Answer:
147.5 grams
Explanation:
Let the required mass of ground beef be m .
protein in it = .213 m
fat in it = .169 m
1 gram of protein gives 4 cals .
1 gram of fat gives 9 cals .
cals given by .213 m protein = 4 x .213 m .
cals given by .169 m fat = 9 x .169 m .
4 x .213 m + 9 x .169 m = 350
.852 m + 1.521 m = 350
2.373 m = 350
m = 147.5 grams Ans
What is needed to burn the candle (reactant)?
Answer:
wax, candlewick, and oxygen
Explanation:
The burning of the candle is both a physical as well as a chemical change. The reactants are the substances or the raw materials that are required for a reaction to the process. In the process of burning a candle, the reactants are the fuel which includes wax and wick, and oxygen which is found in the air. The products found at the end of the reaction are carbon dioxide and water vapor.
can you help me what is the arrhenius concept of acid and bases explain in detail
Answer:
Explanation:
The Arrhenius definition of acid-base reactions, which was devised by Svante Arrhenius, is a development of the hydrogen theory of acids. It was used to provide a modern definition of acids and bases, and followed from Arrhenius’s work with Friedrich Wilhelm Ostwald in establishing the presence of ions in aqueous solution in 1884. This led to Arrhenius receiving the Nobel Prize in Chemistry in 1903.
As defined by Arrhenius:
An Arrhenius acid is a substance that dissociates in water to form hydrogen ions (H + ). In other words, an acid increases the concentration of H + ions in an aqueous solution. This protonation of water yields the hydronium ion (H 3 O + ); in modern times, H + is used as a shorthand for H 3 O + because it is now known that a bare proton (H + ) does not exist as a free species in aqueous solution.
An Arrhenius base is a substance that dissociates in water to form hydroxide (OH – ) ions. In other words, a base increases the concentration of OH – ions in an aqueous solution.
Silver has a density of 10.5 g/cm and gold has a density of 19.3 g/cm. Which would
have a greater mass, 5 cm of silver or 5 cm of gold?
Answer:
Hey there!
Gold would have a greater mass, because density is mass/volume, and if the density is greater, so is the mass.
Let me know if this helps :)
In the same science fair, Tina asks the question "Does caffeine increase the heart rate of an earthworm?" In Test 1, she measures the heart rate by looking at the earthworm under a microscope, the earthworm has a heart rate of 50 bpm (beats per minute). In Test 2, she places a few drops of caffeine on the earthworm's skin and measures the rate again. In this test, the heart rate is 68 bpm. 6) What is the Independent/Manipulated variable? 7) What is the Dependent/Responding variable? 8) Tina's experiment should have included a hypothesis. In a complete sentence, suggest a hypothesis for Tina's experiment. You may use an if/then statement.
Answer:
Independent variable- effect of caffeine
Dependent variable- heart rate
Hypothesis- If a stimulant such as caffeine is administered to earthworm, then its heart rate increases.
Explanation:
The experiment is based on the research question; "Does caffeine increase the heart rate of an earthworm?" We can see from this research question that the independent variable is the effect of caffeine and the response it produces is a change in the heart rate (the dependent variable)
This now leads us to a hypothesis that states thus; 'If a stimulant such as caffeine is administered to earthworm, then its heart rate increases.'
What properties you can determine for carbon and calcium based on their respective locations on the periodic table
Answer:
Carbon is non metal because it is found in the right side of the periodic table while calcium is metal because it is found in the left side of the periodic table.
Thanks for the help :) Question attached below:
• Take a look at the steps below to see how to balance this equation. Let's start by writing the unbalanced equation given the information.
