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Assessment started: Unit 3 Exam-Retest.
Item 1
If pressure is constant, how is the volume of a gas related to its temperature?
Answer:
A
Explanation:
Trust me i just did this :)
Which element below is Shiny, good conductor of heat and electricity, malleable and ductile? *
1 point
Chlorine
Nitrogen
Magnesium
Neon
Answer:
magnesium
Explanation:
it is the only metal in the choices. everything else is on the right side of the old line that separates metals and nonmetals on the PPT. nonmetals aren't, shiny or good conductors or malleable or ductile. only metals can have those qualities. the only metal is magnesium
PLEASE HELP!! WILL GIVE BRAINLIEST!!! I NEED ANSWER QUICKLY!!!
Check the correct box to describe the periodic trends in electronegativity.
Electronegativity across a period:
decreases.
increases.
Electronegativity down a group:
decreases.
increases.
Electronegativity across a period: increases.
Electronegativity down a group: decreases.
Explanation:
Just did on Edge 2021
Electronegativity across a period increases and Electronegativity down a group decreases.
What is Electronegativity ?Electronegativity, symbolized as χ, is the tendency for an atom of a given chemical element to attract shared electrons when forming a chemical bond.
An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus.
On the periodic table, electronegativity generally increases as we move from left to right across a period and decreases as you move down a group.
As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.
Hence, Electronegativity across a period increases and Electronegativity down a group decreases.
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Select the correct answer. Which substance is made of polymers? A. marble B. protein C. salt D. steel
Answer:
the answer is B proteins
Explanation:
brainliest pls
Answer:
B. protein
Explanation:
A polymer is defined as a molecule which has 'n' number of monomer units.
Similarly proteins are also polymers as they are made up of amino acids and contain a number of repeated units just like polymers.
HELPP ME
express with equations the transformations marked on the scheme
The reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Transformations :
1. CaO + H₂O⇒Ca(OH)₂
2. CaO + CO₂⇒CaCO₃
3. Ca(OH)₂+ 2HCl⇒CaCl₂+2H₂O
4. Ca(OH)₂+H₂CO₃⇒CaCO₃+2H₂O
5. CaCO₃⇒CaO+CO₂
PLEASE HELP!!!!! NEED HELP ASAP!!!!!
Write the chemical formula for the ionic compounds below
EXAMPLE- Calcium Phosphide= Ca3P2
Magnesium chloride=
Aluminum Fluoride=
Lithium Bromide=
Potassium Sulfide=
Answer:
down below
Explanation:
MgCl2
AlF3
LiBr
K2S
Where do convection currents occur?
A.
In areas with the same temperature
B.
In areas with different air pressures
C.
In areas with the same altitude
D.
In areas with different cloud types
Answer:
a because where the air travels for example a radiator
Answer:
C.
In areas with the same altitude
Explanation:
Suggest a change of state, other than ice melting, that is an endothermic
process.
Answer:
Vaporization and Sublimation
Explanation:
Answer:
Well there's solid states, liquid states, and gas states in matter.
is soil a pure or impure substance?
Which explains how to balance the equation ZnSO4 + Li2CO -> ZnCO3 + Li2SO4 ?
A. One reactant and one product needs the coefficient 2.
B. The products both need a 3 coefficient.
C. The reactants both need a 2 coefficient.
D. Atoms in the equation are already balanced.
Explanation:
Atoms in the equation are already in balance.
Answer:
it is d, got it right on EDG
Explanation:
P4 (s) + Cl2 (g) → 4PCl3 (l)
El plomo y el yodo forman dos compuestos. En uno, el porcentaje de en masa de plomo es del 44,94% y en el otro es de 62,02%. Calcula los gramos de plomo por gramos de yodo en cada compuesto
Answer:
0.8162 gramos de plomo por gramo de yodo
1.633 gramos de plomo por gramo de yodo
Explanation:
Asumiendo una base de 100 gramos para cada compuesto:
Primer compuesto:
Gramos plomo: 44.94g
Gramos de yodo: 100-44.94g = 55.06g
Así, la masa de plomo por gramos de yodo para el primer compuesto es:
44.94g plomo / 55.06g Yodo =
0.8162 gramos de plomo por gramo de yodo
Segundo compuesto:
Gramos plomo: 62.02g
Gramos de yodo: 100-62.02g = 37.98g
La masa de plomo por gramos de yodo para el segundo compuesto es:
62.02g plomo / 37.98g Yodo =
1.633 gramos de plomo por gramo de yodo
What is the Molecular mass of sodiumcholoride ?
Answer:
58.5g/mol
Explanation:
Given substance:
Sodium chloride = NaCl
Unknown:
Molecular mass = ?
Solution:
The molecular mass of a compound is the gram-formula mass or gram-molecular weight of the compound.
It is determined by adding its component atomic masses and then express in grams per mole;
Atomic mass of Na = 23g
Atomic mass of Cl = 35.5g
NaCl = 23 + 35.5 = 58.5g/mol
An example of a decomposer is a:
rabbit
mushroom
tulip
Answer:
mushroom
Explanation:
Urgent !!!!!!!!!! Due today plzzzzz help me
Answer:
Explanation:
a. H3O+
b. H3O+
c. CH3C(OH2)+
Identify the following examples as either physical or chemical change.
(Ill give brainliest if right)
Answer:
7. Chemical
8. Chemical
9. Physical
10. Physical
11. Physical
12. Physical
Explanation:
WILL MARK YOU BRAINLEIST What do sound waves need to have to travel from one place to another?
What do sound waves need to have to travel from one place to another?
Question 5 options:
steel
water
air
a medium
Answer:
a medium!!!!
