What happens when red lead oxide is heated?

Answers

Answer 1

Answer: when red leadoxide is heated it gives lead and oxygen i think.

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3. For the following reaction, calculate how many grams of each product are formed when 4.05 gof water is used.
2 H2O → 2 H2 + O2

Answers

Answer:

$\large \boxed{\text{0.453 g of H$_(2)$; 3.60 g of O$_(2)$}}$

Explanation:

We will need a balanced chemical equation with masses and molar masses, so, let's gather all the information in one place.

MM: 2.016 32.00

2H₂O ⟶ 2H₂ + O₂

m/g: 4.05

1. Mass of hydrogen

(a) Moles of H₂O

$\text{Moles of H$_(2)$O} = \text{4.05 g H$_(2)$O}* \frac{\text{1 mol H$_(2)$O}}{\text{18.02 g H$_(2)$O }}= \text{0.2248 mol H$_(2)$O}$

(b) Moles of H₂

$\text{Moles of H$_(2)$} = \text{0.2248 mol H$_(2)$O } * \frac{\text{2 mol H$_(2)$}}{\text{2 mol H$_(2)$O }} = \text{0.2248 mol H$_(2)$}$

(c) Mass of H₂

$\text{Mass of H$_(2)$} =\text{0.2248 mol H$_(2)$} * \frac{\text{2.016 g H$_(2)$}}{\text{1 mol H$_(2)$}} = \textbf{0.453 g H$_(2)$}\n\n\text{The reaction produces $\large \boxed{\textbf{0.453 g}}$ of H$_(2)$}$

2. Mass of oxygen

(a) Moles of O₂

$\text{Moles of O$_(2)$} = \text{0.2248 mol H$_(2)$O } * \frac{\text{1 mol O$_(2)$}}{\text{2 mol H$_(2)$O}} = \text{0.1124 mol O$_(2)$}$

(b) Mass of O₂

$\text{Mass of O$_(2)$} =\text{0.1124 mol O$_(2)$} * \frac{\text{32.00 g O$_(2)$}}{\text{1 mol O$_(2)$}} = \textbf{3.60 g O$_(2)$}\n\n\text{The reaction produces $\large \boxed{\textbf{0.453 g of H$_(2)$ and 3.60 g of O$_(2)$}}$}$

The students who conducted the shadow length experiment concluded that their results concluded that their results supported their hypothesis. Can their supported hypothesis be called a scientific theory? Why or why not?

Answers

Confirmation bias, also called confirmatory bias or myside bias, is the tendency to search for, interpret, favor, and recall information in a way that confirms one's preexisting beliefs or hypotheses, while giving disproportionately less consideration to alternative possibilities.[Note 1][1] It is a type of cognitive bias and a systematic error of inductive reasoning. People display this bias when they gather or remember information selectively, or when they interpret it in a biased way. The effect is stronger for emotionally charged issues and for deeply entrenched beliefs. People also tend to interpret ambiguous evidence as supporting their existing position. Biased search, interpretation and memory have been invoked to explain attitude polarization (when a disagreement becomes more extreme even though the different parties are exposed to the same evidence), belief perseverance (when beliefs persist after the evidence for them is shown to be false), the irrational primacy effect (a greater reliance on information encountered early in a series) and illusory correlation (when people falsely perceive an association between two events or situations).

An unknown material has a mass of 6.75g and a volume of 9 cm3. What is the density of the material? Round to the nearest tenth?

Answers

Answer is: the density of the material is 0.8 g/cm³.

m(material) = 6.75 g; mass of unknown material.

V(material) = 9 cm³; volume of unknown material.

d(material) = m(material) ÷ V(material).

d(material) = 6.75 g ÷ 9 cm³.

d(material) = 0.75 g/cm³; density of unknown material.

What do chemical compound and mixture have in common

Answers

Compounds and mixtures are both made up of one or more elements.

Compound and Mixture also have Homogeneous Composition

24 POINTS!!!!!!!!!!!!!!!!!!Sarah, who has a mass of 55 kg, is riding in a car at 20 m/s. She sees a cat crossing the street and slams on the brakes! Her seatbelt stops her from flying forward, bringing her to rest in 0.5 seconds. How much force did the seatbelt put on Sarah?

Answers

F = (mass)(acceleration) = ma

m = 55 kg

Vi = 20 m/s

t = 0.5 s

Vf = 0 m/s (since she was put to rest)

a=(Vf-Vi)/t

a=(0-20)/5

a = 40 m/s^2 (decelerating)

F = ma = (55 kg)(40 m/s^2)

F = 2200 N

Hope this answer will be a good help for you.

change of momentum =mv-mu=m(v-u)=55(0-20)=-1100
rate of change of momentum=-1100/0.5=-2200 this is equal to force applied.
so force=-2200 kg/m^2
negative sign shows force acts in opposite direction to motion.

There are many sources of air pollution in the united states and around the world. Some are natural sources, and other come from human activities. Which of these examples is a natural source of air pollution?A.) car exhaust fumes
B.) methane gas from cow manure
C.) dust from fertilizers used on crops
D.) smoke from the burning of fossil fuels

Answers

B should be your best guess

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