Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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question 9 1 pts what chemical is the main component of natural gas? (w…
Methane
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what is another name for sodium hydroxide? (there are multiple answers …
Caustic soda
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2. a student added 10 ml of sodium chloride, nacl, to 100 ml of water a…
Sodium chloride is the solute, water is the solvent, and salt - water is the solution.
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1. a student dissolves sodium chloride, nacl, in distilled water. which…
solvent
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question 6 type the numerical value of zincs melting point (in degrees …
419.58
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type the numerical value of coppers melting point (in degrees celsius).…
1083
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what hazardous properties does sodium hydroxide have? (check all that a…
Corrosive. Can release dangerous amount of heat when dissolved in water. Can be fatal if ingested. Can cause blindness if it contacts your eyes.
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question 2 where is the hottest part of the bunsen burner flame? o with…
at the tip of the inner (bright blue) cone
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take quiz im not expecting you to know the answers - im not expecting y…
1. alloy 2. compound 3. element 4. mixture
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10. how many significant figures are in each of the following measureme…
10. a) 4 b) 6 c) 1 d) 3 11. a) 6.411 g b) 1.1 cm c) 2.79 m² d) 29.74 g/mL 12. $8.57\times10^{-8}$ m² 13. $2.22\times10^{-3}$ cm³ 14. c. volume 15. d. meter and kilogram 16. d. mm,…
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after sample a0106 was retrieved from the asteroid ryugu, a portion of …
A. the third extract in the sequence contains dimethyl sulfides and the fourth contains alkanes
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a new drug to combat acne has been developed from a compound that is fo…
D. biologists, chemists, and physicians
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dalton was an english schoolteacher, rutherford was a chemist from new …
the cumulative nature of science
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which of the models is an example of a solution?
The first model (the beaker with red liquid)
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what is the entire mixture of a lemonade drink called? a solution a sol…
a solution
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what is the sugar in lemonade? a solution a solvent a solute
a solute
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when you mix sugar into a glass of lemon juice until it disappears, the…
lemon juice
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when you mix salt into a glass of water until it disappears, the salt s…
salt
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when the first periodic table of the elements was published, the elemen…
New information changed the understanding of the atom's structure.
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in a solution, what is a solvent? a substance in which the solute disso…
A substance in which the solute dissolves.
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in a solution, what is a solute? the substance that clumps in the solve…
The substance that dissolves.
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what is a solution? a mixture where two fluids separator from one anoth…
A mixture where one substance dissolves evenly into another.
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choose the correct answer. what type of mixture is trail mix? solution …
heterogeneous
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choose the correct answer. which of these is not a mixture? hydrogen an…
hydrogen and oxygen combined to make a molecule of water
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choose the correct answer. which of the following shows an example of a…
The first image (the one with colorful objects)
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which of the following is a heterogenous mixture? ice cream sundae air …
ice cream sundae
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which of the following is an example of a homogeneous mixture? rocky ro…
tea
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choose the correct answer. is this ice cream sundae a homogeneous or he…
heterogeneous
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choose the correct answer. is this cookie a homogeneous or heterogeneou…
heterogeneous
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choose the correct answer. is air a homogeneous or heterogeneous mixtur…
homogeneous
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choose the correct answer is this mixture of stones homogeneous or hete…
heterogeneous
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the birdseed in this image is a mixture of several different types and …
heterogeneous
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when a mixture is created, are new molecules formed? yes no
no
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choose the correct answer. what is a mixture? when a chemical reaction …
two or more substances combined
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new and interesting research conducted by suleiman a. al - sweedan and …
B. sporadic
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an irregularly shaped stone was lowered into a graduated cylinder holdi…
g/mL
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choose the correct answer. which household chore is a physical change? …
Folding laundry
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what are physical changes of matter? changes that make new molecules ch…
changes that do not make new substances
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choose the correct answer. which is a physical change? baking brownies …
Folding paper
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how can you tell if a physical change has occurred? the composition of …
The composition of the substance has not changed.
