Answers
Answer:
A and b
Explanation:
Related Questions
Which of the following is the best insulator?
Group of answer choices
copper
aluminum
gold
wood
Answers
Answer:
wood
Explanation:
hope this helps! good luck on ur test :)
Answer:
Wood
Explanation:
How do slab pull forces affect plate motion? Choose the correct answer.
Uplifted mantle causes plates to move apart.
Convection currents drive the plate downward to move it.
Earthquakes break the crust into smaller plates to make motion easier.
The weight of the subducted plate produces a force to continue moving the plate.
Answers
Answer:
The weight of the subducted plate produces a force to continue moving the plate.
Explanation:
The first noble gas with a Lewis Structure with 8 dots is
A. Ar
B. Kr
C. He
D. ne
Answers
Answer:
C) He
Explanation:
Helium is one of the noble gases and contains a full valence shell. Unlike the other noble gases in Group 8, Helium only contains two valence electrons.
How can you move a object without making contact?
Answers
Answer:
The Force
Explanation:
Which is the best description of a molecule?
Answers
Answer:
A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms.
Answer:
C
Explanation:
How does a balanced chemical equation demonstrate conservation of mass?
Answers
Answer:
A balanced chemical equation will demonstrate the law of conservation of mass because the amount of elements on one side (reactants) will equal the amount of elements on the other side (products).
Explanation:
CH₄ + 4Cl₂ -> CCl₄ + 4HCl
Reactants:
1 C
4 H
8 Cl
Products:
1 C
4 H
8 Cl
Lithium has two isotopes, lithium-6 weighing 6.015 amu (7.5% abundance), and lithium-7
weighing 7.016 amu (92.5% abundance). What is the atomic mass of lithium?
with calculations
Answers
Answer:
The answer is 6.941 but I dont really have the explanation
Explanation:
The atomic mass of lithium will be 6.9458 amu.
What is Atomic Mass ?
The mass of an atom of a chemical element expressed in atomic mass units.
It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
Calculation :
Consider 10000 atoms of Li ;
742 of them would have mass 6.02.9258 of them would have mass 7.02.
Hence,
The total mass of these 10000 Li atoms would be ;
(742 × 6.02) + (9258 × 7.02) = 69458
∴ 1 Li atom on average would have mass = 69458 / 10000 = 6.9458 amu
Therefore, The atomic mass of lithium will be 6.9458 amu.
Learn more about Atomic Mass here ;
https://brainly.com/question/17067547
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Consider the equation:
Ca+O2→CaO
What needs to be done in order to balance the equation?
Place a 2 in front of the Ca and the CaO.
Place a 2 in front of the O2 and the CaO.
Place a 2 in front of the CaO only.
Place a 2 only in front of the Ca.
Answers
What number do you never write as a coefficient?
Answers
Answer:
When no coefficient is written in front of a formula it is assumed to be 1. 4. Numbers appearing in the formulas are known as subscripts. These can never be changed when balancing the equation or you will change the identity of the substance.
Explanation:
1. Reactants go on the left hand side and products go on the right hand side of a chemical equation. Be sure to write the correct formulas for the reactants and products.
· Remember atoms are conserved in a chemical reaction. ie they are neither created or destroyed. So all the atoms in the reactants must end up somewhere among the products.
2. Count the number of atoms of each element, compound or ion in the reactants and products. If they are not equal proceed further.
3. Balance the atoms one at a time by placing coefficients in front of the formula so that the numbers of atoms of each element are equal on both sides of the equation. Remember atoms may exist in an element, compound or ion.
· It is usually easier to start with the atoms that occur in only one substance on each side of the equation.
· Balance the atoms that occur in compounds before attempting to balance atoms that occur in elemental form. e.g. H2, O2 or Cl2
· To make it easier if a polyatomic ion appears unchanged on both sides of the equation treat it as a whole unit.
· When no coefficient is written in front of a formula it is assumed to be 1.
