Correct the following statements
a.an element is a combination of two or more compounds
b. When a small amount of sugar is completely dissolved in water, a heterogeneous solution is formed
Answer:
a. Any substance that contains only one kind of an atom is known as an element. Because atoms cannot be created or destroyed in a chemical reaction
b. Sugarsolution is a homogeneous mixture because any substance dissolved in water becomes a homogeneous mixture
The sequence of bases in a DNA template strand is 5'AAAACTGTGCAT3'. What is the corresponding mRNA produced? Label the 3' and 5' end in your answer Enter the mRNA sequence with labels for the 3' and 5' ends.
The corresponding mRNA to 5'AAAACTGTGCAT3' is
3'UUUUGACACGUA5'.
What is nucleotide sequence?Nucleotides are the bases that are arranged in a specific way, and it joins the two strands of DNA and RNA.
In DNA, four nucleotide bases are present AT and GC. They are attached to each other.
In RNA, the same bases are present but instead of T, U uracil is present.
When reading the DNA, the RNA bases complimentary join with the bases of DNA.
Thus, the corresponding mRNA sequence is 3'UUUUGACACGUA5.
Learn more about base sequence
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What is a measure of the amount of a substance dissolved in a solvent?
Answer:
Concentration is a measure of how much solute (or dissolved "stuff") is present per amount of solvent (or dissolving liquid) in a solution. The most common measurement of concentration is molarity, abbreviated M. Molarity is expressed in amount per volume, or moles/liter.
Explanation:
A scientist observes rock masses that have moved past each other in opposite horizontal directions. Which feature does the scientist observe?
Answer: strike-slip fault
Explanation:
Answer:
C; strike split
Explanation:
How many atoms are present in a sample of Calcium (Ca) weighing 127.38g?
Answer:
1.9139 × 10²⁴ atoms Ca
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
127.38 g Ca
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Ca - 40.08 g/mol
Step 3: Convert
[tex]127.38 \ g \ Ca(\frac{1 \ mol \ Ca}{40.08 \ g \ Ca} )(\frac{6.022 \cdot 10^{23} atoms \ Ca}{1 \ mol \ Ca} )[/tex] = 1.91388 × 10²⁴ atoms Ca
Step 4: Check
We are given 5 sig figs. Follow sig fig rules and round.
1.91388 × 10²⁴ atoms Ca ≈ 1.9139 × 10²⁴ atoms Ca
Which of the following correctly describes the electrical charges of subatomic particles?
B Protons/positive; neutrons/negative; electrons/negative
C Protons/neutral; neutrons/positive ; electrons/negative
D Protons/negative; neutrons/neutral; electrons/negative
Answer:
D Protons/negative; neutrons/neutral; electrons/negative
Explanation:
There are three fundamental subatomic particles found in atom which are the protons, neutrons and electrons.
Protons are the positively charged particlesNeutrons are neutral and do not carry any chargesElectrons are negatively charged.In the tiny central nucleus, both protons and neutrons can be found
The electrons occupy the bulk volume of the atom.
8. Chuck wants to investigate how gas molecules move in a container. Which model would be helpful to represent this motion?
A.) stacking blocks to build a tower
B.) freezing water in a ice cube tray
C.) bouncing elastic balls off of each other and the walls of a room
D.) placing a closed, water-filled plastic bag in the sun and watching condensation form
Answer:
nuts in yo mouth
Explanation:
Answer:
I'm not 100% sure but it's not A or B. It's probably cc
Explanation:
Predict how many electrons will Li (lithium) most likely be gained or lost
Answer:
Lithium will lose about 2 electrons
Making it a cation
Answer:
about three
Explanation:
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Which pair of elements can form ionic bonds?
A.
copper (Cu) and nitrogen (N)
B.
gallium (Ga) and phosphorus (P)
C.
hydrogen (H) and sulfur (S)
D.
phosphorus (P) and fluorine (F)
E.
potassium (K) and bromine (Br)
Answer:
E. potassium (K) and bromine (Br)
Explanation:
An ionic bond is formed between compounds with a large electronegativity difference between them. It is usually between a metal and non-metal.