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choose the correct answer. which of these is not a physical change? bre…
burning a candle
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choose the correct answer. why is ice melting considered to be a physic…
the water molecules do not change chemically and are still H2O
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choose the correct answer which of these is a physical change? rust is …
an object is cut into pieces
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choose the correct answer. which of these is a physical change? somethi…
water freezes
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choose the correct answer. why is cutting a piece of paper considered a…
even though the paper is in smaller pieces, each piece is still paper
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choose the correct answer. which of these are physical changes? cutting…
cutting, tearing, freezing, thawing, folding, mixing without chemical changes
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7. which of the following physical characteristics is the same for a pa…
7. d. Melting point 8. a. Density 9. d. Stir the pile into a bowl of water, and then pour the water out of the bowl.
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social studies 7- async: section 1-7(lms) quiz: the distant past (lms g…
B. the things that people in the past left behind
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4. the table below shows a scientist has a sample of metal that could b…
4. b. Density 5. d. Salts 6. b. Ball B
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4. the table below shows some of the properties of two metals. a scient…
8. d 9. b
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2. what shape does a water molecule have? draw what you think a water m…
A water molecule has a bent (V - shaped) geometry. The drawing would show an oxygen atom in the center with two hydrogen atoms bonded to it at an angle and two lone pairs of elect…
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what class of elements do the highlighted elements below belong to? a. …
B. Metals
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1. what is polarity? what about a water molecule makes it a polar molec…
Polarity is the separation of electric charge in a molecule creating a dipole moment. In a water molecule, oxygen's high electronegativity and the bent molecular geometry make it …
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what name is given to the following elements shown in group 1? a. alkal…
A. Alkali metals
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level 5 what is not a characteristic of the alkaline earth metals? a. s…
D. None of the above
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level 4 what is not a characteristic of the noble gases? a. they have c…
A. They have colored vapors
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level 2 what does the number \15.999\ represent in this symbol? a. numb…
D. Atomic mass
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what does the number \6\ represent in this symbol? a. number of electro…
C. Atomic number
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level 1 q3 what are the horizontal rows of the periodic table called? a…
C. Periods
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level 3 what family in the periodic table does neon belong to? a. alkal…
C. Noble gases
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level 1 what are the vertical columns of the periodic table called? a. …
D. Groups
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18. eating too much fat causes weight gain. mark only one oval. true fa…
18. True 19. True 20. False 21. True 22. True
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level 1 what scientist created the periodic table that we still use tod…
B. Dmitri Mendeleev
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level 5 what is not a characteristic of the halogen family? a. they are…
B. Good conductors of heat
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the newspaper headline below was published in the early 1900s. ferry fl…
Flagler's ability to construct the railroad increased Florida's ability to trade.
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24 mark for review administrators at a state university computed the me…
C. Yes. It could happen. Whether it does happen depends on the number of juniors and seniors in each major.
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what molecule is responsible for drunkenness? acetone hydrogen ethanol …
Ethanol
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use the periodic table to identify the number of core electrons and the…
10 core electrons 2 valence electrons
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use the periodic table to identify the number of core electrons and the…
core electrons: 18 valence electrons: 8
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use the periodic table to identify the number of core electrons and the…
core electrons: 18 valence electrons: 1
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choose the electron configuration for sodium (na) in both longhand nota…
Longhand notation: $1s^{2}2s^{2}2p^{6}3s^{1}$ Noble - gas notation: [Ne]$3s^{1}$
