The gaia hypothesis is an example of
The Gaia Hypothesis is an example of negative feedback.
Calculate the answer. Express it in scientific notation and make sure it has the correct number of significant figures. (2.45 x 1013) x (4.00 x 1012) = _____
(2.45 x 10^13) x (4.00 x 10^12) = 9.8 x 10^25
Hope this helps!
how many atoms of each element are needed to create an ionic compound of strontium selenide
PLEASE HELP! 94 POINTS AND BRAINLIST PLZ PLZ
04.04 Using the Periodic Table Assignment
You are an Intergalactic CSI that investigates crime scenes between galaxies!
There has been a nuclear explosion on another planet.
Your mission is to match the forensic evidence from the scene to our Earth’s Periodic Table.
Let’s make sure that you have all the atomic information that you will need!
Part 1: Mission Preparation: Use the following word bank to complete the sentences accurately.
atomic mass protons column electrons atomic number neutrons row 11 12 23
A. The _______________ ___________________ of an element includes atomic number plus the number of neutrons.
B. The atomic number represents the number of _____________________ and ___________________ in an element.
C. Elements found in the same_____________________ have similar chemical properties.
D. An element with an atomic number of 11 and an atomic mass of 23 will have __________ neutrons total.
Part 2: Mission Activated
Use information you have learned to help you match the Galactic Element Clues to our Earth elements found in the Periodic Table below.
When you find a match, please type the galactic symbols (letter abbreviation) in the periodic table below, next to Earth’s element symbol.
Periodic Table
Group 1 Group 2 Group 13 Group 14 Group 15 Group 16 Group 17 Group 18
1
H/Gs
1.008
2
He/
4.003
3
Li/
7.941 4
Be/
9.012 5
B/
10.811 6
C
12.010 7
N/At
14.006 8
O/
15.999 9
F/
18.998 10
Ne/
20.179
11
Na/So
22.989 12
Mg/
24.305 13
Al/Lm
26.981 14
Si/
28.085 15
P/
30.973 16
S/
32.065 17
Cl/Ms
35.453 18
Ar/
39.948
19
K/
39.098 20
Ca/
40.078 Skip
21 - 30 31
Ga/
69.723 32
Ge/
72.64 33
As/
74.921 34
Se/
78.96 35
Br/
79.904 36
Kr/
83.8
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, the blanks can be filled as below.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
A. The atomic mass of an element includes atomic number plus the number of neutrons.
B. The atomic number represents the number of protons and electrons in an element.
C. Elements found in the same column have similar chemical properties.
D. An element with an atomic number of 11 and an atomic mass of 23 will have 12 neutrons total.
Therefore, the blanks can be filled as above.
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Acceleration involves a change in __________.
Jimmer is playing basketball. After 24 seconds, the shot clock goes off and he loses the ball. This happens every time he gets the ball because he refuses to pass or shoot. Which of the following statements is true?
Jimmer is on a fixed-interval schedule of reinforcement.
Jimmer is on a variable-interval schedule of reinforcement.
Jimmer is on a fixed-ratio schedule of reinforcement.
Jimmer is on a variable-ratio schedule of reinforcement.
Answer:
The answer is A- Jimmer is on a fixed-interval schedule of reinforcement.
Explanation:
Final answer:
Jimmer is on a fixed interval reinforcement schedule, as he loses the ball every 24 seconds, which is a predictable and set amount of time after he initially gets possession.
Explanation:
Jimmer, in the scenario provided, loses the ball after 24 seconds each time he gets the ball because he refuses to pass or shoot, thus triggering the shot clock.
Jimmer is on fixed interval reinforcement schedule.
This is because his behavior (holding onto the ball) is being 'rewarded' with the loss of the ball at a predictable and set amount of time after he first acquires it, which is every 24 seconds.
A fixed interval schedule of reinforcement is when reinforcement is received after a certain fixed period of time has passed, as opposed to variable interval schedules where the period of time varies, and the ratio schedules where reinforcement is based on the number of responses rather than the passage of time.
