Answer:
A. An atomic nucleus is positively charged because it is composed of neutrons.
Explanation:
if a bike travels 23m at constant speed 5289s what is the bikes speed?
Answer:
0.004 m/s
Explanation:
Given data:
Distance traveled = 23 m
Time taken = 5289 s
Speed of bike = ?
Solution:
Formula:
speed = distance / time
b y putting values,
speed = 23 m/ 5289 s
speed = 0.004 m/s
What happens during chemical reactions?
O A. The total amount of energy changes
O B. Total mass increases in the products
O C. Energy is given off or absorbed
O D. Atoms are changed into new elements
Answer:
D. Atoms are changed into new elements.
Explanation:
atoms rearrange to form one or more different substances.
Hope that helps!!!
Sorry if its worng :(
Answer:
It's actually C. Energy is given off or absorbed.
Explanation:
"All chemical reactions involve changes in energy. This may be a change in heat, electricity, light, or other forms of energy. Reactions that absorb energy are endothermic. Reactions that release energy are exothermic."
-LibreTexts Chemistry
Write the name for CH2.
calculate the percentage of calcium in calcium chlorate
Answer:
19.4%
Explanation:
Calcium Chlorate is Ca(ClO3)2
Now calculate the molar mass of Ca(ClO3)2
Ca = 40.1
Cl = 35.5
O = 16.0
But they are two chlorine atoms and six oxygen atoms. So you do this:
40.1 + 35.5(2) + 16.0(6) = 207.1 grams
Now find the molar mass of just calcium.
There is only one calcium atom.
So you do this.
40.1(1) = 40.1
Now divide the molar mass of calcium by the molar mass of calcium chlorate.
40.1 / 207.1 = 0.1936
0.1936 rounds to 0.194
Now multiply 0.194 * 100 and you will get 19.4
So the final answer is 19.4%.
Hope it helped!
true or false
1. Average atomic mass is the mass of any atom based on its nuclear particles in relation to units measured in amu which is 1/12th of a carbon atom.
2. When calculating the average atomic mass of an element, the average atomic mass value falls closest to that of the least percentage abundance (least common) isotope.
Answer:
true
Explanation:
calculating the average atomic
The electron structure of atoms in elements A and C are 2, 8, 1 and 2, 8, 18, 7, respectively. The formula for the compound formed between A and C will be AC. True or false? pls help me T^T
What is produced when an acid and an alkali react?
A. Water and a base
B. Water and Carbon dioxide
C. Salt and a base
D. Salt and water
Comparin
List three characteristics of chemical reactions
and three characteristics of nuclear reactions.
DONE
Answer:
Chemical reactions involve the loss, gain, or sharing of electrons, but do not involve changes to the nucleus of an atom. Nuclear reactions involve changes to the nucleus and produce a new particle. Chemical reactions involve low energy changes. Chemical reactions never involve a change in the mass of atoms.
List three characteristics of chemical reactions, I have five:
occur when bonds are broken and formed
atoms remain unchanged though they may be rearranged
involve only valence electrons
reaction rate is influenced by, temp, pressure, concentration, and catalyst
Three characteristics of nuclear reactions, I have five:
occur when nuclei emit particles
atoms are often converted into atoms of another element
may involve protons, neutrons, and electrons
reaction rate is not normally affected by temp, pressure or catalyst
Please select the word from the list that best fits the definition How far something moves in a specific amount of time
Answer:
Speed
Explanation:
That is what I believe the word to the definition, How far something moves in a specific amount of time, but you'd have to providea picture of the list of words for me to be sure...
What are natural disasters that are NOT in Florida?
A: Tsunami
B: Earth quakes
C: Sand Storm
D: Hurricanes
E: Storm
A species is a specific kind of living thing.
True
False
Answer:
I think the answer is true
the heat of fusion of aluminum is 95 cal/g. calculate how many grams of aluminum(already at its melting point) could be melted with 1,265,730 cal of energy (round your answer to two decimal places)
Given
Lf=latent heat of fusion of Al = 95 cal/g
Q = 1,265,730 cal
Required
mass of Aluminium
Solution
The heat to change the phase can be formulated :
Q = m.Lf (melting/freezing)
Input the value
1,265,730 cal = m . 95 cal/g
m = 1,265,730 cal : 95 cal/g
m = 13323.47 g
Identify the metals in period 3 on the periodic table
Answer:
Aluminum (Al) is the only metal in period 3 on the periodic table.
How will you process the information in the table and on the map to
make predictions? Describe how you will use the inputs to develop
an output.
Help
Answer:
By measuring through scale
Explanation:
CAN YOU TELL THE NAME OF COUNTRY BECAUSE I AM FROM NEPAL
i need help with this
Answer:
It would be the last one because the way earth is tilted the sun rays would be pointing at the Northern Hemisphere more than the Southern Hemisphere
five more than one third of a number is nine .
Answer:
uh
Explanation:
5+x/3=9
=x/3=9-5
=x=12
Which of the following statements about tobacco use is not true?
a. Nicotine narrows blood vessels and puts added strain on the heart.
b. Smoking improves athletic performance.
c. Smoking can wreck lungs.
d. Nicotine in smokeless tobacco is addictive.
