Answer:
Water in a freezer at -2 degrees Celsius
If 11 kJ of heat is transferred to 2300 g of soil at 21°C, what would the new temperature of the soil be?
Answer:
26.98°C
Explanation:
Applying,
Q = cm(t₂-t₁)................ Equation 1
Where Q = Heat transferred to the soil, c = specific heat capacity of dry soil, m = mass of the soil, t₂ = final temperature, t₁ = initial temperature.
From the question,
Given: Q = 11 kJ = 11000 J, m = 2300 g = 2.3 kg, t₁ = 21°C
Constant: c = 800 J/kg.°C
Substitute these values into equation 1
11000 = 800×2.3(t₂-21)
Solving for t₂
t₂-21 = 11000/(800×2.3)
t₂-21 = 11000/1840
t₂-21 = 5.98
t₂ = 5.98+21
t₂ = 26.98°C
What would a chemist most likely study about a car? 1- The amount of rotations of the wheel that occur in 1 mile. 2- The reaction of gasoline combustion in the engine. 3- The accuracy of the speedometer. 4- The strength of the car frame.
Answer:
b
Explanation:
e2020
Answer:B
Explanation:It was correct
how many elements have been discovered so far by scientists
Answer:
118 elements have been discovered so far
Explanation:
seperate red and blue ink plzz answer this
Pls answer ill give brainliest question in picture
Answer: A & D
Explanation:
The two main forces are temperature and salinity.
Why do you think there was a rush to mass-produce penicillin around the time of World War II?
Answer:
penicillin could protect mice against infection from deadly Streptococci.
Explanation:
Answer:
In 1940, Florey carried out vital experiments, showing that penicillin could protect mice against infection from deadly Streptococci.
Warning signs of this extreme event include gas eruptions, tremors, change in size or shift, and change in magnetic field
Answer:
convection within Earth’s interior
Explanation:
Complete question
Name this event
Solution
During the convection within Earth’s interior , the earth's core undergo convection leading to turbulent dynamic that further leads to changing of magnetic field.
Due to movement of core material, there is interaction between the mantle convection and plate motions.
AYUDENME A CONTESTAR ESTO
https://e.edim.co/138898558/YqrpnNCq7OMnJjYa.pdf?response-content-disposition=filename%3D%22Reactivos_nomenclatura.pdf%22%3B%20filename%2A%3DUTF-8%27%27Reactivos%2520nomenclatura.pdf&Expires=1625066033&Signature=IkCTze7KbrYuHcpGqGB24BPnK3jXMdIA1QnCXyqFVbHGjiuyB69cK-OmzbNi-3i6caTcSlgeKvDOQXMLBOGwTbYw-D~8DUaBtiifkUzpiRjtZBa8PBVGWv6W~zbiBvcQeefWPuAMMxf2wkm20T2C2BJQ-3JmHP97UcMpKwIt-tdAX8GniYpZTw8lok9iFTJN0XO5pWW6S5uxnopSP498ubaWmWUQ1xRfOD-BAcUZmPeqXgrmRxRYY2OMHRvSkkVf-iYWP9dMrpYfiD5jjr1kQFd0iINg8y~RFMQ-mUPbCjZZWJTJkhDAH9XZt9hM6dlvzQuvmm~8xMX7Ib-ACmoNCA__&Key-Pair-Id=APKAJMSU6JYPN6FG5PBQ
umm how do you begin answering that ??
how are the environment of a desert and a tundra different
A: A tundra is at a higher latitude than a desert
B: A tundra is less humid than a desert
C: A tundra is much humid than a desert
D: A tundra receives less precipitation than a desert
<FIRST ANSWER>
The answer is A; tundra is at a higher latitude than a desert
Explanation:
Both a tundra and a desert are very dry, so that eliminates B and C.
And as for D, Tundra receives more rain than a desert does, so that eliminates D.
How many molecules of water are in 3.8 moles of water?
Answer:
2.29*10^24 molecules of water
Explanation:
1 molof water =6.022*10^23 molecules of water
therefore
molecules of water = 3.8*6.022*10^23
Answer:
one mole of water contains 6.02 x 1023 MOLECULES of water.
But each molecule of water contains 2 H and 1 O atom = 3 atoms, so there are approximately 1.8 x 1024 atoms in a mole of water.
