Answer:
True
Explanation:
1. What does it mean to "tare" a balance?
Amino acid Is a compound that contains at least
They contain Carbon, Nitrogen, Hydrogen, Oxygen, and Sulfur
According to this food web, which of the following would be considered primary consumer?
A. Grasshoppers
B. Plants
C. Wolves
D. Mushrooms
Answer:
d mushrooms
Explanation:
The arrows on a food web point to where the energy source goes. Although mushrooms are considered decomposers, all the energy ends up at the mushroom and that is what makes a primary consumer the primary consumer no matter what.
ANSWER:
The answer is GRASSHOPPER
EXPLANATION:
Organisms feed on one another to obtain energy needed for metabolic activities. Food web is one of the ways by which the relationship between these organisms that feed on one another is displayed.
Energy flow starts from a PRODUCER, which is the plant in this food web. An organism (usually an herbivore) that feeds on the producer is referred to as PRIMARY CONSUMER. All consumers are incapable of synthesizing their own food, hence, they depend on other organisms. However, primary consumers directly depend on producers.
In the food web attached to this question as an image, the PRIMARY CONSUMER is the GRASSHOPPER because it directly feeds on the PRODUCER (plant).
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Choices: True, False. Select all that are True.
ON2 means that each nitrogen atom is separate from each other (not bonded).
N2 means that each nitrogen atom is bonded to another and they act as a unit.
2N is considered a molecule whereas N2 is not.
2N means that each nitrogen atom is separate from the other (not bonded).
2N means that each nitrogen atom is bonded to another and they act as a unit.
Answer:
a
Explanation:
N2 means that each nitrogen atom is bonded to another and they act as a unit. 2N means that each nitrogen atom is separate from the other. So the correct options are B and D.
What is a nitrogen molecule?
The chemical element nitrogen has an atomic number of seven (it has seven protons in its nucleus). Two nitrogen atoms are securely linked together to form the chemical molecule known as molecular nitrogen (N2). At normal temperatures and pressures, molecular nitrogen is a colorless, odorless, tasteless, and inert gas.
Nitrogen makes up around 78% of the Earth's atmosphere. Molecular nitrogen is a molecule that is practically inert due to the strong triple bond that connects its atoms. But when nitrogen bonds do break, the ensuing substances are frequently quite reactive.
Numerous different forms of contaminants include atoms of nitrogen. Nitric oxide (NO) and nitrogen dioxide can be produced during high-temperature combustion when nitrogen gas is present, such as in car engines (NO2). Both gases contribute to the creation of nitric acid, which is a component of acid rain, and peroxyacetyl nitrate (PAN), which is a key component of smog. They are both toxic on their own.
Therefore the correct options are B and D.
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Answer and I will give you brainiliest
Answer:
C. Solids
Particles are closely packed in solids and have less kinetic energy.
The ionization energy of carbon (C) is:________.
I. smaller than that of fluorine (F)
II. larger than that of fluorine (F)
because: ________.
III. Carbon has less electrons and less electron-electron repulsion making it easier to remove an electron from carbon.
IV. The effective nuclear charge of carbon is smaller, so the valence electrons feel a weaker pull from the nucleus.
V. In carbon, the electron being removed is closer to the nucleus.
VI. In carbon, the electron being removed is farther from the nucleus.
Explanation:
Ionization energy refers to the minimum amount of energy required to remove the valence electron of an isolated neutral gaseous atom or molecule. Generally, ionization energy increases from left to right across the periodic table.
This means that the ionization energy of Carbon would be smaller than that of Fluorine. The reason for this is due to the smaller effective nuclear charge.
The effective nuclear charge and the atomic size are two factors that ionization energy depends on.
The correct option is;
IV. The effective nuclear charge of carbon is smaller, so the valence electrons feel a weaker pull from the nucleus.
Which of the following is necessarily characterized by a covalent linkage?a. Base-pairing interactionb. Disulfide bondc. Hydrogen bondd. Induced fite. Van der Waals interaction
Answer:
b. Disulfide bond
Explanation:
Covalent linkage or bonding is a type of bond in which electrons are shared between atoms in a compound or molecule. Each atom contributes to the shared electron.
This is the case of disulfide bonding i.e. S-S, in which two thiol groups (-SH) share electrons with one another. The process of oxidation between two cysteine (amino acid) molecules forms this bond. Hence, Disulfide bond is characterized by a covalent linkage.
