Answer:
d. Equinox
Explanation:
A certain day in spring and autumn where the amount of daytime hours and nighttime hours are the same is called equinox.
Equinox occurs twice in a year on March 20 and September 23rd.
During an equinox, the south and north hemisphere of the earth are receiving equal amount of sunlight. The opposite of equinox is solstice in which the duration of light is unequal. The equator is the only great circle that is a line of latitude.*CHEMISTRY*
During ionic bonding, there must be a chemical interaction between....
O metallic elements, only
O nonmetallic elements, only
O one metallic and one nonmetallic element, only
O metalloids ,only
Why have people mostly studied the problem of plastic at the ocean
surface?
*
Answer:
because its polluting the waters and they want to see if its harming the small sea life living in those locations
Explanation:
im 90% sure abt this srry if its wrong
In roses, the color red is dominant (R), and the color white is recessive (r). Based on the Punnett Square, what is the probability ratio that the roses will be white?
Answer:
0.25
Explanation:
From the given information:
The dominant trait R = red color; &
The recessive trait r = white
If a heterozygous traits Rr crosses with a dominant trait RR;
The Punnet square will be as follows:
R r
R RR Rr
R RR Rr
Thus all the flowers are red and there is 50% dominant red rose flowers (RR) and 50% heterozygous red rose flowers (Rr).
Let assume that two heterozygous traits (Rr) cross together; Then the punnet square is:
R r
R RR Rr
r Rr rr
From the above punet square, we have:
0.25 dominant red rose flowers
0.5 heterozygous red rose flowers;
0.25 recessive white rose flowers.
What is the balanced chemical equation for the reaction of aqueous sodium hydroxide and sulfuric acid?
Select one:
a.NaOH(aq) + H2SO4(aq) = H2O(l) + NaSO4(aq)
b.NaOH(aq) + H2SO4(aq) = H2O(l) + Na(SO4)2(aq)
c.2 NaOH(aq) + H2SO4(aq) = 2 H2O(l) + Na2SO4(aq)
d.NaOH(aq) + H2SO4(aq) = H2O(l) + Na2SO4(aq)
Answer:
H2SO4 + 2(NaOH) -----> Na2SO4 + 2(H2O).
Explanation:
The Bohr Model of an atom represents...
O dots in the valence shell, only
O dots in shell 1, only
O dots in specific shells based on electron configuration
O dots and symbols, only
explain
how partical of matter attract each other ??
plz help me
have a great day
Answer:
Explanation:
Particles of matter attract each other. There's a force that acts on the particulate matter that keeps it together.
I hope it help you?
Add me to a brainiest and i will add you too :)
Can somebody help me. Will mark brainliest.
Answer:
Average atomic mass of X= 64.25 amu
Explanation:
Abundance of X-64 = 80%
Abundance of X-65 = 15%
Abundance of X-66 = 5%
Average atomic mass = ?
Solution:
Average atomic mass of X = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100
Average atomic mass of X= (80×64)+(15×65) +(5×66) /100
Average atomic mass of X = 5120 + 975 + 330 / 100
Average atomic mass of X = 6425/ 100
Average atomic mass of X= 64.25 amu.
determine the hydronium ion concentration of an aqueous solution that has a pH of 4.0
Answer:
Imagewww.chem.purdue.edu › Equilibrium
Calculating the Hydroxide Ion Concentration from pOH
To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter ...
Calculating pH
Calculating hydronium ion ...
Calculating pOH
Calculating hydroxide ion ...
Calculating pKa
People also ask
How do you find hydronium ion concentration when given pH?
The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation employed to find the pH. [H3O+] = 10-pH or [H3O+] = antilog (- pH) Example: What is the hydronium ion concentration in a solution that has a pH of 8.34? On a calculator, calculate 10-8.34, or "inverse" log ( - 8.34).
What is the "major drawback" to using word equations?
a) Word equations can't be translated to other
languages.
b) Words are not specific enough to identify
chemicals.
C) Word equations are not quantitative.
Answer:
C
Explanation:
they can be put in other languages
they are literally the name of the chemical
they don't show quantity
The "major drawback" to using word equations is that they are not quantitative. Option C is correct.
