化學
化學反應、化學計量、分子結構與元素性質。
-
read the passage and answer the following questions. everything around …
From left to right (or based on the diagram's labels, assuming the rightmost is electron, middle in nucleus is proton, left in nucleus is neutron): Rightmost (with - sign): electr…
-
10. which physical property of matter describes the relationship betwee…
a. density ### Question 11
-
a. a solution of two solids b. a mixture of particles with different de…
b. As the egg cooks, a new type of matter forms. ### Question 26
-
all isotopes of an element will have the same number of (select all tha…
B. Electrons, C. Protons
-
match the periodic table groups to the states of matter of its member e…
To solve this, we match each periodic group to the state of matter of its elements: 1. **Alkali Metals**: All solid but one (mercury is liquid, but alkali metals are all solid? Wa…
-
complete the table to summarize how the subatomic particles for isotope…
| | Protons | Electrons | Neutrons | |----------|---------|-----------|----------| | Iron - 54| 26 | 26 | 28 | | Iron - 56| 26 | 26 | 30 | | Iron - 57| 26 | 26 | 31 |
-
how is the \average atomic mass\ different from the \mass number\? sele…
A. Average atomic mass is listed on the periodic table. B. Average atomic mass takes into account the abundance of different isotopes D. Average atomic mass may have a decimal
-
matching match the correct description with the correct term. write the…
s: 13. b 14. j 15. e 16. b 17. h 18. c 19. d 20. a
-
which solution would be considered acidic? ph = 7 ph = 8 ph = 3 ph = 12
The correct option is the one with \( \text{pH} = 3 \) (the third option: \( \boldsymbol{\text{pH} = 3} \)).
-
lab safety scavenger hunt activity read the use for each safety tool, t…
To solve this lab safety scavenger hunt, we identify each tool based on its use: | Use | Name of tool | Location (example) | | --- | --- | --- | | 1. Protects clothing from spills…
-
the properties of matter multiple choice write the letter of the correc…
d. weight ### Question 2
-
multiple choice write the letter of the correct answer in the space pro…
d. weight ### Question 2
-
match the descriptions below to either metal or nonmetal.
- Good conductors of heat and electricity: metals - Found on the left side of the Periodic Table: metals - Solids are usually brittle: nonmetals - Malleable and lustrous: metals -…
-
what is the atomic number of the next element in the same period as pho…
16 (corresponding to the option with "16")
-
match the following scientists with their contribution to the atom stru…
- Dalton: Proposed atomic theory (atoms are indivisible, same element atoms are identical, combine in fixed ratios). - Democritus: Coined "atom", proposed matter is made of tiny, …
-
which scientist proposed that electrons travel in fixed paths in the at…
A. Niels Bohr
-
j. j. thomson observed that a cathode ray is diverted by electrically-c…
A. There are negatively charged particles in the atom.
-
who was the first person to come up with the idea of the atom? ○ jj tho…
D. Democritus
-
which option is an example of chemical energy being transformed into ki…
B. A rocket engine igniting its fuel during liftoff
-
what is the largest component of soil by percentage? organic matter the…
mineral matter
-
choose the correct answer. which of these describes physical weathering…
B. rocks being broken down by freezing and thawing (assuming the options are labeled A, B, C with A as "plants, lichens, and mosses breaking down rocks", B as "rocks being broken …
-
locating information in difficult graphics approximate colors of jewelr…
10% copper, 40% silver, and 50% gold
-
locating information in difficult graphics approximate colors of jewelr…
yellowish (the option corresponding to "yellowish" among the choices)
-
locating information in difficult graphics approximate colors of jewelr…
40 percent (the option: 40 percent)
-
key terms - chemistry - organic chemistry - inorganic chemistry - analy…
### Completion Exercise Answers: 1. **Composition** (Chemistry studies the composition of matter). 2. **Changes** (and the changes matter undergoes). 3. **Five** (traditionally di…