4. Numbers appearing in the formulas are known as subscripts. These can never be changed when balancing the equation or you will change the identity of the substance.
· Remember with subscripts, any number to the right of parentheses multiplies each subscript within the parentheses.
eg Fe2(SO4)3 contains 2 Fe atoms, 3 S atoms and 12 O atoms.
5. Finally make sure that all the coefficients are in the smallest possible whole number ratio.
The number which we will never use as a coefficient in any chemical reactions are decimals and fractions.
What are coefficients?Coefficients are the numbers which are written before any chemical entity of any chemical reaction.
Coefficients of any reaction will not be:
Coefficient should always be a whole number.Decimal numbers or fractional numbers are not used as a coefficient.Coefficients are generally use for balancing the chemical reactions.
So, we will not use decimals and fractions as a coefficient.
To know more about coefficient, visit the below link:
https://brainly.com/question/2735017
help please I will give brainliest to the best answer
Answers
Answer:
the correct answer is D
How many number of oxygen molecules are required to produce 0.22 g of CO2 according to the reaction?
c+o2=co2
Answers
n=.22/44=.005 mole of CO2
from the equation we see the relationship between the moles of co2 and O2 and we find that they have the same number of moles
So we need .005mole of O2
Multiple the number of moles with avogadro’s number to know the number of O2molecules
.005x6.022 x10^23
Select the correct answer
Giving brainliest
Answers
Answer:
D
Explanation:
what mineral characteristics does cubic zirconia meet ?
Answers
Answer:
it is hard.. harder than some natural gems
How can electronegativity be used to explain the reaction we see in terms of the numbers and types of bonded being formed in lithium?
Answers
Explanation:
Lithium is an electropositive element that readily loses electrons.
Oxygen is electronegative and it will readily accept electrons.
Due to this significant electronegativity differences between the two species they form electrovalent or ionic bonds between them.
2atoms of Li lose two electrons:
Li → Li²⁺ + e⁻
Lithium isoelectronic with helium
For oxygen;
O + 2e⁻ → O²⁻
Oxygen is isoelectronic with Neon
Two ions of the lithium combines with the oxygen to form the bond;
4Li + O₂ → 2Li₂O
The electrostatic attraction between the two ions forms the ionic bond
7th grade help me plzzzzzzzz
Answers
Answer:
1. Metals
2. Solid, gas, liquid
Explanation:
For #1:
The majority of elements in the periodic table are classified as metals. The transition metals lie in the center of the table, spanning groups three through 12. These elements are solid at room temperature, except mercury, and have the metallic color and malleability expected of metals.
Hope this helps :)
Select The TWO answers that are correct, Put trust in your answer brainliest
Answers
Answer:
B and C
Explanation:
Answer:
Cumulonimbus and Cirrus clouds
Explanation:
Why are supergiant so bright?
Answers
Because supergiants are so massive, the core temperature gets much hotter than in giants, so supergiants can fuse elements heavier than hydrogen and helium. But to support their tremendous mass, supergiants burn up their fuel much more quickly.
Answer:
because the core tempature gets much hotter.
Explanation:
so supergiants can fuse elements heavier than hydrogen and helium. But to support their tremendous mass, supergiants burn up their fuel much more quickly.
Refer to the above image. Which of these is NOT found in the nucleus of an atom?
A
Neutrons
B
Protons
С
Atomic mass
D
Electrons
Answers
Answer:
Atomic mass
Explanation:
I got it right on my test
define open and closed circuit
Answers
Answer:
An open circuit is one where the continuity has been broken by an interruption in the path for current to flow. A closed circuit is one that is complete, with good continuity throughout. A device designed to open or close a circuit under controlled conditions is called a switch.
Closed circuit doesn’t allow current to pass
How much eat is absorbed when 50.0g of water changes from 25.0 Celsius to 37.0 Celsius?
