Answer:
The answer is A
Explanation:
My teacher gave me the answer before the test that we took on 11/12/2020
Hope this helps anyone else who has the same question.
The halogens have similar properties, the correct option is A.
What are Halogens?Halogens are the group 17th compound of the periodic table, It consists of elements like Fluorine(F), Chlorine(Cl), Bromine(Br), and Lodine(I).
The halogens have the following properties.
They all react with hydrogen to create acids.
All of them are fairly harmful.
Salts are easily formed when they react with metals.
Their outer shell contains seven valence electrons.
They are electronegative and very reactive.
Low melting and boiling points characterize the halogens. This is a common characteristic of non-metals.
As you move lower in the group, the melting and boiling points then rise.
The elements have different atomic mass, atomic radius, and a different number of protons.
They are grouped together because they all have similar properties.
To know more about Halogens
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Help QUICK!!
Why is scientific notation used?
A. to round numbers to the nearest whole number
B. to promote reproducibility of data
C. to increase the validity of data
D. to express very large or very small numbers
Answer:
c.to increase the validity of data
Answer:
i think its D
Explanation:
pls tell me if im wrong
Name:
1.
Which formula represents an ionic compound?
A. NaCI
B. N20
C. HCI
D. H2O
Answer:A
Explanation: because it represents a salt which is a nonmetal
Pls help me solve this and I will mark you the Brainiest
Answer:
b
Explanation:
plz mark brailest
How do ionic bonds differ from covalent bonds?
Protons are transferred in an ionic bond.
Protons are shared in an ionic bond.
Electrons are shared in an ionic bond.
Electrons are transferred in an ionic bond.
Answer:
Electrons are transferred in an iconic bond.
Which is it , if you are right I will give brainliest
Answer:
a
Explanation:
what is the density of a man
Answer:
1.0 g per cubic centimeter.
Explanation:
What is the kinetic energy of a 2kg rabbit hopping at a speed of 1.25 m/s
Answer:
What is the kinetic energy of a 2kg rabbit hopping at a speed of 1.25 m/s?1,5625J
Which of the following best describes an electron?
A. It has no charge and about the same mass as a proton.
B. It has a negative charge and much less mass than a proton.
C.It has a positive charge and much more mass than a neutron.
D.It has a negative charge and about the same mass as a neutron.
Answer:
It's D. because it has negative charge and same mass as neutrons
ents in any compound
fixed ratios
2) Glucose is a 6-carbon sugar made by autotrophs in the process of
photosynthesis. It is a compound formed from three elements, carbon,
hydrogen, and oxygen. The ratio of hydrogen to carbon and oxygen in
glucose is always 2.1.1. What is the correct molecular formula for
glucose?
A) CHO
B) CH1 2012
9 CGH12O6
D) CH₂O₃
A sample of ink is put in the center of filter paper . Several drops of ethanol are then put on the ink mark. Two concentric rings of circle are obtained. What is the best conclusion about the ink we can come to? a. It contains two colored substance only b. It contains at least two coloured substances c. It is a compound d. It is broken down by ethanol
Answer:
The correct option is;
b. It contains at least two colored substances
Explanation:
In chromatography, a mixture is separated into its components, such that in the filter paper, on which the drops of ethanol are then placed on the ink mark, we have different phases of the components of the mixture that have different levels of mobility by capillary action through the filter paper. Therefore, given that two concentric rings of circles are obtained, we have that each ring is composed of a different component of the mixture and there are therefore, at least two colored substances.
Decreasing the volume of a gas increases the pressure of the gas. .
Answer:
False.
Explanation:
If the gas is leaving it cannot have higher pressure.
how much heat energy is required to melt 40g of sodium chloride at its melting point
Answer:
173.2 C
Explanation:
have a good day
21 kJ of heat are required to melt 40 g of sodium chloride at its melting point.
The standard enthalpy of fusion of NaCl is 0.52 kJ/g, that is, it takes 0.52 kJ of heat to melt 1 g of NaCl at its melting point. The heat required to melt 40 g of NaCl is:
[tex]40 g \times \frac{0.52kJ}{g} = 21 kJ[/tex]
21 kJ of heat are required to melt 40 g of sodium chloride at its melting point.
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True or False : Scientists know perfectly and exactly every single thing about the Universe’s birth, and there is nothing left to discover
Answer:
False
Explanation:
The Universe's birth is only a theory. The theory has changed over the years, but currently the most believed theory is the Big Bang Theory. Also, there is always more to discover
What is the predicted outcome for very low mass stars (those that are smaller than about the mass of the sun)?
Answer:
In case of low-mass stars,the outer layers of the low mass stars are expelled as the core collapses such that the outer layers form a planetary nebula.
Explanation:
In case of low-mass stars,the outer layers of the low mass stars are expelled as the core collapses such that the outer layers form a planetary nebula. The core remains as a white dwarf and finally become a black dwarf as it cools down. A low mass star consumes its core hydrogen and turns it into helium over its lifetime.
Explain how cooking is a real
world example that models how
the atoms from the reactants
rearrange and come together in
different arrangements to form
new substances.