-
which of the following is an example of quantitative data? the color of…
C. The temperature in degrees Celsius
-
predicting the products of a decomp if mercury (ii) oxide is heated and…
Hg
-
which of the following is not a property of metals? poor conductors mal…
poor conductors
-
gold has high conductivity. what does this mean? it allows electrons to…
A. It allows electrons to flow easily.
-
most elements are metals. what is a physical property of metals? they a…
B. They conduct heat.
-
determine the number of significant figures in 10.0 grams
B. 3 (assuming the purple option is labeled B, if the options are labeled as A:4, B:3, C:5, D:2)
-
most substances that are not metals look dull. why? they are not ductil…
B. They lack luster.
-
copper is very ductile. what does this mean? it is very shiny. it can b…
B. It can be pulled into a wire easily.
-
how many significant figures does the following number have?1.2500 x 10³
5 (corresponding to the option with 5)
-
11/22 how many significant figures: 153.0 ml 3 2 4 1
4 (corresponding to the orange option with "4")
-
9/22 how many significant figures: 0.010 l 3 1 4 2
2 (The option with "2" is the correct one. If we consider the options as, for example, let's assume the options are labeled as: A. 3 B. 1 C. 4 D. 2 Then the answer is D. 2)
-
how many significant figures in the number below? 4.56 × 10³ 6 3 4 5
B. 3 (assuming the purple option with 3 is labeled as B, if we follow the order of options: first green 6, then purple 3, then orange 4, then cyan 5. So the correct option is the …
-
how many significant figures: 0.012 km
2 (corresponding to the option with value 2, e.g., if the options are labeled as A. 4, B. 1, C. 3, D. 2, then the answer is D. 2)
-
how many significant figures: 100.000 cl
6
-
how many sig figs are there? 0.0000008 7 2 1 6
1 (corresponding to the option with value 1, e.g., if the orange option is labeled with 1, then the answer is the orange option with text "1")
-
how many sig figs are there? 1000000000
B. 1 (assuming the purple option with "1" is option B, adjust identifier if needed)
-
analyze the pie chart, which shows the abundance of elements in earth’s…
C. gold, magnesium, iron, aluminum (assuming the third option is labeled C, but in the given options, the third option is "gold, magnesium, iron, aluminum")
-
multiple choice 4 points dr. johnson doesn’t want people to sit back, d…
A. problem and solution
-
the osmotic pressure exerted by a solution is equal to the molarity mul…
Your equation: $c=\frac{\Pi}{RT}$ Definitions of your symbols: - $\Pi$: osmotic pressure (17. atm) - $T$: absolute temperature (395. K) - $c$: molarity of the solution (For numeri…
-
the osmotic pressure exerted by a solution is equal to the molarity mul…
The equation to calculate the molarity $c$ is $c = \frac{\Pi}{RT}$, where $\Pi$ is the osmotic pressure (17 atm), $T$ is the absolute temperature (395 K), and $R$ is the gas const…
-
masteryconnect wilson, makyla dtal- ch- term 1 - unit 1 assessment - 25…
C. heat
-
masteryconnect dtal-ch- term 1 - unit 1 assessment - 25-26 a pure subst…
C. compound
-
masteryconnect data ch-term 1 - unit 1 assessment - 25-26. the law of c…
The first model (with 1 dark sphere + 2 light spheres as reactants, forming 1 dark - 2 light sphere product)
-
why does water bead up on a freshly waxed car? adhesion cohesion heat c…
cohesion
-
what is cohesion? another word for molecules when a substance dissolves…
D. attraction between the same molecules (assuming the last option is labeled D; if labels are A - D in order, the last option is D with text "attraction between the same molecule…
-
what is adhesion? the attraction between two different kinds of molecul…
A. the attraction between two different kinds of molecules
-
the substance that does the dissolving (ex:water) options: solution, so…
B. solvent (assuming the options are labeled as A. solution, B. solvent, C. solute, D. weathering; if labels differ, the correct option is the one with "solvent")
-
water is the universal solvent because it can dissolve many polar and c…
it can dissolve many polar and ionic compounds
-
what caused our sun to ignite and become a star? ○ fusion reactions wit…
C. Gravity
-
a student wants to test how water temperature affects the solubility of…
**Claim**: The solubility of oxygen gas in water decreases as the temperature of water increases. **Evidence**: From the graph, at 5°C, oxygen solubility in water is about 14 mg/L…
-
which piece of lab equipment would be best to measure 13.7 ml of liquid…
D. 25 mL graduated cylinder
-
classify the following descriptions as safe behavior in a science lab o…
To solve this, we analyze each statement based on lab safety principles: ### Safe Behavior in a Science Lab: - **Hands are thoroughly dried before touching an electrical outlet or…
-
a student hypothesizes that the solubility of a particular solute in wa…
C. Measuring the solubility of the solute at five different temperatures
-
the following results of a scientific study on water were found in a ch…
C. temperature (assuming the options are labeled as A. vapor pressure, B. molar mass, C. temperature, D. melting point)
-
question: when does a molecule become an ion? answer options: select on…
When it loses or gains an electron
-
challenge question!!! background knowledge: when any mass is pulled or …
$9.8 \, \text{m/s}^2$
-
the picture shows a filtration process. which of these is least likely …
Solid particles
-
question 5 (10 points) which pair best describes the physical process t…
c. Canadian Shield and glaciation
-
melting point results (°c) trial | group 1 | group 2 | group 3 | group …
Group 2
-
what is the density of an aqueous solution that has a mass of 10.081 g …
0.806
-
magnesium atom magnesium ion atomic number: mass number: protons: neutr…
To solve this, we analyze each element (Magnesium, Aluminum, Phosphorus, Sulfur, Chlorine) for atoms and ions: ### 1. Magnesium (Mg) - **Atomic number** (protons): \( 12 \) (Mg is…
-
question: when two atoms transfer electrons, the bond formed is called …
B. ionic
-
which option shows the following answer rounded to the correct number o…
\( 1.47 \times 10^{-2} \) (corresponding to the option "1.47 × 10⁻²")