Explanation:
1. The motion of an object with constant acceleration is also known as ________. *
Motion
Uniform Motion
Constant Motion
Uniformly Accelerated Motion
2. A sepaktakraw ball is hit vertically upward by a player. What is its acceleration after 1 second? *
0
1 m/s2
19.8 m/s2
-9.8 m/s2
3. If a freely falling ball is somehow equipped with a speedometer, by how much would its speed-reading increase for every second? *
0 m/s
9.8 m/s
10 m/s
20 m/s
4. It is any motion of a body where gravity is the only force acting upon it (no friction or air resistance). *
freefall
gravity
acceleration
velocity
5. Objects fall at constant acceleration also known as acceleration due to gravity equivalent to *
1 point
9.8 m/s
9.8 m2/s
-9.8 m/s2
20 m/s
For questions 6-10, consider the illustration below.
6. At what angle of release makes the projectile reach the maximum height? *
15°
30°
45°
60°
75°
60° & 30°
30° & 75
7. Which of the following pairs of angles will make projectiles reach the same range? *
15°
30°
45°
60°
75°
60° & 30°
30° & 75
8. Which angle of release makes the projectile reach the longest range? *
15°
30°
45°
60°
75°
60° & 30°
30° & 75
9. Which angle of release are complementary angles? *
15°
30°
45°
60°
75°
60° & 30°
30° & 75
10. At what angle should a water hose be aimed for the water to land with the greatest horizontal range?
15°
30°
45°
60°
75°
60° & 30°
30° & 75
11. Which of the following statements describes momentum? *
the product of body's mass and velocity
the sum of body's mass and velocity
the product of body's mass and acceleration
the sum of body's mass and acceleration
12. Two identical cars are travelling along EDSA. Which of the two cars would have a greater momentum? *
the slower car
the faster car
both have the same momentum
13. Which has more momentum, a huge truck that is not moving or a bicycle that is moving? *
truck
bicycle
both have the same momentum
14. What are the two factors that affect the momentum of an object? *
velocity and time
force and velocity
mass and velocity
acceleration and force
15. Which has more momentum, a heavy truck moving at 30 km/h or a light truck moving at 30 km/hr? *
heavy truck
light truck
both have the same momentum
Answer:
i can't answer sorry
Explanation:
i had confused
how to deal with gender based violence as an individual
Answer:
Raise awareness of the dangers of harmful traditions. ...
Tackle violence against girls in school. ...
Challenge and speak out about violence in the home. ...
Transform attitudes towards harmful practices at multiple levels. ...
Listen to girls' experiences of violence - and their solutions.
Which of the following elements is used to make metal products?
oxygen
potassium
calcium
iron
Its Iron and Potassium because if you look at the periodic table,and you go down the list of metals, you can see what metals are there.
what is the hardest metal?
1. Cesium
2. Titanium
3. Chromium
4. Magnesium
Quickly please!
Answer:
i believe it is titanium.
Explanation:
Answer:
2. Chromium
Explanation:
how can you use the information from the sim to respond to the forum user?Please help
Answer:
The forum user pointed out that energy began transferring into the lake as ... How can you use the information from the Sim to respond to the blogger
Explanation:
Which type of substance ionizes partially and gives off hydrogen ions when dissolved in
water? (5 points)
Weak base
weak acid
Strong acid
Strong base
Answer:
strong acid
Explanation:
In a titration of hydrobromic acid (HBr) against sodium hydroxide (NaOH), 22.20 mL of 0.150 M NaOH is required to neutralize 36.60 mL of HBr. Calculate the molarity of the HBr. M1V1=M2V2
Answer:
[HBr] = 0.0910 M
Explanation:
NaOH → Strong base
HBr → Strong acid.
This is a titration that involves a strong acid and a strong base, so the recaction is about acid base equilibrium.
Formula for titration in the equivalence point is:
mmoles of acid = mmoles of base
M . Volume of acid = M . volume of base
We replace data:
M . 36.60 mL = 0.150 M . 22.20 mL
M = (0.150 M . 22.20 mL) / 36.60 mL
M = 0.0910 mol/L
Give the number of protons and neutrons in the nucleus of an atom of each of the following isotopes, and the number of electrons in a neutral atom of that isotope:
a. copper-65
b. helium-4
c. cobalt-60
d. nitrogen-15
Answer:
The development of modern atomic theory revealed much about the inner structure of atoms. It was learned that an atom contains a very small nucleus composed of positively charged protons and uncharged neutrons, surrounded by a much larger volume of space containing negatively charged electrons. The nucleus contains the majority of an atom’s mass because protons and neutrons are much heavier than electrons, whereas electrons occupy almost all of an atom’s volume. The diameter of an atom is on the order of 10−10 m, whereas the diameter of the nucleus is roughly 10−15 m—about 100,000 times smaller. For a perspective about their relative sizes, consider this: If the nucleus were the size of a blueberry, the atom would be about the size of a football stadium (Figure 1).