Explanation:
b and c statements are not true
if it helps you then plzz mark me brainliest
Answer:
B.) Smoking improves Athletic performance
Explanation:
A force that does not have a high amount of effect
Answer:
yes
Explanation:
its not that hard to get
2. K2SO4 + NaOH what comes next ?
Answer: [tex]K_2SO_4(aq)+2NaOH(aq)\rightarrow Na_2SO_4(aq)+2KOH(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The balanced chemical equation is:
[tex]K_2SO_4(aq)+2NaOH(aq)\rightarrow Na_2SO_4(aq)+2KOH(aq)[/tex]
72.40% iron,27.60% Oxygen Empirical formula
Explanation:
Fe. O
72.40/ 56 27.60/16
____________________
1.29/1.29 1.725/1.29
_____________________
1. :. 1
Emperical formula = FeO
Empirical formula is the whole number ratios of elements in a compound. It can be found from the number of moles. The empirical formula of iron and oxygen of 72.4 % and 27.6 % respectively is Fe₂O₃.
What is empirical formula?Empirical formula of a compound is the chemical formula derived from the number of moles each element present in it. Whereas, molecular formula is derived from the actual masses of the elements present in the compound.
Empirical formula can be determined from the number of moles of the elements. It is given that the mass percentages of iron and oxygen are 72.40% and 27.60% respectively. This can be taken as 72.40 g and 27.60 g in a 100 g of compound.
Thus there is 72.40 g of iron. The atomic mass of Fe = 55.85 g/mol
Thus number of moles of Fe = 72.40 / 55.85
= 1.295
The weight of oxygen in 100 g of compound is 27.60 g. Atomic mass of oxygen is 16 g/mol.
Thus number of moles of oxygen = 27.60 /16 = 1.725
Taking the ratios of these number of moles = 1.295 :1.725 = 2 :3
Hence, the ratios of iron to oxygen is 2:3 which means the empirical formula of the compound is Fe₂O₃.
To find more about empirical formula, refer the link below:
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Can you help me with this 19 points
Answer:
21
Explanation:
To find the total atoms.
Multiply 3 *2 and you will get 6
Then multiply 3 * 5 and you will get 15.
You do this because there is 3 as a coefficient and is before the chemical compound. Furthermore, that means the same thing as a parenthesis.
Last of all, add 15 + 6 and you will get 21.
Therefore, there are a total of 21 atoms.
What is the name of a molecule which is composed of two
phosphorous atoms and four sulfur atoms?
The name of a molecule which is composed of two phosphorous atoms and four sulfur atoms is phosphorus sulphide.
What is molecule ?According on the context, the word may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms bound together by attractive forces known as chemical bonds.
A molecule is the smallest unit of any material that is composed of one or more elements and is capable of existing independently while maintaining all of the substance's physical and chemical characteristics. Further atom division occurs within molecules. For instance, the symbols for the oxygen atom and molecule are O and O2, respectively.
Thus, The name of a molecule which is composed of two phosphorous atoms and four sulfur atoms is phosphorus sulphide.
To learn more about molecule follow the link below;
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Chemistry
Definition in your own words
Will check if you got it from online.
Word: Solid
Answer:
A solid is a matter that has particles that are closely packed which as a result makes it vibrate but not flow.
John rode his bike down the street to the east. He rode 100 meters in 25
seconds. What was his velocity?
A. 0.25 m/s east
B. 25 m/s east
C. 10 m/s east
D. 4 m/s east
Answer:
The answer is D.
Explanation:
Given that velocity also applies speed formula, S = D ÷ T where D represents distance and T is time :
S = D ÷ T
S = 100m ÷ 25s
S = 4m/s
V = 4m/s east
The difference between speed and velocity is that speed has only magnitude but velocity has magnitude and direction.
Is the cell wall factory part or worker? And please explain what the worker or factory part does. (Don’t tell me it’s on quizlet bc I can’t find it)
The lattice energy for ionic crystals increases as the charge on the ions _____________ and the size of the ions __________________. Group of answer choices decreases, increases decreases, decreases increases, increases increases, decreases
Answer:
increases
and the 2nd one increases
describe some acidic oxides that can be prepared by the thermal decomposition of nitrates and carbonates
In an experiment to displace
from copper sulfate, 6.5g of Zinc was
added to an excess of copper(ii) sulfate
Solution. The copper was fitered off,
washed and dried. The mass of
Copper obtained was 48 g. Calculate
the percentage yield of copper?
The percentage yield of copper = 76%
Further explanationGiven
6.5g of Zinc
The mass of Copper: 4.8 g
Required
The percentage yield of copper
Solution
Reaction
Zn+CuSO₄⇒Cu+ZnSO₄
mol Zn :
= mass : Ar Zn
= 6.5 g : 65,38 g/mol
= 0.0994
From the equation, mol ratio of Zn : Cu = 1 : 1, so mol Cu = 0.0994
Mass Cu (theoretical) :
= mol x Ar Cu
= 0.0994 x 63,546
= 6.316 g
%yield = (actual/theoretical) x 100%
%yield = (4.8/6.316) x 100%
%yield = 76%
A simplified version of the Periodic Table of the Elements is provided. What type of elements would you most likely find in the circles portion?
Answer:
Transition elements are present in this region.
Explanation:
2. How many moles are in 2.43 x 1024 particles of Carbon Monoxide
(CO)?
Answer:
= 14.63 × [tex]10^{45}[/tex] particles.
Explanation:
According to Avogadro's priciple:
1 mole of any substance is 6.02 × [tex]10^{23}[/tex] particles
∴ 2.43 x [tex]10^{24}[/tex] moles × 6.02 × [tex]10^{23}[/tex]
= 14.63 × [tex]10^{45}[/tex] particles.
I hope this was clear and easy to understand.