Look at the information on the element box below to answer the following questions.
30
Zinc
65.39
1. Atomic Number =
2. Atomic Mass =
3. Number of Protons -
4. Number of Neutrons =
5. Number of Electrons
1. Atomic Number = 30
2. Atomic Mass = 65.39
3. Number of Protons = 30
4. Number of Neutrons = The atomic mass (65.39) minus the atomic number (30) gives us 35.39, so there are approximately 35 neutrons.
5. Number of Electrons = In a neutral atom, the number of electrons is equal to the number of protons, so there are 30 electrons.
Element
Argon
Chlorine
Helium
Nitrogen
Zinc
Symbol
Ar
CI
He
N
Zn
Based on its location on the partial periodic table shown above, which element would you predict has chemical properties that are most similar to argon (Ar)?
A Chlorine (CI)
(в Helium (He)
(c Nitrogen (N)
(D) Zinc (Zn)
Based on its location on the periodic table, the element that would predictably have chemical properties most similar to argon (Ar) is Helium (He).
Elements found to the right of the zig-zag line are classified as
(A) Metals
(B Transition Metals
(c) Metalloids
B) Nonetals
(c) Metalloids
Is this right?
My apologies for the incorrect response. The correct answer is (B) Nonmetals. Elements found to the right of the zig-zag line on the periodic table are typically classified as nonmetals.
A class observes two demonstrations: water changing into steam and a piece of wood burning and producing smoke. A student concludes that both demonstrations must be examples of a chemical change because a gas is produced in each.
Is the student's conclusion accurate? Explain your answer, referring to both demonstrations.
The student's conclusion is accurate. Both demonstrations are examples of a chemical change because they involve a chemical reaction that results in the formation of a gas.
In the first demonstration, the water changing into steam involves the process of evaporation. This is a phase change, but it is also a chemical change because the water molecules are breaking apart and forming water vapor molecules. As a result, a gas (water vapor) is produced.
In the second demonstration, the wood burning and producing smoke is a combustion reaction. This is a chemical change because the wood molecules are reacting with oxygen in the air to produce carbon dioxide, water vapor, and other combustion products. The smoke that is observed is a mixture of particles and gases produced during the burning process, including carbon dioxide and other gases.
In both cases, a gas is produced as a result of a chemical reaction, indicating that a chemical change has occurred. Therefore, the student's conclusion is accurate.
DRAG & DROP THE ANSWER
electron
neutron
proton
Note: Use CTRL+D to drag the option via keyboard
neutron
proton
electron
Look at the changes taking place and then correctly complete the table by checking off whether the change is chemical or physical.
Changes Taking Place Chemical Change Physical Change
Iron rusting
Water boiling
Sugar dissolving
Eggs cooking
Changes Taking Place Chemical Change Physical Change
Iron rusting ✓
Water boiling ✓
Sugar dissolving ✓
Eggs cooking ✓
Look at the changes taking place and then correctly define if the change is chemical or physical.
Changes Taking Place Chemical Change Physical Change
Iron rusting
Water boiling
Sugar dissolving
Eggs cooking
Changes Taking Place Chemical Change Physical Change
Iron rusting Chemical Change
Water boiling Physical Change
Sugar dissolving Physical Change
Eggs cooking Chemical Change
Select all of the following events in which a chemical change occurs.
Toast is lightly charred in a toaster.
A piece of paper is cut up into 12 pieces.
c Chocolate syrup dissolves into warm milk.
Sugar is heated until it turns into a brown caramel sauce.
E Two unknown liquids are mixed together and a gas is produced.
A sugar cube dissolves in coffee.
Toast is lightly charred in a toaster. (Chemical Change)
A piece of paper is cut up into 12 pieces. (Physical Change)
Chocolate syrup dissolves into warm milk. (Physical Change)
Sugar is heated until it turns into a brown caramel sauce. (Chemical Change)
Two unknown liquids are mixed together and a gas is produced. (Chemical Change)
A sugar cube dissolves in coffee. (Physical Change)
Match the particle with their charge.
Protons
Neutrons
Electrons
DRAG & DROP THE ANSWER
-1
+1
0
Protons: +1
Neutrons: 0
Electrons: -1
A chemical change occurs when..
the identity of a substance changes but its appearance does not.
the appearance of a substance changes but its identity does not.
neither the appearance of a substance nor its identity changes.
both the physical properties of a substance and its identity change.
A chemical change occurs when the identity of a substance changes but its appearance does not.
Is this correct?
Apologies for the confusion in my previous response. Here is the correct answer:
A chemical change occurs when the identity of a substance changes but its appearance does not.
Use the periodic table below to determine the number of protons in Nickel (Ni).