01:27:5
ES:
The table shows five items that a person may consider including in a safety contract.
Item number
1
2
Item
Label all containers.
Tie long hair back.
Bring a cell phone to the lab in case of emergency.
Bring a small laptop computer to the lab to use MSDS online.
Wear safety goggles at all times.
3
14
15
Which three of the five items would be best to include in a safety contract?
O 1, 2, and 3
1, 2, and 5
2, 3, and 4
3, 4, and 5
Answer: 1,2 and 5
Explanation:
Answer: B) 1,2, and 5
Explanation: got it right on edge
A space air is at a temperature of 75 oF, and the relative humidity (RH) is 45%. Using calculations, find: (a) the partial pressures of the dry air and water vapor, (b) the humidity ratio of the moist air, and (c) the specific volume of the moist air. Assume standard sea-level pressure.
Answer:
A) Partial Pressure of dry air = 13.32 KPa
Partial Pressure of water vapour = 1.332 KPa
B) Humidity ratio; X = 0.0691
C) V_p = 0.8384 m³/Kg
Explanation:
A) We are given;
Temperature = 75°F
Relative Humidity = 45%
Now,to calculate the partial pressure, we will use the relationship;
Relative Humidity = (Partial Pressure/Vapour Pressure) × 100%
Making partial pressure the subject;
Partial Pressure = Relative Humidity × Vapour Pressure/100%
From the first table attached, at temperature of 75°F, the vapor pressure is 29.6 × 10^(-3) bar = 29.6 KPa
Thus;
Partial Pressure of dry air = (45 × 29.6)/100
Partial Pressure of dry air = 13.32 KPa
From online values, vapour pressure of water vapour at 75°F = 2.96 KPa
Thus;
Partial Pressure of water vapour = (45 × 2.96)/100 = 1.332 KPa
B) humidity ratio of moist air is given as;
X = 0.62198 pw / (pa - pw)
where;
pw = partial pressure of the water vapor in moist air
pa = atmospheric pressure of the moist air
Thus;
X = (0.62198 × 1.332)/(13.32 - 1.332)
X = 0.0691
C) Formula for moist air specific volume is;
V_p = (1 + (xRw/Ra) × RaT/p
Where;
V_p is specific volume
T is temperature = 75°F = 297.039 K
p is barometric pressure which in this case is standard sea level pressure = 101.325 KPa
pw is partial pressure of the water vapor in moist air = 1.332 KPa
Rw is individual gas constant for water = 0.4614 KJ/Kg.K
Ra is individual gas constant for air = 0.2869 KJ/Kg.K
V_p = (1 + (0.0691 * 0.4614/0.2869)) × 0.286.9 * 297.039/101.325
V_p = 0.8384 m³/Kg
Which one of the following compounds produces a basic solution when dissolved in water? a. Na_2O b. CO_2 c. O_2 d. SO_2 e. OF_2
Answer:
a. Na_2O.
Explanation:
Hello,
In this case, the formation of a basic solution accounts for the formation of a base or hydroxide which contains hydroxide ions. Such hydroxides are formed via the combination reaction between water and a basic oxide which is formed by a metal and oxygen, that is way a. Na_2O forms the basic solution as it forms sodium hydroxide via:
[tex]Na_2O+H_2O\rightarrow 2NaOH[/tex]
Best regards.
PLEASE HELP WILL MARK BRANLIEST!!!!! Perform the following conversions. Show your set ups. a. 683 nanometer (nm) to angstrom (Å) b. 520 mi/h to m/sec c. 0.714 g/cm3 to lb/ft3 d. -164°C to °F
Explanation:
a. 1 nm = 10Å
683nm=683×10Å
=6830 Å
b. 1 mi/h=0.44704
520 mi/h=520×0.44704
=232.4608
c. 1 g/cm3=62.427961 lb/ft3
0.714 g/cm3=0.714×62.427961 lb/ft3
=44.573564
d. 1°C =9/5 +32 =33.8°F
-164°C = -164×9/5+32 = -263.2°F
Marks as brainest one.
The "Na" is called the element
Answer:
No
It's called a formula of an element which is a sodium element.