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choose the electron configuration for sodium (na) in both longhand nota…
1s²2s²2p⁶3s¹
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identify whether longhand notation or noble - gas notation was used in …
Potassium (K): longhand notation Argon (Ar): noble - gas notation Iron (Fe): noble - gas notation
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identify whether longhand notation or noble - gas notation was used in …
Potassium (K): longhand notation Iron (Fe): noble - gas notation
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identify whether longhand notation or noble - gas notation was used in …
longhand notation
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brazen bells! what a tale of terror, now, their turbulence tells! in th…
1. Alliteration 2. Onomatopoeia 3. No specific rhyme scheme
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part 2: classify each of the following as elements (e), compounds (c) o…
Diamond: E Sugar: C Milk: M Iron: E Air: M Sulfuric Acid: C Gasoline: M Electricity: X Krypton: E Bismuth: E Uranium: E Popcorn: M Water: C Alcohol: C Pail of Garbage: M A dog: X …
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use the periodic table in the tools bar to complete the electron - conf…
$H = 2$ $I = 2$ $J = 2$
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part 1: read the following information on elements, compounds and mixtu…
Diamonds (C): E Sugar ($C_{6}H_{12}O_{6}$): C Milk: M Iron (Fe): E Sulfuric Acid ($H_{2}SO_{4}$): C Gasoline: M Electricity: X Nitrogen (N): E Bismuth (Bi): E Uranium (U): E Popco…
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use the periodic table in the tools bar to complete the electron config…
C = 2 D = 2
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use the periodic table in the tools bar to complete the electron config…
A = 2 B = 1
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4. on page twenty - seven of edmond rostands cyrano de bergerac, cyrano…
Are you familiar with the work of Marie Curie? Born in Warsaw, Poland, on 7 November, 1867, Curie was a chemist and physicist. She and her husband, Pierre, won the Nobel Prize in …
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al + cuso₄ → al₂(so₄)₃ + cu
$2Al + 3CuSO_4 ightarrow 1Al_2(SO_4)_3+3Cu$
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al + cuso₄ → al₂(so₄)₃ + cu
$2Al + 3CuSO_4 ightarrow Al_2(SO_4)_3+3Cu$
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____ cu(no₃)₂ + ____ na₃po₄ → ____ cu₃(po₄)₂ + ____ nano₃
3, 2, 1, 6
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al + hcl → alcl₃ + h₂
2, 6, 2, 3
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hc₂h₃o₂ + ca(oh)₂ → ca(c₂h₃o₂)₂ + h₂o
2, 1, 1, 2
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\\_\\_\\_\\_ c₃h₈ + \\_\\_\\_\\_ o₂ \\_\\_\\_\\_ \\_\\_\\_\\_ fecl₃ + \…
For $\mathrm{C}_{3}\mathrm{H}_{8}+\mathrm{O}_{2} ightarrow$: 1, 5, $3\mathrm{CO}_{2}+4\mathrm{H}_{2}\mathrm{O}$ For $\mathrm{FeCl}_{3}+\mathrm{NaOH} ightarrow$: 1, 3, 1, 3
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c₃h₈ + o₂ → co₂ + h₂o
1, 5, 3, 4
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zn + hno₃ → zn(no₃)₂ + h₂
1, 2, 1, 1
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(_mathrm{zn}+ _mathrm{hno}_{3} ightarrow _mathrm{zn}(mathrm{no}_{3})_{2…
4
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caco₃ → cao + co₂
1, 1, 1
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reaction ____ k + ____ br₂ → ____ kbr
\(2K + 1Br_2 ightarrow2KBr\)
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4. on page twenty - seven of edmond rostands cyrano de bergerac, cyrano…
Are you familiar with the work of Marie Curie? Born in Warsaw, Poland, on 7 November, 1867, Curie was a chemist and physicist. She and her husband, Pierre, won the Nobel Prize in …
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lucy needs to buy some organic apples, and her grocery store is having …
A. $\{x|x\geq0\}$
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physical science - control test 6 nwseptember 2025 question 3 3.1 compo…
3.1.1: The simplest whole - number ratio of atoms of elements in a compound. 3.1.2: $P = 2$ 3.1.3: $C_4H_{10}$ 3.2.1: The reactant that is completely consumed in a chemical reacti…
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juliet: o romeo, romeo! wherefore art thou romeo? deny thy father, and …
hopefulness and longing.
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physical science/control test 7 nw/september 2022 question 4 consider t…
4.1 Activation energy is the minimum energy required for reacting particles to react. 4.2 Exothermic. Reason: $\Delta H=-7.28\ kJ/mol$ (negative value means heat is released). 4.3…
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physical science/control test 7 nw/september 2020 question 4 consider t…
4.1: Activation energy is the minimum energy required for reactant molecules to react. 4.2: Exothermic. Reason: $\Delta H=-7.28\ kJ\ mol^{-1}<0$, heat is released. 4.3: $19.32\ kJ…
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physical science/control test 5 nw/september 2025 question 2 in an expe…
2.1: One mole of a substance is the amount of that substance containing as many elementary entities as there are atoms in 12 g of carbon - 12. 2.2: $Na_2CO_3(s)+2HCl(aq) ightarrow…