GROUP
PERIODIC TABLE OF THE ELEMENTS
RELATIVE ATOMIC MASS /11
Semimetal
L Nonmetal
GROUP CAS
VINA
A MODA
He
4 9 0127
Alkaline earth mela
0 12.011
Be
10.81
B
Transition metals
10 20.180
Noble gas
DAVISOR
La Lanthanide
C
0
Ne
STANDARD STATE (25 °C; 101 kPa
Adlinide
11 22.990 12 24.305
Ne - gas
Fa - solid
Hg - liquid
Te - synthetic
13 26.982 14 28.085 15 30.974 16 3206 17 3545 18 39 948
Na
Mg
FERMENT NAME
MANESIUM3
VB 6
Si
P
VIlIB
VIE 7
VIlE
S
CI
Ar
19 39.098 20 40.078 21 44.956 22 47.867 23 50.942 24 51.996 25 54.938 26 55.845 27 58.933 28 58.693
29 63.546 30 65.38 31 69.723 32 72.64 33 74.922 34 78.97
Ca
Sc
Ti
V
Cr
Mn
Fe
Co
Ni
Cu
Zn
Ga
CAL CHRI
Ge
As
Se
Br
Kr
37 RS 468 38 87 62 39 RB O06 40 01 934 41 02 006
47 95 95 43
(98) 44 10107 45 10291 46 408 49
47 107.87 48 112.41 49 114.82 50 118.71 51 121.76 52 127.60 53 126.90 54 131 29
Rb
Sr
Y
Zr
Nb
Mo
Ru
Rh
Pd
ANATOUENUM TECHNETIUM RUTHENIUM
Ag
Cd
In
Sn
Sb
Te
Xe
SILVER
55 132 91
56 137 33]
57.71 2 17849 73 180 95
74 183.84 75 186.21 76 190.23 77 192.22 78 195.08 79 196.97 80 200.59
6
ESTONA RE
82 207.2 83 208 98 84 (209)
Cs
Ba
Hf
Ta
W
Re
Os
Ir
Pt
Au
Hg
TI
Ph
Bi
Po
At
Rn
GOLD
104 (267) 105 (268) 106 (271) 107 (272) 108 (277) 109 (276 110 (281) 111 (280) 112 (285) 113 (285) 114 (287) 115 (289
Fr
Ra
Ac-Lr
RI
Db
§g
116 (291)17 (294) 118 1204
Bh
Mit
Ds
Rg
Ст
Diromen
Nh
Me
Ly
Tis
Og
LANTHANIDE
57 138.91 58 140.12 59 140.91 60 144.24 61 (145) 62 150.36 63 151.96 64 157.25 65 158.93 66 162.50
La
Ce
Pr
Nd
Pm
Sm
Eu
Th
Dy
NEODYMINT
67 164.93 68 167.26 69 88.970 о
Ho
Er
Tm
Yb
Lu
ACTINIDE
Ac
90 232.04 91 231.04 92 238.03 93 (237) 94 (244) 95 (243) 96 (247) 97 (247) 98 (251) 99
Th
Pa
U
Np
Pa
Ст.
Bl
) 100 (257) 101 (258) 102 (259) | 103 (282
MId
No
ILo
(A) 28
(B) 31
(c) 58 69
Based on the periodic table, we can find the number of protons in Nickel (Ni) by locating its atomic number.
The atomic number of an element corresponds to the number of protons it has in its nucleus. For Nickel (Ni), the atomic number is 28. Therefore, Nickel has 28 protons.
For a chemical reaction in a closed system, mass cannot be the reaction mass is
created; destroyed; lost
(B rearranged; destroyed; gained
(C ) created; destroyed; conserved
(D) rearranged; created; conserved
The correct answer is (C) created; destroyed; conserved. In a chemical reaction in a closed system, mass is conserved. This means that no mass is created or destroyed during the reaction. The total mass of the reactants is equal to the total mass of the products. Only rearrangement of atoms or molecules occurs in a chemical reaction.
Which of the following represent the law of conservation of mass?
A) 3 black circles + white circle -> 2 black circles and a white circle
B) 3 white circles + 2 black circles -> 3 black circles and 1 white circle
C) 2 black circles surrounding a white circle + white circle -> 2 black circles surrounding a white circle 2 black circles surrounding a white circle
D) 4 black circles + 2 white circles-> 2 black circles surrounding a white circle 2 black circles surrounding a white circle
The correct answer is C) 2 black circles surrounding a white circle + white circle -> 2 black circles surrounding a white circle + 2 black circles surrounding a white circle.
This option represents the law of conservation of mass because the number of black circles and white circles remains the same before and after the reaction. The total mass of the black circles and white circles is conserved.
The balanced chemical equation below shows the decomposition of water into hydrogen and oxygen.
2H20 -> 02 + 2H2
Answer the questions below:
1. How many total atoms are in the reactants?
2. How many hydrogens are in the products?
3. How many oxygens are in the reactants?
4. How many total atoms are in the products?
1. How many total atoms are in the reactants?
In the reactant, there are 2 water molecules (H2O). Each water molecule consists of 2 hydrogen atoms and 1 oxygen atom. Therefore, the total number of atoms in the reactants is 2 water molecules × (2 hydrogen atoms + 1 oxygen atom) = 2 × (2 + 1) = 6 atoms.
2. How many hydrogens are in the products?
In the products, there are 2 molecules of hydrogen gas (H2). Each hydrogen gas molecule consists of 2 hydrogen atoms. Therefore, the total number of hydrogens in the products is 2 molecules × 2 hydrogen atoms = 4 hydrogens.
3. How many oxygens are in the reactants?
In the reactants, there are 2 water molecules (H2O). Each water molecule consists of 1 oxygen atom. Therefore, the total number of oxygens in the reactants is 2 water molecules × 1 oxygen atom = 2 oxygens.
4. How many total atoms are in the products?
In the products, there is 1 molecule of oxygen gas (O2) and 2 molecules of hydrogen gas (H2). The oxygen gas molecule consists of 2 oxygen atoms, and each hydrogen gas molecule consists of 2 hydrogen atoms. Therefore, the total number of atoms in the products is 1 oxygen molecule × 2 atoms + 2 hydrogen molecules × 2 atoms = 2 + 4 = 6 atoms.