A 0.4066 g sample of a pure soluble chloride compound is dissolved in water, and all of the chloride ion is precipitated as AgCl by the addition of an excess of silver nitrate. The mass of the resulting AgCl is found to be 0.9260 g. What is the mass percentage of chlorine in the original compound? %
Answer:
The mass percentage of chlorine in the original compound is 56.32%
Explanation:
From the question,
Mass of original compound = 0.4066 g
To, determine the mass percentage of chlorine in the original compound,
First, we will determine the mass of chlorine present in the precipitated AgCl
Mass of precipitated AgCl = 0.9260 g
Molar mass of AgCl
Ag = 107.87 g/mol; Cl = 35.45 g/mol
Then, molar mass of AgCl = 107.87 + 35.45
= 143.32 g/mol
Now,
If 35.45 g of chlorine is present in 143.32 g of AgCl
Then, [tex]x[/tex] g of chlorine will be present in 0.9260 g of AgCl
[tex]x = \frac{35.45 \times 0.9260}{143.32}[/tex]
[tex]x = 0.2290[/tex] g
Hence, 0.2290 g of chlorine is present in 0.9260 g of AgCl.
Since all of the chloride ion is precipitated,
then 0.2290 g of chlorine is present in the original chloride compound.
Now, for the mass percentage of chlorine in the original compound,
mass percentage of chlorine =
(mass of chlorine in the compound /mass of the chloride compound) × 100%
mass of chlorine in the compound = 0.2290 g
mass of the chloride compound = 0.4066 g
∴ mass percentage of chlorine = [tex]\frac{0.2290}{0.4066}[/tex] × 100%
mass percentage of chlorine = 56.32%
Hence, the mass percentage of chlorine in the original compound is 56.32%
This group on the periodic table contains elements in the gas phase and are considered to be inert.
Answer:
noble gases
Explanation:
Group 8A — The Noble or Inert Gases. Group 8A (or VIIIA) of the periodic table are the noble gases or inert gases: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). The name comes from the fact that these elements are virtually unreactive towards other elements or compounds.
Answer:
noble gases
Explanation:
Gathering 8A — The Noble or Inert Gases. Gathering 8A (or VIIIA) of the intermittent table are the respectable gases or dormant gases: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). The name originates from the way that these components are practically lifeless towards different components or mixes.
g The tolerance of a Class A 50 mL transfer pipet is ±0.05 mL. A student uses an uncalibrated Class A transfer pipet to deliver a total of 150 mL of solution. What is the uncertainty in the delivered 150 mL? Note: tolerance is different from the uncertainty, so it does not follow the propagation formula of errors
Answer:
Uncertainty of tolerance transfer pipet = ± 0.15
Volume of liquid between = 149.85, 150.15
Given:
Size of transfer pipet = 50 ml
Tolerance transfer pipet = ± 0.05 ml
Total transfer = 150 ml
Find:
Uncertainty of tolerance transfer pipet
Computation:
Uncertainty of tolerance transfer pipet = [150 / 50](± 0.05)
Uncertainty of tolerance transfer pipet = [3](± 0.05)
Uncertainty of tolerance transfer pipet = ± 0.15
Volume of liquid between = (150-0.15), (150+0.15)
Volume of liquid between = 149.85, 150.15
what is a single celled organism able to do
Answer:
The one cell of a unicellular organism must be able to perform all the functions necessary for life. These functions include metabolism, homeostasis and reproduction. Specifically, these single cells must transport materials, obtain and use energy, dispose of wastes, and continuously respond to their environment.
Answer:
A single celled Organism is able to get energy from complex molecules, to move, and to sense their environment.
Explanation:
The ability to perform these and other functions is part of their organization.
List the inner planets in order from the closest to the Sun to the farthest from the Sun.
I HAVE 10 MINS HELP!!
Answer:
mercury, venus, mars, earth, jupiter, saturn, uranus, neptune
Explanation:
Answer:
Mercury,Venus,Mars,Earth,Jupiter,Saturn,
Uranus,Neptune.
Explanation:
Hope this helps
7. Elements in group one are called.
Answer:
The answer is alkali metals
Explanation:
What are the final hydrogen ion concentration and pH of a solution obtained by mixing 400mL of 0.2M NaOH with 150mL of 0.1M H3PO4?
Answer : The final hydrogen ion concentration is [tex]1.58\times 10^{-13}M[/tex]
Explanation :
The chemical reaction equation will be:
[tex]H_3PO_4+3NaOH\rightarrow Na_3PO_4+3H_2O[/tex]
In this reaction, 1 mole of [tex]H_3PO_4[/tex] reacts with 3 mole NaOH.
So, the number of moles of [tex]H_3PO_4[/tex] present in 150 ml of 0.1 M solution is calculated as follows.