Chemical reactions are written in word equations to give a clear and concise understanding of the reaction taking place. However, word equations are not quantitative. A equation is a way of representing a chemical reaction using words. It identifies the reactants and products and their physical states as well as the condition under which the reaction is taking place.
For example, the word equation for the reaction between hydrogen gas and oxygen gas to produce water is:
Hydrogen gas + oxygen gas → water
Quantitative equations use chemical formulas, numbers and symbols to represent the reactants and products in a chemical reaction. They provide a quantitative understanding of the reaction in terms of the number of atoms and molecules involved.
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plzzzzzz helpppp!!!!!!
How much distance did you travel if you jogged at a speed of 7 miles per hour and you jogged for 1.5 hours?
Answer:
10.5 miles
Explanation:
7x1.5=10.5
Answer:
4.6666667
Explanation:
A polar solute will dissolve in _____.
a polar solvent
a nonpolar solvent
gasoline
sugar water
Answer:
Polar solvents because polar substances are likely to dissolve in polar solvents.
Explanation:
(pls mark me brainliest)
Answer:
a polar solvent
Which group of compounds has a –OH functional group?
aldehydes
esters
carboxyl acids
alcohols
balence the following equation :
_____ MgO + _____ Li2SO4 -----------> ______ MgSO4 + ______ Li2O
Answer:
it's already Balanced
MgO + Li2SO4 ---------✓ MgSO4 + Li2O
What is the formula for the compound copper (II) sulfate pentahydrateA. C2S3•6H2O
C
2
S
3
•
6
H
2
O
B. CuSO4•6H2O
C
u
S
O
4
•
6
H
2
O
C. C2S3•5H2O
C
2
S
3
•
5
H
2
O
D. CuSO4•5H2O
Answer:
D
copper (II) sulfate pentahydrate
==>
[tex]CuSO _{4}.5H _{2}O[/tex]
2. CHECK ALL THAT APPLY: Select the question(s) that will involve molar mass.
(1 Point)
How many atoms of lithium would be equal to 3.7 moles of lithium?
A substance consisting of 3.7 grams of beryllium fluoride would be equal to how many moles of beryllium
fluoride?
How many grams of sodium are equal to 1.5 moles of sodium?
If you had 5.6 moles of carbon dioxide, you would have how many liters of carbon dioxide?
Answer:
A substance consisting of 3.7 grams of beryllium fluoride would be equal to how many moles of beryllium fluoride?
How many grams of sodium are equal to 1.5 moles of sodium?
Explanation:
The molar mass is related to number of moles and mass of an element or compound.
Using the expression:
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
For any problem, where the number of moles is known, we can find the mass.
A substance consisting of 3.7 grams of beryllium fluoride would be equal to how many moles of beryllium fluoride?
Here we know the mass, we simply use the molar mass to find the number of moles.
How many grams of sodium are equal to 1.5 moles of sodium?
Here number of moles is given, we use the molar mass to find the mass of the sodium given
please help I need the awnser quick will give brain to first to awnser
1.Which is the lowest level of organization for the system in a human
body? *
brain cell
nerve tissue
Answer:
brain cell
Explanation:
hope this helps :)
Which type of offspring are most likely the result of sexual reproduction?
O A. diverse offspring with half of the genes from each parent
o
B. identical offspring with half the genes from each parent
O
C. identical offspring with the same genes as the parent
OD. diverse offspring with the same genes as the parent
Answer:
C
Explanation:
C.OD diverse offspring with the same genes as the parent
what type of energy warms earths surface?
A. Solar energy
B. Gravitational energy
C. Nuclear energy
D. Thermal energy
a. solar energy
the earth is warmed by the sun, which is solar (or infrared).
The contents of two beakers are described in the table.
Contents of Beakers
Beaker
Contents
Final Substance Formed
X
sugar, water sugar not visible in water
Y
sand, water sand settled at the bottom of the beaker
If a gas is cooled from 323.0 K to 273.15 K and volume is kept constant, what final
pressure would result if the original pressure was 0.986 atm?
How many molecules are there in 218.4 grams of C0CI2?
Answer:
10.24 ×10²³ molecules
Explanation:
Given data:
Mass of COCl₂ = 218.4 g
Number of molecules = ?