Unbalanced Equation : C₃H₈ (g) + O₂ (g) → CO₂ (g) + H₂O (g) ,
Start by Balancing the Carbons : C₃H₈ (g) + O₂ (g) → 3CO₂ (g) + H₂O (g)
Now let's balance the Hydrogen : C₃H₈ (g) + O₂ (g) → 3CO₂ (g) + 4H₂O (g)
Balancing the Oxygen : C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g)
Balanced Equation : C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g)
• Let's apply dimensional analysis here,
0.7 L propane × (5 liters Oxygen / 1 liter Propane) = 3.5 Liters of Oxygen
• Similarly we can identify the liters of carbon dioxide produced in the reaction,
0.7 L propane × (3 liters Carbon Dioxide / 1 liter Propane) = 2.1 Liters of Carbon Dioxide
• 0.7 L propane × (4 liter water vapor / 1 liter propane ) = 2.8 Liters of Water Vapor
Imagine that Ana has a block made of pure gold. If she cuts this block into two equal pieces, pick the statement that best describes the resulting pieces.
Answer : The correct statement is:
The density of each piece is the same as that of the original block.
Explanation :
Intensive property : It is defined as a property of substance which does not change as the amount of substance changes.
Examples: Temperature, refractive index, density, hardness, etc.
According to question, if Ana has a block made of pure gold and she cuts this block into two equal pieces then the density of each piece is the same as that of the original block because density is an intensive property that does not changes until and unless material is changed.
That means density remains same as that of the original piece.
Hence, the correct statement is the density of each piece is the same as that of the original block.
please help, ive been putting 3 for the coefficient and 14 for the exponent but, it keeps saying it’s wrong. any help is appreciated.
Answer:
3 × 10¯¹⁰
Explanation:
9×10² ÷ 3×10¹²
The above expression can be evaluated as follow:
9×10² ÷ 3×10¹²
Recall:
3² = 9
3¹ = 3
Therefore,
9×10² ÷ 3×10¹² = 3²×10² ÷ 3¹×10¹²
Recall:
y^m ÷ y^n = y^(m – n)
Therefore,
3²×10² ÷ 3×10¹² = 3²¯¹ × 10²¯¹²
= 3¹ × 10¯¹⁰
Recall:
y¹ = y
Therefore,
3¹ × 10¯¹⁰ = 3 × 10¯¹⁰
Therefore,
9×10² ÷ 3×10¹² = 3 × 10¯¹⁰
A top fuel dragster is designed to go from 0 to 100 miles per hour in a mere 0.8
seconds. Calculate its acceleration. Show your work and include units.
Answer:
Acceleration, [tex]a=55.88\ m/s^2[/tex]
Explanation:
It is given that, A top fuel dragster is designed to go from 0 to 100 miles per hour in a mere 0.8.
Initial velocity, u = 0
Final velocity, v = 100 mph
1 mph = 0.44704 m/s
100 mph = 44.704 m/s
Time, t = 0.8 s
We need to find its acceleration. Rate of change of velocity equals acceleration.
[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{44.704-0}{0.8}\\\\a=55.88\ m/s^2[/tex]
So, the acceleration is [tex]55.88\ m/s^2[/tex]
Which metalloid is also a chalcogen?
Answer:
Oxygen or sulfur I believe since they fall in the same group.
Answer:
Oxygen is one of them.
how does getting funding from the government affect scientific research?? a- the government helps the scientist decide what research is important b- the government tells the scientist what research they can do c-scientist can only do research that helps the government protect its citizens d- scientist have to follow government rules made to protect people
Answer:
d- Scientists have to follow government rules made to protect people.
Explanation:
Scientific research fosters our understanding of the world around us. It helps people to learn to promote critical thought and problem-solving. Although there may not be an immediate practical use of the research, in the long term the study could benefit humanity. Scientific research is the product of creative ideas and collaborative communication that the proper role of government is often restricted to funding the research. The role of the government is to perform its reasonable and valid duties of defending human rights and enhancing the independence of the human.
Answer:D
Explanation:
Please I have no idea my teacher didn’t teach this
Answer:
B (40º c)
Explanation:
Rubidium being silvery-white and melting at 39 ºC. Which means 40º C is the closest.
Carbon burns in air to release energy along with formation of which carbon dioxide carbon dioxide and water carbon dioxide and hydrogen carbon monoxide and water
Answer:
CO2 and O2
Explanation:
Is sodium ion or sodium metal in table salt?
Answer:
sodium ion
Explanation:
The growth rate is the death rate minus the birth rate these change because birth rates and
death rates increase or decrease
O True
False
Question 3
1 pts
Answer:
Hey there!
False. The growth rate is actually the birth rate minus the death rates.
Let me know if this helps :)
4. Refer the table given below to answer the questions fon Electronic configuration Element Atomic number 11 R 19 2,8,1 2,8,8, 1 2,8,8, 92 20 S T 12 2,812. Are the above elements Q, R, S and I metals or non-metals? Support your answer with reasona.
Answer:
The electronic configuration of the element with Atomic number 19 is 2,8,8,1. The element is potassium. It is an alkali metal with one valence electron.
The first mechanistic step in the direct reaction of an amine with a carboxylic acid to produce an amide is ________.
A) an acid-base reaction
B) nucleophilic attack on the carbonyl carbon
C) loss of H2O
D) loss of CO2
E) loss of N2
Answer:
The first step is - option A) an acid base reaction.
Explanation:
The direct reaction of a carboxylic acid with an amine to form an amide is expected to be difficult as it would deprotonate the carboxylic acid and make a nonreactive carboxylate.
The first step in this reaction would be an acid - base reaction as protonation of the carbonyl carbon, that involves the interchange of proton in between electric charge or neutral compound, it is also known as protonation or deprotonation. The acid base reaction is followed by the nucleophilic attack on the carbonyl carbon.
Thus, The first step is - option A) an acid base reaction.
Which best describes the role of a primary consumer in a food web? Carnivore that feeds on producers Herbivore that feeds on producers Herbivore that feeds on primary consumers Carnivore that feeds on primary consumers
A food web is the interconnection of the various food chains. A herbivore is a primary consumer that feeds on the producers in a food web. Thus, option B is correct.
What is a primary consumer?A primary consumer is an organism that appears second at the trophic level after the producers in an ecological pyramid of the food web and food chain. They feed on the producers to gain energy.
The primary consumer is herbivores as they mainly eat the producers that are planted in a food web. They get the maximum amount of energy as a consumer in a pyramid.
They only eat plants hence called herbivores. They get eaten by the secondary consumers that are omnivores and carnivores as they eat plants and animals both.
Therefore, option B. primary consumer are herbivore that eats producers.
Learn more about primary consumers here:
https://brainly.com/question/11173626
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Match the name of each gas law to the properties it compares. Boyle's law Charles's lawGay-Lussac's lawA) Pressure and volume B) Temperature and volume C) Pressure and temperature
Answer:
Boyle's law: A) Pressure and volume.
Charles's law: B) Temperature and volume.
Gay-Lussac's law: C) Pressure and temperature.
Explanation:
Hello,
In this case, since Boyle's law study the relationship between pressure and volume at constant temperature as an inversely proportional one, we have:
Boyle's law: A) Pressure and volume.
Next, since the Charles' law study the relationship between the volume and the temperature at constant pressure as a directly proportional one, we have:
Charles's law: B) Temperature and volume.
Then, since the Gay-Lussac's law study the relationship between the pressure and the temperature at constant volume as a directly proportional one as well, we have:
Gay-Lussac's law: C) Pressure and temperature.
Best regards.
Answer:
D, B, E
Explanation:
*
6. "The mixture is green in color." This confirms that the mixture is a
The question is incomplete, so the complete question is as follows:
"The mixture is green in color.” This confirms that the mixture is a.
A) suspension B) solution C) colloid D) this proves nothing
Answer:
D) this proves nothing
Explanation:
The green-colored mixture does not prove anything about the mixture because only the color of mixture can not decide the typw of mixture.
Several other properties affecting the type of mixture are the size of particles and also dispersion of particles in the solution.
Hence, the correct answer is "D",
How is heat measured?
Answer:
To measure heat, you divide the change in temperature of a sample of water by the mass of the water.