Number of moles = Concentration × Volume
Number of moles = 0.1 M ×0.150 L = 0.015 mol
As it reacts with 3 moles of NaOH.
Number of moles of NaOH = 3 × 0.015 mol = 0.045 mol
So, moles of NaOH in 400 mL of 0.2 M NaOH is as follows.
Number of moles = 0.2 M × 0.4 L = 0.080 mol
Number of moles remained after the reaction = (0.080 - 0.045) mol = 0.035 mol NaOH in 550 ml (400 ml + 150 ml)
As molarity is the number of moles present in liter of solution. Hence, molarity of NaOH is as follows.
[tex]\text{Molarity}=\frac{\text{Number of moles}}{\text{Volume of solution}}[/tex]
[tex]\text{Molarity}=\frac{0.035mol}{0.550L}=0.0636M[/tex]
Now we have to determine the hydroxide ion concentration.
As, [tex][OH^-][/tex] = 0.0636 M
[tex]pOH=-\log [OH^-][/tex]
[tex]pOH=-\log 0.0636[/tex]
[tex]pOH=1.20[/tex]
Now we have to determine the pH.
As, pH + pOH = 14
pH = 14 - pOH
pH = 14 - 1.20
pH = 12.8
Now we have to determine the hydrogen ion concentration.
[tex]pH=-\log [H^+][/tex]
[tex]12.8=-\log [H^+][/tex]
[tex][H^+]=1.58\times 10^{-13}M[/tex]
Therefore, the final hydrogen ion concentration is [tex]1.58\times 10^{-13}M[/tex]
If our aim is to make 100% pure alum, how could large chunks be bad?
Answer:
It prevent the solution from making 100% pure alum.
Explanation:
Large chunks could be bad if we make 100% pure alum because the large chunks prevent the production of 100% pure alum so for making 100% pure alum, large chunks will be removed from the solution or process. Alum is a chemical compound having salt of sulfate attached with aluminum in hydrated form i. e. presence of water. It is widely used in vaccines and for the purification of drinking water.
Which chemical symbol describes an element?
o H2O
o 02
o CH4
o H2 SO4
Answer:
H20
Explanation:
. It is a symbol of water where H = Hydrogen, O = Oxygen and2 Elements in hydrogen and 1 element in oxygen;therefore its known as H2O.
H2O is chemical symbol describes an element.
What is chemical symbol?The chemical symbol is a representation of the name of the chemical element which is discovered and expressed in the periodic table, a type of matter that is classified by the atomic number.
The periodic table the chemical elements are present according to their atomic number, electron configuration, and chemical properties.
It help everyone from different language background and used in identification of the element according to the universal chemical symbol, some symbols are H for hydrogen, Cu for copper.
Chemical symbols also applied in case of certain elements which make up the matter like water is made up of two molecules of hydrogen and 1 of oxygen, which is represented with the chemical symbol of H2O.
The chemical element is made up of atoms which have the same number of protons called the atomic number, simplest form of a substance and contains one class of atoms.
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CALCULATE: you need to type/show your work. There is no credit if the work is not show/typed Titanium has five common isotopes: 46Ti (8.00%), mass= 45.953 amu 47 Ti (7.80%), mass= 46.952 amu 48Ti (73.40%), mass= 47.947 amu 49Ti (5.50%), mass= 48.948 amu 50Ti (5.30%), mass = 49.945 amu Calculate the average atomic mass of titanium.
Answer:
47.871 amu
Explanation:
Average atomic mass of an atom is obtained from the sum of the mass of the isotopes multiplicated by its natural abundance.
That means atomic mass of Ti is:
Ti = 45.953*8.00% + 46.952*7.80% + 47.947*73.40% + 48.948*5.50% + 49.945*5.30%
Average atomic mass of Ti:
47.871 amuThis type of pollution will decay naturally
How many electrons are found in an atom of Oyxgen?
10 points
16
O 24
8
Answer:
8 electrons.
Explanation:
On a periodic table, one can see that Oxygen has 8 protons.
The number of protons in a neutral atom will always equal the number of electrons.