Zinc metal reacts with oxygen to form solid zinc(II) oxide, write a balance equation for this reaction
Zinc metal reacts with oxygen to form solid zinc(II) oxide, The balanced equation is 2Zn + O₂ → 2Zn₂⁺+ 2O₂⁻ .
What is zinc metal ?With the atomic number 30 and the symbol Zn, zinc is a chemical element. When the oxidation is removed, zinc transforms into a shiny-greyish metal that is slightly brittle at normal temperature. It is the first element in the periodic table's group 12 of elements.
A chemical combines with oxygen to form its oxide during combustion, which generates heat and light. Metals produced when metal oxides react with oxygen. Zinc oxide is created by the combustion of zinc, as illustrated below: 2Zn+O2→2ZnO.
This reaction is a combination reaction, which is the type of chemical reaction it is. Balanced Approaches: We have zinc and oxygen gas in this reaction of combination, and they mix to make zinc oxide.
Thus, zinc metal reacts with oxygen to form solid zinc(II) oxide, The balanced equation is 2Zn + O₂ → 2Zn₂⁺+ 2O₂⁻ .
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NaCl, I2, HCl, KF what kind of bond are they?
Final answer:
NaCl, I2, HCl, and KF have different types of bonds: NaCl and KF have ionic bonds, while I2 and HCl have covalent bonds.
Explanation:
The compounds NaCl, I2, HCl, and KF have different types of bonds.
NaCl, sodium chloride, has an ionic bond. In an ionic bond, one atom donates electrons to another atom to form ions with opposite charges.
I2, iodine, has a covalent bond. In a covalent bond, atoms share electrons to fill their valence shells.
HCl, hydrogen chloride, also has a covalent bond.
KF, potassium fluoride, has an ionic bond. The metal atom donates electrons to the non-metal atom.
What is the value for ΔS°reaction for the following reaction, given the standard entropy values
C6H12O6(s) + 6O2(g) —->6CO2(g) + 6H2O(l)
+131 j/k
-131 j/k
+262j/k
-262 j/k
+417j/k
How many double bonds are in an alkane?
Alkanes are hydrocarbons with only single bonds between the carbon atoms, therefore, they do not contain any double bonds.
Explanation:In chemistry, an alkane is a type of hydrocarbon where all of the carbon-carbon bonds are single bonds, meaning they share just one pair of electrons. Double bonds share two pairs of electrons and are typically found in alkenes, a different type of hydrocarbon. Therefore, an alkane does not have any double bonds.
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A bottle contains 6.23 g of copper turnings. The mass of a length of magnesium ribbon is 6.23 g. Are there more copper atoms or more magnesium atoms present?
A sample of gas at 301 Kelvin and 1.5 atmospheres has a density of 3.90 g/L. What is the molar mass of this gas? Show all of the work used to solve this problem.
Answer:
Molar mass of the gas is 64.3 g/mol
Explanation:
Given:
Temperature of gas, T = 301 K
Pressure of gas, P = 1.5 atm
Density of gas, D = 3.90 g/L
To determine:
The molar mass, M of the gas
Explanation
Based on the ideal gas equation
[tex]PV = nRT[/tex]
where P = pressure, V = volume ; R = gas constant, T = temperature
n = moles of the gas
[tex]n = \frac{mass(m)}{molar\ mass(M)}[/tex]
substituting for n in the ideal gas equation:
[tex]PV = \frac{m}{M} *RT\\\\M = (\frac{m}{V})*\frac{RT}{P} \\\\density , d = \frac{mass(m)}{Volume(V)} \\\\Therefore:\\\\M = d*\frac{RT}{P} = 3.90 g/L *\frac{.0821Latm/mol-K*301K}{1.5atm} =64.3 g/mol[/tex]
What is the concentration of a HF solution with a PH of 2.3
When determining the motion of the planets in the solar system what is a good reference point to use