Answer:
Two
Explanation:
Answer:
two or more than two elements.
Find the average atomic mass for boron if 19.9% of boron atoms have a mass of 10.0129371 amu and 80.1% have a mass of 11.0093055 amu. Round to 3 significant figures.
Answer:
Average atomic mass = 10.8 amu
Explanation:
Given data:
Average atomic mass = ?
Percentage of boron having mass 10.0129371 amu = 19.9%
Percentage of boron having mass 11.0093055 amu = 80.1%
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (19.9×10.0129371 )+(80.1×11.0093055) /100
Average atomic mass = 199.3 + 881.8 / 100
Average atomic mass = 1081.1 / 100
Average atomic mass = 10.8 amu.
If an object what is 30 kg of mass is moving at 10 m/s to the right how much kinetic energy does it have
Explanation:
m=30
v=10
K.E=1/2mv^2
=1/2×30×10^2
=1/2×30×100
=1500 joule
Can some answer this please?
Which of these describes a chemical property of a substance?
A. Sugar's tendency to dissolve in water
B. Paper's tendency to tear
C. Gold's tendency to stay shiny
D. Wax's tendency to melt at 37 Celsius
Answer:
i think its C
Explanation:
Wax's tendency to melt can describe a chemical property of a substance. Therefore, option (D) is correct.
What is a chemical property?A chemical property can be described as any of a material's properties that becomes evident during a chemical reaction. Any quality can be established only by changing the chemical identity of the substance. Chemical properties cannot be evaluated by viewing or touching the substance.
The internal structure of the substance must be affected greatly for its chemical properties to be investigated. When a substance undergoes a chemical reaction, its properties will change drastically, resulting in a chemical change.
Chemical properties are contrasted with physical properties and can be used for building chemical classifications. They are also useful to identify an unknown substance.
As the wax melt, it also burns and hives the carbon dioxide, water, heat, and light. Therefore, the wax's tendency to melt and burn is a chemical property.
Learn more about chemical property, here:
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what partie is found outside of the nucleus
Answer:
Electrons
Explanation:
Answer:
electrons
Explanation:
PLEASE HELP HELP I NEED THIS ASAP
The net charge on a sulfide ion (S2-) is
-2. Explain how this ion obtains its
charge. Your answer
should include a discussion of
subatomic particles.
Explanation:
A sulfide ion S²⁻ is formed from sulfur atom.
An ion is an atom that has lost or gained electron.
Sulfur atom is made up of 16 electrons according to its position on the periodic table.
In essence, there are 16 negatively charged particles in an atom of sulfur.
Also, in the neutral or uncharged state, the number of electrons equals to the number of protons.
So, there are 16 electrons and protons in an atom of sulfur.
Every atom tends to be like the noble gases. Noble gases have complete octets. So, for sulfur to have a complete octet, it must gain two more electrons to be isoelectronic with Argon. Now, the number of electrons becomes 18;Charge = Number of protons - Number of electrons
Charge = 16 - 18 = -2
12. What are two different ways to turn a turbine to generate electricity without using fossil
fuels?
HELPP
Answer:
two different ways are 1st by using water and 2nd by using wind these also not harm our environment
Periodic Table Puzzle Test
Answer:
dfmpfndtngognjf
Explanation:
Balance the given
equation
SnO → Sn + O2
Sn
Sn
О
O
Explanation:
the balanced equation is: .........
Answer:
i agree with her/him^^^^^^^^^^^^^^^^^^^^^^
Explanation:
3. Heating by direct contact between particles is called
PLEASE HELP!!! Which type of substance is gold an example of?
A. an alloy
B. a compound
C. a molecule
D. an element
Answer:
Hello!
Gold is a chemical element with symbol Au (from Latin: aurum) and atomic number 79. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal and a group 11 element.
So in short, the Correct Answer will be (D) an Element.
Hope that Helps! Have A Wonderful Day! ☺
Explanation:
Gold is an example of chemical element with symbol Au aurum and atomic number 79, lightly reddish yellow, dense, soft, malleable, and ductile metal.
What is the difference between atomic number and atomic mass ?Atomic number of an element is defined as total number of protons present in the nucleus, neutrons carry no net electrical charge, so it is the charge number of the nucleus.
atomic mass of an element can be defined as the atomic weight is measured total mass of an element’s atom, the total number of neutrons and protons in the nucleus of an atom.
Both Atomic mass and an atomic number of elements are closely related if atomic number is high, then the atomic mass is also said to be high.
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What is the wavelength of an electromagnetic wave that travels at 3 x 10^8 m/s and has a frequency of 60 mhz? (1 mhz = 1,000,000 hz)?
Answer:
5m
Explanation:
Given parameters:
Speed of wave = 3 x 10⁸m/s
Frequency = 60mhz = 60 x 10⁶Hz
Unknown:
wavelength = ?
Solution:
To solve this problem;
we use the expression:
V = F ∧
V is the velocity
F is the frequency
∧ is the wavelength
Now insert the parameters and solve;
3 x 10⁸ = 60 x 10⁶ x ∧
So;
∧ = 5m
How many moles of carbon would 50.0 g of carbon represent?