-
question: waters unique properties of adhesion and cohesion are a resul…
C. hydrogen bond
-
question: which of the following are present in the nucleus of an atom?…
A. Protons and neutrons
-
the halogens are the elements of group 17 on the periodic table. haloge…
C. salt
-
exam lesson name: the nature of science, the chemistry of l ecology exa…
A. They don't react with other elements to form compounds.
-
round the following operation to the correct number of significant figu…
1.0 g/mL
-
transition metals can be found in families 3 through 12 on the periodic…
A. they are brightly colored and are often used to make pigments
-
the noble gases include helium, neon, argon, krypton, xenon, and radon.…
D. They are normally unreactive with other elements.
-
the periodic table is shown below. helium (he), neon (ne) and argon (ar…
C. xenon (Xe)
-
question 1 of 20 : select the best answer for the question. 1. in the n…
C. The atom determines the chemical property of an element.
-
wilson, makyla dtal- ch- term 1 - unit 1 assessment - 25-26 2 of 26 how…
The number of significant figures in \(0.02034\)g is 4, so the correct option is the one with 4 (assuming the option with 4 is one of the choices, like if the options are O 6, O 3…
-
question 1. select all statements that correctly explain why safety gla…
- Chemical spills, splashes, or reactions can occur unexpectedly, even from nearby experiments. - Flying debris or broken glass from accidents can cause eye injuries. - Wearing go…
-
which of these properties is the best one to use for identification of …
B. the number of protons in the atomic nucleus
-
which is a component of john daltons atomic theory? the ratio of atoms …
C. An atom is a small particle that cannot be broken down.
-
the mass number of a chromium atom is 52 and it has 24 protons. how man…
28
-
how are isotopes defined? forms of different elements that have the sam…
C. forms of the same element that differ in the number of neutrons in each atom
-
which shows the electron configuration for silicon (si)? ○ ar4s²3d¹⁰4p⁴…
D. $[\text{Ne}]3s^23p^2$ (assuming the last option is D, with the option text $[\text{Ne}]3s^23p^2$)
-
the symbol for xenon (xe) would be a part of the noble gas notation for…
B. cesium.
-
what is the electron configuration of chlorine (cl)? ○ $1s^2 2s^2 2p^6 …
B. \(1s^2 2s^2 2p^6 3s^2 3p^5\)
-
9) write 0.375 as an equivalent fraction (in simplest form). 10) solve …
$\frac{3}{8}$ ### Question 10
-
which characteristics of dickinsons style are evident in \the snow\? se…
- four - line stanzas - a varying rhythm - the use of personification
-
mixed practice 7) write four numbers that fall between 9.18 and 9.19. 8…
\( 9.181 \), \( 9.182 \), \( 9.183 \), \( 9.184 \) (answers may vary, any four numbers between \( 9.18 \) and \( 9.19 \) are correct) ### Question 8
-
name: teacher: date: chemistry: u1l5 mixture separation prepwork part 1…
To solve this mixture - separation matching problem, we analyze each mixture and the appropriate separation technique: ### 1. A muddy puddle A muddy puddle consists of solid mud p…
-
read the excerpt from \sonnet 29.\ when, in disgrace with fortune and m…
abab (the option corresponding to "abab")
-
q1 chemistry! utl6 mixture separation plan date: ______ prepwork prepwo…
A separation technique that could be used is chromatography (e.g., paper chromatography or thin - layer chromatography). Justification: Marker ink is a mixture of pigments. Chroma…
-
read the rough-draft paragraph. (1) many people experience a sense of t…
3
-
how many sigfigs are in the final answer for (2.5 + 8.6) x 10.0? explai…
The final answer has 3 significant figures.
-
q1 chemistry: u1l7 unit 1 review date: prepwork: u1 review 1. **carbon …
- **Solid Phase (Left Section)**: Draw $CO_2$ symbols (from key) in a tight, ordered grid. Label "Solid $CO_2$ (Dry Ice)". - **Liquid Phase (Middle Section)**: Draw $CO_2$ symbols…
-
5. **name two processes that can be used to separate two clear, miscibl…
Two processes to separate two clear, miscible liquids are **Simple Distillation** and **Fractional Distillation**. A scientist would choose Simple Distillation when the boiling po…
-
why is it important to write quantities with the correct number of sign…
To indicate how precisely a quantity is known.
-
name: __________________________ teacher: ____________ q1 chemistry: u1…
c. A mixture can be separated by physical means.
-
directions: calculate the following expressions with significant figure…
### 1. For \( 1.50 + 1.7 \) # Explanation: ## Step1: Identify operation and rule Operation: Sum (addition). For addition/subtraction, we go by decimal places. \( 1.50 \) has 2 dec…
-
significant figures exit slip name: jeremiah o per: directions: find th…
s: 1. For 17500 (assuming a typo and intended 1870.7): 5 (Rule: Zeros between non - zero digits and non - zero digits are significant) 2. 7.056: 4 (Rule: Zeros between non - zero …