth increases inside the earth
1. True
2. False
Answer:
true
Explanation:
as you get closer to the center it gets hotter
6th grade science i mark as brainliest
Answer:
A: 60 hours
Explanation:
What element does the following orbital notation represent?
1s
2s
2p
3s
Зр
4s
3d
What are produced when a base is mixed with water?
hydrogen ions
hydroxide ions
oxygen atoms
oxygen ions
Answer:
The answer is hydrogen ions
SiO2 + 3C -> SiC +2CO
If 100 grams of C are to react completely, how many grams of SiO2 are needed?
Answer:
=242.47 g of HF
Explanation:
Which type of data do scientist used to predict tornadoes wind flow in temperature cloud cover and wind flow moisture levels and temperature cloud cover and moisture levels
Answer:
Wind flow and temperature
Explanation:
There is a answer on brainly to this question already
Answer:
I do K12 its wind flow and temp.
Hope this helps,
0Drink0Milk0
Is N2 + H2 > NH3 balanced?
Answer:
yes
Explanation:
This can be fixed by multiplying the product contacting nitrogen by 2. o The new chemical equation is N2 +H2 →2 NH3 Reactants Products Nitrogen 2 2 Hydrogen 2 6 Since NH3 is multiplied by a coefficient of 2 there are now 2 nitrogens and 6 hydrogens. The 6 hydrogens come from the 2 multiplied by the subscript of 3.
A 0.853-g of 90.0% lithium chlorate mixture decomposes with heat to give 313 ml of oxygen gas collected over water at 20 c and 762 mmHg .what is the percentage of LiCLO3 in the mixture?
Answer:
[tex]\%LiClO_3=90.4\%[/tex]
Explanation:
Hello!
In this case, since the undergoing chemical reaction is:
[tex]LiClO_4\rightarrow LiCl+\frac{3}{2} O_2[/tex]
It is widely known that when a gas given off from a reaction is collected over water, we can compute its pressure by minusing the total pressure 762 mmHg and the vapor pressure of water at the experiment's temperature (20 °C) in this case 17.5 mmHg as shown below:
[tex]p_{O_2}=762mmHg-17.5mmHg=744.5mmHg*\frac{1atm}{760mmHg}=0.980atm[/tex]
Next, by using the ideal gas equation we compute the yielded moles of oxygen considering the collected 313 mL (0.313 L):
[tex]n_{O_2}=\frac{PV}{RT}=\frac{0.980atm*0.313L}{0.082\frac{atm*L}{mol*K}*293.15K}\\\\ n_{O_2}=0.0128molO_2[/tex]
Now, via the 3/2:1 mole ratio between oxygen and lithium chlorate (molar mass = 90.39 g/mol), we compute the original mass of decomposed lithium chlorate as follows:
[tex]m_{LiClO_3}=0.0128molO_2*\frac{1molLiClO_3}{3/2molO_2}*\frac{90.39gLiClO_3}{1molLiClO_3} \\\\m_{LiClO_3}=0.771gLiClO_3[/tex]
Now, the percentage is computed as shown below:
[tex]\%LiClO_3=\frac{0.771g}{0.853g} *100\%\\\\\%LiClO_3=90.4\%[/tex]
Best regards!
What are some foods that require dry ice
Which type of chemical bond is formed by the attraction between positive ions and surrounding mobile electrons?
A) ionic
B) nonpolar covalent
C) metallic
D) polar covalent
Answer:
C metallic bond is the answer
In the formation of silicon carbide represented by the chemical equation sio2+3c-->sic+2co 8.0 moles of each reactant are available for the reactant.What is the limiting factor?
Answer:
7.3
Explanation:
what is the ka for a 0.25 m solution of a monoprotic weak acid with a ph of 4.65
Answer:
ka = 2x10⁻⁹
Explanation:
Using the pH we can calculate the molar concentration of H⁺, [H⁺]
pH = -log[H⁺] = 4.65[tex]10^{-4.65}[/tex] = [H⁺] = 2.24 x 10⁻⁵ MThen we use the expression of Ka for the equilibrium of a weak monoprotic acid:
HA ↔ H⁺ + A⁻
Where:
ka = [tex]\frac{[H^+][A^-]}{[HA]}[/tex]
ka = [tex]\frac{(2.24*10^{-5})(2.24*10^{-5})}{0.25-2.24*10^{-5}}[/tex] = 2x10⁻⁹
What is the pH if 0.0256 g of Potassium Hydroxide are dissolved in enough water to make .212 liters of solution? (Hint: you are
solving for poH first and then finding pH)
pH= 11.332
Further explanationKOH⇒K⁺+OH⁻
KOH(MW=56,1056 g/mol)
mol KOH :
[tex]\tt \dfrac{0.0256}{56.1056}=4.56\times 10^{-4}[/tex]
molarity KOH :
[tex]\tt \dfrac{4.56\times 10^{-4}}{0.212}=2.15\times 10^{-3}[/tex]
[OH⁻]=[KOH]=2.15 x 10⁻³
pOH=-log[OH⁻]
[tex]\tt pOH=-log~2.15\times 10^{-3}\\\\pOH=3-log~2.15\\\\pOH=2.668[/tex]
pH+pOH=14
[tex]\tt pH=14-2.668=\boxed{\bold{11.332}}[/tex]
What is the fancy name for the cell membrane?
Answer:
plasma membrane
Explanation:
Following Rutherford, Niels Bohr developed an improved model of the atom in which the electrons moved around the nucleus in quantized energy shells. Which of the following phenomena could Bohr's model explain but Rutherford's model could not?
Group of answer choices:
spectral emission lines from hydrogen atoms
wave-particle duality of electrons
protons accounting for roughly half of an atom's mass
alpha particles passing through gold foil undeterred
Answer:
spectral emission lines from hydrogen atoms
Explanation:
How many dots go around Rubidium in a Lewis Dot Structure?
Answer:
I believe it's one dot in an electron dot diagram (or rubidium)
Explanation:
I hope this helps
. A compound contains nitrogen and oxygen in the mole ratio of 1:1. Which of the
following could be the molecular mass of this compound?
14
16
40
30
Answer:
30
Explanation:
Given that;
the compound contains nitrogen and oxygen in the ratio 1:1;
We can say the compound is NO
Now,
Molecular mass of NO;
Molar mass of N = 14g/mol
Molar mass of O = 16g/mol
Molecular mass of NO = 14 + 16 = 30g/mol
Which mistake did Maria make on her diagram
Answer:
Explanation:here’s the diagramm somebody help
She boiled the ingredients as the recipe instructed. What kind of change is this?
A. Physical change
B. Chemical change
Answer:
a
Explanation:
Which element has 47 protons?
Answer:
silver
Explanation:
**Please Help** -
why is the equation 3HCl + Al = AlCl3 + H2 unbalanced?
Answer:
because its supose to be 3HCL+3AL___3ALCL+H³
Which of the following is the CORRECT FORMULA for an element from GROUP 2
bonded to an element from GROUP 16 (6A)?
A. MgS2
B. Ca2S6
C. BeO
D. Sr2S2
How many moles are present in 2.3 x 1023 molecules of NH3?
Answer:
I don't know if this is helpful. I'm sorry if it is not.
Please answer ...
P
L
E
A
A
E
Answer:
C
Explanation:
Option C: They are all matter, they have mass, take up space and are made of atoms
Mark me brainiestwhat has a positive charge
Answer:
A proton carries a positive charge and an electron carries a negative charge
Explanation:
is this what u want???