Explanation:
ITS CORRECT!!!! I GOT IT RIGHT ON MY TESTTTTT! I PROMISEEE
What is the connection between the Bohr Model and Atomic emission spectra of elements?
Explanation:
electrons move arround nucleus in the orbit such as sun in suria system..
What does an increase of 1 pH number represent?
Answer:
A one-point pH change indicates the strength of the acid or base has increased or decreased tenfold; a 2-point change indicates a 100-fold change in acidity or alkalinity, and a 3-point change in pH indicates a 1000-fold change. Examples: • An increase in pH from 7.0 to 8.0 means the water is 10 times more basic.
Explanation:
POSSIBLE POINTS: 1
Please read the example carefully and choose the best answer below.
Marie notices that the current cleaner she is using on her shower is not cutting through the hard water build-
up that has accumulated. She decides to purchase 3 other cleaners to see if one of them will do a better job
of cutting through the stains. Marie places masking tape in the dry shower to create 5 sections for her
experiment. She sprays 3 squirts of one cleaner per section and leaves the remaining section untouched to
compare her results. After 30 minutes, and without scrubbing any of the cleaner in, she records her
observations.
In this example what is the independent variable?
Answer:
CLEANER
Explanation:
Independent variable is the variable in an experiment that is changed or manipulated by the experimenter in order to bring about a measurable response.
In this question, Marie notices that the current cleaner she is using on her shower is not cutting through the hard water build-up that has accumulated. She decides to purchase 3 other cleaners to see if one of them will do a better job of cutting through the stains. The CLEANERS being changed in this experiment is the INDEPENDENT VARIABLE.
HELLLLPPPPPPP
Which of the following is the correct term for the chemical reaction that forms polymers?
A. Displacement
B. Oxidation
C. Polymerization
D. Monomerization
1. What is the name of the ion formed from the sulfur atom?
Sulfuride
Sulfurous
Sulfur
Sulfide
2. Which of the following elements does not form an ion with a charge of +1
A:Sodium
B:Fluoride
C;Potassium
D:Hydrogen
3. The chemical properties of an element are largely determined by____
A:The number of valence electrons they have
B:The number of total protons the element has
C:The number of total ions the element has
D:The number of total electrons the element has
5. How does magnesium obey the octet rule when reacting to form compounds?
A. It gives up electrons
B. Magnesium does not obey the octet rule.
C. It gains electrons
D. It does not change its number of electrons
6. How many electrons does strontium have to give up to achieve a noble gas electron configuration?
0
1
2
3
Answer:
1 sulfide
2 Fluoride
3 A
5 A
6 2
What are the names, symbols, and atomic numbers of the nonmetal elements that are NOT gasses?
2. The ions in an ionic compound separate from each other when
A. dissolved in water
B. when melted
C. when conducting electricity
D. never
Answer:
A. when dissolved in water
Explanation:
Water is an extremely polar molecule, meaning it has a positive end a negative end. When an ionic compound is dissolved, the positive pole of water will be attracted to the negative ion and attach itself to it. The same goes for the positive ions. That's how water breaks down ionic compounds
Answer:
ions do separate in an ionic compound because there is the free flow of electrons in the oppositely charged ions and conducts electricity in an aqueous form
Substance
Formula
Mass,
(g)
Physical Color
State
Density Boiling
, (g/cm) Point,
Methane
сн.
16.0
Gas
Colorless
0.423
-161.5
Ammonia
NH,
17.0
Gas
Colorless
0.70
-33
Unknown
???
???
???
???
???
???
Propane
CH
44.1
Gas
Colorless
0.493
-12.1
Bromine
Br.
159.8
Liquid
Red
4.04
58.8
Lithium
Li
6.94
Solid
0.534
1342
Silvery,
white
metal
Magnesium Mg
24.3
Solid
1.74
1090
Silver,
white
metal
Answer:what are u asking to do?
Explanation:
How does the circulatory system work at the tissue level?
Answer:
Answer. Answer: The circulatory system is a network consisting of blood, blood vessels, and the heart. This network supplies tissues in the body with oxygen and other nutrients, transports hormones, and removes unnecessary waste products.
Explanation:
Answer:
ME AND YOU HAVE THE SAMEEEE USER BUT LOOK
The circulatory system is a network consisting of blood, blood vessels, and the heart. This network supplies tissues in the body with oxygen and other nutrients, transports hormones, and removes unnecessary waste products.
Explanation:
How many moles are there in 3.612 x 1024 formula units of Na2SO4?
Answer:
Theanswer is 6 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.612 \times {10}^{24} }{6.02 \times {10}^{23} } \\ [/tex]
We have the final answer as
6 molesHope this helps you
which of the following is the name given to the pairs of valence electrons that do not participate in bonding in diatomic oxygen molecule? A. unvalenced pair B. outer pair C. inner pair D. unshared pair
The name given to the pairs of valence electrons that do not participate in bonding in diatomic oxygen molecule is called Unshared pair
Unshared pair of electrons are also called Free radicals, lone pair or non bonding pairs, they refer to electrons that do not take part in covalent bonding of molecules.
Unshared pair together with shared pair occupy the valence electron shell and make up the valence electrons.
Diatomic oxygen molecule has 4 pair of unshared electrons
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Describe a gentle force?
Answer:
The word gentle traces back to the Latin word gentlis, meaning “of the same clan,” and at first the world was used to describe people belonging to distinguished families, who were seen as courteous and noble. Nowadays you’re more likely to hear the word used to refer to things that are calm, moderate, and without harshness. The word is often applied to people, but it can be used more broadly to describe anything that is mild, such as "a gentle detergent" or "a gentle reminder."
what do you conclude from the bar graph
Answer:
A bar graph shows the relationship between different values of data. Each data value is represented by a column in the graph.