Potassium is a true metal found in group 1 on the periodic table. Bromine is a highly electronegative non-metal which is a halogen. Potassium will lose one of its electrons which will be gained by the Bromine. The electrostatic attraction between the two species will cause the ionic bond to form. The ability of one specie willing to lose electron and the other gaining, is the main bed rock of ionic bonding.Answer:
Correct answer: E. potassium (K) and bromine (Br)
Explanation:
(Correct answer for (portal and Edmentum users too)
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What would happen if a researcher failed to realize a thermometer he or she was using has a Celsius and Fahrenheit scale?
Answer:
To obtain a more accurate read on temperature, the researcher should make sure to measure temperature by Celsius degrees rather than Fahrenheit.
Explanation:
Temperature is a measure of heat intensity. In food science experiments, you should always require an exact description of heat intensity. The most commonly used unit of temperature in the laboratory is the Celsius degree because the Celsius temperature scale is based on the boiling and freezing points of pure water. The difference between the points of boiling and freezing temperatures (at 1 atmosphere of air pressure) is divided into 100 equal units, making a Celsius degree 0.01 of the difference between the boiling and freezing points of water, making it the most accurate method of exact temperature reading. It is important to use the Celsius scale if you have a thermometer that reads Celsius and Fahrenheit.
List 4 important uses of Quartz
Answer:
Transparent Rock Crystal has many electronic uses; it is used as oscillators in radios, watches, and pressure gauges, and in the study of optics. Quartz is also used as an abrasive for sandblasting, grinding glass, and cutting soft stones.
Explanation:
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ASAP!!!
Answer:
rank from lower to higher electronegativity
16)Li
C
N
17)Ne
C
O
18)Si
P
O
19)K
Mg
P
20)He
S
F
7. Compare and contrast a dilute solution of a strong acid
and a concentrated solution of a weak acid.
Explanation:
An acid is a substance that ionizes to produce excess hydrogen ion in solutions.
A concentrated acid contains a high amount of hydrogen ions in solution compared to other ions. Such solutions usually ionizes completely. A dilute solution contains a high proportion of water and with low amount of hydrogen ions. They do not ionize easily and as fast as strong acids.A very hot cube of copper metal (32.5 g) is submerged into 105.3 g of water at 15.4 0C and it reach a thermal equilibrium of 17.3 0 Calculate the initial temperature of copper (Cs = 0.385 J/g 0C for copper, and 4.18 J/g 0C for water).
Answer:
The initial temperature of the metal is 84.149 °C.
Explanation:
The heat lost by the metal will be equivalent to the heat gain by the water.
- (msΔT)metal = (msΔT)water
-32.5 grams × 0.365 J/g°C × ΔT = 105.3 grams × 4.18 J/g °C × (17.3 -15.4)°C
-ΔT = 836.29/12.51 °C
-ΔT = 66.89 °C
-(T final - T initial) = 66.89 °C
T initial = 66.89 °C + T final
T initial = 66.89 °C + 17.3 °C
T initial = 84.149 °C.
Which statement best describes what the volume of an object represents
Answer:
Volume is the amount of space taken up an object.
K20
Molar Mass (g/mole)
2(39.10) + 16.00 = 94.20 g/mole
Moles
5.85 moles
Mass (grams)
Particles
Answer:
yes
Explanation:
that is the answer
Among the following, which is NOT an ionic compound?
Ca3N2
N204
AICI:
NaCl
Answer:
NaCl
Explanation:
HCI is a poiar covalent compound while ℂI4 is a non-polar covalent compound because both are iormed by sharing of electrons. KCl and NaCl are formed by the transfer of electrons and are ionic compounds.
if you had a piece of chalk that has a mass of 5 grams, what would you predict about its density?
Answer:
It would be about 1 g/mL.
Explanation:
With the information provided the volume of the chalk can be said to be about 5mL.
Hence;
Its density = 5g/5mL = 1g/mL.
Beth has two unlabeled balloons, one filled with hydrogen gas and the second filled with neon gas. She researches and writes down the density of hydrogen and neon. Beth also has several chambers filled with various gases and a poster showing the densities of these gases. She has no other materials or tools available to her to help her identify the element in each balloon. The poster and Beth’s data are shown. Select the gas from the poster that Beth should use in an experiment to identify the element in each balloon. Explain your answer.