Figure 1. If an atom could be expanded to the size of a football stadium, the nucleus would be the size of a single blueberry. (credit middle: modification of work by “babyknight”/Wikimedia Commons; credit right: modification of work by Paxson Woelber)
Atoms—and the protons, neutrons, and electrons that compose them—are extremely small. For example, a carbon atom weighs less than 2 × 10−23 g, and an electron has a charge of less than 2 × 10−19 C (coulomb). When describing the properties of tiny objects such as atoms, we use appropriately small units of measure, such as the atomic mass unit (amu) and the fundamental unit of charge (e). The amu was originally defined based on hydrogen, the lightest element, then later in terms of oxygen. Since 1961, it has been defined with regard to the most abundant isotope of carbon, atoms of which are assigned masses of exactly 12 amu. (This isotope is known as “carbon-12” as will be discussed later in this module.) Thus, one amu is exactly 112112 of the mass of one carbon-12 atom: 1 amu = 1.6605 × 10−24 g. (The Dalton (Da) and the unified atomic mass unit (u) are alternative units that are equivalent to the amu.) The fundamental unit of charge (also called the elementary charge) equals the magnitude of the charge of an electron (e) with e = 1.602 × 10−19 C.
A proton has a mass of 1.0073 amu and a charge of 1+. A neutron is a slightly heavier particle with a mass 1.0087 amu and a charge of zero; as its name suggests, it is neutral. The electron has a charge of 1− and is a much lighter particle with a mass of about 0.00055 amu (it would take about 1800 electrons to equal the mass of one proton. The properties of these fundamental particles are summarized in Table 3. (An observant student might notice that the sum of an atom’s subatomic particles does not equal the atom’s actual mass: The total mass of six protons, six neutrons, and six electrons is 12.0993 amu, slightly larger than 12.00 amu. This “missing” mass is known as the mass defect, and you will learn about it in the chapter on nuclear chemistry.)
Classify CH3CH2NHCH3 as a strong base or a weak base
Answer: Weak
I hope this helps
CH[tex]_3[/tex]CH[tex]_2[/tex]NHCH[tex]_3[/tex] is a weak base. The hydroxides of alkali or alkaline earth metals as well as ammonia and its organic metabolites in water solutions are examples of bases.
What is base?Any material that is slippery in the touch, smells bitter, alters the colour of indications (such as turning red litmus paper blue), combines with acids to produce salts, and catalyses particular chemical reactions (starting point catalysis) is considered a base in chemistry. The hydroxides of alkali or alkaline earth metals as well as ammonia and its organic metabolites (amines) in water solutions are examples of bases.
These compounds cause water solutions to contain hydroxide ions (OH-) (see Arrhenius theory). The Brnsted-Lowry theory like the Lewis theory provide broader definitions of bases that encompass chemicals that demonstrate typical basic behaviour in their original compounds or while dissolved in solutions other than water. CH[tex]_3[/tex]CH[tex]_2[/tex]NHCH[tex]_3[/tex] is a weak base.
Therefore, CH[tex]_3[/tex]CH[tex]_2[/tex]NHCH[tex]_3[/tex] is a weak base.
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What reaction involves one element replacing an element in a compound that is from the same activity series?
How many atoms of hydrogen are present in a container of water if you have 1.50 x 1023 atoms of oxygen present?
Answer:
3.00 × 10²³ atoms H
Explanation:
Step 1: Given data
Atoms of oxygen in water: 1.50 × 10²³ atomsChemical formula of water: H₂OStep 2: Calculate the number of atoms of hydrogen
According to the chemical formula of water, the atom ratio of H to O is 2:1.
1.50 × 10²³ atoms O × 2 atoms H/1 atom O = 3.00 × 10²³ atoms H
What is 25 Ml into L
Answer:
0.025 liters
Explanation:
divide 25 into 1000
Answer:
25 mL = 0.025 L
Explanation:
edge 2023
Where are the electrons found in Bohr's atomic model? O A. The electrons orbit the protons at the atom's center. B. The electrons circle the nucleus in specific orbits. C. The electrons are evenly distributed throughout the atom. O D. The electrons occupy the atom's center, with protons orbiting.