Which of the following does not take place in the "Experiment step of the scientific method?
A. Making a bar graph
B. Creating the procedures
Collaborative Lesson Planning
C. Making a materials list
D. Conducting the experiment
Lamar has been running sprints tp prepare for his next football game. He has found that he can maintain his maximum speed for 45 yards. He's thinking of running in a 5 km race in a few months, but doesn't know if he can maintain his maximum speed for the entire 5 km. Can you help him determine how far he can?
Answer and Explanation:
Given that
Length of race = 5km
Maximum speed = 45 yards
Based on the above information,
We transform the yards to kilometer i.e.
1 km = 1093.613 yards
And,
x = 45 yards
So,
1093.613 × x = 45
x = 45 ÷ 1093.613
x = 0.0411480 km
Where
x = Maximum length for which the maximum speed demonstrated in kilometers is sustained.
So, we concluded that Lamor cannot go for the overall 5km as he maintained till 0.0411 km
you have a hypothesis that you can dissolve more sugar in hot water than cold water
what is the independent and dependent variable
Answer:
The indepandent variable is wether its hot or cold water, so the tempurature of the water. The dependant variable is how much sugar disolves.
Explanation:
The indepandant variable is what changes or has a direct affect on the depandant. The depandant is what is being mesured or tested.
What is 745000 millimeters converted to Megameters?
Answer:
0.000745 megameters is the answer please mark me as brainliest
Answer:
Instantly Convert Millimeters (mm) to Megameters (Mm) and Many More Length Conversions Online. Millimeters Conversion Charts. Many Other ...
Missing: 745000× | Must include: 745000
If an atom has 16 protons, 14 neutrons, and 18 electrons. What is the charge of the nucleus?
Answer:
The charge of nucleus will be +2.
Explanation:
Given that,
Proton = 16
Neutron = 14
electron = 18
We know that,
Atomic number :
The number of proton in the nucleus is equal to the atomic number.
The number of protons is equal to the number of electrons for neutral atom.
So, the atomic number is same as the number of electrons.
Here, the number of electron is more than 2 of number of proton.
Hence, The charge of nucleus will be +2.
If an atom has 6 protons and 7 neutrons it will have 7 electrons if it is a neutral atom.
Answer:
NO
Explanation:
To maintain electric neutrality, the atom has to have equal number of electrons and protons. Therefore, it needs to have 6 electrons to be neutral.
pls help
will give the brainliest!
pls answer correctly
Urgent!!!
Answer:
Explanation:
reaction A is an acid base reaction
here MgO is base and H2SO4 is an acid
reaction B is an acid base reaction
here CO3^-² is weak base and H+ is an acid
reaction D is an acid base reaction water is amphoteric in nature here it behave like base and HCL is an acid
reaction F is acid base reaction
here NH3 is an base and HCL is an acid
reaction G is acid base reaction
here NaOH is base and HCL is an acid
in reaction c and e Al is hard acid and Cu is soft acid and HCL is acid and Zn is base but i m not confirmed that these reactions are acid base or not
A chef fills a 100 ml container with 76.5 g of cooking oil. What is the density of the oil? \
The solubility of KNO3 is 32g/100g of water at 20oC and 62g/100g of water at 40oC. What will you observe if a saturated solution of KNO3 at 400C is cooled to 20oC.
Answer:
Explanation:
Solubility of KNO₃ at 20° C = 32 g / 100g of water
that means , per 100 g of water maximum of 32 g of KNO₃ can be dissolved at 20° C .
Solubility of KNO₃ at 40° C = 62 g / 100g of water
that means , per 100 g of water maximum of 62 g of KNO₃ can be dissolved
40° C.
So when a saturated solution in which maximum KNO₃ has been dissolved is cooled from 40° C to 20° C , due to decrease in solubility at lower temperature some KNO₃ will come out of the solution . Per 100 gram of saturated solution , 62 - 32 = 30 g of KNO₃ will precipitate out or come out of water . They can be filtered out .