Answer:
Aargon is NOT the answer.
Explanation:
Identify a metalloid from the following
(1) Antimony
(2) Sodium
(3) Aluminium
(4) Helium
Antimony
Hope it helps
Answer:
[tex]\boxed {\boxed {\sf 1. \ Antimony}}[/tex]
Explanation:
A metalloid is an element that is "in between" a metal and non-metal. They display some properties of both.
On the Periodic Table, the metalloids are found in a zig-zag step pattern to the right of the metals and the left of the non-metals.
There are 7 metalloids: boron, silicon, germanium, arsenic, antimony, tellurium, and polonium.
So, the correct answer is 1. Antimony
Explain how a substances flammability can indicate a chemical change.
Answer:
This is simple, if it has a high flammability, and you light it on fire, then that would be a chemical change.
Explanation:
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When an element in the first group of the periodic table
reacts with an element in the seventh group, what is the
type q bond that is likely to be formed?
Answer:
An ionic bond
Explanation:
They are most likely going to form an ionic bond.
An ionic bond is where atoms lose/gain electrons.
It is easier for elements in the first group to lose the one electron on their valence shell and for elements in the second group to take that.
Some examples are Sodium Chloride (NaCl) and Potassium Chloride (KCl)
Consider the reaction: 3 N2 (g) + 2 O3 (g) → 6 NO (g) ΔfH ° (kJ/mol) 0.00 142.26 90.37 Sm ° (J mol-1 K-1) 191.5 237.7 210.6 What is ΔrG ° for this reaction in kJ/mol at 350 K?
Answer:
Explanation:
3 N₂ (g) + 2 O₃ (g) → 6 NO (g)
Δ H(rxn ) = 90.37x 6 - ( 0 + 142.26 x 2 )
= 542.22 - 284.52
= 257.7 kJ
Δ S(rxn ) = 6 x 210.6 - ( 2 x 237.7 + 3 x 191.5 )
= 1263.6 - ( 475.4 + 574.5 )
= 213.7 J / K
Δ G = Δ H - T Δ S
= 257.7 - 350 x 213.7
= - 74537.3 kJ .
Δ G / mole = - 74537.3 / 6 = - 12422.88 kJ / mol.
3. Sulfur
a) Orbital Notation:
OO 0000
DOC
b) Electron Configuration:
4. Iron (Fe)
a) Orbital Notation:
O O OOO OO OO ОО
b) Electron Configuration:
Explanation:
We are to write the orbital notation and electronic configuration of sulfur and iron.
The orbital notation shows the filling of electrons into orbitals or sublevels.
Electron configuration shows the distribution of electrons into shells;
Number of electrons Electron configuration Orbital notation
S 16 2 8 6 1s² 2s² 2p⁶ 3s² 3p⁴
Fe 26 2, 8, 14 2 1s² 2s² 2p⁶ 3s² 3p⁶3d⁶4s²
tell me about yourself
Answer:
Tell picture above is a sample of tell me about yourself
Fill in the blanks with the correct words.
The movement of molecules from an area of low concentration to an area of high concentration occurs in help plz in being timed I’ll mark u Brainlyest
transport.
transport, molecules move from an area of high concentration to an area of low concentration.
In
Intro
Done
Answer:
i had this same question and the answer is electron.
Explanation:
what is the name of this atom?
A.) Beryllium
B.) Boron
C.) Fluorine
D.) Helium
Answer:
Explanation:
A .
I dont get this, please help
Answer:
The answer is B
Explanation:
Inertia: a tendency to do nothing or to remain unchanged.
Is nitrogen reactive or stable?
A reactive
B stable
Nitrogen is reactive I think
How much heat energy is needed to raise the temperature of 135 g of water (specific heat of water = 4.19 J/g-C) from 15 degrees Celsius to 27 degrees Celsius?
Answer:
Required heat = 6,787.8 j (Approx)
Explanation:
Given:
Mass of water = 135 g = 0.135 g
Specific heat of water = 4.19 J/g-C
Change in temperature = 27 - 15 = 12 degrees Celsius
Find:
Required heat
Computation:
Required heat = mcΔt
Required heat = (135)(4.19)(12)
Required heat = 6,787.8 j (Approx)