Answer:
600 grams
Explanation:
The value of the mole is equal to the number of atoms in exactly 12 grams
12x50=600
1. Do you think that the lightbulb and the Moon spheres are "to scale" compared to the real
sizes of the sun and the Moon?
Answer:
Yes
Explanation: Had a question like this and I said yes and got it right
6. Steel is a metallic-like material but it is not a pure element. It is a alloy.
True
False
Answer:
true
hope this helps! have an amazing day!
I need help pls and thank you
3 CACO3+2H3PO4>CA3(PO4)2+3 CO2+3 H2O
Answer:
its hto-567-st-3=56+78=103
Explanation:
so103 is yo answer
Are the pieces of paper natural or charged?
Answer:
natural
Explanation:
what is the mass of 2.50 mol of (C3H5)2S
Hey there!
We need to start this by finding the molar mass of (C₃H₅)₂S.
This molecule consists of 6 carbon atoms, 10 hydrogen atoms, and one sulfur atom. We need to add the molar masses of each atom up.
C: 6 x 12.01 = 72.06
H: 10 x 1.008 = 10.08
S: 1 x 32.07 = 32.07
-------------------------------
114.21 g/mol
Ok, now that we have established that the molar mass of (C₃H₅)₂S is 114.21 g/mol, we have 2.50 mol of (C₃H₅)₂S. If 1 mol has a mass of 114.21 g, then 2.50 mol will have a mass of 2.50 time 114.21.
2.50 x 114.21 = 285.525 grams
This should go to just three significant figures, so:
The mass of 2.50 mol of (C₃H₅)₂S is 286 grams.
Hope this helps!
How many atoms are in 0.00100 mole of Na?
Answer:
6.02x10^23 atoms i think
Explanation:
True or False, In a neutral atom, the number of protons is equal to the number of neutrons
Answer:
False
Explanation:
In a neutral atom, the number of protons is not necessarily equal to the number of neutrons.
In such atom, the number of protons is equal to the number of electrons.
Protons are the positively charged particles in an atom. Electrons are the negatively charged particles in an atom. Neutrons do not carry any charges.When the number of protons and electrons are the same, a neutral atom is formed.
When a molecule loses or gains an electron it becomes
When a molecule loses or gains an electron it becomes an ion.
"If it gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion."
Answer:
the molecule become an iron
Explanation:
have a great day
12. What is the mass number of an atom that has 4 protons, 4 electrons, and 5 neutrons?
Answer:
9
Explanation:
mass number = protons + neutrons
= 4 + 5 = 9
Determine the mass of 21.05 moles of iron(III) sulfide.
Answer:
The mass of 21.05 moles of iron(III) sulfide is 4,372.085 grams.
Explanation:
Iron (III) sulfide is a chemical compound with the formula Fe₂S₃.
Being the molar mass of the elements:
Fe: 55.85 g/moleS: 32 g/molethen the molar mass of iron sulfide (III) is:
Fe₂S₃= 2* 55.85 g/mole + 3* 32 g/mole= 207.7 g/mole
Molar mass is the amount of mass that a substance contains in one mole. Then the rule of three can be applied: if in 1 mole of iron (III) sulfide there are 207.7 grams, in 21.05 moles how much mass is there?
[tex]mass=\frac{21.05 moles*207.7 grams}{1 mole}[/tex]
mass= 4,372.085 grams
The mass of 21.05 moles of iron(III) sulfide is 4,372.085 grams.
HELP ASAP
Which is involved in the formation of sinkholes?
O acidic rainwater
O
mining
O rising sea level
winds
Answer:
Sinkholes this is the answer
Answer:
B. Mining
Explanation:
trust
Which of the following is NOT an
example of a pure substance?
A. an element on the periodic table
B. a compound made up of chemically-bonded
elements
C. a glass of salt water
Answer:
C would be the answer this question
HELP PLS I WILL GIVE 40 POINTS!!!!
Which statement is true about all physical change?
The molecular composition of the substance remains unchanged.
The changed substance keeps all the same properties.
A permanent change in the substance has taken place.
Atoms rearrange to form a new substance.
name the compound formed when pottasim reacts with bromine
Answer:
the answer is potassium bromide
Answer:
POTASSIUM BROMIDE
Explanation:
At room temperature, potassium reacts with bromine, and by synthesis, this compound is formed. The chemical equation of this reaction is 2 K + Br2 = 2KBr. Potassium bromide has an immense contribution to medical science.
Sn + 2Ha -> SnCl2 + H2
a. synthesis
b. single replacement
C. combustion
d. double replacement
e decomposition
Answer:
your question is totally wrong. there is no cl2 in reactants.
Which of these common substances is a homogeneous mixture?
O
A. table salt
B. pure water
C. whole milk
D. maple syrup
Answer:
whole milk ,table salt , maple syrup
Answer:
d
Explanation: