Answers
Related Questions
What is an important effect of gravity?
A. It causes radioactive particles to split off from the nucleus.
B. It is responsible for charge attraction.
C. It keeps the nucleus of the atom together.
D. It maintains the distances between planets.
SUBMIT
Answers
Answer:
d. It maintains the distances between planets.
Explanation:
Help me please!
What is the solubility of KNO3 in 100g of water at 60°C?
A.
28 grams/100g of H2O
B.
45 grams/100g of H2O
C.
108 grams/100g of H2O
D.
38 grams/100g of H2O
Answers
Answer:
C. 108 grams/100g of H2ORequired number is the vertical coordinate of the intersection point of a line at 60°C with the graph of the KNO₃.
Zinc reacts with nitric acid to produce hydrogen gas and zinc nitrate, Zn(NO3)2. 10.00 grams of zinc react with 7.84 grams of nitric acid. How many grams of excess reactant remain?
Answers
Answer:
Zn is the excess reactant and remain 5.94g
Explanation:
The reaction of Zn with HNO3 is:
Zn + 2 HNO3 → H2 + Zn(NO3)2
1 mole of Zn reacts with 2 moles of HNO3
To solve this question we must convert the mass of each reactant to moles in order to find limiting reactant. Thus, we can kknow the moles of excess reactant that will not react:
Moles Zn -Molar mass: 65.38g/mol-:
10.00g * (1mol / 65.38g) = 0.1530 moles Zn
Moles HNO3 -Molar mass: 63.01g/mol-:
7.84g * (1mol / 63.01g) = 0.124 moles HNO3
For a complete reaction of 0.124 moles of HNO3 are required:
0.124 moles HNO3 * (1mol Zn / 2 mol HNO3) = 0.0622 moles Zn. As there are 0.1530 moles, Zn is the excess reactant and will remain:
0.1530 moles - 0.0622 moles = 0.0908 moles Zn
The mass is:
0.0908 moles Zn * (65.38g / mol) =
5.94gThe subject is science I need you’re help plsssss
Answers
Answer:
sweat is the water that comes out of your body when you workout
Pls help with science
Answers
A ________________ uses chemical formulas to model what happens in a chemical reaction.
Pick 1 of the following
molecule compound
chemical equation
chemical reaction
new chemical
Answers
Answer:
Explanation:
Chemical equation
The points labeled on the chart below represent the approximate size of Earth, the Milky Way, the Moon, and the Sun. The approximate size of the Solar System is also shown.Space Size Which point on the chart best represents the approximate size of the Sun? Question 5 options: W X Y Z
Answers
Answer:
The answer is Y
Explanation:
:p
Mosquitoes breed in areas where there is often standing, still, svampy, water. Mosquitoes can cause malaria and other harmful diseases to humans and animals. Without causing damage to an existing ecosystem, what could you do to help control the current mosquitoes and their larvae? (what would eat them ?)
Answers
Answer:
Many natural scents that are appealing to humans actually repel mosquitoes, including lavender, peppermint, basil, and eucalyptus. Many of these scents can be worn as an essential oil on your skin to help keep these pesky pests from biting you.
What do these observations tell you about the rate and direction of heat flow through each specific type of plastic?
Answers
Answer:
Heat is something you can't control
Explanation:
Plastic is something you could control like moving it around
Help me in this question please (No links!!.)
Answers
Answer:
Density = mass/volume so the answer is 6g/ml
Explanation:
How many moles are in 7.00 x 10^24 atoms of N. Watch your significant figures
11.6 moles N
12.0 moles N
11 atoms N
11.6 atoms N
Answers
Answer:
11 atoms N
Explanation:
On a hot day, a student places a glass of cold lemonade on a table outdoors. After a few minutes, water droplets have formed on the outside of the glass.
Is energy absorbed or released by the cold lemonade? Explain your answer.
Compare average kinetic energy for the air molecules and lemonade molecules when the student first places the lemonade outdoors. Explain your answer.
Explain how and why the water droplets form on the outside of the glass.
Answers
Answer:
ye but sdfajkd tryng to play me
Explanation:
Answer:
Vapor is released out of the lemonade because when you place it in a hot it will increase.
Explanation:
Balance the equation NaHCO3(s)....
Please help!!
Question #1
Answers
Answer:
NaHCO3 → H2O + CO2 + Na2CO3
Explanation:
What are cells made of?
Answers
Answer: All cells are made from the same major classes of organic molecules: nucleic acids, proteins, carbohydrates, and lipids.
Explanation: please mark as brainliest
Tyler is running down the street after his brother at a speed of 1.2 m/s and contains 10.8 J of kinetic energy. Calculate Tyler’s mass
Answers
Answer:
I do not know
Explanation:
I am vert sorry but I do not know the answer.
BRAINLIESTT
The pH of a solution is 8.43. What is it {H3O+}concentration?
A. 3.7 x 10-3
B. 2.7 x 10-6
C. 1.0 x 10-14
D. 1.0 x 10-8.43
Answers
Answer:
D. 1.0 x 10-8.43
Explanation:
The pH is an unit of concentration in chemistry used to determine the acidity -or basicity- of a particular solution. Is used in quality control to determine the security of a product for consumers.
The equation is:
pH = -log [H₃O⁺]
As pH = 8.43:
8.43 = -log [H₃O⁺]
10^-8.43 = [H₃O⁺]
1.0x10 -8.43 = [H₃O⁺]
Right option is:
D. 1.0 x 10-8.43can I write "+-" as the charge for a neutron in an atom or would it be considered wrong?
Answers
Answer:
yesssssssssssssss
Explanation:
can someone do the rest of this for me i missed school the day we did it
Answers
Answer:
This is the answer
Explanation:
hi everyone want me to answer your modules? from grade 7-8
i kinda want to do just a small bussiness so i can help with my mom for my tuition if you do message me in messenger name Kaczara Kisha Eimerh Rosales all you have to do is pay me maybe about atleast 20-30 pesos i really appriciate it if you do
Answers
Answer:
addd me :)
Explanation:
hehehehehe
Answer:
cool. No problem ◉‿◉◉‿◉◉‿◉◉‿◉◉‿◉◉‿◉◉‿◉
Please I neeed help, I have to write: four ammonia molecules (NH3) react with four oxygen molecules(O2) to form four nitrogen monoxide molecules (NO) and six water molecules. All substances are in gaseous state and heat is released in the chemical reaction
Answers
Explanation:
the equation must be
4NH3 + 5O2–> 4NO + 6H2O
A piece of charcoal is found to contain
30% of the carbon 14 that it originally
had. When did the tree die from which the
charcoal came? use 5600 years as the
half-life of carbon 14.
A) 9709.46
B) 9708.33
C) 9708.34
D) 9709.45
Answers
Answer: The tree died 9709.46 years before.
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant = 100
a - x = amount left after decay process = [tex]\frac{30}{100}\times 100=30[/tex]
a) to find rate constant
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{5600years}=1.24\times 10^{-4}years^{-1}[/tex]
b) to know the age
[tex]t=\frac{2.303}{1.24\times 10^{-4}}\log\frac{100}{30}[/tex]
[tex]t=9709.46years[/tex]
The tree died 9709.46 years before.
What two reactants are necessary in order for a hydrocarbon combustion reaction to take place?
Answers
Answer:
A hydrocarbon and oxygen
Explanation:
hydrocarbon is being burned, and oxygen is necessary to burn things
To solve such this we must know the concept of Combustion reaction. The two reactants that are necessary in order for a hydrocarbon combustion reaction to take place are hydrocarbon and oxygen.
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side.
Combustion reaction is a reaction in which a substance, basically hydrocarbons burns in presence of oxygen to produce carbon dioxide and water. The two reactants that are necessary in order for a hydrocarbon combustion reaction to take place are hydrocarbon and oxygen.
Therefore, hydrocarbon and oxygen are two reactant that are necessary in order for a hydrocarbon combustion reaction to take place.
Learn more about the balanced equation, here:
https://brainly.com/question/7181548
#SPJ2
Why would people with sickle-cell anemia get tired more easily than healthy people?
Answers
Explanation:
Because sickle-cells have trouble traveling through the smallest blood vessels, which means that muscles and tissue are not getting oxygen they need.
an elephant puts a force of 30,000 N on its four feet,
which have a total area of 7,500 cm². What is the pressure
it puts on the ground
Answers
Explanation:
pressure is Force/area
30000/0.75
Number 12 plsssssssssssssssssss
Answers
Answer:
check my explanation
Explanation:
it is the secondary consumer because it doesn't eat grass
What is the formula for dinitrogen pentoxide?
A) NO5
B) N5)2
C) N2O5
D)N2O7
Answers
Explanation
B) N5)2 hopefully
Which substance is a binary acid?
1,)hydrochloric acid
2.)phosphoric acid
3.)nitrous acid
4.)sulfuric acid
Answers
Answer:
1. Hydrochloric acid
Explanation:
Hydrochloric acid
Answer:
4)
Explanation:
formula:H2 SO4
there are 2 H+ ions in 1 molecule of sulfuric acid
thus it has a basicity of 2
what is the enthalpy of the overall chemical reaction ch4(g)+4cl2(g)- ccl4(g)+4hcl(g)?
1. -205.7kj
2. -113.4kj
3. -14.3kj
4. 78.0kj
Answers
Answer:
-205.7kj
Explanation:
Now adding reaction 2 and twice of reaction 3 and reverse of reaction 1, we get the enthalpy of the reaction.
The expression for enthalpy for the following reaction will be,
where,
n = number of moles
Now put all the given values in the above expression, we get:
Therefore, the enthalpy of the following reaction is, -205.7kj
A car travelled at the speed of 10 mls in 35 calculate the distance covered.
Answers
Hope this helps!
What type of chemical replacement is RbNO3 + BeF2 →Be(NO3)2 + RbF
Answers
Answer:
Double replacement
Explanation:
