化学
化学反応、化学量論、分子構造、元素の性質。
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nicoles chemistry textbook weighs 7/8 of a pound and her geometry textb…
$\frac{5}{8}$
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according to the presentation, which of the following allows producers …
B. Organic farming
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which of the following diagrams best depicts the structure of a typical…
C.
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question the nucleus of an atom can be split into smaller components by…
a physical process
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provide your answer below: element compound ammonia water manganese met…
Element: manganese, silicon, iron, copper Compound: ammonia, water, methane, silica
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elements are made of atoms that all have the same properties. how many …
There is no limit as to how many atoms an element can consist of.
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question carbon dioxide has a density of 2.0 $\frac{g}{l}$. what mass w…
7.0 g
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all polymers are made up of... monosaccharides monomers proteins none o…
B. monomers
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all organic compounds contain the element nitrogen sulfur carbon phosph…
carbon
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what happens during rusting of an iron nail? (1 point) iron and sulfur …
Iron and oxygen combine to form iron oxide.
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chemical reactions quick check how do catalysts affect a chemical react…
lower activation energy
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exercise 1.68 - enhanced - with feedback missed this? watch kcv_ units …
$4.49\ g/cm^{3}$
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24. name one situation where a dust mask (n - 95) is recommended. 25. w…
24. Working in a dusty area. 25. It's hazardous and pollutes water. 26. d. Warning of falling or moving object overhead 27. b. Someone carrying something behind you 28. e. Move aw…
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match each property of a liquid to what it indicates about the relative…
Strong intermolecular forces: high surface tension, high viscosity, high boiling point Weak intermolecular forces: high vapor pressure
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missed this? watch kcv: units and significant figures; read section 1.6…
$1.26$
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question 1: when caring for an amputated body part, what does the \tag …
Question 1: b) Labelling the body part's container with as much information as possible, including any information gathered during your secondary assessment Question 2: d) All of …
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missed this? watch kcv: units and significant figures; read section 1.6…
$0.00126g/cm^3$
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arrange the molecules by the strength of the london (dispersion) force …
Strongest London dispersion forces: $CH_3CH_2CH_2CH_2CH_2CH_2CH_3$ Second - strongest: $CH_3CH_2CH_2CH_2CH_3$ Weakest London dispersion forces: $CH_3C(CH_3)_2CH_3$
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missed this? watch kcv: units and significant figures; read section 1.6…
$7.39$
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arrange these compounds by their expected boiling point. highest boilin…
Highest boiling point: $CH_3OH$ Middle boiling point: $CH_3Cl$ Lowest boiling point: $CH_4$
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and does not react with vinegar, biuret solution, or iodine. of the fiv…
Sodium bicarbonate, Cornstarch
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provide your answer below: theory law statement matter consists of tiny…
Matter consists of tiny particles called atoms that combine in specific whole - number ratios to form substances with specific properties: Theory The force of attraction between t…
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question in the study of chemistry, you will learn about the ideal gas …
The ideal gas law explains how the properties of gases change.
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question which of the following are aspects of the study of chemistry? …
- the properties of matter - the interactions of matter - the composition of matter
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question chemistry is the study of: select the correct answer below: ma…
D. all of the above
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in geology, we study the atoms that make up stone and soil, which deter…
A. chemistry
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1. what is the chemical name for the atom? (hint: count the protons, th…
1. Oxygen 2. O 3. electrons: 8 protons: 8 neutrons: 8
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determine which of the following statements are related to chemistry. s…
When we cut onions, we cry.
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how are organic light emitting diodes (oleds), used in many modern disp…
OLEDs use new materials that were developed using chemistry.
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what part of an atom exists in orbitals surrounding the nucleus? a. pro…
D. electron
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question why is chemistry known as the \central science\? select the co…
Because it intersects with and provides a basis for a variety of other sciences.
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which is a nonpoint source of pollution? tourists throw trash into the …
Rain contains chemicals that seep into the ground.
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in a chemical reaction, which aspect of the reactants changes? (1 point…
arrangement of the atoms
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match the arrangement to the state of matter
Left - Solid, Middle - Gas, Right - Liquid
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amylose is a ... a linear starch a disaccharide a monosaccharide a bran…
A. A linear starch
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fill in the blank: the change from liquid to gas is called ____________…
C. Evaporation
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what is a physical change? a change in which the substance retains its …
A. A change in which the substance retains its original properties
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choose the correct answer. which type of energy is produced by vibratio…
sound energy
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what is a chemical change? change in the physical appearance of a subst…
A change that involves the formation of new substances with different properties.
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what makes up a compound? chemically - bonded atoms liquids containing …
chemically - bonded atoms
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temperature plays a role in both physical and chemical changes by influ…
particle energy and movement
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1. how many neutrons are in an atom of lithium? 3 li lithium 6.94 2. ho…
1. 4 2. 0 3. a. 12 b. Sodium (Na) 4. a. 10 b. Boron (B)
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what are some observations that indicate a chemical change? color, odor…
All of these options indicate a chemical change
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a chemical reaction occurred when 2 grams of baking soda were mixed wit…
Mass before: 4g Mass after: 4g
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which of the following is a change from solid to gas? a) melting c) con…
B. Sublimation
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which of the following is an example of a chemical change? melting ice …
C. Burning wood
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which of the following is an example of a physical change? c) rusting i…
B. Melting an ice cube
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choose the correct answer. the production of a new substance commonly i…
A. A chemical change
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classify each of these statements as always true at, sometimes true st,…
11. NT 12. AT
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choose the correct answer. which of the following is considered a physi…
cutting wood into pieces to build a doghouse
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choose the correct answer. which element shares similar properties with…
Strontium (Sr)
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choose the correct answer. what indicator is used to measure acidity? l…
litmus paper
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question 5 20 pts does this equation follow the law of conservation of …
no
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the products side of the chemical equation has a total of ______ atoms.…
7
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what happens to the chemical bonds in a chemical change? * o they break…
They break and new ones form, which forms a new substance
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question 3 20 pts how many different elements are found in the products…
5
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which process represents a chemical change? * boiling water cutting a p…
Frying an egg
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what is a key indicator that a chemical change has occurred? * a change…
B. A change in temperature, color, or a gas forming
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how many atoms of oxygen are on the reactants side of the chemical equa…
3
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which of the following is a physical change? * burning wood rusting iro…
C. Breaking glass
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2. write the formulas for the following compounds in the space provided…
b) $SiO_{2}$ d) $CS_{2}$ e) $NH_{3}$ f) $CCl_{4}$ g) $CH_{4}$ h) $O_{3}$ i) $F_{2}$ j) $P_{2}O_{3}$ k) $NO$ l) $P_{4}O_{10}$ m) $SiC$ n) $CH_{3}OH$ o) $P_{2}Br_{5}$ p) $AsBr_{3}$ …
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how many total atoms are on the reactants side of this chemical equatio…
42
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select the correct answer. a friend of yours asks for your help in eval…
E. a healthy diet that focuses on eating real whole foods and eliminating processed foods
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is the process of using no₃⁻ to make n₂ a reduction or an oxidation rea…
Reduction
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multiple choice 1 point most matter consists of... building blocks atom…
B. Atoms
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science law that states that when matter goes through a chemical or phy…
Law of Conservation of Matter
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multiple - choice question economics is classed as a traditional scienc…
False
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an organic compound has to have what?
Carbon
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what is one way people positively affect water resources? polluting fro…
D. limiting use of acid and other pollutants
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which statements about this area are true based on what you know about …
The area was once a forest. The area was uplifted. The area was probably covered by water.
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scientific law that states that whenever energy is converted from one f…
Second Law of Thermodynamics
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what do scientists use as a measure of acidity? the acid - base scale t…
D. pH Scale
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1. the specific heat capacity of copper is 3.900 j/g°c. the specific he…
$4186\ J$ (Note: The actual answer depends on the correct value of $\Delta T$. If $\Delta T$ is different, recalculate using the formula $Q = mc\Delta T$ with the appropriate $\De…
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2 multiple choice 1 point bleach has a ph of 11. it is...
Basic
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6. the specific heat capacity of copper is 3.900 j/g°c. the specific he…
4186J For the multiple - choice questions: 6.
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question 5 of 24 which of the following is an example of organic matter…
D. Sugar, which is made mostly of carbon, hydrogen, and oxygen
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4. the specific - heat capacity of copper is 0.39 j/g°c. the specific -…
$8368\ J$
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the periodic table helps us determine the number of electrons an atom h…
True
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question 3 of 24 which of the following contains chemical energy? a. he…
C. Plants
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fire is a? deformation of space evaporation process nice thing to look …
# Breve explicación: El fuego es un fenómeno químico causado por una reacción exotérmica entre combustible y oxígeno. # Respuesta: D. Chemical Reaction
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1. calorimetry is a. a type of reaction b. the study of measuring the a…
$4180J$
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by predicting the charge of an ion, chemists can understand how atoms w…
behave
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the ultimate goal of atoms gaining or losing electrons is to achieve a …
noble
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reconstructing a landscape which statements about this area are true ba…
The area was once a forest., The area was uplifted., The area was probably covered by water.
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1. heat is a. average kinetic energy b. total thermal energy c. thermal…
1. c. Thermal energy that is moving 2. c. Heat can transfer into an isolated system 3. a. $^{\circ}C=(^{\circ}F - 32)\times\frac{5}{9}$ 4. $0^{\circ}C$ 5. Need more information to…
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2.2.4 quiz: transfer of thermal energy question 8 of 10 an ice cube is …
B. The bonds between water molecules
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question 4 of 10 an ice cube is placed inside a thermos and the lid is …
D. Water vapor from the air
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chapter 3 and 4 test started: sep 4 at 1:52pm quiz instructions questio…
False
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chemistry: u1l5 mixture separation pre - work part 1: mixture separatio…
1. 1. A, C; 2. D; 3. C; 4. A; 5. B; 6. E 2. Evaporation is for getting solid from liquid when liquid is disposable. Distillation is for separating mixtures with different boiling …
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do now in chemistry, metallic bonding is a type of chemical bond that e…
1. electrons 2. delocalized 3. malleability 4. ductility 5. electricity; heat 6. transferred 7. shared 8. ions 9. non - metal 10. all
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question 1 granite and rhyolite are chemically the same but when they c…
True
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enter the symbol of a sodium ion, na⁺, followed by the formula of a sul…
$\text{Na}^+,\text{SO}_4^{2 - }$
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part c enter the expression $_{7}^{14}n+alpha$, where $alpha$ is the lo…
$^{14}_{7}\text{N}+^{4}_{2}\text{He}$
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check for understandings 1. metallic bonding involves a \sea of ______\…
1. electrons 2. delocalized 3. malleability 4. ductility 5. heat; electricity 6. transferred 7. shared 8. ions 9. non - metal 10. delocalized
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a car engine uses the combustion of fuel to move a system of gears that…
B. It is transformed into thermal energy, D. It is transformed into sound energy
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according to the law of conservation of energy, which statement must be…
A. Energy that is transformed is neither destroyed nor created
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question 8 of 10 what does the model below represent? 2co + o₂ → 2co₂ a…
C. A chemical reaction
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based on the model you saw in the study, predict what will happen to th…
B. The interactions between the molecules will become stronger.
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question 6 of 10 which two options are forms of potential energy? a. ch…
A. Chemical energy, E. Nuclear energy
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2.3.2 quiz: scientific models this mathematical model describes the cha…
D. The movement of the molecules will gradually increase.