Answers
2,511 joules or 2.5 kilo joules
Or 2.38 btu
4.186 is specific heat of water per gram per deg C at sea level
Times mass of 50 grams
Times delta T of the water
2530 joules when cross checked by plugging into an online calculator
The compound whose molecules have the highest average kinetic energy is?
Answers
Answer:
C)
Explanation:
The warmer the molecules, the higher the average kinetic energy.
"As stated in the kinetic-molecular theory, the temperature of a substance is related to the average kinetic energy of the particles of that substance. When a substance is heated, some of the absorbed energy is stored within the particles, while some of the energy increases the motion of the particles. This is registered as an increase in the temperature of the substance." -lumen learning
(I know for sure but what think... hope this helped)
How many atoms are in 9.01 grams of
Beryllium (Be)?
Answers
Answer:
the atomic number is 4
Explanation:
the atomic number is 4, thus beryllium contains 4 electrons and 4 protons.
What’s the density in g/cm^3
Answers
Answer:
0.0027 gram/cubic centimeter
cc=ml
Explanation:
pls vote brainliest ❤❤
Which of the following statements are incorrect?
A. A sodium atom has a smaller radius than a potassium atom.
B. A neon atom has a smaller radius than an oxygen atom.
C. A fluorine atom has a smaller first ionization energy than an oxygen atom.
D. All are statements are incorrect
Answers
b is the answer because oxyen atom has a smaller radius
Answer: B
Explanation:
what is atomic mass of sulphir
Answers
Answer:
32.065 u
Explanation:
Which method of fossilization preserves the most detail of an organism?
petrified fossils
frozen or mummified fossils
trace fossils
hollowed fossil cavities
these are the choices
Answers
Answer:
B. frozen or mummified fossils
This is the correct answer :)
Answer:
B the answer
Explanation:
frozen or mummified fossils
The tendency of an atom to attract electrons to itself is ionization energy. effective nuclear charge. electron affinity. electronegativity.
Answers
Answer:
electronegativity
Explanation:
Answer:
THe tendoncy is electronegstivity
Explanation:
Im a big brain person
221 A grocery shop has different types of fruit: one box contains 10 mangos, another
contains 7 avocados and the third box contains 5 lemons.
The same shop has 20% organic food. 50% inorganic food, and 30% of the things they sell
are juices.
3 marks)
A) Represent the types of fruit in bar graph.
B) Represent the sales in pie graph.
Answers
Answer:
A) Please see the required bar graph attached
B) Please see the required pie graph attached
Explanation:
The given data are;
The number of each fruit in each box are;
First box contains 10 mangoes
Second box contains 7 avocados
Third box contains 5 lemons
The percentage of the things they sell are;
Organic food = 20%
Inorganic food = 50%
Juices = 30%
A) The bar graph is plotted with Microsoft Excel
The height of each column is equivalent to the number of fruit in the box
Each column represents a box of fruit
B) The pie graph (chart) is generated with Microsoft Excel
The steps to draw the pie chare are;
1) Draw a circle
2) Partition the circle into segments proportional to each percentage from the center of the circle as follows;
The sum of angles at the center of the circle = 360°
The angle of the segment that will represent the 20% organic food in the pie chart = 20/100 × 360° = 72°
Therefore, the segment representing organic food will have an angle of 72° at the center of the circle
Similarly, the segment representing inorganic food will have an angle of 50/100 × 360° = 180° at the center of the circle
The segment representing juices will have an angle of 30/100 × 360° = 108° at the center of the circle.
Perform the following
mathematical operation, and
report the answer to the correct
number of significant figures.
7.68 x 4.564 = [?]
Answers
Answer:
35.05152
Explanation:
Answer:
35.1
Explanation:
I put that answer in and it was correct.
Sorry, I have another question! Please answer as soon as possible:)
Answers
Answer:
I think its b
Explanation:
Sorry if wrong! Hope this helps tho! maybe mark me brainliest if I am?