Which of the following processes is used to test for drunk driving and also to break down alcohol in the body?
a. transesterification
b. E1 elimination
c. alcohol oxidation
d. ketone reduction
Answer:
c. alcohol oxidation
Explanation:
The police often use a device called a breathalyzer to test drivers suspected of being drunk. The chemical basis of this device is a redox reaction. A sample of the driver’s breath is drawn into the breathalyzer, where it is treated with an acidic solution of potassium dichromate. The alcohol (ethanol) in the breath is converted to acetic acid as shown in the following equation:
3 CH₃CH₂OH + 2 K₂Cr₂O₇ + 8H₂SO₄ → 3 CH₃COOH + 2 Cr₂(SO₄)₃ + 2 K₂SO₄ +1 11H₂O
ethanol + potassium dichromate (orange yellow) + sulfuric acid → acetic acid + chromium(III) sulfate (green) + potassium sulfate + water
In this reaction, the ethanol is oxidized to acetic acid and the chromium(VI) in the orange-yellow dichromate ion is reduced to the green chromium(III) ion. The driver's blood alcohol level can be determined readily by measuring the degree of this color change (read from a calibrated meter on the instrument).
does a light bulb collect energy?NEED HELP ASAP
2. Problem: Is colored or black and white text more easily remembered? Hypothesis: If the text is colored, then the text is more easily remembered. Dependent variable: Independent variable: Control: Constants: ___________________________________________________________________ 3. Problem: Does temperature affect the speed of ants? Hypothesis: Independent variable: Dependent variable: Control: Constants: ----------------------------------------------------------------------------------------------------------------------------- 4. Problem: Does pH of the soil affect the growth of strawberries? Hypothesis: Independent variable: Dependent variable: Control: Constants: ___________________________________________________________________ 5. Problem: Does caffeine raise a person’s blood pressure? Hypothesis: Independent variable: Dependent variable: Control: Constants: ___________________________________________________________________ 6. Problem: Is heart rate affected by music? Hypothesis: Independent variable: Dependent variable: Control: Constants: ___________________________________________________________________ 7. Problem: Does bleach kill bacteria? Hypothesis: Independent variable: Dependent variable: Control:
Answer:
This question contains a lot of subsections. Please find the variables to each question below
Explanation:
Hypothesis is a testable explanation to a scientific question. It aims at proffering a testable solution to an observed problem. It usually goes in an IF, THEN format.
Dependent variable is the variable being measured in an experiment, while the independent variable is the variable that is manipulated or changed by the experimenter.
The control group is the group that does not receive the experimental treatment while constant is the variable that is kept unchanged for all groups in the experiment.
Based on this explanation, find the answers to the hypothesis, independent variable, dependent variable, constant, and control groups to each question.
2. Dependent variable: How easy it is to remember
Independent variable: Color of the text
Control: Group given Black and White text to read
Constants: Same text
3. Hypothesis: If the temperature is increased, THEN the speed of ants increases or move faster
Independent variable: TEMPERATURE
Dependent variable: SPEED OF ANTS
Control: Ants placed in room temperature
Constants: SAME KIND OF ANTS
4. Hypothesis: IF the pH of the soil is acidic or alkaline, THEN the growth of strawberries will be inhibited
Independent variable: pH of soil
Dependent variable: Growth of strawberries
Control: Strawberries grown in a Neutral pH soil
Constants: Same type of plants (strawberries)
5. Hypothesis: IF caffeine is taken, then the blood pressure will be increased or raised.
Independent variable: CAFFEINE
Dependent variable: BLOOD PRESSURE
Control: Group given no caffeine
Constants: Same amount of caffeine
6. Hypothesis: IF music is played, THEN the heart rate increases
Independent variable: MUSIC
Dependent variable: HEART RATE
Control: Groups placed where no music is played
Constants: Same type of music, same time music runs for etc.
7. Hypothesis: IF bleach is present/used, THEN bacteria will die
Independent variable: Bleach
Dependent variable: Death of bacteria
Control: Bacteria given no bleach
Constants: Same species of bacteria, Same type of bleach
What is the correct name for the compound Pb(CH3CO2)2?
Answer:
Lead(II) acetate trihydrate
Explanation:
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How does physical properties differ from chemical properties? 1.Chemical properties are observed using your senses. 2.Chemical properties can only be observed using your taste sense. 3.Physical properties can be observed and chemical properties cannot. 4.Physical properties cannot be observed and chemical properties can.
Answer:
3. Physical properties can be observed and chemical properties can't
Adding sodium hydride to ethanol would produce:________
A) CH_3CH_2OCH_2CH_3 + H_2
B) CH_3CH_2OCH_2CH_3 + NaOH
C) CH_3CH_2ONa + H_2
D) CH_3CH_2Na + NaOH
E) CH_3CH_3 + NaOH