Answer:
O A. The electrons orbit the protons at the atom's center
Explanation:
It was proved by Bohr that electrons are revolving in orbits which creates magnetic fields around the atom.
What would a chemist likely study about a car?
A) The amount of rotations of the wheel that occur in 1 mile.
B) The reaction of gasoline combustion in the engine.
C) The accuracy of the speedometer.
D) The strength of the car frame.
Answer
b b b b b b b b b b b b b b b
Explanation:
How many molecules of HCl are needed to react with 1.7 moles of magnesium. The products of
the reaction are magnesium chloride and hydrogen gas.
2HCl + Mg --> MgCl2 + H2
(pls help)
Answer:
2.05 x 10²⁴ molecules
Explanation:
The balanced equation for the chemical reaction is the following:
2 HCl + Mg → MgCl₂ + H₂
According to the equation, 2 moles of HCl are required to react with 1 mol of magnesium (Mg), so the moles of HCl required to react with 1.7 mol Mg are calculated as follows:
moles HCl = 1.7 mol Mg x 2 mol HCl/mol Mg = 3.4 mol HCl
We know that 1 mol of any compound is equal to 6.022 x 10²³ molecular entities, so we convert the moles of HCl to molecules as follows:
molecules HCl = 3.4 mol HCl x 6.022 x 10²³ molecules/1 mol = 2.05 x 10²⁴ molecules
The reduction of aldehydes, ketones, organic acids and their derivative of the process of alcohols is used for
Answer:
Widening of blood vessels.
Explanation:
The reduction of aldehydes, ketones, organic acids causes the formation of alcohols that is used for different process in the human body. This alcohol increase the width of the blood vessels as it enters the bloodstream causing greater flow of blood to the skin surface as well as temporary feeling of warmth. It also increased heat loss and rapid body temperature decrease that produces cooling effect in the body.
Both potassium chloride and calcium carbonate are white solids. Give two tests you would use to distinguish them.
Answer:
Potassium carbonate is soluble in water, while calcium carbonate is insoluble. Weigh a sample of the unknown mixture accurately and stir the sample with water. Filter the suspension and find out the mass of the residue collected. It gives the amount of insoluble calcium carbonate present in the mixture.
Explanation:
How many molecules are in 4 moles of carbon monoxide (CO)?
Select one:
a. 2.41x1024 CO molecules
b. 24.1x1023 CO molecules
c. 6.64x1024 CO molecules
d. 1.51x1023 CO molecules
Answer:
A
Explanation:
because number of particle = moles × 6.02 × 10^23
which gives the answer as an A
2.41x10²⁴ molecules are in 4 moles of carbon monoxide (CO). Therefore, the correct option is option A.
What is molecule?The smallest recognizable unit into that a pure substance may be divided while retaining its composition as well as chemical properties is a molecule, which is a collection of atoms that are at least two in number. Until parts made up of a single molecule are reached, the division of an example of a substance smaller progressively smaller parts does not result in a change with regard to its composition nor its chemical properties.
Still smaller sections of the substance are produced by further subdivision, and these components are always different chemically and typically have different compositions from the initial substance. The chemical links that link the atoms in the molecule together are severed during this final step of fragmentation.
molecules = moles × 6.022×10²³
= 2.41x10²⁴
Therefore, the correct option is option A.
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a gas mixture containing hydrogen, oxygen, and nitrogen has a total pressure of 840 torr. if p hydrogen = 320 torr and p oxygen = 485 torr, what is the partial pressure of nitrogen in the mixture? please help
Answer
35 torr
Explanation:
The mixture contains 320 torr of hydrogen, 485 torr of oxygen, a total pressure of 840 torr, so you need to find the leftover
320(hydrogen) + 485(oxygen) = 805 torr
840(total) - 805 = 35 torr
What is Williamson's synthesis?
Answer:
The name of the reaction was coined after Alexander William Williamson developed it in 1850.Williamson Ether Synthesis is a reaction that uses deprotonated alcohol and an organohalide to form an ether. 1. Williamson Ether Synthesis usually takes place as an SN2 reaction of a primary alkyl halide with an alkoxide ion.
Explanation:
yeah