Answer:
Explained below
Explanation:
In chemistry, the process of a chemical change is when the atoms from the reactants rearrange themselves and bond together differently to form one or more new substances with different characteristics than the reactants. Now, after this new substance is formed, the change is called a chemical change.
Now, in cooking Food will undergo a chemical change as it is being cooked. For example, when we boil brown meat, we are causing reactions that change the chemical composition in ways that enhance flavors. Proteins and fibers such as beans when cooked are broken down or undergo denaturation thereby making digestion easier when eaten. Fats like cooking oils are melted while Eggs when boiled are coagulated.
what is the form of
energy that
refers to the
motion of
particles
1.) Nonmetallic elements form ions by (Losing/Gaining) valence electrons in order to complete their outer shell. 2.) The (Fewer/More) valence electrons an element has in its outer shell, the easier it is to complete. 3.) The (FewerMore) electron shells an element has, the easier it is to fill its outermost shell. 4&5.)Reactivity in nonmetals (Increases/Decreases) as you go from left to right in a group, and (Increases/Decreases) as you go from top to bottom.
Answer:
1) Gaining
2) More
3) More
4) increases
5) decreases
Explanation:
Nonmetals are found towards the right hand side of the periodic table. They form ions by gaining electrons due to the fact that they have more electrons in their outermost shell, hence they only need a few electrons to complete the octet structure.
As the number of shells increases, the outermost shell becomes more populated and easier to fill with electrons.
The reactivity of nonmetal elements generally increases from left to right across the periodic table but decreases from top to bottom down the group.
Answer:
1) Gaining
2) More
3) fewer
4) increases
5) decreases
Explanation:
Is 2AI+3O2= 2AI2O3 balanced or unbalanced
Answer:
balance
Explanation:
because you just add together but they just switch the 2 and 3
A graduated cylinder is filled with 50.7 mL of water. If a 10.0 g piece of zinc metal is added to the water, and the volume rises to 52.1 mL, what is the density of the metal?
Answer:
The answer is 7.14 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 10 g
volume = final volume of water - initial volume of water
volume = 52.1 - 50.7 = 1.4 mL
We have
[tex]density = \frac{10}{1.4} \\ = 7.142857...[/tex]
We have the final answer as
7.14 g/mLHope this helps you
why ie of nobel gases are very high
Answer:
noble gases are very high because they have the maxium amount of electrons in their outer shell
Explanation:
PLEASE HURRY WILL MARK BRAINLIEST
Which number line shows the graph of x 11?
Can someone please help me I really need help
Answer:
atoms from different elements
At what time of day is sunlight strongest - in the early morning (when the Sun has just risen)
or at noon (when the Sun reaches its highest point)?
Answer:
noon is the answer. Hope it helps
Answer:
Noon
Explanation:
Hope this helps <3
will someone help me, please
Answer:
c makes sense
Explanation:
if your just sitting there looking at it melt, thats not helping
Answer:
A
Explanation:
Different sizes of ice cubes will result in different lengths of time in staying solid. A bigger ice cube will stay solid for longer than a smaller one.
How many significant figures in 0.002010 ?
00
P: 7
N: 78
What is the name of the element in this diagram?
O Boron
O silicon
O nitrogen
oxygen
Answer:
Nitrogen
Explanation:
:) pls mark brainliest
Answer:
Nitrogen
Explanation:
To find your answer, pay attention to the number of protons. Protons define an element's atomic number.
1) Describe the characteristics of molecular compounds that affect their particular physical
properties. (Include melting/boiling points, strength of bonds, reactivity, and 3-dimensional
geometry.)
_________energy is stored in chemical bonds.
Answer:
Chemical energy is the potential energy stored in the arrangement of atoms within molecules. Breaking chemical bonds requires energy, while forming new chemical bonds releases energy. The more energy that's released when a bond forms, the more stable that bond is.
Explanation:
The chemical formula for sodium sulfate is Na2SO4. How many sulfur atoms are in the formula for sodium sulfate?
Answer:
1
Explanation:
there is only one sulphur (S) atoms in the formula for sodium sulphate
The chemical formula for sodium sulfate is Na₂SO₄.One sulfur atoms are in the formula for sodium sulfate.
What is chemical formula ?The term chemical formula shows the elements that create the compound and the numbers of atoms of each element in the smallest unit of that compound, be it a molecule or a formula unit.
Chemical formulas are classified into three types: empirical, molecular, and structural.
Empirical formulas depict the simplest whole-number ratio of atoms in a compound, whereas molecular formulas depict the number of each type of atom in a molecule and structural formulas depict how the atoms in a molecule are bonded to each other.
Thus, the chemical formula for sodium sulfate is Na₂SO₄. In sodium sulphate two molecules of sodium, one atom of sulfur, and four atoms of oxygen are present.
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Which type of reaction has will give brainliest to first correct answer
the general formula of AB + CD → AD + CB?
ОООО
synthesis
decomposition
oxidation
replacement
Answer:
I think it's replacement because the B and D just swap places in the end equation
Answer:
that would be replacment
Explanation:
if you look at the formula the B and D are replaced with each other
synthesis is when it looks like A+B--> AB
decompositions looks like AB--> A+B
and oxydation is when the states of atoms are changed so it would include things like +1, -1 etc