Solution:
Number of moles of COCl₂:
Number of moles = mass/molar mass
Number of moles = 218.4 g/ 129.84 g/mol
Number of moles = 1.7 mol
1 mole contain 6.022×10²³ molecules.
1.7 mol × 6.022×10²³ molecules / 1mol
10.24 ×10²³ molecules
A nail contains 0.10 moles of iron. How many grams of iron are in the nail?
Answer:
10.8
Explanation:
That's my guess, I hope you figure everything out though.
A nail contains 0.10 moles of iron. Therefore, 5.58g is the mass in gram of iron in the nail. Iron makes up 5% of the Earth's crust.
What is iron?Iron makes up 5% of the Earth's crust and is the second most abundant metal after aluminum, and the fourth most abundant element after oxygen, silicon, and aluminum. Iron, the main component of Earth's core, serves as the most prevalent element on the planet and is relatively abundant in the Sun and in other stars.
The free metal is uncommon in the crust, appearing as domestic iron in basalts in Greenland as well as carbonaceous deposits in the United States, as well as kamacite, a low-nickel meteoric iron. Taenite, a natural alloy of nickel-iron, is found in terrestrial deposits including meteorites.
mass = moles ×molar mass
= 0.10 ×55.8
= 5.58g
Therefore, 5.58g is the mass in gram of iron in the nail.
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Predict what would happen if you prepared food on a countertop that had just
been cleaned with chemicals but was not completely rinsed off.
Answer:
there would be chemicals on the food.
Explanation: Hope this helps :)
Which has the larger atomic mass carbon or neon?
Answer:
Neon
Explanation:
Carbon has an atomic mass of 12
Neon has an atomic mass of 20
Which set of characteristics accurately describes the physical properties of electrons in atoms
A negatively charged particle with very little mass
B negatively charged with a mess similar to a proton
C positively charged particle with very little mass
D neutral particle With a mass similar to a proton
Answer: Option (A) is the correct answer.
Explanation:
When there occurs no change in the chemical composition of a substance then it is known as physical property.
For example, mass, volume, density are all physical properties.
Since, the mass of an electron is negligible and an electron holds a negative charge.
Therefore, negatively charged particle with very little mass accurately describes the physical properties of electrons in atoms.
Although Ionic Compounds are described by small whole # ratios like MgCl2 combining in a 1:2 ratio, in reality the ions typically combine in much larger ratios like a _______ : _______ ratio
Fresh water is distributed blank in both time and space.
Answer:
unevenly
Explanation:
Fresh water is distributed unevenly in both time and space.
What is the concentration of a solution containing:
a 4 moles in 2 dm of solution?
b 0.3 moles in 200 cm3 of solution?
a. 2 M
b. 1.5 M
Further explanationGiven
a 4 moles in 2 dm of solution?
b 0.3 moles in 200 cm3 of solution
Required
The concentration of a solution
Solution
Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution
Can be formulated :
[tex]\large \boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]
a.
moles(n) = 4
volume(V)=2 L solution
M = 4 : 2 = 2
b.
moles(n)=0.3
volume(V)=200 cm3 = 0.2 L
M = 0.3 : 0.2 = 1.5
An aqueous solution is 40.0% by mass silver nitrate, AgNO3, and has a density of 1.47 g/mL.
The molarity of silver nitrate in the solution is
M.
Answer:
Molarity = 3.46 M
Explanation:
Given data:
Percentage of silver nitrate = 40.0%
Density of AgNO₃ = 1.47 g/mL
Molarity of solution = ?
Solution:
40% means out of 100g we have 40 g of AgNO₃ and 60g solvent.
Number of moles of silver nitrate = mass /molar mass
Number of moles = 40 g/ 170 g/mol
Number of moles = 0.235 mol
Volume of solution:
Total mass of solution = 100 g
density = 1.47 g/mL which means there are 1.47 gram into 1 mL.
100 g/1 × 1mL/ 1.47 g × 1 L / 1000 mL
0.068 L
Molarity:
Molarity = number of moles / volume in L
Molarity = 0.235 mol / 0.068 L
Molarity = 3.46 M